dr_wav.h

// WAV audio loader and writer. Public domain. See "unlicense" statement at the end of this file.
// dr_wav - v0.7f - 2018-02-05
//
// David Reid - mackron@gmail.com

// USAGE
//
// This is a single-file library. To use it, do something like the following in one .c file.
//     #define DR_WAV_IMPLEMENTATION
//     #include "dr_wav.h"
//
// You can then #include this file in other parts of the program as you would with any other header file. Do something
// like the following to read audio data:
//
//     drwav wav;
//     if (!drwav_init_file(&wav, "my_song.wav")) {
//         // Error opening WAV file.
//     }
//
//     drwav_int32* pDecodedInterleavedSamples = malloc(wav.totalSampleCount * sizeof(drwav_int32));
//     size_t numberOfSamplesActuallyDecoded = drwav_read_s32(&wav, wav.totalSampleCount, pDecodedInterleavedSamples);
//
//     ...
//
//     drwav_uninit(&wav);
//
// You can also use drwav_open() to allocate and initialize the loader for you:
//
//     drwav* pWav = drwav_open_file("my_song.wav");
//     if (pWav == NULL) {
//         // Error opening WAV file.
//     }
//
//     ...
//
//     drwav_close(pWav);
//
// If you just want to quickly open and read the audio data in a single operation you can do something like this:
//
//     unsigned int channels;
//     unsigned int sampleRate;
//     drwav_uint64 totalSampleCount;
//     float* pSampleData = drwav_open_and_read_file_s32("my_song.wav", &channels, &sampleRate, &totalSampleCount);
//     if (pSampleData == NULL) {
//         // Error opening and reading WAV file.
//     }
//
//     ...
//
//     drwav_free(pSampleData);
//
// The examples above use versions of the API that convert the audio data to a consistent format (32-bit signed PCM, in
// this case), but you can still output the audio data in it's internal format (see notes below for supported formats):
//
//     size_t samplesRead = drwav_read(&wav, wav.totalSampleCount, pDecodedInterleavedSamples);
//
// You can also read the raw bytes of audio data, which could be useful if dr_wav does not have native support for
// a particular data format:
//
//     size_t bytesRead = drwav_read_raw(&wav, bytesToRead, pRawDataBuffer);
//
//
// dr_wav has seamless support the Sony Wave64 format. The decoder will automatically detect it and it should Just Work
// without any manual intervention.
//
//
// dr_wav can also be used to output WAV files. This does not currently support compressed formats. To use this, look at
// drwav_open_write(), drwav_open_file_write(), etc. Use drwav_write() to write samples, or drwav_write_raw() to write
// raw data in the "data" chunk.
//
//     drwav_data_format format;
//     format.container = drwav_container_riff;     // <-- drwav_container_riff = normal WAV files, drwav_container_w64 = Sony Wave64.
//     format.format = DR_WAVE_FORMAT_PCM;          // <-- Any of the DR_WAVE_FORMAT_* codes.
//     format.channels = 2;
//     format.sampleRate = 44100;
//     format.bitsPerSample = 16;
//     drwav* pWav = drwav_open_file_write("data/recording.wav", &format);
//
//     ...
//
//     drwav_uint64 samplesWritten = drwav_write(pWav, sampleCount, pSamples);
//
//
//
// OPTIONS
// #define these options before including this file.
//
// #define DR_WAV_NO_CONVERSION_API
//   Disables conversion APIs such as drwav_read_f32() and drwav_s16_to_f32().
//
// #define DR_WAV_NO_STDIO
//   Disables drwav_open_file(), drwav_open_file_write(), etc.
//
//
//
// QUICK NOTES
// - Samples are always interleaved.
// - The default read function does not do any data conversion. Use drwav_read_f32() to read and convert audio data
//   to IEEE 32-bit floating point samples, drwav_read_s32() to read samples as signed 32-bit PCM and drwav_read_s16()
//   to read samples as signed 16-bit PCM. Tested and supported internal formats include the following:
//   - Unsigned 8-bit PCM
//   - Signed 12-bit PCM
//   - Signed 16-bit PCM
//   - Signed 24-bit PCM
//   - Signed 32-bit PCM
//   - IEEE 32-bit floating point
//   - IEEE 64-bit floating point
//   - A-law and u-law
//   - Microsoft ADPCM
//   - IMA ADPCM (DVI, format code 0x11)
// - dr_wav will try to read the WAV file as best it can, even if it's not strictly conformant to the WAV format.


#ifndef dr_wav_h
#define dr_wav_h

#include <stddef.h>

#if defined(_MSC_VER) && _MSC_VER < 1600
typedef   signed char    drwav_int8;
typedef unsigned char    drwav_uint8;
typedef   signed short   drwav_int16;
typedef unsigned short   drwav_uint16;
typedef   signed int     drwav_int32;
typedef unsigned int     drwav_uint32;
typedef   signed __int64 drwav_int64;
typedef unsigned __int64 drwav_uint64;
#else
#include <stdint.h>
typedef int8_t           drwav_int8;
typedef uint8_t          drwav_uint8;
typedef int16_t          drwav_int16;
typedef uint16_t         drwav_uint16;
typedef int32_t          drwav_int32;
typedef uint32_t         drwav_uint32;
typedef int64_t          drwav_int64;
typedef uint64_t         drwav_uint64;
#endif
typedef drwav_uint8      drwav_bool8;
typedef drwav_uint32     drwav_bool32;
#define DRWAV_TRUE       1
#define DRWAV_FALSE      0

#ifdef __cplusplus
extern "C" {
#endif

// Common data formats.
#define DR_WAVE_FORMAT_PCM          0x1
#define DR_WAVE_FORMAT_ADPCM        0x2
#define DR_WAVE_FORMAT_IEEE_FLOAT   0x3
#define DR_WAVE_FORMAT_ALAW         0x6
#define DR_WAVE_FORMAT_MULAW        0x7
#define DR_WAVE_FORMAT_DVI_ADPCM    0x11
#define DR_WAVE_FORMAT_EXTENSIBLE   0xFFFE

typedef enum
{
    drwav_seek_origin_start,
    drwav_seek_origin_current
} drwav_seek_origin;

typedef enum
{
    drwav_container_riff,
    drwav_container_w64
} drwav_container;

// Callback for when data is read. Return value is the number of bytes actually read.
//
// pUserData   [in]  The user data that was passed to drwav_init(), drwav_open() and family.
// pBufferOut  [out] The output buffer.
// bytesToRead [in]  The number of bytes to read.
//
// Returns the number of bytes actually read.
//
// A return value of less than bytesToRead indicates the end of the stream. Do _not_ return from this callback until
// either the entire bytesToRead is filled or you have reached the end of the stream.
typedef size_t (* drwav_read_proc)(void* pUserData, void* pBufferOut, size_t bytesToRead);

// Callback for when data is written. Returns value is the number of bytes actually written.
//
// pUserData    [in]  The user data that was passed to drwav_init_write(), drwav_open_write() and family.
// pData        [out] A pointer to the data to write.
// bytesToWrite [in]  The number of bytes to write.
//
// Returns the number of bytes actually written.
//
// If the return value differs from bytesToWrite, it indicates an error.
typedef size_t (* drwav_write_proc)(void* pUserData, const void* pData, size_t bytesToWrite);

// Callback for when data needs to be seeked.
//
// pUserData [in] The user data that was passed to drwav_init(), drwav_open() and family.
// offset    [in] The number of bytes to move, relative to the origin. Will never be negative.
// origin    [in] The origin of the seek - the current position or the start of the stream.
//
// Returns whether or not the seek was successful.
//
// Whether or not it is relative to the beginning or current position is determined by the "origin" parameter which
// will be either drwav_seek_origin_start or drwav_seek_origin_current.
typedef drwav_bool32 (* drwav_seek_proc)(void* pUserData, int offset, drwav_seek_origin origin);

// Structure for internal use. Only used for loaders opened with drwav_open_memory().
typedef struct
{
    const drwav_uint8* data;
    size_t dataSize;
    size_t currentReadPos;
} drwav__memory_stream;

// Structure for internal use. Only used for writers opened with drwav_open_memory_write().
typedef struct
{
    void** ppData;
    size_t* pDataSize;
    size_t dataSize;
    size_t dataCapacity;
    size_t currentWritePos;
} drwav__memory_stream_write;

typedef struct
{
    drwav_container container;  // RIFF, W64.
    drwav_uint32 format;        // DR_WAVE_FORMAT_*
    drwav_uint32 channels;
    drwav_uint32 sampleRate;
    drwav_uint32 bitsPerSample;
} drwav_data_format;

typedef struct
{
    // The format tag exactly as specified in the wave file's "fmt" chunk. This can be used by applications
    // that require support for data formats not natively supported by dr_wav.
    drwav_uint16 formatTag;

    // The number of channels making up the audio data. When this is set to 1 it is mono, 2 is stereo, etc.
    drwav_uint16 channels;

    // The sample rate. Usually set to something like 44100.
    drwav_uint32 sampleRate;

    // Average bytes per second. You probably don't need this, but it's left here for informational purposes.
    drwav_uint32 avgBytesPerSec;

    // Block align. This is equal to the number of channels * bytes per sample.
    drwav_uint16 blockAlign;

    // Bit's per sample.
    drwav_uint16 bitsPerSample;

    // The size of the extended data. Only used internally for validation, but left here for informational purposes.
    drwav_uint16 extendedSize;

    // The number of valid bits per sample. When <formatTag> is equal to WAVE_FORMAT_EXTENSIBLE, <bitsPerSample>
    // is always rounded up to the nearest multiple of 8. This variable contains information about exactly how
    // many bits a valid per sample. Mainly used for informational purposes.
    drwav_uint16 validBitsPerSample;

    // The channel mask. Not used at the moment.
    drwav_uint32 channelMask;

    // The sub-format, exactly as specified by the wave file.
    drwav_uint8 subFormat[16];
} drwav_fmt;

typedef struct
{
    // A pointer to the function to call when more data is needed.
    drwav_read_proc onRead;

    // A pointer to the function to call when data needs to be written. Only used when the drwav object is opened in write mode.
    drwav_write_proc onWrite;

    // A pointer to the function to call when the wav file needs to be seeked.
    drwav_seek_proc onSeek;

    // The user data to pass to callbacks.
    void* pUserData;


    // Whether or not the WAV file is formatted as a standard RIFF file or W64.
    drwav_container container;


    // Structure containing format information exactly as specified by the wav file.
    drwav_fmt fmt;

    // The sample rate. Will be set to something like 44100.
    drwav_uint32 sampleRate;

    // The number of channels. This will be set to 1 for monaural streams, 2 for stereo, etc.
    drwav_uint16 channels;

    // The bits per sample. Will be set to somthing like 16, 24, etc.
    drwav_uint16 bitsPerSample;

    // The number of bytes per sample.
    drwav_uint16 bytesPerSample;

    // Equal to fmt.formatTag, or the value specified by fmt.subFormat if fmt.formatTag is equal to 65534 (WAVE_FORMAT_EXTENSIBLE).
    drwav_uint16 translatedFormatTag;

    // The total number of samples making up the audio data. Use <totalSampleCount> * <bytesPerSample> to calculate
    // the required size of a buffer to hold the entire audio data.
    drwav_uint64 totalSampleCount;


    // The size in bytes of the data chunk.
    drwav_uint64 dataChunkDataSize;
    
    // The position in the stream of the first byte of the data chunk. This is used for seeking.
    drwav_uint64 dataChunkDataPos;

    // The number of bytes remaining in the data chunk.
    drwav_uint64 bytesRemaining;


    // A hack to avoid a DRWAV_MALLOC() when opening a decoder with drwav_open_memory().
    drwav__memory_stream memoryStream;
    drwav__memory_stream_write memoryStreamWrite;

    // Generic data for compressed formats. This data is shared across all block-compressed formats.
    struct
    {
        drwav_uint64 iCurrentSample;    // The index of the next sample that will be read by drwav_read_*(). This is used with "totalSampleCount" to ensure we don't read excess samples at the end of the last block.
    } compressed;
    
    // Microsoft ADPCM specific data.
    struct
    {
        drwav_uint32 bytesRemainingInBlock;
        drwav_uint16 predictor[2];
        drwav_int32  delta[2];
        drwav_int32  cachedSamples[4];  // Samples are stored in this cache during decoding.
        drwav_uint32 cachedSampleCount;
        drwav_int32  prevSamples[2][2]; // The previous 2 samples for each channel (2 channels at most).
    } msadpcm;

    // IMA ADPCM specific data.
    struct
    {
        drwav_uint32 bytesRemainingInBlock;
        drwav_int32  predictor[2];
        drwav_int32  stepIndex[2];
        drwav_int32  cachedSamples[16]; // Samples are stored in this cache during decoding.
        drwav_uint32 cachedSampleCount;
    } ima;
} drwav;


// Initializes a pre-allocated drwav object.
//
// onRead    [in]           The function to call when data needs to be read from the client.
// onSeek    [in]           The function to call when the read position of the client data needs to move.
// pUserData [in, optional] A pointer to application defined data that will be passed to onRead and onSeek.
//
// Returns true if successful; false otherwise.
//
// Close the loader with drwav_uninit().
//
// This is the lowest level function for initializing a WAV file. You can also use drwav_init_file() and drwav_init_memory()
// to open the stream from a file or from a block of memory respectively.
//
// If you want dr_wav to manage the memory allocation for you, consider using drwav_open() instead. This will allocate
// a drwav object on the heap and return a pointer to it.
//
// See also: drwav_init_file(), drwav_init_memory(), drwav_uninit()
drwav_bool32 drwav_init(drwav* pWav, drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData);

// Initializes a pre-allocated drwav object for writing.
//
// onWrite   [in]           The function to call when data needs to be written.
// onSeek    [in]           The function to call when the write position needs to move.
// pUserData [in, optional] A pointer to application defined data that will be passed to onWrite and onSeek.
//
// Returns true if successful; false otherwise.
//
// Close the writer with drwav_uninit().
//
// This is the lowest level function for initializing a WAV file. You can also use drwav_init_file() and drwav_init_memory()
// to open the stream from a file or from a block of memory respectively.
//
// If you want dr_wav to manage the memory allocation for you, consider using drwav_open() instead. This will allocate
// a drwav object on the heap and return a pointer to it.
//
// See also: drwav_init_file_write(), drwav_init_memory_write(), drwav_uninit()
drwav_bool32 drwav_init_write(drwav* pWav, const drwav_data_format* pFormat, drwav_write_proc onWrite, drwav_seek_proc onSeek, void* pUserData);

// Uninitializes the given drwav object.
//
// Use this only for objects initialized with drwav_init().
void drwav_uninit(drwav* pWav);


// Opens a wav file using the given callbacks.
//
// onRead    [in]           The function to call when data needs to be read from the client.
// onSeek    [in]           The function to call when the read position of the client data needs to move.
// pUserData [in, optional] A pointer to application defined data that will be passed to onRead and onSeek.
//
// Returns null on error.
//
// Close the loader with drwav_close().
//
// This is the lowest level function for opening a WAV file. You can also use drwav_open_file() and drwav_open_memory()
// to open the stream from a file or from a block of memory respectively.
//
// This is different from drwav_init() in that it will allocate the drwav object for you via DRWAV_MALLOC() before
// initializing it.
//
// See also: drwav_open_file(), drwav_open_memory(), drwav_close()
drwav* drwav_open(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData);

// Opens a wav file for writing using the given callbacks.
//
// onWrite   [in]           The function to call when data needs to be written.
// onSeek    [in]           The function to call when the write position needs to move.
// pUserData [in, optional] A pointer to application defined data that will be passed to onWrite and onSeek.
//
// Returns null on error.
//
// Close the loader with drwav_close().
//
// This is the lowest level function for opening a WAV file. You can also use drwav_open_file_write() and drwav_open_memory_write()
// to open the stream from a file or from a block of memory respectively.
//
// This is different from drwav_init_write() in that it will allocate the drwav object for you via DRWAV_MALLOC() before
// initializing it.
//
// See also: drwav_open_file_write(), drwav_open_memory_write(), drwav_close()
drwav* drwav_open_write(const drwav_data_format* pFormat, drwav_write_proc onWrite, drwav_seek_proc onSeek, void* pUserData);

// Uninitializes and deletes the the given drwav object.
//
// Use this only for objects created with drwav_open().
void drwav_close(drwav* pWav);


// Reads raw audio data.
//
// This is the lowest level function for reading audio data. It simply reads the given number of
// bytes of the raw internal sample data.
//
// Consider using drwav_read_s16(), drwav_read_s32() or drwav_read_f32() for reading sample data in
// a consistent format.
//
// Returns the number of bytes actually read.
size_t drwav_read_raw(drwav* pWav, size_t bytesToRead, void* pBufferOut);

// Reads a chunk of audio data in the native internal format.
//
// This is typically the most efficient way to retrieve audio data, but it does not do any format
// conversions which means you'll need to convert the data manually if required.
//
// If the return value is less than <samplesToRead> it means the end of the file has been reached or
// you have requested more samples than can possibly fit in the output buffer.
//
// This function will only work when sample data is of a fixed size and uncompressed. If you are
// using a compressed format consider using drwav_read_raw() or drwav_read_s16/s32/f32/etc().
drwav_uint64 drwav_read(drwav* pWav, drwav_uint64 samplesToRead, void* pBufferOut);

// Seeks to the given sample.
//
// Returns true if successful; false otherwise.
drwav_bool32 drwav_seek_to_sample(drwav* pWav, drwav_uint64 sample);


// Writes raw audio data.
//
// Returns the number of bytes actually written. If this differs from bytesToWrite, it indicates an error.
size_t drwav_write_raw(drwav* pWav, size_t bytesToWrite, const void* pData);

// Writes audio data based on sample counts.
//
// Returns the number of samples written.
drwav_uint64 drwav_write(drwav* pWav, drwav_uint64 samplesToWrite, const void* pData);



//// Convertion Utilities ////
#ifndef DR_WAV_NO_CONVERSION_API

// Reads a chunk of audio data and converts it to signed 16-bit PCM samples.
//
// Returns the number of samples actually read.
//
// If the return value is less than <samplesToRead> it means the end of the file has been reached.
drwav_uint64 drwav_read_s16(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut);

// Low-level function for converting unsigned 8-bit PCM samples to signed 16-bit PCM samples.
void drwav_u8_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting signed 24-bit PCM samples to signed 16-bit PCM samples.
void drwav_s24_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting signed 32-bit PCM samples to signed 16-bit PCM samples.
void drwav_s32_to_s16(drwav_int16* pOut, const drwav_int32* pIn, size_t sampleCount);

// Low-level function for converting IEEE 32-bit floating point samples to signed 16-bit PCM samples.
void drwav_f32_to_s16(drwav_int16* pOut, const float* pIn, size_t sampleCount);

// Low-level function for converting IEEE 64-bit floating point samples to signed 16-bit PCM samples.
void drwav_f64_to_s16(drwav_int16* pOut, const double* pIn, size_t sampleCount);

// Low-level function for converting A-law samples to signed 16-bit PCM samples.
void drwav_alaw_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting u-law samples to signed 16-bit PCM samples.
void drwav_mulaw_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount);


// Reads a chunk of audio data and converts it to IEEE 32-bit floating point samples.
//
// Returns the number of samples actually read.
//
// If the return value is less than <samplesToRead> it means the end of the file has been reached.
drwav_uint64 drwav_read_f32(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut);

// Low-level function for converting unsigned 8-bit PCM samples to IEEE 32-bit floating point samples.
void drwav_u8_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting signed 16-bit PCM samples to IEEE 32-bit floating point samples.
void drwav_s16_to_f32(float* pOut, const drwav_int16* pIn, size_t sampleCount);

// Low-level function for converting signed 24-bit PCM samples to IEEE 32-bit floating point samples.
void drwav_s24_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting signed 32-bit PCM samples to IEEE 32-bit floating point samples.
void drwav_s32_to_f32(float* pOut, const drwav_int32* pIn, size_t sampleCount);

// Low-level function for converting IEEE 64-bit floating point samples to IEEE 32-bit floating point samples.
void drwav_f64_to_f32(float* pOut, const double* pIn, size_t sampleCount);

// Low-level function for converting A-law samples to IEEE 32-bit floating point samples.
void drwav_alaw_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting u-law samples to IEEE 32-bit floating point samples.
void drwav_mulaw_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount);


// Reads a chunk of audio data and converts it to signed 32-bit PCM samples.
//
// Returns the number of samples actually read.
//
// If the return value is less than <samplesToRead> it means the end of the file has been reached.
drwav_uint64 drwav_read_s32(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut);

// Low-level function for converting unsigned 8-bit PCM samples to signed 32-bit PCM samples.
void drwav_u8_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting signed 16-bit PCM samples to signed 32-bit PCM samples.
void drwav_s16_to_s32(drwav_int32* pOut, const drwav_int16* pIn, size_t sampleCount);

// Low-level function for converting signed 24-bit PCM samples to signed 32-bit PCM samples.
void drwav_s24_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting IEEE 32-bit floating point samples to signed 32-bit PCM samples.
void drwav_f32_to_s32(drwav_int32* pOut, const float* pIn, size_t sampleCount);

// Low-level function for converting IEEE 64-bit floating point samples to signed 32-bit PCM samples.
void drwav_f64_to_s32(drwav_int32* pOut, const double* pIn, size_t sampleCount);

// Low-level function for converting A-law samples to signed 32-bit PCM samples.
void drwav_alaw_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount);

// Low-level function for converting u-law samples to signed 32-bit PCM samples.
void drwav_mulaw_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount);

#endif  //DR_WAV_NO_CONVERSION_API


//// High-Level Convenience Helpers ////

#ifndef DR_WAV_NO_STDIO

// Helper for initializing a wave file using stdio.
//
// This holds the internal FILE object until drwav_uninit() is called. Keep this in mind if you're caching drwav
// objects because the operating system may restrict the number of file handles an application can have open at
// any given time.
drwav_bool32 drwav_init_file(drwav* pWav, const char* filename);

// Helper for initializing a wave file for writing using stdio.
//
// This holds the internal FILE object until drwav_uninit() is called. Keep this in mind if you're caching drwav
// objects because the operating system may restrict the number of file handles an application can have open at
// any given time.
drwav_bool32 drwav_init_file_write(drwav* pWav, const char* filename, const drwav_data_format* pFormat);

// Helper for opening a wave file using stdio.
//
// This holds the internal FILE object until drwav_close() is called. Keep this in mind if you're caching drwav
// objects because the operating system may restrict the number of file handles an application can have open at
// any given time.
drwav* drwav_open_file(const char* filename);

// Helper for opening a wave file for writing using stdio.
//
// This holds the internal FILE object until drwav_close() is called. Keep this in mind if you're caching drwav
// objects because the operating system may restrict the number of file handles an application can have open at
// any given time.
drwav* drwav_open_file_write(const char* filename, const drwav_data_format* pFormat);

#endif  //DR_WAV_NO_STDIO

// Helper for initializing a loader from a pre-allocated memory buffer.
//
// This does not create a copy of the data. It is up to the application to ensure the buffer remains valid for
// the lifetime of the drwav object.
//
// The buffer should contain the contents of the entire wave file, not just the sample data.
drwav_bool32 drwav_init_memory(drwav* pWav, const void* data, size_t dataSize);

// Helper for initializing a writer which outputs data to a memory buffer.
//
// dr_wav will manage the memory allocations, however it is up to the caller to free the data with drwav_free().
//
// The buffer will remain allocated even after drwav_uninit() is called. Indeed, the buffer should not be
// considered valid until after drwav_uninit() has been called anyway.
drwav_bool32 drwav_init_memory_write(drwav* pWav, void** ppData, size_t* pDataSize, const drwav_data_format* pFormat);

// Helper for opening a loader from a pre-allocated memory buffer.
//
// This does not create a copy of the data. It is up to the application to ensure the buffer remains valid for
// the lifetime of the drwav object.
//
// The buffer should contain the contents of the entire wave file, not just the sample data.
drwav* drwav_open_memory(const void* data, size_t dataSize);

// Helper for opening a writer which outputs data to a memory buffer.
//
// dr_wav will manage the memory allocations, however it is up to the caller to free the data with drwav_free().
//
// The buffer will remain allocated even after drwav_close() is called. Indeed, the buffer should not be
// considered valid until after drwav_close() has been called anyway.
drwav* drwav_open_memory_write(void** ppData, size_t* pDataSize, const drwav_data_format* pFormat);


#ifndef DR_WAV_NO_CONVERSION_API
// Opens and reads a wav file in a single operation.
drwav_int16* drwav_open_and_read_s16(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
float* drwav_open_and_read_f32(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
drwav_int32* drwav_open_and_read_s32(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
#ifndef DR_WAV_NO_STDIO
// Opens and decodes a wav file in a single operation.
drwav_int16* drwav_open_and_read_file_s16(const char* filename, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
float* drwav_open_and_read_file_f32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
drwav_int32* drwav_open_and_read_file_s32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
#endif

// Opens and decodes a wav file from a block of memory in a single operation.
drwav_int16* drwav_open_and_read_memory_s16(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
float* drwav_open_and_read_memory_f32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
drwav_int32* drwav_open_and_read_memory_s32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount);
#endif

// Frees data that was allocated internally by dr_wav.
void drwav_free(void* pDataReturnedByOpenAndRead);

#ifdef __cplusplus
}
#endif
#endif  // dr_wav_h


/////////////////////////////////////////////////////
//
// IMPLEMENTATION
//
/////////////////////////////////////////////////////

#ifdef DR_WAV_IMPLEMENTATION
#include <stdlib.h>
#include <string.h> // For memcpy(), memset()
#include <limits.h> // For INT_MAX

#ifndef DR_WAV_NO_STDIO
#include <stdio.h>
#endif

// Standard library stuff.
#ifndef DRWAV_ASSERT
#include <assert.h>
#define DRWAV_ASSERT(expression)           assert(expression)
#endif
#ifndef DRWAV_MALLOC
#define DRWAV_MALLOC(sz)                   malloc((sz))
#endif
#ifndef DRWAV_REALLOC
#define DRWAV_REALLOC(p, sz)               realloc((p), (sz))
#endif
#ifndef DRWAV_FREE
#define DRWAV_FREE(p)                      free((p))
#endif
#ifndef DRWAV_COPY_MEMORY
#define DRWAV_COPY_MEMORY(dst, src, sz)    memcpy((dst), (src), (sz))
#endif
#ifndef DRWAV_ZERO_MEMORY
#define DRWAV_ZERO_MEMORY(p, sz)           memset((p), 0, (sz))
#endif

#define drwav_countof(x)                   (sizeof(x) / sizeof(x[0]))
#define drwav_align(x, a)                  ((((x) + (a) - 1) / (a)) * (a))
#define drwav_min(a, b)                    (((a) < (b)) ? (a) : (b))
#define drwav_max(a, b)                    (((a) > (b)) ? (a) : (b))
#define drwav_clamp(x, lo, hi)             (drwav_max((lo), drwav_min((hi), (x))))

#define drwav_assert                       DRWAV_ASSERT
#define drwav_copy_memory                  DRWAV_COPY_MEMORY
#define drwav_zero_memory                  DRWAV_ZERO_MEMORY


#define DRWAV_MAX_SIMD_VECTOR_SIZE         64  // 64 for AVX-512 in the future.

#ifdef _MSC_VER
#define DRWAV_INLINE __forceinline
#else
#ifdef __GNUC__
#define DRWAV_INLINE inline __attribute__((always_inline))
#else
#define DRWAV_INLINE inline
#endif
#endif

// I couldn't figure out where SIZE_MAX was defined for VC6. If anybody knows, let me know.
#if defined(_MSC_VER) && _MSC_VER <= 1200
    #if defined(_WIN64)
        #define SIZE_MAX    ((drwav_uint64)0xFFFFFFFFFFFFFFFF)
    #else
        #define SIZE_MAX    0xFFFFFFFF
    #endif
#endif

static const drwav_uint8 drwavGUID_W64_RIFF[16] = {0x72,0x69,0x66,0x66, 0x2E,0x91, 0xCF,0x11, 0xA5,0xD6, 0x28,0xDB,0x04,0xC1,0x00,0x00};    // 66666972-912E-11CF-A5D6-28DB04C10000
static const drwav_uint8 drwavGUID_W64_WAVE[16] = {0x77,0x61,0x76,0x65, 0xF3,0xAC, 0xD3,0x11, 0x8C,0xD1, 0x00,0xC0,0x4F,0x8E,0xDB,0x8A};    // 65766177-ACF3-11D3-8CD1-00C04F8EDB8A
static const drwav_uint8 drwavGUID_W64_JUNK[16] = {0x6A,0x75,0x6E,0x6B, 0xF3,0xAC, 0xD3,0x11, 0x8C,0xD1, 0x00,0xC0,0x4F,0x8E,0xDB,0x8A};    // 6B6E756A-ACF3-11D3-8CD1-00C04F8EDB8A
static const drwav_uint8 drwavGUID_W64_FMT [16] = {0x66,0x6D,0x74,0x20, 0xF3,0xAC, 0xD3,0x11, 0x8C,0xD1, 0x00,0xC0,0x4F,0x8E,0xDB,0x8A};    // 20746D66-ACF3-11D3-8CD1-00C04F8EDB8A
static const drwav_uint8 drwavGUID_W64_FACT[16] = {0x66,0x61,0x63,0x74, 0xF3,0xAC, 0xD3,0x11, 0x8C,0xD1, 0x00,0xC0,0x4F,0x8E,0xDB,0x8A};    // 74636166-ACF3-11D3-8CD1-00C04F8EDB8A
static const drwav_uint8 drwavGUID_W64_DATA[16] = {0x64,0x61,0x74,0x61, 0xF3,0xAC, 0xD3,0x11, 0x8C,0xD1, 0x00,0xC0,0x4F,0x8E,0xDB,0x8A};    // 61746164-ACF3-11D3-8CD1-00C04F8EDB8A

static DRWAV_INLINE drwav_bool32 drwav__guid_equal(const drwav_uint8 a[16], const drwav_uint8 b[16])
{
    const drwav_uint32* a32 = (const drwav_uint32*)a;
    const drwav_uint32* b32 = (const drwav_uint32*)b;

    return
        a32[0] == b32[0] &&
        a32[1] == b32[1] &&
        a32[2] == b32[2] &&
        a32[3] == b32[3];
}

static DRWAV_INLINE drwav_bool32 drwav__fourcc_equal(const unsigned char* a, const char* b)
{
    return
        a[0] == b[0] &&
        a[1] == b[1] &&
        a[2] == b[2] &&
        a[3] == b[3];
}



static DRWAV_INLINE int drwav__is_little_endian()
{
    int n = 1;
    return (*(char*)&n) == 1;
}

static DRWAV_INLINE unsigned short drwav__bytes_to_u16(const unsigned char* data)
{
    if (drwav__is_little_endian()) {
        return (data[0] << 0) | (data[1] << 8);
    } else {
        return (data[1] << 0) | (data[0] << 8);
    }
}

static DRWAV_INLINE short drwav__bytes_to_s16(const unsigned char* data)
{
    return (short)drwav__bytes_to_u16(data);
}

static DRWAV_INLINE unsigned int drwav__bytes_to_u32(const unsigned char* data)
{
    if (drwav__is_little_endian()) {
        return (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
    } else {
        return (data[3] << 0) | (data[2] << 8) | (data[1] << 16) | (data[0] << 24);
    }
}

static DRWAV_INLINE drwav_uint64 drwav__bytes_to_u64(const unsigned char* data)
{
    if (drwav__is_little_endian()) {
        return
            ((drwav_uint64)data[0] <<  0) | ((drwav_uint64)data[1] <<  8) | ((drwav_uint64)data[2] << 16) | ((drwav_uint64)data[3] << 24) |
            ((drwav_uint64)data[4] << 32) | ((drwav_uint64)data[5] << 40) | ((drwav_uint64)data[6] << 48) | ((drwav_uint64)data[7] << 56);
    } else {
        return
            ((drwav_uint64)data[7] <<  0) | ((drwav_uint64)data[6] <<  8) | ((drwav_uint64)data[5] << 16) | ((drwav_uint64)data[4] << 24) |
            ((drwav_uint64)data[3] << 32) | ((drwav_uint64)data[2] << 40) | ((drwav_uint64)data[1] << 48) | ((drwav_uint64)data[0] << 56);
    }
}

static DRWAV_INLINE void drwav__bytes_to_guid(const unsigned char* data, drwav_uint8* guid)
{
    for (int i = 0; i < 16; ++i) {
        guid[i] = data[i];
    }
}


static DRWAV_INLINE drwav_bool32 drwav__is_compressed_format_tag(drwav_uint16 formatTag)
{
    return
        formatTag == DR_WAVE_FORMAT_ADPCM ||
        formatTag == DR_WAVE_FORMAT_DVI_ADPCM;
}


drwav_uint64 drwav_read_s16__msadpcm(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut);
drwav_uint64 drwav_read_s16__ima(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut);

typedef struct
{
    union
    {
        drwav_uint8 fourcc[4];
        drwav_uint8 guid[16];
    } id;

    // The size in bytes of the chunk.
    drwav_uint64 sizeInBytes;

    // RIFF = 2 byte alignment.
    // W64  = 8 byte alignment.
    unsigned int paddingSize;

} drwav__chunk_header;

static drwav_bool32 drwav__read_chunk_header(drwav_read_proc onRead, void* pUserData, drwav_container container, drwav_uint64* pRunningBytesReadOut, drwav__chunk_header* pHeaderOut)
{
    if (container == drwav_container_riff) {
        if (onRead(pUserData, pHeaderOut->id.fourcc, 4) != 4) {
            return DRWAV_FALSE;
        }

        unsigned char sizeInBytes[4];
        if (onRead(pUserData, sizeInBytes, 4) != 4) {
            return DRWAV_FALSE;
        }

        pHeaderOut->sizeInBytes = drwav__bytes_to_u32(sizeInBytes);
        pHeaderOut->paddingSize = (unsigned int)(pHeaderOut->sizeInBytes % 2);
        *pRunningBytesReadOut += 8;
    } else {
        if (onRead(pUserData, pHeaderOut->id.guid, 16) != 16) {
            return DRWAV_FALSE;
        }

        unsigned char sizeInBytes[8];
        if (onRead(pUserData, sizeInBytes, 8) != 8) {
            return DRWAV_FALSE;
        }

        pHeaderOut->sizeInBytes = drwav__bytes_to_u64(sizeInBytes) - 24;    // <-- Subtract 24 because w64 includes the size of the header.
        pHeaderOut->paddingSize = (unsigned int)(pHeaderOut->sizeInBytes % 8);
        pRunningBytesReadOut += 24;
    }

    return DRWAV_TRUE;
}

static drwav_bool32 drwav__seek_forward(drwav_seek_proc onSeek, drwav_uint64 offset, void* pUserData)
{
    drwav_uint64 bytesRemainingToSeek = offset;
    while (bytesRemainingToSeek > 0) {
        if (bytesRemainingToSeek > 0x7FFFFFFF) {
            if (!onSeek(pUserData, 0x7FFFFFFF, drwav_seek_origin_current)) {
                return DRWAV_FALSE;
            }
            bytesRemainingToSeek -= 0x7FFFFFFF;
        } else {
            if (!onSeek(pUserData, (int)bytesRemainingToSeek, drwav_seek_origin_current)) {
                return DRWAV_FALSE;
            }
            bytesRemainingToSeek = 0;
        }
    }

    return DRWAV_TRUE;
}


static drwav_bool32 drwav__read_fmt(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData, drwav_container container, drwav_uint64* pRunningBytesReadOut, drwav_fmt* fmtOut)
{
    drwav__chunk_header header;
    if (!drwav__read_chunk_header(onRead, pUserData, container, pRunningBytesReadOut, &header)) {
        return DRWAV_FALSE;
    }


    // Skip junk chunks.
    if ((container == drwav_container_riff && drwav__fourcc_equal(header.id.fourcc, "JUNK")) || (container == drwav_container_w64 && drwav__guid_equal(header.id.guid, drwavGUID_W64_JUNK))) {
        if (!drwav__seek_forward(onSeek, header.sizeInBytes + header.paddingSize, pUserData)) {
            return DRWAV_FALSE;
        }
        *pRunningBytesReadOut += header.sizeInBytes + header.paddingSize;

        return drwav__read_fmt(onRead, onSeek, pUserData, container, pRunningBytesReadOut, fmtOut);
    }


    // Validation.
    if (container == drwav_container_riff) {
        if (!drwav__fourcc_equal(header.id.fourcc, "fmt ")) {
            return DRWAV_FALSE;
        }
    } else {
        if (!drwav__guid_equal(header.id.guid, drwavGUID_W64_FMT)) {
            return DRWAV_FALSE;
        }
    }


    unsigned char fmt[16];
    if (onRead(pUserData, fmt, sizeof(fmt)) != sizeof(fmt)) {
        return DRWAV_FALSE;
    }
    *pRunningBytesReadOut += sizeof(fmt);

    fmtOut->formatTag      = drwav__bytes_to_u16(fmt + 0);
    fmtOut->channels       = drwav__bytes_to_u16(fmt + 2);
    fmtOut->sampleRate     = drwav__bytes_to_u32(fmt + 4);
    fmtOut->avgBytesPerSec = drwav__bytes_to_u32(fmt + 8);
    fmtOut->blockAlign     = drwav__bytes_to_u16(fmt + 12);
    fmtOut->bitsPerSample  = drwav__bytes_to_u16(fmt + 14);

    fmtOut->extendedSize       = 0;
    fmtOut->validBitsPerSample = 0;
    fmtOut->channelMask        = 0;
    memset(fmtOut->subFormat, 0, sizeof(fmtOut->subFormat));

    if (header.sizeInBytes > 16) {
        unsigned char fmt_cbSize[2];
        if (onRead(pUserData, fmt_cbSize, sizeof(fmt_cbSize)) != sizeof(fmt_cbSize)) {
            return DRWAV_FALSE;    // Expecting more data.
        }
        *pRunningBytesReadOut += sizeof(fmt_cbSize);

        int bytesReadSoFar = 18;

        fmtOut->extendedSize = drwav__bytes_to_u16(fmt_cbSize);
        if (fmtOut->extendedSize > 0) {
            // Simple validation.
            if (fmtOut->formatTag == DR_WAVE_FORMAT_EXTENSIBLE) {
                if (fmtOut->extendedSize != 22) {
                    return DRWAV_FALSE;
                }
            }

            if (fmtOut->formatTag == DR_WAVE_FORMAT_EXTENSIBLE) {
                unsigned char fmtext[22];
                if (onRead(pUserData, fmtext, fmtOut->extendedSize) != fmtOut->extendedSize) {
                    return DRWAV_FALSE;    // Expecting more data.
                }

                fmtOut->validBitsPerSample = drwav__bytes_to_u16(fmtext + 0);
                fmtOut->channelMask        = drwav__bytes_to_u32(fmtext + 2);
                drwav__bytes_to_guid(fmtext + 6, fmtOut->subFormat);
            } else {
                if (!onSeek(pUserData, fmtOut->extendedSize, drwav_seek_origin_current)) {
                    return DRWAV_FALSE;
                }
            }
            *pRunningBytesReadOut += fmtOut->extendedSize;

            bytesReadSoFar += fmtOut->extendedSize;
        }

        // Seek past any leftover bytes. For w64 the leftover will be defined based on the chunk size.
        if (!onSeek(pUserData, (int)(header.sizeInBytes - bytesReadSoFar), drwav_seek_origin_current)) {
            return DRWAV_FALSE;
        }
        *pRunningBytesReadOut += (header.sizeInBytes - bytesReadSoFar);
    }

    if (header.paddingSize > 0) {
        if (!onSeek(pUserData, header.paddingSize, drwav_seek_origin_current)) {
            return DRWAV_FALSE;
        }
        *pRunningBytesReadOut += header.paddingSize;
    }

    return DRWAV_TRUE;
}


#ifndef DR_WAV_NO_STDIO
static size_t drwav__on_read_stdio(void* pUserData, void* pBufferOut, size_t bytesToRead)
{
    return fread(pBufferOut, 1, bytesToRead, (FILE*)pUserData);
}

static size_t drwav__on_write_stdio(void* pUserData, const void* pData, size_t bytesToWrite)
{
    return fwrite(pData, 1, bytesToWrite, (FILE*)pUserData);
}

static drwav_bool32 drwav__on_seek_stdio(void* pUserData, int offset, drwav_seek_origin origin)
{
    return fseek((FILE*)pUserData, offset, (origin == drwav_seek_origin_current) ? SEEK_CUR : SEEK_SET) == 0;
}

drwav_bool32 drwav_init_file(drwav* pWav, const char* filename)
{
    FILE* pFile;
#if defined(_MSC_VER) && _MSC_VER >= 1400
    if (fopen_s(&pFile, filename, "rb") != 0) {
        return DRWAV_FALSE;
    }
#else
    pFile = fopen(filename, "rb");
    if (pFile == NULL) {
        return DRWAV_FALSE;
    }
#endif

    return drwav_init(pWav, drwav__on_read_stdio, drwav__on_seek_stdio, (void*)pFile);
}

drwav_bool32 drwav_init_file_write(drwav* pWav, const char* filename, const drwav_data_format* pFormat)
{
    FILE* pFile;
#if defined(_MSC_VER) && _MSC_VER >= 1400
    if (fopen_s(&pFile, filename, "wb") != 0) {
        return DRWAV_FALSE;
    }
#else
    pFile = fopen(filename, "wb");
    if (pFile == NULL) {
        return DRWAV_FALSE;
    }
#endif

    return drwav_init_write(pWav, pFormat, drwav__on_write_stdio, drwav__on_seek_stdio, (void*)pFile);
}

drwav* drwav_open_file(const char* filename)
{
    FILE* pFile;
#if defined(_MSC_VER) && _MSC_VER >= 1400
    if (fopen_s(&pFile, filename, "rb") != 0) {
        return NULL;
    }
#else
    pFile = fopen(filename, "rb");
    if (pFile == NULL) {
        return NULL;
    }
#endif

    drwav* pWav = drwav_open(drwav__on_read_stdio, drwav__on_seek_stdio, (void*)pFile);
    if (pWav == NULL) {
        fclose(pFile);
        return NULL;
    }

    return pWav;
}

drwav* drwav_open_file_write(const char* filename, const drwav_data_format* pFormat)
{
    FILE* pFile;
#if defined(_MSC_VER) && _MSC_VER >= 1400
    if (fopen_s(&pFile, filename, "wb") != 0) {
        return NULL;
    }
#else
    pFile = fopen(filename, "wb");
    if (pFile == NULL) {
        return NULL;
    }
#endif

    drwav* pWav = drwav_open_write(pFormat, drwav__on_write_stdio, drwav__on_seek_stdio, (void*)pFile);
    if (pWav == NULL) {
        fclose(pFile);
        return NULL;
    }

    return pWav;
}
#endif  //DR_WAV_NO_STDIO


static size_t drwav__on_read_memory(void* pUserData, void* pBufferOut, size_t bytesToRead)
{
    drwav__memory_stream* memory = (drwav__memory_stream*)pUserData;
    drwav_assert(memory != NULL);
    drwav_assert(memory->dataSize >= memory->currentReadPos);

    size_t bytesRemaining = memory->dataSize - memory->currentReadPos;
    if (bytesToRead > bytesRemaining) {
        bytesToRead = bytesRemaining;
    }

    if (bytesToRead > 0) {
        DRWAV_COPY_MEMORY(pBufferOut, memory->data + memory->currentReadPos, bytesToRead);
        memory->currentReadPos += bytesToRead;
    }

    return bytesToRead;
}

static drwav_bool32 drwav__on_seek_memory(void* pUserData, int offset, drwav_seek_origin origin)
{
    drwav__memory_stream* memory = (drwav__memory_stream*)pUserData;
    drwav_assert(memory != NULL);

    if (origin == drwav_seek_origin_current) {
        if (offset > 0) {
            if (memory->currentReadPos + offset > memory->dataSize) {
                offset = (int)(memory->dataSize - memory->currentReadPos);  // Trying to seek too far forward.
            }
        } else {
            if (memory->currentReadPos < (size_t)-offset) {
                offset = -(int)memory->currentReadPos;  // Trying to seek too far backwards.
            }
        }

        // This will never underflow thanks to the clamps above.
        memory->currentReadPos += offset;
    } else {
        if ((drwav_uint32)offset <= memory->dataSize) {
            memory->currentReadPos = offset;
        } else {
            memory->currentReadPos = memory->dataSize;  // Trying to seek too far forward.
        }
    }
    
    return DRWAV_TRUE;
}

static size_t drwav__on_write_memory(void* pUserData, const void* pDataIn, size_t bytesToWrite)
{
    drwav__memory_stream_write* memory = (drwav__memory_stream_write*)pUserData;
    drwav_assert(memory != NULL);
    drwav_assert(memory->dataCapacity >= memory->currentWritePos);

    size_t bytesRemaining = memory->dataCapacity - memory->currentWritePos;
    if (bytesRemaining < bytesToWrite) {
        // Need to reallocate.
        size_t newDataCapacity = (memory->dataCapacity == 0) ? 256 : memory->dataCapacity * 2;

        // If doubling wasn't enough, just make it the minimum required size to write the data.
        if ((newDataCapacity - memory->currentWritePos) < bytesToWrite) {
            newDataCapacity = memory->currentWritePos + bytesToWrite;
        }

        void* pNewData = DRWAV_REALLOC(*memory->ppData, newDataCapacity);
        if (pNewData == NULL) {
            return 0;
        }

        *memory->ppData = pNewData;
        memory->dataCapacity = newDataCapacity;
    }

    drwav_uint8* pDataOut = (drwav_uint8*)(*memory->ppData);
    DRWAV_COPY_MEMORY(pDataOut + memory->currentWritePos, pDataIn, bytesToWrite);

    memory->currentWritePos += bytesToWrite;
    if (memory->dataSize < memory->currentWritePos) {
        memory->dataSize = memory->currentWritePos;
    }

    *memory->pDataSize = memory->dataSize;

    return bytesToWrite;
}

static drwav_bool32 drwav__on_seek_memory_write(void* pUserData, int offset, drwav_seek_origin origin)
{
    drwav__memory_stream_write* memory = (drwav__memory_stream_write*)pUserData;
    drwav_assert(memory != NULL);

    if (origin == drwav_seek_origin_current) {
        if (offset > 0) {
            if (memory->currentWritePos + offset > memory->dataSize) {
                offset = (int)(memory->dataSize - memory->currentWritePos);  // Trying to seek too far forward.
            }
        } else {
            if (memory->currentWritePos < (size_t)-offset) {
                offset = -(int)memory->currentWritePos;  // Trying to seek too far backwards.
            }
        }

        // This will never underflow thanks to the clamps above.
        memory->currentWritePos += offset;
    } else {
        if ((drwav_uint32)offset <= memory->dataSize) {
            memory->currentWritePos = offset;
        } else {
            memory->currentWritePos = memory->dataSize;  // Trying to seek too far forward.
        }
    }
    
    return DRWAV_TRUE;
}

drwav_bool32 drwav_init_memory(drwav* pWav, const void* data, size_t dataSize)
{
    if (data == NULL || dataSize == 0) {
        return DRWAV_FALSE;
    }

    drwav__memory_stream memoryStream;
    drwav_zero_memory(&memoryStream, sizeof(memoryStream));
    memoryStream.data = (const unsigned char*)data;
    memoryStream.dataSize = dataSize;
    memoryStream.currentReadPos = 0;

    if (!drwav_init(pWav, drwav__on_read_memory, drwav__on_seek_memory, (void*)&memoryStream)) {
        return DRWAV_FALSE;
    }

    pWav->memoryStream = memoryStream;
    pWav->pUserData = &pWav->memoryStream;
    return DRWAV_TRUE;
}

drwav_bool32 drwav_init_memory_write(drwav* pWav, void** ppData, size_t* pDataSize, const drwav_data_format* pFormat)
{
    if (ppData == NULL) {
        return DRWAV_FALSE;
    }

    *ppData = NULL; // Important because we're using realloc()!
    *pDataSize = 0;

    drwav__memory_stream_write memoryStreamWrite;
    drwav_zero_memory(&memoryStreamWrite, sizeof(memoryStreamWrite));
    memoryStreamWrite.ppData = ppData;
    memoryStreamWrite.pDataSize = pDataSize;
    memoryStreamWrite.dataSize = 0;
    memoryStreamWrite.dataCapacity = 0;
    memoryStreamWrite.currentWritePos = 0;

    if (!drwav_init_write(pWav, pFormat, drwav__on_write_memory, drwav__on_seek_memory_write, (void*)&memoryStreamWrite)) {
        return DRWAV_FALSE;
    }

    pWav->memoryStreamWrite = memoryStreamWrite;
    pWav->pUserData = &pWav->memoryStreamWrite;
    return DRWAV_TRUE;
}

drwav* drwav_open_memory(const void* data, size_t dataSize)
{
    if (data == NULL || dataSize == 0) {
        return NULL;
    }

    drwav__memory_stream memoryStream;
    drwav_zero_memory(&memoryStream, sizeof(memoryStream));
    memoryStream.data = (const unsigned char*)data;
    memoryStream.dataSize = dataSize;
    memoryStream.currentReadPos = 0;

    drwav* pWav = drwav_open(drwav__on_read_memory, drwav__on_seek_memory, (void*)&memoryStream);
    if (pWav == NULL) {
        return NULL;
    }

    pWav->memoryStream = memoryStream;
    pWav->pUserData = &pWav->memoryStream;
    return pWav;
}

drwav* drwav_open_memory_write(void** ppData, size_t* pDataSize, const drwav_data_format* pFormat)
{
    if (ppData == NULL) {
        return NULL;
    }

    *ppData = NULL; // Important because we're using realloc()!
    *pDataSize = 0;

    drwav__memory_stream_write memoryStreamWrite;
    drwav_zero_memory(&memoryStreamWrite, sizeof(memoryStreamWrite));
    memoryStreamWrite.ppData = ppData;
    memoryStreamWrite.pDataSize = pDataSize;
    memoryStreamWrite.dataSize = 0;
    memoryStreamWrite.dataCapacity = 0;
    memoryStreamWrite.currentWritePos = 0;

    drwav* pWav = drwav_open_write(pFormat, drwav__on_write_memory, drwav__on_seek_memory_write, (void*)&memoryStreamWrite);
    if (pWav == NULL) {
        return NULL;
    }

    pWav->memoryStreamWrite = memoryStreamWrite;
    pWav->pUserData = &pWav->memoryStreamWrite;
    return pWav;
}


drwav_bool32 drwav_init(drwav* pWav, drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData)
{
    if (onRead == NULL || onSeek == NULL) {
        return DRWAV_FALSE;
    }

    drwav_zero_memory(pWav, sizeof(*pWav));


    // The first 4 bytes should be the RIFF identifier.
    unsigned char riff[4];
    if (onRead(pUserData, riff, sizeof(riff)) != sizeof(riff)) {
        return DRWAV_FALSE;    // Failed to read data.
    }

    // The first 4 bytes can be used to identify the container. For RIFF files it will start with "RIFF" and for
    // w64 it will start with "riff".
    if (drwav__fourcc_equal(riff, "RIFF")) {
        pWav->container = drwav_container_riff;
    } else if (drwav__fourcc_equal(riff, "riff")) {
        pWav->container = drwav_container_w64;

        // Check the rest of the GUID for validity.
        drwav_uint8 riff2[12];
        if (onRead(pUserData, riff2, sizeof(riff2)) != sizeof(riff2)) {
            return DRWAV_FALSE;
        }

        for (int i = 0; i < 12; ++i) {
            if (riff2[i] != drwavGUID_W64_RIFF[i+4]) {
                return DRWAV_FALSE;
            }
        }
    } else {
        return DRWAV_FALSE;   // Unknown or unsupported container.
    }


    if (pWav->container == drwav_container_riff) {
        // RIFF/WAVE
        unsigned char chunkSizeBytes[4];
        if (onRead(pUserData, chunkSizeBytes, sizeof(chunkSizeBytes)) != sizeof(chunkSizeBytes)) {
            return DRWAV_FALSE;
        }

        unsigned int chunkSize = drwav__bytes_to_u32(chunkSizeBytes);
        if (chunkSize < 36) {
            return DRWAV_FALSE;    // Chunk size should always be at least 36 bytes.
        }

        unsigned char wave[4];
        if (onRead(pUserData, wave, sizeof(wave)) != sizeof(wave)) {
            return DRWAV_FALSE;
        }

        if (!drwav__fourcc_equal(wave, "WAVE")) {
            return DRWAV_FALSE;    // Expecting "WAVE".
        }

        pWav->dataChunkDataPos = 4 + sizeof(chunkSizeBytes) + sizeof(wave);
    } else {
        // W64
        unsigned char chunkSize[8];
        if (onRead(pUserData, chunkSize, sizeof(chunkSize)) != sizeof(chunkSize)) {
            return DRWAV_FALSE;
        }

        if (drwav__bytes_to_u64(chunkSize) < 80) {
            return DRWAV_FALSE;
        }

        drwav_uint8 wave[16];
        if (onRead(pUserData, wave, sizeof(wave)) != sizeof(wave)) {
            return DRWAV_FALSE;
        }

        if (!drwav__guid_equal(wave, drwavGUID_W64_WAVE)) {
            return DRWAV_FALSE;
        }

        pWav->dataChunkDataPos = 16 + sizeof(chunkSize) + sizeof(wave);
    }


    // The next 24 bytes should be the "fmt " chunk.
    drwav_fmt fmt;
    if (!drwav__read_fmt(onRead, onSeek, pUserData, pWav->container, &pWav->dataChunkDataPos, &fmt)) {
        return DRWAV_FALSE;    // Failed to read the "fmt " chunk.
    }

    // Basic validation.
    if (fmt.sampleRate == 0 || fmt.channels == 0 || fmt.bitsPerSample == 0 || fmt.blockAlign == 0) {
        return DRWAV_FALSE; // Invalid channel count. Probably an invalid WAV file.
    }


    // Translate the internal format.
    unsigned short translatedFormatTag = fmt.formatTag;
    if (translatedFormatTag == DR_WAVE_FORMAT_EXTENSIBLE) {
        translatedFormatTag = drwav__bytes_to_u16(fmt.subFormat + 0);
    }


    drwav_uint64 sampleCountFromFactChunk = 0;

    // The next chunk we care about is the "data" chunk. This is not necessarily the next chunk so we'll need to loop.
    drwav_uint64 dataSize;
    for (;;)
    {
        drwav__chunk_header header;
        if (!drwav__read_chunk_header(onRead, pUserData, pWav->container, &pWav->dataChunkDataPos, &header)) {
            return DRWAV_FALSE;
        }

        dataSize = header.sizeInBytes;
        if (pWav->container == drwav_container_riff) {
            if (drwav__fourcc_equal(header.id.fourcc, "data")) {
                break;
            }
        } else {
            if (drwav__guid_equal(header.id.guid, drwavGUID_W64_DATA)) {
                break;
            }
        }

        // Optional. Get the total sample count from the FACT chunk. This is useful for compressed formats.
        if (pWav->container == drwav_container_riff) {
            if (drwav__fourcc_equal(header.id.fourcc, "fact")) {
                drwav_uint32 sampleCount;
                if (onRead(pUserData, &sampleCount, 4) != 4) {
                    return DRWAV_FALSE;
                }
                pWav->dataChunkDataPos += 4;
                dataSize -= 4;

                // The sample count in the "fact" chunk is either unreliable, or I'm not understanding it properly. For now I am only enabling this
                // for Microsoft ADPCM formats.
                if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM) {
                    sampleCountFromFactChunk = sampleCount;
                } else {
                    sampleCountFromFactChunk = 0;
                }
            }
        } else {
            if (drwav__guid_equal(header.id.guid, drwavGUID_W64_FACT)) {
                if (onRead(pUserData, &sampleCountFromFactChunk, 8) != 8) {
                    return DRWAV_FALSE;
                }
                pWav->dataChunkDataPos += 4;
                dataSize -= 8;
            }
        }

        // If we get here it means we didn't find the "data" chunk. Seek past it.

        // Make sure we seek past the padding.
        dataSize += header.paddingSize;
        drwav__seek_forward(onSeek, dataSize, pUserData);
        pWav->dataChunkDataPos += dataSize;
    }

    // At this point we should be sitting on the first byte of the raw audio data.

    pWav->onRead              = onRead;
    pWav->onSeek              = onSeek;
    pWav->pUserData           = pUserData;
    pWav->fmt                 = fmt;
    pWav->sampleRate          = fmt.sampleRate;
    pWav->channels            = fmt.channels;
    pWav->bitsPerSample       = fmt.bitsPerSample;
    pWav->bytesPerSample      = fmt.blockAlign / fmt.channels;
    pWav->bytesRemaining      = dataSize;
    pWav->translatedFormatTag = translatedFormatTag;
    pWav->dataChunkDataSize   = dataSize;

    // The bytes per sample should never be 0 at this point. This would indicate an invalid WAV file.
    if (pWav->bytesPerSample == 0) {
        return DRWAV_FALSE;
    }

    if (sampleCountFromFactChunk != 0) {
        pWav->totalSampleCount = sampleCountFromFactChunk * fmt.channels;
    } else {
        pWav->totalSampleCount = dataSize / pWav->bytesPerSample;

        if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM) {
            drwav_uint64 blockCount = dataSize / fmt.blockAlign;
            pWav->totalSampleCount = (blockCount * (fmt.blockAlign - (6*pWav->channels))) * 2;  // x2 because two samples per byte.
        }
        if (pWav->translatedFormatTag == DR_WAVE_FORMAT_DVI_ADPCM) {
            drwav_uint64 blockCount = dataSize / fmt.blockAlign;
            pWav->totalSampleCount = ((blockCount * (fmt.blockAlign - (4*pWav->channels))) * 2) + (blockCount * pWav->channels);
        }
    }

    // The way we calculate the bytes per sample does not make sense for compressed formats so we just set it to 0.
    if (drwav__is_compressed_format_tag(pWav->translatedFormatTag)) {
        pWav->bytesPerSample = 0;
    }

    // Some formats only support a certain number of channels.
    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM || pWav->translatedFormatTag == DR_WAVE_FORMAT_DVI_ADPCM) {
        if (pWav->channels > 2) {
            return DRWAV_FALSE;
        }
    }

#ifdef DR_WAV_LIBSNDFILE_COMPAT
    // I use libsndfile as a benchmark for testing, however in the version I'm using (from the Windows installer on the libsndfile website),
    // it appears the total sample count libsndfile uses for MS-ADPCM is incorrect. It would seem they are computing the total sample count
    // from the number of blocks, however this results in the inclusion of the extra silent samples at the end of the last block. The correct
    // way to know the total sample count is to inspect the "fact" chunk which should always be present for compressed formats, and should
    // always include the sample count. This little block of code below is only used to emulate the libsndfile logic so I can properly run my
    // correctness tests against libsndfile, and is disabled by default.
    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM) {
        drwav_uint64 blockCount = dataSize / fmt.blockAlign;
        pWav->totalSampleCount = (blockCount * (fmt.blockAlign - (6*pWav->channels))) * 2;  // x2 because two samples per byte.
    }
    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_DVI_ADPCM) {
        drwav_uint64 blockCount = dataSize / fmt.blockAlign;
        pWav->totalSampleCount = ((blockCount * (fmt.blockAlign - (4*pWav->channels))) * 2) + (blockCount * pWav->channels);
    }
#endif

    return DRWAV_TRUE;
}

drwav_bool32 drwav_init_write(drwav* pWav, const drwav_data_format* pFormat, drwav_write_proc onWrite, drwav_seek_proc onSeek, void* pUserData)
{
    if (onWrite == NULL || onSeek == NULL) {
        return DRWAV_FALSE;
    }

    // Not currently supporting compressed formats. Will need to add support for the "fact" chunk before we enable this.
    if (pFormat->format == DR_WAVE_FORMAT_EXTENSIBLE) {
        return DRWAV_FALSE;
    }
    if (pFormat->format == DR_WAVE_FORMAT_ADPCM || pFormat->format == DR_WAVE_FORMAT_DVI_ADPCM) {
        return DRWAV_FALSE;
    }


    drwav_zero_memory(pWav, sizeof(*pWav));
    pWav->onWrite = onWrite;
    pWav->onSeek = onSeek;
    pWav->pUserData = pUserData;
    pWav->fmt.formatTag = (drwav_uint16)pFormat->format;
    pWav->fmt.channels = (drwav_uint16)pFormat->channels;
    pWav->fmt.sampleRate = pFormat->sampleRate;
    pWav->fmt.avgBytesPerSec = (drwav_uint32)((pFormat->bitsPerSample * pFormat->sampleRate * pFormat->channels) >> 3);
    pWav->fmt.blockAlign = (drwav_uint16)((pFormat->channels * pFormat->bitsPerSample) >> 3);
    pWav->fmt.bitsPerSample = (drwav_uint16)pFormat->bitsPerSample;
    pWav->fmt.extendedSize = 0;

    size_t runningPos = 0;

    // "RIFF" chunk.
    drwav_uint64 chunkSizeRIFF = 0;
    if (pFormat->container == drwav_container_riff) {
        runningPos += pWav->onWrite(pUserData, "RIFF", 4);
        runningPos += pWav->onWrite(pUserData, &chunkSizeRIFF, 4);
        runningPos += pWav->onWrite(pUserData, "WAVE", 4);
    } else {
        runningPos += pWav->onWrite(pUserData, drwavGUID_W64_RIFF, 16);
        runningPos += pWav->onWrite(pUserData, &chunkSizeRIFF, 8);
        runningPos += pWav->onWrite(pUserData, drwavGUID_W64_WAVE, 16);
    }

    // "fmt " chunk.
    drwav_uint64 chunkSizeFMT;
    if (pFormat->container == drwav_container_riff) {
        chunkSizeFMT = 16;
        runningPos += pWav->onWrite(pUserData, "fmt ", 4);
        runningPos += pWav->onWrite(pUserData, &chunkSizeFMT, 4);
    } else {
        chunkSizeFMT = 40;
        runningPos += pWav->onWrite(pUserData, drwavGUID_W64_FMT, 16);
        runningPos += pWav->onWrite(pUserData, &chunkSizeFMT, 8);
    }

    runningPos += pWav->onWrite(pUserData, &pWav->fmt.formatTag,      2);
    runningPos += pWav->onWrite(pUserData, &pWav->fmt.channels,       2);
    runningPos += pWav->onWrite(pUserData, &pWav->fmt.sampleRate,     4);
    runningPos += pWav->onWrite(pUserData, &pWav->fmt.avgBytesPerSec, 4);
    runningPos += pWav->onWrite(pUserData, &pWav->fmt.blockAlign,     2);
    runningPos += pWav->onWrite(pUserData, &pWav->fmt.bitsPerSample,  2);

    pWav->dataChunkDataPos = runningPos;
    pWav->dataChunkDataSize = 0;

    // "data" chunk.
    drwav_uint64 chunkSizeDATA = 0;
    if (pFormat->container == drwav_container_riff) {
        runningPos += pWav->onWrite(pUserData, "data", 4);
        runningPos += pWav->onWrite(pUserData, &chunkSizeDATA, 4);
    } else {
        runningPos += pWav->onWrite(pUserData, drwavGUID_W64_DATA, 16);
        runningPos += pWav->onWrite(pUserData, &chunkSizeDATA, 8);
    }


    // Simple validation.
    if (pFormat->container == drwav_container_riff) {
        if (runningPos != 20 + chunkSizeFMT + 8) {
            return DRWAV_FALSE;
        }
    } else {
        if (runningPos != 40 + chunkSizeFMT + 24) {
            return DRWAV_FALSE;
        }
    }
    


    // Set some properties for the client's convenience.
    pWav->container = pFormat->container;
    pWav->channels = (drwav_uint16)pFormat->channels;
    pWav->sampleRate = pFormat->sampleRate;
    pWav->bitsPerSample = (drwav_uint16)pFormat->bitsPerSample;
    pWav->bytesPerSample = (drwav_uint16)(pFormat->bitsPerSample >> 3);
    pWav->translatedFormatTag = (drwav_uint16)pFormat->format;

    return DRWAV_TRUE;
}

void drwav_uninit(drwav* pWav)
{
    if (pWav == NULL) {
        return;
    }

    // If the drwav object was opened in write mode we'll need to finialize a few things:
    //   - Make sure the "data" chunk is aligned to 16-bits
    //   - Set the size of the "data" chunk.
    if (pWav->onWrite != NULL) {
        // Padding. Do not adjust pWav->dataChunkDataSize - this should not include the padding.
        drwav_uint32 paddingSize = 0;
        if (pWav->container == drwav_container_riff) {
            paddingSize = (drwav_uint32)(pWav->dataChunkDataSize % 2);
        } else {
            paddingSize = (drwav_uint32)(pWav->dataChunkDataSize % 8);
        }
        
        if (paddingSize > 0) {
            drwav_uint64 paddingData = 0;
            pWav->onWrite(pWav->pUserData, &paddingData, paddingSize);
        }


        // Chunk sizes.
        if (pWav->onSeek) {
            if (pWav->container == drwav_container_riff) {
                // The "RIFF" chunk size.
                if (pWav->onSeek(pWav->pUserData, 4, drwav_seek_origin_start)) {
                    drwav_uint32 riffChunkSize = 36;
                    if (pWav->dataChunkDataSize <= (0xFFFFFFFF - 36)) {
                        riffChunkSize = 36 + (drwav_uint32)pWav->dataChunkDataSize;
                    } else {
                        riffChunkSize = 0xFFFFFFFF;
                    }

                    pWav->onWrite(pWav->pUserData, &riffChunkSize, 4);
                }

                // the "data" chunk size.
                if (pWav->onSeek(pWav->pUserData, (int)pWav->dataChunkDataPos + 4, drwav_seek_origin_start)) {
                    drwav_uint32 dataChunkSize = 0;
                    if (pWav->dataChunkDataSize <= 0xFFFFFFFF) {
                        dataChunkSize = (drwav_uint32)pWav->dataChunkDataSize;
                    } else {
                        dataChunkSize = 0xFFFFFFFF;
                    }
                    
                    pWav->onWrite(pWav->pUserData, &dataChunkSize, 4);
                }
            } else {
                // The "RIFF" chunk size.
                if (pWav->onSeek(pWav->pUserData, 16, drwav_seek_origin_start)) {
                    drwav_uint64 riffChunkSize = 80 + 24 + pWav->dataChunkDataSize;
                    pWav->onWrite(pWav->pUserData, &riffChunkSize, 8);
                }

                // The "data" chunk size.
                if (pWav->onSeek(pWav->pUserData, (int)pWav->dataChunkDataPos + 16, drwav_seek_origin_start)) {
                    drwav_uint64 dataChunkSize = 24 + pWav->dataChunkDataSize;  // +24 because W64 includes the size of the GUID and size fields.
                    pWav->onWrite(pWav->pUserData, &dataChunkSize, 8);
                }
            }
        }
    }

#ifndef DR_WAV_NO_STDIO
    // If we opened the file with drwav_open_file() we will want to close the file handle. We can know whether or not drwav_open_file()
    // was used by looking at the onRead and onSeek callbacks.
    if (pWav->onRead == drwav__on_read_stdio || pWav->onWrite == drwav__on_write_stdio) {
        fclose((FILE*)pWav->pUserData);
    }
#endif
}


drwav* drwav_open(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData)
{
    drwav* pWav = (drwav*)DRWAV_MALLOC(sizeof(*pWav));
    if (pWav == NULL) {
        return NULL;
    }

    if (!drwav_init(pWav, onRead, onSeek, pUserData)) {
        DRWAV_FREE(pWav);
        return NULL;
    }

    return pWav;
}

drwav* drwav_open_write(const drwav_data_format* pFormat, drwav_write_proc onWrite, drwav_seek_proc onSeek, void* pUserData)
{
    drwav* pWav = (drwav*)DRWAV_MALLOC(sizeof(*pWav));
    if (pWav == NULL) {
        return NULL;
    }

    if (!drwav_init_write(pWav, pFormat, onWrite, onSeek, pUserData)) {
        DRWAV_FREE(pWav);
        return NULL;
    }

    return pWav;
}

void drwav_close(drwav* pWav)
{
    drwav_uninit(pWav);
    DRWAV_FREE(pWav);
}


size_t drwav_read_raw(drwav* pWav, size_t bytesToRead, void* pBufferOut)
{
    if (pWav == NULL || bytesToRead == 0 || pBufferOut == NULL) {
        return 0;
    }

    if (bytesToRead > pWav->bytesRemaining) {
        bytesToRead = (size_t)pWav->bytesRemaining;
    }

    size_t bytesRead = pWav->onRead(pWav->pUserData, pBufferOut, bytesToRead);

    pWav->bytesRemaining -= bytesRead;
    return bytesRead;
}

drwav_uint64 drwav_read(drwav* pWav, drwav_uint64 samplesToRead, void* pBufferOut)
{
    if (pWav == NULL || samplesToRead == 0 || pBufferOut == NULL) {
        return 0;
    }

    // Cannot use this function for compressed formats.
    if (drwav__is_compressed_format_tag(pWav->translatedFormatTag)) {
        return 0;
    }

    // Don't try to read more samples than can potentially fit in the output buffer.
    if (samplesToRead * pWav->bytesPerSample > SIZE_MAX) {
        samplesToRead = SIZE_MAX / pWav->bytesPerSample;
    }

    size_t bytesRead = drwav_read_raw(pWav, (size_t)(samplesToRead * pWav->bytesPerSample), pBufferOut);
    return bytesRead / pWav->bytesPerSample;
}

drwav_bool32 drwav_seek_to_first_sample(drwav* pWav)
{
    if (!pWav->onSeek(pWav->pUserData, (int)pWav->dataChunkDataPos, drwav_seek_origin_start)) {
        return DRWAV_FALSE;
    }

    if (drwav__is_compressed_format_tag(pWav->translatedFormatTag)) {
        pWav->compressed.iCurrentSample = 0;
    }
    
    pWav->bytesRemaining = pWav->dataChunkDataSize;
    return DRWAV_TRUE;
}

drwav_bool32 drwav_seek_to_sample(drwav* pWav, drwav_uint64 sample)
{
    // Seeking should be compatible with wave files > 2GB.

    if (pWav == NULL || pWav->onSeek == NULL) {
        return DRWAV_FALSE;
    }

    // If there are no samples, just return DRWAV_TRUE without doing anything.
    if (pWav->totalSampleCount == 0) {
        return DRWAV_TRUE;
    }

    // Make sure the sample is clamped.
    if (sample >= pWav->totalSampleCount) {
        sample  = pWav->totalSampleCount - 1;
    }


    // For compressed formats we just use a slow generic seek. If we are seeking forward we just seek forward. If we are going backwards we need
    // to seek back to the start.
    if (drwav__is_compressed_format_tag(pWav->translatedFormatTag)) {
        // TODO: This can be optimized.
        
        // If we're seeking forward it's simple - just keep reading samples until we hit the sample we're requesting. If we're seeking backwards,
        // we first need to seek back to the start and then just do the same thing as a forward seek.
        if (sample < pWav->compressed.iCurrentSample) {
            if (!drwav_seek_to_first_sample(pWav)) {
                return DRWAV_FALSE;
            }
        }

        if (sample > pWav->compressed.iCurrentSample) {
            drwav_uint64 offset = sample - pWav->compressed.iCurrentSample;

            drwav_int16 devnull[2048];
            while (offset > 0) {
                drwav_uint64 samplesToRead = offset;
                if (samplesToRead > 2048) {
                    samplesToRead = 2048;
                }

                drwav_uint64 samplesRead = 0;
                if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM) {
                    samplesRead = drwav_read_s16__msadpcm(pWav, samplesToRead, devnull);
                } else if (pWav->translatedFormatTag == DR_WAVE_FORMAT_DVI_ADPCM) {
                    samplesRead = drwav_read_s16__ima(pWav, samplesToRead, devnull);
                } else {
                    assert(DRWAV_FALSE);    // If this assertion is triggered it means I've implemented a new compressed format but forgot to add a branch for it here.
                }

                if (samplesRead != samplesToRead) {
                    return DRWAV_FALSE;
                }

                offset -= samplesRead;
            }
        }
    } else {
        drwav_uint64 totalSizeInBytes = pWav->totalSampleCount * pWav->bytesPerSample;
        drwav_assert(totalSizeInBytes >= pWav->bytesRemaining);

        drwav_uint64 currentBytePos = totalSizeInBytes - pWav->bytesRemaining;
        drwav_uint64 targetBytePos  = sample * pWav->bytesPerSample;

        drwav_uint64 offset;
        if (currentBytePos < targetBytePos) {
            // Offset forwards.
            offset = (targetBytePos - currentBytePos);
        } else {
            // Offset backwards.
            if (!drwav_seek_to_first_sample(pWav)) {
                return DRWAV_FALSE;
            }
            offset = targetBytePos;
        }

        while (offset > 0) {
            int offset32 = ((offset > INT_MAX) ? INT_MAX : (int)offset);
            if (!pWav->onSeek(pWav->pUserData, offset32, drwav_seek_origin_current)) {
                return DRWAV_FALSE;
            }

            pWav->bytesRemaining -= offset32;
            offset -= offset32;
        }
    }

    return DRWAV_TRUE;
}


size_t drwav_write_raw(drwav* pWav, size_t bytesToWrite, const void* pData)
{
    if (pWav == NULL || bytesToWrite == 0 || pData == NULL) {
        return 0;
    }

    size_t bytesWritten = pWav->onWrite(pWav->pUserData, pData, bytesToWrite);
    pWav->dataChunkDataSize += bytesWritten;

    return bytesWritten;
}

drwav_uint64 drwav_write(drwav* pWav, drwav_uint64 samplesToWrite, const void* pData)
{
    if (pWav == NULL || samplesToWrite == 0 || pData == NULL) {
        return 0;
    }

    drwav_uint64 bytesToWrite = ((samplesToWrite * pWav->bitsPerSample) / 8);
    if (bytesToWrite > SIZE_MAX) {
        return 0;
    }

    size_t bytesWritten = drwav_write_raw(pWav, (size_t)bytesToWrite, pData);
    return ((drwav_uint64)bytesWritten * 8) / pWav->bitsPerSample;
}



drwav_uint64 drwav_read_s16__msadpcm(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut)
{
    drwav_assert(pWav != NULL);
    drwav_assert(samplesToRead > 0);
    drwav_assert(pBufferOut != NULL);

    // TODO: Lots of room for optimization here.

    drwav_uint64 totalSamplesRead = 0;

    while (samplesToRead > 0 && pWav->compressed.iCurrentSample < pWav->totalSampleCount) {
        // If there are no cached samples we need to load a new block.
        if (pWav->msadpcm.cachedSampleCount == 0 && pWav->msadpcm.bytesRemainingInBlock == 0) {
            if (pWav->channels == 1) {
                // Mono.
                drwav_uint8 header[7];
                if (pWav->onRead(pWav->pUserData, header, sizeof(header)) != sizeof(header)) {
                    return totalSamplesRead;
                }
                pWav->msadpcm.bytesRemainingInBlock = pWav->fmt.blockAlign - sizeof(header);

                pWav->msadpcm.predictor[0] = header[0];
                pWav->msadpcm.delta[0] = drwav__bytes_to_s16(header + 1);
                pWav->msadpcm.prevSamples[0][1] = (drwav_int32)drwav__bytes_to_s16(header + 3);
                pWav->msadpcm.prevSamples[0][0] = (drwav_int32)drwav__bytes_to_s16(header + 5);
                pWav->msadpcm.cachedSamples[2] = pWav->msadpcm.prevSamples[0][0];
                pWav->msadpcm.cachedSamples[3] = pWav->msadpcm.prevSamples[0][1];
                pWav->msadpcm.cachedSampleCount = 2;
            } else {
                // Stereo.
                drwav_uint8 header[14];
                if (pWav->onRead(pWav->pUserData, header, sizeof(header)) != sizeof(header)) {
                    return totalSamplesRead;
                }
                pWav->msadpcm.bytesRemainingInBlock = pWav->fmt.blockAlign - sizeof(header);

                pWav->msadpcm.predictor[0] = header[0];
                pWav->msadpcm.predictor[1] = header[1];
                pWav->msadpcm.delta[0] = drwav__bytes_to_s16(header + 2);
                pWav->msadpcm.delta[1] = drwav__bytes_to_s16(header + 4);
                pWav->msadpcm.prevSamples[0][1] = (drwav_int32)drwav__bytes_to_s16(header + 6);
                pWav->msadpcm.prevSamples[1][1] = (drwav_int32)drwav__bytes_to_s16(header + 8);
                pWav->msadpcm.prevSamples[0][0] = (drwav_int32)drwav__bytes_to_s16(header + 10);
                pWav->msadpcm.prevSamples[1][0] = (drwav_int32)drwav__bytes_to_s16(header + 12);

                pWav->msadpcm.cachedSamples[0] = pWav->msadpcm.prevSamples[0][0];
                pWav->msadpcm.cachedSamples[1] = pWav->msadpcm.prevSamples[1][0];
                pWav->msadpcm.cachedSamples[2] = pWav->msadpcm.prevSamples[0][1];
                pWav->msadpcm.cachedSamples[3] = pWav->msadpcm.prevSamples[1][1];
                pWav->msadpcm.cachedSampleCount = 4;
            }
        }

        // Output anything that's cached.
        while (samplesToRead > 0 && pWav->msadpcm.cachedSampleCount > 0 && pWav->compressed.iCurrentSample < pWav->totalSampleCount) {
            pBufferOut[0] = (drwav_int16)pWav->msadpcm.cachedSamples[drwav_countof(pWav->msadpcm.cachedSamples) - pWav->msadpcm.cachedSampleCount];
            pWav->msadpcm.cachedSampleCount -= 1;

            pBufferOut += 1;
            samplesToRead -= 1;
            totalSamplesRead += 1;
            pWav->compressed.iCurrentSample += 1;
        }

        if (samplesToRead == 0) {
            return totalSamplesRead;
        }


        // If there's nothing left in the cache, just go ahead and load more. If there's nothing left to load in the current block we just continue to the next
        // loop iteration which will trigger the loading of a new block.
        if (pWav->msadpcm.cachedSampleCount == 0) {
            if (pWav->msadpcm.bytesRemainingInBlock == 0) {
                continue;
            } else {
                drwav_uint8 nibbles;
                if (pWav->onRead(pWav->pUserData, &nibbles, 1) != 1) {
                    return totalSamplesRead;
                }
                pWav->msadpcm.bytesRemainingInBlock -= 1;

                // TODO: Optimize away these if statements.
                drwav_int32 nibble0 = ((nibbles & 0xF0) >> 4); if ((nibbles & 0x80)) { nibble0 |= 0xFFFFFFF0UL; }
                drwav_int32 nibble1 = ((nibbles & 0x0F) >> 0); if ((nibbles & 0x08)) { nibble1 |= 0xFFFFFFF0UL; }

                static drwav_int32 adaptationTable[] = { 
                    230, 230, 230, 230, 307, 409, 512, 614, 
                    768, 614, 512, 409, 307, 230, 230, 230 
                };
                static drwav_int32 coeff1Table[] = { 256, 512, 0, 192, 240, 460,  392 };
                static drwav_int32 coeff2Table[] = { 0,  -256, 0, 64,  0,  -208, -232 };

                if (pWav->channels == 1) {
                    // Mono.
                    drwav_int32 newSample0;
                    newSample0  = ((pWav->msadpcm.prevSamples[0][1] * coeff1Table[pWav->msadpcm.predictor[0]]) + (pWav->msadpcm.prevSamples[0][0] * coeff2Table[pWav->msadpcm.predictor[0]])) >> 8;
                    newSample0 += nibble0 * pWav->msadpcm.delta[0];
                    newSample0  = drwav_clamp(newSample0, -32768, 32767);

                    pWav->msadpcm.delta[0] = (adaptationTable[((nibbles & 0xF0) >> 4)] * pWav->msadpcm.delta[0]) >> 8;
                    if (pWav->msadpcm.delta[0] < 16) {
                        pWav->msadpcm.delta[0] = 16;
                    }

                    pWav->msadpcm.prevSamples[0][0] = pWav->msadpcm.prevSamples[0][1];
                    pWav->msadpcm.prevSamples[0][1] = newSample0;


                    drwav_int32 newSample1;
                    newSample1  = ((pWav->msadpcm.prevSamples[0][1] * coeff1Table[pWav->msadpcm.predictor[0]]) + (pWav->msadpcm.prevSamples[0][0] * coeff2Table[pWav->msadpcm.predictor[0]])) >> 8;
                    newSample1 += nibble1 * pWav->msadpcm.delta[0];
                    newSample1  = drwav_clamp(newSample1, -32768, 32767);

                    pWav->msadpcm.delta[0] = (adaptationTable[((nibbles & 0x0F) >> 0)] * pWav->msadpcm.delta[0]) >> 8;
                    if (pWav->msadpcm.delta[0] < 16) {
                        pWav->msadpcm.delta[0] = 16;
                    }

                    pWav->msadpcm.prevSamples[0][0] = pWav->msadpcm.prevSamples[0][1];
                    pWav->msadpcm.prevSamples[0][1] = newSample1;


                    pWav->msadpcm.cachedSamples[2] = newSample0;
                    pWav->msadpcm.cachedSamples[3] = newSample1;
                    pWav->msadpcm.cachedSampleCount = 2;
                } else {
                    // Stereo.

                    // Left.
                    drwav_int32 newSample0;
                    newSample0  = ((pWav->msadpcm.prevSamples[0][1] * coeff1Table[pWav->msadpcm.predictor[0]]) + (pWav->msadpcm.prevSamples[0][0] * coeff2Table[pWav->msadpcm.predictor[0]])) >> 8;
                    newSample0 += nibble0 * pWav->msadpcm.delta[0];
                    newSample0  = drwav_clamp(newSample0, -32768, 32767);

                    pWav->msadpcm.delta[0] = (adaptationTable[((nibbles & 0xF0) >> 4)] * pWav->msadpcm.delta[0]) >> 8;
                    if (pWav->msadpcm.delta[0] < 16) {
                        pWav->msadpcm.delta[0] = 16;
                    }

                    pWav->msadpcm.prevSamples[0][0] = pWav->msadpcm.prevSamples[0][1];
                    pWav->msadpcm.prevSamples[0][1] = newSample0;


                    // Right.
                    drwav_int32 newSample1;
                    newSample1  = ((pWav->msadpcm.prevSamples[1][1] * coeff1Table[pWav->msadpcm.predictor[1]]) + (pWav->msadpcm.prevSamples[1][0] * coeff2Table[pWav->msadpcm.predictor[1]])) >> 8;
                    newSample1 += nibble1 * pWav->msadpcm.delta[1];
                    newSample1  = drwav_clamp(newSample1, -32768, 32767);

                    pWav->msadpcm.delta[1] = (adaptationTable[((nibbles & 0x0F) >> 0)] * pWav->msadpcm.delta[1]) >> 8;
                    if (pWav->msadpcm.delta[1] < 16) {
                        pWav->msadpcm.delta[1] = 16;
                    }

                    pWav->msadpcm.prevSamples[1][0] = pWav->msadpcm.prevSamples[1][1];
                    pWav->msadpcm.prevSamples[1][1] = newSample1;

                    pWav->msadpcm.cachedSamples[2] = newSample0;
                    pWav->msadpcm.cachedSamples[3] = newSample1;
                    pWav->msadpcm.cachedSampleCount = 2;
                }
            }
        }
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s16__ima(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut)
{
    drwav_assert(pWav != NULL);
    drwav_assert(samplesToRead > 0);
    drwav_assert(pBufferOut != NULL);

    // TODO: Lots of room for optimization here.

    drwav_uint64 totalSamplesRead = 0;

    while (samplesToRead > 0 && pWav->compressed.iCurrentSample < pWav->totalSampleCount) {
        // If there are no cached samples we need to load a new block.
        if (pWav->ima.cachedSampleCount == 0 && pWav->ima.bytesRemainingInBlock == 0) {
            if (pWav->channels == 1) {
                // Mono.
                drwav_uint8 header[4];
                if (pWav->onRead(pWav->pUserData, header, sizeof(header)) != sizeof(header)) {
                    return totalSamplesRead;
                }
                pWav->ima.bytesRemainingInBlock = pWav->fmt.blockAlign - sizeof(header);

                pWav->ima.predictor[0] = drwav__bytes_to_s16(header + 0);
                pWav->ima.stepIndex[0] = header[2];
                pWav->ima.cachedSamples[drwav_countof(pWav->ima.cachedSamples) - 1] = pWav->ima.predictor[0];
                pWav->ima.cachedSampleCount = 1;
            } else {
                // Stereo.
                drwav_uint8 header[8];
                if (pWav->onRead(pWav->pUserData, header, sizeof(header)) != sizeof(header)) {
                    return totalSamplesRead;
                }
                pWav->ima.bytesRemainingInBlock = pWav->fmt.blockAlign - sizeof(header);

                pWav->ima.predictor[0] = drwav__bytes_to_s16(header + 0);
                pWav->ima.stepIndex[0] = header[2];
                pWav->ima.predictor[1] = drwav__bytes_to_s16(header + 4);
                pWav->ima.stepIndex[1] = header[6];

                pWav->ima.cachedSamples[drwav_countof(pWav->ima.cachedSamples) - 2] = pWav->ima.predictor[0];
                pWav->ima.cachedSamples[drwav_countof(pWav->ima.cachedSamples) - 1] = pWav->ima.predictor[1];
                pWav->ima.cachedSampleCount = 2;
            }
        }

        // Output anything that's cached.
        while (samplesToRead > 0 && pWav->ima.cachedSampleCount > 0 && pWav->compressed.iCurrentSample < pWav->totalSampleCount) {
            pBufferOut[0] = (drwav_int16)pWav->ima.cachedSamples[drwav_countof(pWav->ima.cachedSamples) - pWav->ima.cachedSampleCount];
            pWav->ima.cachedSampleCount -= 1;

            pBufferOut += 1;
            samplesToRead -= 1;
            totalSamplesRead += 1;
            pWav->compressed.iCurrentSample += 1;
        }

        if (samplesToRead == 0) {
            return totalSamplesRead;
        }

        // If there's nothing left in the cache, just go ahead and load more. If there's nothing left to load in the current block we just continue to the next
        // loop iteration which will trigger the loading of a new block.
        if (pWav->ima.cachedSampleCount == 0) {
            if (pWav->ima.bytesRemainingInBlock == 0) {
                continue;
            } else {
                static drwav_int32 indexTable[16] = {
                    -1, -1, -1, -1, 2, 4, 6, 8,
                    -1, -1, -1, -1, 2, 4, 6, 8
                };

                static drwav_int32 stepTable[89] = { 
                    7,     8,     9,     10,    11,    12,    13,    14,    16,    17, 
                    19,    21,    23,    25,    28,    31,    34,    37,    41,    45, 
                    50,    55,    60,    66,    73,    80,    88,    97,    107,   118, 
                    130,   143,   157,   173,   190,   209,   230,   253,   279,   307,
                    337,   371,   408,   449,   494,   544,   598,   658,   724,   796,
                    876,   963,   1060,  1166,  1282,  1411,  1552,  1707,  1878,  2066, 
                    2272,  2499,  2749,  3024,  3327,  3660,  4026,  4428,  4871,  5358,
                    5894,  6484,  7132,  7845,  8630,  9493,  10442, 11487, 12635, 13899, 
                    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767 
                };

                // From what I can tell with stereo streams, it looks like every 4 bytes (8 samples) is for one channel. So it goes 4 bytes for the
                // left channel, 4 bytes for the right channel.
                pWav->ima.cachedSampleCount = 8 * pWav->channels;
                for (drwav_uint32 iChannel = 0; iChannel < pWav->channels; ++iChannel) {
                    drwav_uint8 nibbles[4];
                    if (pWav->onRead(pWav->pUserData, &nibbles, 4) != 4) {
                        return totalSamplesRead;
                    }
                    pWav->ima.bytesRemainingInBlock -= 4;

                    for (drwav_uint32 iByte = 0; iByte < 4; ++iByte) {
                        drwav_uint8 nibble0 = ((nibbles[iByte] & 0x0F) >> 0);
                        drwav_uint8 nibble1 = ((nibbles[iByte] & 0xF0) >> 4);

                        drwav_int32 step      = stepTable[pWav->ima.stepIndex[iChannel]];
                        drwav_int32 predictor = pWav->ima.predictor[iChannel];

                        drwav_int32      diff  = step >> 3;
                        if (nibble0 & 1) diff += step >> 2;
                        if (nibble0 & 2) diff += step >> 1;
                        if (nibble0 & 4) diff += step;
                        if (nibble0 & 8) diff  = -diff;

                        predictor = drwav_clamp(predictor + diff, -32768, 32767);
                        pWav->ima.predictor[iChannel] = predictor;
                        pWav->ima.stepIndex[iChannel] = drwav_clamp(pWav->ima.stepIndex[iChannel] + indexTable[nibble0], 0, (drwav_int32)drwav_countof(stepTable)-1);
                        pWav->ima.cachedSamples[(drwav_countof(pWav->ima.cachedSamples) - pWav->ima.cachedSampleCount) + (iByte*2+0)*pWav->channels + iChannel] = predictor;


                        step      = stepTable[pWav->ima.stepIndex[iChannel]];
                        predictor = pWav->ima.predictor[iChannel];

                                         diff  = step >> 3;
                        if (nibble1 & 1) diff += step >> 2;
                        if (nibble1 & 2) diff += step >> 1;
                        if (nibble1 & 4) diff += step;
                        if (nibble1 & 8) diff  = -diff;

                        predictor = drwav_clamp(predictor + diff, -32768, 32767);
                        pWav->ima.predictor[iChannel] = predictor;
                        pWav->ima.stepIndex[iChannel] = drwav_clamp(pWav->ima.stepIndex[iChannel] + indexTable[nibble1], 0, (drwav_int32)drwav_countof(stepTable)-1);
                        pWav->ima.cachedSamples[(drwav_countof(pWav->ima.cachedSamples) - pWav->ima.cachedSampleCount) + (iByte*2+1)*pWav->channels + iChannel] = predictor;
                    }
                }
            }
        }
    }

    return totalSamplesRead;
}


#ifndef DR_WAV_NO_CONVERSION_API
static unsigned short g_drwavAlawTable[256] = {
    0xEA80, 0xEB80, 0xE880, 0xE980, 0xEE80, 0xEF80, 0xEC80, 0xED80, 0xE280, 0xE380, 0xE080, 0xE180, 0xE680, 0xE780, 0xE480, 0xE580, 
    0xF540, 0xF5C0, 0xF440, 0xF4C0, 0xF740, 0xF7C0, 0xF640, 0xF6C0, 0xF140, 0xF1C0, 0xF040, 0xF0C0, 0xF340, 0xF3C0, 0xF240, 0xF2C0, 
    0xAA00, 0xAE00, 0xA200, 0xA600, 0xBA00, 0xBE00, 0xB200, 0xB600, 0x8A00, 0x8E00, 0x8200, 0x8600, 0x9A00, 0x9E00, 0x9200, 0x9600, 
    0xD500, 0xD700, 0xD100, 0xD300, 0xDD00, 0xDF00, 0xD900, 0xDB00, 0xC500, 0xC700, 0xC100, 0xC300, 0xCD00, 0xCF00, 0xC900, 0xCB00, 
    0xFEA8, 0xFEB8, 0xFE88, 0xFE98, 0xFEE8, 0xFEF8, 0xFEC8, 0xFED8, 0xFE28, 0xFE38, 0xFE08, 0xFE18, 0xFE68, 0xFE78, 0xFE48, 0xFE58, 
    0xFFA8, 0xFFB8, 0xFF88, 0xFF98, 0xFFE8, 0xFFF8, 0xFFC8, 0xFFD8, 0xFF28, 0xFF38, 0xFF08, 0xFF18, 0xFF68, 0xFF78, 0xFF48, 0xFF58, 
    0xFAA0, 0xFAE0, 0xFA20, 0xFA60, 0xFBA0, 0xFBE0, 0xFB20, 0xFB60, 0xF8A0, 0xF8E0, 0xF820, 0xF860, 0xF9A0, 0xF9E0, 0xF920, 0xF960, 
    0xFD50, 0xFD70, 0xFD10, 0xFD30, 0xFDD0, 0xFDF0, 0xFD90, 0xFDB0, 0xFC50, 0xFC70, 0xFC10, 0xFC30, 0xFCD0, 0xFCF0, 0xFC90, 0xFCB0, 
    0x1580, 0x1480, 0x1780, 0x1680, 0x1180, 0x1080, 0x1380, 0x1280, 0x1D80, 0x1C80, 0x1F80, 0x1E80, 0x1980, 0x1880, 0x1B80, 0x1A80, 
    0x0AC0, 0x0A40, 0x0BC0, 0x0B40, 0x08C0, 0x0840, 0x09C0, 0x0940, 0x0EC0, 0x0E40, 0x0FC0, 0x0F40, 0x0CC0, 0x0C40, 0x0DC0, 0x0D40, 
    0x5600, 0x5200, 0x5E00, 0x5A00, 0x4600, 0x4200, 0x4E00, 0x4A00, 0x7600, 0x7200, 0x7E00, 0x7A00, 0x6600, 0x6200, 0x6E00, 0x6A00, 
    0x2B00, 0x2900, 0x2F00, 0x2D00, 0x2300, 0x2100, 0x2700, 0x2500, 0x3B00, 0x3900, 0x3F00, 0x3D00, 0x3300, 0x3100, 0x3700, 0x3500, 
    0x0158, 0x0148, 0x0178, 0x0168, 0x0118, 0x0108, 0x0138, 0x0128, 0x01D8, 0x01C8, 0x01F8, 0x01E8, 0x0198, 0x0188, 0x01B8, 0x01A8, 
    0x0058, 0x0048, 0x0078, 0x0068, 0x0018, 0x0008, 0x0038, 0x0028, 0x00D8, 0x00C8, 0x00F8, 0x00E8, 0x0098, 0x0088, 0x00B8, 0x00A8, 
    0x0560, 0x0520, 0x05E0, 0x05A0, 0x0460, 0x0420, 0x04E0, 0x04A0, 0x0760, 0x0720, 0x07E0, 0x07A0, 0x0660, 0x0620, 0x06E0, 0x06A0, 
    0x02B0, 0x0290, 0x02F0, 0x02D0, 0x0230, 0x0210, 0x0270, 0x0250, 0x03B0, 0x0390, 0x03F0, 0x03D0, 0x0330, 0x0310, 0x0370, 0x0350
};

static unsigned short g_drwavMulawTable[256] = {
    0x8284, 0x8684, 0x8A84, 0x8E84, 0x9284, 0x9684, 0x9A84, 0x9E84, 0xA284, 0xA684, 0xAA84, 0xAE84, 0xB284, 0xB684, 0xBA84, 0xBE84, 
    0xC184, 0xC384, 0xC584, 0xC784, 0xC984, 0xCB84, 0xCD84, 0xCF84, 0xD184, 0xD384, 0xD584, 0xD784, 0xD984, 0xDB84, 0xDD84, 0xDF84, 
    0xE104, 0xE204, 0xE304, 0xE404, 0xE504, 0xE604, 0xE704, 0xE804, 0xE904, 0xEA04, 0xEB04, 0xEC04, 0xED04, 0xEE04, 0xEF04, 0xF004, 
    0xF0C4, 0xF144, 0xF1C4, 0xF244, 0xF2C4, 0xF344, 0xF3C4, 0xF444, 0xF4C4, 0xF544, 0xF5C4, 0xF644, 0xF6C4, 0xF744, 0xF7C4, 0xF844, 
    0xF8A4, 0xF8E4, 0xF924, 0xF964, 0xF9A4, 0xF9E4, 0xFA24, 0xFA64, 0xFAA4, 0xFAE4, 0xFB24, 0xFB64, 0xFBA4, 0xFBE4, 0xFC24, 0xFC64, 
    0xFC94, 0xFCB4, 0xFCD4, 0xFCF4, 0xFD14, 0xFD34, 0xFD54, 0xFD74, 0xFD94, 0xFDB4, 0xFDD4, 0xFDF4, 0xFE14, 0xFE34, 0xFE54, 0xFE74, 
    0xFE8C, 0xFE9C, 0xFEAC, 0xFEBC, 0xFECC, 0xFEDC, 0xFEEC, 0xFEFC, 0xFF0C, 0xFF1C, 0xFF2C, 0xFF3C, 0xFF4C, 0xFF5C, 0xFF6C, 0xFF7C, 
    0xFF88, 0xFF90, 0xFF98, 0xFFA0, 0xFFA8, 0xFFB0, 0xFFB8, 0xFFC0, 0xFFC8, 0xFFD0, 0xFFD8, 0xFFE0, 0xFFE8, 0xFFF0, 0xFFF8, 0x0000, 
    0x7D7C, 0x797C, 0x757C, 0x717C, 0x6D7C, 0x697C, 0x657C, 0x617C, 0x5D7C, 0x597C, 0x557C, 0x517C, 0x4D7C, 0x497C, 0x457C, 0x417C, 
    0x3E7C, 0x3C7C, 0x3A7C, 0x387C, 0x367C, 0x347C, 0x327C, 0x307C, 0x2E7C, 0x2C7C, 0x2A7C, 0x287C, 0x267C, 0x247C, 0x227C, 0x207C, 
    0x1EFC, 0x1DFC, 0x1CFC, 0x1BFC, 0x1AFC, 0x19FC, 0x18FC, 0x17FC, 0x16FC, 0x15FC, 0x14FC, 0x13FC, 0x12FC, 0x11FC, 0x10FC, 0x0FFC, 
    0x0F3C, 0x0EBC, 0x0E3C, 0x0DBC, 0x0D3C, 0x0CBC, 0x0C3C, 0x0BBC, 0x0B3C, 0x0ABC, 0x0A3C, 0x09BC, 0x093C, 0x08BC, 0x083C, 0x07BC, 
    0x075C, 0x071C, 0x06DC, 0x069C, 0x065C, 0x061C, 0x05DC, 0x059C, 0x055C, 0x051C, 0x04DC, 0x049C, 0x045C, 0x041C, 0x03DC, 0x039C, 
    0x036C, 0x034C, 0x032C, 0x030C, 0x02EC, 0x02CC, 0x02AC, 0x028C, 0x026C, 0x024C, 0x022C, 0x020C, 0x01EC, 0x01CC, 0x01AC, 0x018C, 
    0x0174, 0x0164, 0x0154, 0x0144, 0x0134, 0x0124, 0x0114, 0x0104, 0x00F4, 0x00E4, 0x00D4, 0x00C4, 0x00B4, 0x00A4, 0x0094, 0x0084, 
    0x0078, 0x0070, 0x0068, 0x0060, 0x0058, 0x0050, 0x0048, 0x0040, 0x0038, 0x0030, 0x0028, 0x0020, 0x0018, 0x0010, 0x0008, 0x0000
};

static DRWAV_INLINE drwav_int16 drwav__alaw_to_s16(drwav_uint8 sampleIn)
{
    return (short)g_drwavAlawTable[sampleIn];
}

static DRWAV_INLINE drwav_int16 drwav__mulaw_to_s16(drwav_uint8 sampleIn)
{
    return (short)g_drwavMulawTable[sampleIn];
}



static void drwav__pcm_to_s16(drwav_int16* pOut, const unsigned char* pIn, size_t totalSampleCount, unsigned short bytesPerSample)
{
    // Special case for 8-bit sample data because it's treated as unsigned.
    if (bytesPerSample == 1) {
        drwav_u8_to_s16(pOut, pIn, totalSampleCount);
        return;
    }


    // Slightly more optimal implementation for common formats.
    if (bytesPerSample == 2) {
        for (unsigned int i = 0; i < totalSampleCount; ++i) {
           *pOut++ = ((drwav_int16*)pIn)[i];
        }
        return;
    }
    if (bytesPerSample == 3) {
        drwav_s24_to_s16(pOut, pIn, totalSampleCount);
        return;
    }
    if (bytesPerSample == 4) {
        drwav_s32_to_s16(pOut, (const drwav_int32*)pIn, totalSampleCount);
        return;
    }


    // Anything more than 64 bits per sample is not supported.
    if (bytesPerSample > 8) {
        drwav_zero_memory(pOut, totalSampleCount * sizeof(*pOut));
        return;
    }


    // Generic, slow converter.
    for (unsigned int i = 0; i < totalSampleCount; ++i) {
        drwav_uint64 sample = 0;
        unsigned int shift  = (8 - bytesPerSample) * 8;

        unsigned int j;
        for (j = 0; j < bytesPerSample && j < 8; j += 1) {
            sample |= (drwav_uint64)(pIn[j]) << shift;
            shift  += 8;
        }

        pIn += j;
        *pOut++ = (drwav_int16)((drwav_int64)sample >> 48);
    }
}

static void drwav__ieee_to_s16(drwav_int16* pOut, const unsigned char* pIn, size_t totalSampleCount, unsigned short bytesPerSample)
{
    if (bytesPerSample == 4) {
        drwav_f32_to_s16(pOut, (float*)pIn, totalSampleCount);
        return;
    } else if (bytesPerSample == 8) {
        drwav_f64_to_s16(pOut, (double*)pIn, totalSampleCount);
        return;
    } else {
        // Only supporting 32- and 64-bit float. Output silence in all other cases. Contributions welcome for 16-bit float.
        drwav_zero_memory(pOut, totalSampleCount * sizeof(*pOut));
        return;
    }
}

drwav_uint64 drwav_read_s16__pcm(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut)
{
    // Fast path.
    if (pWav->bytesPerSample == 2) {
        return drwav_read(pWav, samplesToRead, pBufferOut);
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav__pcm_to_s16(pBufferOut, sampleData, (size_t)samplesRead, pWav->bytesPerSample);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s16__ieee(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut)
{
    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav__ieee_to_s16(pBufferOut, sampleData, (size_t)samplesRead, pWav->bytesPerSample);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s16__alaw(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut)
{
    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav_alaw_to_s16(pBufferOut, sampleData, (size_t)samplesRead);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s16__mulaw(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut)
{
    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav_mulaw_to_s16(pBufferOut, sampleData, (size_t)samplesRead);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s16(drwav* pWav, drwav_uint64 samplesToRead, drwav_int16* pBufferOut)
{
    if (pWav == NULL || samplesToRead == 0 || pBufferOut == NULL) {
        return 0;
    }

    // Don't try to read more samples than can potentially fit in the output buffer.
    if (samplesToRead * sizeof(drwav_int16) > SIZE_MAX) {
        samplesToRead = SIZE_MAX / sizeof(drwav_int16);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_PCM) {
        return drwav_read_s16__pcm(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM) {
        return drwav_read_s16__msadpcm(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_IEEE_FLOAT) {
        return drwav_read_s16__ieee(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ALAW) {
        return drwav_read_s16__alaw(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_MULAW) {
        return drwav_read_s16__mulaw(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_DVI_ADPCM) {
        return drwav_read_s16__ima(pWav, samplesToRead, pBufferOut);
    }

    return 0;
}

void drwav_u8_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    int r;
    for (size_t i = 0; i < sampleCount; ++i) {
        int x = pIn[i];
        r = x - 128;
        r = r << 8;
        pOut[i] = (short)r;
    }
}

void drwav_s24_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    int r;
    for (size_t i = 0; i < sampleCount; ++i) {
        int x = ((int)(((unsigned int)(((unsigned char*)pIn)[i*3+0]) << 8) | ((unsigned int)(((unsigned char*)pIn)[i*3+1]) << 16) | ((unsigned int)(((unsigned char*)pIn)[i*3+2])) << 24)) >> 8;
        r = x >> 8;
        pOut[i] = (short)r;
    }
}

void drwav_s32_to_s16(drwav_int16* pOut, const drwav_int32* pIn, size_t sampleCount)
{
    int r;
    for (size_t i = 0; i < sampleCount; ++i) {
        int x = pIn[i];
        r = x >> 16;
        pOut[i] = (short)r;
    }
}

void drwav_f32_to_s16(drwav_int16* pOut, const float* pIn, size_t sampleCount)
{
    int r;
    for (size_t i = 0; i < sampleCount; ++i) {
        float x = pIn[i];
        float c;
        c = ((x < -1) ? -1 : ((x > 1) ? 1 : x));
        c = c + 1;
        r = (int)(c * 32767.5f);
        r = r - 32768;
        pOut[i] = (short)r;
    }
}

void drwav_f64_to_s16(drwav_int16* pOut, const double* pIn, size_t sampleCount)
{
    int r;
    for (size_t i = 0; i < sampleCount; ++i) {
        double x = pIn[i];
        double c;
        c = ((x < -1) ? -1 : ((x > 1) ? 1 : x));
        c = c + 1;
        r = (int)(c * 32767.5);
        r = r - 32768;
        pOut[i] = (short)r;
    }
}

void drwav_alaw_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    for (size_t i = 0; i < sampleCount; ++i) {
        pOut[i] = drwav__alaw_to_s16(pIn[i]);
    }
}

void drwav_mulaw_to_s16(drwav_int16* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    for (size_t i = 0; i < sampleCount; ++i) {
        pOut[i] = drwav__mulaw_to_s16(pIn[i]);
    }
}



static void drwav__pcm_to_f32(float* pOut, const unsigned char* pIn, size_t sampleCount, unsigned short bytesPerSample)
{
    // Special case for 8-bit sample data because it's treated as unsigned.
    if (bytesPerSample == 1) {
        drwav_u8_to_f32(pOut, pIn, sampleCount);
        return;
    }

    // Slightly more optimal implementation for common formats.
    if (bytesPerSample == 2) {
        drwav_s16_to_f32(pOut, (const drwav_int16*)pIn, sampleCount);
        return;
    }
    if (bytesPerSample == 3) {
        drwav_s24_to_f32(pOut, pIn, sampleCount);
        return;
    }
    if (bytesPerSample == 4) {
        drwav_s32_to_f32(pOut, (const drwav_int32*)pIn, sampleCount);
        return;
    }


    // Anything more than 64 bits per sample is not supported.
    if (bytesPerSample > 8) {
        drwav_zero_memory(pOut, sampleCount * sizeof(*pOut));
        return;
    }


    // Generic, slow converter.
    for (unsigned int i = 0; i < sampleCount; ++i) {
        drwav_uint64 sample = 0;
        unsigned int shift  = (8 - bytesPerSample) * 8;

        unsigned int j;
        for (j = 0; j < bytesPerSample && j < 8; j += 1) {
            sample |= (drwav_uint64)(pIn[j]) << shift;
            shift  += 8;
        }

        pIn += j;
        *pOut++ = (float)((drwav_int64)sample / 9223372036854775807.0);
    }
}

static void drwav__ieee_to_f32(float* pOut, const unsigned char* pIn, size_t sampleCount, unsigned short bytesPerSample)
{
    if (bytesPerSample == 4) {
        for (unsigned int i = 0; i < sampleCount; ++i) {
            *pOut++ = ((float*)pIn)[i];
        }
        return;
    } else if (bytesPerSample == 8) {
        drwav_f64_to_f32(pOut, (double*)pIn, sampleCount);
        return;
    } else {
        // Only supporting 32- and 64-bit float. Output silence in all other cases. Contributions welcome for 16-bit float.
        drwav_zero_memory(pOut, sampleCount * sizeof(*pOut));
        return;
    }
}


drwav_uint64 drwav_read_f32__pcm(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut)
{
    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav__pcm_to_f32(pBufferOut, sampleData, (size_t)samplesRead, pWav->bytesPerSample);
        pBufferOut += samplesRead;

        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_f32__msadpcm(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut)
{
    // We're just going to borrow the implementation from the drwav_read_s16() since ADPCM is a little bit more complicated than other formats and I don't
    // want to duplicate that code.
    drwav_uint64 totalSamplesRead = 0;
    drwav_int16 samples16[2048];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read_s16(pWav, drwav_min(samplesToRead, 2048), samples16);
        if (samplesRead == 0) {
            break;
        }

        drwav_s16_to_f32(pBufferOut, samples16, (size_t)samplesRead);   // <-- Safe cast because we're clamping to 2048.

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_f32__ima(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut)
{
    // We're just going to borrow the implementation from the drwav_read_s16() since IMA-ADPCM is a little bit more complicated than other formats and I don't
    // want to duplicate that code.
    drwav_uint64 totalSamplesRead = 0;
    drwav_int16 samples16[2048];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read_s16(pWav, drwav_min(samplesToRead, 2048), samples16);
        if (samplesRead == 0) {
            break;
        }

        drwav_s16_to_f32(pBufferOut, samples16, (size_t)samplesRead);   // <-- Safe cast because we're clamping to 2048.

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_f32__ieee(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut)
{
    // Fast path.
    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_IEEE_FLOAT && pWav->bytesPerSample == 4) {
        return drwav_read(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav__ieee_to_f32(pBufferOut, sampleData, (size_t)samplesRead, pWav->bytesPerSample);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_f32__alaw(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut)
{
    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav_alaw_to_f32(pBufferOut, sampleData, (size_t)samplesRead);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_f32__mulaw(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut)
{
    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav_mulaw_to_f32(pBufferOut, sampleData, (size_t)samplesRead);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_f32(drwav* pWav, drwav_uint64 samplesToRead, float* pBufferOut)
{
    if (pWav == NULL || samplesToRead == 0 || pBufferOut == NULL) {
        return 0;
    }

    // Don't try to read more samples than can potentially fit in the output buffer.
    if (samplesToRead * sizeof(float) > SIZE_MAX) {
        samplesToRead = SIZE_MAX / sizeof(float);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_PCM) {
        return drwav_read_f32__pcm(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM) {
        return drwav_read_f32__msadpcm(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_IEEE_FLOAT) {
        return drwav_read_f32__ieee(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ALAW) {
        return drwav_read_f32__alaw(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_MULAW) {
        return drwav_read_f32__mulaw(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_DVI_ADPCM) {
        return drwav_read_f32__ima(pWav, samplesToRead, pBufferOut);
    }

    return 0;
}

void drwav_u8_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

#ifdef DR_WAV_LIBSNDFILE_COMPAT
    // It appears libsndfile uses slightly different logic for the u8 -> f32 conversion to dr_wav, which in my opinion is incorrect. It appears
    // libsndfile performs the conversion something like "f32 = (u8 / 256) * 2 - 1", however I think it should be "f32 = (u8 / 255) * 2 - 1" (note
    // the divisor of 256 vs 255). I use libsndfile as a benchmark for testing, so I'm therefore leaving this block here just for my automated
    // correctness testing. This is disabled by default.
    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = (pIn[i] / 256.0f) * 2 - 1;
    }
#else
    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = (pIn[i] / 255.0f) * 2 - 1;
    }
#endif
}

void drwav_s16_to_f32(float* pOut, const drwav_int16* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = pIn[i] / 32768.0f;
    }
}

void drwav_s24_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        unsigned int s0 = pIn[i*3 + 0];
        unsigned int s1 = pIn[i*3 + 1];
        unsigned int s2 = pIn[i*3 + 2];

        int sample32 = (int)((s0 << 8) | (s1 << 16) | (s2 << 24));
        *pOut++ = (float)(sample32 / 2147483648.0);
    }
}

void drwav_s32_to_f32(float* pOut, const drwav_int32* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = (float)(pIn[i] / 2147483648.0);
    }
}

void drwav_f64_to_f32(float* pOut, const double* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = (float)pIn[i];
    }
}

void drwav_alaw_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = drwav__alaw_to_s16(pIn[i]) / 32768.0f;
    }
}

void drwav_mulaw_to_f32(float* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = drwav__mulaw_to_s16(pIn[i]) / 32768.0f;
    }
}



static void drwav__pcm_to_s32(drwav_int32* pOut, const unsigned char* pIn, size_t totalSampleCount, unsigned short bytesPerSample)
{
    // Special case for 8-bit sample data because it's treated as unsigned.
    if (bytesPerSample == 1) {
        drwav_u8_to_s32(pOut, pIn, totalSampleCount);
        return;
    }

    // Slightly more optimal implementation for common formats.
    if (bytesPerSample == 2) {
        drwav_s16_to_s32(pOut, (const drwav_int16*)pIn, totalSampleCount);
        return;
    }
    if (bytesPerSample == 3) {
        drwav_s24_to_s32(pOut, pIn, totalSampleCount);
        return;
    }
    if (bytesPerSample == 4) {
        for (unsigned int i = 0; i < totalSampleCount; ++i) {
           *pOut++ = ((drwav_int32*)pIn)[i];
        }
        return;
    }


    // Anything more than 64 bits per sample is not supported.
    if (bytesPerSample > 8) {
        drwav_zero_memory(pOut, totalSampleCount * sizeof(*pOut));
        return;
    }


    // Generic, slow converter.
    for (unsigned int i = 0; i < totalSampleCount; ++i) {
        drwav_uint64 sample = 0;
        unsigned int shift  = (8 - bytesPerSample) * 8;

        unsigned int j;
        for (j = 0; j < bytesPerSample && j < 8; j += 1) {
            sample |= (drwav_uint64)(pIn[j]) << shift;
            shift  += 8;
        }

        pIn += j;
        *pOut++ = (drwav_int32)((drwav_int64)sample >> 32);
    }
}

static void drwav__ieee_to_s32(drwav_int32* pOut, const unsigned char* pIn, size_t totalSampleCount, unsigned short bytesPerSample)
{
    if (bytesPerSample == 4) {
        drwav_f32_to_s32(pOut, (float*)pIn, totalSampleCount);
        return;
    } else if (bytesPerSample == 8) {
        drwav_f64_to_s32(pOut, (double*)pIn, totalSampleCount);
        return;
    } else {
        // Only supporting 32- and 64-bit float. Output silence in all other cases. Contributions welcome for 16-bit float.
        drwav_zero_memory(pOut, totalSampleCount * sizeof(*pOut));
        return;
    }
}


drwav_uint64 drwav_read_s32__pcm(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut)
{
    // Fast path.
    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_PCM && pWav->bytesPerSample == 4) {
        return drwav_read(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav__pcm_to_s32(pBufferOut, sampleData, (size_t)samplesRead, pWav->bytesPerSample);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s32__msadpcm(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut)
{
    // We're just going to borrow the implementation from the drwav_read_s16() since ADPCM is a little bit more complicated than other formats and I don't
    // want to duplicate that code.
    drwav_uint64 totalSamplesRead = 0;
    drwav_int16 samples16[2048];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read_s16(pWav, drwav_min(samplesToRead, 2048), samples16);
        if (samplesRead == 0) {
            break;
        }

        drwav_s16_to_s32(pBufferOut, samples16, (size_t)samplesRead);   // <-- Safe cast because we're clamping to 2048.

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s32__ima(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut)
{
    // We're just going to borrow the implementation from the drwav_read_s16() since IMA-ADPCM is a little bit more complicated than other formats and I don't
    // want to duplicate that code.
    drwav_uint64 totalSamplesRead = 0;
    drwav_int16 samples16[2048];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read_s16(pWav, drwav_min(samplesToRead, 2048), samples16);
        if (samplesRead == 0) {
            break;
        }

        drwav_s16_to_s32(pBufferOut, samples16, (size_t)samplesRead);   // <-- Safe cast because we're clamping to 2048.

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s32__ieee(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut)
{
    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav__ieee_to_s32(pBufferOut, sampleData, (size_t)samplesRead, pWav->bytesPerSample);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s32__alaw(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut)
{
    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav_alaw_to_s32(pBufferOut, sampleData, (size_t)samplesRead);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s32__mulaw(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut)
{
    if (pWav->bytesPerSample == 0) {
        return 0;
    }

    drwav_uint64 totalSamplesRead = 0;
    unsigned char sampleData[4096];
    while (samplesToRead > 0) {
        drwav_uint64 samplesRead = drwav_read(pWav, drwav_min(samplesToRead, sizeof(sampleData)/pWav->bytesPerSample), sampleData);
        if (samplesRead == 0) {
            break;
        }

        drwav_mulaw_to_s32(pBufferOut, sampleData, (size_t)samplesRead);

        pBufferOut       += samplesRead;
        samplesToRead    -= samplesRead;
        totalSamplesRead += samplesRead;
    }

    return totalSamplesRead;
}

drwav_uint64 drwav_read_s32(drwav* pWav, drwav_uint64 samplesToRead, drwav_int32* pBufferOut)
{
    if (pWav == NULL || samplesToRead == 0 || pBufferOut == NULL) {
        return 0;
    }

    // Don't try to read more samples than can potentially fit in the output buffer.
    if (samplesToRead * sizeof(drwav_int32) > SIZE_MAX) {
        samplesToRead = SIZE_MAX / sizeof(drwav_int32);
    }


    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_PCM) {
        return drwav_read_s32__pcm(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ADPCM) {
        return drwav_read_s32__msadpcm(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_IEEE_FLOAT) {
        return drwav_read_s32__ieee(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_ALAW) {
        return drwav_read_s32__alaw(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_MULAW) {
        return drwav_read_s32__mulaw(pWav, samplesToRead, pBufferOut);
    }

    if (pWav->translatedFormatTag == DR_WAVE_FORMAT_DVI_ADPCM) {
        return drwav_read_s32__ima(pWav, samplesToRead, pBufferOut);
    }

    return 0;
}

void drwav_u8_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = ((int)pIn[i] - 128) << 24;
    }
}

void drwav_s16_to_s32(drwav_int32* pOut, const drwav_int16* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = pIn[i] << 16;
    }
}

void drwav_s24_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        unsigned int s0 = pIn[i*3 + 0];
        unsigned int s1 = pIn[i*3 + 1];
        unsigned int s2 = pIn[i*3 + 2];

        drwav_int32 sample32 = (drwav_int32)((s0 << 8) | (s1 << 16) | (s2 << 24));
        *pOut++ = sample32;
    }
}

void drwav_f32_to_s32(drwav_int32* pOut, const float* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = (drwav_int32)(2147483648.0 * pIn[i]);
    }
}

void drwav_f64_to_s32(drwav_int32* pOut, const double* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = (drwav_int32)(2147483648.0 * pIn[i]);
    }
}

void drwav_alaw_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i = 0; i < sampleCount; ++i) {
        *pOut++ = ((drwav_int32)drwav__alaw_to_s16(pIn[i])) << 16;
    }
}

void drwav_mulaw_to_s32(drwav_int32* pOut, const drwav_uint8* pIn, size_t sampleCount)
{
    if (pOut == NULL || pIn == NULL) {
        return;
    }

    for (size_t i= 0; i < sampleCount; ++i) {
        *pOut++ = ((drwav_int32)drwav__mulaw_to_s16(pIn[i])) << 16;
    }
}



drwav_int16* drwav__read_and_close_s16(drwav* pWav, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    drwav_assert(pWav != NULL);

    drwav_uint64 sampleDataSize = pWav->totalSampleCount * sizeof(drwav_int16);
    if (sampleDataSize > SIZE_MAX) {
        drwav_uninit(pWav);
        return NULL;    // File's too big.
    }

    drwav_int16* pSampleData = (drwav_int16*)DRWAV_MALLOC((size_t)sampleDataSize);    // <-- Safe cast due to the check above.
    if (pSampleData == NULL) {
        drwav_uninit(pWav);
        return NULL;    // Failed to allocate memory.
    }

    drwav_uint64 samplesRead = drwav_read_s16(pWav, (size_t)pWav->totalSampleCount, pSampleData);
    if (samplesRead != pWav->totalSampleCount) {
        DRWAV_FREE(pSampleData);
        drwav_uninit(pWav);
        return NULL;    // There was an error reading the samples.
    }

    drwav_uninit(pWav);

    if (sampleRate) *sampleRate = pWav->sampleRate;
    if (channels) *channels = pWav->channels;
    if (totalSampleCount) *totalSampleCount = pWav->totalSampleCount;
    return pSampleData;
}

float* drwav__read_and_close_f32(drwav* pWav, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    drwav_assert(pWav != NULL);

    drwav_uint64 sampleDataSize = pWav->totalSampleCount * sizeof(float);
    if (sampleDataSize > SIZE_MAX) {
        drwav_uninit(pWav);
        return NULL;    // File's too big.
    }

    float* pSampleData = (float*)DRWAV_MALLOC((size_t)sampleDataSize);    // <-- Safe cast due to the check above.
    if (pSampleData == NULL) {
        drwav_uninit(pWav);
        return NULL;    // Failed to allocate memory.
    }

    drwav_uint64 samplesRead = drwav_read_f32(pWav, (size_t)pWav->totalSampleCount, pSampleData);
    if (samplesRead != pWav->totalSampleCount) {
        DRWAV_FREE(pSampleData);
        drwav_uninit(pWav);
        return NULL;    // There was an error reading the samples.
    }

    drwav_uninit(pWav);

    if (sampleRate) *sampleRate = pWav->sampleRate;
    if (channels) *channels = pWav->channels;
    if (totalSampleCount) *totalSampleCount = pWav->totalSampleCount;
    return pSampleData;
}

drwav_int32* drwav__read_and_close_s32(drwav* pWav, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    drwav_assert(pWav != NULL);

    drwav_uint64 sampleDataSize = pWav->totalSampleCount * sizeof(drwav_int32);
    if (sampleDataSize > SIZE_MAX) {
        drwav_uninit(pWav);
        return NULL;    // File's too big.
    }

    drwav_int32* pSampleData = (drwav_int32*)DRWAV_MALLOC((size_t)sampleDataSize);    // <-- Safe cast due to the check above.
    if (pSampleData == NULL) {
        drwav_uninit(pWav);
        return NULL;    // Failed to allocate memory.
    }

    drwav_uint64 samplesRead = drwav_read_s32(pWav, (size_t)pWav->totalSampleCount, pSampleData);
    if (samplesRead != pWav->totalSampleCount) {
        DRWAV_FREE(pSampleData);
        drwav_uninit(pWav);
        return NULL;    // There was an error reading the samples.
    }

    drwav_uninit(pWav);

    if (sampleRate) *sampleRate = pWav->sampleRate;
    if (channels) *channels = pWav->channels;
    if (totalSampleCount) *totalSampleCount = pWav->totalSampleCount;
    return pSampleData;
}


drwav_int16* drwav_open_and_read_s16(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init(&wav, onRead, onSeek, pUserData)) {
        return NULL;
    }

    return drwav__read_and_close_s16(&wav, channels, sampleRate, totalSampleCount);
}

float* drwav_open_and_read_f32(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init(&wav, onRead, onSeek, pUserData)) {
        return NULL;
    }

    return drwav__read_and_close_f32(&wav, channels, sampleRate, totalSampleCount);
}

drwav_int32* drwav_open_and_read_s32(drwav_read_proc onRead, drwav_seek_proc onSeek, void* pUserData, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init(&wav, onRead, onSeek, pUserData)) {
        return NULL;
    }

    return drwav__read_and_close_s32(&wav, channels, sampleRate, totalSampleCount);
}

#ifndef DR_WAV_NO_STDIO
drwav_int16* drwav_open_and_read_file_s16(const char* filename, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init_file(&wav, filename)) {
        return NULL;
    }

    return drwav__read_and_close_s16(&wav, channels, sampleRate, totalSampleCount);
}

float* drwav_open_and_read_file_f32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init_file(&wav, filename)) {
        return NULL;
    }

    return drwav__read_and_close_f32(&wav, channels, sampleRate, totalSampleCount);
}

drwav_int32* drwav_open_and_read_file_s32(const char* filename, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init_file(&wav, filename)) {
        return NULL;
    }

    return drwav__read_and_close_s32(&wav, channels, sampleRate, totalSampleCount);
}
#endif

drwav_int16* drwav_open_and_read_memory_s16(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init_memory(&wav, data, dataSize)) {
        return NULL;
    }

    return drwav__read_and_close_s16(&wav, channels, sampleRate, totalSampleCount);
}

float* drwav_open_and_read_memory_f32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init_memory(&wav, data, dataSize)) {
        return NULL;
    }

    return drwav__read_and_close_f32(&wav, channels, sampleRate, totalSampleCount);
}

drwav_int32* drwav_open_and_read_memory_s32(const void* data, size_t dataSize, unsigned int* channels, unsigned int* sampleRate, drwav_uint64* totalSampleCount)
{
    if (sampleRate) *sampleRate = 0;
    if (channels) *channels = 0;
    if (totalSampleCount) *totalSampleCount = 0;

    drwav wav;
    if (!drwav_init_memory(&wav, data, dataSize)) {
        return NULL;
    }

    return drwav__read_and_close_s32(&wav, channels, sampleRate, totalSampleCount);
}
#endif  //DR_WAV_NO_CONVERSION_API


void drwav_free(void* pDataReturnedByOpenAndRead)
{
    DRWAV_FREE(pDataReturnedByOpenAndRead);
}

#endif  //DR_WAV_IMPLEMENTATION


// REVISION HISTORY
//
// v0.7f - 2018-02-05
//   - Restrict ADPCM formats to a maximum of 2 channels.
//
// v0.7e - 2018-02-02
//   - Fix a crash.
//
// v0.7d - 2018-02-01
//   - Fix a crash.
//
// v0.7c - 2018-02-01
//   - Set drwav.bytesPerSample to 0 for all compressed formats.
//   - Fix a crash when reading 16-bit floating point WAV files. In this case dr_wav will output silence for
//     all format conversion reading APIs (*_s16, *_s32, *_f32 APIs).
//   - Fix some divide-by-zero errors.
//
// v0.7b - 2018-01-22
//   - Fix errors with seeking of compressed formats.
//   - Fix compilation error when DR_WAV_NO_CONVERSION_API
//
// v0.7a - 2017-11-17
//   - Fix some GCC warnings.
//
// v0.7 - 2017-11-04
//   - Add writing APIs.
//
// v0.6 - 2017-08-16
//   - API CHANGE: Rename dr_* types to drwav_*.
//   - Add support for custom implementations of malloc(), realloc(), etc.
//   - Add support for Microsoft ADPCM.
//   - Add support for IMA ADPCM (DVI, format code 0x11).
//   - Optimizations to drwav_read_s16().
//   - Bug fixes.
//
// v0.5g - 2017-07-16
//   - Change underlying type for booleans to unsigned.
//
// v0.5f - 2017-04-04
//   - Fix a minor bug with drwav_open_and_read_s16() and family.
//
// v0.5e - 2016-12-29
//   - Added support for reading samples as signed 16-bit integers. Use the _s16() family of APIs for this.
//   - Minor fixes to documentation.
//
// v0.5d - 2016-12-28
//   - Use drwav_int*/drwav_uint* sized types to improve compiler support.
//
// v0.5c - 2016-11-11
//   - Properly handle JUNK chunks that come before the FMT chunk.
//
// v0.5b - 2016-10-23
//   - A minor change to drwav_bool8 and drwav_bool32 types.
//
// v0.5a - 2016-10-11
//   - Fixed a bug with drwav_open_and_read() and family due to incorrect argument ordering.
//   - Improve A-law and mu-law efficiency.
//
// v0.5 - 2016-09-29
//   - API CHANGE. Swap the order of "channels" and "sampleRate" parameters in drwav_open_and_read*(). Rationale for this is to
//     keep it consistent with dr_audio and dr_flac.
//
// v0.4b - 2016-09-18
//   - Fixed a typo in documentation.
//
// v0.4a - 2016-09-18
//   - Fixed a typo.
//   - Change date format to ISO 8601 (YYYY-MM-DD)
//
// v0.4 - 2016-07-13
//   - API CHANGE. Make onSeek consistent with dr_flac.
//   - API CHANGE. Rename drwav_seek() to drwav_seek_to_sample() for clarity and consistency with dr_flac.
//   - Added support for Sony Wave64.
//
// v0.3a - 2016-05-28
//   - API CHANGE. Return drwav_bool32 instead of int in onSeek callback.
//   - Fixed a memory leak.
//
// v0.3 - 2016-05-22
//   - Lots of API changes for consistency.
//
// v0.2a - 2016-05-16
//   - Fixed Linux/GCC build.
//
// v0.2 - 2016-05-11
//   - Added support for reading data as signed 32-bit PCM for consistency with dr_flac.
//
// v0.1a - 2016-05-07
//   - Fixed a bug in drwav_open_file() where the file handle would not be closed if the loader failed to initialize.
//
// v0.1 - 2016-05-04
//   - Initial versioned release.


/*
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