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alac_wrapper.cpp
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alac_wrapper.cpp
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/*
* alac_wrapper.c - ALAC decoder wrapper
*
* (c) Philippe, [email protected]
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdlib.h>
#include "ALACDecoder.h"
#include "ALACBitUtilities.h"
#include "alac_wrapper.h"
typedef struct alac_codec_s {
ALACDecoder *Decoder;
unsigned block_size, frames_per_packet;
} alac_codec_t;
/*----------------------------------------------------------------------------*/
extern "C" struct alac_codec_s *alac_create_decoder(int magic_cookie_size, unsigned char *magic_cookie,
unsigned char *sample_size, unsigned *sample_rate,
unsigned char *channels) {
struct alac_codec_s *codec = (struct alac_codec_s*) malloc(sizeof(struct alac_codec_s));
codec->Decoder = new ALACDecoder;
codec->Decoder->Init(magic_cookie, magic_cookie_size);
*channels = codec->Decoder->mConfig.numChannels;
*sample_rate = codec->Decoder->mConfig.sampleRate;
*sample_size = codec->Decoder->mConfig.bitDepth;
codec->frames_per_packet = codec->Decoder->mConfig.frameLength;
codec->block_size = codec->frames_per_packet * (*channels) * (*sample_size) / 8;
return codec;
}
/*----------------------------------------------------------------------------*/
extern "C" void alac_delete_decoder(struct alac_codec_s *codec) {
delete (ALACDecoder*) codec->Decoder;
free(codec);
}
/*----------------------------------------------------------------------------*/
extern "C" bool alac_to_pcm(struct alac_codec_s *codec, unsigned char* input,
unsigned char *output, char channels, unsigned *out_frames) {
BitBuffer input_buffer;
BitBufferInit(&input_buffer, input, codec->block_size);
return codec->Decoder->Decode(&input_buffer, output, codec->frames_per_packet, channels, out_frames) == ALAC_noErr;
}