Audio.h

#pragma once
#include "PacketQueue.h"
extern "C" {

#include <libavformat/avformat.h>

}
class Audio 
{
	 
public:
	Audio();
	~Audio();
	const uint32_t BUFFERSIZE = 192000;// 缓冲区的大小									   
	bool audioPlay();//音频播放                            
	bool audioClose();//音频关闭
	double getCurrentAudioClock();//获取当前音频时钟
	int getStreamIndex();
	void setStreamIndex(const int streamIndex);
	int getAudioQueueSize();
	void enqueuePacket(const AVPacket pkt);
	AVPacket dequeuePacket();
	uint8_t* getAudioBuff();
	void setAudioBuff(uint8_t*& audioBuff);
	uint32_t getAudioBuffSize();
	void setAudioBuffSize(uint32_t audioBuffSize);
	uint32_t getAudioBuffIndex();
	void setAudioBuffIndex(uint32_t audioBuffIndex);
	double getAudioClock();
	void setAudioClock(const double &audioClock);
	AVStream *getStream();
	void setStream(AVStream *&stream);
	AVCodecContext *getAVCodecContext();//获取音频解码器上下文
	void setAVCodecContext(AVCodecContext *audioContext);
	bool getIsPlaying();
	void setPlaying(bool isPlaying);
	void clearPacket();
	void setVolume(int volume);
private:
	
	AVCodecContext *audioContext;//音频解码器上下文
	AVStream *stream;   //音频流
	double audioClock; // audio clock
	PacketQueue audiaPackets;
	uint8_t *audioBuff;       // 解码后数据的缓冲空间
	uint32_t audioBuffSize;  // buffer中的字节数
	uint32_t audioBuffIndex; // buffer中未发送数据的index
	int streamIndex = -1;
	bool isPlay = false;

};
/**
* 向设备发送audio数据的回调函数
*/
void audioCallback(void* userdata, Uint8 *stream, int len);

/**
* 解码Avpacket中的数据填充到缓冲空间
*/
int audioDecodeFrame(Audio*audio, uint8_t *audioBuffer, int bufferSize);