AAC 音频解码类

写全各类编码编解码

h264编码

AAC解码 1、声明

#define out_sample_fmt	AV_SAMPLE_FMT_S16
#define out_channels	2

class AACDecode
{
public:
	AACDecode();
	~AACDecode();

	int  DoInit();
	void DoUnInit();
	bool decodeAACAudio(char *buff, unsigned int buffLen, unsigned int &audioLen);
	
	AVCodecContext* GetContext(){
		return _codecCtx;
	}
	uint8_t *getAudioChunk(){
		return dst_data[0];
	}
private:
//	FFMPEGLibrary _ffmpeg;
	int64_t src_ch_layout = AV_CH_LAYOUT_STEREO, dst_ch_layout = AV_CH_LAYOUT_SURROUND;
	int src_rate = 44100, dst_rate = 44100;
	int src_nb_samples = 1024;
	int dst_nb_samples, max_dst_nb_samples;
	int dst_nb_channels = 0;
	uint8_t **dst_data = NULL;
	int dst_linesize;
	//uint8_t *_audioChunk = nullptr;

	AVCodec *_codec;
	AVCodecContext *_codecCtx;
	AVFrame* _outputFrame;
	SwrContext * _swrCtx = NULL;

	int AudioResampling();
};

2、实现

#include "AACDecode.h"


AACDecode::AACDecode()
{
}


AACDecode::~AACDecode()
{
}

int AACDecode::DoInit()
{
	FFMPEGLibraryInstance.Load();
	if (!FFMPEGLibraryInstance.IsLoaded()){
		return -1;
	}

	if ((_codec = FFMPEGLibraryInstance.AvcodecFindDecoder(AV_CODEC_ID_AAC)) == NULL) {
		return false;
	}

	_codecCtx = FFMPEGLibraryInstance.AvcodecAllocContext(_codec);
	if (_codecCtx == NULL) {
		return false;
	}

	if (FFMPEGLibraryInstance.AvcodecOpen(_codecCtx, _codec)