NO IMAGE

ffmepg解碼音訊。

#import "FFMpegAudioDecoder.h"
#ifdef __cplusplus
extern "C" {
#endif
#include <libavutil/opt.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#ifdef __cplusplus
};
#endif
@interface FFMpegAudioDecoder(){
AVCodec *_audioCodec;
AVCodecContext *_pCodecCtx;
AVFrame *_pFrame;
char* _pcmBuf;
}
@end
@implementation FFMpegAudioDecoder
-(int)intDecoder{
av_register_all();
//NSString* codecName = @"libfdk_aac";
//_audioCodec = avcodec_find_decoder_by_name([codecName UTF8String]);
_audioCodec = avcodec_find_decoder(AV_CODEC_ID_AAC);
_pCodecCtx = avcodec_alloc_context3(_audioCodec);
if (!_audioCodec)
return -1;
_pCodecCtx->codec_id = AV_CODEC_ID_AAC;
_pCodecCtx->codec_type = AVMEDIA_TYPE_AUDIO;
if(avcodec_open2(_pCodecCtx, _audioCodec,NULL) >= 0)
_pFrame = av_frame_alloc();// Allocate video frame
else
return -1;
return 0;
}
-(int)decode:(char*)pktaudio len:(int)len{
AVPacket pkt = {
.data = (uint8_t*)pktaudio,
.size = len,
};
int got_frame = 0;
int decLen = avcodec_decode_audio4(_pCodecCtx, _pFrame, &got_frame, &pkt);
if (!got_frame) {
NSLog(@"avcodec_decode_audio4 failed .");
return -1;
}
NSLog(@"avcodec_decode_audio4 succ len : %d",decLen);
return 0;
}
-(void)free{
if(_pCodecCtx){
avcodec_close(_pCodecCtx);
_audioCodec = NULL;
}
if (_pFrame) {
av_frame_free(&_pFrame);
_pFrame = NULL;
}
if (_pcmBuf) {
free(_pcmBuf);
_pcmBuf = NULL;
}
}
@end