FFmpeg_13_音频解码

extern "C" { #include "libavformat\avformat.h" }; int AudioPacketDecode(AVPacket pPacket,int got_frame_ptr,int AudioIndex,AVCodecContext* pCodecContext,AVFrame* pFrame,FILE* f_pcm) { int ReturnValue = pPacket.size; got_frame_ptr = 0; if(pPacket.stream_index == AudioIndex) { int Result = avcodec_decode_audio4(pCodecContext,pFrame,&got_frame_ptr,&pPacket); if(Result< 0) return Result; ReturnValue = FFMIN(Result,pPacket.size); if(got_frame_ptr) { size_t unpadded_linesize = pFrame->nb_samples * av_get_bytes_per_sample(AV_SAMPLE_FMT_S16); fwrite(pFrame->extended_data[0],1,unpadded_linesize,f_pcm); } } return ReturnValue; } int AudioDecode(char* AudioName,int ProgramNumber,char* PcmName) { AVFormatContext* pFormatContext = NULL; if(avformat_open_input(&pFormatContext,AudioName,NULL,NULL) < 0) return -1; if(avformat_find_stream_info(pFormatContext,NULL) < 0) { avformat_close_input(&pFormatContext); return -2; } int AudioIndex = -1; for(int i=0;i<pFormatContext->nb_programs;i++) { if(pFormatContext->programs[i]->id == ProgramNumber) { for(int j=0;j<pFormatContext->programs[i]->nb_stream_indexes;j++) { if(pFormatContext->streams[pFormatContext->programs[i]->stream_index[j]]->codec->codec_type == AVMEDIA_TYPE_AUDIO) AudioIndex = pFormatContext->programs[i]->stream_index[j]; } } } if(AudioIndex == -1) { avformat_close_input(&pFormatContext); return -3; } AVCodecContext* pCodecContext = NULL; pCodecContext = pFormatContext->streams[AudioIndex]->codec; AVCodec* pCodec = NULL; pCodec = avcodec_find_decoder(pCodecContext->codec_id); if(!pCodec) { avformat_close_input(&pFormatContext); return -4; } if(avcodec_open2(pCodecContext,pCodec,NULL) < 0) { avformat_close_input(&pFormatContext); return -5; } AVFrame* pFrame = NULL; pFrame = av_frame_alloc(); if(!pFrame) { avcodec_close(pCodecContext); avformat_close_input(&pFormatContext); return -6; } AVPacket pPacket; av_init_packet(&pPacket); pPacket.data = NULL; pPacket.size = 0; FILE* f_pcm = fopen(PcmName,"wb"); if(f_pcm == NULL) { av_frame_free(&pFrame); avcodec_close(pCodecContext); avformat_close_input(&pFormatContext); return -7; } int ReturnValue = 0; int got_frame_ptr = 0; while(av_read_frame(pFormatContext,&pPacket) >= 0) { AVPacket pPacketTemp = pPacket; do { ReturnValue = AudioPacketDecode(pPacket,got_frame_ptr,AudioIndex,pCodecContext,pFrame,f_pcm); if(ReturnValue < 0) break; pPacket.data += ReturnValue; pPacket.size -= ReturnValue; }while(pPacket.size > 0); av_free_packet(&pPacketTemp); } pPacket.data = NULL; pPacket.size = 0; do { AudioPacketDecode(pPacket,got_frame_ptr,AudioIndex,pCodecContext,pFrame,f_pcm); }while(got_frame_ptr); fclose(f_pcm); av_frame_free(&pFrame); avcodec_close(pCodecContext); avformat_close_input(&pFormatContext); return 0; } int main() { av_register_all(); int ReturnValue = AudioDecode("test_1.ts",1,"decode_1.pcm"); printf("ReturnValue = %d\n",ReturnValue); system("PAUSE"); return 0; }