diff options
Diffstat (limited to 'avcodec_audio_example2.c')
| -rw-r--r-- | avcodec_audio_example2.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/avcodec_audio_example2.c b/avcodec_audio_example2.c new file mode 100644 index 0000000..6546d3f --- /dev/null +++ b/avcodec_audio_example2.c @@ -0,0 +1,143 @@ +//this seems to be obsolete!!!!!!!!!!!!!!!!! + + + + +bool Render_context::load_audio(string &filename){ + //load audio into memory and create thumbnail + + av_register_all(); + avcodec_register_all(); + //av_register_all(); + //av_ini + + AVFormatContext* container=avformat_alloc_context(); + if(avformat_open_input(&container,filename.c_str(),NULL,NULL)<0){ + cerr << "Could not open file" << endl; + return false; + } + +//header in avformat.h definition in utils.c in ffmpeg/libavformat +//int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options) +//set input or dictionary?? + + + if(av_find_stream_info(container)<0){ + cerr << "Could not find file info"<< endl; + return false; + } + + //added to try and locate missing audio streams + //container->flags |= AVFMT_FLAG_NONBLOCK; + // + cerr << "found " << container->nb_streams << " streams" << endl; + av_dump_format(container,0,filename.c_str(),false); + cerr << "found " << container->nb_streams << " streams" << endl; + + //typedef struct AVFormatContext { + // unsigned int nb_streams; + //AVStream **streams; + /** + * A list of all streams in the file. New streams are created with + * avformat_new_stream(). + * + * decoding: streams are created by libavformat in avformat_open_input(). + * If AVFMTCTX_NOHEADER is set in ctx_flags, thandroid on linux i386en new streams may also + * appear in av_read_frame(). + * encoding: streams are created by the user before avformat_write_header(). + */ + + int stream_id=-1; + int i; + for(i=0;i<container->nb_streams;i++){ + cerr << "stream " << i << ": codec type " << container->streams[i]->codec->codec_type << endl; + if(container->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){ + stream_id=i; + break; + } + } + if(stream_id==-1){ + cerr << "Could not find Audio Stream"<< endl; + return false; + } + + AVDictionary *metadata=container->metadata; + + AVCodecContext *ctx=container->streams[stream_id]->codec; + AVCodec *codec=avcodec_find_decoder(ctx->codec_id); + + if(codec==NULL){ + cerr <<"cannot find codec!"<< endl; + return false; + } + + if(avcodec_open(ctx,codec)<0){ + cerr <<"Codec cannot be found"<< endl; + return false; + } + + //ctx=avcodec_alloc_context3(codec); + + AVSampleFormat sfmt=ctx->sample_fmt; + if(sfmt==AV_SAMPLE_FMT_U8){ + printf("U8\n"); + + //sformat.bits=8; + }else if(sfmt==AV_SAMPLE_FMT_S16){ + printf("S16\n"); + //sformat.bits=16; + }else if(sfmt==AV_SAMPLE_FMT_S32){ + printf("S32\n"); + //sformat.bits=32; + } + + // sformat.channels=ctx->channels; + // sformat.rate=ctx->sample_rate; + // sformat.byte_format=AO_FMT_NATIVE; +// sformat.matrix=0; + + + + AVPacket packet; + av_init_packet(&packet); + + AVFrame *frame=avcodec_alloc_frame(); + + + + int buffer_size=AVCODEC_MAX_AUDIO_FRAME_SIZE+ FF_INPUT_BUFFER_PADDING_SIZE;; + uint8_t buffer[buffer_size]; + packet.data=buffer; + packet.size =buffer_size; + + + + int len; + int frameFinished=0; + while(av_read_frame(container,&packet)>=0) + { + + if(packet.stream_index==stream_id){ + //printf("Audio Frame read \n"); + int len=avcodec_decode_audio4(ctx,frame,&frameFinished,&packet); + //frame-> + if(frameFinished){ + //printf("Finished reading Frame len : %d , nb_samples:%d buffer_size:%d line size: %d \n",len,frame->nb_samples,buffer_size,frame->linesize[0]); + //ao_play(adevice, (char*)frame->extended_data[0],frame->linesize[0] ); + + //DO SOMETHING WITH THE DATA HERE + }else{ + //printf("Not Finished\n"); + } + + }else { + cerr << "Avcodec found some other packet possibly Video\n"; + } + + + } + + av_close_input_file(container); + + return true; +}
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