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//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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