Hello! My name is Lars Quentmeier and I'm trying to write a theora-player.
Video is already showing up, but unfortunately I can't get my Vorbis-Decoder
to work correctly. Could you perhaps help me? My decoding function looks like
this:
int
VorbisDecoder::getAudioData(char* audiobuf, int fragsize){
// single audio fragment audio buffering
bool audiobufReady = false;
int size=0;
int audiobufFill = 0;
while(!audiobufReady){
//1)try to decode some data
while(!audiobufReady){
float **pcm;
//if there's pending, decoded audio, grab it
if((size=vorbis_synthesis_pcmout(&vorbisDspState,&pcm))>0){
int count=audiobufFill/2;
int maxsamples=(fragsize-audiobufFill)/vorbisInfo.channels/2;// /2
int i;
for(i=0; i<size && i<maxsamples; i++){
for(int j=0;j<vorbisInfo.channels;j++){
int val=(int) (pcm[j][i]*32767.f);
if(val>32767) val=32767;
if(val<-32768) val=-32768;
audiobuf[count++]=val;
}
}
vorbis_synthesis_read(&vorbisDspState,i);
audiobufFill += i*vorbisInfo.channels*2;
if (audiobufFill == fragsize) audiobufReady = true;
} else {
// no pending audio; is there a pending packet to decode?
if(ogg_stream_packetout(&oggStreamState,&oggPacket)>0){
if(vorbis_synthesis(&vorbisBlock,&oggPacket)==0) // test for
success!
vorbis_synthesis_blockin(&vorbisDspState,&vorbisBlock);
}else{ // we need more data; break out to suck in another page
break;
}
}
}
//1)grab new data
if(!audiobufReady){
/* no data yet for somebody. Grab another page */
if(!source->requestData()) return 0;
while(ogg_sync_pageout(&oggSyncState,&oggPage)>0)
{
ogg_stream_pagein(&oggStreamState, &oggPage);
}
}
}
return audiobufFill;
}
It would be really nice if somebody could give me a hint.
Greetings Lars
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