int main(void)
{
PABLIO_Stream *outStream;
OpenAudioStream(&outStream, SAMPLE_RATE, paFloat32, PABLIO_WRITE|PABLIO_MONO);
while(1) { // synthesize and output samples forever
before = GetAudioStreamWriteable(outStream);
WriteAudioStream(outStream, &buffer, NUM_FRAMES);
after = GetAudioStreamWriteable(outStream);
printf("%ld, %ld\n", before, after);
sleep(2);
}
}
int main( int argc, char* argv[] ){
int i,j;
ogg_packet op;
SDL_Event event;
int hasdatatobuffer = 1;
int playbackdone = 0;
double now, delay, last_frame_time = 0;
int frameNum=0;
int skipNum=0;
/* takes first argument as file to play */
/* this works better on Windows and is more convenient
for drag and drop ogg files over the .exe */
if( argc != 2 )
{
usage();
exit(0);
}
infile = fopen( argv[1], "rb" );
/* start up Ogg stream synchronization layer */
ogg_sync_init(&oy);
/* init supporting Vorbis structures needed in header parsing */
vorbis_info_init(&vi);
vorbis_comment_init(&vc);
/* init supporting Theora structures needed in header parsing */
theora_comment_init(&tc);
theora_info_init(&ti);
parseHeaders();
/* force audio off */
/* vorbis_p = 0; */
/* initialize decoders */
if(theora_p){
theora_decode_init(&td,&ti);
printf("Ogg logical stream %x is Theora %dx%d %.02f fps video\n"
" Frame content is %dx%d with offset (%d,%d).\n",
to.serialno,ti.width,ti.height, (double)ti.fps_numerator/ti.fps_denominator,
ti.frame_width, ti.frame_height, ti.offset_x, ti.offset_y);
report_colorspace(&ti);
dump_comments(&tc);
}else{
/* tear down the partial theora setup */
theora_info_clear(&ti);
theora_comment_clear(&tc);
}
if(vorbis_p){
vorbis_synthesis_init(&vd,&vi);
vorbis_block_init(&vd,&vb);
printf("Ogg logical stream %x is Vorbis %d channel %d Hz audio.\n",
vo.serialno,vi.channels,vi.rate);
}else{
/* tear down the partial vorbis setup */
vorbis_info_clear(&vi);
vorbis_comment_clear(&vc);
}
/* open audio */
if(vorbis_p)open_audio();
/* open video */
if(theora_p)open_video();
/* our main loop */
while(!playbackdone){
/* break out on SDL quit event */
if ( SDL_PollEvent ( &event ) )
{
if ( event.type == SDL_QUIT ) break ;
}
/* get some audio data */
while(vorbis_p && !audiobuf_ready){
int ret;
float **pcm;
int count = 0;
int maxBytesToWrite;
/* is there pending audio? does it fit our circular buffer without blocking? */
ret=vorbis_synthesis_pcmout(&vd,&pcm);
maxBytesToWrite = GetAudioStreamWriteable(aOutStream);
if (maxBytesToWrite<=FRAMES_PER_BUFFER){
/* break out until there is a significant amount of
data to avoid a series of small write operations. */
break;
}
/* if there's pending, decoded audio, grab it */
if((ret>0)&&(maxBytesToWrite>0)){
for(i=0;i<ret && i<(maxBytesToWrite/vi.channels);i++)
for(j=0;j<vi.channels;j++){
int val=(int)(pcm[j][i]*32767.f);
if(val>32767)val=32767;
if(val<-32768)val=-32768;
samples[count]=val;
count++;
}
if(WriteAudioStream( aOutStream, samples, i )) {
if(count==maxBytesToWrite){
audiobuf_ready=1;
}
}
vorbis_synthesis_read(&vd,i);
if(vd.granulepos>=0)
audiobuf_granulepos=vd.granulepos-ret+i;
else
audiobuf_granulepos+=i;
}else{
/* no pending audio; is there a pending packet to decode? */
if(ogg_stream_packetout(&vo,&op)>0){
if(vorbis_synthesis(&vb,&op)==0) /* test for success! */
vorbis_synthesis_blockin(&vd,&vb);
}else /* we need more data; break out to suck in another page */
break;
}
} /* end audio cycle */
while(theora_p && !videobuf_ready){
/* get one video packet... */
if(ogg_stream_packetout(&to,&op)>0){
theora_decode_packetin(&td,&op);
videobuf_granulepos=td.granulepos;
videobuf_time=theora_granule_time(&td,videobuf_granulepos);
/* update the frame counter */
frameNum++;
/* check if this frame time has not passed yet.
If the frame is late we need to decode additonal
ones and keep looping, since theora at this stage
needs to decode all frames */
now=get_time();
delay=videobuf_time-now;
if(delay>=0.0){
/* got a good frame, not late, ready to break out */
videobuf_ready=1;
}else if(now-last_frame_time>=1.0){
/* display at least one frame per second, regardless */
videobuf_ready=1;
}else{
fprintf(stderr, "dropping frame %d (%.3fs behind)\n",
frameNum, -delay);
}
}else{
/* need more data */
break;
}
}
if(!hasdatatobuffer && !videobuf_ready && !audiobuf_ready){
isPlaying = 0;
playbackdone = 1;
}
/* if we're set for the next frame, sleep */
if((!theora_p || videobuf_ready) &&
(!vorbis_p || audiobuf_ready)){
int ticks = 1.0e3*(videobuf_time-get_time());
if(ticks>0)
SDL_Delay(ticks);
}
if(videobuf_ready){
/* time to write our cached frame */
video_write();
videobuf_ready=0;
last_frame_time=get_time();
/* if audio has not started (first frame) then start it */
if ((!isPlaying)&&(vorbis_p)){
start_audio();
isPlaying = 1;
}
}
/* HACK: always look for more audio data */
audiobuf_ready=0;
/* buffer compressed data every loop */
if(hasdatatobuffer){
hasdatatobuffer=buffer_data(&oy);
if(hasdatatobuffer==0){
printf("Ogg buffering stopped, end of file reached.\n");
}
}
if (ogg_sync_pageout(&oy,&og)>0){
queue_page(&og);
}
} /* playbackdone */
/* show number of video frames decoded */
printf( "\n");
printf( "Frames decoded: %d", frameNum );
if(skipNum)
printf( " (only %d shown)", frameNum-skipNum);
printf( "\n" );
/* tear it all down */
fclose( infile );
if(vorbis_p){
audio_close();
ogg_stream_clear(&vo);
vorbis_block_clear(&vb);
vorbis_dsp_clear(&vd);
vorbis_comment_clear(&vc);
vorbis_info_clear(&vi);
}
if(theora_p){
ogg_stream_clear(&to);
theora_clear(&td);
theora_comment_clear(&tc);
theora_info_clear(&ti);
}
ogg_sync_clear(&oy);
printf("\r "
"\nDone.\n");
SDL_Quit();
return(0);
}
