Hi people,
Last problem is a simple API question.
The granulepos in Theora is a combination of keyframe number + frames since
the last keyframe. This is nice for seeking to the last keyframe. But why
isn't this available in the public API of libtheora? I had to include
codec_internal.h (the name does suggest to me that this is bad) and code
this:
ogg_int64_t framesSinceKeyframe(theora_state *th,ogg_int64_t granulepos) {
CP_INSTANCE *cpi=(CP_INSTANCE *)(th->internal_encode);
PB_INSTANCE *pbi=(PB_INSTANCE *)(th->internal_decode);
if(cpi)
pbi=&cpi->pb;
if (granulepos>=0) {
ogg_int64_t iframe = granulepos >> pbi->keyframe_granule_shift;
return granulepos - (iframe << pbi->keyframe_granule_shift);
}
return(-1);
}
ogg_int64_t keyframeNumber(theora_state *th,ogg_int64_t granulepos) {
CP_INSTANCE *cpi=(CP_INSTANCE *)(th->internal_encode);
PB_INSTANCE *pbi=(PB_INSTANCE *)(th->internal_decode);
if(cpi)
pbi=&cpi->pb;
if (granulepos>=0) {
return granulepos >> pbi->keyframe_granule_shift;
}
return(-1);
}
It would have been nice if these were part of the library. Feel free to grab
the code and include it, if you agree.
Bo Thorsen.
--
Thorsen Consulting ApS - Qt consulting services
http://www.thorsen-consulting.dk