gistfile1.js

        /* theora is one in, one out... */
        if (ogg_stream_packetpeek(&theoraStreamState, &videoPacket) > 0) {
            videobufReady = 1;

            videobufGranulepos = videoPacket.granulepos;
	        videobufTime = th_granule_time(theoraDecoderContext, videobufGranulepos);
			keyframeGranulepos = (videobufGranulepos >> theoraInfo.keyframe_granule_shift) << theoraInfo.keyframe_granule_shift;
			keyframeTime = th_granule_time(theoraDecoderContext, keyframeGranulepos);
			printf("granulepos: %llx; time %lf; offset %d\n",(unsigned long long)videobufGranulepos, (double)videobufTime, (int)theoraInfo.keyframe_granule_shift);

            OgvJsOutputFrameReady(videobufTime, keyframeTime);
        } else {
            needData = 1;
        }