Convert a granulepos to an absolute frame number. The granulepos is interpreted in the context of a given theora_state handle.

Parameters:

th	A previously initialized theora_state handle (encode or decode)
granulepos	The granulepos to convert.

Returns:

The frame number corresponding to granulepos.

Return values:

-1	The given granulepos is undefined (i.e. negative)

Thus function was added in the 1.0alpha4 release.

Definition at line 450 of file toplevel.c.

References theora_granule_frame().

Referenced by theora_granule_frame().

                                                                         {
  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;
    ogg_int64_t pframe=granulepos-(iframe<<pbi->keyframe_granule_shift);

    return (iframe+pframe);
  }

  return(-1);
}