static sf_count_t
vorbis_seek (SF_PRIVATE *psf, int UNUSED (mode), sf_count_t offset)
{
OGG_PRIVATE *odata = (OGG_PRIVATE *) psf->container_data ;
VORBIS_PRIVATE *vdata = (VORBIS_PRIVATE *) psf->codec_data ;
if (odata == NULL || vdata == NULL)
return 0 ;
if (offset < 0)
{ psf->error = SFE_BAD_SEEK ;
return ((sf_count_t) -1) ;
} ;
if (psf->file.mode == SFM_READ)
{ sf_count_t target = offset - vdata->loc ;
if (target < 0)
{ /* 12 to allow for OggS bit */
psf_fseek (psf, 12, SEEK_SET) ;
vorbis_read_header (psf, 0) ; /* Reset state */
target = offset ;
} ;
while (target > 0)
{ sf_count_t m = target > 4096 ? 4096 : target ;
/*
** Need to multiply by channels here because the seek is done in
** terms of frames and the read function is done in terms of
** samples.
*/
vorbis_read_sample (psf, (void *) NULL, m * psf->sf.channels, vorbis_rnull) ;
target -= m ;
} ;
return vdata->loc ;
} ;
return 0 ;
} /* vorbis_seek */
static sf_count_t
vorbis_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t lens)
{ return vorbis_read_sample (psf, (void*) ptr, lens, vorbis_rdouble) ;
} /* vorbis_read_d */
static sf_count_t
vorbis_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t lens)
{ return vorbis_read_sample (psf, (void*) ptr, lens, vorbis_rfloat) ;
} /* vorbis_read_f */
static sf_count_t
vorbis_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t lens)
{ return vorbis_read_sample (psf, (void*) ptr, lens, vorbis_rint) ;
} /* vorbis_read_i */
static sf_count_t
vorbis_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t lens)
{ return vorbis_read_sample (psf, (void*) ptr, lens, vorbis_rshort) ;
} /* vorbis_read_s */
