static uint16_t sbr_extension(bitfile *ld, sbr_info *sbr,
uint8_t bs_extension_id, uint16_t num_bits_left)
{
switch (bs_extension_id)
{
#ifdef PS_DEC
case EXTENSION_ID_PS:
sbr->ps_used = 1;
if (!sbr->ps)
{
sbr->ps = ps_init(get_sr_index(sbr->sample_rate));
}
return ps_data(sbr->ps, ld);
#endif
#ifdef DRM_PS
case DRM_PARAMETRIC_STEREO:
sbr->ps_used = 1;
if (!sbr->drm_ps)
{
sbr->drm_ps = drm_ps_init();
}
return drm_ps_data(sbr->drm_ps, ld);
#endif
default:
sbr->bs_extension_data = (uint8_t)faad_getbits(ld, 6
DEBUGVAR(1,279,"sbr_single_channel_element(): bs_extension_data"));
return 6;
}
}
static void patch_construction(sbr_info *sbr)
{
uint8_t i, k;
uint8_t odd, sb;
uint8_t msb = sbr->k0;
uint8_t usb = sbr->kx;
uint8_t goalSbTab[] = { 21, 23, 43, 46, 64, 85, 93, 128, 0, 0, 0 };
/* (uint8_t)(2.048e6/sbr->sample_rate + 0.5); */
uint8_t goalSb = goalSbTab[get_sr_index(sbr->sample_rate)];
sbr->noPatches = 0;
if (goalSb < (sbr->kx + sbr->M))
{
for (i = 0, k = 0; sbr->f_master[i] < goalSb; i++)
k = i+1;
} else {
k = sbr->N_master;
}
do
{
uint8_t j = k + 1;
do
{
j--;
sb = sbr->f_master[j];
odd = (sb - 2 + sbr->k0) % 2;
} while (sb > (sbr->k0 - 1 + msb - odd));
sbr->patchNoSubbands[sbr->noPatches] = max(sb - usb, 0);
sbr->patchStartSubband[sbr->noPatches] = sbr->k0 - odd -
sbr->patchNoSubbands[sbr->noPatches];
if (sbr->patchNoSubbands[sbr->noPatches] > 0)
{
usb = sb;
msb = sb;
sbr->noPatches++;
} else {
msb = sbr->kx;
}
if (sbr->f_master[k] - sb < 3)
k = sbr->N_master;
} while (sb != (sbr->kx + sbr->M));
if ((sbr->patchNoSubbands[sbr->noPatches-1] < 3) && (sbr->noPatches > 1))
{
sbr->noPatches--;
}
sbr->noPatches = min(sbr->noPatches, 5);
}
static uint16_t sbr_extension(bitfile *ld, sbr_info *sbr,
uint8_t bs_extension_id, uint16_t num_bits_left)
{
#ifdef PS_DEC
uint8_t header;
uint16_t ret;
#endif
switch (bs_extension_id)
{
#ifdef PS_DEC
case EXTENSION_ID_PS:
if (!sbr->ps)
{
sbr->ps = ps_init(get_sr_index(sbr->sample_rate));
}
if (sbr->psResetFlag)
{
sbr->ps->header_read = 0;
}
ret = ps_data(sbr->ps, ld, &header);
/* enable PS if and only if: a header has been decoded */
if (sbr->ps_used == 0 && header == 1)
{
sbr->ps_used = 1;
}
if (header == 1)
{
sbr->psResetFlag = 0;
}
return ret;
#endif
#ifdef DRM_PS
case DRM_PARAMETRIC_STEREO:
sbr->ps_used = 1;
if (!sbr->drm_ps)
{
sbr->drm_ps = drm_ps_init();
}
return drm_ps_data(sbr->drm_ps, ld);
#endif
default:
sbr->bs_extension_data = (uint8_t)faad_getbits(ld, 6
DEBUGVAR(1,279,"sbr_single_channel_element(): bs_extension_data"));
return 6;
}
}
