static uint8_t calc_sbr_tables(sbr_info *sbr, uint8_t start_freq, uint8_t stop_freq,
uint8_t samplerate_mode, uint8_t freq_scale,
uint8_t alter_scale, uint8_t xover_band)
{
uint8_t result = 0;
uint8_t k2;
/* calculate the Master Frequency Table */
sbr->k0 = qmf_start_channel(start_freq, samplerate_mode, sbr->sample_rate);
k2 = qmf_stop_channel(stop_freq, sbr->sample_rate, sbr->k0);
/* check k0 and k2 */
if (sbr->sample_rate >= 48000)
{
if ((k2 - sbr->k0) > 32)
result += 1;
} else if (sbr->sample_rate <= 32000) {
if ((k2 - sbr->k0) > 48)
result += 1;
} else { /* (sbr->sample_rate == 44100) */
if ((k2 - sbr->k0) > 45)
result += 1;
}
if (freq_scale == 0)
{
result += master_frequency_table_fs0(sbr, sbr->k0, k2, alter_scale);
} else {
result += master_frequency_table(sbr, sbr->k0, k2, freq_scale, alter_scale);
}
result += derived_frequency_table(sbr, xover_band, k2);
result = (result > 0) ? 1 : 0;
return result;
}
/* table 2 */
uint8_t sbr_extension_data(bitfile *ld, sbr_info *sbr, uint16_t cnt)
{
uint8_t result = 0;
uint16_t num_align_bits = 0;
uint16_t num_sbr_bits = (uint16_t)faad_get_processed_bits(ld);
#ifdef DRM
if (!sbr->Is_DRM_SBR)
#endif
{
uint8_t bs_extension_type = (uint8_t)faad_getbits(ld, 4
DEBUGVAR(1,198,"sbr_bitstream(): bs_extension_type"));
if (bs_extension_type == EXT_SBR_DATA_CRC)
{
sbr->bs_sbr_crc_bits = (uint16_t)faad_getbits(ld, 10
DEBUGVAR(1,199,"sbr_bitstream(): bs_sbr_crc_bits"));
}
}
sbr->bs_header_flag = faad_get1bit(ld
DEBUGVAR(1,200,"sbr_bitstream(): bs_header_flag"));
if (sbr->bs_header_flag)
sbr_header(ld, sbr);
/* Reset? */
sbr_reset(sbr);
/* first frame should have a header */
//if (!(sbr->frame == 0 && sbr->bs_header_flag == 0))
if (sbr->header_count != 0)
{
if (sbr->Reset || (sbr->bs_header_flag && sbr->just_seeked))
{
uint8_t k2;
/* calculate the Master Frequency Table */
sbr->k0 = qmf_start_channel(sbr->bs_start_freq, sbr->bs_samplerate_mode,
sbr->sample_rate);
k2 = qmf_stop_channel(sbr->bs_stop_freq, sbr->sample_rate, sbr->k0);
/* check k0 and k2 */
if (sbr->sample_rate >= 48000)
{
if ((k2 - sbr->k0) > 32)
result += 1;
} else if (sbr->sample_rate <= 32000) {
if ((k2 - sbr->k0) > 48)
result += 1;
} else { /* (sbr->sample_rate == 44100) */
if ((k2 - sbr->k0) > 45)
result += 1;
}
if (sbr->bs_freq_scale == 0)
{
result += master_frequency_table_fs0(sbr, sbr->k0, k2,
sbr->bs_alter_scale);
} else {
result += master_frequency_table(sbr, sbr->k0, k2, sbr->bs_freq_scale,
sbr->bs_alter_scale);
}
result += derived_frequency_table(sbr, sbr->bs_xover_band, k2);
result = (result > 0) ? 1 : 0;
}
if (result == 0)
result = sbr_data(ld, sbr);
} else {
result = 1;
}
#ifdef DRM
if (!sbr->Is_DRM_SBR)
#endif
{
num_sbr_bits = (uint16_t)faad_get_processed_bits(ld) - num_sbr_bits;
/* -4 does not apply, bs_extension_type is re-read in this function */
num_align_bits = 8*cnt /*- 4*/ - num_sbr_bits;
while (num_align_bits > 7)
{
faad_getbits(ld, 8
DEBUGVAR(1,999,"sbr_bitstream(): num_align_bits"));
num_align_bits -= 8;
}
faad_getbits(ld, num_align_bits
DEBUGVAR(1,999,"sbr_bitstream(): num_align_bits"));
}
return result;
}
