ref: e19fec5c35a674e2355a14afebd373531d3e2ef2
dir: /libfaad/sbr_syntax.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Software using this code must display the following message visibly in or
** on each copy of the software:
** "FAAD2 AAC/HE-AAC/HE-AACv2/DRM decoder (c) Nero AG, www.nero.com"
** in, for example, the about-box or help/startup screen.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
**
** $Id: sbr_syntax.c,v 1.36 2006/05/07 18:09:02 menno Exp $
**/
#include "common.h"
#include "structs.h"
#ifdef SBR_DEC
#include "sbr_syntax.h"
#include "syntax.h"
#include "sbr_huff.h"
#include "sbr_fbt.h"
#include "sbr_tf_grid.h"
#include "sbr_e_nf.h"
#include "bits.h"
#ifdef PS_DEC
#include "ps_dec.h"
#endif
#ifdef DRM_PS
#include "drm_dec.h"
#endif
#include "analysis.h"
/* static function declarations */
/* static function declarations */
static void sbr_header(bitfile *ld, sbr_info *sbr);
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);
static uint8_t sbr_data(bitfile *ld, sbr_info *sbr);
static uint16_t sbr_extension(bitfile *ld, sbr_info *sbr,
uint8_t bs_extension_id, uint16_t num_bits_left);
static uint8_t sbr_single_channel_element(bitfile *ld, sbr_info *sbr);
static uint8_t sbr_channel_pair_element(bitfile *ld, sbr_info *sbr);
static uint8_t sbr_grid(bitfile *ld, sbr_info *sbr, uint8_t ch);
static void sbr_dtdf(bitfile *ld, sbr_info *sbr, uint8_t ch);
static void invf_mode(bitfile *ld, sbr_info *sbr, uint8_t ch);
static void sinusoidal_coding(bitfile *ld, sbr_info *sbr, uint8_t ch);
static void sbr_reset(sbr_info *sbr)
{
#if 0
printf("%d\n", sbr->bs_start_freq_prev);
printf("%d\n", sbr->bs_stop_freq_prev);
printf("%d\n", sbr->bs_freq_scale_prev);
printf("%d\n", sbr->bs_alter_scale_prev);
printf("%d\n", sbr->bs_xover_band_prev);
printf("%d\n\n", sbr->bs_noise_bands_prev);
#endif
/* if these are different from the previous frame: Reset = 1 */
if ((sbr->bs_start_freq != sbr->bs_start_freq_prev) ||
(sbr->bs_stop_freq != sbr->bs_stop_freq_prev) ||
(sbr->bs_freq_scale != sbr->bs_freq_scale_prev) ||
(sbr->bs_alter_scale != sbr->bs_alter_scale_prev) ||
(sbr->bs_xover_band != sbr->bs_xover_band_prev) ||
(sbr->bs_noise_bands != sbr->bs_noise_bands_prev))
{
sbr->Reset = 1;
} else {
sbr->Reset = 0;
}
sbr->bs_start_freq_prev = sbr->bs_start_freq;
sbr->bs_stop_freq_prev = sbr->bs_stop_freq;
sbr->bs_freq_scale_prev = sbr->bs_freq_scale;
sbr->bs_alter_scale_prev = sbr->bs_alter_scale;
sbr->bs_xover_band_prev = sbr->bs_xover_band;
sbr->bs_noise_bands_prev = sbr->bs_noise_bands;
}
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 psResetFlag)
{
uint8_t result = 0;
uint16_t num_align_bits = 0;
uint16_t num_sbr_bits1 = (uint16_t)faad_get_processed_bits(ld);
uint16_t num_sbr_bits2;
uint8_t saved_start_freq, saved_samplerate_mode;
uint8_t saved_stop_freq, saved_freq_scale;
uint8_t saved_alter_scale, saved_xover_band;
#if (defined(PS_DEC) || defined(DRM_PS))
if (psResetFlag)
sbr->psResetFlag = psResetFlag;
#endif
#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"));
}
}
/* save old header values, in case the new ones are corrupted */
saved_start_freq = sbr->bs_start_freq;
saved_samplerate_mode = sbr->bs_samplerate_mode;
saved_stop_freq = sbr->bs_stop_freq;
saved_freq_scale = sbr->bs_freq_scale;
saved_alter_scale = sbr->bs_alter_scale;
saved_xover_band = sbr->bs_xover_band;
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 rt = calc_sbr_tables(sbr, sbr->bs_start_freq, sbr->bs_stop_freq,
sbr->bs_samplerate_mode, sbr->bs_freq_scale,
sbr->bs_alter_scale, sbr->bs_xover_band);
/* if an error occured with the new header values revert to the old ones */
if (rt > 0)
{
calc_sbr_tables(sbr, saved_start_freq, saved_stop_freq,
saved_samplerate_mode, saved_freq_scale,
saved_alter_scale, saved_xover_band);
}
}
if (result == 0)
{
result = sbr_data(ld, sbr);
/* sbr_data() returning an error means that there was an error in
envelope_time_border_vector().
In this case the old time border vector is saved and all the previous
data normally read after sbr_grid() is saved.
*/
/* to be on the safe side, calculate old sbr tables in case of error */
if ((result > 0) &&
(sbr->Reset || (sbr->bs_header_flag && sbr->just_seeked)))
{
calc_sbr_tables(sbr, saved_start_freq, saved_stop_freq,
saved_samplerate_mode, saved_freq_scale,
saved_alter_scale, saved_xover_band);
}
/* we should be able to safely set result to 0 now, */
/* but practise indicates this doesn't work well */
}
} else {
result = 1;
}
num_sbr_bits2 = (uint16_t)faad_get_processed_bits(ld) - num_sbr_bits1;
/* check if we read more bits then were available for sbr */
if (8*cnt < num_sbr_bits2)
{
faad_resetbits(ld, num_sbr_bits1 + 8*cnt);
num_sbr_bits2 = 8*cnt;
#ifdef PS_DEC
/* turn off PS for the unfortunate case that we randomly read some
* PS data that looks correct */
sbr->ps_used = 0;
#endif
/* Make sure it doesn't decode SBR in this frame, or we'll get glitches */
return 1;
}
#ifdef DRM
if (!sbr->Is_DRM_SBR)
#endif
{
/* -4 does not apply, bs_extension_type is re-read in this function */
num_align_bits = 8*cnt /*- 4*/ - num_sbr_bits2;
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;
}
/* table 3 */
static void sbr_header(bitfile *ld, sbr_info *sbr)
{
uint8_t bs_header_extra_1, bs_header_extra_2;
sbr->header_count++;
sbr->bs_amp_res = faad_get1bit(ld
DEBUGVAR(1,203,"sbr_header(): bs_amp_res"));
/* bs_start_freq and bs_stop_freq must define a fequency band that does
not exceed 48 channels */
sbr->bs_start_freq = (uint8_t)faad_getbits(ld, 4
DEBUGVAR(1,204,"sbr_header(): bs_start_freq"));
sbr->bs_stop_freq = (uint8_t)faad_getbits(ld, 4
DEBUGVAR(1,205,"sbr_header(): bs_stop_freq"));
sbr->bs_xover_band = (uint8_t)faad_getbits(ld, 3
DEBUGVAR(1,206,"sbr_header(): bs_xover_band"));
faad_getbits(ld, 2
DEBUGVAR(1,207,"sbr_header(): bs_reserved_bits_hdr"));
bs_header_extra_1 = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,208,"sbr_header(): bs_header_extra_1"));
bs_header_extra_2 = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,209,"sbr_header(): bs_header_extra_2"));
if (bs_header_extra_1)
{
sbr->bs_freq_scale = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,211,"sbr_header(): bs_freq_scale"));
sbr->bs_alter_scale = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,212,"sbr_header(): bs_alter_scale"));
sbr->bs_noise_bands = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,213,"sbr_header(): bs_noise_bands"));
} else {
/* Default values */
sbr->bs_freq_scale = 2;
sbr->bs_alter_scale = 1;
sbr->bs_noise_bands = 2;
}
if (bs_header_extra_2)
{
sbr->bs_limiter_bands = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,214,"sbr_header(): bs_limiter_bands"));
sbr->bs_limiter_gains = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,215,"sbr_header(): bs_limiter_gains"));
sbr->bs_interpol_freq = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,216,"sbr_header(): bs_interpol_freq"));
sbr->bs_smoothing_mode = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,217,"sbr_header(): bs_smoothing_mode"));
} else {
/* Default values */
sbr->bs_limiter_bands = 2;
sbr->bs_limiter_gains = 2;
sbr->bs_interpol_freq = 1;
sbr->bs_smoothing_mode = 1;
}
#if 0
/* print the header to screen */
printf("bs_amp_res: %d\n", sbr->bs_amp_res);
printf("bs_start_freq: %d\n", sbr->bs_start_freq);
printf("bs_stop_freq: %d\n", sbr->bs_stop_freq);
printf("bs_xover_band: %d\n", sbr->bs_xover_band);
if (bs_header_extra_1)
{
printf("bs_freq_scale: %d\n", sbr->bs_freq_scale);
printf("bs_alter_scale: %d\n", sbr->bs_alter_scale);
printf("bs_noise_bands: %d\n", sbr->bs_noise_bands);
}
if (bs_header_extra_2)
{
printf("bs_limiter_bands: %d\n", sbr->bs_limiter_bands);
printf("bs_limiter_gains: %d\n", sbr->bs_limiter_gains);
printf("bs_interpol_freq: %d\n", sbr->bs_interpol_freq);
printf("bs_smoothing_mode: %d\n", sbr->bs_smoothing_mode);
}
printf("\n");
#endif
}
/* table 4 */
static uint8_t sbr_data(bitfile *ld, sbr_info *sbr)
{
uint8_t result;
#if 0
sbr->bs_samplerate_mode = faad_get1bit(ld
DEBUGVAR(1,219,"sbr_data(): bs_samplerate_mode"));
#endif
sbr->rate = (sbr->bs_samplerate_mode) ? 2 : 1;
switch (sbr->id_aac)
{
case ID_SCE:
if ((result = sbr_single_channel_element(ld, sbr)) > 0)
return result;
break;
case ID_CPE:
if ((result = sbr_channel_pair_element(ld, sbr)) > 0)
return result;
break;
}
return 0;
}
/* table 5 */
static uint8_t sbr_single_channel_element(bitfile *ld, sbr_info *sbr)
{
uint8_t result;
if (faad_get1bit(ld
DEBUGVAR(1,220,"sbr_single_channel_element(): bs_data_extra")))
{
faad_getbits(ld, 4
DEBUGVAR(1,221,"sbr_single_channel_element(): bs_reserved_bits_data"));
}
#ifdef DRM
/* bs_coupling, from sbr_channel_pair_base_element(bs_amp_res) */
if (sbr->Is_DRM_SBR)
{
faad_get1bit(ld);
}
#endif
if ((result = sbr_grid(ld, sbr, 0)) > 0)
return result;
sbr_dtdf(ld, sbr, 0);
invf_mode(ld, sbr, 0);
sbr_envelope(ld, sbr, 0);
sbr_noise(ld, sbr, 0);
#ifndef FIXED_POINT
envelope_noise_dequantisation(sbr, 0);
#endif
memset(sbr->bs_add_harmonic[0], 0, 64*sizeof(uint8_t));
sbr->bs_add_harmonic_flag[0] = faad_get1bit(ld
DEBUGVAR(1,223,"sbr_single_channel_element(): bs_add_harmonic_flag[0]"));
if (sbr->bs_add_harmonic_flag[0])
sinusoidal_coding(ld, sbr, 0);
sbr->bs_extended_data = faad_get1bit(ld
DEBUGVAR(1,224,"sbr_single_channel_element(): bs_extended_data[0]"));
if (sbr->bs_extended_data)
{
uint16_t nr_bits_left;
#if (defined(PS_DEC) || defined(DRM_PS))
uint8_t ps_ext_read = 0;
#endif
uint16_t cnt = (uint16_t)faad_getbits(ld, 4
DEBUGVAR(1,225,"sbr_single_channel_element(): bs_extension_size"));
if (cnt == 15)
{
cnt += (uint16_t)faad_getbits(ld, 8
DEBUGVAR(1,226,"sbr_single_channel_element(): bs_esc_count"));
}
nr_bits_left = 8 * cnt;
while (nr_bits_left > 7)
{
uint16_t tmp_nr_bits = 0;
sbr->bs_extension_id = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,227,"sbr_single_channel_element(): bs_extension_id"));
tmp_nr_bits += 2;
/* allow only 1 PS extension element per extension data */
#if (defined(PS_DEC) || defined(DRM_PS))
#if (defined(PS_DEC) && defined(DRM_PS))
if (sbr->bs_extension_id == EXTENSION_ID_PS || sbr->bs_extension_id == DRM_PARAMETRIC_STEREO)
#else
#ifdef PS_DEC
if (sbr->bs_extension_id == EXTENSION_ID_PS)
#else
#ifdef DRM_PS
if (sbr->bs_extension_id == DRM_PARAMETRIC_STEREO)
#endif
#endif
#endif
{
if (ps_ext_read == 0)
{
ps_ext_read = 1;
} else {
/* to be safe make it 3, will switch to "default"
* in sbr_extension() */
#ifdef DRM
return 1;
#else
sbr->bs_extension_id = 3;
#endif
}
}
#endif
tmp_nr_bits += sbr_extension(ld, sbr, sbr->bs_extension_id, nr_bits_left);
/* check if the data read is bigger than the number of available bits */
if (tmp_nr_bits > nr_bits_left)
return 1;
nr_bits_left -= tmp_nr_bits;
}
/* Corrigendum */
if (nr_bits_left > 0)
{
faad_getbits(ld, nr_bits_left
DEBUGVAR(1,280,"sbr_single_channel_element(): nr_bits_left"));
}
}
return 0;
}
/* table 6 */
static uint8_t sbr_channel_pair_element(bitfile *ld, sbr_info *sbr)
{
uint8_t n, result;
if (faad_get1bit(ld
DEBUGVAR(1,228,"sbr_single_channel_element(): bs_data_extra")))
{
faad_getbits(ld, 4
DEBUGVAR(1,228,"sbr_channel_pair_element(): bs_reserved_bits_data"));
faad_getbits(ld, 4
DEBUGVAR(1,228,"sbr_channel_pair_element(): bs_reserved_bits_data"));
}
sbr->bs_coupling = faad_get1bit(ld
DEBUGVAR(1,228,"sbr_channel_pair_element(): bs_coupling"));
if (sbr->bs_coupling)
{
if ((result = sbr_grid(ld, sbr, 0)) > 0)
return result;
/* need to copy some data from left to right */
sbr->bs_frame_class[1] = sbr->bs_frame_class[0];
sbr->L_E[1] = sbr->L_E[0];
sbr->L_Q[1] = sbr->L_Q[0];
sbr->bs_pointer[1] = sbr->bs_pointer[0];
for (n = 0; n <= sbr->L_E[0]; n++)
{
sbr->t_E[1][n] = sbr->t_E[0][n];
sbr->f[1][n] = sbr->f[0][n];
}
for (n = 0; n <= sbr->L_Q[0]; n++)
sbr->t_Q[1][n] = sbr->t_Q[0][n];
sbr_dtdf(ld, sbr, 0);
sbr_dtdf(ld, sbr, 1);
invf_mode(ld, sbr, 0);
/* more copying */
for (n = 0; n < sbr->N_Q; n++)
sbr->bs_invf_mode[1][n] = sbr->bs_invf_mode[0][n];
sbr_envelope(ld, sbr, 0);
sbr_noise(ld, sbr, 0);
sbr_envelope(ld, sbr, 1);
sbr_noise(ld, sbr, 1);
memset(sbr->bs_add_harmonic[0], 0, 64*sizeof(uint8_t));
memset(sbr->bs_add_harmonic[1], 0, 64*sizeof(uint8_t));
sbr->bs_add_harmonic_flag[0] = faad_get1bit(ld
DEBUGVAR(1,231,"sbr_channel_pair_element(): bs_add_harmonic_flag[0]"));
if (sbr->bs_add_harmonic_flag[0])
sinusoidal_coding(ld, sbr, 0);
sbr->bs_add_harmonic_flag[1] = faad_get1bit(ld
DEBUGVAR(1,232,"sbr_channel_pair_element(): bs_add_harmonic_flag[1]"));
if (sbr->bs_add_harmonic_flag[1])
sinusoidal_coding(ld, sbr, 1);
} else {
uint8_t saved_t_E[6] = {0}, saved_t_Q[3] = {0};
uint8_t saved_L_E = sbr->L_E[0];
uint8_t saved_L_Q = sbr->L_Q[0];
uint8_t saved_frame_class = sbr->bs_frame_class[0];
for (n = 0; n < saved_L_E; n++)
saved_t_E[n] = sbr->t_E[0][n];
for (n = 0; n < saved_L_Q; n++)
saved_t_Q[n] = sbr->t_Q[0][n];
if ((result = sbr_grid(ld, sbr, 0)) > 0)
return result;
if ((result = sbr_grid(ld, sbr, 1)) > 0)
{
/* restore first channel data as well */
sbr->bs_frame_class[0] = saved_frame_class;
sbr->L_E[0] = saved_L_E;
sbr->L_Q[0] = saved_L_Q;
for (n = 0; n < 6; n++)
sbr->t_E[0][n] = saved_t_E[n];
for (n = 0; n < 3; n++)
sbr->t_Q[0][n] = saved_t_Q[n];
return result;
}
sbr_dtdf(ld, sbr, 0);
sbr_dtdf(ld, sbr, 1);
invf_mode(ld, sbr, 0);
invf_mode(ld, sbr, 1);
sbr_envelope(ld, sbr, 0);
sbr_envelope(ld, sbr, 1);
sbr_noise(ld, sbr, 0);
sbr_noise(ld, sbr, 1);
memset(sbr->bs_add_harmonic[0], 0, 64*sizeof(uint8_t));
memset(sbr->bs_add_harmonic[1], 0, 64*sizeof(uint8_t));
sbr->bs_add_harmonic_flag[0] = faad_get1bit(ld
DEBUGVAR(1,239,"sbr_channel_pair_element(): bs_add_harmonic_flag[0]"));
if (sbr->bs_add_harmonic_flag[0])
sinusoidal_coding(ld, sbr, 0);
sbr->bs_add_harmonic_flag[1] = faad_get1bit(ld
DEBUGVAR(1,240,"sbr_channel_pair_element(): bs_add_harmonic_flag[1]"));
if (sbr->bs_add_harmonic_flag[1])
sinusoidal_coding(ld, sbr, 1);
}
#ifndef FIXED_POINT
envelope_noise_dequantisation(sbr, 0);
envelope_noise_dequantisation(sbr, 1);
if (sbr->bs_coupling)
unmap_envelope_noise(sbr);
#endif
sbr->bs_extended_data = faad_get1bit(ld
DEBUGVAR(1,233,"sbr_channel_pair_element(): bs_extended_data[0]"));
if (sbr->bs_extended_data)
{
uint16_t nr_bits_left;
uint16_t cnt = (uint16_t)faad_getbits(ld, 4
DEBUGVAR(1,234,"sbr_channel_pair_element(): bs_extension_size"));
if (cnt == 15)
{
cnt += (uint16_t)faad_getbits(ld, 8
DEBUGVAR(1,235,"sbr_channel_pair_element(): bs_esc_count"));
}
nr_bits_left = 8 * cnt;
while (nr_bits_left > 7)
{
uint16_t tmp_nr_bits = 0;
sbr->bs_extension_id = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,236,"sbr_channel_pair_element(): bs_extension_id"));
tmp_nr_bits += 2;
tmp_nr_bits += sbr_extension(ld, sbr, sbr->bs_extension_id, nr_bits_left);
/* check if the data read is bigger than the number of available bits */
if (tmp_nr_bits > nr_bits_left)
return 1;
nr_bits_left -= tmp_nr_bits;
}
/* Corrigendum */
if (nr_bits_left > 0)
{
faad_getbits(ld, nr_bits_left
DEBUGVAR(1,280,"sbr_channel_pair_element(): nr_bits_left"));
}
}
return 0;
}
/* integer log[2](x): input range [0,10) */
static int8_t sbr_log2(const int8_t val)
{
int8_t log2tab[] = { 0, 0, 1, 2, 2, 3, 3, 3, 3, 4 };
if (val < 10 && val >= 0)
return log2tab[val];
else
return 0;
}
/* table 7 */
static uint8_t sbr_grid(bitfile *ld, sbr_info *sbr, uint8_t ch)
{
uint8_t i, env, rel, result;
uint8_t bs_abs_bord, bs_abs_bord_1;
uint8_t bs_num_env = 0;
uint8_t saved_L_E = sbr->L_E[ch];
uint8_t saved_L_Q = sbr->L_Q[ch];
uint8_t saved_frame_class = sbr->bs_frame_class[ch];
sbr->bs_frame_class[ch] = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,248,"sbr_grid(): bs_frame_class"));
switch (sbr->bs_frame_class[ch])
{
case FIXFIX:
i = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,249,"sbr_grid(): bs_num_env_raw"));
bs_num_env = min(1 << i, 5);
i = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,250,"sbr_grid(): bs_freq_res_flag"));
for (env = 0; env < bs_num_env; env++)
sbr->f[ch][env] = i;
sbr->abs_bord_lead[ch] = 0;
sbr->abs_bord_trail[ch] = sbr->numTimeSlots;
sbr->n_rel_lead[ch] = bs_num_env - 1;
sbr->n_rel_trail[ch] = 0;
break;
case FIXVAR:
bs_abs_bord = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,251,"sbr_grid(): bs_abs_bord")) + sbr->numTimeSlots;
bs_num_env = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,252,"sbr_grid(): bs_num_env")) + 1;
for (rel = 0; rel < bs_num_env-1; rel++)
{
sbr->bs_rel_bord[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,253,"sbr_grid(): bs_rel_bord")) + 2;
}
i = sbr_log2(bs_num_env + 1);
sbr->bs_pointer[ch] = (uint8_t)faad_getbits(ld, i
DEBUGVAR(1,254,"sbr_grid(): bs_pointer"));
for (env = 0; env < bs_num_env; env++)
{
sbr->f[ch][bs_num_env - env - 1] = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,255,"sbr_grid(): bs_freq_res"));
}
sbr->abs_bord_lead[ch] = 0;
sbr->abs_bord_trail[ch] = bs_abs_bord;
sbr->n_rel_lead[ch] = 0;
sbr->n_rel_trail[ch] = bs_num_env - 1;
break;
case VARFIX:
bs_abs_bord = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,256,"sbr_grid(): bs_abs_bord"));
bs_num_env = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,257,"sbr_grid(): bs_num_env")) + 1;
for (rel = 0; rel < bs_num_env-1; rel++)
{
sbr->bs_rel_bord[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,258,"sbr_grid(): bs_rel_bord")) + 2;
}
i = sbr_log2(bs_num_env + 1);
sbr->bs_pointer[ch] = (uint8_t)faad_getbits(ld, i
DEBUGVAR(1,259,"sbr_grid(): bs_pointer"));
for (env = 0; env < bs_num_env; env++)
{
sbr->f[ch][env] = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,260,"sbr_grid(): bs_freq_res"));
}
sbr->abs_bord_lead[ch] = bs_abs_bord;
sbr->abs_bord_trail[ch] = sbr->numTimeSlots;
sbr->n_rel_lead[ch] = bs_num_env - 1;
sbr->n_rel_trail[ch] = 0;
break;
case VARVAR:
bs_abs_bord = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,261,"sbr_grid(): bs_abs_bord_0"));
bs_abs_bord_1 = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,262,"sbr_grid(): bs_abs_bord_1")) + sbr->numTimeSlots;
sbr->bs_num_rel_0[ch] = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,263,"sbr_grid(): bs_num_rel_0"));
sbr->bs_num_rel_1[ch] = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,264,"sbr_grid(): bs_num_rel_1"));
bs_num_env = min(5, sbr->bs_num_rel_0[ch] + sbr->bs_num_rel_1[ch] + 1);
for (rel = 0; rel < sbr->bs_num_rel_0[ch]; rel++)
{
sbr->bs_rel_bord_0[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,265,"sbr_grid(): bs_rel_bord")) + 2;
}
for(rel = 0; rel < sbr->bs_num_rel_1[ch]; rel++)
{
sbr->bs_rel_bord_1[ch][rel] = 2 * (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,266,"sbr_grid(): bs_rel_bord")) + 2;
}
i = sbr_log2(sbr->bs_num_rel_0[ch] + sbr->bs_num_rel_1[ch] + 2);
sbr->bs_pointer[ch] = (uint8_t)faad_getbits(ld, i
DEBUGVAR(1,267,"sbr_grid(): bs_pointer"));
for (env = 0; env < bs_num_env; env++)
{
sbr->f[ch][env] = (uint8_t)faad_get1bit(ld
DEBUGVAR(1,268,"sbr_grid(): bs_freq_res"));
}
sbr->abs_bord_lead[ch] = bs_abs_bord;
sbr->abs_bord_trail[ch] = bs_abs_bord_1;
sbr->n_rel_lead[ch] = sbr->bs_num_rel_0[ch];
sbr->n_rel_trail[ch] = sbr->bs_num_rel_1[ch];
break;
}
if (sbr->bs_frame_class[ch] == VARVAR)
sbr->L_E[ch] = min(bs_num_env, 5);
else
sbr->L_E[ch] = min(bs_num_env, 4);
if (sbr->L_E[ch] <= 0)
return 1;
if (sbr->L_E[ch] > 1)
sbr->L_Q[ch] = 2;
else
sbr->L_Q[ch] = 1;
/* TODO: this code can probably be integrated into the code above! */
if ((result = envelope_time_border_vector(sbr, ch)) > 0)
{
sbr->bs_frame_class[ch] = saved_frame_class;
sbr->L_E[ch] = saved_L_E;
sbr->L_Q[ch] = saved_L_Q;
return result;
}
noise_floor_time_border_vector(sbr, ch);
#if 0
for (env = 0; env < bs_num_env; env++)
{
printf("freq_res[ch:%d][env:%d]: %d\n", ch, env, sbr->f[ch][env]);
}
#endif
return 0;
}
/* table 8 */
static void sbr_dtdf(bitfile *ld, sbr_info *sbr, uint8_t ch)
{
uint8_t i;
for (i = 0; i < sbr->L_E[ch]; i++)
{
sbr->bs_df_env[ch][i] = faad_get1bit(ld
DEBUGVAR(1,269,"sbr_dtdf(): bs_df_env"));
}
for (i = 0; i < sbr->L_Q[ch]; i++)
{
sbr->bs_df_noise[ch][i] = faad_get1bit(ld
DEBUGVAR(1,270,"sbr_dtdf(): bs_df_noise"));
}
}
/* table 9 */
static void invf_mode(bitfile *ld, sbr_info *sbr, uint8_t ch)
{
uint8_t n;
for (n = 0; n < sbr->N_Q; n++)
{
sbr->bs_invf_mode[ch][n] = (uint8_t)faad_getbits(ld, 2
DEBUGVAR(1,271,"invf_mode(): bs_invf_mode"));
}
}
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;
}
}
/* table 12 */
static void sinusoidal_coding(bitfile *ld, sbr_info *sbr, uint8_t ch)
{
uint8_t n;
for (n = 0; n < sbr->N_high; n++)
{
sbr->bs_add_harmonic[ch][n] = faad_get1bit(ld
DEBUGVAR(1,278,"sinusoidal_coding(): bs_add_harmonic"));
}
}
#endif /* SBR_DEC */