diff options
Diffstat (limited to 'faad2/src/libfaad/sbr_syntax.c')
| -rw-r--r-- | faad2/src/libfaad/sbr_syntax.c | 910 |
1 files changed, 910 insertions, 0 deletions
diff --git a/faad2/src/libfaad/sbr_syntax.c b/faad2/src/libfaad/sbr_syntax.c new file mode 100644 index 0000000..02cfd4b --- /dev/null +++ b/faad2/src/libfaad/sbr_syntax.c @@ -0,0 +1,910 @@ +/*
+** 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.
+**
+** The "appropriate copyright message" mentioned in section 2c of the GPLv2
+** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
+**
+** $Id: sbr_syntax.c,v 1.39 2009/01/26 22:32:31 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), sbr->numTimeSlotsRate);
+ }
+ 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 */
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