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* AAC Spectral Band Replication decoding functions
3
* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
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* Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* AAC Spectral Band Replication decoding functions
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* @author Robert Swain ( rob opendot cl )
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#include "aacsbrdata.h"
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#define ENVELOPE_ADJUSTMENT_OFFSET 2
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#define NOISE_FLOOR_OFFSET 6.0f
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T_HUFFMAN_ENV_BAL_1_5DB,
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F_HUFFMAN_ENV_BAL_1_5DB,
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T_HUFFMAN_ENV_BAL_3_0DB,
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F_HUFFMAN_ENV_BAL_3_0DB,
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T_HUFFMAN_NOISE_3_0DB,
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T_HUFFMAN_NOISE_BAL_3_0DB,
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* bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
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static VLC vlc_sbr[10];
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static const int8_t vlc_sbr_lav[10] =
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{ 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
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static const DECLARE_ALIGNED(16, float, zero64)[64];
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#define SBR_INIT_VLC_STATIC(num, size) \
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INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size, \
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sbr_tmp[num].sbr_bits , 1, 1, \
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sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
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#define SBR_VLC_ROW(name) \
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{ name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
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av_cold void ff_aac_sbr_init(void)
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const void *sbr_codes, *sbr_bits;
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const unsigned int table_size, elem_size;
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SBR_VLC_ROW(t_huffman_env_1_5dB),
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SBR_VLC_ROW(f_huffman_env_1_5dB),
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SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
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SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
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SBR_VLC_ROW(t_huffman_env_3_0dB),
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SBR_VLC_ROW(f_huffman_env_3_0dB),
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SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
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SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
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SBR_VLC_ROW(t_huffman_noise_3_0dB),
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SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
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// SBR VLC table initialization
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SBR_INIT_VLC_STATIC(0, 1098);
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SBR_INIT_VLC_STATIC(1, 1092);
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SBR_INIT_VLC_STATIC(2, 768);
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SBR_INIT_VLC_STATIC(3, 1026);
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SBR_INIT_VLC_STATIC(4, 1058);
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SBR_INIT_VLC_STATIC(5, 1052);
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SBR_INIT_VLC_STATIC(6, 544);
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SBR_INIT_VLC_STATIC(7, 544);
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SBR_INIT_VLC_STATIC(8, 592);
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SBR_INIT_VLC_STATIC(9, 512);
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for (n = 1; n < 320; n++)
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sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
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sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
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sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
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for (n = 0; n < 320; n++)
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sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
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av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr)
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sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
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sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
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sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
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sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
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ff_mdct_init(&sbr->mdct, 7, 1, 1.0/64);
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ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0);
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ff_ps_ctx_init(&sbr->ps);
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av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
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ff_mdct_end(&sbr->mdct);
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ff_mdct_end(&sbr->mdct_ana);
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static int qsort_comparison_function_int16(const void *a, const void *b)
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return *(const int16_t *)a - *(const int16_t *)b;
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static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
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for (i = 0; i <= last_el; i++)
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if (table[i] == needle)
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/// Limiter Frequency Band Table (14496-3 sp04 p198)
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static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
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if (sbr->bs_limiter_bands > 0) {
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static const float bands_warped[3] = { 1.32715174233856803909f, //2^(0.49/1.2)
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1.18509277094158210129f, //2^(0.49/2)
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1.11987160404675912501f }; //2^(0.49/3)
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const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
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int16_t patch_borders[7];
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uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
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patch_borders[0] = sbr->kx[1];
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for (k = 1; k <= sbr->num_patches; k++)
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patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
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memcpy(sbr->f_tablelim, sbr->f_tablelow,
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(sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
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if (sbr->num_patches > 1)
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memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
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(sbr->num_patches - 1) * sizeof(patch_borders[0]));
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qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
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sizeof(sbr->f_tablelim[0]),
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qsort_comparison_function_int16);
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sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
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while (out < sbr->f_tablelim + sbr->n_lim) {
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if (*in >= *out * lim_bands_per_octave_warped) {
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} else if (*in == *out ||
190
!in_table_int16(patch_borders, sbr->num_patches, *in)) {
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} else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
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sbr->f_tablelim[0] = sbr->f_tablelow[0];
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sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
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static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
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unsigned int cnt = get_bits_count(gb);
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uint8_t bs_header_extra_1;
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uint8_t bs_header_extra_2;
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int old_bs_limiter_bands = sbr->bs_limiter_bands;
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SpectrumParameters old_spectrum_params;
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// Save last spectrum parameters variables to compare to new ones
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memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
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sbr->bs_amp_res_header = get_bits1(gb);
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sbr->spectrum_params.bs_start_freq = get_bits(gb, 4);
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sbr->spectrum_params.bs_stop_freq = get_bits(gb, 4);
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sbr->spectrum_params.bs_xover_band = get_bits(gb, 3);
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skip_bits(gb, 2); // bs_reserved
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bs_header_extra_1 = get_bits1(gb);
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bs_header_extra_2 = get_bits1(gb);
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if (bs_header_extra_1) {
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sbr->spectrum_params.bs_freq_scale = get_bits(gb, 2);
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sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
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sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
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sbr->spectrum_params.bs_freq_scale = 2;
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sbr->spectrum_params.bs_alter_scale = 1;
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sbr->spectrum_params.bs_noise_bands = 2;
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// Check if spectrum parameters changed
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if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
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if (bs_header_extra_2) {
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sbr->bs_limiter_bands = get_bits(gb, 2);
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sbr->bs_limiter_gains = get_bits(gb, 2);
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sbr->bs_interpol_freq = get_bits1(gb);
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sbr->bs_smoothing_mode = get_bits1(gb);
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sbr->bs_limiter_bands = 2;
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sbr->bs_limiter_gains = 2;
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sbr->bs_interpol_freq = 1;
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sbr->bs_smoothing_mode = 1;
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if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
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sbr_make_f_tablelim(sbr);
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return get_bits_count(gb) - cnt;
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static int array_min_int16(const int16_t *array, int nel)
263
int i, min = array[0];
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for (i = 1; i < nel; i++)
265
min = FFMIN(array[i], min);
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static void make_bands(int16_t* bands, int start, int stop, int num_bands)
271
int k, previous, present;
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base = powf((float)stop / start, 1.0f / num_bands);
278
for (k = 0; k < num_bands-1; k++) {
280
present = lrintf(prod);
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bands[k] = present - previous;
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bands[num_bands-1] = stop - previous;
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static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
289
// Requirements (14496-3 sp04 p205)
291
av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
294
if (bs_xover_band >= n_master) {
295
av_log(avctx, AV_LOG_ERROR,
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"Invalid bitstream, crossover band index beyond array bounds: %d\n",
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/// Master Frequency Band Table (14496-3 sp04 p194)
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static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
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SpectrumParameters *spectrum)
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unsigned int temp, max_qmf_subbands;
308
unsigned int start_min, stop_min;
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const int8_t *sbr_offset_ptr;
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if (sbr->sample_rate < 32000) {
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} else if (sbr->sample_rate < 64000) {
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start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
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stop_min = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
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switch (sbr->sample_rate) {
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sbr_offset_ptr = sbr_offset[0];
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sbr_offset_ptr = sbr_offset[1];
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sbr_offset_ptr = sbr_offset[2];
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sbr_offset_ptr = sbr_offset[3];
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case 44100: case 48000: case 64000:
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sbr_offset_ptr = sbr_offset[4];
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case 88200: case 96000: case 128000: case 176400: case 192000:
340
sbr_offset_ptr = sbr_offset[5];
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av_log(ac->avctx, AV_LOG_ERROR,
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"Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
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sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
350
if (spectrum->bs_stop_freq < 14) {
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sbr->k[2] = stop_min;
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make_bands(stop_dk, stop_min, 64, 13);
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qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
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for (k = 0; k < spectrum->bs_stop_freq; k++)
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sbr->k[2] += stop_dk[k];
356
} else if (spectrum->bs_stop_freq == 14) {
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sbr->k[2] = 2*sbr->k[0];
358
} else if (spectrum->bs_stop_freq == 15) {
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sbr->k[2] = 3*sbr->k[0];
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av_log(ac->avctx, AV_LOG_ERROR,
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"Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
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sbr->k[2] = FFMIN(64, sbr->k[2]);
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// Requirements (14496-3 sp04 p205)
368
if (sbr->sample_rate <= 32000) {
369
max_qmf_subbands = 48;
370
} else if (sbr->sample_rate == 44100) {
371
max_qmf_subbands = 35;
372
} else if (sbr->sample_rate >= 48000)
373
max_qmf_subbands = 32;
375
if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
376
av_log(ac->avctx, AV_LOG_ERROR,
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"Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
381
if (!spectrum->bs_freq_scale) {
384
dk = spectrum->bs_alter_scale + 1;
385
sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
386
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
389
for (k = 1; k <= sbr->n_master; k++)
390
sbr->f_master[k] = dk;
392
k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
395
sbr->f_master[2]-= (k2diff < -1);
397
sbr->f_master[sbr->n_master]++;
400
sbr->f_master[0] = sbr->k[0];
401
for (k = 1; k <= sbr->n_master; k++)
402
sbr->f_master[k] += sbr->f_master[k - 1];
405
int half_bands = 7 - spectrum->bs_freq_scale; // bs_freq_scale = {1,2,3}
406
int two_regions, num_bands_0;
407
int vdk0_max, vdk1_min;
410
if (49 * sbr->k[2] > 110 * sbr->k[0]) {
412
sbr->k[1] = 2 * sbr->k[0];
415
sbr->k[1] = sbr->k[2];
418
num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
420
if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
421
av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
427
make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
429
qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
430
vdk0_max = vk0[num_bands_0];
433
for (k = 1; k <= num_bands_0; k++) {
434
if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
435
av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
443
float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
444
: 1.0f; // bs_alter_scale = {0,1}
445
int num_bands_1 = lrintf(half_bands * invwarp *
446
log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
448
make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
450
vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
452
if (vdk1_min < vdk0_max) {
454
qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
455
change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
457
vk1[num_bands_1] -= change;
460
qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
463
for (k = 1; k <= num_bands_1; k++) {
464
if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
465
av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
471
sbr->n_master = num_bands_0 + num_bands_1;
472
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
474
memcpy(&sbr->f_master[0], vk0,
475
(num_bands_0 + 1) * sizeof(sbr->f_master[0]));
476
memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
477
num_bands_1 * sizeof(sbr->f_master[0]));
480
sbr->n_master = num_bands_0;
481
if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
483
memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
490
/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
491
static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
495
int usb = sbr->kx[1];
496
int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
498
sbr->num_patches = 0;
500
if (goal_sb < sbr->kx[1] + sbr->m[1]) {
501
for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
507
for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
508
sb = sbr->f_master[i];
509
odd = (sb + sbr->k[0]) & 1;
512
// Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
513
// After this check the final number of patches can still be six which is
514
// illegal however the Coding Technologies decoder check stream has a final
515
// count of 6 patches
516
if (sbr->num_patches > 5) {
517
av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
521
sbr->patch_num_subbands[sbr->num_patches] = FFMAX(sb - usb, 0);
522
sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
524
if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
531
if (sbr->f_master[k] - sb < 3)
533
} while (sb != sbr->kx[1] + sbr->m[1]);
535
if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
541
/// Derived Frequency Band Tables (14496-3 sp04 p197)
542
static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
546
sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
547
sbr->n[0] = (sbr->n[1] + 1) >> 1;
549
memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
550
(sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
551
sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
552
sbr->kx[1] = sbr->f_tablehigh[0];
554
// Requirements (14496-3 sp04 p205)
555
if (sbr->kx[1] + sbr->m[1] > 64) {
556
av_log(ac->avctx, AV_LOG_ERROR,
557
"Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
560
if (sbr->kx[1] > 32) {
561
av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
565
sbr->f_tablelow[0] = sbr->f_tablehigh[0];
566
temp = sbr->n[1] & 1;
567
for (k = 1; k <= sbr->n[0]; k++)
568
sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
570
sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
571
log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
573
av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
577
sbr->f_tablenoise[0] = sbr->f_tablelow[0];
579
for (k = 1; k <= sbr->n_q; k++) {
580
temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
581
sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
584
if (sbr_hf_calc_npatches(ac, sbr) < 0)
587
sbr_make_f_tablelim(sbr);
589
sbr->data[0].f_indexnoise = 0;
590
sbr->data[1].f_indexnoise = 0;
595
static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
599
for (i = 0; i < elements; i++) {
600
vec[i] = get_bits1(gb);
604
/** ceil(log2(index+1)) */
605
static const int8_t ceil_log2[] = {
609
static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
610
GetBitContext *gb, SBRData *ch_data)
613
unsigned bs_pointer = 0;
614
// frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
615
int abs_bord_trail = 16;
616
int num_rel_lead, num_rel_trail;
617
unsigned bs_num_env_old = ch_data->bs_num_env;
619
ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
620
ch_data->bs_amp_res = sbr->bs_amp_res_header;
621
ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
623
switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
625
ch_data->bs_num_env = 1 << get_bits(gb, 2);
626
num_rel_lead = ch_data->bs_num_env - 1;
627
if (ch_data->bs_num_env == 1)
628
ch_data->bs_amp_res = 0;
630
if (ch_data->bs_num_env > 4) {
631
av_log(ac->avctx, AV_LOG_ERROR,
632
"Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
633
ch_data->bs_num_env);
637
ch_data->t_env[0] = 0;
638
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
640
abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
642
for (i = 0; i < num_rel_lead; i++)
643
ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
645
ch_data->bs_freq_res[1] = get_bits1(gb);
646
for (i = 1; i < ch_data->bs_num_env; i++)
647
ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
650
abs_bord_trail += get_bits(gb, 2);
651
num_rel_trail = get_bits(gb, 2);
652
ch_data->bs_num_env = num_rel_trail + 1;
653
ch_data->t_env[0] = 0;
654
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
656
for (i = 0; i < num_rel_trail; i++)
657
ch_data->t_env[ch_data->bs_num_env - 1 - i] =
658
ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
660
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
662
for (i = 0; i < ch_data->bs_num_env; i++)
663
ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
666
ch_data->t_env[0] = get_bits(gb, 2);
667
num_rel_lead = get_bits(gb, 2);
668
ch_data->bs_num_env = num_rel_lead + 1;
669
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
671
for (i = 0; i < num_rel_lead; i++)
672
ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
674
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
676
get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
679
ch_data->t_env[0] = get_bits(gb, 2);
680
abs_bord_trail += get_bits(gb, 2);
681
num_rel_lead = get_bits(gb, 2);
682
num_rel_trail = get_bits(gb, 2);
683
ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1;
685
if (ch_data->bs_num_env > 5) {
686
av_log(ac->avctx, AV_LOG_ERROR,
687
"Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
688
ch_data->bs_num_env);
692
ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
694
for (i = 0; i < num_rel_lead; i++)
695
ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
696
for (i = 0; i < num_rel_trail; i++)
697
ch_data->t_env[ch_data->bs_num_env - 1 - i] =
698
ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
700
bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
702
get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
706
if (bs_pointer > ch_data->bs_num_env + 1) {
707
av_log(ac->avctx, AV_LOG_ERROR,
708
"Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
713
for (i = 1; i <= ch_data->bs_num_env; i++) {
714
if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
715
av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
720
ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
722
ch_data->t_q[0] = ch_data->t_env[0];
723
ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
724
if (ch_data->bs_num_noise > 1) {
726
if (ch_data->bs_frame_class == FIXFIX) {
727
idx = ch_data->bs_num_env >> 1;
728
} else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
729
idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);
733
else if (bs_pointer == 1)
734
idx = ch_data->bs_num_env - 1;
735
else // bs_pointer > 1
736
idx = bs_pointer - 1;
738
ch_data->t_q[1] = ch_data->t_env[idx];
741
ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
742
ch_data->e_a[1] = -1;
743
if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
744
ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
745
} else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
746
ch_data->e_a[1] = bs_pointer - 1;
751
static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
752
//These variables are saved from the previous frame rather than copied
753
dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env];
754
dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
755
dst->e_a[0] = -(dst->e_a[1] != dst->bs_num_env);
757
//These variables are read from the bitstream and therefore copied
758
memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
759
memcpy(dst->t_env, src->t_env, sizeof(dst->t_env));
760
memcpy(dst->t_q, src->t_q, sizeof(dst->t_q));
761
dst->bs_num_env = src->bs_num_env;
762
dst->bs_amp_res = src->bs_amp_res;
763
dst->bs_num_noise = src->bs_num_noise;
764
dst->bs_frame_class = src->bs_frame_class;
765
dst->e_a[1] = src->e_a[1];
768
/// Read how the envelope and noise floor data is delta coded
769
static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
772
get_bits1_vector(gb, ch_data->bs_df_env, ch_data->bs_num_env);
773
get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
776
/// Read inverse filtering data
777
static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
782
memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
783
for (i = 0; i < sbr->n_q; i++)
784
ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
787
static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
788
SBRData *ch_data, int ch)
792
VLC_TYPE (*t_huff)[2], (*f_huff)[2];
794
const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
795
const int odd = sbr->n[1] & 1;
797
if (sbr->bs_coupling && ch) {
798
if (ch_data->bs_amp_res) {
800
t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
801
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
802
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
803
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
806
t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
807
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
808
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
809
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
812
if (ch_data->bs_amp_res) {
814
t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
815
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
816
f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
817
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
820
t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
821
t_lav = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
822
f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
823
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
827
for (i = 0; i < ch_data->bs_num_env; i++) {
828
if (ch_data->bs_df_env[i]) {
829
// bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
830
if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
831
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
832
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
833
} else if (ch_data->bs_freq_res[i + 1]) {
834
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
835
k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
836
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
839
for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
840
k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
841
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
845
ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
846
for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
847
ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
851
//assign 0th elements of env_facs from last elements
852
memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
853
sizeof(ch_data->env_facs[0]));
856
static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
857
SBRData *ch_data, int ch)
860
VLC_TYPE (*t_huff)[2], (*f_huff)[2];
862
int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
864
if (sbr->bs_coupling && ch) {
865
t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
866
t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
867
f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
868
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
870
t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
871
t_lav = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
872
f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
873
f_lav = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
876
for (i = 0; i < ch_data->bs_num_noise; i++) {
877
if (ch_data->bs_df_noise[i]) {
878
for (j = 0; j < sbr->n_q; j++)
879
ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
881
ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
882
for (j = 1; j < sbr->n_q; j++)
883
ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
887
//assign 0th elements of noise_facs from last elements
888
memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
889
sizeof(ch_data->noise_facs[0]));
892
static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
894
int bs_extension_id, int *num_bits_left)
896
switch (bs_extension_id) {
897
case EXTENSION_ID_PS:
899
av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
900
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
904
*num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
906
av_log_missing_feature(ac->avctx, "Parametric Stereo is", 0);
907
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
913
av_log_missing_feature(ac->avctx, "Reserved SBR extensions are", 1);
914
skip_bits_long(gb, *num_bits_left); // bs_fill_bits
920
static int read_sbr_single_channel_element(AACContext *ac,
921
SpectralBandReplication *sbr,
924
if (get_bits1(gb)) // bs_data_extra
925
skip_bits(gb, 4); // bs_reserved
927
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
929
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
930
read_sbr_invf(sbr, gb, &sbr->data[0]);
931
read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
932
read_sbr_noise(sbr, gb, &sbr->data[0], 0);
934
if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
935
get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
940
static int read_sbr_channel_pair_element(AACContext *ac,
941
SpectralBandReplication *sbr,
944
if (get_bits1(gb)) // bs_data_extra
945
skip_bits(gb, 8); // bs_reserved
947
if ((sbr->bs_coupling = get_bits1(gb))) {
948
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
950
copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
951
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
952
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
953
read_sbr_invf(sbr, gb, &sbr->data[0]);
954
memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
955
memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
956
read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
957
read_sbr_noise(sbr, gb, &sbr->data[0], 0);
958
read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
959
read_sbr_noise(sbr, gb, &sbr->data[1], 1);
961
if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
962
read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
964
read_sbr_dtdf(sbr, gb, &sbr->data[0]);
965
read_sbr_dtdf(sbr, gb, &sbr->data[1]);
966
read_sbr_invf(sbr, gb, &sbr->data[0]);
967
read_sbr_invf(sbr, gb, &sbr->data[1]);
968
read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
969
read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
970
read_sbr_noise(sbr, gb, &sbr->data[0], 0);
971
read_sbr_noise(sbr, gb, &sbr->data[1], 1);
974
if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
975
get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
976
if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
977
get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
982
static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
983
GetBitContext *gb, int id_aac)
985
unsigned int cnt = get_bits_count(gb);
987
if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
988
if (read_sbr_single_channel_element(ac, sbr, gb)) {
990
return get_bits_count(gb) - cnt;
992
} else if (id_aac == TYPE_CPE) {
993
if (read_sbr_channel_pair_element(ac, sbr, gb)) {
995
return get_bits_count(gb) - cnt;
998
av_log(ac->avctx, AV_LOG_ERROR,
999
"Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1001
return get_bits_count(gb) - cnt;
1003
if (get_bits1(gb)) { // bs_extended_data
1004
int num_bits_left = get_bits(gb, 4); // bs_extension_size
1005
if (num_bits_left == 15)
1006
num_bits_left += get_bits(gb, 8); // bs_esc_count
1008
num_bits_left <<= 3;
1009
while (num_bits_left > 7) {
1011
read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1013
if (num_bits_left < 0) {
1014
av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
1016
if (num_bits_left > 0)
1017
skip_bits(gb, num_bits_left);
1020
return get_bits_count(gb) - cnt;
1023
static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1026
err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1028
err = sbr_make_f_derived(ac, sbr);
1030
av_log(ac->avctx, AV_LOG_ERROR,
1031
"SBR reset failed. Switching SBR to pure upsampling mode.\n");
1037
* Decode Spectral Band Replication extension data; reference: table 4.55.
1039
* @param crc flag indicating the presence of CRC checksum
1040
* @param cnt length of TYPE_FIL syntactic element in bytes
1042
* @return Returns number of bytes consumed from the TYPE_FIL element.
1044
int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1045
GetBitContext *gb_host, int crc, int cnt, int id_aac)
1047
unsigned int num_sbr_bits = 0, num_align_bits;
1048
unsigned bytes_read;
1049
GetBitContext gbc = *gb_host, *gb = &gbc;
1050
skip_bits_long(gb_host, cnt*8 - 4);
1054
if (!sbr->sample_rate)
1055
sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1056
if (!ac->m4ac.ext_sample_rate)
1057
ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
1060
skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1064
//Save some state from the previous frame.
1065
sbr->kx[0] = sbr->kx[1];
1066
sbr->m[0] = sbr->m[1];
1069
if (get_bits1(gb)) // bs_header_flag
1070
num_sbr_bits += read_sbr_header(sbr, gb);
1076
num_sbr_bits += read_sbr_data(ac, sbr, gb, id_aac);
1078
num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1079
bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1081
if (bytes_read > cnt) {
1082
av_log(ac->avctx, AV_LOG_ERROR,
1083
"Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1088
/// Dequantization and stereo decoding (14496-3 sp04 p203)
1089
static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1094
if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1095
float alpha = sbr->data[0].bs_amp_res ? 1.0f : 0.5f;
1096
float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1097
for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
1098
for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1099
float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1100
float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1101
float fac = temp1 / (1.0f + temp2);
1102
sbr->data[0].env_facs[e][k] = fac;
1103
sbr->data[1].env_facs[e][k] = fac * temp2;
1106
for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1107
for (k = 0; k < sbr->n_q; k++) {
1108
float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1109
float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1110
float fac = temp1 / (1.0f + temp2);
1111
sbr->data[0].noise_facs[e][k] = fac;
1112
sbr->data[1].noise_facs[e][k] = fac * temp2;
1115
} else { // SCE or one non-coupled CPE
1116
for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1117
float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1118
for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
1119
for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1120
sbr->data[ch].env_facs[e][k] =
1121
exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1122
for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1123
for (k = 0; k < sbr->n_q; k++)
1124
sbr->data[ch].noise_facs[e][k] =
1125
exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1131
* Analysis QMF Bank (14496-3 sp04 p206)
1133
* @param x pointer to the beginning of the first sample window
1134
* @param W array of complex-valued samples split into subbands
1136
static void sbr_qmf_analysis(DSPContext *dsp, FFTContext *mdct, const float *in, float *x,
1137
float z[320], float W[2][32][32][2],
1141
memcpy(W[0], W[1], sizeof(W[0]));
1142
memcpy(x , x+1024, (320-32)*sizeof(x[0]));
1144
dsp->vector_fmul_scalar(x+288, in, scale, 1024);
1146
memcpy(x+288, in, 1024*sizeof(*x));
1147
for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1148
// are not supported
1149
dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1150
for (k = 0; k < 64; k++) {
1151
float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
1156
for (k = 1; k < 32; k++) {
1157
z[64+2*k-1] = z[ k];
1158
z[64+2*k ] = -z[64-k];
1162
ff_imdct_half(mdct, z, z+64);
1163
for (k = 0; k < 32; k++) {
1164
W[1][i][k][0] = -z[63-k];
1165
W[1][i][k][1] = z[k];
1172
* Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1173
* (14496-3 sp04 p206)
1175
static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1176
float *out, float X[2][38][64],
1177
float mdct_buf[2][64],
1178
float *v0, int *v_off, const unsigned int div,
1179
float bias, float scale)
1182
const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1183
int scale_and_bias = scale != 1.0f || bias != 0.0f;
1185
for (i = 0; i < 32; i++) {
1187
int saved_samples = (1280 - 128) >> div;
1188
memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1189
*v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
1191
*v_off -= 128 >> div;
1195
for (n = 0; n < 32; n++) {
1196
X[0][i][ n] = -X[0][i][n];
1197
X[0][i][32+n] = X[1][i][31-n];
1199
ff_imdct_half(mdct, mdct_buf[0], X[0][i]);
1200
for (n = 0; n < 32; n++) {
1201
v[ n] = mdct_buf[0][63 - 2*n];
1202
v[63 - n] = -mdct_buf[0][62 - 2*n];
1205
for (n = 1; n < 64; n+=2) {
1206
X[1][i][n] = -X[1][i][n];
1208
ff_imdct_half(mdct, mdct_buf[0], X[0][i]);
1209
ff_imdct_half(mdct, mdct_buf[1], X[1][i]);
1210
for (n = 0; n < 64; n++) {
1211
v[ n] = -mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1212
v[127 - n] = mdct_buf[0][63 - n] + mdct_buf[1][ n ];
1215
dsp->vector_fmul_add(out, v , sbr_qmf_window , zero64, 64 >> div);
1216
dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out , 64 >> div);
1217
dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out , 64 >> div);
1218
dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out , 64 >> div);
1219
dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out , 64 >> div);
1220
dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out , 64 >> div);
1221
dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out , 64 >> div);
1222
dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out , 64 >> div);
1223
dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out , 64 >> div);
1224
dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out , 64 >> div);
1226
for (n = 0; n < 64 >> div; n++)
1227
out[n] = out[n] * scale + bias;
1232
static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag)
1235
float real_sum = 0.0f;
1236
float imag_sum = 0.0f;
1238
for (i = 1; i < 38; i++) {
1239
real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
1240
imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
1242
phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
1243
phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
1245
phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
1246
phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
1249
for (i = 1; i < 38; i++) {
1250
real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
1252
phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
1253
phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
1257
/** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1258
* (14496-3 sp04 p214)
1259
* Warning: This routine does not seem numerically stable.
1261
static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2],
1262
const float X_low[32][40][2], int k0)
1265
for (k = 0; k < k0; k++) {
1266
float phi[3][2][2], dk;
1268
autocorrelate(X_low[k], phi, 0);
1269
autocorrelate(X_low[k], phi, 1);
1270
autocorrelate(X_low[k], phi, 2);
1272
dk = phi[2][1][0] * phi[1][0][0] -
1273
(phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1279
float temp_real, temp_im;
1280
temp_real = phi[0][0][0] * phi[1][1][0] -
1281
phi[0][0][1] * phi[1][1][1] -
1282
phi[0][1][0] * phi[1][0][0];
1283
temp_im = phi[0][0][0] * phi[1][1][1] +
1284
phi[0][0][1] * phi[1][1][0] -
1285
phi[0][1][1] * phi[1][0][0];
1287
alpha1[k][0] = temp_real / dk;
1288
alpha1[k][1] = temp_im / dk;
1291
if (!phi[1][0][0]) {
1295
float temp_real, temp_im;
1296
temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1297
alpha1[k][1] * phi[1][1][1];
1298
temp_im = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1299
alpha1[k][0] * phi[1][1][1];
1301
alpha0[k][0] = -temp_real / phi[1][0][0];
1302
alpha0[k][1] = -temp_im / phi[1][0][0];
1305
if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1306
alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1315
/// Chirp Factors (14496-3 sp04 p214)
1316
static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1320
static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1322
for (i = 0; i < sbr->n_q; i++) {
1323
if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1326
new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1328
if (new_bw < ch_data->bw_array[i]) {
1329
new_bw = 0.75f * new_bw + 0.25f * ch_data->bw_array[i];
1331
new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1332
ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1336
/// Generate the subband filtered lowband
1337
static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1338
float X_low[32][40][2], const float W[2][32][32][2])
1341
const int t_HFGen = 8;
1343
memset(X_low, 0, 32*sizeof(*X_low));
1344
for (k = 0; k < sbr->kx[1]; k++) {
1345
for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1346
X_low[k][i][0] = W[1][i - t_HFGen][k][0];
1347
X_low[k][i][1] = W[1][i - t_HFGen][k][1];
1350
for (k = 0; k < sbr->kx[0]; k++) {
1351
for (i = 0; i < t_HFGen; i++) {
1352
X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
1353
X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
1359
/// High Frequency Generator (14496-3 sp04 p215)
1360
static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1361
float X_high[64][40][2], const float X_low[32][40][2],
1362
const float (*alpha0)[2], const float (*alpha1)[2],
1363
const float bw_array[5], const uint8_t *t_env,
1369
for (j = 0; j < sbr->num_patches; j++) {
1370
for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1372
const int p = sbr->patch_start_subband[j] + x;
1373
while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1378
av_log(ac->avctx, AV_LOG_ERROR,
1379
"ERROR : no subband found for frequency %d\n", k);
1383
alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g];
1384
alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g];
1385
alpha[2] = alpha0[p][0] * bw_array[g];
1386
alpha[3] = alpha0[p][1] * bw_array[g];
1388
for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) {
1389
const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET;
1391
X_low[p][idx - 2][0] * alpha[0] -
1392
X_low[p][idx - 2][1] * alpha[1] +
1393
X_low[p][idx - 1][0] * alpha[2] -
1394
X_low[p][idx - 1][1] * alpha[3] +
1397
X_low[p][idx - 2][1] * alpha[0] +
1398
X_low[p][idx - 2][0] * alpha[1] +
1399
X_low[p][idx - 1][1] * alpha[2] +
1400
X_low[p][idx - 1][0] * alpha[3] +
1405
if (k < sbr->m[1] + sbr->kx[1])
1406
memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1411
/// Generate the subband filtered lowband
1412
static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
1413
const float X_low[32][40][2], const float Y[2][38][64][2],
1418
const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1419
memset(X, 0, 2*sizeof(*X));
1420
for (k = 0; k < sbr->kx[0]; k++) {
1421
for (i = 0; i < i_Temp; i++) {
1422
X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1423
X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1426
for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1427
for (i = 0; i < i_Temp; i++) {
1428
X[0][i][k] = Y[0][i + i_f][k][0];
1429
X[1][i][k] = Y[0][i + i_f][k][1];
1433
for (k = 0; k < sbr->kx[1]; k++) {
1434
for (i = i_Temp; i < 38; i++) {
1435
X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1436
X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1439
for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1440
for (i = i_Temp; i < i_f; i++) {
1441
X[0][i][k] = Y[1][i][k][0];
1442
X[1][i][k] = Y[1][i][k][1];
1448
/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1449
* (14496-3 sp04 p217)
1451
static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1452
SBRData *ch_data, int e_a[2])
1456
memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1457
for (e = 0; e < ch_data->bs_num_env; e++) {
1458
const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1459
uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1462
for (i = 0; i < ilim; i++)
1463
for (m = table[i]; m < table[i + 1]; m++)
1464
sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1466
// ch_data->bs_num_noise > 1 => 2 noise floors
1467
k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1468
for (i = 0; i < sbr->n_q; i++)
1469
for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1470
sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1472
for (i = 0; i < sbr->n[1]; i++) {
1473
if (ch_data->bs_add_harmonic_flag) {
1474
const unsigned int m_midpoint =
1475
(sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1477
ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1478
(e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1482
for (i = 0; i < ilim; i++) {
1483
int additional_sinusoid_present = 0;
1484
for (m = table[i]; m < table[i + 1]; m++) {
1485
if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1486
additional_sinusoid_present = 1;
1490
memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1491
(table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1495
memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
1498
/// Estimation of current envelope (14496-3 sp04 p218)
1499
static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1500
SpectralBandReplication *sbr, SBRData *ch_data)
1504
if (sbr->bs_interpol_freq) {
1505
for (e = 0; e < ch_data->bs_num_env; e++) {
1506
const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1507
int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1508
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1510
for (m = 0; m < sbr->m[1]; m++) {
1513
for (i = ilb; i < iub; i++) {
1514
sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] +
1515
X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1];
1517
e_curr[e][m] = sum * recip_env_size;
1523
for (e = 0; e < ch_data->bs_num_env; e++) {
1524
const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1525
int ilb = ch_data->t_env[e] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1526
int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1527
const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1529
for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1531
const int den = env_size * (table[p + 1] - table[p]);
1533
for (k = table[p]; k < table[p + 1]; k++) {
1534
for (i = ilb; i < iub; i++) {
1535
sum += X_high[k][i][0] * X_high[k][i][0] +
1536
X_high[k][i][1] * X_high[k][i][1];
1540
for (k = table[p]; k < table[p + 1]; k++) {
1541
e_curr[e][k - sbr->kx[1]] = sum;
1549
* Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1550
* and Calculation of gain (14496-3 sp04 p219)
1552
static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1553
SBRData *ch_data, const int e_a[2])
1556
// max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1557
static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1559
for (e = 0; e < ch_data->bs_num_env; e++) {
1560
int delta = !((e == e_a[1]) || (e == e_a[0]));
1561
for (k = 0; k < sbr->n_lim; k++) {
1562
float gain_boost, gain_max;
1563
float sum[2] = { 0.0f, 0.0f };
1564
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1565
const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1566
sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1567
sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1568
if (!sbr->s_mapped[e][m]) {
1569
sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1570
((1.0f + sbr->e_curr[e][m]) *
1571
(1.0f + sbr->q_mapped[e][m] * delta)));
1573
sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1574
((1.0f + sbr->e_curr[e][m]) *
1575
(1.0f + sbr->q_mapped[e][m])));
1578
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1579
sum[0] += sbr->e_origmapped[e][m];
1580
sum[1] += sbr->e_curr[e][m];
1582
gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1583
gain_max = FFMIN(100000, gain_max);
1584
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1585
float q_m_max = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1586
sbr->q_m[e][m] = FFMIN(sbr->q_m[e][m], q_m_max);
1587
sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1589
sum[0] = sum[1] = 0.0f;
1590
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1591
sum[0] += sbr->e_origmapped[e][m];
1592
sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1593
+ sbr->s_m[e][m] * sbr->s_m[e][m]
1594
+ (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1596
gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1597
gain_boost = FFMIN(1.584893192, gain_boost);
1598
for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1599
sbr->gain[e][m] *= gain_boost;
1600
sbr->q_m[e][m] *= gain_boost;
1601
sbr->s_m[e][m] *= gain_boost;
1607
/// Assembling HF Signals (14496-3 sp04 p220)
1608
static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2],
1609
SpectralBandReplication *sbr, SBRData *ch_data,
1613
const int h_SL = 4 * !sbr->bs_smoothing_mode;
1614
const int kx = sbr->kx[1];
1615
const int m_max = sbr->m[1];
1616
static const float h_smooth[5] = {
1623
static const int8_t phi[2][4] = {
1624
{ 1, 0, -1, 0}, // real
1625
{ 0, 1, 0, -1}, // imaginary
1627
float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1628
int indexnoise = ch_data->f_indexnoise;
1629
int indexsine = ch_data->f_indexsine;
1630
memcpy(Y[0], Y[1], sizeof(Y[0]));
1633
for (i = 0; i < h_SL; i++) {
1634
memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1635
memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0], m_max * sizeof(sbr->q_m[0][0]));
1638
memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1639
memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1642
for (e = 0; e < ch_data->bs_num_env; e++) {
1643
for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1644
memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1645
memcpy(q_temp[h_SL + i], sbr->q_m[e], m_max * sizeof(sbr->q_m[0][0]));
1649
for (e = 0; e < ch_data->bs_num_env; e++) {
1650
for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1651
int phi_sign = (1 - 2*(kx & 1));
1653
if (h_SL && e != e_a[0] && e != e_a[1]) {
1654
for (m = 0; m < m_max; m++) {
1655
const int idx1 = i + h_SL;
1656
float g_filt = 0.0f;
1657
for (j = 0; j <= h_SL; j++)
1658
g_filt += g_temp[idx1 - j][m] * h_smooth[j];
1659
Y[1][i][m + kx][0] =
1660
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1661
Y[1][i][m + kx][1] =
1662
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1665
for (m = 0; m < m_max; m++) {
1666
const float g_filt = g_temp[i + h_SL][m];
1667
Y[1][i][m + kx][0] =
1668
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1669
Y[1][i][m + kx][1] =
1670
X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1674
if (e != e_a[0] && e != e_a[1]) {
1675
for (m = 0; m < m_max; m++) {
1676
indexnoise = (indexnoise + 1) & 0x1ff;
1677
if (sbr->s_m[e][m]) {
1678
Y[1][i][m + kx][0] +=
1679
sbr->s_m[e][m] * phi[0][indexsine];
1680
Y[1][i][m + kx][1] +=
1681
sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1685
const int idx1 = i + h_SL;
1687
for (j = 0; j <= h_SL; j++)
1688
q_filt += q_temp[idx1 - j][m] * h_smooth[j];
1690
q_filt = q_temp[i][m];
1692
Y[1][i][m + kx][0] +=
1693
q_filt * sbr_noise_table[indexnoise][0];
1694
Y[1][i][m + kx][1] +=
1695
q_filt * sbr_noise_table[indexnoise][1];
1697
phi_sign = -phi_sign;
1700
indexnoise = (indexnoise + m_max) & 0x1ff;
1701
for (m = 0; m < m_max; m++) {
1702
Y[1][i][m + kx][0] +=
1703
sbr->s_m[e][m] * phi[0][indexsine];
1704
Y[1][i][m + kx][1] +=
1705
sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1706
phi_sign = -phi_sign;
1709
indexsine = (indexsine + 1) & 3;
1712
ch_data->f_indexnoise = indexnoise;
1713
ch_data->f_indexsine = indexsine;
1716
void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
1719
int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
1721
int nch = (id_aac == TYPE_CPE) ? 2 : 1;
1724
sbr_dequant(sbr, id_aac);
1726
for (ch = 0; ch < nch; ch++) {
1727
/* decode channel */
1728
sbr_qmf_analysis(&ac->dsp, &sbr->mdct_ana, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
1729
(float*)sbr->qmf_filter_scratch,
1730
sbr->data[ch].W, 1/(-1024 * ac->sf_scale));
1731
sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
1733
sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1734
sbr_chirp(sbr, &sbr->data[ch]);
1735
sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1736
sbr->data[ch].bw_array, sbr->data[ch].t_env,
1737
sbr->data[ch].bs_num_env);
1740
sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1741
sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1742
sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1743
sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch],
1748
sbr_x_gen(sbr, sbr->X[ch], sbr->X_low, sbr->data[ch].Y, ch);
1751
if (ac->m4ac.ps == 1) {
1752
if (sbr->ps.start) {
1753
ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
1755
memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
1760
sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, L, sbr->X[0], sbr->qmf_filter_scratch,
1761
sbr->data[0].synthesis_filterbank_samples,
1762
&sbr->data[0].synthesis_filterbank_samples_offset,
1764
ac->add_bias, -1024 * ac->sf_scale);
1766
sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, R, sbr->X[1], sbr->qmf_filter_scratch,
1767
sbr->data[1].synthesis_filterbank_samples,
1768
&sbr->data[1].synthesis_filterbank_samples_offset,
1770
ac->add_bias, -1024 * ac->sf_scale);