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FFmpeg/libavcodec/aacsbr_template.c

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  1. /*

  2.  * AAC Spectral Band Replication decoding functions

  3.  * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )

  4.  * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>

  5.  *

  6.  * Fixed point code

  7.  * Copyright (c) 2013

  8.  *      MIPS Technologies, Inc., California.

  9.  *

  10.  * This file is part of FFmpeg.

  11.  *

  12.  * FFmpeg is free software; you can redistribute it and/or

  13.  * modify it under the terms of the GNU Lesser General Public

  14.  * License as published by the Free Software Foundation; either

  15.  * version 2.1 of the License, or (at your option) any later version.

  16.  *

  17.  * FFmpeg is distributed in the hope that it will be useful,

  18.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  19.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  20.  * Lesser General Public License for more details.

  21.  *

  22.  * You should have received a copy of the GNU Lesser General Public

  23.  * License along with FFmpeg; if not, write to the Free Software

  24.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  25.  */

  26. 

  27. /**

  28.  * @file

  29.  * AAC Spectral Band Replication decoding functions

  30.  * @author Robert Swain ( rob opendot cl )

  31.  * @author Stanislav Ocovaj ( stanislav.ocovaj@imgtec.com )

  32.  * @author Zoran Basaric ( zoran.basaric@imgtec.com )

  33.  */

  34. 

  35. #include "libavutil/qsort.h"

  36. 

  37. av_cold void AAC_RENAME(ff_aac_sbr_init)(void)

  38. {

  39.     static const struct {

  40.         const void *sbr_codes, *sbr_bits;

  41.         const unsigned int table_size, elem_size;

  42.     } sbr_tmp[] = {

  43.         SBR_VLC_ROW(t_huffman_env_1_5dB),

  44.         SBR_VLC_ROW(f_huffman_env_1_5dB),

  45.         SBR_VLC_ROW(t_huffman_env_bal_1_5dB),

  46.         SBR_VLC_ROW(f_huffman_env_bal_1_5dB),

  47.         SBR_VLC_ROW(t_huffman_env_3_0dB),

  48.         SBR_VLC_ROW(f_huffman_env_3_0dB),

  49.         SBR_VLC_ROW(t_huffman_env_bal_3_0dB),

  50.         SBR_VLC_ROW(f_huffman_env_bal_3_0dB),

  51.         SBR_VLC_ROW(t_huffman_noise_3_0dB),

  52.         SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),

  53.     };

  54. 

  55.     // SBR VLC table initialization

  56.     SBR_INIT_VLC_STATIC(0, 1098);

  57.     SBR_INIT_VLC_STATIC(1, 1092);

  58.     SBR_INIT_VLC_STATIC(2, 768);

  59.     SBR_INIT_VLC_STATIC(3, 1026);

  60.     SBR_INIT_VLC_STATIC(4, 1058);

  61.     SBR_INIT_VLC_STATIC(5, 1052);

  62.     SBR_INIT_VLC_STATIC(6, 544);

  63.     SBR_INIT_VLC_STATIC(7, 544);

  64.     SBR_INIT_VLC_STATIC(8, 592);

  65.     SBR_INIT_VLC_STATIC(9, 512);

  66. 

  67.     aacsbr_tableinit();

  68. 

  69.     AAC_RENAME(ff_ps_init)();

  70. }

  71. 

  72. /** Places SBR in pure upsampling mode. */

  73. static void sbr_turnoff(SpectralBandReplication *sbr) {

  74.     sbr->start = 0;

  75.     sbr->ready_for_dequant = 0;

  76.     // Init defults used in pure upsampling mode

  77.     sbr->kx[1] = 32; //Typo in spec, kx' inits to 32

  78.     sbr->m[1] = 0;

  79.     // Reset values for first SBR header

  80.     sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;

  81.     memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));

  82. }

  83. 

  84. av_cold void AAC_RENAME(ff_aac_sbr_ctx_init)(AACContext *ac, SpectralBandReplication *sbr)

  85. {

  86.     if(sbr->mdct.mdct_bits)

  87.         return;

  88.     sbr->kx[0] = sbr->kx[1];

  89.     sbr_turnoff(sbr);

  90.     sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);

  91.     sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);

  92.     /* SBR requires samples to be scaled to +/-32768.0 to work correctly.

  93.      * mdct scale factors are adjusted to scale up from +/-1.0 at analysis

  94.      * and scale back down at synthesis. */

  95.     AAC_RENAME_32(ff_mdct_init)(&sbr->mdct,     7, 1, 1.0 / (64 * 32768.0));

  96.     AAC_RENAME_32(ff_mdct_init)(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);

  97.     AAC_RENAME(ff_ps_ctx_init)(&sbr->ps);

  98.     AAC_RENAME(ff_sbrdsp_init)(&sbr->dsp);

  99.     aacsbr_func_ptr_init(&sbr->c);

  100. }

  101. 

  102. av_cold void AAC_RENAME(ff_aac_sbr_ctx_close)(SpectralBandReplication *sbr)

  103. {

  104.     AAC_RENAME_32(ff_mdct_end)(&sbr->mdct);

  105.     AAC_RENAME_32(ff_mdct_end)(&sbr->mdct_ana);

  106. }

  107. 

  108. static int qsort_comparison_function_int16(const void *a, const void *b)

  109. {

  110.     return *(const int16_t *)a - *(const int16_t *)b;

  111. }

  112. 

  113. static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)

  114. {

  115.     int i;

  116.     for (i = 0; i <= last_el; i++)

  117.         if (table[i] == needle)

  118.             return 1;

  119.     return 0;

  120. }

  121. 

  122. /// Limiter Frequency Band Table (14496-3 sp04 p198)

  123. static void sbr_make_f_tablelim(SpectralBandReplication *sbr)

  124. {

  125.     int k;

  126.     if (sbr->bs_limiter_bands > 0) {

  127.         static const INTFLOAT bands_warped[3] = { Q23(1.32715174233856803909f),   //2^(0.49/1.2)

  128.                                                Q23(1.18509277094158210129f),   //2^(0.49/2)

  129.                                                Q23(1.11987160404675912501f) }; //2^(0.49/3)

  130.         const INTFLOAT lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];

  131.         int16_t patch_borders[7];

  132.         uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;

  133. 

  134.         patch_borders[0] = sbr->kx[1];

  135.         for (k = 1; k <= sbr->num_patches; k++)

  136.             patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];

  137. 

  138.         memcpy(sbr->f_tablelim, sbr->f_tablelow,

  139.                (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));

  140.         if (sbr->num_patches > 1)

  141.             memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,

  142.                    (sbr->num_patches - 1) * sizeof(patch_borders[0]));

  143. 

  144.         AV_QSORT(sbr->f_tablelim, sbr->num_patches + sbr->n[0],

  145.               uint16_t,

  146.               qsort_comparison_function_int16);

  147. 

  148.         sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;

  149.         while (out < sbr->f_tablelim + sbr->n_lim) {

  150. #if USE_FIXED

  151.             if ((*in << 23) >= *out * lim_bands_per_octave_warped) {

  152. #else

  153.             if (*in >= *out * lim_bands_per_octave_warped) {

  154. #endif /* USE_FIXED */

  155.                 *++out = *in++;

  156.             } else if (*in == *out ||

  157.                 !in_table_int16(patch_borders, sbr->num_patches, *in)) {

  158.                 in++;

  159.                 sbr->n_lim--;

  160.             } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {

  161.                 *out = *in++;

  162.                 sbr->n_lim--;

  163.             } else {

  164.                 *++out = *in++;

  165.             }

  166.         }

  167.     } else {

  168.         sbr->f_tablelim[0] = sbr->f_tablelow[0];

  169.         sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];

  170.         sbr->n_lim = 1;

  171.     }

  172. }

  173. 

  174. static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)

  175. {

  176.     unsigned int cnt = get_bits_count(gb);

  177.     uint8_t bs_header_extra_1;

  178.     uint8_t bs_header_extra_2;

  179.     int old_bs_limiter_bands = sbr->bs_limiter_bands;

  180.     SpectrumParameters old_spectrum_params;

  181. 

  182.     sbr->start = 1;

  183.     sbr->ready_for_dequant = 0;

  184. 

  185.     // Save last spectrum parameters variables to compare to new ones

  186.     memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));

  187. 

  188.     sbr->bs_amp_res_header              = get_bits1(gb);

  189.     sbr->spectrum_params.bs_start_freq  = get_bits(gb, 4);

  190.     sbr->spectrum_params.bs_stop_freq   = get_bits(gb, 4);

  191.     sbr->spectrum_params.bs_xover_band  = get_bits(gb, 3);

  192.                                           skip_bits(gb, 2); // bs_reserved

  193. 

  194.     bs_header_extra_1 = get_bits1(gb);

  195.     bs_header_extra_2 = get_bits1(gb);

  196. 

  197.     if (bs_header_extra_1) {

  198.         sbr->spectrum_params.bs_freq_scale  = get_bits(gb, 2);

  199.         sbr->spectrum_params.bs_alter_scale = get_bits1(gb);

  200.         sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);

  201.     } else {

  202.         sbr->spectrum_params.bs_freq_scale  = 2;

  203.         sbr->spectrum_params.bs_alter_scale = 1;

  204.         sbr->spectrum_params.bs_noise_bands = 2;

  205.     }

  206. 

  207.     // Check if spectrum parameters changed

  208.     if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))

  209.         sbr->reset = 1;

  210. 

  211.     if (bs_header_extra_2) {

  212.         sbr->bs_limiter_bands  = get_bits(gb, 2);

  213.         sbr->bs_limiter_gains  = get_bits(gb, 2);

  214.         sbr->bs_interpol_freq  = get_bits1(gb);

  215.         sbr->bs_smoothing_mode = get_bits1(gb);

  216.     } else {

  217.         sbr->bs_limiter_bands  = 2;

  218.         sbr->bs_limiter_gains  = 2;

  219.         sbr->bs_interpol_freq  = 1;

  220.         sbr->bs_smoothing_mode = 1;

  221.     }

  222. 

  223.     if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)

  224.         sbr_make_f_tablelim(sbr);

  225. 

  226.     return get_bits_count(gb) - cnt;

  227. }

  228. 

  229. static int array_min_int16(const int16_t *array, int nel)

  230. {

  231.     int i, min = array[0];

  232.     for (i = 1; i < nel; i++)

  233.         min = FFMIN(array[i], min);

  234.     return min;

  235. }

  236. 

  237. static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)

  238. {

  239.     // Requirements (14496-3 sp04 p205)

  240.     if (n_master <= 0) {

  241.         av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);

  242.         return -1;

  243.     }

  244.     if (bs_xover_band >= n_master) {

  245.         av_log(avctx, AV_LOG_ERROR,

  246.                "Invalid bitstream, crossover band index beyond array bounds: %d\n",

  247.                bs_xover_band);

  248.         return -1;

  249.     }

  250.     return 0;

  251. }

  252. 

  253. /// Master Frequency Band Table (14496-3 sp04 p194)

  254. static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,

  255.                              SpectrumParameters *spectrum)

  256. {

  257.     unsigned int temp, max_qmf_subbands = 0;

  258.     unsigned int start_min, stop_min;

  259.     int k;

  260.     const int8_t *sbr_offset_ptr;

  261.     int16_t stop_dk[13];

  262. 

  263.     if (sbr->sample_rate < 32000) {

  264.         temp = 3000;

  265.     } else if (sbr->sample_rate < 64000) {

  266.         temp = 4000;

  267.     } else

  268.         temp = 5000;

  269. 

  270.     switch (sbr->sample_rate) {

  271.     case 16000:

  272.         sbr_offset_ptr = sbr_offset[0];

  273.         break;

  274.     case 22050:

  275.         sbr_offset_ptr = sbr_offset[1];

  276.         break;

  277.     case 24000:

  278.         sbr_offset_ptr = sbr_offset[2];

  279.         break;

  280.     case 32000:

  281.         sbr_offset_ptr = sbr_offset[3];

  282.         break;

  283.     case 44100: case 48000: case 64000:

  284.         sbr_offset_ptr = sbr_offset[4];

  285.         break;

  286.     case 88200: case 96000: case 128000: case 176400: case 192000:

  287.         sbr_offset_ptr = sbr_offset[5];

  288.         break;

  289.     default:

  290.         av_log(ac->avctx, AV_LOG_ERROR,

  291.                "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);

  292.         return -1;

  293.     }

  294. 

  295.     start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;

  296.     stop_min  = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;

  297. 

  298.     sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];

  299. 

  300.     if (spectrum->bs_stop_freq < 14) {

  301.         sbr->k[2] = stop_min;

  302.         make_bands(stop_dk, stop_min, 64, 13);

  303.         AV_QSORT(stop_dk, 13, int16_t, qsort_comparison_function_int16);

  304.         for (k = 0; k < spectrum->bs_stop_freq; k++)

  305.             sbr->k[2] += stop_dk[k];

  306.     } else if (spectrum->bs_stop_freq == 14) {

  307.         sbr->k[2] = 2*sbr->k[0];

  308.     } else if (spectrum->bs_stop_freq == 15) {

  309.         sbr->k[2] = 3*sbr->k[0];

  310.     } else {

  311.         av_log(ac->avctx, AV_LOG_ERROR,

  312.                "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);

  313.         return -1;

  314.     }

  315.     sbr->k[2] = FFMIN(64, sbr->k[2]);

  316. 

  317.     // Requirements (14496-3 sp04 p205)

  318.     if (sbr->sample_rate <= 32000) {

  319.         max_qmf_subbands = 48;

  320.     } else if (sbr->sample_rate == 44100) {

  321.         max_qmf_subbands = 35;

  322.     } else if (sbr->sample_rate >= 48000)

  323.         max_qmf_subbands = 32;

  324.     else

  325.         av_assert0(0);

  326. 

  327.     if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {

  328.         av_log(ac->avctx, AV_LOG_ERROR,

  329.                "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);

  330.         return -1;

  331.     }

  332. 

  333.     if (!spectrum->bs_freq_scale) {

  334.         int dk, k2diff;

  335. 

  336.         dk = spectrum->bs_alter_scale + 1;

  337.         sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;

  338.         if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))

  339.             return -1;

  340. 

  341.         for (k = 1; k <= sbr->n_master; k++)

  342.             sbr->f_master[k] = dk;

  343. 

  344.         k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;

  345.         if (k2diff < 0) {

  346.             sbr->f_master[1]--;

  347.             sbr->f_master[2]-= (k2diff < -1);

  348.         } else if (k2diff) {

  349.             sbr->f_master[sbr->n_master]++;

  350.         }

  351. 

  352.         sbr->f_master[0] = sbr->k[0];

  353.         for (k = 1; k <= sbr->n_master; k++)

  354.             sbr->f_master[k] += sbr->f_master[k - 1];

  355. 

  356.     } else {

  357.         int half_bands = 7 - spectrum->bs_freq_scale;      // bs_freq_scale  = {1,2,3}

  358.         int two_regions, num_bands_0;

  359.         int vdk0_max, vdk1_min;

  360.         int16_t vk0[49];

  361. #if USE_FIXED

  362.         int tmp, nz = 0;

  363. #endif /* USE_FIXED */

  364. 

  365.         if (49 * sbr->k[2] > 110 * sbr->k[0]) {

  366.             two_regions = 1;

  367.             sbr->k[1] = 2 * sbr->k[0];

  368.         } else {

  369.             two_regions = 0;

  370.             sbr->k[1] = sbr->k[2];

  371.         }

  372. 

  373. #if USE_FIXED

  374.         tmp = (sbr->k[1] << 23) / sbr->k[0];

  375.         while (tmp < 0x40000000) {

  376.           tmp <<= 1;

  377.           nz++;

  378.         }

  379.         tmp = fixed_log(tmp - 0x80000000);

  380.         tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30);

  381.         tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands;

  382.         num_bands_0 = ((tmp + 0x400000) >> 23) * 2;

  383. #else

  384.         num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;

  385. #endif /* USE_FIXED */

  386. 

  387.         if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)

  388.             av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);

  389.             return -1;

  390.         }

  391. 

  392.         vk0[0] = 0;

  393. 

  394.         make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);

  395. 

  396.         AV_QSORT(vk0 + 1, num_bands_0, int16_t, qsort_comparison_function_int16);

  397.         vdk0_max = vk0[num_bands_0];

  398. 

  399.         vk0[0] = sbr->k[0];

  400.         for (k = 1; k <= num_bands_0; k++) {

  401.             if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)

  402.                 av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);

  403.                 return -1;

  404.             }

  405.             vk0[k] += vk0[k-1];

  406.         }

  407. 

  408.         if (two_regions) {

  409.             int16_t vk1[49];

  410. #if USE_FIXED

  411.             int num_bands_1;

  412. 

  413.             tmp = (sbr->k[2] << 23) / sbr->k[1];

  414.             nz = 0;

  415.             while (tmp < 0x40000000) {

  416.               tmp <<= 1;

  417.               nz++;

  418.             }

  419.             tmp = fixed_log(tmp - 0x80000000);

  420.             tmp = (int)(((int64_t)tmp * CONST_RECIP_LN2 + 0x20000000) >> 30);

  421.             tmp = (((tmp + 0x80) >> 8) + ((8 - nz) << 23)) * half_bands;

  422.             if (spectrum->bs_alter_scale)

  423.                 tmp = (int)(((int64_t)tmp * CONST_076923 + 0x40000000) >> 31);

  424.             num_bands_1 = ((tmp + 0x400000) >> 23) * 2;

  425. #else

  426.             float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f

  427.                                                      : 1.0f; // bs_alter_scale = {0,1}

  428.             int num_bands_1 = lrintf(half_bands * invwarp *

  429.                                      log2f(sbr->k[2] / (float)sbr->k[1])) * 2;

  430. #endif /* USE_FIXED */

  431.             make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);

  432. 

  433.             vdk1_min = array_min_int16(vk1 + 1, num_bands_1);

  434. 

  435.             if (vdk1_min < vdk0_max) {

  436.                 int change;

  437.                 AV_QSORT(vk1 + 1, num_bands_1, int16_t, qsort_comparison_function_int16);

  438.                 change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);

  439.                 vk1[1]           += change;

  440.                 vk1[num_bands_1] -= change;

  441.             }

  442. 

  443.             AV_QSORT(vk1 + 1, num_bands_1, int16_t, qsort_comparison_function_int16);

  444. 

  445.             vk1[0] = sbr->k[1];

  446.             for (k = 1; k <= num_bands_1; k++) {

  447.                 if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)

  448.                     av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);

  449.                     return -1;

  450.                 }

  451.                 vk1[k] += vk1[k-1];

  452.             }

  453. 

  454.             sbr->n_master = num_bands_0 + num_bands_1;

  455.             if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))

  456.                 return -1;

  457.             memcpy(&sbr->f_master[0],               vk0,

  458.                    (num_bands_0 + 1) * sizeof(sbr->f_master[0]));

  459.             memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,

  460.                     num_bands_1      * sizeof(sbr->f_master[0]));

  461. 

  462.         } else {

  463.             sbr->n_master = num_bands_0;

  464.             if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))

  465.                 return -1;

  466.             memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));

  467.         }

  468.     }

  469. 

  470.     return 0;

  471. }

  472. 

  473. /// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)

  474. static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)

  475. {

  476.     int i, k, last_k = -1, last_msb = -1, sb = 0;

  477.     int msb = sbr->k[0];

  478.     int usb = sbr->kx[1];

  479.     int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;

  480. 

  481.     sbr->num_patches = 0;

  482. 

  483.     if (goal_sb < sbr->kx[1] + sbr->m[1]) {

  484.         for (k = 0; sbr->f_master[k] < goal_sb; k++) ;

  485.     } else

  486.         k = sbr->n_master;

  487. 

  488.     do {

  489.         int odd = 0;

  490.         if (k == last_k && msb == last_msb) {

  491.             av_log(ac->avctx, AV_LOG_ERROR, "patch construction failed\n");

  492.             return AVERROR_INVALIDDATA;

  493.         }

  494.         last_k = k;

  495.         last_msb = msb;

  496.         for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {

  497.             sb = sbr->f_master[i];

  498.             odd = (sb + sbr->k[0]) & 1;

  499.         }

  500. 

  501.         // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.

  502.         // After this check the final number of patches can still be six which is

  503.         // illegal however the Coding Technologies decoder check stream has a final

  504.         // count of 6 patches

  505.         if (sbr->num_patches > 5) {

  506.             av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);

  507.             return -1;

  508.         }

  509. 

  510.         sbr->patch_num_subbands[sbr->num_patches]  = FFMAX(sb - usb, 0);

  511.         sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];

  512. 

  513.         if (sbr->patch_num_subbands[sbr->num_patches] > 0) {

  514.             usb = sb;

  515.             msb = sb;

  516.             sbr->num_patches++;

  517.         } else

  518.             msb = sbr->kx[1];

  519. 

  520.         if (sbr->f_master[k] - sb < 3)

  521.             k = sbr->n_master;

  522.     } while (sb != sbr->kx[1] + sbr->m[1]);

  523. 

  524.     if (sbr->num_patches > 1 &&

  525.         sbr->patch_num_subbands[sbr->num_patches - 1] < 3)

  526.         sbr->num_patches--;

  527. 

  528.     return 0;

  529. }

  530. 

  531. /// Derived Frequency Band Tables (14496-3 sp04 p197)

  532. static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)

  533. {

  534.     int k, temp;

  535. #if USE_FIXED

  536.     int nz = 0;

  537. #endif /* USE_FIXED */

  538. 

  539.     sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;

  540.     sbr->n[0] = (sbr->n[1] + 1) >> 1;

  541. 

  542.     memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],

  543.            (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));

  544.     sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];

  545.     sbr->kx[1] = sbr->f_tablehigh[0];

  546. 

  547.     // Requirements (14496-3 sp04 p205)

  548.     if (sbr->kx[1] + sbr->m[1] > 64) {

  549.         av_log(ac->avctx, AV_LOG_ERROR,

  550.                "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);

  551.         return -1;

  552.     }

  553.     if (sbr->kx[1] > 32) {

  554.         av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);

  555.         return -1;

  556.     }

  557. 

  558.     sbr->f_tablelow[0] = sbr->f_tablehigh[0];

  559.     temp = sbr->n[1] & 1;

  560.     for (k = 1; k <= sbr->n[0]; k++)

  561.         sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];

  562. #if USE_FIXED

  563.     temp = (sbr->k[2] << 23) / sbr->kx[1];

  564.     while (temp < 0x40000000) {

  565.         temp <<= 1;

  566.         nz++;

  567.     }

  568.     temp = fixed_log(temp - 0x80000000);

  569.     temp = (int)(((int64_t)temp * CONST_RECIP_LN2 + 0x20000000) >> 30);

  570.     temp = (((temp + 0x80) >> 8) + ((8 - nz) << 23)) * sbr->spectrum_params.bs_noise_bands;

  571. 

  572.     sbr->n_q = (temp + 0x400000) >> 23;

  573.     if (sbr->n_q < 1)

  574.         sbr->n_q = 1;

  575. #else

  576.     sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *

  577.                                log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3

  578. #endif /* USE_FIXED */

  579. 

  580.     if (sbr->n_q > 5) {

  581.         av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);

  582.         return -1;

  583.     }

  584. 

  585.     sbr->f_tablenoise[0] = sbr->f_tablelow[0];

  586.     temp = 0;

  587.     for (k = 1; k <= sbr->n_q; k++) {

  588.         temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);

  589.         sbr->f_tablenoise[k] = sbr->f_tablelow[temp];

  590.     }

  591. 

  592.     if (sbr_hf_calc_npatches(ac, sbr) < 0)

  593.         return -1;

  594. 

  595.     sbr_make_f_tablelim(sbr);

  596. 

  597.     sbr->data[0].f_indexnoise = 0;

  598.     sbr->data[1].f_indexnoise = 0;

  599. 

  600.     return 0;

  601. }

  602. 

  603. static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,

  604.                                               int elements)

  605. {

  606.     int i;

  607.     for (i = 0; i < elements; i++) {

  608.         vec[i] = get_bits1(gb);

  609.     }

  610. }

  611. 

  612. /** ceil(log2(index+1)) */

  613. static const int8_t ceil_log2[] = {

  614.     0, 1, 2, 2, 3, 3,

  615. };

  616. 

  617. static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,

  618.                          GetBitContext *gb, SBRData *ch_data)

  619. {

  620.     int i;

  621.     int bs_pointer = 0;

  622.     // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots

  623.     int abs_bord_trail = 16;

  624.     int num_rel_lead, num_rel_trail;

  625.     unsigned bs_num_env_old = ch_data->bs_num_env;

  626. 

  627.     ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];

  628.     ch_data->bs_amp_res = sbr->bs_amp_res_header;

  629.     ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];

  630. 

  631.     switch (ch_data->bs_frame_class = get_bits(gb, 2)) {

  632.     case FIXFIX:

  633.         ch_data->bs_num_env                 = 1 << get_bits(gb, 2);

  634.         num_rel_lead                        = ch_data->bs_num_env - 1;

  635.         if (ch_data->bs_num_env == 1)

  636.             ch_data->bs_amp_res = 0;

  637. 

  638.         if (ch_data->bs_num_env > 4) {

  639.             av_log(ac->avctx, AV_LOG_ERROR,

  640.                    "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",

  641.                    ch_data->bs_num_env);

  642.             return -1;

  643.         }

  644. 

  645.         ch_data->t_env[0]                   = 0;

  646.         ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

  647. 

  648.         abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /

  649.                    ch_data->bs_num_env;

  650.         for (i = 0; i < num_rel_lead; i++)

  651.             ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;

  652. 

  653.         ch_data->bs_freq_res[1] = get_bits1(gb);

  654.         for (i = 1; i < ch_data->bs_num_env; i++)

  655.             ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];

  656.         break;

  657.     case FIXVAR:

  658.         abs_bord_trail                     += get_bits(gb, 2);

  659.         num_rel_trail                       = get_bits(gb, 2);

  660.         ch_data->bs_num_env                 = num_rel_trail + 1;

  661.         ch_data->t_env[0]                   = 0;

  662.         ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

  663. 

  664.         for (i = 0; i < num_rel_trail; i++)

  665.             ch_data->t_env[ch_data->bs_num_env - 1 - i] =

  666.                 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;

  667. 

  668.         bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);

  669. 

  670.         for (i = 0; i < ch_data->bs_num_env; i++)

  671.             ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);

  672.         break;

  673.     case VARFIX:

  674.         ch_data->t_env[0]                   = get_bits(gb, 2);

  675.         num_rel_lead                        = get_bits(gb, 2);

  676.         ch_data->bs_num_env                 = num_rel_lead + 1;

  677.         ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

  678. 

  679.         for (i = 0; i < num_rel_lead; i++)

  680.             ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;

  681. 

  682.         bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);

  683. 

  684.         get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);

  685.         break;

  686.     case VARVAR:

  687.         ch_data->t_env[0]                   = get_bits(gb, 2);

  688.         abs_bord_trail                     += get_bits(gb, 2);

  689.         num_rel_lead                        = get_bits(gb, 2);

  690.         num_rel_trail                       = get_bits(gb, 2);

  691.         ch_data->bs_num_env                 = num_rel_lead + num_rel_trail + 1;

  692. 

  693.         if (ch_data->bs_num_env > 5) {

  694.             av_log(ac->avctx, AV_LOG_ERROR,

  695.                    "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",

  696.                    ch_data->bs_num_env);

  697.             return -1;

  698.         }

  699. 

  700.         ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;

  701. 

  702.         for (i = 0; i < num_rel_lead; i++)

  703.             ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;

  704.         for (i = 0; i < num_rel_trail; i++)

  705.             ch_data->t_env[ch_data->bs_num_env - 1 - i] =

  706.                 ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;

  707. 

  708.         bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);

  709. 

  710.         get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);

  711.         break;

  712.     }

  713. 

  714.     av_assert0(bs_pointer >= 0);

  715.     if (bs_pointer > ch_data->bs_num_env + 1) {

  716.         av_log(ac->avctx, AV_LOG_ERROR,

  717.                "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",

  718.                bs_pointer);

  719.         return -1;

  720.     }

  721. 

  722.     for (i = 1; i <= ch_data->bs_num_env; i++) {

  723.         if (ch_data->t_env[i-1] >= ch_data->t_env[i]) {

  724.             av_log(ac->avctx, AV_LOG_ERROR, "Not strictly monotone time borders\n");

  725.             return -1;

  726.         }

  727.     }

  728. 

  729.     ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;

  730. 

  731.     ch_data->t_q[0]                     = ch_data->t_env[0];

  732.     ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];

  733.     if (ch_data->bs_num_noise > 1) {

  734.         int idx;

  735.         if (ch_data->bs_frame_class == FIXFIX) {

  736.             idx = ch_data->bs_num_env >> 1;

  737.         } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR

  738.             idx = ch_data->bs_num_env - FFMAX(bs_pointer - 1, 1);

  739.         } else { // VARFIX

  740.             if (!bs_pointer)

  741.                 idx = 1;

  742.             else if (bs_pointer == 1)

  743.                 idx = ch_data->bs_num_env - 1;

  744.             else // bs_pointer > 1

  745.                 idx = bs_pointer - 1;

  746.         }

  747.         ch_data->t_q[1] = ch_data->t_env[idx];

  748.     }

  749. 

  750.     ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev

  751.     ch_data->e_a[1] = -1;

  752.     if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0

  753.         ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;

  754.     } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1

  755.         ch_data->e_a[1] = bs_pointer - 1;

  756. 

  757.     return 0;

  758. }

  759. 

  760. static void copy_sbr_grid(SBRData *dst, const SBRData *src) {

  761.     //These variables are saved from the previous frame rather than copied

  762.     dst->bs_freq_res[0]    = dst->bs_freq_res[dst->bs_num_env];

  763.     dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];

  764.     dst->e_a[0]            = -(dst->e_a[1] != dst->bs_num_env);

  765. 

  766.     //These variables are read from the bitstream and therefore copied

  767.     memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));

  768.     memcpy(dst->t_env,         src->t_env,         sizeof(dst->t_env));

  769.     memcpy(dst->t_q,           src->t_q,           sizeof(dst->t_q));

  770.     dst->bs_num_env        = src->bs_num_env;

  771.     dst->bs_amp_res        = src->bs_amp_res;

  772.     dst->bs_num_noise      = src->bs_num_noise;

  773.     dst->bs_frame_class    = src->bs_frame_class;

  774.     dst->e_a[1]            = src->e_a[1];

  775. }

  776. 

  777. /// Read how the envelope and noise floor data is delta coded

  778. static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,

  779.                           SBRData *ch_data)

  780. {

  781.     get_bits1_vector(gb, ch_data->bs_df_env,   ch_data->bs_num_env);

  782.     get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);

  783. }

  784. 

  785. /// Read inverse filtering data

  786. static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,

  787.                           SBRData *ch_data)

  788. {

  789.     int i;

  790. 

  791.     memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));

  792.     for (i = 0; i < sbr->n_q; i++)

  793.         ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);

  794. }

  795. 

  796. static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,

  797.                               SBRData *ch_data, int ch)

  798. {

  799.     int bits;

  800.     int i, j, k;

  801.     VLC_TYPE (*t_huff)[2], (*f_huff)[2];

  802.     int t_lav, f_lav;

  803.     const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;

  804.     const int odd = sbr->n[1] & 1;

  805. 

  806.     if (sbr->bs_coupling && ch) {

  807.         if (ch_data->bs_amp_res) {

  808.             bits   = 5;

  809.             t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;

  810.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];

  811.             f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

  812.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

  813.         } else {

  814.             bits   = 6;

  815.             t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;

  816.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];

  817.             f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;

  818.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];

  819.         }

  820.     } else {

  821.         if (ch_data->bs_amp_res) {

  822.             bits   = 6;

  823.             t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;

  824.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];

  825.             f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

  826.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

  827.         } else {

  828.             bits   = 7;

  829.             t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;

  830.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];

  831.             f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;

  832.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];

  833.         }

  834.     }

  835. 

  836. #if USE_FIXED

  837.     for (i = 0; i < ch_data->bs_num_env; i++) {

  838.         if (ch_data->bs_df_env[i]) {

  839.             // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame

  840.             if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {

  841.                 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)

  842.                     ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i][j].mant + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

  843.             } else if (ch_data->bs_freq_res[i + 1]) {

  844.                 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {

  845.                     k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]

  846.                     ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i][k].mant + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

  847.                 }

  848.             } else {

  849.                 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {

  850.                     k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]

  851.                     ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i][k].mant + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

  852.                 }

  853.             }

  854.         } else {

  855.             ch_data->env_facs[i + 1][0].mant = delta * get_bits(gb, bits); // bs_env_start_value_balance

  856.             for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)

  857.                 ch_data->env_facs[i + 1][j].mant = ch_data->env_facs[i + 1][j - 1].mant + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);

  858.         }

  859.     }

  860. #else

  861.     for (i = 0; i < ch_data->bs_num_env; i++) {

  862.         if (ch_data->bs_df_env[i]) {

  863.             // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame

  864.             if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {

  865.                 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)

  866.                     ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

  867.             } else if (ch_data->bs_freq_res[i + 1]) {

  868.                 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {

  869.                     k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]

  870.                     ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

  871.                 }

  872.             } else {

  873.                 for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {

  874.                     k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]

  875.                     ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);

  876.                 }

  877.             }

  878.         } else {

  879.             ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance

  880.             for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)

  881.                 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);

  882.         }

  883.     }

  884. #endif /* USE_FIXED */

  885. 

  886.     //assign 0th elements of env_facs from last elements

  887.     memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],

  888.            sizeof(ch_data->env_facs[0]));

  889. }

  890. 

  891. static int read_sbr_noise(AACContext *ac, SpectralBandReplication *sbr, GetBitContext *gb,

  892.                            SBRData *ch_data, int ch)

  893. {

  894.     int i, j;

  895.     VLC_TYPE (*t_huff)[2], (*f_huff)[2];

  896.     int t_lav, f_lav;

  897.     int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;

  898. 

  899.     if (sbr->bs_coupling && ch) {

  900.         t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;

  901.         t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];

  902.         f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

  903.         f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

  904.     } else {

  905.         t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;

  906.         t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];

  907.         f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

  908.         f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

  909.     }

  910. 

  911.     for (i = 0; i < ch_data->bs_num_noise; i++) {

  912.         if (ch_data->bs_df_noise[i]) {

  913.             for (j = 0; j < sbr->n_q; j++) {

  914.                 ch_data->noise_facs_q[i + 1][j] = ch_data->noise_facs_q[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);

  915.                 if (ch_data->noise_facs_q[i + 1][j] > 30U) {

  916.                     av_log(ac->avctx, AV_LOG_ERROR, "noise_facs_q %d is invalid\n", ch_data->noise_facs_q[i + 1][j]);

  917.                     return AVERROR_INVALIDDATA;

  918.                 }

  919.             }

  920.         } else {

  921.             ch_data->noise_facs_q[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level

  922.             for (j = 1; j < sbr->n_q; j++) {

  923.                 ch_data->noise_facs_q[i + 1][j] = ch_data->noise_facs_q[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);

  924.                 if (ch_data->noise_facs_q[i + 1][j] > 30U) {

  925.                     av_log(ac->avctx, AV_LOG_ERROR, "noise_facs_q %d is invalid\n", ch_data->noise_facs_q[i + 1][j]);

  926.                     return AVERROR_INVALIDDATA;

  927.                 }

  928.             }

  929.         }

  930.     }

  931. 

  932.     //assign 0th elements of noise_facs_q from last elements

  933.     memcpy(ch_data->noise_facs_q[0], ch_data->noise_facs_q[ch_data->bs_num_noise],

  934.            sizeof(ch_data->noise_facs_q[0]));

  935.     return 0;

  936. }

  937. 

  938. static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,

  939.                                GetBitContext *gb,

  940.                                int bs_extension_id, int *num_bits_left)

  941. {

  942.     switch (bs_extension_id) {

  943.     case EXTENSION_ID_PS:

  944.         if (!ac->oc[1].m4ac.ps) {

  945.             av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");

  946.             skip_bits_long(gb, *num_bits_left); // bs_fill_bits

  947.             *num_bits_left = 0;

  948.         } else {

  949. #if 1

  950.             *num_bits_left -= AAC_RENAME(ff_ps_read_data)(ac->avctx, gb, &sbr->ps, *num_bits_left);

  951.             ac->avctx->profile = FF_PROFILE_AAC_HE_V2;

  952. #else

  953.             avpriv_report_missing_feature(ac->avctx, "Parametric Stereo");

  954.             skip_bits_long(gb, *num_bits_left); // bs_fill_bits

  955.             *num_bits_left = 0;

  956. #endif

  957.         }

  958.         break;

  959.     default:

  960.         // some files contain 0-padding

  961.         if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))

  962.             avpriv_request_sample(ac->avctx, "Reserved SBR extensions");

  963.         skip_bits_long(gb, *num_bits_left); // bs_fill_bits

  964.         *num_bits_left = 0;

  965.         break;

  966.     }

  967. }

  968. 

  969. static int read_sbr_single_channel_element(AACContext *ac,

  970.                                             SpectralBandReplication *sbr,

  971.                                             GetBitContext *gb)

  972. {

  973.     int ret;

  974. 

  975.     if (get_bits1(gb)) // bs_data_extra

  976.         skip_bits(gb, 4); // bs_reserved

  977. 

  978.     if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))

  979.         return -1;

  980.     read_sbr_dtdf(sbr, gb, &sbr->data[0]);

  981.     read_sbr_invf(sbr, gb, &sbr->data[0]);

  982.     read_sbr_envelope(sbr, gb, &sbr->data[0], 0);

  983.     if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)

  984.         return ret;

  985. 

  986.     if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))

  987.         get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);

  988. 

  989.     return 0;

  990. }

  991. 

  992. static int read_sbr_channel_pair_element(AACContext *ac,

  993.                                           SpectralBandReplication *sbr,

  994.                                           GetBitContext *gb)

  995. {

  996.     int ret;

  997. 

  998.     if (get_bits1(gb))    // bs_data_extra

  999.         skip_bits(gb, 8); // bs_reserved

  1000. 

  1001.     if ((sbr->bs_coupling = get_bits1(gb))) {

  1002.         if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))

  1003.             return -1;

  1004.         copy_sbr_grid(&sbr->data[1], &sbr->data[0]);

  1005.         read_sbr_dtdf(sbr, gb, &sbr->data[0]);

  1006.         read_sbr_dtdf(sbr, gb, &sbr->data[1]);

  1007.         read_sbr_invf(sbr, gb, &sbr->data[0]);

  1008.         memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));

  1009.         memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));

  1010.         read_sbr_envelope(sbr, gb, &sbr->data[0], 0);

  1011.         if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)

  1012.             return ret;

  1013.         read_sbr_envelope(sbr, gb, &sbr->data[1], 1);

  1014.         if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0)

  1015.             return ret;

  1016.     } else {

  1017.         if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||

  1018.             read_sbr_grid(ac, sbr, gb, &sbr->data[1]))

  1019.             return -1;

  1020.         read_sbr_dtdf(sbr, gb, &sbr->data[0]);

  1021.         read_sbr_dtdf(sbr, gb, &sbr->data[1]);

  1022.         read_sbr_invf(sbr, gb, &sbr->data[0]);

  1023.         read_sbr_invf(sbr, gb, &sbr->data[1]);

  1024.         read_sbr_envelope(sbr, gb, &sbr->data[0], 0);

  1025.         read_sbr_envelope(sbr, gb, &sbr->data[1], 1);

  1026.         if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[0], 0)) < 0)

  1027.             return ret;

  1028.         if((ret = read_sbr_noise(ac, sbr, gb, &sbr->data[1], 1)) < 0)

  1029.             return ret;

  1030.     }

  1031. 

  1032.     if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))

  1033.         get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);

  1034.     if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))

  1035.         get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);

  1036. 

  1037.     return 0;

  1038. }

  1039. 

  1040. static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,

  1041.                                   GetBitContext *gb, int id_aac)

  1042. {

  1043.     unsigned int cnt = get_bits_count(gb);

  1044. 

  1045.     sbr->id_aac = id_aac;

  1046.     sbr->ready_for_dequant = 1;

  1047. 

  1048.     if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {

  1049.         if (read_sbr_single_channel_element(ac, sbr, gb)) {

  1050.             sbr_turnoff(sbr);

  1051.             return get_bits_count(gb) - cnt;

  1052.         }

  1053.     } else if (id_aac == TYPE_CPE) {

  1054.         if (read_sbr_channel_pair_element(ac, sbr, gb)) {

  1055.             sbr_turnoff(sbr);

  1056.             return get_bits_count(gb) - cnt;

  1057.         }

  1058.     } else {

  1059.         av_log(ac->avctx, AV_LOG_ERROR,

  1060.             "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);

  1061.         sbr_turnoff(sbr);

  1062.         return get_bits_count(gb) - cnt;

  1063.     }

  1064.     if (get_bits1(gb)) { // bs_extended_data

  1065.         int num_bits_left = get_bits(gb, 4); // bs_extension_size

  1066.         if (num_bits_left == 15)

  1067.             num_bits_left += get_bits(gb, 8); // bs_esc_count

  1068. 

  1069.         num_bits_left <<= 3;

  1070.         while (num_bits_left > 7) {

  1071.             num_bits_left -= 2;

  1072.             read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id

  1073.         }

  1074.         if (num_bits_left < 0) {

  1075.             av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");

  1076.         }

  1077.         if (num_bits_left > 0)

  1078.             skip_bits(gb, num_bits_left);

  1079.     }

  1080. 

  1081.     return get_bits_count(gb) - cnt;

  1082. }

  1083. 

  1084. static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)

  1085. {

  1086.     int err;

  1087.     err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);

  1088.     if (err >= 0)

  1089.         err = sbr_make_f_derived(ac, sbr);

  1090.     if (err < 0) {

  1091.         av_log(ac->avctx, AV_LOG_ERROR,

  1092.                "SBR reset failed. Switching SBR to pure upsampling mode.\n");

  1093.         sbr_turnoff(sbr);

  1094.     }

  1095. }

  1096. 

  1097. /**

  1098.  * Decode Spectral Band Replication extension data; reference: table 4.55.

  1099.  *

  1100.  * @param   crc flag indicating the presence of CRC checksum

  1101.  * @param   cnt length of TYPE_FIL syntactic element in bytes

  1102.  *

  1103.  * @return  Returns number of bytes consumed from the TYPE_FIL element.

  1104.  */

  1105. int AAC_RENAME(ff_decode_sbr_extension)(AACContext *ac, SpectralBandReplication *sbr,

  1106.                             GetBitContext *gb_host, int crc, int cnt, int id_aac)

  1107. {

  1108.     unsigned int num_sbr_bits = 0, num_align_bits;

  1109.     unsigned bytes_read;

  1110.     GetBitContext gbc = *gb_host, *gb = &gbc;

  1111.     skip_bits_long(gb_host, cnt*8 - 4);

  1112. 

  1113.     sbr->reset = 0;

  1114. 

  1115.     if (!sbr->sample_rate)

  1116.         sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support

  1117.     if (!ac->oc[1].m4ac.ext_sample_rate)

  1118.         ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;

  1119. 

  1120.     if (crc) {

  1121.         skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check

  1122.         num_sbr_bits += 10;

  1123.     }

  1124. 

  1125.     //Save some state from the previous frame.

  1126.     sbr->kx[0] = sbr->kx[1];

  1127.     sbr->m[0] = sbr->m[1];

  1128.     sbr->kx_and_m_pushed = 1;

  1129. 

  1130.     num_sbr_bits++;

  1131.     if (get_bits1(gb)) // bs_header_flag

  1132.         num_sbr_bits += read_sbr_header(sbr, gb);

  1133. 

  1134.     if (sbr->reset)

  1135.         sbr_reset(ac, sbr);

  1136. 

  1137.     if (sbr->start)

  1138.         num_sbr_bits  += read_sbr_data(ac, sbr, gb, id_aac);

  1139. 

  1140.     num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;

  1141.     bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);

  1142. 

  1143.     if (bytes_read > cnt) {

  1144.         av_log(ac->avctx, AV_LOG_ERROR,

  1145.                "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);

  1146.     }

  1147.     return cnt;

  1148. }

  1149. 

  1150. /**

  1151.  * Analysis QMF Bank (14496-3 sp04 p206)

  1152.  *

  1153.  * @param   x       pointer to the beginning of the first sample window

  1154.  * @param   W       array of complex-valued samples split into subbands

  1155.  */

  1156. #ifndef sbr_qmf_analysis

  1157. #if USE_FIXED

  1158. static void sbr_qmf_analysis(AVFixedDSPContext *dsp, FFTContext *mdct,

  1159. #else

  1160. static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,

  1161. #endif /* USE_FIXED */

  1162.                              SBRDSPContext *sbrdsp, const INTFLOAT *in, INTFLOAT *x,

  1163.                              INTFLOAT z[320], INTFLOAT W[2][32][32][2], int buf_idx)

  1164. {

  1165.     int i;

  1166. #if USE_FIXED

  1167.     int j;

  1168. #endif

  1169.     memcpy(x    , x+1024, (320-32)*sizeof(x[0]));

  1170.     memcpy(x+288, in,         1024*sizeof(x[0]));

  1171.     for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames

  1172.                                // are not supported

  1173.         dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);

  1174.         sbrdsp->sum64x5(z);

  1175.         sbrdsp->qmf_pre_shuffle(z);

  1176. #if USE_FIXED

  1177.         for (j = 64; j < 128; j++) {

  1178.             if (z[j] > 1<<24) {

  1179.                 av_log(NULL, AV_LOG_WARNING,

  1180.                        "sbr_qmf_analysis: value %09d too large, setting to %09d\n",

  1181.                        z[j], 1<<24);

  1182.                 z[j] = 1<<24;

  1183.             } else if (z[j] < -(1<<24)) {

  1184.                 av_log(NULL, AV_LOG_WARNING,

  1185.                        "sbr_qmf_analysis: value %09d too small, setting to %09d\n",

  1186.                        z[j], -(1<<24));

  1187.                 z[j] = -(1<<24);

  1188.             }

  1189.         }

  1190. #endif

  1191.         mdct->imdct_half(mdct, z, z+64);

  1192.         sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);

  1193.         x += 32;

  1194.     }

  1195. }

  1196. #endif

  1197. 

  1198. /**

  1199.  * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank

  1200.  * (14496-3 sp04 p206)

  1201.  */

  1202. #ifndef sbr_qmf_synthesis

  1203. static void sbr_qmf_synthesis(FFTContext *mdct,

  1204. #if USE_FIXED

  1205.                               SBRDSPContext *sbrdsp, AVFixedDSPContext *dsp,

  1206. #else

  1207.                               SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,

  1208. #endif /* USE_FIXED */

  1209.                               INTFLOAT *out, INTFLOAT X[2][38][64],

  1210.                               INTFLOAT mdct_buf[2][64],

  1211.                               INTFLOAT *v0, int *v_off, const unsigned int div)

  1212. {

  1213.     int i, n;

  1214.     const INTFLOAT *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;

  1215.     const int step = 128 >> div;

  1216.     INTFLOAT *v;

  1217.     for (i = 0; i < 32; i++) {

  1218.         if (*v_off < step) {

  1219.             int saved_samples = (1280 - 128) >> div;

  1220.             memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(INTFLOAT));

  1221.             *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;

  1222.         } else {

  1223.             *v_off -= step;

  1224.         }

  1225.         v = v0 + *v_off;

  1226.         if (div) {

  1227.             for (n = 0; n < 32; n++) {

  1228.                 X[0][i][   n] = -X[0][i][n];

  1229.                 X[0][i][32+n] =  X[1][i][31-n];

  1230.             }

  1231.             mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

  1232.             sbrdsp->qmf_deint_neg(v, mdct_buf[0]);

  1233.         } else {

  1234.             sbrdsp->neg_odd_64(X[1][i]);

  1235.             mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

  1236.             mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);

  1237.             sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);

  1238.         }

  1239.         dsp->vector_fmul    (out, v                , sbr_qmf_window                       , 64 >> div);

  1240.         dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out   , 64 >> div);

  1241.         dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out   , 64 >> div);

  1242.         dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out   , 64 >> div);

  1243.         dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out   , 64 >> div);

  1244.         dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out   , 64 >> div);

  1245.         dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out   , 64 >> div);

  1246.         dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out   , 64 >> div);

  1247.         dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out   , 64 >> div);

  1248.         dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out   , 64 >> div);

  1249.         out += 64 >> div;

  1250.     }

  1251. }

  1252. #endif

  1253. 

  1254. /// Generate the subband filtered lowband

  1255. static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,

  1256.                       INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2],

  1257.                       int buf_idx)

  1258. {

  1259.     int i, k;

  1260.     const int t_HFGen = 8;

  1261.     const int i_f = 32;

  1262.     memset(X_low, 0, 32*sizeof(*X_low));

  1263.     for (k = 0; k < sbr->kx[1]; k++) {

  1264.         for (i = t_HFGen; i < i_f + t_HFGen; i++) {

  1265.             X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];

  1266.             X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];

  1267.         }

  1268.     }

  1269.     buf_idx = 1-buf_idx;

  1270.     for (k = 0; k < sbr->kx[0]; k++) {

  1271.         for (i = 0; i < t_HFGen; i++) {

  1272.             X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];

  1273.             X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];

  1274.         }

  1275.     }

  1276.     return 0;

  1277. }

  1278. 

  1279. /// High Frequency Generator (14496-3 sp04 p215)

  1280. static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,

  1281.                       INTFLOAT X_high[64][40][2], const INTFLOAT X_low[32][40][2],

  1282.                       const INTFLOAT (*alpha0)[2], const INTFLOAT (*alpha1)[2],

  1283.                       const INTFLOAT bw_array[5], const uint8_t *t_env,

  1284.                       int bs_num_env)

  1285. {

  1286.     int j, x;

  1287.     int g = 0;

  1288.     int k = sbr->kx[1];

  1289.     for (j = 0; j < sbr->num_patches; j++) {

  1290.         for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {

  1291.             const int p = sbr->patch_start_subband[j] + x;

  1292.             while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])

  1293.                 g++;

  1294.             g--;

  1295. 

  1296.             if (g < 0) {

  1297.                 av_log(ac->avctx, AV_LOG_ERROR,

  1298.                        "ERROR : no subband found for frequency %d\n", k);

  1299.                 return -1;

  1300.             }

  1301. 

  1302.             sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,

  1303.                             X_low[p]  + ENVELOPE_ADJUSTMENT_OFFSET,

  1304.                             alpha0[p], alpha1[p], bw_array[g],

  1305.                             2 * t_env[0], 2 * t_env[bs_num_env]);

  1306.         }

  1307.     }

  1308.     if (k < sbr->m[1] + sbr->kx[1])

  1309.         memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));

  1310. 

  1311.     return 0;

  1312. }

  1313. 

  1314. /// Generate the subband filtered lowband

  1315. static int sbr_x_gen(SpectralBandReplication *sbr, INTFLOAT X[2][38][64],

  1316.                      const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2],

  1317.                      const INTFLOAT X_low[32][40][2], int ch)

  1318. {

  1319.     int k, i;

  1320.     const int i_f = 32;

  1321.     const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);

  1322.     memset(X, 0, 2*sizeof(*X));

  1323.     for (k = 0; k < sbr->kx[0]; k++) {

  1324.         for (i = 0; i < i_Temp; i++) {

  1325.             X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

  1326.             X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

  1327.         }

  1328.     }

  1329.     for (; k < sbr->kx[0] + sbr->m[0]; k++) {

  1330.         for (i = 0; i < i_Temp; i++) {

  1331.             X[0][i][k] = Y0[i + i_f][k][0];

  1332.             X[1][i][k] = Y0[i + i_f][k][1];

  1333.         }

  1334.     }

  1335. 

  1336.     for (k = 0; k < sbr->kx[1]; k++) {

  1337.         for (i = i_Temp; i < 38; i++) {

  1338.             X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

  1339.             X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

  1340.         }

  1341.     }

  1342.     for (; k < sbr->kx[1] + sbr->m[1]; k++) {

  1343.         for (i = i_Temp; i < i_f; i++) {

  1344.             X[0][i][k] = Y1[i][k][0];

  1345.             X[1][i][k] = Y1[i][k][1];

  1346.         }

  1347.     }

  1348.     return 0;

  1349. }

  1350. 

  1351. /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping

  1352.  * (14496-3 sp04 p217)

  1353.  */

  1354. static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,

  1355.                         SBRData *ch_data, int e_a[2])

  1356. {

  1357.     int e, i, m;

  1358. 

  1359.     memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));

  1360.     for (e = 0; e < ch_data->bs_num_env; e++) {

  1361.         const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];

  1362.         uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

  1363.         int k;

  1364. 

  1365.         if (sbr->kx[1] != table[0]) {

  1366.             av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "

  1367.                    "Derived frequency tables were not regenerated.\n");

  1368.             sbr_turnoff(sbr);

  1369.             return AVERROR_BUG;

  1370.         }

  1371.         for (i = 0; i < ilim; i++)

  1372.             for (m = table[i]; m < table[i + 1]; m++)

  1373.                 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];

  1374. 

  1375.         // ch_data->bs_num_noise > 1 => 2 noise floors

  1376.         k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);

  1377.         for (i = 0; i < sbr->n_q; i++)

  1378.             for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)

  1379.                 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];

  1380. 

  1381.         for (i = 0; i < sbr->n[1]; i++) {

  1382.             if (ch_data->bs_add_harmonic_flag) {

  1383.                 const unsigned int m_midpoint =

  1384.                     (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;

  1385. 

  1386.                 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *

  1387.                     (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));

  1388.             }

  1389.         }

  1390. 

  1391.         for (i = 0; i < ilim; i++) {

  1392.             int additional_sinusoid_present = 0;

  1393.             for (m = table[i]; m < table[i + 1]; m++) {

  1394.                 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {

  1395.                     additional_sinusoid_present = 1;

  1396.                     break;

  1397.                 }

  1398.             }

  1399.             memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,

  1400.                    (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));

  1401.         }

  1402.     }

  1403. 

  1404.     memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));

  1405.     return 0;

  1406. }

  1407. 

  1408. /// Estimation of current envelope (14496-3 sp04 p218)

  1409. static void sbr_env_estimate(AAC_FLOAT (*e_curr)[48], INTFLOAT X_high[64][40][2],

  1410.                              SpectralBandReplication *sbr, SBRData *ch_data)

  1411. {

  1412.     int e, m;

  1413.     int kx1 = sbr->kx[1];

  1414. 

  1415.     if (sbr->bs_interpol_freq) {

  1416.         for (e = 0; e < ch_data->bs_num_env; e++) {

  1417. #if USE_FIXED

  1418.             const SoftFloat recip_env_size = av_int2sf(0x20000000 / (ch_data->t_env[e + 1] - ch_data->t_env[e]), 30);

  1419. #else

  1420.             const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);

  1421. #endif /* USE_FIXED */

  1422.             int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1423.             int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1424. 

  1425.             for (m = 0; m < sbr->m[1]; m++) {

  1426.                 AAC_FLOAT sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);

  1427. #if USE_FIXED

  1428.                 e_curr[e][m] = av_mul_sf(sum, recip_env_size);

  1429. #else

  1430.                 e_curr[e][m] = sum * recip_env_size;

  1431. #endif /* USE_FIXED */

  1432.             }

  1433.         }

  1434.     } else {

  1435.         int k, p;

  1436. 

  1437.         for (e = 0; e < ch_data->bs_num_env; e++) {

  1438.             const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);

  1439.             int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1440.             int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1441.             const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

  1442. 

  1443.             for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {

  1444. #if USE_FIXED

  1445.                 SoftFloat sum = FLOAT_0;

  1446.                 const SoftFloat den = av_int2sf(0x20000000 / (env_size * (table[p + 1] - table[p])), 29);

  1447.                 for (k = table[p]; k < table[p + 1]; k++) {

  1448.                     sum = av_add_sf(sum, sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb));

  1449.                 }

  1450.                 sum = av_mul_sf(sum, den);

  1451. #else

  1452.                 float sum = 0.0f;

  1453.                 const int den = env_size * (table[p + 1] - table[p]);

  1454. 

  1455.                 for (k = table[p]; k < table[p + 1]; k++) {

  1456.                     sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);

  1457.                 }

  1458.                 sum /= den;

  1459. #endif /* USE_FIXED */

  1460.                 for (k = table[p]; k < table[p + 1]; k++) {

  1461.                     e_curr[e][k - kx1] = sum;

  1462.                 }

  1463.             }

  1464.         }

  1465.     }

  1466. }

  1467. 

  1468. void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac,

  1469.                   INTFLOAT* L, INTFLOAT* R)

  1470. {

  1471.     int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;

  1472.     int ch;

  1473.     int nch = (id_aac == TYPE_CPE) ? 2 : 1;

  1474.     int err;

  1475. 

  1476.     if (id_aac != sbr->id_aac) {

  1477.         av_log(ac->avctx, AV_LOG_ERROR,

  1478.             "element type mismatch %d != %d\n", id_aac, sbr->id_aac);

  1479.         sbr_turnoff(sbr);

  1480.     }

  1481. 

  1482.     if (sbr->start && !sbr->ready_for_dequant) {

  1483.         av_log(ac->avctx, AV_LOG_ERROR,

  1484.                "No quantized data read for sbr_dequant.\n");

  1485.         sbr_turnoff(sbr);

  1486.     }

  1487. 

  1488.     if (!sbr->kx_and_m_pushed) {

  1489.         sbr->kx[0] = sbr->kx[1];

  1490.         sbr->m[0] = sbr->m[1];

  1491.     } else {

  1492.         sbr->kx_and_m_pushed = 0;

  1493.     }

  1494. 

  1495.     if (sbr->start) {

  1496.         sbr_dequant(sbr, id_aac);

  1497.         sbr->ready_for_dequant = 0;

  1498.     }

  1499.     for (ch = 0; ch < nch; ch++) {

  1500.         /* decode channel */

  1501.         sbr_qmf_analysis(ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,

  1502.                          (INTFLOAT*)sbr->qmf_filter_scratch,

  1503.                          sbr->data[ch].W, sbr->data[ch].Ypos);

  1504.         sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low,

  1505.                           (const INTFLOAT (*)[32][32][2]) sbr->data[ch].W,

  1506.                           sbr->data[ch].Ypos);

  1507.         sbr->data[ch].Ypos ^= 1;

  1508.         if (sbr->start) {

  1509.             sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1,

  1510.                                          (const INTFLOAT (*)[40][2]) sbr->X_low, sbr->k[0]);

  1511.             sbr_chirp(sbr, &sbr->data[ch]);

  1512.             av_assert0(sbr->data[ch].bs_num_env > 0);

  1513.             sbr_hf_gen(ac, sbr, sbr->X_high,

  1514.                        (const INTFLOAT (*)[40][2]) sbr->X_low,

  1515.                        (const INTFLOAT (*)[2]) sbr->alpha0,

  1516.                        (const INTFLOAT (*)[2]) sbr->alpha1,

  1517.                        sbr->data[ch].bw_array, sbr->data[ch].t_env,

  1518.                        sbr->data[ch].bs_num_env);

  1519. 

  1520.             // hf_adj

  1521.             err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

  1522.             if (!err) {

  1523.                 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);

  1524.                 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

  1525.                 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],

  1526.                                 (const INTFLOAT (*)[40][2]) sbr->X_high,

  1527.                                 sbr, &sbr->data[ch],

  1528.                                 sbr->data[ch].e_a);

  1529.             }

  1530.         }

  1531. 

  1532.         /* synthesis */

  1533.         sbr->c.sbr_x_gen(sbr, sbr->X[ch],

  1534.                   (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos],

  1535.                   (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[  sbr->data[ch].Ypos],

  1536.                   (const INTFLOAT (*)[40][2]) sbr->X_low, ch);

  1537.     }

  1538. 

  1539.     if (ac->oc[1].m4ac.ps == 1) {

  1540.         if (sbr->ps.start) {

  1541.             AAC_RENAME(ff_ps_apply)(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);

  1542.         } else {

  1543.             memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));

  1544.         }

  1545.         nch = 2;

  1546.     }

  1547. 

  1548.     sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,

  1549.                       L, sbr->X[0], sbr->qmf_filter_scratch,

  1550.                       sbr->data[0].synthesis_filterbank_samples,

  1551.                       &sbr->data[0].synthesis_filterbank_samples_offset,

  1552.                       downsampled);

  1553.     if (nch == 2)

  1554.         sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,

  1555.                           R, sbr->X[1], sbr->qmf_filter_scratch,

  1556.                           sbr->data[1].synthesis_filterbank_samples,

  1557.                           &sbr->data[1].synthesis_filterbank_samples_offset,

  1558.                           downsampled);

  1559. }

  1560. 

  1561. static void aacsbr_func_ptr_init(AACSBRContext *c)

  1562. {

  1563.     c->sbr_lf_gen            = sbr_lf_gen;

  1564.     c->sbr_hf_assemble       = sbr_hf_assemble;

  1565.     c->sbr_x_gen             = sbr_x_gen;

  1566.     c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;

  1567. 

  1568. #if !USE_FIXED

  1569.     if(ARCH_MIPS)

  1570.         ff_aacsbr_func_ptr_init_mips(c);

  1571. #endif

  1572. }