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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.     // Init defults used in pure upsampling mode

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

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

  78.     // Reset values for first SBR header

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

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

  81. }

  82. 

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

  84. {

  85.     if(sbr->mdct.mdct_bits)

  86.         return;

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

  88.     sbr_turnoff(sbr);

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

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

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

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

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

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

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

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

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

  98.     aacsbr_func_ptr_init(&sbr->c);

  99. }

  100. 

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

  102. {

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

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

  105. }

  106. 

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

  108. {

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

  110. }

  111. 

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

  113. {

  114.     int i;

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

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

  117.             return 1;

  118.     return 0;

  119. }

  120. 

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

  122. static void sbr_make_f_tablelim(SpectralBandReplication *sbr)

  123. {

  124.     int k;

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

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

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

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

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

  130.         int16_t patch_borders[7];

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

  132. 

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

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

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

  136. 

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

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

  139.         if (sbr->num_patches > 1)

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

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

  142. 

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

  144.               uint16_t,

  145.               qsort_comparison_function_int16);

  146. 

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

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

  149. #if USE_FIXED

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

  151. #else

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

  153. #endif /* USE_FIXED */

  154.                 *++out = *in++;

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

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

  157.                 in++;

  158.                 sbr->n_lim--;

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

  160.                 *out = *in++;

  161.                 sbr->n_lim--;

  162.             } else {

  163.                 *++out = *in++;

  164.             }

  165.         }

  166.     } else {

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

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

  169.         sbr->n_lim = 1;

  170.     }

  171. }

  172. 

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

  174. {

  175.     unsigned int cnt = get_bits_count(gb);

  176.     uint8_t bs_header_extra_1;

  177.     uint8_t bs_header_extra_2;

  178.     int old_bs_limiter_bands = sbr->bs_limiter_bands;

  179.     SpectrumParameters old_spectrum_params;

  180. 

  181.     sbr->start = 1;

  182. 

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

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

  185. 

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

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

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

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

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

  191. 

  192.     bs_header_extra_1 = get_bits1(gb);

  193.     bs_header_extra_2 = get_bits1(gb);

  194. 

  195.     if (bs_header_extra_1) {

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

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

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

  199.     } else {

  200.         sbr->spectrum_params.bs_freq_scale  = 2;

  201.         sbr->spectrum_params.bs_alter_scale = 1;

  202.         sbr->spectrum_params.bs_noise_bands = 2;

  203.     }

  204. 

  205.     // Check if spectrum parameters changed

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

  207.         sbr->reset = 1;

  208. 

  209.     if (bs_header_extra_2) {

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

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

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

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

  214.     } else {

  215.         sbr->bs_limiter_bands  = 2;

  216.         sbr->bs_limiter_gains  = 2;

  217.         sbr->bs_interpol_freq  = 1;

  218.         sbr->bs_smoothing_mode = 1;

  219.     }

  220. 

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

  222.         sbr_make_f_tablelim(sbr);

  223. 

  224.     return get_bits_count(gb) - cnt;

  225. }

  226. 

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

  228. {

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

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

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

  232.     return min;

  233. }

  234. 

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

  236. {

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

  238.     if (n_master <= 0) {

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

  240.         return -1;

  241.     }

  242.     if (bs_xover_band >= n_master) {

  243.         av_log(avctx, AV_LOG_ERROR,

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

  245.                bs_xover_band);

  246.         return -1;

  247.     }

  248.     return 0;

  249. }

  250. 

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

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

  253.                              SpectrumParameters *spectrum)

  254. {

  255.     unsigned int temp, max_qmf_subbands = 0;

  256.     unsigned int start_min, stop_min;

  257.     int k;

  258.     const int8_t *sbr_offset_ptr;

  259.     int16_t stop_dk[13];

  260. 

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

  262.         temp = 3000;

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

  264.         temp = 4000;

  265.     } else

  266.         temp = 5000;

  267. 

  268.     switch (sbr->sample_rate) {

  269.     case 16000:

  270.         sbr_offset_ptr = sbr_offset[0];

  271.         break;

  272.     case 22050:

  273.         sbr_offset_ptr = sbr_offset[1];

  274.         break;

  275.     case 24000:

  276.         sbr_offset_ptr = sbr_offset[2];

  277.         break;

  278.     case 32000:

  279.         sbr_offset_ptr = sbr_offset[3];

  280.         break;

  281.     case 44100: case 48000: case 64000:

  282.         sbr_offset_ptr = sbr_offset[4];

  283.         break;

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

  285.         sbr_offset_ptr = sbr_offset[5];

  286.         break;

  287.     default:

  288.         av_log(ac->avctx, AV_LOG_ERROR,

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

  290.         return -1;

  291.     }

  292. 

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

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

  295. 

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

  297. 

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

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

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

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

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

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

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

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

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

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

  308.     } else {

  309.         av_log(ac->avctx, AV_LOG_ERROR,

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

  311.         return -1;

  312.     }

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

  314. 

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

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

  317.         max_qmf_subbands = 48;

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

  319.         max_qmf_subbands = 35;

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

  321.         max_qmf_subbands = 32;

  322.     else

  323.         av_assert0(0);

  324. 

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

  326.         av_log(ac->avctx, AV_LOG_ERROR,

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

  328.         return -1;

  329.     }

  330. 

  331.     if (!spectrum->bs_freq_scale) {

  332.         int dk, k2diff;

  333. 

  334.         dk = spectrum->bs_alter_scale + 1;

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

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

  337.             return -1;

  338. 

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

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

  341. 

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

  343.         if (k2diff < 0) {

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

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

  346.         } else if (k2diff) {

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

  348.         }

  349. 

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

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

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

  353. 

  354.     } else {

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

  356.         int two_regions, num_bands_0;

  357.         int vdk0_max, vdk1_min;

  358.         int16_t vk0[49];

  359. #if USE_FIXED

  360.         int tmp, nz = 0;

  361. #endif /* USE_FIXED */

  362. 

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

  364.             two_regions = 1;

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

  366.         } else {

  367.             two_regions = 0;

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

  369.         }

  370. 

  371. #if USE_FIXED

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

  373.         while (tmp < 0x40000000) {

  374.           tmp <<= 1;

  375.           nz++;

  376.         }

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

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

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

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

  381. #else

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

  383. #endif /* USE_FIXED */

  384. 

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

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

  387.             return -1;

  388.         }

  389. 

  390.         vk0[0] = 0;

  391. 

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

  393. 

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

  395.         vdk0_max = vk0[num_bands_0];

  396. 

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

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

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

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

  401.                 return -1;

  402.             }

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

  404.         }

  405. 

  406.         if (two_regions) {

  407.             int16_t vk1[49];

  408. #if USE_FIXED

  409.             int num_bands_1;

  410. 

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

  412.             nz = 0;

  413.             while (tmp < 0x40000000) {

  414.               tmp <<= 1;

  415.               nz++;

  416.             }

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

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

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

  420.             if (spectrum->bs_alter_scale)

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

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

  423. #else

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

  425.                                                      : 1.0f; // bs_alter_scale = {0,1}

  426.             int num_bands_1 = lrintf(half_bands * invwarp *

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

  428. #endif /* USE_FIXED */

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

  430. 

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

  432. 

  433.             if (vdk1_min < vdk0_max) {

  434.                 int change;

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

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

  437.                 vk1[1]           += change;

  438.                 vk1[num_bands_1] -= change;

  439.             }

  440. 

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

  442. 

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

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

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

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

  447.                     return -1;

  448.                 }

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

  450.             }

  451. 

  452.             sbr->n_master = num_bands_0 + num_bands_1;

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

  454.                 return -1;

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

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

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

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

  459. 

  460.         } else {

  461.             sbr->n_master = num_bands_0;

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

  463.                 return -1;

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

  465.         }

  466.     }

  467. 

  468.     return 0;

  469. }

  470. 

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

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

  473. {

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

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

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

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

  478. 

  479.     sbr->num_patches = 0;

  480. 

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

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

  483.     } else

  484.         k = sbr->n_master;

  485. 

  486.     do {

  487.         int odd = 0;

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

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

  490.             return AVERROR_INVALIDDATA;

  491.         }

  492.         last_k = k;

  493.         last_msb = msb;

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

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

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

  497.         }

  498. 

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

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

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

  502.         // count of 6 patches

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

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

  505.             return -1;

  506.         }

  507. 

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

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

  510. 

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

  512.             usb = sb;

  513.             msb = sb;

  514.             sbr->num_patches++;

  515.         } else

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

  517. 

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

  519.             k = sbr->n_master;

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

  521. 

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

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

  524.         sbr->num_patches--;

  525. 

  526.     return 0;

  527. }

  528. 

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

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

  531. {

  532.     int k, temp;

  533. #if USE_FIXED

  534.     int nz = 0;

  535. #endif /* USE_FIXED */

  536. 

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

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

  539. 

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

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

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

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

  544. 

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

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

  547.         av_log(ac->avctx, AV_LOG_ERROR,

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

  549.         return -1;

  550.     }

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

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

  553.         return -1;

  554.     }

  555. 

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

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

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

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

  560. #if USE_FIXED

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

  562.     while (temp < 0x40000000) {

  563.         temp <<= 1;

  564.         nz++;

  565.     }

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

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

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

  569. 

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

  571.     if (sbr->n_q < 1)

  572.         sbr->n_q = 1;

  573. #else

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

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

  576. #endif /* USE_FIXED */

  577. 

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

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

  580.         return -1;

  581.     }

  582. 

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

  584.     temp = 0;

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

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

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

  588.     }

  589. 

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

  591.         return -1;

  592. 

  593.     sbr_make_f_tablelim(sbr);

  594. 

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

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

  597. 

  598.     return 0;

  599. }

  600. 

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

  602.                                               int elements)

  603. {

  604.     int i;

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

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

  607.     }

  608. }

  609. 

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

  611. static const int8_t ceil_log2[] = {

  612.     0, 1, 2, 2, 3, 3,

  613. };

  614. 

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

  616.                          GetBitContext *gb, SBRData *ch_data)

  617. {

  618.     int i;

  619.     int bs_pointer = 0;

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

  621.     int abs_bord_trail = 16;

  622.     int num_rel_lead, num_rel_trail;

  623.     unsigned bs_num_env_old = ch_data->bs_num_env;

  624. 

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

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

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

  628. 

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

  630.     case FIXFIX:

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

  632.         num_rel_lead                        = ch_data->bs_num_env - 1;

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

  634.             ch_data->bs_amp_res = 0;

  635. 

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

  637.             av_log(ac->avctx, AV_LOG_ERROR,

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

  639.                    ch_data->bs_num_env);

  640.             return -1;

  641.         }

  642. 

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

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

  645. 

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

  647.                    ch_data->bs_num_env;

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

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

  650. 

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

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

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

  654.         break;

  655.     case FIXVAR:

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

  657.         num_rel_trail                       = get_bits(gb, 2);

  658.         ch_data->bs_num_env                 = num_rel_trail + 1;

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

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

  661. 

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

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

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

  665. 

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

  667. 

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

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

  670.         break;

  671.     case VARFIX:

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

  673.         num_rel_lead                        = get_bits(gb, 2);

  674.         ch_data->bs_num_env                 = num_rel_lead + 1;

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

  676. 

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

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

  679. 

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

  681. 

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

  683.         break;

  684.     case VARVAR:

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

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

  687.         num_rel_lead                        = get_bits(gb, 2);

  688.         num_rel_trail                       = get_bits(gb, 2);

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

  690. 

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

  692.             av_log(ac->avctx, AV_LOG_ERROR,

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

  694.                    ch_data->bs_num_env);

  695.             return -1;

  696.         }

  697. 

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

  699. 

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

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

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

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

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

  705. 

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

  707. 

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

  709.         break;

  710.     }

  711. 

  712.     av_assert0(bs_pointer >= 0);

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

  714.         av_log(ac->avctx, AV_LOG_ERROR,

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

  716.                bs_pointer);

  717.         return -1;

  718.     }

  719. 

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

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

  722.             av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");

  723.             return -1;

  724.         }

  725.     }

  726. 

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

  728. 

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

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

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

  732.         int idx;

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

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

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

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

  737.         } else { // VARFIX

  738.             if (!bs_pointer)

  739.                 idx = 1;

  740.             else if (bs_pointer == 1)

  741.                 idx = ch_data->bs_num_env - 1;

  742.             else // bs_pointer > 1

  743.                 idx = bs_pointer - 1;

  744.         }

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

  746.     }

  747. 

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

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

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

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

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

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

  754. 

  755.     return 0;

  756. }

  757. 

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

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

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

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

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

  763. 

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

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

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

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

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

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

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

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

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

  773. }

  774. 

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

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

  777.                           SBRData *ch_data)

  778. {

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

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

  781. }

  782. 

  783. /// Read inverse filtering data

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

  785.                           SBRData *ch_data)

  786. {

  787.     int i;

  788. 

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

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

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

  792. }

  793. 

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

  795.                               SBRData *ch_data, int ch)

  796. {

  797.     int bits;

  798.     int i, j, k;

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

  800.     int t_lav, f_lav;

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

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

  803. 

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

  805.         if (ch_data->bs_amp_res) {

  806.             bits   = 5;

  807.             t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;

  808.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];

  809.             f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

  810.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

  811.         } else {

  812.             bits   = 6;

  813.             t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;

  814.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];

  815.             f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;

  816.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];

  817.         }

  818.     } else {

  819.         if (ch_data->bs_amp_res) {

  820.             bits   = 6;

  821.             t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;

  822.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];

  823.             f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

  824.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

  825.         } else {

  826.             bits   = 7;

  827.             t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;

  828.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];

  829.             f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;

  830.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];

  831.         }

  832.     }

  833. 

  834. #if USE_FIXED

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

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

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

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

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

  840.                     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);

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

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

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

  844.                     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);

  845.                 }

  846.             } else {

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

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

  849.                     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);

  850.                 }

  851.             }

  852.         } else {

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

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

  855.                 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);

  856.         }

  857.     }

  858. #else

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

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

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

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

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

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

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

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

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

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

  869.                 }

  870.             } else {

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

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

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

  874.                 }

  875.             }

  876.         } else {

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

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

  879.                 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);

  880.         }

  881.     }

  882. #endif /* USE_FIXED */

  883. 

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

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

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

  887. }

  888. 

  889. static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,

  890.                            SBRData *ch_data, int ch)

  891. {

  892.     int i, j;

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

  894.     int t_lav, f_lav;

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

  896. 

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

  898.         t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;

  899.         t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];

  900.         f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

  901.         f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

  902.     } else {

  903.         t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;

  904.         t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];

  905.         f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

  906.         f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

  907.     }

  908. 

  909. #if USE_FIXED

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

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

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

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

  914.         } else {

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

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

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

  918.         }

  919.     }

  920. #else

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

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

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

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

  925.         } else {

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

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

  928.                 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);

  929.         }

  930.     }

  931. #endif /* USE_FIXED */

  932. 

  933.     //assign 0th elements of noise_facs from last elements

  934.     memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],

  935.            sizeof(ch_data->noise_facs[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.     if (get_bits1(gb)) // bs_data_extra

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

  975. 

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

  977.         return -1;

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

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

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

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

  982. 

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

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

  985. 

  986.     return 0;

  987. }

  988. 

  989. static int read_sbr_channel_pair_element(AACContext *ac,

  990.                                           SpectralBandReplication *sbr,

  991.                                           GetBitContext *gb)

  992. {

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

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

  995. 

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

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

  998.             return -1;

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

  1000.         read_sbr_dtdf(sbr, gb, &sbr->data[0]);

  1001.         read_sbr_dtdf(sbr, gb, &sbr->data[1]);

  1002.         read_sbr_invf(sbr, gb, &sbr->data[0]);

  1003.         memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));

  1004.         memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));

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

  1006.         read_sbr_noise(sbr, gb, &sbr->data[0], 0);

  1007.         read_sbr_envelope(sbr, gb, &sbr->data[1], 1);

  1008.         read_sbr_noise(sbr, gb, &sbr->data[1], 1);

  1009.     } else {

  1010.         if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||

  1011.             read_sbr_grid(ac, sbr, gb, &sbr->data[1]))

  1012.             return -1;

  1013.         read_sbr_dtdf(sbr, gb, &sbr->data[0]);

  1014.         read_sbr_dtdf(sbr, gb, &sbr->data[1]);

  1015.         read_sbr_invf(sbr, gb, &sbr->data[0]);

  1016.         read_sbr_invf(sbr, gb, &sbr->data[1]);

  1017.         read_sbr_envelope(sbr, gb, &sbr->data[0], 0);

  1018.         read_sbr_envelope(sbr, gb, &sbr->data[1], 1);

  1019.         read_sbr_noise(sbr, gb, &sbr->data[0], 0);

  1020.         read_sbr_noise(sbr, gb, &sbr->data[1], 1);

  1021.     }

  1022. 

  1023.     if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))

  1024.         get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);

  1025.     if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))

  1026.         get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);

  1027. 

  1028.     return 0;

  1029. }

  1030. 

  1031. static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,

  1032.                                   GetBitContext *gb, int id_aac)

  1033. {

  1034.     unsigned int cnt = get_bits_count(gb);

  1035. 

  1036.     sbr->id_aac = id_aac;

  1037. 

  1038.     if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {

  1039.         if (read_sbr_single_channel_element(ac, sbr, gb)) {

  1040.             sbr_turnoff(sbr);

  1041.             return get_bits_count(gb) - cnt;

  1042.         }

  1043.     } else if (id_aac == TYPE_CPE) {

  1044.         if (read_sbr_channel_pair_element(ac, sbr, gb)) {

  1045.             sbr_turnoff(sbr);

  1046.             return get_bits_count(gb) - cnt;

  1047.         }

  1048.     } else {

  1049.         av_log(ac->avctx, AV_LOG_ERROR,

  1050.             "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);

  1051.         sbr_turnoff(sbr);

  1052.         return get_bits_count(gb) - cnt;

  1053.     }

  1054.     if (get_bits1(gb)) { // bs_extended_data

  1055.         int num_bits_left = get_bits(gb, 4); // bs_extension_size

  1056.         if (num_bits_left == 15)

  1057.             num_bits_left += get_bits(gb, 8); // bs_esc_count

  1058. 

  1059.         num_bits_left <<= 3;

  1060.         while (num_bits_left > 7) {

  1061.             num_bits_left -= 2;

  1062.             read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id

  1063.         }

  1064.         if (num_bits_left < 0) {

  1065.             av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");

  1066.         }

  1067.         if (num_bits_left > 0)

  1068.             skip_bits(gb, num_bits_left);

  1069.     }

  1070. 

  1071.     return get_bits_count(gb) - cnt;

  1072. }

  1073. 

  1074. static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)

  1075. {

  1076.     int err;

  1077.     err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);

  1078.     if (err >= 0)

  1079.         err = sbr_make_f_derived(ac, sbr);

  1080.     if (err < 0) {

  1081.         av_log(ac->avctx, AV_LOG_ERROR,

  1082.                "SBR reset failed. Switching SBR to pure upsampling mode.\n");

  1083.         sbr_turnoff(sbr);

  1084.     }

  1085. }

  1086. 

  1087. /**

  1088.  * Decode Spectral Band Replication extension data; reference: table 4.55.

  1089.  *

  1090.  * @param   crc flag indicating the presence of CRC checksum

  1091.  * @param   cnt length of TYPE_FIL syntactic element in bytes

  1092.  *

  1093.  * @return  Returns number of bytes consumed from the TYPE_FIL element.

  1094.  */

  1095. int AAC_RENAME(ff_decode_sbr_extension)(AACContext *ac, SpectralBandReplication *sbr,

  1096.                             GetBitContext *gb_host, int crc, int cnt, int id_aac)

  1097. {

  1098.     unsigned int num_sbr_bits = 0, num_align_bits;

  1099.     unsigned bytes_read;

  1100.     GetBitContext gbc = *gb_host, *gb = &gbc;

  1101.     skip_bits_long(gb_host, cnt*8 - 4);

  1102. 

  1103.     sbr->reset = 0;

  1104. 

  1105.     if (!sbr->sample_rate)

  1106.         sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support

  1107.     if (!ac->oc[1].m4ac.ext_sample_rate)

  1108.         ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;

  1109. 

  1110.     if (crc) {

  1111.         skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check

  1112.         num_sbr_bits += 10;

  1113.     }

  1114. 

  1115.     //Save some state from the previous frame.

  1116.     sbr->kx[0] = sbr->kx[1];

  1117.     sbr->m[0] = sbr->m[1];

  1118.     sbr->kx_and_m_pushed = 1;

  1119. 

  1120.     num_sbr_bits++;

  1121.     if (get_bits1(gb)) // bs_header_flag

  1122.         num_sbr_bits += read_sbr_header(sbr, gb);

  1123. 

  1124.     if (sbr->reset)

  1125.         sbr_reset(ac, sbr);

  1126. 

  1127.     if (sbr->start)

  1128.         num_sbr_bits  += read_sbr_data(ac, sbr, gb, id_aac);

  1129. 

  1130.     num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;

  1131.     bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);

  1132. 

  1133.     if (bytes_read > cnt) {

  1134.         av_log(ac->avctx, AV_LOG_ERROR,

  1135.                "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);

  1136.     }

  1137.     return cnt;

  1138. }

  1139. 

  1140. /**

  1141.  * Analysis QMF Bank (14496-3 sp04 p206)

  1142.  *

  1143.  * @param   x       pointer to the beginning of the first sample window

  1144.  * @param   W       array of complex-valued samples split into subbands

  1145.  */

  1146. #ifndef sbr_qmf_analysis

  1147. #if USE_FIXED

  1148. static void sbr_qmf_analysis(AVFixedDSPContext *dsp, FFTContext *mdct,

  1149. #else

  1150. static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,

  1151. #endif /* USE_FIXED */

  1152.                              SBRDSPContext *sbrdsp, const INTFLOAT *in, INTFLOAT *x,

  1153.                              INTFLOAT z[320], INTFLOAT W[2][32][32][2], int buf_idx)

  1154. {

  1155.     int i;

  1156.     memcpy(x    , x+1024, (320-32)*sizeof(x[0]));

  1157.     memcpy(x+288, in,         1024*sizeof(x[0]));

  1158.     for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames

  1159.                                // are not supported

  1160.         dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);

  1161.         sbrdsp->sum64x5(z);

  1162.         sbrdsp->qmf_pre_shuffle(z);

  1163.         mdct->imdct_half(mdct, z, z+64);

  1164.         sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);

  1165.         x += 32;

  1166.     }

  1167. }

  1168. #endif

  1169. 

  1170. /**

  1171.  * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank

  1172.  * (14496-3 sp04 p206)

  1173.  */

  1174. #ifndef sbr_qmf_synthesis

  1175. static void sbr_qmf_synthesis(FFTContext *mdct,

  1176. #if USE_FIXED

  1177.                               SBRDSPContext *sbrdsp, AVFixedDSPContext *dsp,

  1178. #else

  1179.                               SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,

  1180. #endif /* USE_FIXED */

  1181.                               INTFLOAT *out, INTFLOAT X[2][38][64],

  1182.                               INTFLOAT mdct_buf[2][64],

  1183.                               INTFLOAT *v0, int *v_off, const unsigned int div)

  1184. {

  1185.     int i, n;

  1186.     const INTFLOAT *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;

  1187.     const int step = 128 >> div;

  1188.     INTFLOAT *v;

  1189.     for (i = 0; i < 32; i++) {

  1190.         if (*v_off < step) {

  1191.             int saved_samples = (1280 - 128) >> div;

  1192.             memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(INTFLOAT));

  1193.             *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;

  1194.         } else {

  1195.             *v_off -= step;

  1196.         }

  1197.         v = v0 + *v_off;

  1198.         if (div) {

  1199.             for (n = 0; n < 32; n++) {

  1200.                 X[0][i][   n] = -X[0][i][n];

  1201.                 X[0][i][32+n] =  X[1][i][31-n];

  1202.             }

  1203.             mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

  1204.             sbrdsp->qmf_deint_neg(v, mdct_buf[0]);

  1205.         } else {

  1206.             sbrdsp->neg_odd_64(X[1][i]);

  1207.             mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

  1208.             mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);

  1209.             sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);

  1210.         }

  1211.         dsp->vector_fmul    (out, v                , sbr_qmf_window                       , 64 >> div);

  1212.         dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out   , 64 >> div);

  1213.         dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out   , 64 >> div);

  1214.         dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out   , 64 >> div);

  1215.         dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out   , 64 >> div);

  1216.         dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out   , 64 >> div);

  1217.         dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out   , 64 >> div);

  1218.         dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out   , 64 >> div);

  1219.         dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out   , 64 >> div);

  1220.         dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out   , 64 >> div);

  1221.         out += 64 >> div;

  1222.     }

  1223. }

  1224. #endif

  1225. 

  1226. /// Generate the subband filtered lowband

  1227. static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,

  1228.                       INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2],

  1229.                       int buf_idx)

  1230. {

  1231.     int i, k;

  1232.     const int t_HFGen = 8;

  1233.     const int i_f = 32;

  1234.     memset(X_low, 0, 32*sizeof(*X_low));

  1235.     for (k = 0; k < sbr->kx[1]; k++) {

  1236.         for (i = t_HFGen; i < i_f + t_HFGen; i++) {

  1237.             X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];

  1238.             X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];

  1239.         }

  1240.     }

  1241.     buf_idx = 1-buf_idx;

  1242.     for (k = 0; k < sbr->kx[0]; k++) {

  1243.         for (i = 0; i < t_HFGen; i++) {

  1244.             X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];

  1245.             X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];

  1246.         }

  1247.     }

  1248.     return 0;

  1249. }

  1250. 

  1251. /// High Frequency Generator (14496-3 sp04 p215)

  1252. static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,

  1253.                       INTFLOAT X_high[64][40][2], const INTFLOAT X_low[32][40][2],

  1254.                       const INTFLOAT (*alpha0)[2], const INTFLOAT (*alpha1)[2],

  1255.                       const INTFLOAT bw_array[5], const uint8_t *t_env,

  1256.                       int bs_num_env)

  1257. {

  1258.     int j, x;

  1259.     int g = 0;

  1260.     int k = sbr->kx[1];

  1261.     for (j = 0; j < sbr->num_patches; j++) {

  1262.         for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {

  1263.             const int p = sbr->patch_start_subband[j] + x;

  1264.             while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])

  1265.                 g++;

  1266.             g--;

  1267. 

  1268.             if (g < 0) {

  1269.                 av_log(ac->avctx, AV_LOG_ERROR,

  1270.                        "ERROR : no subband found for frequency %d\n", k);

  1271.                 return -1;

  1272.             }

  1273. 

  1274.             sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,

  1275.                             X_low[p]  + ENVELOPE_ADJUSTMENT_OFFSET,

  1276.                             alpha0[p], alpha1[p], bw_array[g],

  1277.                             2 * t_env[0], 2 * t_env[bs_num_env]);

  1278.         }

  1279.     }

  1280.     if (k < sbr->m[1] + sbr->kx[1])

  1281.         memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));

  1282. 

  1283.     return 0;

  1284. }

  1285. 

  1286. /// Generate the subband filtered lowband

  1287. static int sbr_x_gen(SpectralBandReplication *sbr, INTFLOAT X[2][38][64],

  1288.                      const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2],

  1289.                      const INTFLOAT X_low[32][40][2], int ch)

  1290. {

  1291.     int k, i;

  1292.     const int i_f = 32;

  1293.     const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);

  1294.     memset(X, 0, 2*sizeof(*X));

  1295.     for (k = 0; k < sbr->kx[0]; k++) {

  1296.         for (i = 0; i < i_Temp; i++) {

  1297.             X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

  1298.             X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

  1299.         }

  1300.     }

  1301.     for (; k < sbr->kx[0] + sbr->m[0]; k++) {

  1302.         for (i = 0; i < i_Temp; i++) {

  1303.             X[0][i][k] = Y0[i + i_f][k][0];

  1304.             X[1][i][k] = Y0[i + i_f][k][1];

  1305.         }

  1306.     }

  1307. 

  1308.     for (k = 0; k < sbr->kx[1]; k++) {

  1309.         for (i = i_Temp; i < 38; i++) {

  1310.             X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

  1311.             X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

  1312.         }

  1313.     }

  1314.     for (; k < sbr->kx[1] + sbr->m[1]; k++) {

  1315.         for (i = i_Temp; i < i_f; i++) {

  1316.             X[0][i][k] = Y1[i][k][0];

  1317.             X[1][i][k] = Y1[i][k][1];

  1318.         }

  1319.     }

  1320.     return 0;

  1321. }

  1322. 

  1323. /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping

  1324.  * (14496-3 sp04 p217)

  1325.  */

  1326. static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,

  1327.                         SBRData *ch_data, int e_a[2])

  1328. {

  1329.     int e, i, m;

  1330. 

  1331.     memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));

  1332.     for (e = 0; e < ch_data->bs_num_env; e++) {

  1333.         const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];

  1334.         uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

  1335.         int k;

  1336. 

  1337.         if (sbr->kx[1] != table[0]) {

  1338.             av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "

  1339.                    "Derived frequency tables were not regenerated.\n");

  1340.             sbr_turnoff(sbr);

  1341.             return AVERROR_BUG;

  1342.         }

  1343.         for (i = 0; i < ilim; i++)

  1344.             for (m = table[i]; m < table[i + 1]; m++)

  1345.                 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];

  1346. 

  1347.         // ch_data->bs_num_noise > 1 => 2 noise floors

  1348.         k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);

  1349.         for (i = 0; i < sbr->n_q; i++)

  1350.             for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)

  1351.                 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];

  1352. 

  1353.         for (i = 0; i < sbr->n[1]; i++) {

  1354.             if (ch_data->bs_add_harmonic_flag) {

  1355.                 const unsigned int m_midpoint =

  1356.                     (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;

  1357. 

  1358.                 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *

  1359.                     (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));

  1360.             }

  1361.         }

  1362. 

  1363.         for (i = 0; i < ilim; i++) {

  1364.             int additional_sinusoid_present = 0;

  1365.             for (m = table[i]; m < table[i + 1]; m++) {

  1366.                 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {

  1367.                     additional_sinusoid_present = 1;

  1368.                     break;

  1369.                 }

  1370.             }

  1371.             memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,

  1372.                    (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));

  1373.         }

  1374.     }

  1375. 

  1376.     memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));

  1377.     return 0;

  1378. }

  1379. 

  1380. /// Estimation of current envelope (14496-3 sp04 p218)

  1381. static void sbr_env_estimate(AAC_FLOAT (*e_curr)[48], INTFLOAT X_high[64][40][2],

  1382.                              SpectralBandReplication *sbr, SBRData *ch_data)

  1383. {

  1384.     int e, m;

  1385.     int kx1 = sbr->kx[1];

  1386. 

  1387.     if (sbr->bs_interpol_freq) {

  1388.         for (e = 0; e < ch_data->bs_num_env; e++) {

  1389. #if USE_FIXED

  1390.             const SoftFloat recip_env_size = av_int2sf(0x20000000 / (ch_data->t_env[e + 1] - ch_data->t_env[e]), 30);

  1391. #else

  1392.             const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);

  1393. #endif /* USE_FIXED */

  1394.             int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1395.             int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1396. 

  1397.             for (m = 0; m < sbr->m[1]; m++) {

  1398.                 AAC_FLOAT sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);

  1399. #if USE_FIXED

  1400.                 e_curr[e][m] = av_mul_sf(sum, recip_env_size);

  1401. #else

  1402.                 e_curr[e][m] = sum * recip_env_size;

  1403. #endif /* USE_FIXED */

  1404.             }

  1405.         }

  1406.     } else {

  1407.         int k, p;

  1408. 

  1409.         for (e = 0; e < ch_data->bs_num_env; e++) {

  1410.             const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);

  1411.             int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1412.             int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1413.             const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

  1414. 

  1415.             for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {

  1416. #if USE_FIXED

  1417.                 SoftFloat sum = { 0, 0 };

  1418.                 const SoftFloat den = av_int2sf(0x20000000 / (env_size * (table[p + 1] - table[p])), 29);

  1419.                 for (k = table[p]; k < table[p + 1]; k++) {

  1420.                     sum = av_add_sf(sum, sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb));

  1421.                 }

  1422.                 sum = av_mul_sf(sum, den);

  1423. #else

  1424.                 float sum = 0.0f;

  1425.                 const int den = env_size * (table[p + 1] - table[p]);

  1426. 

  1427.                 for (k = table[p]; k < table[p + 1]; k++) {

  1428.                     sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);

  1429.                 }

  1430.                 sum /= den;

  1431. #endif /* USE_FIXED */

  1432.                 for (k = table[p]; k < table[p + 1]; k++) {

  1433.                     e_curr[e][k - kx1] = sum;

  1434.                 }

  1435.             }

  1436.         }

  1437.     }

  1438. }

  1439. 

  1440. void AAC_RENAME(ff_sbr_apply)(AACContext *ac, SpectralBandReplication *sbr, int id_aac,

  1441.                   INTFLOAT* L, INTFLOAT* R)

  1442. {

  1443.     int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;

  1444.     int ch;

  1445.     int nch = (id_aac == TYPE_CPE) ? 2 : 1;

  1446.     int err;

  1447. 

  1448.     if (id_aac != sbr->id_aac) {

  1449.         av_log(ac->avctx, AV_LOG_ERROR,

  1450.             "element type mismatch %d != %d\n", id_aac, sbr->id_aac);

  1451.         sbr_turnoff(sbr);

  1452.     }

  1453. 

  1454.     if (!sbr->kx_and_m_pushed) {

  1455.         sbr->kx[0] = sbr->kx[1];

  1456.         sbr->m[0] = sbr->m[1];

  1457.     } else {

  1458.         sbr->kx_and_m_pushed = 0;

  1459.     }

  1460. 

  1461.     if (sbr->start) {

  1462.         sbr_dequant(sbr, id_aac);

  1463.     }

  1464.     for (ch = 0; ch < nch; ch++) {

  1465.         /* decode channel */

  1466.         sbr_qmf_analysis(ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,

  1467.                          (INTFLOAT*)sbr->qmf_filter_scratch,

  1468.                          sbr->data[ch].W, sbr->data[ch].Ypos);

  1469.         sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low,

  1470.                           (const INTFLOAT (*)[32][32][2]) sbr->data[ch].W,

  1471.                           sbr->data[ch].Ypos);

  1472.         sbr->data[ch].Ypos ^= 1;

  1473.         if (sbr->start) {

  1474.             sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1,

  1475.                                          (const INTFLOAT (*)[40][2]) sbr->X_low, sbr->k[0]);

  1476.             sbr_chirp(sbr, &sbr->data[ch]);

  1477.             av_assert0(sbr->data[ch].bs_num_env > 0);

  1478.             sbr_hf_gen(ac, sbr, sbr->X_high,

  1479.                        (const INTFLOAT (*)[40][2]) sbr->X_low,

  1480.                        (const INTFLOAT (*)[2]) sbr->alpha0,

  1481.                        (const INTFLOAT (*)[2]) sbr->alpha1,

  1482.                        sbr->data[ch].bw_array, sbr->data[ch].t_env,

  1483.                        sbr->data[ch].bs_num_env);

  1484. 

  1485.             // hf_adj

  1486.             err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

  1487.             if (!err) {

  1488.                 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);

  1489.                 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

  1490.                 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],

  1491.                                 (const INTFLOAT (*)[40][2]) sbr->X_high,

  1492.                                 sbr, &sbr->data[ch],

  1493.                                 sbr->data[ch].e_a);

  1494.             }

  1495.         }

  1496. 

  1497.         /* synthesis */

  1498.         sbr->c.sbr_x_gen(sbr, sbr->X[ch],

  1499.                   (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[1-sbr->data[ch].Ypos],

  1500.                   (const INTFLOAT (*)[64][2]) sbr->data[ch].Y[  sbr->data[ch].Ypos],

  1501.                   (const INTFLOAT (*)[40][2]) sbr->X_low, ch);

  1502.     }

  1503. 

  1504.     if (ac->oc[1].m4ac.ps == 1) {

  1505.         if (sbr->ps.start) {

  1506.             AAC_RENAME(ff_ps_apply)(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);

  1507.         } else {

  1508.             memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));

  1509.         }

  1510.         nch = 2;

  1511.     }

  1512. 

  1513.     sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,

  1514.                       L, sbr->X[0], sbr->qmf_filter_scratch,

  1515.                       sbr->data[0].synthesis_filterbank_samples,

  1516.                       &sbr->data[0].synthesis_filterbank_samples_offset,

  1517.                       downsampled);

  1518.     if (nch == 2)

  1519.         sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, ac->fdsp,

  1520.                           R, sbr->X[1], sbr->qmf_filter_scratch,

  1521.                           sbr->data[1].synthesis_filterbank_samples,

  1522.                           &sbr->data[1].synthesis_filterbank_samples_offset,

  1523.                           downsampled);

  1524. }

  1525. 

  1526. static void aacsbr_func_ptr_init(AACSBRContext *c)

  1527. {

  1528.     c->sbr_lf_gen            = sbr_lf_gen;

  1529.     c->sbr_hf_assemble       = sbr_hf_assemble;

  1530.     c->sbr_x_gen             = sbr_x_gen;

  1531.     c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;

  1532. 

  1533. #if !USE_FIXED

  1534.     if(ARCH_MIPS)

  1535.         ff_aacsbr_func_ptr_init_mips(c);

  1536. #endif

  1537. }