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FFmpeg/libavcodec/aacsbr.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.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * AAC Spectral Band Replication decoding functions

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

  27.  */

  28. 

  29. #include "aac.h"

  30. #include "sbr.h"

  31. #include "aacsbr.h"

  32. #include "aacsbrdata.h"

  33. #include "fft.h"

  34. #include "aacps.h"

  35. #include "sbrdsp.h"

  36. #include "libavutil/internal.h"

  37. #include "libavutil/libm.h"

  38. #include "libavutil/avassert.h"

  39. 

  40. #include <stdint.h>

  41. #include <float.h>

  42. #include <math.h>

  43. 

  44. #define ENVELOPE_ADJUSTMENT_OFFSET 2

  45. #define NOISE_FLOOR_OFFSET 6.0f

  46. 

  47. #if ARCH_MIPS

  48. #include "mips/aacsbr_mips.h"

  49. #endif /* ARCH_MIPS */

  50. 

  51. /**

  52.  * SBR VLC tables

  53.  */

  54. enum {

  55.     T_HUFFMAN_ENV_1_5DB,

  56.     F_HUFFMAN_ENV_1_5DB,

  57.     T_HUFFMAN_ENV_BAL_1_5DB,

  58.     F_HUFFMAN_ENV_BAL_1_5DB,

  59.     T_HUFFMAN_ENV_3_0DB,

  60.     F_HUFFMAN_ENV_3_0DB,

  61.     T_HUFFMAN_ENV_BAL_3_0DB,

  62.     F_HUFFMAN_ENV_BAL_3_0DB,

  63.     T_HUFFMAN_NOISE_3_0DB,

  64.     T_HUFFMAN_NOISE_BAL_3_0DB,

  65. };

  66. 

  67. /**

  68.  * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)

  69.  */

  70. enum {

  71.     FIXFIX,

  72.     FIXVAR,

  73.     VARFIX,

  74.     VARVAR,

  75. };

  76. 

  77. enum {

  78.     EXTENSION_ID_PS = 2,

  79. };

  80. 

  81. static VLC vlc_sbr[10];

  82. static const int8_t vlc_sbr_lav[10] =

  83.     { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };

  84. 

  85. #define SBR_INIT_VLC_STATIC(num, size) \

  86.     INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size,     \

  87.                     sbr_tmp[num].sbr_bits ,                      1,                      1, \

  88.                     sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \

  89.                     size)

  90. 

  91. #define SBR_VLC_ROW(name) \

  92.     { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }

  93. 

  94. static void aacsbr_func_ptr_init(AACSBRContext *c);

  95. 

  96. av_cold void ff_aac_sbr_init(void)

  97. {

  98.     int n;

  99.     static const struct {

  100.         const void *sbr_codes, *sbr_bits;

  101.         const unsigned int table_size, elem_size;

  102.     } sbr_tmp[] = {

  103.         SBR_VLC_ROW(t_huffman_env_1_5dB),

  104.         SBR_VLC_ROW(f_huffman_env_1_5dB),

  105.         SBR_VLC_ROW(t_huffman_env_bal_1_5dB),

  106.         SBR_VLC_ROW(f_huffman_env_bal_1_5dB),

  107.         SBR_VLC_ROW(t_huffman_env_3_0dB),

  108.         SBR_VLC_ROW(f_huffman_env_3_0dB),

  109.         SBR_VLC_ROW(t_huffman_env_bal_3_0dB),

  110.         SBR_VLC_ROW(f_huffman_env_bal_3_0dB),

  111.         SBR_VLC_ROW(t_huffman_noise_3_0dB),

  112.         SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),

  113.     };

  114. 

  115.     // SBR VLC table initialization

  116.     SBR_INIT_VLC_STATIC(0, 1098);

  117.     SBR_INIT_VLC_STATIC(1, 1092);

  118.     SBR_INIT_VLC_STATIC(2, 768);

  119.     SBR_INIT_VLC_STATIC(3, 1026);

  120.     SBR_INIT_VLC_STATIC(4, 1058);

  121.     SBR_INIT_VLC_STATIC(5, 1052);

  122.     SBR_INIT_VLC_STATIC(6, 544);

  123.     SBR_INIT_VLC_STATIC(7, 544);

  124.     SBR_INIT_VLC_STATIC(8, 592);

  125.     SBR_INIT_VLC_STATIC(9, 512);

  126. 

  127.     for (n = 1; n < 320; n++)

  128.         sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];

  129.     sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];

  130.     sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];

  131. 

  132.     for (n = 0; n < 320; n++)

  133.         sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];

  134. 

  135.     ff_ps_init();

  136. }

  137. 

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

  139. static void sbr_turnoff(SpectralBandReplication *sbr) {

  140.     sbr->start = 0;

  141.     // Init defults used in pure upsampling mode

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

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

  144.     // Reset values for first SBR header

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

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

  147. }

  148. 

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

  150. {

  151.     if(sbr->mdct.mdct_bits)

  152.         return;

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

  154.     sbr_turnoff(sbr);

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

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

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

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

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

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

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

  162.     ff_ps_ctx_init(&sbr->ps);

  163.     ff_sbrdsp_init(&sbr->dsp);

  164.     aacsbr_func_ptr_init(&sbr->c);

  165. }

  166. 

  167. av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)

  168. {

  169.     ff_mdct_end(&sbr->mdct);

  170.     ff_mdct_end(&sbr->mdct_ana);

  171. }

  172. 

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

  174. {

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

  176. }

  177. 

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

  179. {

  180.     int i;

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

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

  183.             return 1;

  184.     return 0;

  185. }

  186. 

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

  188. static void sbr_make_f_tablelim(SpectralBandReplication *sbr)

  189. {

  190.     int k;

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

  192.         static const float bands_warped[3] = { 1.32715174233856803909f,   //2^(0.49/1.2)

  193.                                                1.18509277094158210129f,   //2^(0.49/2)

  194.                                                1.11987160404675912501f }; //2^(0.49/3)

  195.         const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];

  196.         int16_t patch_borders[7];

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

  198. 

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

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

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

  202. 

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

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

  205.         if (sbr->num_patches > 1)

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

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

  208. 

  209.         qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],

  210.               sizeof(sbr->f_tablelim[0]),

  211.               qsort_comparison_function_int16);

  212. 

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

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

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

  216.                 *++out = *in++;

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

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

  219.                 in++;

  220.                 sbr->n_lim--;

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

  222.                 *out = *in++;

  223.                 sbr->n_lim--;

  224.             } else {

  225.                 *++out = *in++;

  226.             }

  227.         }

  228.     } else {

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

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

  231.         sbr->n_lim = 1;

  232.     }

  233. }

  234. 

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

  236. {

  237.     unsigned int cnt = get_bits_count(gb);

  238.     uint8_t bs_header_extra_1;

  239.     uint8_t bs_header_extra_2;

  240.     int old_bs_limiter_bands = sbr->bs_limiter_bands;

  241.     SpectrumParameters old_spectrum_params;

  242. 

  243.     sbr->start = 1;

  244. 

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

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

  247. 

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

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

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

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

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

  253. 

  254.     bs_header_extra_1 = get_bits1(gb);

  255.     bs_header_extra_2 = get_bits1(gb);

  256. 

  257.     if (bs_header_extra_1) {

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

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

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

  261.     } else {

  262.         sbr->spectrum_params.bs_freq_scale  = 2;

  263.         sbr->spectrum_params.bs_alter_scale = 1;

  264.         sbr->spectrum_params.bs_noise_bands = 2;

  265.     }

  266. 

  267.     // Check if spectrum parameters changed

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

  269.         sbr->reset = 1;

  270. 

  271.     if (bs_header_extra_2) {

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

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

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

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

  276.     } else {

  277.         sbr->bs_limiter_bands  = 2;

  278.         sbr->bs_limiter_gains  = 2;

  279.         sbr->bs_interpol_freq  = 1;

  280.         sbr->bs_smoothing_mode = 1;

  281.     }

  282. 

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

  284.         sbr_make_f_tablelim(sbr);

  285. 

  286.     return get_bits_count(gb) - cnt;

  287. }

  288. 

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

  290. {

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

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

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

  294.     return min;

  295. }

  296. 

  297. static void make_bands(int16_t* bands, int start, int stop, int num_bands)

  298. {

  299.     int k, previous, present;

  300.     float base, prod;

  301. 

  302.     base = powf((float)stop / start, 1.0f / num_bands);

  303.     prod = start;

  304.     previous = start;

  305. 

  306.     for (k = 0; k < num_bands-1; k++) {

  307.         prod *= base;

  308.         present  = lrintf(prod);

  309.         bands[k] = present - previous;

  310.         previous = present;

  311.     }

  312.     bands[num_bands-1] = stop - previous;

  313. }

  314. 

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

  316. {

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

  318.     if (n_master <= 0) {

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

  320.         return -1;

  321.     }

  322.     if (bs_xover_band >= n_master) {

  323.         av_log(avctx, AV_LOG_ERROR,

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

  325.                bs_xover_band);

  326.         return -1;

  327.     }

  328.     return 0;

  329. }

  330. 

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

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

  333.                              SpectrumParameters *spectrum)

  334. {

  335.     unsigned int temp, max_qmf_subbands;

  336.     unsigned int start_min, stop_min;

  337.     int k;

  338.     const int8_t *sbr_offset_ptr;

  339.     int16_t stop_dk[13];

  340. 

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

  342.         temp = 3000;

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

  344.         temp = 4000;

  345.     } else

  346.         temp = 5000;

  347. 

  348.     switch (sbr->sample_rate) {

  349.     case 16000:

  350.         sbr_offset_ptr = sbr_offset[0];

  351.         break;

  352.     case 22050:

  353.         sbr_offset_ptr = sbr_offset[1];

  354.         break;

  355.     case 24000:

  356.         sbr_offset_ptr = sbr_offset[2];

  357.         break;

  358.     case 32000:

  359.         sbr_offset_ptr = sbr_offset[3];

  360.         break;

  361.     case 44100: case 48000: case 64000:

  362.         sbr_offset_ptr = sbr_offset[4];

  363.         break;

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

  365.         sbr_offset_ptr = sbr_offset[5];

  366.         break;

  367.     default:

  368.         av_log(ac->avctx, AV_LOG_ERROR,

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

  370.         return -1;

  371.     }

  372. 

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

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

  375. 

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

  377. 

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

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

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

  381.         qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);

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

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

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

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

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

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

  388.     } else {

  389.         av_log(ac->avctx, AV_LOG_ERROR,

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

  391.         return -1;

  392.     }

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

  394. 

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

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

  397.         max_qmf_subbands = 48;

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

  399.         max_qmf_subbands = 35;

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

  401.         max_qmf_subbands = 32;

  402. 

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

  404.         av_log(ac->avctx, AV_LOG_ERROR,

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

  406.         return -1;

  407.     }

  408. 

  409.     if (!spectrum->bs_freq_scale) {

  410.         int dk, k2diff;

  411. 

  412.         dk = spectrum->bs_alter_scale + 1;

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

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

  415.             return -1;

  416. 

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

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

  419. 

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

  421.         if (k2diff < 0) {

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

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

  424.         } else if (k2diff) {

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

  426.         }

  427. 

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

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

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

  431. 

  432.     } else {

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

  434.         int two_regions, num_bands_0;

  435.         int vdk0_max, vdk1_min;

  436.         int16_t vk0[49];

  437. 

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

  439.             two_regions = 1;

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

  441.         } else {

  442.             two_regions = 0;

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

  444.         }

  445. 

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

  447. 

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

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

  450.             return -1;

  451.         }

  452. 

  453.         vk0[0] = 0;

  454. 

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

  456. 

  457.         qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);

  458.         vdk0_max = vk0[num_bands_0];

  459. 

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

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

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

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

  464.                 return -1;

  465.             }

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

  467.         }

  468. 

  469.         if (two_regions) {

  470.             int16_t vk1[49];

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

  472.                                                      : 1.0f; // bs_alter_scale = {0,1}

  473.             int num_bands_1 = lrintf(half_bands * invwarp *

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

  475. 

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

  477. 

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

  479. 

  480.             if (vdk1_min < vdk0_max) {

  481.                 int change;

  482.                 qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);

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

  484.                 vk1[1]           += change;

  485.                 vk1[num_bands_1] -= change;

  486.             }

  487. 

  488.             qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);

  489. 

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

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

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

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

  494.                     return -1;

  495.                 }

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

  497.             }

  498. 

  499.             sbr->n_master = num_bands_0 + num_bands_1;

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

  501.                 return -1;

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

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

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

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

  506. 

  507.         } else {

  508.             sbr->n_master = num_bands_0;

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

  510.                 return -1;

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

  512.         }

  513.     }

  514. 

  515.     return 0;

  516. }

  517. 

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

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

  520. {

  521.     int i, k, sb = 0;

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

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

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

  525. 

  526.     sbr->num_patches = 0;

  527. 

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

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

  530.     } else

  531.         k = sbr->n_master;

  532. 

  533.     do {

  534.         int odd = 0;

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

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

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

  538.         }

  539. 

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

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

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

  543.         // count of 6 patches

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

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

  546.             return -1;

  547.         }

  548. 

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

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

  551. 

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

  553.             usb = sb;

  554.             msb = sb;

  555.             sbr->num_patches++;

  556.         } else

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

  558. 

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

  560.             k = sbr->n_master;

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

  562. 

  563.     if (sbr->num_patches > 1 && sbr->patch_num_subbands[sbr->num_patches-1] < 3)

  564.         sbr->num_patches--;

  565. 

  566.     return 0;

  567. }

  568. 

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

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

  571. {

  572.     int k, temp;

  573. 

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

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

  576. 

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

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

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

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

  581. 

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

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

  584.         av_log(ac->avctx, AV_LOG_ERROR,

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

  586.         return -1;

  587.     }

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

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

  590.         return -1;

  591.     }

  592. 

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

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

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

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

  597. 

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

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

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

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

  602.         return -1;

  603.     }

  604. 

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

  606.     temp = 0;

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

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

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

  610.     }

  611. 

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

  613.         return -1;

  614. 

  615.     sbr_make_f_tablelim(sbr);

  616. 

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

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

  619. 

  620.     return 0;

  621. }

  622. 

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

  624.                                               int elements)

  625. {

  626.     int i;

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

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

  629.     }

  630. }

  631. 

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

  633. static const int8_t ceil_log2[] = {

  634.     0, 1, 2, 2, 3, 3,

  635. };

  636. 

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

  638.                          GetBitContext *gb, SBRData *ch_data)

  639. {

  640.     int i;

  641.     unsigned bs_pointer = 0;

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

  643.     int abs_bord_trail = 16;

  644.     int num_rel_lead, num_rel_trail;

  645.     unsigned bs_num_env_old = ch_data->bs_num_env;

  646. 

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

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

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

  650. 

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

  652.     case FIXFIX:

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

  654.         num_rel_lead                        = ch_data->bs_num_env - 1;

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

  656.             ch_data->bs_amp_res = 0;

  657. 

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

  659.             av_log(ac->avctx, AV_LOG_ERROR,

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

  661.                    ch_data->bs_num_env);

  662.             return -1;

  663.         }

  664. 

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

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

  667. 

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

  669.                    ch_data->bs_num_env;

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

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

  672. 

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

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

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

  676.         break;

  677.     case FIXVAR:

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

  679.         num_rel_trail                       = get_bits(gb, 2);

  680.         ch_data->bs_num_env                 = num_rel_trail + 1;

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

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

  683. 

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

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

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

  687. 

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

  689. 

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

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

  692.         break;

  693.     case VARFIX:

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

  695.         num_rel_lead                        = get_bits(gb, 2);

  696.         ch_data->bs_num_env                 = num_rel_lead + 1;

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

  698. 

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

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

  701. 

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

  703. 

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

  705.         break;

  706.     case VARVAR:

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

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

  709.         num_rel_lead                        = get_bits(gb, 2);

  710.         num_rel_trail                       = get_bits(gb, 2);

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

  712. 

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

  714.             av_log(ac->avctx, AV_LOG_ERROR,

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

  716.                    ch_data->bs_num_env);

  717.             return -1;

  718.         }

  719. 

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

  721. 

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

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

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

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

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

  727. 

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

  729. 

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

  731.         break;

  732.     }

  733. 

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

  735.         av_log(ac->avctx, AV_LOG_ERROR,

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

  737.                bs_pointer);

  738.         return -1;

  739.     }

  740. 

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

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

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

  744.             return -1;

  745.         }

  746.     }

  747. 

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

  749. 

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

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

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

  753.         unsigned int idx;

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

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

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

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

  758.         } else { // VARFIX

  759.             if (!bs_pointer)

  760.                 idx = 1;

  761.             else if (bs_pointer == 1)

  762.                 idx = ch_data->bs_num_env - 1;

  763.             else // bs_pointer > 1

  764.                 idx = bs_pointer - 1;

  765.         }

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

  767.     }

  768. 

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

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

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

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

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

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

  775. 

  776.     return 0;

  777. }

  778. 

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

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

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

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

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

  784. 

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

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

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

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

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

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

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

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

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

  794. }

  795. 

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

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

  798.                           SBRData *ch_data)

  799. {

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

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

  802. }

  803. 

  804. /// Read inverse filtering data

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

  806.                           SBRData *ch_data)

  807. {

  808.     int i;

  809. 

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

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

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

  813. }

  814. 

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

  816.                               SBRData *ch_data, int ch)

  817. {

  818.     int bits;

  819.     int i, j, k;

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

  821.     int t_lav, f_lav;

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

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

  824. 

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

  826.         if (ch_data->bs_amp_res) {

  827.             bits   = 5;

  828.             t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;

  829.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];

  830.             f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

  831.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

  832.         } else {

  833.             bits   = 6;

  834.             t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;

  835.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];

  836.             f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;

  837.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];

  838.         }

  839.     } else {

  840.         if (ch_data->bs_amp_res) {

  841.             bits   = 6;

  842.             t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;

  843.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];

  844.             f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

  845.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

  846.         } else {

  847.             bits   = 7;

  848.             t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;

  849.             t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];

  850.             f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;

  851.             f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];

  852.         }

  853.     }

  854. 

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

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

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

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

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

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

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

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

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

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

  865.                 }

  866.             } else {

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

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

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

  870.                 }

  871.             }

  872.         } else {

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

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

  875.                 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);

  876.         }

  877.     }

  878. 

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

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

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

  882. }

  883. 

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

  885.                            SBRData *ch_data, int ch)

  886. {

  887.     int i, j;

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

  889.     int t_lav, f_lav;

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

  891. 

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

  893.         t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;

  894.         t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];

  895.         f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;

  896.         f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];

  897.     } else {

  898.         t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;

  899.         t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];

  900.         f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;

  901.         f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];

  902.     }

  903. 

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

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

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

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

  908.         } else {

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

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

  911.                 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);

  912.         }

  913.     }

  914. 

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

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

  917.            sizeof(ch_data->noise_facs[0]));

  918. }

  919. 

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

  921.                                GetBitContext *gb,

  922.                                int bs_extension_id, int *num_bits_left)

  923. {

  924.     switch (bs_extension_id) {

  925.     case EXTENSION_ID_PS:

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

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

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

  929.             *num_bits_left = 0;

  930.         } else {

  931. #if 1

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

  933. #else

  934.             av_log_missing_feature(ac->avctx, "Parametric Stereo", 0);

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

  936.             *num_bits_left = 0;

  937. #endif

  938.         }

  939.         break;

  940.     default:

  941.         // some files contain 0-padding

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

  943.             av_log_missing_feature(ac->avctx, "Reserved SBR extensions", 1);

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

  945.         *num_bits_left = 0;

  946.         break;

  947.     }

  948. }

  949. 

  950. static int read_sbr_single_channel_element(AACContext *ac,

  951.                                             SpectralBandReplication *sbr,

  952.                                             GetBitContext *gb)

  953. {

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

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

  956. 

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

  958.         return -1;

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

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

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

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

  963. 

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

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

  966. 

  967.     return 0;

  968. }

  969. 

  970. static int read_sbr_channel_pair_element(AACContext *ac,

  971.                                           SpectralBandReplication *sbr,

  972.                                           GetBitContext *gb)

  973. {

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

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

  976. 

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

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

  979.             return -1;

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

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

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

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

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

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

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

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

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

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

  990.     } else {

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

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

  993.             return -1;

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

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

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

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

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

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

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

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

  1002.     }

  1003. 

  1004.     if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))

  1005.         get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);

  1006.     if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))

  1007.         get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);

  1008. 

  1009.     return 0;

  1010. }

  1011. 

  1012. static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,

  1013.                                   GetBitContext *gb, int id_aac)

  1014. {

  1015.     unsigned int cnt = get_bits_count(gb);

  1016. 

  1017.     if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {

  1018.         if (read_sbr_single_channel_element(ac, sbr, gb)) {

  1019.             sbr_turnoff(sbr);

  1020.             return get_bits_count(gb) - cnt;

  1021.         }

  1022.     } else if (id_aac == TYPE_CPE) {

  1023.         if (read_sbr_channel_pair_element(ac, sbr, gb)) {

  1024.             sbr_turnoff(sbr);

  1025.             return get_bits_count(gb) - cnt;

  1026.         }

  1027.     } else {

  1028.         av_log(ac->avctx, AV_LOG_ERROR,

  1029.             "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);

  1030.         sbr_turnoff(sbr);

  1031.         return get_bits_count(gb) - cnt;

  1032.     }

  1033.     if (get_bits1(gb)) { // bs_extended_data

  1034.         int num_bits_left = get_bits(gb, 4); // bs_extension_size

  1035.         if (num_bits_left == 15)

  1036.             num_bits_left += get_bits(gb, 8); // bs_esc_count

  1037. 

  1038.         num_bits_left <<= 3;

  1039.         while (num_bits_left > 7) {

  1040.             num_bits_left -= 2;

  1041.             read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id

  1042.         }

  1043.         if (num_bits_left < 0) {

  1044.             av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");

  1045.         }

  1046.         if (num_bits_left > 0)

  1047.             skip_bits(gb, num_bits_left);

  1048.     }

  1049. 

  1050.     return get_bits_count(gb) - cnt;

  1051. }

  1052. 

  1053. static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)

  1054. {

  1055.     int err;

  1056.     err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);

  1057.     if (err >= 0)

  1058.         err = sbr_make_f_derived(ac, sbr);

  1059.     if (err < 0) {

  1060.         av_log(ac->avctx, AV_LOG_ERROR,

  1061.                "SBR reset failed. Switching SBR to pure upsampling mode.\n");

  1062.         sbr_turnoff(sbr);

  1063.     }

  1064. }

  1065. 

  1066. /**

  1067.  * Decode Spectral Band Replication extension data; reference: table 4.55.

  1068.  *

  1069.  * @param   crc flag indicating the presence of CRC checksum

  1070.  * @param   cnt length of TYPE_FIL syntactic element in bytes

  1071.  *

  1072.  * @return  Returns number of bytes consumed from the TYPE_FIL element.

  1073.  */

  1074. int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,

  1075.                             GetBitContext *gb_host, int crc, int cnt, int id_aac)

  1076. {

  1077.     unsigned int num_sbr_bits = 0, num_align_bits;

  1078.     unsigned bytes_read;

  1079.     GetBitContext gbc = *gb_host, *gb = &gbc;

  1080.     skip_bits_long(gb_host, cnt*8 - 4);

  1081. 

  1082.     sbr->reset = 0;

  1083. 

  1084.     if (!sbr->sample_rate)

  1085.         sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support

  1086.     if (!ac->oc[1].m4ac.ext_sample_rate)

  1087.         ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;

  1088. 

  1089.     if (crc) {

  1090.         skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check

  1091.         num_sbr_bits += 10;

  1092.     }

  1093. 

  1094.     //Save some state from the previous frame.

  1095.     sbr->kx[0] = sbr->kx[1];

  1096.     sbr->m[0] = sbr->m[1];

  1097.     sbr->kx_and_m_pushed = 1;

  1098. 

  1099.     num_sbr_bits++;

  1100.     if (get_bits1(gb)) // bs_header_flag

  1101.         num_sbr_bits += read_sbr_header(sbr, gb);

  1102. 

  1103.     if (sbr->reset)

  1104.         sbr_reset(ac, sbr);

  1105. 

  1106.     if (sbr->start)

  1107.         num_sbr_bits  += read_sbr_data(ac, sbr, gb, id_aac);

  1108. 

  1109.     num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;

  1110.     bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);

  1111. 

  1112.     if (bytes_read > cnt) {

  1113.         av_log(ac->avctx, AV_LOG_ERROR,

  1114.                "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);

  1115.     }

  1116.     return cnt;

  1117. }

  1118. 

  1119. /// Dequantization and stereo decoding (14496-3 sp04 p203)

  1120. static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)

  1121. {

  1122.     int k, e;

  1123.     int ch;

  1124. 

  1125.     if (id_aac == TYPE_CPE && sbr->bs_coupling) {

  1126.         float alpha      = sbr->data[0].bs_amp_res ?  1.0f :  0.5f;

  1127.         float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;

  1128.         for (e = 1; e <= sbr->data[0].bs_num_env; e++) {

  1129.             for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {

  1130.                 float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);

  1131.                 float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);

  1132.                 float fac   = temp1 / (1.0f + temp2);

  1133.                 sbr->data[0].env_facs[e][k] = fac;

  1134.                 sbr->data[1].env_facs[e][k] = fac * temp2;

  1135.             }

  1136.         }

  1137.         for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {

  1138.             for (k = 0; k < sbr->n_q; k++) {

  1139.                 float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);

  1140.                 float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);

  1141.                 float fac   = temp1 / (1.0f + temp2);

  1142.                 sbr->data[0].noise_facs[e][k] = fac;

  1143.                 sbr->data[1].noise_facs[e][k] = fac * temp2;

  1144.             }

  1145.         }

  1146.     } else { // SCE or one non-coupled CPE

  1147.         for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {

  1148.             float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;

  1149.             for (e = 1; e <= sbr->data[ch].bs_num_env; e++)

  1150.                 for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)

  1151.                     sbr->data[ch].env_facs[e][k] =

  1152.                         exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);

  1153.             for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)

  1154.                 for (k = 0; k < sbr->n_q; k++)

  1155.                     sbr->data[ch].noise_facs[e][k] =

  1156.                         exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);

  1157.         }

  1158.     }

  1159. }

  1160. 

  1161. /**

  1162.  * Analysis QMF Bank (14496-3 sp04 p206)

  1163.  *

  1164.  * @param   x       pointer to the beginning of the first sample window

  1165.  * @param   W       array of complex-valued samples split into subbands

  1166.  */

  1167. #ifndef sbr_qmf_analysis

  1168. static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,

  1169.                              SBRDSPContext *sbrdsp, const float *in, float *x,

  1170.                              float z[320], float W[2][32][32][2], int buf_idx)

  1171. {

  1172.     int i;

  1173.     memcpy(x    , x+1024, (320-32)*sizeof(x[0]));

  1174.     memcpy(x+288, in,         1024*sizeof(x[0]));

  1175.     for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames

  1176.                                // are not supported

  1177.         dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);

  1178.         sbrdsp->sum64x5(z);

  1179.         sbrdsp->qmf_pre_shuffle(z);

  1180.         mdct->imdct_half(mdct, z, z+64);

  1181.         sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);

  1182.         x += 32;

  1183.     }

  1184. }

  1185. #endif

  1186. 

  1187. /**

  1188.  * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank

  1189.  * (14496-3 sp04 p206)

  1190.  */

  1191. #ifndef sbr_qmf_synthesis

  1192. static void sbr_qmf_synthesis(FFTContext *mdct,

  1193.                               SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,

  1194.                               float *out, float X[2][38][64],

  1195.                               float mdct_buf[2][64],

  1196.                               float *v0, int *v_off, const unsigned int div)

  1197. {

  1198.     int i, n;

  1199.     const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;

  1200.     const int step = 128 >> div;

  1201.     float *v;

  1202.     for (i = 0; i < 32; i++) {

  1203.         if (*v_off < step) {

  1204.             int saved_samples = (1280 - 128) >> div;

  1205.             memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));

  1206.             *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;

  1207.         } else {

  1208.             *v_off -= step;

  1209.         }

  1210.         v = v0 + *v_off;

  1211.         if (div) {

  1212.             for (n = 0; n < 32; n++) {

  1213.                 X[0][i][   n] = -X[0][i][n];

  1214.                 X[0][i][32+n] =  X[1][i][31-n];

  1215.             }

  1216.             mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

  1217.             sbrdsp->qmf_deint_neg(v, mdct_buf[0]);

  1218.         } else {

  1219.             sbrdsp->neg_odd_64(X[1][i]);

  1220.             mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);

  1221.             mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);

  1222.             sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);

  1223.         }

  1224.         dsp->vector_fmul    (out, v                , sbr_qmf_window                       , 64 >> div);

  1225.         dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out   , 64 >> div);

  1226.         dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out   , 64 >> div);

  1227.         dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out   , 64 >> div);

  1228.         dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out   , 64 >> div);

  1229.         dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out   , 64 >> div);

  1230.         dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out   , 64 >> div);

  1231.         dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out   , 64 >> div);

  1232.         dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out   , 64 >> div);

  1233.         dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out   , 64 >> div);

  1234.         out += 64 >> div;

  1235.     }

  1236. }

  1237. #endif

  1238. 

  1239. /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering

  1240.  * (14496-3 sp04 p214)

  1241.  * Warning: This routine does not seem numerically stable.

  1242.  */

  1243. static void sbr_hf_inverse_filter(SBRDSPContext *dsp,

  1244.                                   float (*alpha0)[2], float (*alpha1)[2],

  1245.                                   const float X_low[32][40][2], int k0)

  1246. {

  1247.     int k;

  1248.     for (k = 0; k < k0; k++) {

  1249.         LOCAL_ALIGNED_16(float, phi, [3], [2][2]);

  1250.         float dk;

  1251. 

  1252.         dsp->autocorrelate(X_low[k], phi);

  1253. 

  1254.         dk =  phi[2][1][0] * phi[1][0][0] -

  1255.              (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;

  1256. 

  1257.         if (!dk) {

  1258.             alpha1[k][0] = 0;

  1259.             alpha1[k][1] = 0;

  1260.         } else {

  1261.             float temp_real, temp_im;

  1262.             temp_real = phi[0][0][0] * phi[1][1][0] -

  1263.                         phi[0][0][1] * phi[1][1][1] -

  1264.                         phi[0][1][0] * phi[1][0][0];

  1265.             temp_im   = phi[0][0][0] * phi[1][1][1] +

  1266.                         phi[0][0][1] * phi[1][1][0] -

  1267.                         phi[0][1][1] * phi[1][0][0];

  1268. 

  1269.             alpha1[k][0] = temp_real / dk;

  1270.             alpha1[k][1] = temp_im   / dk;

  1271.         }

  1272. 

  1273.         if (!phi[1][0][0]) {

  1274.             alpha0[k][0] = 0;

  1275.             alpha0[k][1] = 0;

  1276.         } else {

  1277.             float temp_real, temp_im;

  1278.             temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +

  1279.                                        alpha1[k][1] * phi[1][1][1];

  1280.             temp_im   = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -

  1281.                                        alpha1[k][0] * phi[1][1][1];

  1282. 

  1283.             alpha0[k][0] = -temp_real / phi[1][0][0];

  1284.             alpha0[k][1] = -temp_im   / phi[1][0][0];

  1285.         }

  1286. 

  1287.         if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||

  1288.            alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {

  1289.             alpha1[k][0] = 0;

  1290.             alpha1[k][1] = 0;

  1291.             alpha0[k][0] = 0;

  1292.             alpha0[k][1] = 0;

  1293.         }

  1294.     }

  1295. }

  1296. 

  1297. /// Chirp Factors (14496-3 sp04 p214)

  1298. static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)

  1299. {

  1300.     int i;

  1301.     float new_bw;

  1302.     static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };

  1303. 

  1304.     for (i = 0; i < sbr->n_q; i++) {

  1305.         if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {

  1306.             new_bw = 0.6f;

  1307.         } else

  1308.             new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];

  1309. 

  1310.         if (new_bw < ch_data->bw_array[i]) {

  1311.             new_bw = 0.75f    * new_bw + 0.25f    * ch_data->bw_array[i];

  1312.         } else

  1313.             new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];

  1314.         ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;

  1315.     }

  1316. }

  1317. 

  1318. /// Generate the subband filtered lowband

  1319. static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,

  1320.                       float X_low[32][40][2], const float W[2][32][32][2],

  1321.                       int buf_idx)

  1322. {

  1323.     int i, k;

  1324.     const int t_HFGen = 8;

  1325.     const int i_f = 32;

  1326.     memset(X_low, 0, 32*sizeof(*X_low));

  1327.     for (k = 0; k < sbr->kx[1]; k++) {

  1328.         for (i = t_HFGen; i < i_f + t_HFGen; i++) {

  1329.             X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];

  1330.             X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];

  1331.         }

  1332.     }

  1333.     buf_idx = 1-buf_idx;

  1334.     for (k = 0; k < sbr->kx[0]; k++) {

  1335.         for (i = 0; i < t_HFGen; i++) {

  1336.             X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];

  1337.             X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];

  1338.         }

  1339.     }

  1340.     return 0;

  1341. }

  1342. 

  1343. /// High Frequency Generator (14496-3 sp04 p215)

  1344. static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,

  1345.                       float X_high[64][40][2], const float X_low[32][40][2],

  1346.                       const float (*alpha0)[2], const float (*alpha1)[2],

  1347.                       const float bw_array[5], const uint8_t *t_env,

  1348.                       int bs_num_env)

  1349. {

  1350.     int j, x;

  1351.     int g = 0;

  1352.     int k = sbr->kx[1];

  1353.     for (j = 0; j < sbr->num_patches; j++) {

  1354.         for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {

  1355.             const int p = sbr->patch_start_subband[j] + x;

  1356.             while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])

  1357.                 g++;

  1358.             g--;

  1359. 

  1360.             if (g < 0) {

  1361.                 av_log(ac->avctx, AV_LOG_ERROR,

  1362.                        "ERROR : no subband found for frequency %d\n", k);

  1363.                 return -1;

  1364.             }

  1365. 

  1366.             sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,

  1367.                             X_low[p]  + ENVELOPE_ADJUSTMENT_OFFSET,

  1368.                             alpha0[p], alpha1[p], bw_array[g],

  1369.                             2 * t_env[0], 2 * t_env[bs_num_env]);

  1370.         }

  1371.     }

  1372.     if (k < sbr->m[1] + sbr->kx[1])

  1373.         memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));

  1374. 

  1375.     return 0;

  1376. }

  1377. 

  1378. /// Generate the subband filtered lowband

  1379. static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],

  1380.                      const float Y0[38][64][2], const float Y1[38][64][2],

  1381.                      const float X_low[32][40][2], int ch)

  1382. {

  1383.     int k, i;

  1384.     const int i_f = 32;

  1385.     const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);

  1386.     memset(X, 0, 2*sizeof(*X));

  1387.     for (k = 0; k < sbr->kx[0]; k++) {

  1388.         for (i = 0; i < i_Temp; i++) {

  1389.             X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

  1390.             X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

  1391.         }

  1392.     }

  1393.     for (; k < sbr->kx[0] + sbr->m[0]; k++) {

  1394.         for (i = 0; i < i_Temp; i++) {

  1395.             X[0][i][k] = Y0[i + i_f][k][0];

  1396.             X[1][i][k] = Y0[i + i_f][k][1];

  1397.         }

  1398.     }

  1399. 

  1400.     for (k = 0; k < sbr->kx[1]; k++) {

  1401.         for (i = i_Temp; i < 38; i++) {

  1402.             X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];

  1403.             X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];

  1404.         }

  1405.     }

  1406.     for (; k < sbr->kx[1] + sbr->m[1]; k++) {

  1407.         for (i = i_Temp; i < i_f; i++) {

  1408.             X[0][i][k] = Y1[i][k][0];

  1409.             X[1][i][k] = Y1[i][k][1];

  1410.         }

  1411.     }

  1412.     return 0;

  1413. }

  1414. 

  1415. /** High Frequency Adjustment (14496-3 sp04 p217) and Mapping

  1416.  * (14496-3 sp04 p217)

  1417.  */

  1418. static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,

  1419.                         SBRData *ch_data, int e_a[2])

  1420. {

  1421.     int e, i, m;

  1422. 

  1423.     memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));

  1424.     for (e = 0; e < ch_data->bs_num_env; e++) {

  1425.         const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];

  1426.         uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

  1427.         int k;

  1428. 

  1429.         if (sbr->kx[1] != table[0]) {

  1430.             av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "

  1431.                    "Derived frequency tables were not regenerated.\n");

  1432.             sbr_turnoff(sbr);

  1433.             return AVERROR_BUG;

  1434.         }

  1435.         for (i = 0; i < ilim; i++)

  1436.             for (m = table[i]; m < table[i + 1]; m++)

  1437.                 sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];

  1438. 

  1439.         // ch_data->bs_num_noise > 1 => 2 noise floors

  1440.         k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);

  1441.         for (i = 0; i < sbr->n_q; i++)

  1442.             for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)

  1443.                 sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];

  1444. 

  1445.         for (i = 0; i < sbr->n[1]; i++) {

  1446.             if (ch_data->bs_add_harmonic_flag) {

  1447.                 const unsigned int m_midpoint =

  1448.                     (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;

  1449. 

  1450.                 ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *

  1451.                     (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));

  1452.             }

  1453.         }

  1454. 

  1455.         for (i = 0; i < ilim; i++) {

  1456.             int additional_sinusoid_present = 0;

  1457.             for (m = table[i]; m < table[i + 1]; m++) {

  1458.                 if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {

  1459.                     additional_sinusoid_present = 1;

  1460.                     break;

  1461.                 }

  1462.             }

  1463.             memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,

  1464.                    (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));

  1465.         }

  1466.     }

  1467. 

  1468.     memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));

  1469.     return 0;

  1470. }

  1471. 

  1472. /// Estimation of current envelope (14496-3 sp04 p218)

  1473. static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],

  1474.                              SpectralBandReplication *sbr, SBRData *ch_data)

  1475. {

  1476.     int e, m;

  1477.     int kx1 = sbr->kx[1];

  1478. 

  1479.     if (sbr->bs_interpol_freq) {

  1480.         for (e = 0; e < ch_data->bs_num_env; e++) {

  1481.             const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);

  1482.             int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1483.             int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1484. 

  1485.             for (m = 0; m < sbr->m[1]; m++) {

  1486.                 float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);

  1487.                 e_curr[e][m] = sum * recip_env_size;

  1488.             }

  1489.         }

  1490.     } else {

  1491.         int k, p;

  1492. 

  1493.         for (e = 0; e < ch_data->bs_num_env; e++) {

  1494.             const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);

  1495.             int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1496.             int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;

  1497.             const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;

  1498. 

  1499.             for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {

  1500.                 float sum = 0.0f;

  1501.                 const int den = env_size * (table[p + 1] - table[p]);

  1502. 

  1503.                 for (k = table[p]; k < table[p + 1]; k++) {

  1504.                     sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);

  1505.                 }

  1506.                 sum /= den;

  1507.                 for (k = table[p]; k < table[p + 1]; k++) {

  1508.                     e_curr[e][k - kx1] = sum;

  1509.                 }

  1510.             }

  1511.         }

  1512.     }

  1513. }

  1514. 

  1515. /**

  1516.  * Calculation of levels of additional HF signal components (14496-3 sp04 p219)

  1517.  * and Calculation of gain (14496-3 sp04 p219)

  1518.  */

  1519. static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,

  1520.                           SBRData *ch_data, const int e_a[2])

  1521. {

  1522.     int e, k, m;

  1523.     // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)

  1524.     static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };

  1525. 

  1526.     for (e = 0; e < ch_data->bs_num_env; e++) {

  1527.         int delta = !((e == e_a[1]) || (e == e_a[0]));

  1528.         for (k = 0; k < sbr->n_lim; k++) {

  1529.             float gain_boost, gain_max;

  1530.             float sum[2] = { 0.0f, 0.0f };

  1531.             for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

  1532.                 const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);

  1533.                 sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);

  1534.                 sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);

  1535.                 if (!sbr->s_mapped[e][m]) {

  1536.                     sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /

  1537.                                             ((1.0f + sbr->e_curr[e][m]) *

  1538.                                              (1.0f + sbr->q_mapped[e][m] * delta)));

  1539.                 } else {

  1540.                     sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /

  1541.                                             ((1.0f + sbr->e_curr[e][m]) *

  1542.                                              (1.0f + sbr->q_mapped[e][m])));

  1543.                 }

  1544.             }

  1545.             for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

  1546.                 sum[0] += sbr->e_origmapped[e][m];

  1547.                 sum[1] += sbr->e_curr[e][m];

  1548.             }

  1549.             gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));

  1550.             gain_max = FFMIN(100000.f, gain_max);

  1551.             for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

  1552.                 float q_m_max   = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];

  1553.                 sbr->q_m[e][m]  = FFMIN(sbr->q_m[e][m], q_m_max);

  1554.                 sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);

  1555.             }

  1556.             sum[0] = sum[1] = 0.0f;

  1557.             for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

  1558.                 sum[0] += sbr->e_origmapped[e][m];

  1559.                 sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]

  1560.                           + sbr->s_m[e][m] * sbr->s_m[e][m]

  1561.                           + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];

  1562.             }

  1563.             gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));

  1564.             gain_boost = FFMIN(1.584893192f, gain_boost);

  1565.             for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {

  1566.                 sbr->gain[e][m] *= gain_boost;

  1567.                 sbr->q_m[e][m]  *= gain_boost;

  1568.                 sbr->s_m[e][m]  *= gain_boost;

  1569.             }

  1570.         }

  1571.     }

  1572. }

  1573. 

  1574. /// Assembling HF Signals (14496-3 sp04 p220)

  1575. static void sbr_hf_assemble(float Y1[38][64][2],

  1576.                             const float X_high[64][40][2],

  1577.                             SpectralBandReplication *sbr, SBRData *ch_data,

  1578.                             const int e_a[2])

  1579. {

  1580.     int e, i, j, m;

  1581.     const int h_SL = 4 * !sbr->bs_smoothing_mode;

  1582.     const int kx = sbr->kx[1];

  1583.     const int m_max = sbr->m[1];

  1584.     static const float h_smooth[5] = {

  1585.         0.33333333333333,

  1586.         0.30150283239582,

  1587.         0.21816949906249,

  1588.         0.11516383427084,

  1589.         0.03183050093751,

  1590.     };

  1591.     float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;

  1592.     int indexnoise = ch_data->f_indexnoise;

  1593.     int indexsine  = ch_data->f_indexsine;

  1594. 

  1595.     if (sbr->reset) {

  1596.         for (i = 0; i < h_SL; i++) {

  1597.             memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));

  1598.             memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0],  m_max * sizeof(sbr->q_m[0][0]));

  1599.         }

  1600.     } else if (h_SL) {

  1601.         memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));

  1602.         memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));

  1603.     }

  1604. 

  1605.     for (e = 0; e < ch_data->bs_num_env; e++) {

  1606.         for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {

  1607.             memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));

  1608.             memcpy(q_temp[h_SL + i], sbr->q_m[e],  m_max * sizeof(sbr->q_m[0][0]));

  1609.         }

  1610.     }

  1611. 

  1612.     for (e = 0; e < ch_data->bs_num_env; e++) {

  1613.         for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {

  1614.             LOCAL_ALIGNED_16(float, g_filt_tab, [48]);

  1615.             LOCAL_ALIGNED_16(float, q_filt_tab, [48]);

  1616.             float *g_filt, *q_filt;

  1617. 

  1618.             if (h_SL && e != e_a[0] && e != e_a[1]) {

  1619.                 g_filt = g_filt_tab;

  1620.                 q_filt = q_filt_tab;

  1621.                 for (m = 0; m < m_max; m++) {

  1622.                     const int idx1 = i + h_SL;

  1623.                     g_filt[m] = 0.0f;

  1624.                     q_filt[m] = 0.0f;

  1625.                     for (j = 0; j <= h_SL; j++) {

  1626.                         g_filt[m] += g_temp[idx1 - j][m] * h_smooth[j];

  1627.                         q_filt[m] += q_temp[idx1 - j][m] * h_smooth[j];

  1628.                     }

  1629.                 }

  1630.             } else {

  1631.                 g_filt = g_temp[i + h_SL];

  1632.                 q_filt = q_temp[i];

  1633.             }

  1634. 

  1635.             sbr->dsp.hf_g_filt(Y1[i] + kx, X_high + kx, g_filt, m_max,

  1636.                                i + ENVELOPE_ADJUSTMENT_OFFSET);

  1637. 

  1638.             if (e != e_a[0] && e != e_a[1]) {

  1639.                 sbr->dsp.hf_apply_noise[indexsine](Y1[i] + kx, sbr->s_m[e],

  1640.                                                    q_filt, indexnoise,

  1641.                                                    kx, m_max);

  1642.             } else {

  1643.                 int idx = indexsine&1;

  1644.                 int A = (1-((indexsine+(kx & 1))&2));

  1645.                 int B = (A^(-idx)) + idx;

  1646.                 float *out = &Y1[i][kx][idx];

  1647.                 float *in  = sbr->s_m[e];

  1648.                 for (m = 0; m+1 < m_max; m+=2) {

  1649.                     out[2*m  ] += in[m  ] * A;

  1650.                     out[2*m+2] += in[m+1] * B;

  1651.                 }

  1652.                 if(m_max&1)

  1653.                     out[2*m  ] += in[m  ] * A;

  1654.             }

  1655.             indexnoise = (indexnoise + m_max) & 0x1ff;

  1656.             indexsine = (indexsine + 1) & 3;

  1657.         }

  1658.     }

  1659.     ch_data->f_indexnoise = indexnoise;

  1660.     ch_data->f_indexsine  = indexsine;

  1661. }

  1662. 

  1663. void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,

  1664.                   float* L, float* R)

  1665. {

  1666.     int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;

  1667.     int ch;

  1668.     int nch = (id_aac == TYPE_CPE) ? 2 : 1;

  1669.     int err;

  1670. 

  1671.     if (!sbr->kx_and_m_pushed) {

  1672.         sbr->kx[0] = sbr->kx[1];

  1673.         sbr->m[0] = sbr->m[1];

  1674.     } else {

  1675.         sbr->kx_and_m_pushed = 0;

  1676.     }

  1677. 

  1678.     if (sbr->start) {

  1679.         sbr_dequant(sbr, id_aac);

  1680.     }

  1681.     for (ch = 0; ch < nch; ch++) {

  1682.         /* decode channel */

  1683.         sbr_qmf_analysis(&ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,

  1684.                          (float*)sbr->qmf_filter_scratch,

  1685.                          sbr->data[ch].W, sbr->data[ch].Ypos);

  1686.         sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W, sbr->data[ch].Ypos);

  1687.         sbr->data[ch].Ypos ^= 1;

  1688.         if (sbr->start) {

  1689.             sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);

  1690.             sbr_chirp(sbr, &sbr->data[ch]);

  1691.             sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,

  1692.                        sbr->data[ch].bw_array, sbr->data[ch].t_env,

  1693.                        sbr->data[ch].bs_num_env);

  1694. 

  1695.             // hf_adj

  1696.             err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

  1697.             if (!err) {

  1698.                 sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);

  1699.                 sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);

  1700.                 sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],

  1701.                                 sbr->X_high, sbr, &sbr->data[ch],

  1702.                                 sbr->data[ch].e_a);

  1703.             }

  1704.         }

  1705. 

  1706.         /* synthesis */

  1707.         sbr->c.sbr_x_gen(sbr, sbr->X[ch],

  1708.                   sbr->data[ch].Y[1-sbr->data[ch].Ypos],

  1709.                   sbr->data[ch].Y[  sbr->data[ch].Ypos],

  1710.                   sbr->X_low, ch);

  1711.     }

  1712. 

  1713.     if (ac->oc[1].m4ac.ps == 1) {

  1714.         if (sbr->ps.start) {

  1715.             ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);

  1716.         } else {

  1717.             memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));

  1718.         }

  1719.         nch = 2;

  1720.     }

  1721. 

  1722.     sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,

  1723.                       L, sbr->X[0], sbr->qmf_filter_scratch,

  1724.                       sbr->data[0].synthesis_filterbank_samples,

  1725.                       &sbr->data[0].synthesis_filterbank_samples_offset,

  1726.                       downsampled);

  1727.     if (nch == 2)

  1728.         sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,

  1729.                           R, sbr->X[1], sbr->qmf_filter_scratch,

  1730.                           sbr->data[1].synthesis_filterbank_samples,

  1731.                           &sbr->data[1].synthesis_filterbank_samples_offset,

  1732.                           downsampled);

  1733. }

  1734. 

  1735. static void aacsbr_func_ptr_init(AACSBRContext *c)

  1736. {

  1737.     c->sbr_lf_gen            = sbr_lf_gen;

  1738.     c->sbr_hf_assemble       = sbr_hf_assemble;

  1739.     c->sbr_x_gen             = sbr_x_gen;

  1740.     c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;

  1741. 

  1742.     if(ARCH_MIPS)

  1743.         ff_aacsbr_func_ptr_init_mips(c);

  1744. }