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FFmpeg/libavcodec/aacps.c

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  1. /*

  2.  * MPEG-4 Parametric Stereo decoding functions

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  *

  21.  * Note: Rounding-to-nearest used unless otherwise stated

  22.  *

  23.  */

  24. 

  25. #include <stdint.h>

  26. #include "libavutil/common.h"

  27. #include "libavutil/mathematics.h"

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "aacps.h"

  31. #if USE_FIXED

  32. #include "aacps_fixed_tablegen.h"

  33. #else

  34. #include "libavutil/internal.h"

  35. #include "aacps_tablegen.h"

  36. #endif /* USE_FIXED */

  37. #include "aacpsdata.c"

  38. 

  39. #define PS_BASELINE 0  ///< Operate in Baseline PS mode

  40.                        ///< Baseline implies 10 or 20 stereo bands,

  41.                        ///< mixing mode A, and no ipd/opd

  42. 

  43. #define numQMFSlots 32 //numTimeSlots * RATE

  44. 

  45. static const int8_t num_env_tab[2][4] = {

  46.     { 0, 1, 2, 4, },

  47.     { 1, 2, 3, 4, },

  48. };

  49. 

  50. static const int8_t nr_iidicc_par_tab[] = {

  51.     10, 20, 34, 10, 20, 34,

  52. };

  53. 

  54. static const int8_t nr_iidopd_par_tab[] = {

  55.      5, 11, 17,  5, 11, 17,

  56. };

  57. 

  58. enum {

  59.     huff_iid_df1,

  60.     huff_iid_dt1,

  61.     huff_iid_df0,

  62.     huff_iid_dt0,

  63.     huff_icc_df,

  64.     huff_icc_dt,

  65.     huff_ipd_df,

  66.     huff_ipd_dt,

  67.     huff_opd_df,

  68.     huff_opd_dt,

  69. };

  70. 

  71. static const int huff_iid[] = {

  72.     huff_iid_df0,

  73.     huff_iid_df1,

  74.     huff_iid_dt0,

  75.     huff_iid_dt1,

  76. };

  77. 

  78. static VLC vlc_ps[10];

  79. 

  80. #define READ_PAR_DATA(PAR, OFFSET, MASK, ERR_CONDITION) \

  81. /** \

  82.  * Read Inter-channel Intensity Difference/Inter-Channel Coherence/ \

  83.  * Inter-channel Phase Difference/Overall Phase Difference parameters from the \

  84.  * bitstream. \

  85.  * \

  86.  * @param avctx contains the current codec context \

  87.  * @param gb    pointer to the input bitstream \

  88.  * @param ps    pointer to the Parametric Stereo context \

  89.  * @param PAR   pointer to the parameter to be read \

  90.  * @param e     envelope to decode \

  91.  * @param dt    1: time delta-coded, 0: frequency delta-coded \

  92.  */ \

  93. static int read_ ## PAR ## _data(AVCodecContext *avctx, GetBitContext *gb, PSContext *ps, \

  94.                         int8_t (*PAR)[PS_MAX_NR_IIDICC], int table_idx, int e, int dt) \

  95. { \

  96.     int b, num = ps->nr_ ## PAR ## _par; \

  97.     VLC_TYPE (*vlc_table)[2] = vlc_ps[table_idx].table; \

  98.     if (dt) { \

  99.         int e_prev = e ? e - 1 : ps->num_env_old - 1; \

  100.         e_prev = FFMAX(e_prev, 0); \

  101.         for (b = 0; b < num; b++) { \

  102.             int val = PAR[e_prev][b] + get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \

  103.             if (MASK) val &= MASK; \

  104.             PAR[e][b] = val; \

  105.             if (ERR_CONDITION) \

  106.                 goto err; \

  107.         } \

  108.     } else { \

  109.         int val = 0; \

  110.         for (b = 0; b < num; b++) { \

  111.             val += get_vlc2(gb, vlc_table, 9, 3) - OFFSET; \

  112.             if (MASK) val &= MASK; \

  113.             PAR[e][b] = val; \

  114.             if (ERR_CONDITION) \

  115.                 goto err; \

  116.         } \

  117.     } \

  118.     return 0; \

  119. err: \

  120.     av_log(avctx, AV_LOG_ERROR, "illegal "#PAR"\n"); \

  121.     return -1; \

  122. }

  123. 

  124. READ_PAR_DATA(iid,    huff_offset[table_idx],    0, FFABS(ps->iid_par[e][b]) > 7 + 8 * ps->iid_quant)

  125. READ_PAR_DATA(icc,    huff_offset[table_idx],    0, ps->icc_par[e][b] > 7U)

  126. READ_PAR_DATA(ipdopd,                      0, 0x07, 0)

  127. 

  128. static int ps_read_extension_data(GetBitContext *gb, PSContext *ps, int ps_extension_id)

  129. {

  130.     int e;

  131.     int count = get_bits_count(gb);

  132. 

  133.     if (ps_extension_id)

  134.         return 0;

  135. 

  136.     ps->enable_ipdopd = get_bits1(gb);

  137.     if (ps->enable_ipdopd) {

  138.         for (e = 0; e < ps->num_env; e++) {

  139.             int dt = get_bits1(gb);

  140.             read_ipdopd_data(NULL, gb, ps, ps->ipd_par, dt ? huff_ipd_dt : huff_ipd_df, e, dt);

  141.             dt = get_bits1(gb);

  142.             read_ipdopd_data(NULL, gb, ps, ps->opd_par, dt ? huff_opd_dt : huff_opd_df, e, dt);

  143.         }

  144.     }

  145.     skip_bits1(gb);      //reserved_ps

  146.     return get_bits_count(gb) - count;

  147. }

  148. 

  149. static void ipdopd_reset(int8_t *ipd_hist, int8_t *opd_hist)

  150. {

  151.     int i;

  152.     for (i = 0; i < PS_MAX_NR_IPDOPD; i++) {

  153.         opd_hist[i] = 0;

  154.         ipd_hist[i] = 0;

  155.     }

  156. }

  157. 

  158. int AAC_RENAME(ff_ps_read_data)(AVCodecContext *avctx, GetBitContext *gb_host, PSContext *ps, int bits_left)

  159. {

  160.     int e;

  161.     int bit_count_start = get_bits_count(gb_host);

  162.     int header;

  163.     int bits_consumed;

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

  165. 

  166.     header = get_bits1(gb);

  167.     if (header) {     //enable_ps_header

  168.         ps->enable_iid = get_bits1(gb);

  169.         if (ps->enable_iid) {

  170.             int iid_mode = get_bits(gb, 3);

  171.             if (iid_mode > 5) {

  172.                 av_log(avctx, AV_LOG_ERROR, "iid_mode %d is reserved.\n",

  173.                        iid_mode);

  174.                 goto err;

  175.             }

  176.             ps->nr_iid_par    = nr_iidicc_par_tab[iid_mode];

  177.             ps->iid_quant     = iid_mode > 2;

  178.             ps->nr_ipdopd_par = nr_iidopd_par_tab[iid_mode];

  179.         }

  180.         ps->enable_icc = get_bits1(gb);

  181.         if (ps->enable_icc) {

  182.             ps->icc_mode = get_bits(gb, 3);

  183.             if (ps->icc_mode > 5) {

  184.                 av_log(avctx, AV_LOG_ERROR, "icc_mode %d is reserved.\n",

  185.                        ps->icc_mode);

  186.                 goto err;

  187.             }

  188.             ps->nr_icc_par = nr_iidicc_par_tab[ps->icc_mode];

  189.         }

  190.         ps->enable_ext = get_bits1(gb);

  191.     }

  192. 

  193.     ps->frame_class = get_bits1(gb);

  194.     ps->num_env_old = ps->num_env;

  195.     ps->num_env     = num_env_tab[ps->frame_class][get_bits(gb, 2)];

  196. 

  197.     ps->border_position[0] = -1;

  198.     if (ps->frame_class) {

  199.         for (e = 1; e <= ps->num_env; e++)

  200.             ps->border_position[e] = get_bits(gb, 5);

  201.     } else

  202.         for (e = 1; e <= ps->num_env; e++)

  203.             ps->border_position[e] = (e * numQMFSlots >> ff_log2_tab[ps->num_env]) - 1;

  204. 

  205.     if (ps->enable_iid) {

  206.         for (e = 0; e < ps->num_env; e++) {

  207.             int dt = get_bits1(gb);

  208.             if (read_iid_data(avctx, gb, ps, ps->iid_par, huff_iid[2*dt+ps->iid_quant], e, dt))

  209.                 goto err;

  210.         }

  211.     } else

  212.         memset(ps->iid_par, 0, sizeof(ps->iid_par));

  213. 

  214.     if (ps->enable_icc)

  215.         for (e = 0; e < ps->num_env; e++) {

  216.             int dt = get_bits1(gb);

  217.             if (read_icc_data(avctx, gb, ps, ps->icc_par, dt ? huff_icc_dt : huff_icc_df, e, dt))

  218.                 goto err;

  219.         }

  220.     else

  221.         memset(ps->icc_par, 0, sizeof(ps->icc_par));

  222. 

  223.     if (ps->enable_ext) {

  224.         int cnt = get_bits(gb, 4);

  225.         if (cnt == 15) {

  226.             cnt += get_bits(gb, 8);

  227.         }

  228.         cnt *= 8;

  229.         while (cnt > 7) {

  230.             int ps_extension_id = get_bits(gb, 2);

  231.             cnt -= 2 + ps_read_extension_data(gb, ps, ps_extension_id);

  232.         }

  233.         if (cnt < 0) {

  234.             av_log(avctx, AV_LOG_ERROR, "ps extension overflow %d\n", cnt);

  235.             goto err;

  236.         }

  237.         skip_bits(gb, cnt);

  238.     }

  239. 

  240.     ps->enable_ipdopd &= !PS_BASELINE;

  241. 

  242.     //Fix up envelopes

  243.     if (!ps->num_env || ps->border_position[ps->num_env] < numQMFSlots - 1) {

  244.         //Create a fake envelope

  245.         int source = ps->num_env ? ps->num_env - 1 : ps->num_env_old - 1;

  246.         int b;

  247.         if (source >= 0 && source != ps->num_env) {

  248.             if (ps->enable_iid) {

  249.                 memcpy(ps->iid_par+ps->num_env, ps->iid_par+source, sizeof(ps->iid_par[0]));

  250.             }

  251.             if (ps->enable_icc) {

  252.                 memcpy(ps->icc_par+ps->num_env, ps->icc_par+source, sizeof(ps->icc_par[0]));

  253.             }

  254.             if (ps->enable_ipdopd) {

  255.                 memcpy(ps->ipd_par+ps->num_env, ps->ipd_par+source, sizeof(ps->ipd_par[0]));

  256.                 memcpy(ps->opd_par+ps->num_env, ps->opd_par+source, sizeof(ps->opd_par[0]));

  257.             }

  258.         }

  259.         if (ps->enable_iid){

  260.             for (b = 0; b < ps->nr_iid_par; b++) {

  261.                 if (FFABS(ps->iid_par[ps->num_env][b]) > 7 + 8 * ps->iid_quant) {

  262.                     av_log(avctx, AV_LOG_ERROR, "iid_par invalid\n");

  263.                     goto err;

  264.                 }

  265.             }

  266.         }

  267.         if (ps->enable_icc){

  268.             for (b = 0; b < ps->nr_iid_par; b++) {

  269.                 if (ps->icc_par[ps->num_env][b] > 7U) {

  270.                     av_log(avctx, AV_LOG_ERROR, "icc_par invalid\n");

  271.                     goto err;

  272.                 }

  273.             }

  274.         }

  275.         ps->num_env++;

  276.         ps->border_position[ps->num_env] = numQMFSlots - 1;

  277.     }

  278. 

  279. 

  280.     ps->is34bands_old = ps->is34bands;

  281.     if (!PS_BASELINE && (ps->enable_iid || ps->enable_icc))

  282.         ps->is34bands = (ps->enable_iid && ps->nr_iid_par == 34) ||

  283.                         (ps->enable_icc && ps->nr_icc_par == 34);

  284. 

  285.     //Baseline

  286.     if (!ps->enable_ipdopd) {

  287.         memset(ps->ipd_par, 0, sizeof(ps->ipd_par));

  288.         memset(ps->opd_par, 0, sizeof(ps->opd_par));

  289.     }

  290. 

  291.     if (header)

  292.         ps->start = 1;

  293. 

  294.     bits_consumed = get_bits_count(gb) - bit_count_start;

  295.     if (bits_consumed <= bits_left) {

  296.         skip_bits_long(gb_host, bits_consumed);

  297.         return bits_consumed;

  298.     }

  299.     av_log(avctx, AV_LOG_ERROR, "Expected to read %d PS bits actually read %d.\n", bits_left, bits_consumed);

  300. err:

  301.     ps->start = 0;

  302.     skip_bits_long(gb_host, bits_left);

  303.     memset(ps->iid_par, 0, sizeof(ps->iid_par));

  304.     memset(ps->icc_par, 0, sizeof(ps->icc_par));

  305.     memset(ps->ipd_par, 0, sizeof(ps->ipd_par));

  306.     memset(ps->opd_par, 0, sizeof(ps->opd_par));

  307.     return bits_left;

  308. }

  309. 

  310. /** Split one subband into 2 subsubbands with a symmetric real filter.

  311.  * The filter must have its non-center even coefficients equal to zero. */

  312. static void hybrid2_re(INTFLOAT (*in)[2], INTFLOAT (*out)[32][2], const INTFLOAT filter[8], int len, int reverse)

  313. {

  314.     int i, j;

  315.     for (i = 0; i < len; i++, in++) {

  316.         INT64FLOAT re_in = AAC_MUL31(filter[6], in[6][0]); //real inphase

  317.         INT64FLOAT re_op = 0.0f;                          //real out of phase

  318.         INT64FLOAT im_in = AAC_MUL31(filter[6], in[6][1]); //imag inphase

  319.         INT64FLOAT im_op = 0.0f;                          //imag out of phase

  320.         for (j = 0; j < 6; j += 2) {

  321.             re_op += (INT64FLOAT)filter[j+1] * (in[j+1][0] + in[12-j-1][0]);

  322.             im_op += (INT64FLOAT)filter[j+1] * (in[j+1][1] + in[12-j-1][1]);

  323.         }

  324. 

  325. #if USE_FIXED

  326.         re_op = (re_op + 0x40000000) >> 31;

  327.         im_op = (im_op + 0x40000000) >> 31;

  328. #endif /* USE_FIXED */

  329. 

  330.         out[ reverse][i][0] = (INTFLOAT)(re_in + re_op);

  331.         out[ reverse][i][1] = (INTFLOAT)(im_in + im_op);

  332.         out[!reverse][i][0] = (INTFLOAT)(re_in - re_op);

  333.         out[!reverse][i][1] = (INTFLOAT)(im_in - im_op);

  334.     }

  335. }

  336. 

  337. /** Split one subband into 6 subsubbands with a complex filter */

  338. static void hybrid6_cx(PSDSPContext *dsp, INTFLOAT (*in)[2], INTFLOAT (*out)[32][2],

  339.                        TABLE_CONST INTFLOAT (*filter)[8][2], int len)

  340. {

  341.     int i;

  342.     int N = 8;

  343.     LOCAL_ALIGNED_16(INTFLOAT, temp, [8], [2]);

  344. 

  345.     for (i = 0; i < len; i++, in++) {

  346.         dsp->hybrid_analysis(temp, in, (const INTFLOAT (*)[8][2]) filter, 1, N);

  347.         out[0][i][0] = temp[6][0];

  348.         out[0][i][1] = temp[6][1];

  349.         out[1][i][0] = temp[7][0];

  350.         out[1][i][1] = temp[7][1];

  351.         out[2][i][0] = temp[0][0];

  352.         out[2][i][1] = temp[0][1];

  353.         out[3][i][0] = temp[1][0];

  354.         out[3][i][1] = temp[1][1];

  355.         out[4][i][0] = temp[2][0] + temp[5][0];

  356.         out[4][i][1] = temp[2][1] + temp[5][1];

  357.         out[5][i][0] = temp[3][0] + temp[4][0];

  358.         out[5][i][1] = temp[3][1] + temp[4][1];

  359.     }

  360. }

  361. 

  362. static void hybrid4_8_12_cx(PSDSPContext *dsp,

  363.                             INTFLOAT (*in)[2], INTFLOAT (*out)[32][2],

  364.                             TABLE_CONST INTFLOAT (*filter)[8][2], int N, int len)

  365. {

  366.     int i;

  367. 

  368.     for (i = 0; i < len; i++, in++) {

  369.         dsp->hybrid_analysis(out[0] + i, in, (const INTFLOAT (*)[8][2]) filter, 32, N);

  370.     }

  371. }

  372. 

  373. static void hybrid_analysis(PSDSPContext *dsp, INTFLOAT out[91][32][2],

  374.                             INTFLOAT in[5][44][2], INTFLOAT L[2][38][64],

  375.                             int is34, int len)

  376. {

  377.     int i, j;

  378.     for (i = 0; i < 5; i++) {

  379.         for (j = 0; j < 38; j++) {

  380.             in[i][j+6][0] = L[0][j][i];

  381.             in[i][j+6][1] = L[1][j][i];

  382.         }

  383.     }

  384.     if (is34) {

  385.         hybrid4_8_12_cx(dsp, in[0], out,    f34_0_12, 12, len);

  386.         hybrid4_8_12_cx(dsp, in[1], out+12, f34_1_8,   8, len);

  387.         hybrid4_8_12_cx(dsp, in[2], out+20, f34_2_4,   4, len);

  388.         hybrid4_8_12_cx(dsp, in[3], out+24, f34_2_4,   4, len);

  389.         hybrid4_8_12_cx(dsp, in[4], out+28, f34_2_4,   4, len);

  390.         dsp->hybrid_analysis_ileave(out + 27, L, 5, len);

  391.     } else {

  392.         hybrid6_cx(dsp, in[0], out, f20_0_8, len);

  393.         hybrid2_re(in[1], out+6, g1_Q2, len, 1);

  394.         hybrid2_re(in[2], out+8, g1_Q2, len, 0);

  395.         dsp->hybrid_analysis_ileave(out + 7, L, 3, len);

  396.     }

  397.     //update in_buf

  398.     for (i = 0; i < 5; i++) {

  399.         memcpy(in[i], in[i]+32, 6 * sizeof(in[i][0]));

  400.     }

  401. }

  402. 

  403. static void hybrid_synthesis(PSDSPContext *dsp, INTFLOAT out[2][38][64],

  404.                              INTFLOAT in[91][32][2], int is34, int len)

  405. {

  406.     int i, n;

  407.     if (is34) {

  408.         for (n = 0; n < len; n++) {

  409.             memset(out[0][n], 0, 5*sizeof(out[0][n][0]));

  410.             memset(out[1][n], 0, 5*sizeof(out[1][n][0]));

  411.             for (i = 0; i < 12; i++) {

  412.                 out[0][n][0] += in[   i][n][0];

  413.                 out[1][n][0] += in[   i][n][1];

  414.             }

  415.             for (i = 0; i < 8; i++) {

  416.                 out[0][n][1] += in[12+i][n][0];

  417.                 out[1][n][1] += in[12+i][n][1];

  418.             }

  419.             for (i = 0; i < 4; i++) {

  420.                 out[0][n][2] += in[20+i][n][0];

  421.                 out[1][n][2] += in[20+i][n][1];

  422.                 out[0][n][3] += in[24+i][n][0];

  423.                 out[1][n][3] += in[24+i][n][1];

  424.                 out[0][n][4] += in[28+i][n][0];

  425.                 out[1][n][4] += in[28+i][n][1];

  426.             }

  427.         }

  428.         dsp->hybrid_synthesis_deint(out, in + 27, 5, len);

  429.     } else {

  430.         for (n = 0; n < len; n++) {

  431.             out[0][n][0] = in[0][n][0] + in[1][n][0] + in[2][n][0] +

  432.                            in[3][n][0] + in[4][n][0] + in[5][n][0];

  433.             out[1][n][0] = in[0][n][1] + in[1][n][1] + in[2][n][1] +

  434.                            in[3][n][1] + in[4][n][1] + in[5][n][1];

  435.             out[0][n][1] = in[6][n][0] + in[7][n][0];

  436.             out[1][n][1] = in[6][n][1] + in[7][n][1];

  437.             out[0][n][2] = in[8][n][0] + in[9][n][0];

  438.             out[1][n][2] = in[8][n][1] + in[9][n][1];

  439.         }

  440.         dsp->hybrid_synthesis_deint(out, in + 7, 3, len);

  441.     }

  442. }

  443. 

  444. /// All-pass filter decay slope

  445. #define DECAY_SLOPE      Q30(0.05f)

  446. /// Number of frequency bands that can be addressed by the parameter index, b(k)

  447. static const int   NR_PAR_BANDS[]      = { 20, 34 };

  448. static const int   NR_IPDOPD_BANDS[]   = { 11, 17 };

  449. /// Number of frequency bands that can be addressed by the sub subband index, k

  450. static const int   NR_BANDS[]          = { 71, 91 };

  451. /// Start frequency band for the all-pass filter decay slope

  452. static const int   DECAY_CUTOFF[]      = { 10, 32 };

  453. /// Number of all-pass filer bands

  454. static const int   NR_ALLPASS_BANDS[]  = { 30, 50 };

  455. /// First stereo band using the short one sample delay

  456. static const int   SHORT_DELAY_BAND[]  = { 42, 62 };

  457. 

  458. /** Table 8.46 */

  459. static void map_idx_10_to_20(int8_t *par_mapped, const int8_t *par, int full)

  460. {

  461.     int b;

  462.     if (full)

  463.         b = 9;

  464.     else {

  465.         b = 4;

  466.         par_mapped[10] = 0;

  467.     }

  468.     for (; b >= 0; b--) {

  469.         par_mapped[2*b+1] = par_mapped[2*b] = par[b];

  470.     }

  471. }

  472. 

  473. static void map_idx_34_to_20(int8_t *par_mapped, const int8_t *par, int full)

  474. {

  475.     par_mapped[ 0] = (2*par[ 0] +   par[ 1]) / 3;

  476.     par_mapped[ 1] = (  par[ 1] + 2*par[ 2]) / 3;

  477.     par_mapped[ 2] = (2*par[ 3] +   par[ 4]) / 3;

  478.     par_mapped[ 3] = (  par[ 4] + 2*par[ 5]) / 3;

  479.     par_mapped[ 4] = (  par[ 6] +   par[ 7]) / 2;

  480.     par_mapped[ 5] = (  par[ 8] +   par[ 9]) / 2;

  481.     par_mapped[ 6] =    par[10];

  482.     par_mapped[ 7] =    par[11];

  483.     par_mapped[ 8] = (  par[12] +   par[13]) / 2;

  484.     par_mapped[ 9] = (  par[14] +   par[15]) / 2;

  485.     par_mapped[10] =    par[16];

  486.     if (full) {

  487.         par_mapped[11] =    par[17];

  488.         par_mapped[12] =    par[18];

  489.         par_mapped[13] =    par[19];

  490.         par_mapped[14] = (  par[20] +   par[21]) / 2;

  491.         par_mapped[15] = (  par[22] +   par[23]) / 2;

  492.         par_mapped[16] = (  par[24] +   par[25]) / 2;

  493.         par_mapped[17] = (  par[26] +   par[27]) / 2;

  494.         par_mapped[18] = (  par[28] +   par[29] +   par[30] +   par[31]) / 4;

  495.         par_mapped[19] = (  par[32] +   par[33]) / 2;

  496.     }

  497. }

  498. 

  499. static void map_val_34_to_20(INTFLOAT par[PS_MAX_NR_IIDICC])

  500. {

  501. #if USE_FIXED

  502.     par[ 0] = (int)(((int64_t)(par[ 0] + (unsigned)(par[ 1]>>1)) * 1431655765 + \

  503.                       0x40000000) >> 31);

  504.     par[ 1] = (int)(((int64_t)((par[ 1]>>1) + (unsigned)par[ 2]) * 1431655765 + \

  505.                       0x40000000) >> 31);

  506.     par[ 2] = (int)(((int64_t)(par[ 3] + (unsigned)(par[ 4]>>1)) * 1431655765 + \

  507.                       0x40000000) >> 31);

  508.     par[ 3] = (int)(((int64_t)((par[ 4]>>1) + (unsigned)par[ 5]) * 1431655765 + \

  509.                       0x40000000) >> 31);

  510. #else

  511.     par[ 0] = (2*par[ 0] +   par[ 1]) * 0.33333333f;

  512.     par[ 1] = (  par[ 1] + 2*par[ 2]) * 0.33333333f;

  513.     par[ 2] = (2*par[ 3] +   par[ 4]) * 0.33333333f;

  514.     par[ 3] = (  par[ 4] + 2*par[ 5]) * 0.33333333f;

  515. #endif /* USE_FIXED */

  516.     par[ 4] = AAC_HALF_SUM(par[ 6], par[ 7]);

  517.     par[ 5] = AAC_HALF_SUM(par[ 8], par[ 9]);

  518.     par[ 6] =    par[10];

  519.     par[ 7] =    par[11];

  520.     par[ 8] = AAC_HALF_SUM(par[12], par[13]);

  521.     par[ 9] = AAC_HALF_SUM(par[14], par[15]);

  522.     par[10] =    par[16];

  523.     par[11] =    par[17];

  524.     par[12] =    par[18];

  525.     par[13] =    par[19];

  526.     par[14] = AAC_HALF_SUM(par[20], par[21]);

  527.     par[15] = AAC_HALF_SUM(par[22], par[23]);

  528.     par[16] = AAC_HALF_SUM(par[24], par[25]);

  529.     par[17] = AAC_HALF_SUM(par[26], par[27]);

  530. #if USE_FIXED

  531.     par[18] = (((par[28]+2)>>2) + ((par[29]+2)>>2) + ((par[30]+2)>>2) + ((par[31]+2)>>2));

  532. #else

  533.     par[18] = (  par[28] +   par[29] +   par[30] +   par[31]) * 0.25f;

  534. #endif /* USE_FIXED */

  535.     par[19] = AAC_HALF_SUM(par[32], par[33]);

  536. }

  537. 

  538. static void map_idx_10_to_34(int8_t *par_mapped, const int8_t *par, int full)

  539. {

  540.     if (full) {

  541.         par_mapped[33] = par[9];

  542.         par_mapped[32] = par[9];

  543.         par_mapped[31] = par[9];

  544.         par_mapped[30] = par[9];

  545.         par_mapped[29] = par[9];

  546.         par_mapped[28] = par[9];

  547.         par_mapped[27] = par[8];

  548.         par_mapped[26] = par[8];

  549.         par_mapped[25] = par[8];

  550.         par_mapped[24] = par[8];

  551.         par_mapped[23] = par[7];

  552.         par_mapped[22] = par[7];

  553.         par_mapped[21] = par[7];

  554.         par_mapped[20] = par[7];

  555.         par_mapped[19] = par[6];

  556.         par_mapped[18] = par[6];

  557.         par_mapped[17] = par[5];

  558.         par_mapped[16] = par[5];

  559.     } else {

  560.         par_mapped[16] =      0;

  561.     }

  562.     par_mapped[15] = par[4];

  563.     par_mapped[14] = par[4];

  564.     par_mapped[13] = par[4];

  565.     par_mapped[12] = par[4];

  566.     par_mapped[11] = par[3];

  567.     par_mapped[10] = par[3];

  568.     par_mapped[ 9] = par[2];

  569.     par_mapped[ 8] = par[2];

  570.     par_mapped[ 7] = par[2];

  571.     par_mapped[ 6] = par[2];

  572.     par_mapped[ 5] = par[1];

  573.     par_mapped[ 4] = par[1];

  574.     par_mapped[ 3] = par[1];

  575.     par_mapped[ 2] = par[0];

  576.     par_mapped[ 1] = par[0];

  577.     par_mapped[ 0] = par[0];

  578. }

  579. 

  580. static void map_idx_20_to_34(int8_t *par_mapped, const int8_t *par, int full)

  581. {

  582.     if (full) {

  583.         par_mapped[33] =  par[19];

  584.         par_mapped[32] =  par[19];

  585.         par_mapped[31] =  par[18];

  586.         par_mapped[30] =  par[18];

  587.         par_mapped[29] =  par[18];

  588.         par_mapped[28] =  par[18];

  589.         par_mapped[27] =  par[17];

  590.         par_mapped[26] =  par[17];

  591.         par_mapped[25] =  par[16];

  592.         par_mapped[24] =  par[16];

  593.         par_mapped[23] =  par[15];

  594.         par_mapped[22] =  par[15];

  595.         par_mapped[21] =  par[14];

  596.         par_mapped[20] =  par[14];

  597.         par_mapped[19] =  par[13];

  598.         par_mapped[18] =  par[12];

  599.         par_mapped[17] =  par[11];

  600.     }

  601.     par_mapped[16] =  par[10];

  602.     par_mapped[15] =  par[ 9];

  603.     par_mapped[14] =  par[ 9];

  604.     par_mapped[13] =  par[ 8];

  605.     par_mapped[12] =  par[ 8];

  606.     par_mapped[11] =  par[ 7];

  607.     par_mapped[10] =  par[ 6];

  608.     par_mapped[ 9] =  par[ 5];

  609.     par_mapped[ 8] =  par[ 5];

  610.     par_mapped[ 7] =  par[ 4];

  611.     par_mapped[ 6] =  par[ 4];

  612.     par_mapped[ 5] =  par[ 3];

  613.     par_mapped[ 4] = (par[ 2] + par[ 3]) / 2;

  614.     par_mapped[ 3] =  par[ 2];

  615.     par_mapped[ 2] =  par[ 1];

  616.     par_mapped[ 1] = (par[ 0] + par[ 1]) / 2;

  617.     par_mapped[ 0] =  par[ 0];

  618. }

  619. 

  620. static void map_val_20_to_34(INTFLOAT par[PS_MAX_NR_IIDICC])

  621. {

  622.     par[33] =  par[19];

  623.     par[32] =  par[19];

  624.     par[31] =  par[18];

  625.     par[30] =  par[18];

  626.     par[29] =  par[18];

  627.     par[28] =  par[18];

  628.     par[27] =  par[17];

  629.     par[26] =  par[17];

  630.     par[25] =  par[16];

  631.     par[24] =  par[16];

  632.     par[23] =  par[15];

  633.     par[22] =  par[15];

  634.     par[21] =  par[14];

  635.     par[20] =  par[14];

  636.     par[19] =  par[13];

  637.     par[18] =  par[12];

  638.     par[17] =  par[11];

  639.     par[16] =  par[10];

  640.     par[15] =  par[ 9];

  641.     par[14] =  par[ 9];

  642.     par[13] =  par[ 8];

  643.     par[12] =  par[ 8];

  644.     par[11] =  par[ 7];

  645.     par[10] =  par[ 6];

  646.     par[ 9] =  par[ 5];

  647.     par[ 8] =  par[ 5];

  648.     par[ 7] =  par[ 4];

  649.     par[ 6] =  par[ 4];

  650.     par[ 5] =  par[ 3];

  651.     par[ 4] = AAC_HALF_SUM(par[ 2], par[ 3]);

  652.     par[ 3] =  par[ 2];

  653.     par[ 2] =  par[ 1];

  654.     par[ 1] = AAC_HALF_SUM(par[ 0], par[ 1]);

  655. }

  656. 

  657. static void decorrelation(PSContext *ps, INTFLOAT (*out)[32][2], const INTFLOAT (*s)[32][2], int is34)

  658. {

  659.     LOCAL_ALIGNED_16(INTFLOAT, power, [34], [PS_QMF_TIME_SLOTS]);

  660.     LOCAL_ALIGNED_16(INTFLOAT, transient_gain, [34], [PS_QMF_TIME_SLOTS]);

  661.     INTFLOAT *peak_decay_nrg = ps->peak_decay_nrg;

  662.     INTFLOAT *power_smooth = ps->power_smooth;

  663.     INTFLOAT *peak_decay_diff_smooth = ps->peak_decay_diff_smooth;

  664.     INTFLOAT (*delay)[PS_QMF_TIME_SLOTS + PS_MAX_DELAY][2] = ps->delay;

  665.     INTFLOAT (*ap_delay)[PS_AP_LINKS][PS_QMF_TIME_SLOTS + PS_MAX_AP_DELAY][2] = ps->ap_delay;

  666. #if !USE_FIXED

  667.     const float transient_impact  = 1.5f;

  668.     const float a_smooth          = 0.25f; ///< Smoothing coefficient

  669. #endif /* USE_FIXED */

  670.     const int8_t *k_to_i = is34 ? k_to_i_34 : k_to_i_20;

  671.     int i, k, m, n;

  672.     int n0 = 0, nL = 32;

  673.     const INTFLOAT peak_decay_factor = Q31(0.76592833836465f);

  674. 

  675.     memset(power, 0, 34 * sizeof(*power));

  676. 

  677.     if (is34 != ps->is34bands_old) {

  678.         memset(ps->peak_decay_nrg,         0, sizeof(ps->peak_decay_nrg));

  679.         memset(ps->power_smooth,           0, sizeof(ps->power_smooth));

  680.         memset(ps->peak_decay_diff_smooth, 0, sizeof(ps->peak_decay_diff_smooth));

  681.         memset(ps->delay,                  0, sizeof(ps->delay));

  682.         memset(ps->ap_delay,               0, sizeof(ps->ap_delay));

  683.     }

  684. 

  685.     for (k = 0; k < NR_BANDS[is34]; k++) {

  686.         int i = k_to_i[k];

  687.         ps->dsp.add_squares(power[i], s[k], nL - n0);

  688.     }

  689. 

  690.     //Transient detection

  691. #if USE_FIXED

  692.     for (i = 0; i < NR_PAR_BANDS[is34]; i++) {

  693.         for (n = n0; n < nL; n++) {

  694.             int decayed_peak;

  695.             decayed_peak = (int)(((int64_t)peak_decay_factor * \

  696.                                            peak_decay_nrg[i] + 0x40000000) >> 31);

  697.             peak_decay_nrg[i] = FFMAX(decayed_peak, power[i][n]);

  698.             power_smooth[i] += (power[i][n] + 2LL - power_smooth[i]) >> 2;

  699.             peak_decay_diff_smooth[i] += (peak_decay_nrg[i] + 2LL - power[i][n] - \

  700.                                           peak_decay_diff_smooth[i]) >> 2;

  701. 

  702.             if (peak_decay_diff_smooth[i]) {

  703.                 transient_gain[i][n] = FFMIN(power_smooth[i]*43691LL / peak_decay_diff_smooth[i], 1<<16);

  704.             } else

  705.                 transient_gain[i][n] = 1 << 16;

  706.         }

  707.     }

  708. #else

  709.     for (i = 0; i < NR_PAR_BANDS[is34]; i++) {

  710.         for (n = n0; n < nL; n++) {

  711.             float decayed_peak = peak_decay_factor * peak_decay_nrg[i];

  712.             float denom;

  713.             peak_decay_nrg[i] = FFMAX(decayed_peak, power[i][n]);

  714.             power_smooth[i] += a_smooth * (power[i][n] - power_smooth[i]);

  715.             peak_decay_diff_smooth[i] += a_smooth * (peak_decay_nrg[i] - power[i][n] - peak_decay_diff_smooth[i]);

  716.             denom = transient_impact * peak_decay_diff_smooth[i];

  717.             transient_gain[i][n]   = (denom > power_smooth[i]) ?

  718.                                          power_smooth[i] / denom : 1.0f;

  719.         }

  720.     }

  721. 

  722. #endif /* USE_FIXED */

  723.     //Decorrelation and transient reduction

  724.     //                         PS_AP_LINKS - 1

  725.     //                               -----

  726.     //                                | |  Q_fract_allpass[k][m]*z^-link_delay[m] - a[m]*g_decay_slope[k]

  727.     //H[k][z] = z^-2 * phi_fract[k] * | | ----------------------------------------------------------------

  728.     //                                | | 1 - a[m]*g_decay_slope[k]*Q_fract_allpass[k][m]*z^-link_delay[m]

  729.     //                               m = 0

  730.     //d[k][z] (out) = transient_gain_mapped[k][z] * H[k][z] * s[k][z]

  731.     for (k = 0; k < NR_ALLPASS_BANDS[is34]; k++) {

  732.         int b = k_to_i[k];

  733. #if USE_FIXED

  734.         int g_decay_slope;

  735. 

  736.         if (k - DECAY_CUTOFF[is34] <= 0) {

  737.           g_decay_slope = 1 << 30;

  738.         }

  739.         else if (k - DECAY_CUTOFF[is34] >= 20) {

  740.           g_decay_slope = 0;

  741.         }

  742.         else {

  743.           g_decay_slope = (1 << 30) - DECAY_SLOPE * (k - DECAY_CUTOFF[is34]);

  744.         }

  745. #else

  746.         float g_decay_slope = 1.f - DECAY_SLOPE * (k - DECAY_CUTOFF[is34]);

  747.         g_decay_slope = av_clipf(g_decay_slope, 0.f, 1.f);

  748. #endif /* USE_FIXED */

  749.         memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));

  750.         memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));

  751.         for (m = 0; m < PS_AP_LINKS; m++) {

  752.             memcpy(ap_delay[k][m],   ap_delay[k][m]+numQMFSlots,           5*sizeof(ap_delay[k][m][0]));

  753.         }

  754.         ps->dsp.decorrelate(out[k], delay[k] + PS_MAX_DELAY - 2, ap_delay[k],

  755.                             phi_fract[is34][k],

  756.                             (const INTFLOAT (*)[2]) Q_fract_allpass[is34][k],

  757.                             transient_gain[b], g_decay_slope, nL - n0);

  758.     }

  759.     for (; k < SHORT_DELAY_BAND[is34]; k++) {

  760.         int i = k_to_i[k];

  761.         memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));

  762.         memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));

  763.         //H = delay 14

  764.         ps->dsp.mul_pair_single(out[k], delay[k] + PS_MAX_DELAY - 14,

  765.                                 transient_gain[i], nL - n0);

  766.     }

  767.     for (; k < NR_BANDS[is34]; k++) {

  768.         int i = k_to_i[k];

  769.         memcpy(delay[k], delay[k]+nL, PS_MAX_DELAY*sizeof(delay[k][0]));

  770.         memcpy(delay[k]+PS_MAX_DELAY, s[k], numQMFSlots*sizeof(delay[k][0]));

  771.         //H = delay 1

  772.         ps->dsp.mul_pair_single(out[k], delay[k] + PS_MAX_DELAY - 1,

  773.                                 transient_gain[i], nL - n0);

  774.     }

  775. }

  776. 

  777. static void remap34(int8_t (**p_par_mapped)[PS_MAX_NR_IIDICC],

  778.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  779.                     int num_par, int num_env, int full)

  780. {

  781.     int8_t (*par_mapped)[PS_MAX_NR_IIDICC] = *p_par_mapped;

  782.     int e;

  783.     if (num_par == 20 || num_par == 11) {

  784.         for (e = 0; e < num_env; e++) {

  785.             map_idx_20_to_34(par_mapped[e], par[e], full);

  786.         }

  787.     } else if (num_par == 10 || num_par == 5) {

  788.         for (e = 0; e < num_env; e++) {

  789.             map_idx_10_to_34(par_mapped[e], par[e], full);

  790.         }

  791.     } else {

  792.         *p_par_mapped = par;

  793.     }

  794. }

  795. 

  796. static void remap20(int8_t (**p_par_mapped)[PS_MAX_NR_IIDICC],

  797.                     int8_t           (*par)[PS_MAX_NR_IIDICC],

  798.                     int num_par, int num_env, int full)

  799. {

  800.     int8_t (*par_mapped)[PS_MAX_NR_IIDICC] = *p_par_mapped;

  801.     int e;

  802.     if (num_par == 34 || num_par == 17) {

  803.         for (e = 0; e < num_env; e++) {

  804.             map_idx_34_to_20(par_mapped[e], par[e], full);

  805.         }

  806.     } else if (num_par == 10 || num_par == 5) {

  807.         for (e = 0; e < num_env; e++) {

  808.             map_idx_10_to_20(par_mapped[e], par[e], full);

  809.         }

  810.     } else {

  811.         *p_par_mapped = par;

  812.     }

  813. }

  814. 

  815. static void stereo_processing(PSContext *ps, INTFLOAT (*l)[32][2], INTFLOAT (*r)[32][2], int is34)

  816. {

  817.     int e, b, k;

  818. 

  819.     INTFLOAT (*H11)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H11;

  820.     INTFLOAT (*H12)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H12;

  821.     INTFLOAT (*H21)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H21;

  822.     INTFLOAT (*H22)[PS_MAX_NUM_ENV+1][PS_MAX_NR_IIDICC] = ps->H22;

  823.     int8_t *opd_hist = ps->opd_hist;

  824.     int8_t *ipd_hist = ps->ipd_hist;

  825.     int8_t iid_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  826.     int8_t icc_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  827.     int8_t ipd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  828.     int8_t opd_mapped_buf[PS_MAX_NUM_ENV][PS_MAX_NR_IIDICC];

  829.     int8_t (*iid_mapped)[PS_MAX_NR_IIDICC] = iid_mapped_buf;

  830.     int8_t (*icc_mapped)[PS_MAX_NR_IIDICC] = icc_mapped_buf;

  831.     int8_t (*ipd_mapped)[PS_MAX_NR_IIDICC] = ipd_mapped_buf;

  832.     int8_t (*opd_mapped)[PS_MAX_NR_IIDICC] = opd_mapped_buf;

  833.     const int8_t *k_to_i = is34 ? k_to_i_34 : k_to_i_20;

  834.     TABLE_CONST INTFLOAT (*H_LUT)[8][4] = (PS_BASELINE || ps->icc_mode < 3) ? HA : HB;

  835. 

  836.     //Remapping

  837.     if (ps->num_env_old) {

  838.         memcpy(H11[0][0], H11[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H11[0][0][0]));

  839.         memcpy(H11[1][0], H11[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H11[1][0][0]));

  840.         memcpy(H12[0][0], H12[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H12[0][0][0]));

  841.         memcpy(H12[1][0], H12[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H12[1][0][0]));

  842.         memcpy(H21[0][0], H21[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H21[0][0][0]));

  843.         memcpy(H21[1][0], H21[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H21[1][0][0]));

  844.         memcpy(H22[0][0], H22[0][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H22[0][0][0]));

  845.         memcpy(H22[1][0], H22[1][ps->num_env_old], PS_MAX_NR_IIDICC*sizeof(H22[1][0][0]));

  846.     }

  847. 

  848.     if (is34) {

  849.         remap34(&iid_mapped, ps->iid_par, ps->nr_iid_par, ps->num_env, 1);

  850.         remap34(&icc_mapped, ps->icc_par, ps->nr_icc_par, ps->num_env, 1);

  851.         if (ps->enable_ipdopd) {

  852.             remap34(&ipd_mapped, ps->ipd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  853.             remap34(&opd_mapped, ps->opd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  854.         }

  855.         if (!ps->is34bands_old) {

  856.             map_val_20_to_34(H11[0][0]);

  857.             map_val_20_to_34(H11[1][0]);

  858.             map_val_20_to_34(H12[0][0]);

  859.             map_val_20_to_34(H12[1][0]);

  860.             map_val_20_to_34(H21[0][0]);

  861.             map_val_20_to_34(H21[1][0]);

  862.             map_val_20_to_34(H22[0][0]);

  863.             map_val_20_to_34(H22[1][0]);

  864.             ipdopd_reset(ipd_hist, opd_hist);

  865.         }

  866.     } else {

  867.         remap20(&iid_mapped, ps->iid_par, ps->nr_iid_par, ps->num_env, 1);

  868.         remap20(&icc_mapped, ps->icc_par, ps->nr_icc_par, ps->num_env, 1);

  869.         if (ps->enable_ipdopd) {

  870.             remap20(&ipd_mapped, ps->ipd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  871.             remap20(&opd_mapped, ps->opd_par, ps->nr_ipdopd_par, ps->num_env, 0);

  872.         }

  873.         if (ps->is34bands_old) {

  874.             map_val_34_to_20(H11[0][0]);

  875.             map_val_34_to_20(H11[1][0]);

  876.             map_val_34_to_20(H12[0][0]);

  877.             map_val_34_to_20(H12[1][0]);

  878.             map_val_34_to_20(H21[0][0]);

  879.             map_val_34_to_20(H21[1][0]);

  880.             map_val_34_to_20(H22[0][0]);

  881.             map_val_34_to_20(H22[1][0]);

  882.             ipdopd_reset(ipd_hist, opd_hist);

  883.         }

  884.     }

  885. 

  886.     //Mixing

  887.     for (e = 0; e < ps->num_env; e++) {

  888.         for (b = 0; b < NR_PAR_BANDS[is34]; b++) {

  889.             INTFLOAT h11, h12, h21, h22;

  890.             h11 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][0];

  891.             h12 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][1];

  892.             h21 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][2];

  893.             h22 = H_LUT[iid_mapped[e][b] + 7 + 23 * ps->iid_quant][icc_mapped[e][b]][3];

  894. 

  895.             if (!PS_BASELINE && ps->enable_ipdopd && b < NR_IPDOPD_BANDS[is34]) {

  896.                 //The spec say says to only run this smoother when enable_ipdopd

  897.                 //is set but the reference decoder appears to run it constantly

  898.                 INTFLOAT h11i, h12i, h21i, h22i;

  899.                 INTFLOAT ipd_adj_re, ipd_adj_im;

  900.                 int opd_idx = opd_hist[b] * 8 + opd_mapped[e][b];

  901.                 int ipd_idx = ipd_hist[b] * 8 + ipd_mapped[e][b];

  902.                 INTFLOAT opd_re = pd_re_smooth[opd_idx];

  903.                 INTFLOAT opd_im = pd_im_smooth[opd_idx];

  904.                 INTFLOAT ipd_re = pd_re_smooth[ipd_idx];

  905.                 INTFLOAT ipd_im = pd_im_smooth[ipd_idx];

  906.                 opd_hist[b] = opd_idx & 0x3F;

  907.                 ipd_hist[b] = ipd_idx & 0x3F;

  908. 

  909.                 ipd_adj_re = AAC_MADD30(opd_re, ipd_re, opd_im, ipd_im);

  910.                 ipd_adj_im = AAC_MSUB30(opd_im, ipd_re, opd_re, ipd_im);

  911.                 h11i = AAC_MUL30(h11,  opd_im);

  912.                 h11  = AAC_MUL30(h11,  opd_re);

  913.                 h12i = AAC_MUL30(h12,  ipd_adj_im);

  914.                 h12  = AAC_MUL30(h12,  ipd_adj_re);

  915.                 h21i = AAC_MUL30(h21,  opd_im);

  916.                 h21  = AAC_MUL30(h21,  opd_re);

  917.                 h22i = AAC_MUL30(h22,  ipd_adj_im);

  918.                 h22  = AAC_MUL30(h22,  ipd_adj_re);

  919.                 H11[1][e+1][b] = h11i;

  920.                 H12[1][e+1][b] = h12i;

  921.                 H21[1][e+1][b] = h21i;

  922.                 H22[1][e+1][b] = h22i;

  923.             }

  924.             H11[0][e+1][b] = h11;

  925.             H12[0][e+1][b] = h12;

  926.             H21[0][e+1][b] = h21;

  927.             H22[0][e+1][b] = h22;

  928.         }

  929.         for (k = 0; k < NR_BANDS[is34]; k++) {

  930.             LOCAL_ALIGNED_16(INTFLOAT, h, [2], [4]);

  931.             LOCAL_ALIGNED_16(INTFLOAT, h_step, [2], [4]);

  932.             int start = ps->border_position[e];

  933.             int stop  = ps->border_position[e+1];

  934.             INTFLOAT width = Q30(1.f) / ((stop - start) ? (stop - start) : 1);

  935. #if USE_FIXED

  936.             width = FFMIN(2U*width, INT_MAX);

  937. #endif

  938.             b = k_to_i[k];

  939.             h[0][0] = H11[0][e][b];

  940.             h[0][1] = H12[0][e][b];

  941.             h[0][2] = H21[0][e][b];

  942.             h[0][3] = H22[0][e][b];

  943.             if (!PS_BASELINE && ps->enable_ipdopd) {

  944.             //Is this necessary? ps_04_new seems unchanged

  945.             if ((is34 && k <= 13 && k >= 9) || (!is34 && k <= 1)) {

  946.                 h[1][0] = -H11[1][e][b];

  947.                 h[1][1] = -H12[1][e][b];

  948.                 h[1][2] = -H21[1][e][b];

  949.                 h[1][3] = -H22[1][e][b];

  950.             } else {

  951.                 h[1][0] = H11[1][e][b];

  952.                 h[1][1] = H12[1][e][b];

  953.                 h[1][2] = H21[1][e][b];

  954.                 h[1][3] = H22[1][e][b];

  955.             }

  956.             }

  957.             //Interpolation

  958.             h_step[0][0] = AAC_MSUB31_V3(H11[0][e+1][b], h[0][0], width);

  959.             h_step[0][1] = AAC_MSUB31_V3(H12[0][e+1][b], h[0][1], width);

  960.             h_step[0][2] = AAC_MSUB31_V3(H21[0][e+1][b], h[0][2], width);

  961.             h_step[0][3] = AAC_MSUB31_V3(H22[0][e+1][b], h[0][3], width);

  962.             if (!PS_BASELINE && ps->enable_ipdopd) {

  963.                 h_step[1][0] = AAC_MSUB31_V3(H11[1][e+1][b], h[1][0], width);

  964.                 h_step[1][1] = AAC_MSUB31_V3(H12[1][e+1][b], h[1][1], width);

  965.                 h_step[1][2] = AAC_MSUB31_V3(H21[1][e+1][b], h[1][2], width);

  966.                 h_step[1][3] = AAC_MSUB31_V3(H22[1][e+1][b], h[1][3], width);

  967.             }

  968.             ps->dsp.stereo_interpolate[!PS_BASELINE && ps->enable_ipdopd](

  969.                 l[k] + 1 + start, r[k] + 1 + start,

  970.                 h, h_step, stop - start);

  971.         }

  972.     }

  973. }

  974. 

  975. int AAC_RENAME(ff_ps_apply)(AVCodecContext *avctx, PSContext *ps, INTFLOAT L[2][38][64], INTFLOAT R[2][38][64], int top)

  976. {

  977.     INTFLOAT (*Lbuf)[32][2] = ps->Lbuf;

  978.     INTFLOAT (*Rbuf)[32][2] = ps->Rbuf;

  979.     const int len = 32;

  980.     int is34 = ps->is34bands;

  981. 

  982.     top += NR_BANDS[is34] - 64;

  983.     memset(ps->delay+top, 0, (NR_BANDS[is34] - top)*sizeof(ps->delay[0]));

  984.     if (top < NR_ALLPASS_BANDS[is34])

  985.         memset(ps->ap_delay + top, 0, (NR_ALLPASS_BANDS[is34] - top)*sizeof(ps->ap_delay[0]));

  986. 

  987.     hybrid_analysis(&ps->dsp, Lbuf, ps->in_buf, L, is34, len);

  988.     decorrelation(ps, Rbuf, (const INTFLOAT (*)[32][2]) Lbuf, is34);

  989.     stereo_processing(ps, Lbuf, Rbuf, is34);

  990.     hybrid_synthesis(&ps->dsp, L, Lbuf, is34, len);

  991.     hybrid_synthesis(&ps->dsp, R, Rbuf, is34, len);

  992. 

  993.     return 0;

  994. }

  995. 

  996. #define PS_INIT_VLC_STATIC(num, size) \

  997.     INIT_VLC_STATIC(&vlc_ps[num], 9, ps_tmp[num].table_size / ps_tmp[num].elem_size,    \

  998.                     ps_tmp[num].ps_bits, 1, 1,                                          \

  999.                     ps_tmp[num].ps_codes, ps_tmp[num].elem_size, ps_tmp[num].elem_size, \

  1000.                     size);

  1001. 

  1002. #define PS_VLC_ROW(name) \

  1003.     { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }

  1004. 

  1005. av_cold void AAC_RENAME(ff_ps_init)(void) {

  1006.     // Syntax initialization

  1007.     static const struct {

  1008.         const void *ps_codes, *ps_bits;

  1009.         const unsigned int table_size, elem_size;

  1010.     } ps_tmp[] = {

  1011.         PS_VLC_ROW(huff_iid_df1),

  1012.         PS_VLC_ROW(huff_iid_dt1),

  1013.         PS_VLC_ROW(huff_iid_df0),

  1014.         PS_VLC_ROW(huff_iid_dt0),

  1015.         PS_VLC_ROW(huff_icc_df),

  1016.         PS_VLC_ROW(huff_icc_dt),

  1017.         PS_VLC_ROW(huff_ipd_df),

  1018.         PS_VLC_ROW(huff_ipd_dt),

  1019.         PS_VLC_ROW(huff_opd_df),

  1020.         PS_VLC_ROW(huff_opd_dt),

  1021.     };

  1022. 

  1023.     PS_INIT_VLC_STATIC(0, 1544);

  1024.     PS_INIT_VLC_STATIC(1,  832);

  1025.     PS_INIT_VLC_STATIC(2, 1024);

  1026.     PS_INIT_VLC_STATIC(3, 1036);

  1027.     PS_INIT_VLC_STATIC(4,  544);

  1028.     PS_INIT_VLC_STATIC(5,  544);

  1029.     PS_INIT_VLC_STATIC(6,  512);

  1030.     PS_INIT_VLC_STATIC(7,  512);

  1031.     PS_INIT_VLC_STATIC(8,  512);

  1032.     PS_INIT_VLC_STATIC(9,  512);

  1033. 

  1034.     ps_tableinit();

  1035. }

  1036. 

  1037. av_cold void AAC_RENAME(ff_ps_ctx_init)(PSContext *ps)

  1038. {

  1039.     AAC_RENAME(ff_psdsp_init)(&ps->dsp);

  1040. }