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FFmpeg/libavcodec/on2avc.c

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  1. /*

  2.  * On2 Audio for Video Codec decoder

  3.  *

  4.  * Copyright (c) 2013 Konstantin Shishkov

  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. #include "libavutil/channel_layout.h"

  24. #include "libavutil/float_dsp.h"

  25. #include "avcodec.h"

  26. #include "bytestream.h"

  27. #include "dsputil.h"

  28. #include "fft.h"

  29. #include "get_bits.h"

  30. #include "golomb.h"

  31. #include "internal.h"

  32. #include "unary.h"

  33. 

  34. #include "on2avcdata.h"

  35. 

  36. #define ON2AVC_SUBFRAME_SIZE   1024

  37. 

  38. enum WindowTypes {

  39.     WINDOW_TYPE_LONG       = 0,

  40.     WINDOW_TYPE_LONG_STOP,

  41.     WINDOW_TYPE_LONG_START,

  42.     WINDOW_TYPE_8SHORT     = 3,

  43.     WINDOW_TYPE_EXT4,

  44.     WINDOW_TYPE_EXT5,

  45.     WINDOW_TYPE_EXT6,

  46.     WINDOW_TYPE_EXT7,

  47. };

  48. 

  49. typedef struct On2AVCContext {

  50.     AVCodecContext *avctx;

  51.     AVFloatDSPContext fdsp;

  52.     FFTContext mdct, mdct_half, mdct_small;

  53.     FFTContext fft128, fft256, fft512, fft1024;

  54.     void (*wtf)(struct On2AVCContext *ctx, float *out, float *in, int size);

  55. 

  56.     int is_av500;

  57. 

  58.     const On2AVCMode *modes;

  59.     int window_type, prev_window_type;

  60.     int num_windows, num_bands;

  61.     int bits_per_section;

  62.     const int *band_start;

  63. 

  64.     int grouping[8];

  65.     int ms_present;

  66.     int ms_info[ON2AVC_MAX_BANDS];

  67. 

  68.     int is_long;

  69. 

  70.     uint8_t band_type[ON2AVC_MAX_BANDS];

  71.     uint8_t band_run_end[ON2AVC_MAX_BANDS];

  72.     int     num_sections;

  73. 

  74.     float band_scales[ON2AVC_MAX_BANDS];

  75. 

  76.     VLC scale_diff;

  77.     VLC cb_vlc[16];

  78. 

  79.     float scale_tab[128];

  80. 

  81.     DECLARE_ALIGNED(32, float, coeffs)[2][ON2AVC_SUBFRAME_SIZE];

  82.     DECLARE_ALIGNED(32, float, delay) [2][ON2AVC_SUBFRAME_SIZE];

  83. 

  84.     DECLARE_ALIGNED(32, float, temp)     [ON2AVC_SUBFRAME_SIZE * 2];

  85.     DECLARE_ALIGNED(32, float, mdct_buf) [ON2AVC_SUBFRAME_SIZE];

  86.     DECLARE_ALIGNED(32, float, long_win) [ON2AVC_SUBFRAME_SIZE];

  87.     DECLARE_ALIGNED(32, float, short_win)[ON2AVC_SUBFRAME_SIZE / 8];

  88. } On2AVCContext;

  89. 

  90. static void on2avc_read_ms_info(On2AVCContext *c, GetBitContext *gb)

  91. {

  92.     int w, b, band_off = 0;

  93. 

  94.     c->ms_present = get_bits1(gb);

  95.     if (!c->ms_present)

  96.         return;

  97.     for (w = 0; w < c->num_windows; w++) {

  98.         if (!c->grouping[w]) {

  99.             memcpy(c->ms_info + band_off,

  100.                    c->ms_info + band_off - c->num_bands,

  101.                    c->num_bands * sizeof(*c->ms_info));

  102.             band_off += c->num_bands;

  103.             continue;

  104.         }

  105.         for (b = 0; b < c->num_bands; b++)

  106.             c->ms_info[band_off++] = get_bits1(gb);

  107.     }

  108. }

  109. 

  110. // do not see Table 17 in ISO/IEC 13818-7

  111. static int on2avc_decode_band_types(On2AVCContext *c, GetBitContext *gb)

  112. {

  113.     int bits_per_sect = c->is_long ? 5 : 3;

  114.     int esc_val = (1 << bits_per_sect) - 1;

  115.     int num_bands = c->num_bands * c->num_windows;

  116.     int band = 0, i, band_type, run_len, run;

  117. 

  118.     while (band < num_bands) {

  119.         band_type = get_bits(gb, 4);

  120.         run_len   = 1;

  121.         do {

  122.             run = get_bits(gb, bits_per_sect);

  123.             run_len += run;

  124.         } while (run == esc_val);

  125.         if (band + run_len > num_bands) {

  126.             av_log(c->avctx, AV_LOG_ERROR, "Invalid band type run\n");

  127.             return AVERROR_INVALIDDATA;

  128.         }

  129.         for (i = band; i < band + run_len; i++) {

  130.             c->band_type[i]    = band_type;

  131.             c->band_run_end[i] = band + run_len;

  132.         }

  133.         band += run_len;

  134.     }

  135. 

  136.     return 0;

  137. }

  138. 

  139. // completely not like Table 18 in ISO/IEC 13818-7

  140. // (no intensity stereo, different coding for the first coefficient)

  141. static int on2avc_decode_band_scales(On2AVCContext *c, GetBitContext *gb)

  142. {

  143.     int w, w2, b, scale, first = 1;

  144.     int band_off = 0;

  145. 

  146.     for (w = 0; w < c->num_windows; w++) {

  147.         if (!c->grouping[w]) {

  148.             memcpy(c->band_scales + band_off,

  149.                    c->band_scales + band_off - c->num_bands,

  150.                    c->num_bands * sizeof(*c->band_scales));

  151.             band_off += c->num_bands;

  152.             continue;

  153.         }

  154.         for (b = 0; b < c->num_bands; b++) {

  155.             if (!c->band_type[band_off]) {

  156.                 int all_zero = 1;

  157.                 for (w2 = w + 1; w2 < c->num_windows; w2++) {

  158.                     if (c->grouping[w2])

  159.                         break;

  160.                     if (c->band_type[w2 * c->num_bands + b]) {

  161.                         all_zero = 0;

  162.                         break;

  163.                     }

  164.                 }

  165.                 if (all_zero) {

  166.                     c->band_scales[band_off++] = 0;

  167.                     continue;

  168.                 }

  169.             }

  170.             if (first) {

  171.                 scale = get_bits(gb, 7);

  172.                 first = 0;

  173.             } else {

  174.                 scale += get_vlc2(gb, c->scale_diff.table, 9, 3) - 60;

  175.             }

  176.             if (scale < 0 || scale > 128) {

  177.                 av_log(c->avctx, AV_LOG_ERROR, "Invalid scale value %d\n",

  178.                        scale);

  179.                 return AVERROR_INVALIDDATA;

  180.             }

  181.             c->band_scales[band_off++] = c->scale_tab[scale];

  182.         }

  183.     }

  184. 

  185.     return 0;

  186. }

  187. 

  188. static inline float on2avc_scale(int v, float scale)

  189. {

  190.     return v * sqrtf(fabsf(v)) * scale;

  191. }

  192. 

  193. // spectral data is coded completely differently - there are no unsigned codebooks

  194. static int on2avc_decode_quads(On2AVCContext *c, GetBitContext *gb, float *dst,

  195.                                int dst_size, int type, float band_scale)

  196. {

  197.     int i, j, val, val1;

  198. 

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

  200.         val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);

  201. 

  202.         for (j = 0; j < 4; j++) {

  203.             val1 = sign_extend((val >> (12 - j * 4)) & 0xF, 4);

  204.             *dst++ = on2avc_scale(val1, band_scale);

  205.         }

  206.     }

  207. 

  208.     return 0;

  209. }

  210. 

  211. static inline int get_egolomb(GetBitContext *gb)

  212. {

  213.     int v = 4;

  214. 

  215.     while (get_bits1(gb)) v++;

  216. 

  217.     return (1 << v) + get_bits(gb, v);

  218. }

  219. 

  220. static int on2avc_decode_pairs(On2AVCContext *c, GetBitContext *gb, float *dst,

  221.                                int dst_size, int type, float band_scale)

  222. {

  223.     int i, val, val1, val2, sign;

  224. 

  225.     for (i = 0; i < dst_size; i += 2) {

  226.         val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);

  227. 

  228.         val1 = sign_extend(val >> 8,   8);

  229.         val2 = sign_extend(val & 0xFF, 8);

  230.         if (type == ON2AVC_ESC_CB) {

  231.             if (val1 <= -16 || val1 >= 16) {

  232.                 sign = 1 - (val1 < 0) * 2;

  233.                 val1 = sign * get_egolomb(gb);

  234.             }

  235.             if (val2 <= -16 || val2 >= 16) {

  236.                 sign = 1 - (val2 < 0) * 2;

  237.                 val2 = sign * get_egolomb(gb);

  238.             }

  239.         }

  240. 

  241.         *dst++ = on2avc_scale(val1, band_scale);

  242.         *dst++ = on2avc_scale(val2, band_scale);

  243.     }

  244. 

  245.     return 0;

  246. }

  247. 

  248. static int on2avc_read_channel_data(On2AVCContext *c, GetBitContext *gb, int ch)

  249. {

  250.     int ret;

  251.     int w, b, band_idx;

  252.     float *coeff_ptr;

  253. 

  254.     if ((ret = on2avc_decode_band_types(c, gb)) < 0)

  255.         return ret;

  256.     if ((ret = on2avc_decode_band_scales(c, gb)) < 0)

  257.         return ret;

  258. 

  259.     coeff_ptr = c->coeffs[ch];

  260.     band_idx  = 0;

  261.     memset(coeff_ptr, 0, ON2AVC_SUBFRAME_SIZE * sizeof(*coeff_ptr));

  262.     for (w = 0; w < c->num_windows; w++) {

  263.         for (b = 0; b < c->num_bands; b++) {

  264.             int band_size = c->band_start[b + 1] - c->band_start[b];

  265.             int band_type = c->band_type[band_idx + b];

  266. 

  267.             if (!band_type) {

  268.                 coeff_ptr += band_size;

  269.                 continue;

  270.             }

  271.             if (band_type < 9)

  272.                 on2avc_decode_quads(c, gb, coeff_ptr, band_size, band_type,

  273.                                     c->band_scales[band_idx + b]);

  274.             else

  275.                 on2avc_decode_pairs(c, gb, coeff_ptr, band_size, band_type,

  276.                                     c->band_scales[band_idx + b]);

  277.             coeff_ptr += band_size;

  278.         }

  279.         band_idx += c->num_bands;

  280.     }

  281. 

  282.     return 0;

  283. }

  284. 

  285. static int on2avc_apply_ms(On2AVCContext *c)

  286. {

  287.     int w, b, i;

  288.     int band_off = 0;

  289.     float *ch0 = c->coeffs[0];

  290.     float *ch1 = c->coeffs[1];

  291. 

  292.     for (w = 0; w < c->num_windows; w++) {

  293.         for (b = 0; b < c->num_bands; b++) {

  294.             if (c->ms_info[band_off + b]) {

  295.                 for (i = c->band_start[b]; i < c->band_start[b + 1]; i++) {

  296.                     float l = *ch0, r = *ch1;

  297.                     *ch0++ = l + r;

  298.                     *ch1++ = l - r;

  299.                 }

  300.             } else {

  301.                 ch0 += c->band_start[b + 1] - c->band_start[b];

  302.                 ch1 += c->band_start[b + 1] - c->band_start[b];

  303.             }

  304.         }

  305.         band_off += c->num_bands;

  306.     }

  307.     return 0;

  308. }

  309. 

  310. static void zero_head_and_tail(float *src, int len, int order0, int order1)

  311. {

  312.     memset(src,                0, sizeof(*src) * order0);

  313.     memset(src + len - order1, 0, sizeof(*src) * order1);

  314. }

  315. 

  316. static void pretwiddle(float *src, float *dst, int dst_len, int tab_step,

  317.                        int step, int order0, int order1, const double **tabs)

  318. {

  319.     float *src2, *out;

  320.     const double *tab;

  321.     int i, j;

  322. 

  323.     out = dst;

  324.     tab = tabs[0];

  325.     for (i = 0; i < tab_step; i++) {

  326.         double sum = 0;

  327.         for (j = 0; j < order0; j++)

  328.             sum += src[j] * tab[j * tab_step + i];

  329.         out[i] += sum;

  330.     }

  331. 

  332.     out = dst + dst_len - tab_step;

  333.     tab = tabs[order0];

  334.     src2 = src + (dst_len - tab_step) / step + 1 + order0;

  335.     for (i = 0; i < tab_step; i++) {

  336.         double sum = 0;

  337.         for (j = 0; j < order1; j++)

  338.             sum += src2[j] * tab[j * tab_step + i];

  339.         out[i] += sum;

  340.     }

  341. }

  342. 

  343. static void twiddle(float *src1, float *src2, int src2_len,

  344.                     const double *tab, int tab_len, int step,

  345.                     int order0, int order1, const double **tabs)

  346. {

  347.     int steps;

  348.     int mask;

  349.     int i, j;

  350. 

  351.     steps = (src2_len - tab_len) / step + 1;

  352.     pretwiddle(src1, src2, src2_len, tab_len, step, order0, order1, tabs);

  353.     mask = tab_len - 1;

  354. 

  355.     for (i = 0; i < steps; i++) {

  356.         float in0 = src1[order0 + i];

  357.         int   pos = (src2_len - 1) & mask;

  358. 

  359.         if (pos < tab_len) {

  360.             const double *t = tab;

  361.             for (j = pos; j >= 0; j--)

  362.                 src2[j] += in0 * *t++;

  363.             for (j = 0; j < tab_len - pos - 1; j++)

  364.                 src2[src2_len - j - 1] += in0 * tab[pos + 1 + j];

  365.         } else {

  366.             for (j = 0; j < tab_len; j++)

  367.                 src2[pos - j] += in0 * tab[j];

  368.         }

  369.         mask = pos + step;

  370.     }

  371. }

  372. 

  373. #define CMUL1_R(s, t, is, it) \

  374.     s[is + 0] * t[it + 0] - s[is + 1] * t[it + 1]

  375. #define CMUL1_I(s, t, is, it) \

  376.     s[is + 0] * t[it + 1] + s[is + 1] * t[it + 0]

  377. #define CMUL2_R(s, t, is, it) \

  378.     s[is + 0] * t[it + 0] + s[is + 1] * t[it + 1]

  379. #define CMUL2_I(s, t, is, it) \

  380.     s[is + 0] * t[it + 1] - s[is + 1] * t[it + 0]

  381. 

  382. #define CMUL0(dst, id, s0, s1, s2, s3, t0, t1, t2, t3, is, it)         \

  383.     dst[id]     = s0[is] * t0[it]     + s1[is] * t1[it]                \

  384.                 + s2[is] * t2[it]     + s3[is] * t3[it];               \

  385.     dst[id + 1] = s0[is] * t0[it + 1] + s1[is] * t1[it + 1]            \

  386.                 + s2[is] * t2[it + 1] + s3[is] * t3[it + 1];

  387. 

  388. #define CMUL1(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it)             \

  389.     *dst++ = CMUL1_R(s0, t0, is, it)                                   \

  390.            + CMUL1_R(s1, t1, is, it)                                   \

  391.            + CMUL1_R(s2, t2, is, it)                                   \

  392.            + CMUL1_R(s3, t3, is, it);                                  \

  393.     *dst++ = CMUL1_I(s0, t0, is, it)                                   \

  394.            + CMUL1_I(s1, t1, is, it)                                   \

  395.            + CMUL1_I(s2, t2, is, it)                                   \

  396.            + CMUL1_I(s3, t3, is, it);

  397. 

  398. #define CMUL2(dst, s0, s1, s2, s3, t0, t1, t2, t3, is, it)             \

  399.     *dst++ = CMUL2_R(s0, t0, is, it)                                   \

  400.            + CMUL2_R(s1, t1, is, it)                                   \

  401.            + CMUL2_R(s2, t2, is, it)                                   \

  402.            + CMUL2_R(s3, t3, is, it);                                  \

  403.     *dst++ = CMUL2_I(s0, t0, is, it)                                   \

  404.            + CMUL2_I(s1, t1, is, it)                                   \

  405.            + CMUL2_I(s2, t2, is, it)                                   \

  406.            + CMUL2_I(s3, t3, is, it);

  407. 

  408. static void combine_fft(float *s0, float *s1, float *s2, float *s3, float *dst,

  409.                         const float *t0, const float *t1,

  410.                         const float *t2, const float *t3, int len, int step)

  411. {

  412.     const float *h0, *h1, *h2, *h3;

  413.     float *d1, *d2;

  414.     int tmp, half;

  415.     int len2 = len >> 1, len4 = len >> 2;

  416.     int hoff;

  417.     int i, j, k;

  418. 

  419.     tmp = step;

  420.     for (half = len2; tmp > 1; half <<= 1, tmp >>= 1);

  421. 

  422.     h0 = t0 + half;

  423.     h1 = t1 + half;

  424.     h2 = t2 + half;

  425.     h3 = t3 + half;

  426. 

  427.     CMUL0(dst, 0, s0, s1, s2, s3, t0, t1, t2, t3, 0, 0);

  428. 

  429.     hoff = 2 * step * (len4 >> 1);

  430. 

  431.     j = 2;

  432.     k = 2 * step;

  433.     d1 = dst + 2;

  434.     d2 = dst + 2 + (len >> 1);

  435.     for (i = 0; i < (len4 - 1) >> 1; i++) {

  436.         CMUL1(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);

  437.         CMUL1(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);

  438.         j += 2;

  439.         k += 2 * step;

  440.     }

  441.     CMUL0(dst, len4,        s0, s1, s2, s3, t0, t1, t2, t3, 1, hoff);

  442.     CMUL0(dst, len4 + len2, s0, s1, s2, s3, h0, h1, h2, h3, 1, hoff);

  443. 

  444.     j = len4;

  445.     k = hoff + 2 * step * len4;

  446.     d1 = dst + len4 + 2;

  447.     d2 = dst + len4 + 2 + len2;

  448.     for (i = 0; i < (len4 - 2) >> 1; i++) {

  449.         CMUL2(d1, s0, s1, s2, s3, t0, t1, t2, t3, j, k);

  450.         CMUL2(d2, s0, s1, s2, s3, h0, h1, h2, h3, j, k);

  451.         j -= 2;

  452.         k += 2 * step;

  453.     }

  454.     CMUL0(dst, len2 + 4, s0, s1, s2, s3, t0, t1, t2, t3, 0, k);

  455. }

  456. 

  457. static void wtf_end_512(On2AVCContext *c, float *out, float *src,

  458.                         float *tmp0, float *tmp1)

  459. {

  460.     memcpy(src,        tmp0,      384 * sizeof(*tmp0));

  461.     memcpy(tmp0 + 384, src + 384, 128 * sizeof(*tmp0));

  462. 

  463.     zero_head_and_tail(src,       128, 16, 4);

  464.     zero_head_and_tail(src + 128, 128, 16, 4);

  465.     zero_head_and_tail(src + 256, 128, 13, 7);

  466.     zero_head_and_tail(src + 384, 128, 15, 5);

  467. 

  468.     c->fft128.fft_permute(&c->fft128, (FFTComplex*)src);

  469.     c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 128));

  470.     c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 256));

  471.     c->fft128.fft_permute(&c->fft128, (FFTComplex*)(src + 384));

  472.     c->fft128.fft_calc(&c->fft128, (FFTComplex*)src);

  473.     c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 128));

  474.     c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 256));

  475.     c->fft128.fft_calc(&c->fft128, (FFTComplex*)(src + 384));

  476.     combine_fft(src, src + 128, src + 256, src + 384, tmp1,

  477.                 ff_on2avc_ctab_1, ff_on2avc_ctab_2,

  478.                 ff_on2avc_ctab_3, ff_on2avc_ctab_4, 512, 2);

  479.     c->fft512.fft_permute(&c->fft512, (FFTComplex*)tmp1);

  480.     c->fft512.fft_calc(&c->fft512, (FFTComplex*)tmp1);

  481. 

  482.     pretwiddle(&tmp0[  0], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  483.     pretwiddle(&tmp0[128], tmp1, 512, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  484.     pretwiddle(&tmp0[256], tmp1, 512, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  485.     pretwiddle(&tmp0[384], tmp1, 512, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  486. 

  487.     memcpy(src, tmp1, 512 * sizeof(float));

  488. }

  489. 

  490. static void wtf_end_1024(On2AVCContext *c, float *out, float *src,

  491.                          float *tmp0, float *tmp1)

  492. {

  493.     memcpy(src,        tmp0,      768 * sizeof(*tmp0));

  494.     memcpy(tmp0 + 768, src + 768, 256 * sizeof(*tmp0));

  495. 

  496.     zero_head_and_tail(src,       256, 16, 4);

  497.     zero_head_and_tail(src + 256, 256, 16, 4);

  498.     zero_head_and_tail(src + 512, 256, 13, 7);

  499.     zero_head_and_tail(src + 768, 256, 15, 5);

  500. 

  501.     c->fft256.fft_permute(&c->fft256, (FFTComplex*)src);

  502.     c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 256));

  503.     c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 512));

  504.     c->fft256.fft_permute(&c->fft256, (FFTComplex*)(src + 768));

  505.     c->fft256.fft_calc(&c->fft256, (FFTComplex*)src);

  506.     c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 256));

  507.     c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 512));

  508.     c->fft256.fft_calc(&c->fft256, (FFTComplex*)(src + 768));

  509.     combine_fft(src, src + 256, src + 512, src + 768, tmp1,

  510.                 ff_on2avc_ctab_1, ff_on2avc_ctab_2,

  511.                 ff_on2avc_ctab_3, ff_on2avc_ctab_4, 1024, 1);

  512.     c->fft1024.fft_permute(&c->fft1024, (FFTComplex*)tmp1);

  513.     c->fft1024.fft_calc(&c->fft1024, (FFTComplex*)tmp1);

  514. 

  515.     pretwiddle(&tmp0[  0], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  516.     pretwiddle(&tmp0[256], tmp1, 1024, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  517.     pretwiddle(&tmp0[512], tmp1, 1024, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  518.     pretwiddle(&tmp0[768], tmp1, 1024, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  519. 

  520.     memcpy(src, tmp1, 1024 * sizeof(float));

  521. }

  522. 

  523. static void wtf_40(On2AVCContext *c, float *out, float *src, int size)

  524. {

  525.     float *tmp0 = c->temp, *tmp1 = c->temp + 1024;

  526. 

  527.     memset(tmp0, 0, sizeof(*tmp0) * 1024);

  528.     memset(tmp1, 0, sizeof(*tmp1) * 1024);

  529. 

  530.     if (size == 512) {

  531.         twiddle(src,       &tmp0[  0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  532.         twiddle(src +   8, &tmp0[  0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  533.         twiddle(src +  16, &tmp0[ 16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  534.         twiddle(src +  24, &tmp0[ 16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  535.         twiddle(src +  32, &tmp0[ 32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  536.         twiddle(src +  40, &tmp0[ 32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  537.         twiddle(src +  48, &tmp0[ 48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  538.         twiddle(src +  56, &tmp0[ 48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  539.         twiddle(&tmp0[ 0], &tmp1[  0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  540.         twiddle(&tmp0[16], &tmp1[  0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  541.         twiddle(&tmp0[32], &tmp1[ 32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  542.         twiddle(&tmp0[48], &tmp1[ 32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  543.         twiddle(src +  64, &tmp1[ 64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  544.         twiddle(src +  80, &tmp1[ 64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  545.         twiddle(src +  96, &tmp1[ 96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  546.         twiddle(src + 112, &tmp1[ 96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  547.         twiddle(src + 128, &tmp1[128], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  548.         twiddle(src + 144, &tmp1[128], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  549.         twiddle(src + 160, &tmp1[160], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  550.         twiddle(src + 176, &tmp1[160], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  551. 

  552.         memset(tmp0, 0, 64 * sizeof(*tmp0));

  553. 

  554.         twiddle(&tmp1[  0], &tmp0[  0], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  555.         twiddle(&tmp1[ 32], &tmp0[  0], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  556.         twiddle(&tmp1[ 64], &tmp0[  0], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  557.         twiddle(&tmp1[ 96], &tmp0[  0], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  558.         twiddle(&tmp1[128], &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  559.         twiddle(&tmp1[160], &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  560.         twiddle(src + 192,  &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  561.         twiddle(src + 224,  &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  562.         twiddle(src + 256,  &tmp0[256], 128, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  563.         twiddle(src + 288,  &tmp0[256], 128, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  564.         twiddle(src + 320,  &tmp0[256], 128, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  565.         twiddle(src + 352,  &tmp0[256], 128, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  566. 

  567.         wtf_end_512(c, out, src, tmp0, tmp1);

  568.     } else {

  569.         twiddle(src,       &tmp0[  0], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  570.         twiddle(src +  16, &tmp0[  0], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  571.         twiddle(src +  32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  572.         twiddle(src +  48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  573.         twiddle(src +  64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  574.         twiddle(src +  80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  575.         twiddle(src +  96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  576.         twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  577.         twiddle(&tmp0[ 0], &tmp1[  0], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  578.         twiddle(&tmp0[32], &tmp1[  0], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  579.         twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  580.         twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  581.         twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  582.         twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  583.         twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  584.         twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  585.         twiddle(src + 256, &tmp1[256], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  586.         twiddle(src + 288, &tmp1[256], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  587.         twiddle(src + 320, &tmp1[320], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  588.         twiddle(src + 352, &tmp1[320], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  589. 

  590.         memset(tmp0, 0, 128 * sizeof(*tmp0));

  591. 

  592.         twiddle(&tmp1[  0], &tmp0[  0], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  593.         twiddle(&tmp1[ 64], &tmp0[  0], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  594.         twiddle(&tmp1[128], &tmp0[  0], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  595.         twiddle(&tmp1[192], &tmp0[  0], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  596.         twiddle(&tmp1[256], &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  597.         twiddle(&tmp1[320], &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  598.         twiddle(src + 384,  &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  599.         twiddle(src + 448,  &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  600.         twiddle(src + 512,  &tmp0[512], 256, ff_on2avc_tab_84_1, 84, 4, 16, 4, ff_on2avc_tabs_20_84_1);

  601.         twiddle(src + 576,  &tmp0[512], 256, ff_on2avc_tab_84_2, 84, 4, 16, 4, ff_on2avc_tabs_20_84_2);

  602.         twiddle(src + 640,  &tmp0[512], 256, ff_on2avc_tab_84_3, 84, 4, 13, 7, ff_on2avc_tabs_20_84_3);

  603.         twiddle(src + 704,  &tmp0[512], 256, ff_on2avc_tab_84_4, 84, 4, 15, 5, ff_on2avc_tabs_20_84_4);

  604. 

  605.         wtf_end_1024(c, out, src, tmp0, tmp1);

  606.     }

  607. }

  608. 

  609. static void wtf_44(On2AVCContext *c, float *out, float *src, int size)

  610. {

  611.     float *tmp0 = c->temp, *tmp1 = c->temp + 1024;

  612. 

  613.     memset(tmp0, 0, sizeof(*tmp0) * 1024);

  614.     memset(tmp1, 0, sizeof(*tmp1) * 1024);

  615. 

  616.     if (size == 512) {

  617.         twiddle(src,       &tmp0[ 0], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  618.         twiddle(src +   8, &tmp0[ 0], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  619.         twiddle(src +  16, &tmp0[16], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  620.         twiddle(src +  24, &tmp0[16], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  621.         twiddle(src +  32, &tmp0[32], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  622.         twiddle(src +  40, &tmp0[32], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  623.         twiddle(src +  48, &tmp0[48], 16, ff_on2avc_tab_10_2, 10, 2, 3, 1, ff_on2avc_tabs_4_10_2);

  624.         twiddle(src +  56, &tmp0[48], 16, ff_on2avc_tab_10_1, 10, 2, 1, 3, ff_on2avc_tabs_4_10_1);

  625.         twiddle(&tmp0[ 0], &tmp1[ 0], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  626.         twiddle(&tmp0[16], &tmp1[ 0], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  627.         twiddle(&tmp0[32], &tmp1[32], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  628.         twiddle(&tmp0[48], &tmp1[32], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  629.         twiddle(src +  64, &tmp1[64], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  630.         twiddle(src +  80, &tmp1[64], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  631.         twiddle(src +  96, &tmp1[96], 32, ff_on2avc_tab_20_2, 20, 2, 4, 5, ff_on2avc_tabs_9_20_2);

  632.         twiddle(src + 112, &tmp1[96], 32, ff_on2avc_tab_20_1, 20, 2, 5, 4, ff_on2avc_tabs_9_20_1);

  633. 

  634.         memset(tmp0, 0, 64 * sizeof(*tmp0));

  635. 

  636.         twiddle(&tmp1[ 0], &tmp0[  0], 128, ff_on2avc_tab_84_1, 84, 4, 16,  4, ff_on2avc_tabs_20_84_1);

  637.         twiddle(&tmp1[32], &tmp0[  0], 128, ff_on2avc_tab_84_2, 84, 4, 16,  4, ff_on2avc_tabs_20_84_2);

  638.         twiddle(&tmp1[64], &tmp0[  0], 128, ff_on2avc_tab_84_3, 84, 4, 13,  7, ff_on2avc_tabs_20_84_3);

  639.         twiddle(&tmp1[96], &tmp0[  0], 128, ff_on2avc_tab_84_4, 84, 4, 15,  5, ff_on2avc_tabs_20_84_4);

  640.         twiddle(src + 128, &tmp0[128], 128, ff_on2avc_tab_84_4, 84, 4, 15,  5, ff_on2avc_tabs_20_84_4);

  641.         twiddle(src + 160, &tmp0[128], 128, ff_on2avc_tab_84_3, 84, 4, 13,  7, ff_on2avc_tabs_20_84_3);

  642.         twiddle(src + 192, &tmp0[128], 128, ff_on2avc_tab_84_2, 84, 4, 16,  4, ff_on2avc_tabs_20_84_2);

  643.         twiddle(src + 224, &tmp0[128], 128, ff_on2avc_tab_84_1, 84, 4, 16,  4, ff_on2avc_tabs_20_84_1);

  644.         twiddle(src + 256, &tmp0[256], 128, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  645.         twiddle(src + 320, &tmp0[256], 128, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  646. 

  647.         wtf_end_512(c, out, src, tmp0, tmp1);

  648.     } else {

  649.         twiddle(src,       &tmp0[  0], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  650.         twiddle(src +  16, &tmp0[  0], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  651.         twiddle(src +  32, &tmp0[ 32], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  652.         twiddle(src +  48, &tmp0[ 32], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  653.         twiddle(src +  64, &tmp0[ 64], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  654.         twiddle(src +  80, &tmp0[ 64], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  655.         twiddle(src +  96, &tmp0[ 96], 32, ff_on2avc_tab_20_2, 20, 2,  4,  5, ff_on2avc_tabs_9_20_2);

  656.         twiddle(src + 112, &tmp0[ 96], 32, ff_on2avc_tab_20_1, 20, 2,  5,  4, ff_on2avc_tabs_9_20_1);

  657.         twiddle(&tmp0[ 0], &tmp1[  0], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  658.         twiddle(&tmp0[32], &tmp1[  0], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  659.         twiddle(&tmp0[64], &tmp1[ 64], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  660.         twiddle(&tmp0[96], &tmp1[ 64], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  661.         twiddle(src + 128, &tmp1[128], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  662.         twiddle(src + 160, &tmp1[128], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  663.         twiddle(src + 192, &tmp1[192], 64, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  664.         twiddle(src + 224, &tmp1[192], 64, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  665. 

  666.         memset(tmp0, 0, 128 * sizeof(*tmp0));

  667. 

  668.         twiddle(&tmp1[  0], &tmp0[  0], 256, ff_on2avc_tab_84_1, 84, 4, 16,  4, ff_on2avc_tabs_20_84_1);

  669.         twiddle(&tmp1[ 64], &tmp0[  0], 256, ff_on2avc_tab_84_2, 84, 4, 16,  4, ff_on2avc_tabs_20_84_2);

  670.         twiddle(&tmp1[128], &tmp0[  0], 256, ff_on2avc_tab_84_3, 84, 4, 13,  7, ff_on2avc_tabs_20_84_3);

  671.         twiddle(&tmp1[192], &tmp0[  0], 256, ff_on2avc_tab_84_4, 84, 4, 15,  5, ff_on2avc_tabs_20_84_4);

  672.         twiddle(src + 256,  &tmp0[256], 256, ff_on2avc_tab_84_4, 84, 4, 15,  5, ff_on2avc_tabs_20_84_4);

  673.         twiddle(src + 320,  &tmp0[256], 256, ff_on2avc_tab_84_3, 84, 4, 13,  7, ff_on2avc_tabs_20_84_3);

  674.         twiddle(src + 384,  &tmp0[256], 256, ff_on2avc_tab_84_2, 84, 4, 16,  4, ff_on2avc_tabs_20_84_2);

  675.         twiddle(src + 448,  &tmp0[256], 256, ff_on2avc_tab_84_1, 84, 4, 16,  4, ff_on2avc_tabs_20_84_1);

  676.         twiddle(src + 512,  &tmp0[512], 256, ff_on2avc_tab_40_1, 40, 2, 11,  8, ff_on2avc_tabs_19_40_1);

  677.         twiddle(src + 640,  &tmp0[512], 256, ff_on2avc_tab_40_2, 40, 2,  8, 11, ff_on2avc_tabs_19_40_2);

  678. 

  679.         wtf_end_1024(c, out, src, tmp0, tmp1);

  680.     }

  681. }

  682. 

  683. static int on2avc_reconstruct_stereo(On2AVCContext *c, AVFrame *dst, int offset)

  684. {

  685.     int ch, i;

  686. 

  687.     for (ch = 0; ch < 2; ch++) {

  688.         float *out   = (float*)dst->extended_data[ch] + offset;

  689.         float *in    = c->coeffs[ch];

  690.         float *saved = c->delay[ch];

  691.         float *buf   = c->mdct_buf;

  692.         float *wout  = out + 448;

  693. 

  694.         switch (c->window_type) {

  695.         case WINDOW_TYPE_EXT7:

  696.             c->mdct.imdct_half(&c->mdct, buf, in);

  697.             break;

  698.         case WINDOW_TYPE_EXT4:

  699.             c->wtf(c, buf, in, 1024);

  700.             break;

  701.         case WINDOW_TYPE_EXT5:

  702.             c->wtf(c, buf, in, 512);

  703.             c->mdct.imdct_half(&c->mdct_half, buf + 512, in + 512);

  704.             for (i = 0; i < 256; i++) {

  705.                 FFSWAP(float, buf[i + 512], buf[1023 - i]);

  706.             }

  707.             break;

  708.         case WINDOW_TYPE_EXT6:

  709.             c->mdct.imdct_half(&c->mdct_half, buf, in);

  710.             for (i = 0; i < 256; i++) {

  711.                 FFSWAP(float, buf[i], buf[511 - i]);

  712.             }

  713.             c->wtf(c, buf + 512, in + 512, 512);

  714.             break;

  715.         }

  716. 

  717.         memcpy(out, saved, 448 * sizeof(float));

  718.         c->fdsp.vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);

  719.         memcpy(wout + 128,  buf + 64,         448 * sizeof(float));

  720.         memcpy(saved,       buf + 512,        448 * sizeof(float));

  721.         memcpy(saved + 448, buf + 7*128 + 64,  64 * sizeof(float));

  722.     }

  723. 

  724.     return 0;

  725. }

  726. 

  727. // not borrowed from aacdec.c - the codec has original design after all

  728. static int on2avc_reconstruct_channel(On2AVCContext *c, int channel,

  729.                                       AVFrame *dst, int offset)

  730. {

  731.     int i;

  732.     float *out   = (float*)dst->extended_data[channel] + offset;

  733.     float *in    = c->coeffs[channel];

  734.     float *saved = c->delay[channel];

  735.     float *buf   = c->mdct_buf;

  736.     float *temp  = c->temp;

  737. 

  738.     switch (c->window_type) {

  739.     case WINDOW_TYPE_LONG_START:

  740.     case WINDOW_TYPE_LONG_STOP:

  741.     case WINDOW_TYPE_LONG:

  742.         c->mdct.imdct_half(&c->mdct, buf, in);

  743.         break;

  744.     case WINDOW_TYPE_8SHORT:

  745.         for (i = 0; i < ON2AVC_SUBFRAME_SIZE; i += ON2AVC_SUBFRAME_SIZE / 8)

  746.             c->mdct_small.imdct_half(&c->mdct_small, buf + i, in + i);

  747.         break;

  748.     }

  749. 

  750.     if ((c->prev_window_type == WINDOW_TYPE_LONG ||

  751.          c->prev_window_type == WINDOW_TYPE_LONG_STOP) &&

  752.         (c->window_type == WINDOW_TYPE_LONG ||

  753.          c->window_type == WINDOW_TYPE_LONG_START)) {

  754.         c->fdsp.vector_fmul_window(out, saved, buf, c->long_win, 512);

  755.     } else {

  756.         float *wout = out + 448;

  757.         memcpy(out, saved, 448 * sizeof(float));

  758. 

  759.         if (c->window_type == WINDOW_TYPE_8SHORT) {

  760.             c->fdsp.vector_fmul_window(wout + 0*128, saved + 448,      buf + 0*128, c->short_win, 64);

  761.             c->fdsp.vector_fmul_window(wout + 1*128, buf + 0*128 + 64, buf + 1*128, c->short_win, 64);

  762.             c->fdsp.vector_fmul_window(wout + 2*128, buf + 1*128 + 64, buf + 2*128, c->short_win, 64);

  763.             c->fdsp.vector_fmul_window(wout + 3*128, buf + 2*128 + 64, buf + 3*128, c->short_win, 64);

  764.             c->fdsp.vector_fmul_window(temp,         buf + 3*128 + 64, buf + 4*128, c->short_win, 64);

  765.             memcpy(wout + 4*128, temp, 64 * sizeof(float));

  766.         } else {

  767.             c->fdsp.vector_fmul_window(wout, saved + 448, buf, c->short_win, 64);

  768.             memcpy(wout + 128, buf + 64, 448 * sizeof(float));

  769.         }

  770.     }

  771. 

  772.     // buffer update

  773.     switch (c->window_type) {

  774.     case WINDOW_TYPE_8SHORT:

  775.         memcpy(saved,       temp + 64,         64 * sizeof(float));

  776.         c->fdsp.vector_fmul_window(saved + 64,  buf + 4*128 + 64, buf + 5*128, c->short_win, 64);

  777.         c->fdsp.vector_fmul_window(saved + 192, buf + 5*128 + 64, buf + 6*128, c->short_win, 64);

  778.         c->fdsp.vector_fmul_window(saved + 320, buf + 6*128 + 64, buf + 7*128, c->short_win, 64);

  779.         memcpy(saved + 448, buf + 7*128 + 64,  64 * sizeof(float));

  780.         break;

  781.     case WINDOW_TYPE_LONG_START:

  782.         memcpy(saved,       buf + 512,        448 * sizeof(float));

  783.         memcpy(saved + 448, buf + 7*128 + 64,  64 * sizeof(float));

  784.         break;

  785.     case WINDOW_TYPE_LONG_STOP:

  786.     case WINDOW_TYPE_LONG:

  787.         memcpy(saved,       buf + 512,        512 * sizeof(float));

  788.         break;

  789.     }

  790.     return 0;

  791. }

  792. 

  793. static int on2avc_decode_subframe(On2AVCContext *c, const uint8_t *buf,

  794.                                   int buf_size, AVFrame *dst, int offset)

  795. {

  796.     GetBitContext gb;

  797.     int i, ret;

  798. 

  799.     init_get_bits(&gb, buf, buf_size * 8);

  800.     if (get_bits1(&gb)) {

  801.         av_log(c->avctx, AV_LOG_ERROR, "enh bit set\n");

  802.         return AVERROR_INVALIDDATA;

  803.     }

  804.     c->prev_window_type = c->window_type;

  805.     c->window_type      = get_bits(&gb, 3);

  806.     if (c->window_type >= WINDOW_TYPE_EXT4 && c->avctx->channels == 1) {

  807.         av_log(c->avctx, AV_LOG_ERROR, "stereo mode window for mono audio\n");

  808.         return AVERROR_INVALIDDATA;

  809.     }

  810. 

  811.     c->band_start  = c->modes[c->window_type].band_start;

  812.     c->num_windows = c->modes[c->window_type].num_windows;

  813.     c->num_bands   = c->modes[c->window_type].num_bands;

  814.     c->is_long     = (c->window_type != WINDOW_TYPE_8SHORT);

  815. 

  816.     c->grouping[0] = 1;

  817.     for (i = 1; i < c->num_windows; i++)

  818.         c->grouping[i] = !get_bits1(&gb);

  819. 

  820.     on2avc_read_ms_info(c, &gb);

  821.     for (i = 0; i < c->avctx->channels; i++)

  822.         if ((ret = on2avc_read_channel_data(c, &gb, i)) < 0)

  823.             return AVERROR_INVALIDDATA;

  824.     if (c->avctx->channels == 2 && c->ms_present)

  825.         on2avc_apply_ms(c);

  826.     if (c->window_type < WINDOW_TYPE_EXT4) {

  827.         for (i = 0; i < c->avctx->channels; i++)

  828.             on2avc_reconstruct_channel(c, i, dst, offset);

  829.     } else {

  830.         on2avc_reconstruct_stereo(c, dst, offset);

  831.     }

  832. 

  833.     return 0;

  834. }

  835. 

  836. static int on2avc_decode_frame(AVCodecContext * avctx, void *data,

  837.                                int *got_frame_ptr, AVPacket *avpkt)

  838. {

  839.     AVFrame *frame     = data;

  840.     const uint8_t *buf = avpkt->data;

  841.     int buf_size       = avpkt->size;

  842.     On2AVCContext *c   = avctx->priv_data;

  843.     GetByteContext gb;

  844.     int num_frames = 0, frame_size, audio_off;

  845.     int ret;

  846. 

  847.     if (c->is_av500) {

  848.         /* get output buffer */

  849.         frame->nb_samples = ON2AVC_SUBFRAME_SIZE;

  850.         if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {

  851.             av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  852.             return ret;

  853.         }

  854. 

  855.         if ((ret = on2avc_decode_subframe(c, buf, buf_size, frame, 0)) < 0)

  856.             return ret;

  857.     } else {

  858.         bytestream2_init(&gb, buf, buf_size);

  859.         while (bytestream2_get_bytes_left(&gb) > 2) {

  860.             frame_size = bytestream2_get_le16(&gb);

  861.             if (!frame_size || frame_size > bytestream2_get_bytes_left(&gb)) {

  862.                 av_log(avctx, AV_LOG_ERROR, "Invalid subframe size %d\n",

  863.                        frame_size);

  864.                 return AVERROR_INVALIDDATA;

  865.             }

  866.             num_frames++;

  867.             bytestream2_skip(&gb, frame_size);

  868.         }

  869.         if (!num_frames) {

  870.             av_log(avctx, AV_LOG_ERROR, "No subframes present\n");

  871.             return AVERROR_INVALIDDATA;

  872.         }

  873. 

  874.         /* get output buffer */

  875.         frame->nb_samples = ON2AVC_SUBFRAME_SIZE * num_frames;

  876.         if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {

  877.             av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  878.             return ret;

  879.         }

  880. 

  881.         audio_off = 0;

  882.         bytestream2_init(&gb, buf, buf_size);

  883.         while (bytestream2_get_bytes_left(&gb) > 2) {

  884.             frame_size = bytestream2_get_le16(&gb);

  885.             if ((ret = on2avc_decode_subframe(c, gb.buffer, frame_size,

  886.                                               frame, audio_off)) < 0)

  887.                 return ret;

  888.             audio_off += ON2AVC_SUBFRAME_SIZE;

  889.             bytestream2_skip(&gb, frame_size);

  890.         }

  891.     }

  892. 

  893.     *got_frame_ptr = 1;

  894. 

  895.     return buf_size;

  896. }

  897. 

  898. static av_cold void on2avc_free_vlcs(On2AVCContext *c)

  899. {

  900.     int i;

  901. 

  902.     ff_free_vlc(&c->scale_diff);

  903.     for (i = 1; i < 16; i++)

  904.         ff_free_vlc(&c->cb_vlc[i]);

  905. }

  906. 

  907. static av_cold int on2avc_decode_init(AVCodecContext *avctx)

  908. {

  909.     On2AVCContext *c = avctx->priv_data;

  910.     int i;

  911. 

  912.     c->avctx = avctx;

  913.     avctx->sample_fmt     = AV_SAMPLE_FMT_FLTP;

  914.     avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO

  915.                                                    : AV_CH_LAYOUT_MONO;

  916. 

  917.     c->is_av500 = (avctx->codec_tag == 0x500);

  918.     if (c->is_av500 && avctx->channels == 2) {

  919.         av_log(avctx, AV_LOG_ERROR, "0x500 version should be mono\n");

  920.         return AVERROR_INVALIDDATA;

  921.     }

  922.     if (avctx->channels == 2)

  923.         av_log(avctx, AV_LOG_WARNING,

  924.                "Stereo mode support is not good, patch is welcome\n");

  925. 

  926.     for (i = 0; i < 20; i++)

  927.         c->scale_tab[i] = ceil(pow(10.0, i * 0.1) * 16) / 32;

  928.     for (; i < 128; i++)

  929.         c->scale_tab[i] = ceil(pow(10.0, i * 0.1) * 0.5);

  930. 

  931.     if (avctx->sample_rate < 32000 || avctx->channels == 1)

  932.         memcpy(c->long_win, ff_on2avc_window_long_24000,

  933.                1024 * sizeof(*c->long_win));

  934.     else

  935.         memcpy(c->long_win, ff_on2avc_window_long_32000,

  936.                1024 * sizeof(*c->long_win));

  937.     memcpy(c->short_win, ff_on2avc_window_short, 128 * sizeof(*c->short_win));

  938. 

  939.     c->modes = (avctx->sample_rate <= 40000) ? ff_on2avc_modes_40

  940.                                              : ff_on2avc_modes_44;

  941.     c->wtf   = (avctx->sample_rate <= 40000) ? wtf_40

  942.                                              : wtf_44;

  943. 

  944.     ff_mdct_init(&c->mdct,       11, 1, 1.0 / (32768.0 * 1024.0));

  945.     ff_mdct_init(&c->mdct_half,  10, 1, 1.0 / (32768.0 * 512.0));

  946.     ff_mdct_init(&c->mdct_small,  8, 1, 1.0 / (32768.0 * 128.0));

  947.     ff_fft_init(&c->fft128,  6, 0);

  948.     ff_fft_init(&c->fft256,  7, 0);

  949.     ff_fft_init(&c->fft512,  8, 1);

  950.     ff_fft_init(&c->fft1024, 9, 1);

  951.     avpriv_float_dsp_init(&c->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  952. 

  953.     if (init_vlc(&c->scale_diff, 9, ON2AVC_SCALE_DIFFS,

  954.                  ff_on2avc_scale_diff_bits,  1, 1,

  955.                  ff_on2avc_scale_diff_codes, 4, 4, 0)) {

  956.         av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");

  957.         return AVERROR(ENOMEM);

  958.     }

  959.     for (i = 1; i < 9; i++) {

  960.         int idx = i - 1;

  961.         if (ff_init_vlc_sparse(&c->cb_vlc[i], 9, ff_on2avc_quad_cb_elems[idx],

  962.                                ff_on2avc_quad_cb_bits[idx],  1, 1,

  963.                                ff_on2avc_quad_cb_codes[idx], 4, 4,

  964.                                ff_on2avc_quad_cb_syms[idx],  2, 2, 0)) {

  965.             av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");

  966.             on2avc_free_vlcs(c);

  967.             return AVERROR(ENOMEM);

  968.         }

  969.     }

  970.     for (i = 9; i < 16; i++) {

  971.         int idx = i - 9;

  972.         if (ff_init_vlc_sparse(&c->cb_vlc[i], 9, ff_on2avc_pair_cb_elems[idx],

  973.                                ff_on2avc_pair_cb_bits[idx],  1, 1,

  974.                                ff_on2avc_pair_cb_codes[idx], 2, 2,

  975.                                ff_on2avc_pair_cb_syms[idx],  2, 2, 0)) {

  976.             av_log(avctx, AV_LOG_ERROR, "Cannot init VLC\n");

  977.             on2avc_free_vlcs(c);

  978.             return AVERROR(ENOMEM);

  979.         }

  980.     }

  981. 

  982.     return 0;

  983. }

  984. 

  985. static av_cold int on2avc_decode_close(AVCodecContext *avctx)

  986. {

  987.     On2AVCContext *c = avctx->priv_data;

  988. 

  989.     ff_mdct_end(&c->mdct);

  990.     ff_mdct_end(&c->mdct_half);

  991.     ff_mdct_end(&c->mdct_small);

  992.     ff_fft_end(&c->fft128);

  993.     ff_fft_end(&c->fft256);

  994.     ff_fft_end(&c->fft512);

  995.     ff_fft_end(&c->fft1024);

  996. 

  997.     on2avc_free_vlcs(c);

  998. 

  999.     return 0;

  1000. }

  1001. 

  1002. 

  1003. AVCodec ff_on2avc_decoder = {

  1004.     .name           = "on2avc",

  1005.     .long_name      = NULL_IF_CONFIG_SMALL("On2 Audio for Video Codec"),

  1006.     .type           = AVMEDIA_TYPE_AUDIO,

  1007.     .id             = AV_CODEC_ID_ON2AVC,

  1008.     .priv_data_size = sizeof(On2AVCContext),

  1009.     .init           = on2avc_decode_init,

  1010.     .decode         = on2avc_decode_frame,

  1011.     .close          = on2avc_decode_close,

  1012.     .capabilities   = CODEC_CAP_DR1,

  1013.     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  1014.                                                       AV_SAMPLE_FMT_NONE },

  1015. };