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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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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 "fft.h"

  28. #include "get_bits.h"

  29. #include "internal.h"

  30. 

  31. #include "on2avcdata.h"

  32. 

  33. #define ON2AVC_SUBFRAME_SIZE   1024

  34. 

  35. enum WindowTypes {

  36.     WINDOW_TYPE_LONG       = 0,

  37.     WINDOW_TYPE_LONG_STOP,

  38.     WINDOW_TYPE_LONG_START,

  39.     WINDOW_TYPE_8SHORT     = 3,

  40.     WINDOW_TYPE_EXT4,

  41.     WINDOW_TYPE_EXT5,

  42.     WINDOW_TYPE_EXT6,

  43.     WINDOW_TYPE_EXT7,

  44. };

  45. 

  46. typedef struct On2AVCContext {

  47.     AVCodecContext *avctx;

  48.     AVFloatDSPContext fdsp;

  49.     FFTContext mdct, mdct_half, mdct_small;

  50.     FFTContext fft128, fft256, fft512, fft1024;

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

  52. 

  53.     int is_av500;

  54. 

  55.     const On2AVCMode *modes;

  56.     int window_type, prev_window_type;

  57.     int num_windows, num_bands;

  58.     int bits_per_section;

  59.     const int *band_start;

  60. 

  61.     int grouping[8];

  62.     int ms_present;

  63.     int ms_info[ON2AVC_MAX_BANDS];

  64. 

  65.     int is_long;

  66. 

  67.     uint8_t band_type[ON2AVC_MAX_BANDS];

  68.     uint8_t band_run_end[ON2AVC_MAX_BANDS];

  69.     int     num_sections;

  70. 

  71.     float band_scales[ON2AVC_MAX_BANDS];

  72. 

  73.     VLC scale_diff;

  74.     VLC cb_vlc[16];

  75. 

  76.     float scale_tab[128];

  77. 

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

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

  80. 

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

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

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

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

  85. } On2AVCContext;

  86. 

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

  88. {

  89.     int w, b, band_off = 0;

  90. 

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

  92.     if (!c->ms_present)

  93.         return;

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

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

  96.             memcpy(c->ms_info + band_off,

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

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

  99.             band_off += c->num_bands;

  100.             continue;

  101.         }

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

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

  104.     }

  105. }

  106. 

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

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

  109. {

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

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

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

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

  114. 

  115.     while (band < num_bands) {

  116.         band_type = get_bits(gb, 4);

  117.         run_len   = 1;

  118.         do {

  119.             run = get_bits(gb, bits_per_sect);

  120.             run_len += run;

  121.         } while (run == esc_val);

  122.         if (band + run_len > num_bands) {

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

  124.             return AVERROR_INVALIDDATA;

  125.         }

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

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

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

  129.         }

  130.         band += run_len;

  131.     }

  132. 

  133.     return 0;

  134. }

  135. 

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

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

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

  139. {

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

  141.     int band_off = 0;

  142. 

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

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

  145.             memcpy(c->band_scales + band_off,

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

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

  148.             band_off += c->num_bands;

  149.             continue;

  150.         }

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

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

  153.                 int all_zero = 1;

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

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

  156.                         break;

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

  158.                         all_zero = 0;

  159.                         break;

  160.                     }

  161.                 }

  162.                 if (all_zero) {

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

  164.                     continue;

  165.                 }

  166.             }

  167.             if (first) {

  168.                 scale = get_bits(gb, 7);

  169.                 first = 0;

  170.             } else {

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

  172.             }

  173.             if (scale < 0 || scale > 127) {

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

  175.                        scale);

  176.                 return AVERROR_INVALIDDATA;

  177.             }

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

  179.         }

  180.     }

  181. 

  182.     return 0;

  183. }

  184. 

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

  186. {

  187.     return v * sqrtf(abs(v)) * scale;

  188. }

  189. 

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

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

  192.                                int dst_size, int type, float band_scale)

  193. {

  194.     int i, j, val, val1;

  195. 

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

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

  198. 

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

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

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

  202.         }

  203.     }

  204. 

  205.     return 0;

  206. }

  207. 

  208. static inline int get_egolomb(GetBitContext *gb)

  209. {

  210.     int v = 4;

  211. 

  212.     while (get_bits1(gb)) {

  213.         v++;

  214.         if (v > 30) {

  215.             av_log(NULL, AV_LOG_WARNING, "Too large golomb code in get_egolomb.\n");

  216.             v = 30;

  217.             break;

  218.         }

  219.     }

  220. 

  221.     return (1 << v) + get_bits_long(gb, v);

  222. }

  223. 

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

  225.                                int dst_size, int type, float band_scale)

  226. {

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

  228. 

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

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

  231. 

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

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

  234.         if (type == ON2AVC_ESC_CB) {

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

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

  237.                 val1 = sign * get_egolomb(gb);

  238.             }

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

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

  241.                 val2 = sign * get_egolomb(gb);

  242.             }

  243.         }

  244. 

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

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

  247.     }

  248. 

  249.     return 0;

  250. }

  251. 

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

  253. {

  254.     int ret;

  255.     int w, b, band_idx;

  256.     float *coeff_ptr;

  257. 

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

  259.         return ret;

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

  261.         return ret;

  262. 

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

  264.     band_idx  = 0;

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

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

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

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

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

  270. 

  271.             if (!band_type) {

  272.                 coeff_ptr += band_size;

  273.                 continue;

  274.             }

  275.             if (band_type < 9)

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

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

  278.             else

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

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

  281.             coeff_ptr += band_size;

  282.         }

  283.         band_idx += c->num_bands;

  284.     }

  285. 

  286.     return 0;

  287. }

  288. 

  289. static int on2avc_apply_ms(On2AVCContext *c)

  290. {

  291.     int w, b, i;

  292.     int band_off = 0;

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

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

  295. 

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

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

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

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

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

  301.                     *ch0++ = l + r;

  302.                     *ch1++ = l - r;

  303.                 }

  304.             } else {

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

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

  307.             }

  308.         }

  309.         band_off += c->num_bands;

  310.     }

  311.     return 0;

  312. }

  313. 

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

  315. {

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

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

  318. }

  319. 

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

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

  322. {

  323.     float *src2, *out;

  324.     const double *tab;

  325.     int i, j;

  326. 

  327.     out = dst;

  328.     tab = tabs[0];

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

  330.         double sum = 0;

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

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

  333.         out[i] += sum;

  334.     }

  335. 

  336.     out = dst + dst_len - tab_step;

  337.     tab = tabs[order0];

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

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

  340.         double sum = 0;

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

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

  343.         out[i] += sum;

  344.     }

  345. }

  346. 

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

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

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

  350. {

  351.     int steps;

  352.     int mask;

  353.     int i, j;

  354. 

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

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

  357.     mask = tab_len - 1;

  358. 

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

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

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

  362. 

  363.         if (pos < tab_len) {

  364.             const double *t = tab;

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

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

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

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

  369.         } else {

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

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

  372.         }

  373.         mask = pos + step;

  374.     }

  375. }

  376. 

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

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

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

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

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

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

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

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

  385. 

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

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

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

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

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

  391. 

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

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

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

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

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

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

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

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

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

  401. 

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

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

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

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

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

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

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

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

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

  411. 

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

  413.                         const float *t0, const float *t1,

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

  415. {

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

  417.     float *d1, *d2;

  418.     int tmp, half;

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

  420.     int hoff;

  421.     int i, j, k;

  422. 

  423.     tmp = step;

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

  425. 

  426.     h0 = t0 + half;

  427.     h1 = t1 + half;

  428.     h2 = t2 + half;

  429.     h3 = t3 + half;

  430. 

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

  432. 

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

  434. 

  435.     j = 2;

  436.     k = 2 * step;

  437.     d1 = dst + 2;

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

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

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

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

  442.         j += 2;

  443.         k += 2 * step;

  444.     }

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

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

  447. 

  448.     j = len4;

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

  450.     d1 = dst + len4 + 2;

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

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

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

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

  455.         j -= 2;

  456.         k += 2 * step;

  457.     }

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

  459. }

  460. 

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

  462.                         float *tmp0, float *tmp1)

  463. {

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

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

  466. 

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

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

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

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

  471. 

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

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

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

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

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

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

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

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

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

  481.                 ff_on2avc_ctab_1, ff_on2avc_ctab_2,

  482.                 ff_on2avc_ctab_3, ff_on2avc_ctab_4, 512, 2);

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

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

  485. 

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

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

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

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

  490. 

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

  492. }

  493. 

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

  495.                          float *tmp0, float *tmp1)

  496. {

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

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

  499. 

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

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

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

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

  504. 

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

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

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

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

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

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

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

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

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

  514.                 ff_on2avc_ctab_1, ff_on2avc_ctab_2,

  515.                 ff_on2avc_ctab_3, ff_on2avc_ctab_4, 1024, 1);

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

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

  518. 

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

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

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

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

  523. 

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

  525. }

  526. 

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

  528. {

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

  530. 

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

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

  533. 

  534.     if (size == 512) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  555. 

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

  557. 

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

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

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

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

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

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

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

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

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

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

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

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

  570. 

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

  572.     } else {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  593. 

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

  595. 

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

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

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

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

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

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

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

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

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

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

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

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

  608. 

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

  610.     }

  611. }

  612. 

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

  614. {

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

  616. 

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

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

  619. 

  620.     if (size == 512) {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  637. 

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

  639. 

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

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

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

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

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

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

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

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

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

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

  650. 

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

  652.     } else {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  669. 

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

  671. 

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

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

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

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

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

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

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

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

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

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

  682. 

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

  684.     }

  685. }

  686. 

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

  688. {

  689.     int ch, i;

  690. 

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

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

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

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

  695.         float *buf   = c->mdct_buf;

  696.         float *wout  = out + 448;

  697. 

  698.         switch (c->window_type) {

  699.         case WINDOW_TYPE_EXT7:

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

  701.             break;

  702.         case WINDOW_TYPE_EXT4:

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

  704.             break;

  705.         case WINDOW_TYPE_EXT5:

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

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

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

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

  710.             }

  711.             break;

  712.         case WINDOW_TYPE_EXT6:

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

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

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

  716.             }

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

  718.             break;

  719.         }

  720. 

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

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

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

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

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

  726.     }

  727. 

  728.     return 0;

  729. }

  730. 

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

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

  733.                                       AVFrame *dst, int offset)

  734. {

  735.     int i;

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

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

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

  739.     float *buf   = c->mdct_buf;

  740.     float *temp  = c->temp;

  741. 

  742.     switch (c->window_type) {

  743.     case WINDOW_TYPE_LONG_START:

  744.     case WINDOW_TYPE_LONG_STOP:

  745.     case WINDOW_TYPE_LONG:

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

  747.         break;

  748.     case WINDOW_TYPE_8SHORT:

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

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

  751.         break;

  752.     }

  753. 

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

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

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

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

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

  759.     } else {

  760.         float *wout = out + 448;

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

  762. 

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

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

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

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

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

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

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

  770.         } else {

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

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

  773.         }

  774.     }

  775. 

  776.     // buffer update

  777.     switch (c->window_type) {

  778.     case WINDOW_TYPE_8SHORT:

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

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

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

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

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

  784.         break;

  785.     case WINDOW_TYPE_LONG_START:

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

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

  788.         break;

  789.     case WINDOW_TYPE_LONG_STOP:

  790.     case WINDOW_TYPE_LONG:

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

  792.         break;

  793.     }

  794.     return 0;

  795. }

  796. 

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

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

  799. {

  800.     GetBitContext gb;

  801.     int i, ret;

  802. 

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

  804.     if (get_bits1(&gb)) {

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

  806.         return AVERROR_INVALIDDATA;

  807.     }

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

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

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

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

  812.         return AVERROR_INVALIDDATA;

  813.     }

  814. 

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

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

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

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

  819. 

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

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

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

  823. 

  824.     on2avc_read_ms_info(c, &gb);

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

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

  827.             return AVERROR_INVALIDDATA;

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

  829.         on2avc_apply_ms(c);

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

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

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

  833.     } else {

  834.         on2avc_reconstruct_stereo(c, dst, offset);

  835.     }

  836. 

  837.     return 0;

  838. }

  839. 

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

  841.                                int *got_frame_ptr, AVPacket *avpkt)

  842. {

  843.     AVFrame *frame     = data;

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

  845.     int buf_size       = avpkt->size;

  846.     On2AVCContext *c   = avctx->priv_data;

  847.     GetByteContext gb;

  848.     int num_frames = 0, frame_size, audio_off;

  849.     int ret;

  850. 

  851.     if (c->is_av500) {

  852.         /* get output buffer */

  853.         frame->nb_samples = ON2AVC_SUBFRAME_SIZE;

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

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

  856.             return ret;

  857.         }

  858. 

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

  860.             return ret;

  861.     } else {

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

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

  864.             frame_size = bytestream2_get_le16(&gb);

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

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

  867.                        frame_size);

  868.                 return AVERROR_INVALIDDATA;

  869.             }

  870.             num_frames++;

  871.             bytestream2_skip(&gb, frame_size);

  872.         }

  873.         if (!num_frames) {

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

  875.             return AVERROR_INVALIDDATA;

  876.         }

  877. 

  878.         /* get output buffer */

  879.         frame->nb_samples = ON2AVC_SUBFRAME_SIZE * num_frames;

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

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

  882.             return ret;

  883.         }

  884. 

  885.         audio_off = 0;

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

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

  888.             frame_size = bytestream2_get_le16(&gb);

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

  890.                                               frame, audio_off)) < 0)

  891.                 return ret;

  892.             audio_off += ON2AVC_SUBFRAME_SIZE;

  893.             bytestream2_skip(&gb, frame_size);

  894.         }

  895.     }

  896. 

  897.     *got_frame_ptr = 1;

  898. 

  899.     return buf_size;

  900. }

  901. 

  902. static av_cold void on2avc_free_vlcs(On2AVCContext *c)

  903. {

  904.     int i;

  905. 

  906.     ff_free_vlc(&c->scale_diff);

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

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

  909. }

  910. 

  911. static av_cold int on2avc_decode_init(AVCodecContext *avctx)

  912. {

  913.     On2AVCContext *c = avctx->priv_data;

  914.     int i;

  915. 

  916.     c->avctx = avctx;

  917.     avctx->sample_fmt     = AV_SAMPLE_FMT_FLTP;

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

  919.                                                    : AV_CH_LAYOUT_MONO;

  920. 

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

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

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

  924.         return AVERROR_INVALIDDATA;

  925.     }

  926.     if (avctx->channels > 2) {

  927.         av_log(avctx, AV_LOG_ERROR, "Only 1 or 2 channels are supported.\n");

  928.         return AVERROR(EINVAL);

  929.     }

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

  931.         av_log(avctx, AV_LOG_WARNING,

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

  933. 

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

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

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

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

  938. 

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

  940.         memcpy(c->long_win, ff_on2avc_window_long_24000,

  941.                1024 * sizeof(*c->long_win));

  942.     else

  943.         memcpy(c->long_win, ff_on2avc_window_long_32000,

  944.                1024 * sizeof(*c->long_win));

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

  946. 

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

  948.                                              : ff_on2avc_modes_44;

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

  950.                                              : wtf_44;

  951. 

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

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

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

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

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

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

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

  959.     avpriv_float_dsp_init(&c->fdsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);

  960. 

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

  962.                  ff_on2avc_scale_diff_bits,  1, 1,

  963.                  ff_on2avc_scale_diff_codes, 4, 4, 0)) {

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

  965.         return AVERROR(ENOMEM);

  966.     }

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

  968.         int idx = i - 1;

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

  970.                                ff_on2avc_quad_cb_bits[idx],  1, 1,

  971.                                ff_on2avc_quad_cb_codes[idx], 4, 4,

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

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

  974.             on2avc_free_vlcs(c);

  975.             return AVERROR(ENOMEM);

  976.         }

  977.     }

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

  979.         int idx = i - 9;

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

  981.                                ff_on2avc_pair_cb_bits[idx],  1, 1,

  982.                                ff_on2avc_pair_cb_codes[idx], 2, 2,

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

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

  985.             on2avc_free_vlcs(c);

  986.             return AVERROR(ENOMEM);

  987.         }

  988.     }

  989. 

  990.     return 0;

  991. }

  992. 

  993. static av_cold int on2avc_decode_close(AVCodecContext *avctx)

  994. {

  995.     On2AVCContext *c = avctx->priv_data;

  996. 

  997.     ff_mdct_end(&c->mdct);

  998.     ff_mdct_end(&c->mdct_half);

  999.     ff_mdct_end(&c->mdct_small);

  1000.     ff_fft_end(&c->fft128);

  1001.     ff_fft_end(&c->fft256);

  1002.     ff_fft_end(&c->fft512);

  1003.     ff_fft_end(&c->fft1024);

  1004. 

  1005.     on2avc_free_vlcs(c);

  1006. 

  1007.     return 0;

  1008. }

  1009. 

  1010. 

  1011. AVCodec ff_on2avc_decoder = {

  1012.     .name           = "on2avc",

  1013.     .long_name      = NULL_IF_CONFIG_SMALL("On2 Audio for Video Codec"),

  1014.     .type           = AVMEDIA_TYPE_AUDIO,

  1015.     .id             = AV_CODEC_ID_ON2AVC,

  1016.     .priv_data_size = sizeof(On2AVCContext),

  1017.     .init           = on2avc_decode_init,

  1018.     .decode         = on2avc_decode_frame,

  1019.     .close          = on2avc_decode_close,

  1020.     .capabilities   = AV_CODEC_CAP_DR1,

  1021.     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  1022.                                                       AV_SAMPLE_FMT_NONE },

  1023. };