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FFmpeg/libavcodec/imm4.c

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  1. /*

  2.  * Infinity IMM4 decoder

  3.  *

  4.  * Copyright (c) 2018 Paul B Mahol

  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 <stdio.h>

  24. #include <stdlib.h>

  25. #include <string.h>

  26. 

  27. #include "libavutil/thread.h"

  28. 

  29. #include "avcodec.h"

  30. #include "bswapdsp.h"

  31. #include "copy_block.h"

  32. #include "get_bits.h"

  33. #include "idctdsp.h"

  34. #include "internal.h"

  35. 

  36. typedef struct IMM4Context {

  37.     BswapDSPContext bdsp;

  38.     GetBitContext  gb;

  39. 

  40.     AVFrame *prev_frame;

  41.     uint8_t *bitstream;

  42.     int bitstream_size;

  43. 

  44.     int factor;

  45.     unsigned lo;

  46.     unsigned hi;

  47. 

  48.     ScanTable intra_scantable;

  49.     DECLARE_ALIGNED(32, int16_t, block)[6][64];

  50.     IDCTDSPContext idsp;

  51. } IMM4Context;

  52. 

  53. static const uint8_t intra_cb[] = {

  54.     24, 18, 12

  55. };

  56. 

  57. static const uint8_t inter_cb[] = {

  58.     30, 20, 15

  59. };

  60. 

  61. static const uint8_t cbplo_symbols[] = {

  62.     3, 4, 19, 20, 35, 36, 51, 52

  63. };

  64. 

  65. static const uint8_t cbplo_bits[] = {

  66.     1, 4, 3, 6, 3, 6, 3, 6

  67. };

  68. 

  69. static const uint8_t cbplo_codes[] = {

  70.     1, 1, 1, 1, 2, 2, 3, 3

  71. };

  72. 

  73. static const uint8_t cbphi_bits[] = {

  74.     4, 5, 5, 4, 5, 4, 6, 4, 5, 6, 4, 4, 4, 4, 4, 2

  75. };

  76. 

  77. static const uint8_t cbphi_codes[] = {

  78.     3, 5, 4, 9, 3, 7, 2, 11, 2, 3, 5, 10, 4, 8, 6, 3

  79. };

  80. 

  81. static const uint8_t blktype_symbols[] = {

  82.     0, 1, 2, 3, 4, 16, 17, 18, 19, 20, 32, 33, 34, 35, 48, 50, 51, 52

  83. };

  84. 

  85. static const uint8_t blktype_bits[] = {

  86.     1, 3, 3, 5, 6, 4, 7, 7, 8, 9, 4, 7, 7, 8, 6, 8, 7, 9

  87. };

  88. 

  89. static const uint8_t blktype_codes[] = {

  90.     1, 3, 2, 3, 4, 3, 7, 5, 4, 4, 2, 6, 4, 3, 5, 5, 3, 2

  91. };

  92. 

  93. static const uint16_t block_symbols[] = {

  94.     0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0x81, 0x82, 0x83,

  95.     0x84, 0x85, 0x86, 0x101, 0x102, 0x103, 0x104, 0x181, 0x182, 0x183, 0x201, 0x202,

  96.     0x203, 0x281, 0x282, 0x283, 0x301, 0x302, 0x303, 0x381, 0x382, 0x401, 0x402,

  97.     0x481, 0x482, 0x501, 0x502, 0x581, 0x601, 0x681, 0x701, 0x781, 0x801, 0x881,

  98.     0x901, 0x981, 0xA01, 0xA81, 0xB01, 0xB81, 0xC01, 0xC81, 0xD01, 0x4001, 0x4002,

  99.     0x4003, 0x4081, 0x4082, 0x4101, 0x4181, 0x4201, 0x4281, 0x4301, 0x4381, 0x4401,

  100.     0x4481, 0x4501, 0x4581, 0x4601, 0x4681, 0x4701, 0x4781, 0x4801, 0x4881, 0x4901,

  101.     0x4981, 0x4A01, 0x4A81, 0x4B01, 0x4B81, 0x4C01, 0x4C81, 0x4D01, 0x4D81, 0x4E01,

  102.     0x4E81, 0x4F01, 0x4F81, 0x5001, 0x5081, 0x5101, 0x5181, 0x5201, 0x5281, 0x5301,

  103.     0x5381, 0x5401

  104. };

  105. 

  106. static const uint8_t block_bits[] = {

  107.     7, 2, 4, 6, 7, 8, 9, 9, 10, 10, 11, 11, 11, 3, 6, 8, 10, 11, 12, 4, 8,

  108.     10, 12, 5, 9, 10, 5, 9, 12, 5, 10, 12, 6, 10, 12, 6, 10, 6, 10, 6,

  109.     10, 7, 12, 7, 7, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 11, 11, 12, 12, 4, 9,

  110.     11, 6, 11, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9,

  111.     9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12,

  112.     12, 12

  113. };

  114. 

  115. static const uint8_t block_codes[] = {

  116.     3, 2, 15, 21, 23, 31, 37, 36, 33, 32, 7, 6, 32, 6, 20, 30, 15, 33, 80,

  117.     14, 29, 14, 81, 13, 35, 13, 12, 34, 82, 11, 12, 83, 19, 11, 84, 18,

  118.     10, 17, 9, 16, 8, 22, 85, 21, 20, 28, 27, 33, 32, 31, 30, 29, 28,

  119.     27, 26, 34, 35, 86, 87, 7, 25, 5, 15, 4, 14, 13, 12, 19, 18, 17, 16,

  120.     26, 25, 24, 23, 22, 21, 20, 19, 24, 23, 22, 21, 20, 19, 18, 17, 7,

  121.     6, 5, 4, 36, 37, 38, 39, 88, 89, 90, 91, 92, 93, 94, 95

  122. };

  123. 

  124. static VLC cbplo_tab;

  125. static VLC cbphi_tab;

  126. static VLC blktype_tab;

  127. static VLC block_tab;

  128. 

  129. static int get_cbphi(GetBitContext *gb, int x)

  130. {

  131.     int value;

  132. 

  133.     value = get_vlc2(gb, cbphi_tab.table, cbphi_tab.bits, 1);

  134.     if (value < 0)

  135.         return AVERROR_INVALIDDATA;

  136. 

  137.     return x ? value : 15 - value;

  138. }

  139. 

  140. static int decode_block(AVCodecContext *avctx, GetBitContext *gb,

  141.                         int block, int factor, int flag, int offset)

  142. {

  143.     IMM4Context *s = avctx->priv_data;

  144.     const uint8_t *scantable = s->intra_scantable.permutated;

  145.     int i, last, len, factor2;

  146. 

  147.     for (i = !flag; i < 64; i++) {

  148.         int value;

  149. 

  150.         value = get_vlc2(gb, block_tab.table, block_tab.bits, 1);

  151.         if (value < 0)

  152.             return AVERROR_INVALIDDATA;

  153.         if (value == 0) {

  154.             last = get_bits1(gb);

  155.             len = get_bits(gb, 6);

  156.             factor2 = get_sbits(gb, 8);

  157.         } else {

  158.             factor2 = value & 0x7F;

  159.             last = (value >> 14) & 1;

  160.             len = (value >> 7) & 0x3F;

  161.             if (get_bits1(gb))

  162.                 factor2 = -factor2;

  163.         }

  164.         i += len;

  165.         if (i >= 64)

  166.             break;

  167.         s->block[block][scantable[i]] = offset * (factor2 < 0 ? -1 : 1) + factor * factor2;

  168.         if (last)

  169.             break;

  170.     }

  171. 

  172.     return 0;

  173. }

  174. 

  175. static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb,

  176.                          unsigned cbp, int flag, int offset)

  177. {

  178.     IMM4Context *s = avctx->priv_data;

  179.     const uint8_t *scantable = s->intra_scantable.permutated;

  180.     int ret, i;

  181. 

  182.     memset(s->block, 0, sizeof(s->block));

  183. 

  184.     for (i = 0; i < 6; i++) {

  185.         if (!flag) {

  186.             int x = get_bits(gb, 8);

  187. 

  188.             if (x == 255)

  189.                 x = 128;

  190.             x *= 8;

  191. 

  192.             s->block[i][scantable[0]] = x;

  193.         }

  194. 

  195.         if (cbp & (1 << (5 - i))) {

  196.             ret = decode_block(avctx, gb, i, s->factor, flag, offset);

  197.             if (ret < 0)

  198.                 return ret;

  199.         }

  200.     }

  201. 

  202.     return 0;

  203. }

  204. 

  205. static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)

  206. {

  207.     IMM4Context *s = avctx->priv_data;

  208.     int ret, x, y, offset = 0;

  209. 

  210.     if (s->hi == 0) {

  211.         if (s->lo > 2)

  212.             return AVERROR_INVALIDDATA;

  213.         s->factor = intra_cb[s->lo];

  214.     } else {

  215.         if (s->hi == 1) {

  216.             s->factor = s->lo * 2;

  217.         } else {

  218.             s->factor = s->lo * 2;

  219.         }

  220.     }

  221. 

  222.     if (s->hi) {

  223.         offset = s->factor;

  224.         offset >>= 1;

  225.         if (!(offset & 1))

  226.             offset--;

  227.     }

  228. 

  229.     for (y = 0; y < avctx->height; y += 16) {

  230.         for (x = 0; x < avctx->width; x += 16) {

  231.             unsigned cbphi, cbplo;

  232. 

  233.             cbplo = get_vlc2(gb, cbplo_tab.table, cbplo_tab.bits, 1) >> 4;

  234.             skip_bits1(gb);

  235. 

  236.             cbphi = get_cbphi(gb, 1);

  237. 

  238.             ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset);

  239.             if (ret < 0)

  240.                 return ret;

  241. 

  242.             s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,

  243.                              frame->linesize[0], s->block[0]);

  244.             s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,

  245.                              frame->linesize[0], s->block[1]);

  246.             s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,

  247.                              frame->linesize[0], s->block[2]);

  248.             s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,

  249.                              frame->linesize[0], s->block[3]);

  250.             s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),

  251.                              frame->linesize[1], s->block[4]);

  252.             s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),

  253.                              frame->linesize[2], s->block[5]);

  254.         }

  255.     }

  256. 

  257.     return 0;

  258. }

  259. 

  260. static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,

  261.                         AVFrame *frame, AVFrame *prev)

  262. {

  263.     IMM4Context *s = avctx->priv_data;

  264.     int ret, x, y, offset = 0;

  265. 

  266.     if (s->hi == 0) {

  267.         if (s->lo > 2)

  268.             return AVERROR_INVALIDDATA;

  269.         s->factor = inter_cb[s->lo];

  270.     } else {

  271.         if (s->hi == 1) {

  272.             s->factor = s->lo * 2;

  273.         } else {

  274.             s->factor = s->lo * 2;

  275.         }

  276.     }

  277. 

  278.     if (s->hi) {

  279.         offset = s->factor;

  280.         offset >>= 1;

  281.         if (!(offset & 1))

  282.             offset--;

  283.     }

  284. 

  285.     for (y = 0; y < avctx->height; y += 16) {

  286.         for (x = 0; x < avctx->width; x += 16) {

  287.             int reverse, intra_block, value;

  288.             unsigned cbphi, cbplo;

  289. 

  290.             if (get_bits1(gb)) {

  291.                 copy_block16(frame->data[0] + y * frame->linesize[0] + x,

  292.                              prev->data[0] + y * prev->linesize[0] + x,

  293.                              frame->linesize[0], prev->linesize[0], 16);

  294.                 copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),

  295.                             prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),

  296.                             frame->linesize[1], prev->linesize[1], 8);

  297.                 copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),

  298.                             prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),

  299.                             frame->linesize[2], prev->linesize[2], 8);

  300.                 continue;

  301.             }

  302. 

  303.             value = get_vlc2(gb, blktype_tab.table, blktype_tab.bits, 1);

  304.             if (value < 0)

  305.                 return AVERROR_INVALIDDATA;

  306. 

  307.             intra_block = value & 0x07;

  308.             reverse = intra_block == 3;

  309.             if (reverse)

  310.                 skip_bits1(gb);

  311. 

  312.             cbplo = value >> 4;

  313.             cbphi = get_cbphi(gb, reverse);

  314.             if (intra_block) {

  315.                 ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0, offset);

  316.                 if (ret < 0)

  317.                     return ret;

  318. 

  319.                 s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,

  320.                                  frame->linesize[0], s->block[0]);

  321.                 s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,

  322.                                  frame->linesize[0], s->block[1]);

  323.                 s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,

  324.                                  frame->linesize[0], s->block[2]);

  325.                 s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,

  326.                                  frame->linesize[0], s->block[3]);

  327.                 s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),

  328.                                  frame->linesize[1], s->block[4]);

  329.                 s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),

  330.                                  frame->linesize[2], s->block[5]);

  331.             } else {

  332.                 skip_bits(gb, 2);

  333.                 ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 1, offset);

  334.                 if (ret < 0)

  335.                     return ret;

  336. 

  337.                 copy_block16(frame->data[0] + y * frame->linesize[0] + x,

  338.                              prev->data[0] + y * prev->linesize[0] + x,

  339.                              frame->linesize[0], prev->linesize[0], 16);

  340.                 copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),

  341.                             prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),

  342.                             frame->linesize[1], prev->linesize[1], 8);

  343.                 copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),

  344.                             prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),

  345.                             frame->linesize[2], prev->linesize[2], 8);

  346. 

  347.                 s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x,

  348.                                  frame->linesize[0], s->block[0]);

  349.                 s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x + 8,

  350.                                  frame->linesize[0], s->block[1]);

  351.                 s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x,

  352.                                  frame->linesize[0], s->block[2]);

  353.                 s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,

  354.                                  frame->linesize[0], s->block[3]);

  355.                 s->idsp.idct_add(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),

  356.                                  frame->linesize[1], s->block[4]);

  357.                 s->idsp.idct_add(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),

  358.                                  frame->linesize[2], s->block[5]);

  359.             }

  360.         }

  361.     }

  362. 

  363.     return 0;

  364. }

  365. 

  366. static int decode_frame(AVCodecContext *avctx, void *data,

  367.                         int *got_frame, AVPacket *avpkt)

  368. {

  369.     IMM4Context *s = avctx->priv_data;

  370.     GetBitContext *gb = &s->gb;

  371.     AVFrame *frame = data;

  372.     int width, height;

  373.     unsigned type;

  374.     int ret, scaled;

  375. 

  376.     if (avpkt->size <= 32)

  377.         return AVERROR_INVALIDDATA;

  378. 

  379.     av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,

  380.                           FFALIGN(avpkt->size, 4));

  381.     if (!s->bitstream)

  382.         return AVERROR(ENOMEM);

  383. 

  384.     s->bdsp.bswap_buf((uint32_t *)s->bitstream,

  385.                       (uint32_t *)avpkt->data,

  386.                       (avpkt->size + 3) >> 2);

  387. 

  388.     if ((ret = init_get_bits8(gb, s->bitstream, FFALIGN(avpkt->size, 4))) < 0)

  389.         return ret;

  390. 

  391.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  392.     avctx->color_range = AVCOL_RANGE_JPEG;

  393. 

  394.     width = avctx->width;

  395.     height = avctx->height;

  396. 

  397.     scaled = avpkt->data[8];

  398.     if (scaled < 2) {

  399.         int mode = avpkt->data[10];

  400. 

  401.         switch (mode) {

  402.         case 1:

  403.             width = 352;

  404.             height = 240;

  405.             break;

  406.         case 2:

  407.             width = 704;

  408.             height = 240;

  409.             break;

  410.         case 4:

  411.             width = 480;

  412.             height = 704;

  413.             break;

  414.         case 17:

  415.             width = 352;

  416.             height = 288;

  417.             break;

  418.         case 18:

  419.             width = 704;

  420.             height = 288;

  421.             break;

  422.         default:

  423.             width = 704;

  424.             height = 576;

  425.             break;

  426.         }

  427.     }

  428. 

  429.     skip_bits_long(gb, 24 * 8);

  430.     type = get_bits_long(gb, 32);

  431.     s->hi = get_bits(gb, 16);

  432.     s->lo = get_bits(gb, 16);

  433. 

  434.     switch (type) {

  435.     case 0x19781977:

  436.         frame->key_frame = 1;

  437.         frame->pict_type = AV_PICTURE_TYPE_I;

  438.         break;

  439.     case 0x12250926:

  440.         frame->key_frame = 0;

  441.         frame->pict_type = AV_PICTURE_TYPE_P;

  442.         break;

  443.     default:

  444.         avpriv_request_sample(avctx, "type %X", type);

  445.         return AVERROR_PATCHWELCOME;

  446.     }

  447. 

  448.     if (!frame->key_frame &&

  449.         (avctx->width != width ||

  450.          avctx->height != height)) {

  451.         av_log(avctx, AV_LOG_ERROR, "Frame size change is unsupported.\n");

  452.         return AVERROR_INVALIDDATA;

  453.     }

  454. 

  455.     ret = ff_set_dimensions(avctx, width, height);

  456.     if (ret < 0)

  457.         return ret;

  458. 

  459.     if ((ret = ff_get_buffer(avctx, frame, frame->key_frame ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)

  460.         return ret;

  461. 

  462.     if (frame->key_frame) {

  463.         ret = decode_intra(avctx, gb, frame);

  464.         if (ret < 0)

  465.             return ret;

  466. 

  467.         av_frame_unref(s->prev_frame);

  468.         if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)

  469.             return ret;

  470.     } else {

  471.         if (!s->prev_frame->data[0]) {

  472.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  473.             return AVERROR_INVALIDDATA;

  474.         }

  475. 

  476.         ret = decode_inter(avctx, gb, frame, s->prev_frame);

  477.         if (ret < 0)

  478.             return ret;

  479.     }

  480. 

  481.     *got_frame = 1;

  482. 

  483.     return avpkt->size;

  484. }

  485. 

  486. static av_cold void imm4_init_static_data(void)

  487. {

  488.     INIT_VLC_SPARSE_STATIC(&cbplo_tab, 9, FF_ARRAY_ELEMS(cbplo_bits),

  489.                            cbplo_bits, 1, 1, cbplo_codes, 1, 1, cbplo_symbols, 1, 1, 512);

  490. 

  491.     INIT_VLC_SPARSE_STATIC(&cbphi_tab, 6, FF_ARRAY_ELEMS(cbphi_bits),

  492.                            cbphi_bits, 1, 1, cbphi_codes, 1, 1, NULL, 0, 0, 64);

  493. 

  494.     INIT_VLC_SPARSE_STATIC(&blktype_tab, 9, FF_ARRAY_ELEMS(blktype_bits),

  495.                            blktype_bits, 1, 1, blktype_codes, 1, 1, blktype_symbols, 1, 1, 512);

  496. 

  497.     INIT_VLC_SPARSE_STATIC(&block_tab, 12, FF_ARRAY_ELEMS(block_bits),

  498.                            block_bits, 1, 1, block_codes, 1, 1, block_symbols, 2, 2, 4096);

  499. }

  500. 

  501. static av_cold int decode_init(AVCodecContext *avctx)

  502. {

  503.     static AVOnce init_static_once = AV_ONCE_INIT;

  504.     IMM4Context *s = avctx->priv_data;

  505.     uint8_t table[64];

  506. 

  507.     for (int i = 0; i < 64; i++)

  508.         table[i] = i;

  509. 

  510.     ff_bswapdsp_init(&s->bdsp);

  511.     ff_idctdsp_init(&s->idsp, avctx);

  512.     ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, table);

  513. 

  514.     s->prev_frame = av_frame_alloc();

  515.     if (!s->prev_frame)

  516.         return AVERROR(ENOMEM);

  517. 

  518.     ff_thread_once(&init_static_once, imm4_init_static_data);

  519. 

  520.     return 0;

  521. }

  522. 

  523. static av_cold int decode_close(AVCodecContext *avctx)

  524. {

  525.     IMM4Context *s = avctx->priv_data;

  526. 

  527.     av_frame_free(&s->prev_frame);

  528.     av_freep(&s->bitstream);

  529.     s->bitstream_size = 0;

  530. 

  531.     return 0;

  532. }

  533. 

  534. AVCodec ff_imm4_decoder = {

  535.     .name             = "imm4",

  536.     .long_name        = NULL_IF_CONFIG_SMALL("Infinity IMM4"),

  537.     .type             = AVMEDIA_TYPE_VIDEO,

  538.     .id               = AV_CODEC_ID_IMM4,

  539.     .priv_data_size   = sizeof(IMM4Context),

  540.     .init             = decode_init,

  541.     .close            = decode_close,

  542.     .decode           = decode_frame,

  543.     .capabilities     = AV_CODEC_CAP_DR1,

  544.     .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE |

  545.                         FF_CODEC_CAP_INIT_CLEANUP,

  546. };