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FFmpeg/libavcodec/ffv1dec.c

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  1. /*

  2.  * FFV1 decoder

  3.  *

  4.  * Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * FF Video Codec 1 (a lossless codec) decoder

  26.  */

  27. 

  28. #include "libavutil/avassert.h"

  29. #include "libavutil/crc.h"

  30. #include "libavutil/opt.h"

  31. #include "libavutil/imgutils.h"

  32. #include "libavutil/pixdesc.h"

  33. #include "libavutil/timer.h"

  34. #include "avcodec.h"

  35. #include "internal.h"

  36. #include "get_bits.h"

  37. #include "rangecoder.h"

  38. #include "golomb.h"

  39. #include "mathops.h"

  40. #include "ffv1.h"

  41. 

  42. static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,

  43.                                                int is_signed)

  44. {

  45.     if (get_rac(c, state + 0))

  46.         return 0;

  47.     else {

  48.         int i, e, a;

  49.         e = 0;

  50.         while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10

  51.             e++;

  52. 

  53.         a = 1;

  54.         for (i = e - 1; i >= 0; i--)

  55.             a += a + get_rac(c, state + 22 + FFMIN(i, 9));  // 22..31

  56. 

  57.         e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21

  58.         return (a ^ e) - e;

  59.     }

  60. }

  61. 

  62. static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)

  63. {

  64.     return get_symbol_inline(c, state, is_signed);

  65. }

  66. 

  67. static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,

  68.                                  int bits)

  69. {

  70.     int k, i, v, ret;

  71. 

  72.     i = state->count;

  73.     k = 0;

  74.     while (i < state->error_sum) { // FIXME: optimize

  75.         k++;

  76.         i += i;

  77.     }

  78. 

  79.     v = get_sr_golomb(gb, k, 12, bits);

  80.     av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",

  81.             v, state->bias, state->error_sum, state->drift, state->count, k);

  82. 

  83. #if 0 // JPEG LS

  84.     if (k == 0 && 2 * state->drift <= -state->count)

  85.         v ^= (-1);

  86. #else

  87.     v ^= ((2 * state->drift + state->count) >> 31);

  88. #endif

  89. 

  90.     ret = fold(v + state->bias, bits);

  91. 

  92.     update_vlc_state(state, v);

  93. 

  94.     return ret;

  95. }

  96. 

  97. static av_always_inline void decode_line(FFV1Context *s, int w,

  98.                                          int16_t *sample[2],

  99.                                          int plane_index, int bits)

  100. {

  101.     PlaneContext *const p = &s->plane[plane_index];

  102.     RangeCoder *const c   = &s->c;

  103.     int x;

  104.     int run_count = 0;

  105.     int run_mode  = 0;

  106.     int run_index = s->run_index;

  107. 

  108.     if (s->slice_coding_mode == 1) {

  109.         int i;

  110.         for (x = 0; x < w; x++) {

  111.             int v = 0;

  112.             for (i=0; i<bits; i++) {

  113.                 uint8_t state = 128;

  114.                 v += v + get_rac(c, &state);

  115.             }

  116.             sample[1][x] = v;

  117.         }

  118.         return;

  119.     }

  120. 

  121.     for (x = 0; x < w; x++) {

  122.         int diff, context, sign;

  123. 

  124.         context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  125.         if (context < 0) {

  126.             context = -context;

  127.             sign    = 1;

  128.         } else

  129.             sign = 0;

  130. 

  131.         av_assert2(context < p->context_count);

  132. 

  133.         if (s->ac) {

  134.             diff = get_symbol_inline(c, p->state[context], 1);

  135.         } else {

  136.             if (context == 0 && run_mode == 0)

  137.                 run_mode = 1;

  138. 

  139.             if (run_mode) {

  140.                 if (run_count == 0 && run_mode == 1) {

  141.                     if (get_bits1(&s->gb)) {

  142.                         run_count = 1 << ff_log2_run[run_index];

  143.                         if (x + run_count <= w)

  144.                             run_index++;

  145.                     } else {

  146.                         if (ff_log2_run[run_index])

  147.                             run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  148.                         else

  149.                             run_count = 0;

  150.                         if (run_index)

  151.                             run_index--;

  152.                         run_mode = 2;

  153.                     }

  154.                 }

  155.                 run_count--;

  156.                 if (run_count < 0) {

  157.                     run_mode  = 0;

  158.                     run_count = 0;

  159.                     diff      = get_vlc_symbol(&s->gb, &p->vlc_state[context],

  160.                                                bits);

  161.                     if (diff >= 0)

  162.                         diff++;

  163.                 } else

  164.                     diff = 0;

  165.             } else

  166.                 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  167. 

  168.             av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",

  169.                     run_count, run_index, run_mode, x, get_bits_count(&s->gb));

  170.         }

  171. 

  172.         if (sign)

  173.             diff = -diff;

  174. 

  175.         sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &

  176.                        ((1 << bits) - 1);

  177.     }

  178.     s->run_index = run_index;

  179. }

  180. 

  181. static void decode_plane(FFV1Context *s, uint8_t *src,

  182.                          int w, int h, int stride, int plane_index)

  183. {

  184.     int x, y;

  185.     int16_t *sample[2];

  186.     sample[0] = s->sample_buffer + 3;

  187.     sample[1] = s->sample_buffer + w + 6 + 3;

  188. 

  189.     s->run_index = 0;

  190. 

  191.     memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));

  192. 

  193.     for (y = 0; y < h; y++) {

  194.         int16_t *temp = sample[0]; // FIXME: try a normal buffer

  195. 

  196.         sample[0] = sample[1];

  197.         sample[1] = temp;

  198. 

  199.         sample[1][-1] = sample[0][0];

  200.         sample[0][w]  = sample[0][w - 1];

  201. 

  202. // { START_TIMER

  203.         if (s->avctx->bits_per_raw_sample <= 8) {

  204.             decode_line(s, w, sample, plane_index, 8);

  205.             for (x = 0; x < w; x++)

  206.                 src[x + stride * y] = sample[1][x];

  207.         } else {

  208.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  209.             if (s->packed_at_lsb) {

  210.                 for (x = 0; x < w; x++) {

  211.                     ((uint16_t*)(src + stride*y))[x] = sample[1][x];

  212.                 }

  213.             } else {

  214.                 for (x = 0; x < w; x++) {

  215.                     ((uint16_t*)(src + stride*y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  216.                 }

  217.             }

  218.         }

  219. // STOP_TIMER("decode-line") }

  220.     }

  221. }

  222. 

  223. static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3])

  224. {

  225.     int x, y, p;

  226.     int16_t *sample[4][2];

  227.     int lbd    = s->avctx->bits_per_raw_sample <= 8;

  228.     int bits   = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;

  229.     int offset = 1 << bits;

  230. 

  231.     for (x = 0; x < 4; x++) {

  232.         sample[x][0] = s->sample_buffer +  x * 2      * (w + 6) + 3;

  233.         sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;

  234.     }

  235. 

  236.     s->run_index = 0;

  237. 

  238.     memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer));

  239. 

  240.     for (y = 0; y < h; y++) {

  241.         for (p = 0; p < 3 + s->transparency; p++) {

  242.             int16_t *temp = sample[p][0]; // FIXME: try a normal buffer

  243. 

  244.             sample[p][0] = sample[p][1];

  245.             sample[p][1] = temp;

  246. 

  247.             sample[p][1][-1]= sample[p][0][0  ];

  248.             sample[p][0][ w]= sample[p][0][w-1];

  249.             if (lbd && s->slice_coding_mode == 0)

  250.                 decode_line(s, w, sample[p], (p + 1)/2, 9);

  251.             else

  252.                 decode_line(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));

  253.         }

  254.         for (x = 0; x < w; x++) {

  255.             int g = sample[0][1][x];

  256.             int b = sample[1][1][x];

  257.             int r = sample[2][1][x];

  258.             int a = sample[3][1][x];

  259. 

  260.             if (s->slice_coding_mode != 1) {

  261.                 b -= offset;

  262.                 r -= offset;

  263.                 g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;

  264.                 b += g;

  265.                 r += g;

  266.             }

  267. 

  268.             if (lbd)

  269.                 *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);

  270.             else {

  271.                 *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;

  272.                 *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;

  273.                 *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;

  274.             }

  275.         }

  276.     }

  277. }

  278. 

  279. static int decode_slice_header(FFV1Context *f, FFV1Context *fs)

  280. {

  281.     RangeCoder *c = &fs->c;

  282.     uint8_t state[CONTEXT_SIZE];

  283.     unsigned ps, i, context_count;

  284.     memset(state, 128, sizeof(state));

  285. 

  286.     av_assert0(f->version > 2);

  287. 

  288.     fs->slice_x      =  get_symbol(c, state, 0)      * f->width ;

  289.     fs->slice_y      =  get_symbol(c, state, 0)      * f->height;

  290.     fs->slice_width  = (get_symbol(c, state, 0) + 1) * f->width  + fs->slice_x;

  291.     fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;

  292. 

  293.     fs->slice_x /= f->num_h_slices;

  294.     fs->slice_y /= f->num_v_slices;

  295.     fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  296.     fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  297.     if ((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  298.         return -1;

  299.     if (    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  300.          || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  301.         return -1;

  302. 

  303.     for (i = 0; i < f->plane_count; i++) {

  304.         PlaneContext * const p = &fs->plane[i];

  305.         int idx = get_symbol(c, state, 0);

  306.         if (idx > (unsigned)f->quant_table_count) {

  307.             av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  308.             return -1;

  309.         }

  310.         p->quant_table_index = idx;

  311.         memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  312.         context_count = f->context_count[idx];

  313. 

  314.         if (p->context_count < context_count) {

  315.             av_freep(&p->state);

  316.             av_freep(&p->vlc_state);

  317.         }

  318.         p->context_count = context_count;

  319.     }

  320. 

  321.     ps = get_symbol(c, state, 0);

  322.     if (ps == 1) {

  323.         f->cur->interlaced_frame = 1;

  324.         f->cur->top_field_first  = 1;

  325.     } else if (ps == 2) {

  326.         f->cur->interlaced_frame = 1;

  327.         f->cur->top_field_first  = 0;

  328.     } else if (ps == 3) {

  329.         f->cur->interlaced_frame = 0;

  330.     }

  331.     f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0);

  332.     f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0);

  333.     if (fs->version > 3) {

  334.         fs->slice_reset_contexts = get_rac(c, state);

  335.         fs->slice_coding_mode = get_symbol(c, state, 0);

  336.         if (fs->slice_coding_mode != 1) {

  337.             fs->slice_rct_by_coef = get_symbol(c, state, 0);

  338.             fs->slice_rct_ry_coef = get_symbol(c, state, 0);

  339.             if ((uint64_t)fs->slice_rct_by_coef + (uint64_t)fs->slice_rct_ry_coef > 4) {

  340.                 av_log(f->avctx, AV_LOG_ERROR, "slice_rct_y_coef out of range\n");

  341.                 return AVERROR_INVALIDDATA;

  342.             }

  343.         }

  344.     }

  345.     return 0;

  346. }

  347. 

  348. static int decode_slice(AVCodecContext *c, void *arg)

  349. {

  350.     FFV1Context *fs   = *(void **)arg;

  351.     FFV1Context *f    = fs->avctx->priv_data;

  352.     int width, height, x, y, ret;

  353.     const int ps      = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step_minus1 + 1;

  354.     AVFrame * const p = f->cur;

  355.     int i, si;

  356. 

  357.     for( si=0; fs != f->slice_context[si]; si ++)

  358.         ;

  359. 

  360.     if(f->fsrc && !p->key_frame)

  361.         ff_thread_await_progress(&f->last_picture, si, 0);

  362. 

  363.     if(f->fsrc && !p->key_frame) {

  364.         FFV1Context *fssrc = f->fsrc->slice_context[si];

  365.         FFV1Context *fsdst = f->slice_context[si];

  366.         av_assert1(fsdst->plane_count == fssrc->plane_count);

  367.         av_assert1(fsdst == fs);

  368. 

  369.         if (!p->key_frame)

  370.             fsdst->slice_damaged |= fssrc->slice_damaged;

  371. 

  372.         for (i = 0; i < f->plane_count; i++) {

  373.             PlaneContext *psrc = &fssrc->plane[i];

  374.             PlaneContext *pdst = &fsdst->plane[i];

  375. 

  376.             av_free(pdst->state);

  377.             av_free(pdst->vlc_state);

  378.             memcpy(pdst, psrc, sizeof(*pdst));

  379.             pdst->state = NULL;

  380.             pdst->vlc_state = NULL;

  381. 

  382.             if (fssrc->ac) {

  383.                 pdst->state = av_malloc_array(CONTEXT_SIZE,  psrc->context_count);

  384.                 memcpy(pdst->state, psrc->state, CONTEXT_SIZE * psrc->context_count);

  385.             } else {

  386.                 pdst->vlc_state = av_malloc_array(sizeof(*pdst->vlc_state), psrc->context_count);

  387.                 memcpy(pdst->vlc_state, psrc->vlc_state, sizeof(*pdst->vlc_state) * psrc->context_count);

  388.             }

  389.         }

  390.     }

  391. 

  392.     fs->slice_rct_by_coef = 1;

  393.     fs->slice_rct_ry_coef = 1;

  394. 

  395.     if (f->version > 2) {

  396.         if (ffv1_init_slice_state(f, fs) < 0)

  397.             return AVERROR(ENOMEM);

  398.         if (decode_slice_header(f, fs) < 0) {

  399.             fs->slice_damaged = 1;

  400.             return AVERROR_INVALIDDATA;

  401.         }

  402.     }

  403.     if ((ret = ffv1_init_slice_state(f, fs)) < 0)

  404.         return ret;

  405.     if (f->cur->key_frame || fs->slice_reset_contexts)

  406.         ffv1_clear_slice_state(f, fs);

  407. 

  408.     width  = fs->slice_width;

  409.     height = fs->slice_height;

  410.     x      = fs->slice_x;

  411.     y      = fs->slice_y;

  412. 

  413.     if (!fs->ac) {

  414.         if (f->version == 3 && f->micro_version > 1 || f->version > 3)

  415.             get_rac(&fs->c, (uint8_t[]) { 129 });

  416.         fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;

  417.         init_get_bits(&fs->gb,

  418.                       fs->c.bytestream_start + fs->ac_byte_count,

  419.                       (fs->c.bytestream_end - fs->c.bytestream_start - fs->ac_byte_count) * 8);

  420.     }

  421. 

  422.     av_assert1(width && height);

  423.     if (f->colorspace == 0) {

  424.         const int chroma_width  = FF_CEIL_RSHIFT(width,  f->chroma_h_shift);

  425.         const int chroma_height = FF_CEIL_RSHIFT(height, f->chroma_v_shift);

  426.         const int cx            = x >> f->chroma_h_shift;

  427.         const int cy            = y >> f->chroma_v_shift;

  428.         decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  429. 

  430.         if (f->chroma_planes) {

  431.             decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  432.             decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  433.         }

  434.         if (fs->transparency)

  435.             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  436.     } else {

  437.         uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0],

  438.                                p->data[1] + ps * x + y * p->linesize[1],

  439.                                p->data[2] + ps * x + y * p->linesize[2] };

  440.         decode_rgb_frame(fs, planes, width, height, p->linesize);

  441.     }

  442.     if (fs->ac && f->version > 2) {

  443.         int v;

  444.         get_rac(&fs->c, (uint8_t[]) { 129 });

  445.         v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5*f->ec;

  446.         if (v) {

  447.             av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v);

  448.             fs->slice_damaged = 1;

  449.         }

  450.     }

  451. 

  452.     emms_c();

  453. 

  454.     ff_thread_report_progress(&f->picture, si, 0);

  455. 

  456.     return 0;

  457. }

  458. 

  459. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)

  460. {

  461.     int v;

  462.     int i = 0;

  463.     uint8_t state[CONTEXT_SIZE];

  464. 

  465.     memset(state, 128, sizeof(state));

  466. 

  467.     for (v = 0; i < 128; v++) {

  468.         unsigned len = get_symbol(c, state, 0) + 1;

  469. 

  470.         if (len > 128 - i)

  471.             return AVERROR_INVALIDDATA;

  472. 

  473.         while (len--) {

  474.             quant_table[i] = scale * v;

  475.             i++;

  476.         }

  477.     }

  478. 

  479.     for (i = 1; i < 128; i++)

  480.         quant_table[256 - i] = -quant_table[i];

  481.     quant_table[128] = -quant_table[127];

  482. 

  483.     return 2 * v - 1;

  484. }

  485. 

  486. static int read_quant_tables(RangeCoder *c,

  487.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  488. {

  489.     int i;

  490.     int context_count = 1;

  491. 

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

  493.         context_count *= read_quant_table(c, quant_table[i], context_count);

  494.         if (context_count > 32768U) {

  495.             return AVERROR_INVALIDDATA;

  496.         }

  497.     }

  498.     return (context_count + 1) / 2;

  499. }

  500. 

  501. static int read_extra_header(FFV1Context *f)

  502. {

  503.     RangeCoder *const c = &f->c;

  504.     uint8_t state[CONTEXT_SIZE];

  505.     int i, j, k, ret;

  506.     uint8_t state2[32][CONTEXT_SIZE];

  507. 

  508.     memset(state2, 128, sizeof(state2));

  509.     memset(state, 128, sizeof(state));

  510. 

  511.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  512.     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

  513. 

  514.     f->version = get_symbol(c, state, 0);

  515.     if (f->version < 2) {

  516.         av_log(f->avctx, AV_LOG_ERROR, "Invalid version in global header\n");

  517.         return AVERROR_INVALIDDATA;

  518.     }

  519.     if (f->version > 2) {

  520.         c->bytestream_end -= 4;

  521.         f->micro_version = get_symbol(c, state, 0);

  522.     }

  523.     f->ac = f->avctx->coder_type = get_symbol(c, state, 0);

  524.     if (f->ac > 1) {

  525.         for (i = 1; i < 256; i++)

  526.             f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

  527.     }

  528. 

  529.     f->colorspace                 = get_symbol(c, state, 0); //YUV cs type

  530.     f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);

  531.     f->chroma_planes              = get_rac(c, state);

  532.     f->chroma_h_shift             = get_symbol(c, state, 0);

  533.     f->chroma_v_shift             = get_symbol(c, state, 0);

  534.     f->transparency               = get_rac(c, state);

  535.     f->plane_count                = 1 + (f->chroma_planes || f->version<4) + f->transparency;

  536.     f->num_h_slices               = 1 + get_symbol(c, state, 0);

  537.     f->num_v_slices               = 1 + get_symbol(c, state, 0);

  538. 

  539.     if (f->num_h_slices > (unsigned)f->width  || !f->num_h_slices ||

  540.         f->num_v_slices > (unsigned)f->height || !f->num_v_slices

  541.        ) {

  542.         av_log(f->avctx, AV_LOG_ERROR, "slice count invalid\n");

  543.         return AVERROR_INVALIDDATA;

  544.     }

  545. 

  546.     f->quant_table_count = get_symbol(c, state, 0);

  547.     if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  548.         return AVERROR_INVALIDDATA;

  549. 

  550.     for (i = 0; i < f->quant_table_count; i++) {

  551.         f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);

  552.         if (f->context_count[i] < 0) {

  553.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  554.             return AVERROR_INVALIDDATA;

  555.         }

  556.     }

  557.     if ((ret = ffv1_allocate_initial_states(f)) < 0)

  558.         return ret;

  559. 

  560.     for (i = 0; i < f->quant_table_count; i++)

  561.         if (get_rac(c, state)) {

  562.             for (j = 0; j < f->context_count[i]; j++)

  563.                 for (k = 0; k < CONTEXT_SIZE; k++) {

  564.                     int pred = j ? f->initial_states[i][j - 1][k] : 128;

  565.                     f->initial_states[i][j][k] =

  566.                         (pred + get_symbol(c, state2[k], 1)) & 0xFF;

  567.                 }

  568.         }

  569. 

  570.     if (f->version > 2) {

  571.         f->ec = get_symbol(c, state, 0);

  572.         if (f->micro_version > 2)

  573.             f->intra = get_symbol(c, state, 0);

  574.     }

  575. 

  576.     if (f->version > 2) {

  577.         unsigned v;

  578.         v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,

  579.                    f->avctx->extradata, f->avctx->extradata_size);

  580.         if (v) {

  581.             av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);

  582.             return AVERROR_INVALIDDATA;

  583.         }

  584.     }

  585. 

  586.     if (f->avctx->debug & FF_DEBUG_PICT_INFO)

  587.         av_log(f->avctx, AV_LOG_DEBUG,

  588.                "global: ver:%d.%d, coder:%d, colorspace: %d bpr:%d chroma:%d(%d:%d), alpha:%d slices:%dx%d qtabs:%d ec:%d intra:%d\n",

  589.                f->version, f->micro_version,

  590.                f->ac,

  591.                f->colorspace,

  592.                f->avctx->bits_per_raw_sample,

  593.                f->chroma_planes, f->chroma_h_shift, f->chroma_v_shift,

  594.                f->transparency,

  595.                f->num_h_slices, f->num_v_slices,

  596.                f->quant_table_count,

  597.                f->ec,

  598.                f->intra

  599.               );

  600.     return 0;

  601. }

  602. 

  603. static int read_header(FFV1Context *f)

  604. {

  605.     uint8_t state[CONTEXT_SIZE];

  606.     int i, j, context_count = -1; //-1 to avoid warning

  607.     RangeCoder *const c = &f->slice_context[0]->c;

  608. 

  609.     memset(state, 128, sizeof(state));

  610. 

  611.     if (f->version < 2) {

  612.         int chroma_planes, chroma_h_shift, chroma_v_shift, transparency, colorspace, bits_per_raw_sample;

  613.         unsigned v= get_symbol(c, state, 0);

  614.         if (v >= 2) {

  615.             av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in ver01 header\n", v);

  616.             return AVERROR_INVALIDDATA;

  617.         }

  618.         f->version = v;

  619.         f->ac      = f->avctx->coder_type = get_symbol(c, state, 0);

  620.         if (f->ac > 1) {

  621.             for (i = 1; i < 256; i++)

  622.                 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

  623.         }

  624. 

  625.         colorspace     = get_symbol(c, state, 0); //YUV cs type

  626.         bits_per_raw_sample = f->version > 0 ? get_symbol(c, state, 0) : f->avctx->bits_per_raw_sample;

  627.         chroma_planes  = get_rac(c, state);

  628.         chroma_h_shift = get_symbol(c, state, 0);

  629.         chroma_v_shift = get_symbol(c, state, 0);

  630.         transparency   = get_rac(c, state);

  631. 

  632.         if (f->plane_count) {

  633.             if (   colorspace    != f->colorspace

  634.                 || bits_per_raw_sample != f->avctx->bits_per_raw_sample

  635.                 || chroma_planes != f->chroma_planes

  636.                 || chroma_h_shift!= f->chroma_h_shift

  637.                 || chroma_v_shift!= f->chroma_v_shift

  638.                 || transparency  != f->transparency) {

  639.                 av_log(f->avctx, AV_LOG_ERROR, "Invalid change of global parameters\n");

  640.                 return AVERROR_INVALIDDATA;

  641.             }

  642.         }

  643. 

  644.         f->colorspace     = colorspace;

  645.         f->avctx->bits_per_raw_sample = bits_per_raw_sample;

  646.         f->chroma_planes  = chroma_planes;

  647.         f->chroma_h_shift = chroma_h_shift;

  648.         f->chroma_v_shift = chroma_v_shift;

  649.         f->transparency   = transparency;

  650. 

  651.         f->plane_count    = 2 + f->transparency;

  652.     }

  653. 

  654.     if (f->colorspace == 0) {

  655.         if (f->avctx->skip_alpha) f->transparency = 0;

  656.         if (!f->transparency && !f->chroma_planes) {

  657.             if (f->avctx->bits_per_raw_sample <= 8)

  658.                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;

  659.             else

  660.                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;

  661.         } else if (f->avctx->bits_per_raw_sample<=8 && !f->transparency) {

  662.             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

  663.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P; break;

  664.             case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P; break;

  665.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P; break;

  666.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P; break;

  667.             case 0x20: f->avctx->pix_fmt = AV_PIX_FMT_YUV411P; break;

  668.             case 0x22: f->avctx->pix_fmt = AV_PIX_FMT_YUV410P; break;

  669.             }

  670.         } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {

  671.             switch(16*f->chroma_h_shift + f->chroma_v_shift) {

  672.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P; break;

  673.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P; break;

  674.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P; break;

  675.             }

  676.         } else if (f->avctx->bits_per_raw_sample == 9 && !f->transparency) {

  677.             f->packed_at_lsb = 1;

  678.             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

  679.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9; break;

  680.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9; break;

  681.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9; break;

  682.             }

  683.         } else if (f->avctx->bits_per_raw_sample == 9 && f->transparency) {

  684.             f->packed_at_lsb = 1;

  685.             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

  686.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P9; break;

  687.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P9; break;

  688.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P9; break;

  689.             }

  690.         } else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency) {

  691.             f->packed_at_lsb = 1;

  692.             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

  693.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10; break;

  694.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10; break;

  695.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10; break;

  696.             }

  697.         } else if (f->avctx->bits_per_raw_sample == 10 && f->transparency) {

  698.             f->packed_at_lsb = 1;

  699.             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

  700.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P10; break;

  701.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P10; break;

  702.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P10; break;

  703.             }

  704.         } else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency){

  705.             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

  706.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16; break;

  707.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16; break;

  708.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16; break;

  709.             }

  710.         } else if (f->avctx->bits_per_raw_sample == 16 && f->transparency){

  711.             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

  712.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P16; break;

  713.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P16; break;

  714.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P16; break;

  715.             }

  716.         }

  717.     } else if (f->colorspace == 1) {

  718.         if (f->chroma_h_shift || f->chroma_v_shift) {

  719.             av_log(f->avctx, AV_LOG_ERROR,

  720.                    "chroma subsampling not supported in this colorspace\n");

  721.             return AVERROR(ENOSYS);

  722.         }

  723.         if (     f->avctx->bits_per_raw_sample ==  9)

  724.             f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;

  725.         else if (f->avctx->bits_per_raw_sample == 10)

  726.             f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;

  727.         else if (f->avctx->bits_per_raw_sample == 12)

  728.             f->avctx->pix_fmt = AV_PIX_FMT_GBRP12;

  729.         else if (f->avctx->bits_per_raw_sample == 14)

  730.             f->avctx->pix_fmt = AV_PIX_FMT_GBRP14;

  731.         else

  732.         if (f->transparency) f->avctx->pix_fmt = AV_PIX_FMT_RGB32;

  733.         else                 f->avctx->pix_fmt = AV_PIX_FMT_0RGB32;

  734.     } else {

  735.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  736.         return AVERROR(ENOSYS);

  737.     }

  738.     if (f->avctx->pix_fmt == AV_PIX_FMT_NONE) {

  739.         av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  740.         return AVERROR(ENOSYS);

  741.     }

  742. 

  743.     av_dlog(f->avctx, "%d %d %d\n",

  744.             f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);

  745.     if (f->version < 2) {

  746.         context_count = read_quant_tables(c, f->quant_table);

  747.         if (context_count < 0) {

  748.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  749.             return AVERROR_INVALIDDATA;

  750.         }

  751.     } else if (f->version < 3) {

  752.         f->slice_count = get_symbol(c, state, 0);

  753.     } else {

  754.         const uint8_t *p = c->bytestream_end;

  755.         for (f->slice_count = 0;

  756.              f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start;

  757.              f->slice_count++) {

  758.             int trailer = 3 + 5*!!f->ec;

  759.             int size = AV_RB24(p-trailer);

  760.             if (size + trailer > p - c->bytestream_start)

  761.                 break;

  762.             p -= size + trailer;

  763.         }

  764.     }

  765.     if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {

  766.         av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n", f->slice_count);

  767.         return AVERROR_INVALIDDATA;

  768.     }

  769. 

  770.     for (j = 0; j < f->slice_count; j++) {

  771.         FFV1Context *fs = f->slice_context[j];

  772.         fs->ac            = f->ac;

  773.         fs->packed_at_lsb = f->packed_at_lsb;

  774. 

  775.         fs->slice_damaged = 0;

  776. 

  777.         if (f->version == 2) {

  778.             fs->slice_x      =  get_symbol(c, state, 0)      * f->width ;

  779.             fs->slice_y      =  get_symbol(c, state, 0)      * f->height;

  780.             fs->slice_width  = (get_symbol(c, state, 0) + 1) * f->width  + fs->slice_x;

  781.             fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;

  782. 

  783.             fs->slice_x     /= f->num_h_slices;

  784.             fs->slice_y     /= f->num_v_slices;

  785.             fs->slice_width  = fs->slice_width  / f->num_h_slices - fs->slice_x;

  786.             fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;

  787.             if ((unsigned)fs->slice_width  > f->width ||

  788.                 (unsigned)fs->slice_height > f->height)

  789.                 return AVERROR_INVALIDDATA;

  790.             if (   (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  791.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  792.                 return AVERROR_INVALIDDATA;

  793.         }

  794. 

  795.         for (i = 0; i < f->plane_count; i++) {

  796.             PlaneContext *const p = &fs->plane[i];

  797. 

  798.             if (f->version == 2) {

  799.                 int idx = get_symbol(c, state, 0);

  800.                 if (idx > (unsigned)f->quant_table_count) {

  801.                     av_log(f->avctx, AV_LOG_ERROR,

  802.                            "quant_table_index out of range\n");

  803.                     return AVERROR_INVALIDDATA;

  804.                 }

  805.                 p->quant_table_index = idx;

  806.                 memcpy(p->quant_table, f->quant_tables[idx],

  807.                        sizeof(p->quant_table));

  808.                 context_count = f->context_count[idx];

  809.             } else {

  810.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  811.             }

  812. 

  813.             if (f->version <= 2) {

  814.                 av_assert0(context_count >= 0);

  815.                 if (p->context_count < context_count) {

  816.                     av_freep(&p->state);

  817.                     av_freep(&p->vlc_state);

  818.                 }

  819.                 p->context_count = context_count;

  820.             }

  821.         }

  822.     }

  823.     return 0;

  824. }

  825. 

  826. static av_cold int decode_init(AVCodecContext *avctx)

  827. {

  828.     FFV1Context *f = avctx->priv_data;

  829.     int ret;

  830. 

  831.     if ((ret = ffv1_common_init(avctx)) < 0)

  832.         return ret;

  833. 

  834.     if (avctx->extradata && (ret = read_extra_header(f)) < 0)

  835.         return ret;

  836. 

  837.     if ((ret = ffv1_init_slice_contexts(f)) < 0)

  838.         return ret;

  839. 

  840.     avctx->internal->allocate_progress = 1;

  841. 

  842.     return 0;

  843. }

  844. 

  845. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)

  846. {

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

  848.     int buf_size        = avpkt->size;

  849.     FFV1Context *f      = avctx->priv_data;

  850.     RangeCoder *const c = &f->slice_context[0]->c;

  851.     int i, ret;

  852.     uint8_t keystate = 128;

  853.     const uint8_t *buf_p;

  854.     AVFrame *p;

  855. 

  856.     if (f->last_picture.f)

  857.         ff_thread_release_buffer(avctx, &f->last_picture);

  858.     FFSWAP(ThreadFrame, f->picture, f->last_picture);

  859. 

  860.     f->cur = p = f->picture.f;

  861. 

  862.     if (f->version < 3 && avctx->field_order > AV_FIELD_PROGRESSIVE) {

  863.         /* we have interlaced material flagged in container */

  864.         p->interlaced_frame = 1;

  865.         if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)

  866.             p->top_field_first = 1;

  867.     }

  868. 

  869.     f->avctx = avctx;

  870.     ff_init_range_decoder(c, buf, buf_size);

  871.     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

  872. 

  873.     p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P

  874.     if (get_rac(c, &keystate)) {

  875.         p->key_frame    = 1;

  876.         f->key_frame_ok = 0;

  877.         if ((ret = read_header(f)) < 0)

  878.             return ret;

  879.         f->key_frame_ok = 1;

  880.     } else {

  881.         if (!f->key_frame_ok) {

  882.             av_log(avctx, AV_LOG_ERROR,

  883.                    "Cannot decode non-keyframe without valid keyframe\n");

  884.             return AVERROR_INVALIDDATA;

  885.         }

  886.         p->key_frame = 0;

  887.     }

  888. 

  889.     if ((ret = ff_thread_get_buffer(avctx, &f->picture, AV_GET_BUFFER_FLAG_REF)) < 0)

  890.         return ret;

  891. 

  892.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  893.         av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",

  894.                f->version, p->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);

  895. 

  896.     ff_thread_finish_setup(avctx);

  897. 

  898.     buf_p = buf + buf_size;

  899.     for (i = f->slice_count - 1; i >= 0; i--) {

  900.         FFV1Context *fs = f->slice_context[i];

  901.         int trailer = 3 + 5*!!f->ec;

  902.         int v;

  903. 

  904.         if (i || f->version > 2) v = AV_RB24(buf_p-trailer) + trailer;

  905.         else                     v = buf_p - c->bytestream_start;

  906.         if (buf_p - c->bytestream_start < v) {

  907.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  908.             return AVERROR_INVALIDDATA;

  909.         }

  910.         buf_p -= v;

  911. 

  912.         if (f->ec) {

  913.             unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);

  914.             if (crc) {

  915.                 int64_t ts = avpkt->pts != AV_NOPTS_VALUE ? avpkt->pts : avpkt->dts;

  916.                 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!", crc);

  917.                 if (ts != AV_NOPTS_VALUE && avctx->pkt_timebase.num) {

  918.                     av_log(f->avctx, AV_LOG_ERROR, "at %f seconds\n", ts*av_q2d(avctx->pkt_timebase));

  919.                 } else if (ts != AV_NOPTS_VALUE) {

  920.                     av_log(f->avctx, AV_LOG_ERROR, "at %"PRId64"\n", ts);

  921.                 } else {

  922.                     av_log(f->avctx, AV_LOG_ERROR, "\n");

  923.                 }

  924.                 fs->slice_damaged = 1;

  925.             }

  926.         }

  927. 

  928.         if (i) {

  929.             ff_init_range_decoder(&fs->c, buf_p, v);

  930.         } else

  931.             fs->c.bytestream_end = (uint8_t *)(buf_p + v);

  932. 

  933.         fs->avctx = avctx;

  934.         fs->cur = p;

  935.     }

  936. 

  937.     avctx->execute(avctx,

  938.                    decode_slice,

  939.                    &f->slice_context[0],

  940.                    NULL,

  941.                    f->slice_count,

  942.                    sizeof(void*));

  943. 

  944.     for (i = f->slice_count - 1; i >= 0; i--) {

  945.         FFV1Context *fs = f->slice_context[i];

  946.         int j;

  947.         if (fs->slice_damaged && f->last_picture.f->data[0]) {

  948.             const uint8_t *src[4];

  949.             uint8_t *dst[4];

  950.             ff_thread_await_progress(&f->last_picture, INT_MAX, 0);

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

  952.                 int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;

  953.                 int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;

  954.                 dst[j] = p->data[j] + p->linesize[j] *

  955.                          (fs->slice_y >> sv) + (fs->slice_x >> sh);

  956.                 src[j] = f->last_picture.f->data[j] + f->last_picture.f->linesize[j] *

  957.                          (fs->slice_y >> sv) + (fs->slice_x >> sh);

  958.             }

  959.             av_image_copy(dst, p->linesize, (const uint8_t **)src,

  960.                           f->last_picture.f->linesize,

  961.                           avctx->pix_fmt,

  962.                           fs->slice_width,

  963.                           fs->slice_height);

  964.         }

  965.     }

  966.     ff_thread_report_progress(&f->picture, INT_MAX, 0);

  967. 

  968.     f->picture_number++;

  969. 

  970.     if (f->last_picture.f)

  971.         ff_thread_release_buffer(avctx, &f->last_picture);

  972.     f->cur = NULL;

  973.     if ((ret = av_frame_ref(data, f->picture.f)) < 0)

  974.         return ret;

  975. 

  976.     *got_frame = 1;

  977. 

  978.     return buf_size;

  979. }

  980. 

  981. static int init_thread_copy(AVCodecContext *avctx)

  982. {

  983.     FFV1Context *f = avctx->priv_data;

  984.     int i, ret;

  985. 

  986.     f->picture.f      = NULL;

  987.     f->last_picture.f = NULL;

  988.     f->sample_buffer  = NULL;

  989.     f->slice_count = 0;

  990. 

  991.     for (i = 0; i < f->quant_table_count; i++) {

  992.         av_assert0(f->version > 1);

  993.         f->initial_states[i] = av_memdup(f->initial_states[i],

  994.                                          f->context_count[i] * sizeof(*f->initial_states[i]));

  995.     }

  996. 

  997.     f->picture.f      = av_frame_alloc();

  998.     f->last_picture.f = av_frame_alloc();

  999. 

  1000.     if ((ret = ffv1_init_slice_contexts(f)) < 0)

  1001.         return ret;

  1002. 

  1003.     return 0;

  1004. }

  1005. 

  1006. static void copy_fields(FFV1Context *fsdst, FFV1Context *fssrc, FFV1Context *fsrc)

  1007. {

  1008.     fsdst->version             = fsrc->version;

  1009.     fsdst->micro_version       = fsrc->micro_version;

  1010.     fsdst->chroma_planes       = fsrc->chroma_planes;

  1011.     fsdst->chroma_h_shift      = fsrc->chroma_h_shift;

  1012.     fsdst->chroma_v_shift      = fsrc->chroma_v_shift;

  1013.     fsdst->transparency        = fsrc->transparency;

  1014.     fsdst->plane_count         = fsrc->plane_count;

  1015.     fsdst->ac                  = fsrc->ac;

  1016.     fsdst->colorspace          = fsrc->colorspace;

  1017. 

  1018.     fsdst->ec                  = fsrc->ec;

  1019.     fsdst->intra               = fsrc->intra;

  1020.     fsdst->slice_damaged       = fssrc->slice_damaged;

  1021.     fsdst->key_frame_ok        = fsrc->key_frame_ok;

  1022. 

  1023.     fsdst->bits_per_raw_sample = fsrc->bits_per_raw_sample;

  1024.     fsdst->packed_at_lsb       = fsrc->packed_at_lsb;

  1025.     fsdst->slice_count         = fsrc->slice_count;

  1026.     if (fsrc->version<3){

  1027.         fsdst->slice_x             = fssrc->slice_x;

  1028.         fsdst->slice_y             = fssrc->slice_y;

  1029.         fsdst->slice_width         = fssrc->slice_width;

  1030.         fsdst->slice_height        = fssrc->slice_height;

  1031.     }

  1032. }

  1033. 

  1034. static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1035. {

  1036.     FFV1Context *fsrc = src->priv_data;

  1037.     FFV1Context *fdst = dst->priv_data;

  1038.     int i, ret;

  1039. 

  1040.     if (dst == src)

  1041.         return 0;

  1042. 

  1043.     {

  1044.         FFV1Context bak = *fdst;

  1045.         memcpy(fdst, fsrc, sizeof(*fdst));

  1046.         memcpy(fdst->initial_states, bak.initial_states, sizeof(fdst->initial_states));

  1047.         memcpy(fdst->slice_context,  bak.slice_context , sizeof(fdst->slice_context));

  1048.         fdst->picture      = bak.picture;

  1049.         fdst->last_picture = bak.last_picture;

  1050.         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

  1051.             FFV1Context *fssrc = fsrc->slice_context[i];

  1052.             FFV1Context *fsdst = fdst->slice_context[i];

  1053.             copy_fields(fsdst, fssrc, fsrc);

  1054.         }

  1055.         av_assert0(!fdst->plane[0].state);

  1056.         av_assert0(!fdst->sample_buffer);

  1057.     }

  1058. 

  1059.     av_assert1(fdst->slice_count == fsrc->slice_count);

  1060. 

  1061. 

  1062.     ff_thread_release_buffer(dst, &fdst->picture);

  1063.     if (fsrc->picture.f->data[0]) {

  1064.         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

  1065.             return ret;

  1066.     }

  1067. 

  1068.     fdst->fsrc = fsrc;

  1069. 

  1070.     return 0;

  1071. }

  1072. 

  1073. AVCodec ff_ffv1_decoder = {

  1074.     .name           = "ffv1",

  1075.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1076.     .type           = AVMEDIA_TYPE_VIDEO,

  1077.     .id             = AV_CODEC_ID_FFV1,

  1078.     .priv_data_size = sizeof(FFV1Context),

  1079.     .init           = decode_init,

  1080.     .close          = ffv1_close,

  1081.     .decode         = decode_frame,

  1082.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),

  1083.     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

  1084.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1085.                       CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,

  1086. };