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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 + r) >> 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.     }

  337.     return 0;

  338. }

  339. 

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

  341. {

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

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

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

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

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

  347.     int i, si;

  348. 

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

  350.         ;

  351. 

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

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

  354. 

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

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

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

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

  359.         av_assert1(fsdst == fs);

  360. 

  361.         if (!p->key_frame)

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

  363. 

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

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

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

  367. 

  368.             av_free(pdst->state);

  369.             av_free(pdst->vlc_state);

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

  371.             pdst->state = NULL;

  372.             pdst->vlc_state = NULL;

  373. 

  374.             if (fssrc->ac) {

  375.                 pdst->state = av_malloc(CONTEXT_SIZE * psrc->context_count);

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

  377.             } else {

  378.                 pdst->vlc_state = av_malloc(sizeof(*pdst->vlc_state) * psrc->context_count);

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

  380.             }

  381.         }

  382.     }

  383. 

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

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

  386.             return AVERROR(ENOMEM);

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

  388.             fs->slice_damaged = 1;

  389.             return AVERROR_INVALIDDATA;

  390.         }

  391.     }

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

  393.         return ret;

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

  395.         ffv1_clear_slice_state(f, fs);

  396. 

  397.     width  = fs->slice_width;

  398.     height = fs->slice_height;

  399.     x      = fs->slice_x;

  400.     y      = fs->slice_y;

  401. 

  402.     if (!fs->ac) {

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

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

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

  406.         init_get_bits(&fs->gb,

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

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

  409.     }

  410. 

  411.     av_assert1(width && height);

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

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

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

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

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

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

  418. 

  419.         if (f->chroma_planes) {

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

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

  422.         }

  423.         if (fs->transparency)

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

  425.     } else {

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

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

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

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

  430.     }

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

  432.         int v;

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

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

  435.         if (v) {

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

  437.             fs->slice_damaged = 1;

  438.         }

  439.     }

  440. 

  441.     emms_c();

  442. 

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

  444. 

  445.     return 0;

  446. }

  447. 

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

  449. {

  450.     int v;

  451.     int i = 0;

  452.     uint8_t state[CONTEXT_SIZE];

  453. 

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

  455. 

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

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

  458. 

  459.         if (len > 128 - i)

  460.             return AVERROR_INVALIDDATA;

  461. 

  462.         while (len--) {

  463.             quant_table[i] = scale * v;

  464.             i++;

  465.         }

  466.     }

  467. 

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

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

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

  471. 

  472.     return 2 * v - 1;

  473. }

  474. 

  475. static int read_quant_tables(RangeCoder *c,

  476.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  477. {

  478.     int i;

  479.     int context_count = 1;

  480. 

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

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

  483.         if (context_count > 32768U) {

  484.             return AVERROR_INVALIDDATA;

  485.         }

  486.     }

  487.     return (context_count + 1) / 2;

  488. }

  489. 

  490. static int read_extra_header(FFV1Context *f)

  491. {

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

  493.     uint8_t state[CONTEXT_SIZE];

  494.     int i, j, k, ret;

  495.     uint8_t state2[32][CONTEXT_SIZE];

  496. 

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

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

  499. 

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

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

  502. 

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

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

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

  506.         return AVERROR_INVALIDDATA;

  507.     }

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

  509.         c->bytestream_end -= 4;

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

  511.     }

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

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

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

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

  516.     }

  517. 

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

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

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

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

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

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

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

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

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

  527. 

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

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

  530.        ) {

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

  532.         return AVERROR_INVALIDDATA;

  533.     }

  534. 

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

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

  537.         return AVERROR_INVALIDDATA;

  538. 

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

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

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

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

  543.             return AVERROR_INVALIDDATA;

  544.         }

  545.     }

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

  547.         return ret;

  548. 

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

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

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

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

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

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

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

  556.                 }

  557.         }

  558. 

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

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

  561.         if (f->micro_version > 2)

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

  563.     }

  564. 

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

  566.         unsigned v;

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

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

  569.         if (v) {

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

  571.             return AVERROR_INVALIDDATA;

  572.         }

  573.     }

  574. 

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

  576.         av_log(f->avctx, AV_LOG_DEBUG,

  577.                "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",

  578.                f->version, f->micro_version,

  579.                f->ac,

  580.                f->colorspace,

  581.                f->avctx->bits_per_raw_sample,

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

  583.                f->transparency,

  584.                f->num_h_slices, f->num_v_slices,

  585.                f->quant_table_count,

  586.                f->ec,

  587.                f->intra

  588.               );

  589.     return 0;

  590. }

  591. 

  592. static int read_header(FFV1Context *f)

  593. {

  594.     uint8_t state[CONTEXT_SIZE];

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

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

  597. 

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

  599. 

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

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

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

  603.         if (v >= 2) {

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

  605.             return AVERROR_INVALIDDATA;

  606.         }

  607.         f->version = v;

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

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

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

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

  612.         }

  613. 

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

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

  616.         chroma_planes  = get_rac(c, state);

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

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

  619.         transparency   = get_rac(c, state);

  620. 

  621.         if (f->plane_count) {

  622.             if (   colorspace    != f->colorspace

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

  624.                 || chroma_planes != f->chroma_planes

  625.                 || chroma_h_shift!= f->chroma_h_shift

  626.                 || chroma_v_shift!= f->chroma_v_shift

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

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

  629.                 return AVERROR_INVALIDDATA;

  630.             }

  631.         }

  632. 

  633.         f->colorspace     = colorspace;

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

  635.         f->chroma_planes  = chroma_planes;

  636.         f->chroma_h_shift = chroma_h_shift;

  637.         f->chroma_v_shift = chroma_v_shift;

  638.         f->transparency   = transparency;

  639. 

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

  641.     }

  642. 

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

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

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

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

  647.             else

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

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

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

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

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

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

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

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

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

  657.             }

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

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

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

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

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

  663.             }

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

  665.             f->packed_at_lsb = 1;

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

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

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

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

  670.             }

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

  672.             f->packed_at_lsb = 1;

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

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

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

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

  677.             }

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

  679.             f->packed_at_lsb = 1;

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

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

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

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

  684.             }

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

  686.             f->packed_at_lsb = 1;

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

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

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

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

  691.             }

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

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

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

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

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

  697.             }

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

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

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

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

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

  703.             }

  704.         }

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

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

  707.             av_log(f->avctx, AV_LOG_ERROR,

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

  709.             return AVERROR(ENOSYS);

  710.         }

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

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

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

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

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

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

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

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

  719.         else

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

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

  722.     } else {

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

  724.         return AVERROR(ENOSYS);

  725.     }

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

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

  728.         return AVERROR(ENOSYS);

  729.     }

  730. 

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

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

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

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

  735.         if (context_count < 0) {

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

  737.             return AVERROR_INVALIDDATA;

  738.         }

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

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

  741.     } else {

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

  743.         for (f->slice_count = 0;

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

  745.              f->slice_count++) {

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

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

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

  749.                 break;

  750.             p -= size + trailer;

  751.         }

  752.     }

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

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

  755.         return AVERROR_INVALIDDATA;

  756.     }

  757. 

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

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

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

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

  762. 

  763.         fs->slice_damaged = 0;

  764. 

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

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

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

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

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

  770. 

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

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

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

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

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

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

  777.                 return AVERROR_INVALIDDATA;

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

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

  780.                 return AVERROR_INVALIDDATA;

  781.         }

  782. 

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

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

  785. 

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

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

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

  789.                     av_log(f->avctx, AV_LOG_ERROR,

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

  791.                     return AVERROR_INVALIDDATA;

  792.                 }

  793.                 p->quant_table_index = idx;

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

  795.                        sizeof(p->quant_table));

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

  797.             } else {

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

  799.             }

  800. 

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

  802.                 av_assert0(context_count >= 0);

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

  804.                     av_freep(&p->state);

  805.                     av_freep(&p->vlc_state);

  806.                 }

  807.                 p->context_count = context_count;

  808.             }

  809.         }

  810.     }

  811.     return 0;

  812. }

  813. 

  814. static av_cold int decode_init(AVCodecContext *avctx)

  815. {

  816.     FFV1Context *f = avctx->priv_data;

  817.     int ret;

  818. 

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

  820.         return ret;

  821. 

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

  823.         return ret;

  824. 

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

  826.         return ret;

  827. 

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

  829. 

  830.     return 0;

  831. }

  832. 

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

  834. {

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

  836.     int buf_size        = avpkt->size;

  837.     FFV1Context *f      = avctx->priv_data;

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

  839.     int i, ret;

  840.     uint8_t keystate = 128;

  841.     const uint8_t *buf_p;

  842.     AVFrame *p;

  843. 

  844.     if (f->last_picture.f)

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

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

  847. 

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

  849. 

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

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

  852.         p->interlaced_frame = 1;

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

  854.             p->top_field_first = 1;

  855.     }

  856. 

  857.     f->avctx = avctx;

  858.     ff_init_range_decoder(c, buf, buf_size);

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

  860. 

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

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

  863.         p->key_frame    = 1;

  864.         f->key_frame_ok = 0;

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

  866.             return ret;

  867.         f->key_frame_ok = 1;

  868.     } else {

  869.         if (!f->key_frame_ok) {

  870.             av_log(avctx, AV_LOG_ERROR,

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

  872.             return AVERROR_INVALIDDATA;

  873.         }

  874.         p->key_frame = 0;

  875.     }

  876. 

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

  878.         return ret;

  879. 

  880.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  883. 

  884.     ff_thread_finish_setup(avctx);

  885. 

  886.     buf_p = buf + buf_size;

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

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

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

  890.         int v;

  891. 

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

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

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

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

  896.             return AVERROR_INVALIDDATA;

  897.         }

  898.         buf_p -= v;

  899. 

  900.         if (f->ec) {

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

  902.             if (crc) {

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

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

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

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

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

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

  909.                 } else {

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

  911.                 }

  912.                 fs->slice_damaged = 1;

  913.             }

  914.         }

  915. 

  916.         if (i) {

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

  918.         } else

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

  920. 

  921.         fs->avctx = avctx;

  922.         fs->cur = p;

  923.     }

  924. 

  925.     avctx->execute(avctx,

  926.                    decode_slice,

  927.                    &f->slice_context[0],

  928.                    NULL,

  929.                    f->slice_count,

  930.                    sizeof(void*));

  931. 

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

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

  934.         int j;

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

  936.             const uint8_t *src[4];

  937.             uint8_t *dst[4];

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

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

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

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

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

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

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

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

  946.             }

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

  948.                           f->last_picture.f->linesize,

  949.                           avctx->pix_fmt,

  950.                           fs->slice_width,

  951.                           fs->slice_height);

  952.         }

  953.     }

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

  955. 

  956.     f->picture_number++;

  957. 

  958.     if (f->last_picture.f)

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

  960.     f->cur = NULL;

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

  962.         return ret;

  963. 

  964.     *got_frame = 1;

  965. 

  966.     return buf_size;

  967. }

  968. 

  969. static int init_thread_copy(AVCodecContext *avctx)

  970. {

  971.     FFV1Context *f = avctx->priv_data;

  972.     int i, ret;

  973. 

  974.     f->picture.f      = NULL;

  975.     f->last_picture.f = NULL;

  976.     f->sample_buffer  = NULL;

  977.     f->slice_count = 0;

  978. 

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

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

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

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

  983.     }

  984. 

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

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

  987. 

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

  989.         return ret;

  990. 

  991.     return 0;

  992. }

  993. 

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

  995. {

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

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

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

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

  1000.     fsdst->chroma_v_shift      = fsrc->chroma_v_shift;

  1001.     fsdst->transparency        = fsrc->transparency;

  1002.     fsdst->plane_count         = fsrc->plane_count;

  1003.     fsdst->ac                  = fsrc->ac;

  1004.     fsdst->colorspace          = fsrc->colorspace;

  1005. 

  1006.     fsdst->ec                  = fsrc->ec;

  1007.     fsdst->intra               = fsrc->intra;

  1008.     fsdst->slice_damaged       = fssrc->slice_damaged;

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

  1010. 

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

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

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

  1014.     if (fsrc->version<3){

  1015.         fsdst->slice_x             = fssrc->slice_x;

  1016.         fsdst->slice_y             = fssrc->slice_y;

  1017.         fsdst->slice_width         = fssrc->slice_width;

  1018.         fsdst->slice_height        = fssrc->slice_height;

  1019.     }

  1020. }

  1021. 

  1022. static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1023. {

  1024.     FFV1Context *fsrc = src->priv_data;

  1025.     FFV1Context *fdst = dst->priv_data;

  1026.     int i, ret;

  1027. 

  1028.     if (dst == src)

  1029.         return 0;

  1030. 

  1031.     {

  1032.         FFV1Context bak = *fdst;

  1033.         memcpy(fdst, fsrc, sizeof(*fdst));

  1034.         memcpy(fdst->initial_states, bak.initial_states, sizeof(fdst->initial_states));

  1035.         memcpy(fdst->slice_context,  bak.slice_context , sizeof(fdst->slice_context));

  1036.         fdst->picture      = bak.picture;

  1037.         fdst->last_picture = bak.last_picture;

  1038.         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

  1039.             FFV1Context *fssrc = fsrc->slice_context[i];

  1040.             FFV1Context *fsdst = fdst->slice_context[i];

  1041.             copy_fields(fsdst, fssrc, fsrc);

  1042.         }

  1043.         av_assert0(!fdst->plane[0].state);

  1044.         av_assert0(!fdst->sample_buffer);

  1045.     }

  1046. 

  1047.     av_assert1(fdst->slice_count == fsrc->slice_count);

  1048. 

  1049. 

  1050.     ff_thread_release_buffer(dst, &fdst->picture);

  1051.     if (fsrc->picture.f->data[0]) {

  1052.         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

  1053.             return ret;

  1054.     }

  1055. 

  1056.     fdst->fsrc = fsrc;

  1057. 

  1058.     return 0;

  1059. }

  1060. 

  1061. AVCodec ff_ffv1_decoder = {

  1062.     .name           = "ffv1",

  1063.     .type           = AVMEDIA_TYPE_VIDEO,

  1064.     .id             = AV_CODEC_ID_FFV1,

  1065.     .priv_data_size = sizeof(FFV1Context),

  1066.     .init           = decode_init,

  1067.     .close          = ffv1_close,

  1068.     .decode         = decode_frame,

  1069.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),

  1070.     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

  1071.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1072.                       CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,

  1073.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1074. };