falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67196 Commits
32 Branches
743MB
Tree: ac19d8eb3a
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'ac19d8eb3a'
${ noResults }
FFmpeg/libavcodec/ffv1dec.c

1117 lines
39KB
Raw Blame History 

  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.             if (e > 31)

  53.                 return AVERROR_INVALIDDATA;

  54.         }

  55. 

  56.         a = 1;

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

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

  59. 

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

  61.         return (a ^ e) - e;

  62.     }

  63. }

  64. 

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

  66. {

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

  68. }

  69. 

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

  71.                                  int bits)

  72. {

  73.     int k, i, v, ret;

  74. 

  75.     i = state->count;

  76.     k = 0;

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

  78.         k++;

  79.         i += i;

  80.     }

  81. 

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

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

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

  85. 

  86. #if 0 // JPEG LS

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

  88.         v ^= (-1);

  89. #else

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

  91. #endif

  92. 

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

  94. 

  95.     update_vlc_state(state, v);

  96. 

  97.     return ret;

  98. }

  99. 

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

  101.                                          int16_t *sample[2],

  102.                                          int plane_index, int bits)

  103. {

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

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

  106.     int x;

  107.     int run_count = 0;

  108.     int run_mode  = 0;

  109.     int run_index = s->run_index;

  110. 

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

  112.         int i;

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

  114.             int v = 0;

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

  116.                 uint8_t state = 128;

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

  118.             }

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

  120.         }

  121.         return;

  122.     }

  123. 

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

  125.         int diff, context, sign;

  126. 

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

  128.         if (context < 0) {

  129.             context = -context;

  130.             sign    = 1;

  131.         } else

  132.             sign = 0;

  133. 

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

  135. 

  136.         if (s->ac) {

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

  138.         } else {

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

  140.                 run_mode = 1;

  141. 

  142.             if (run_mode) {

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

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

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

  146.                         if (x + run_count <= w)

  147.                             run_index++;

  148.                     } else {

  149.                         if (ff_log2_run[run_index])

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

  151.                         else

  152.                             run_count = 0;

  153.                         if (run_index)

  154.                             run_index--;

  155.                         run_mode = 2;

  156.                     }

  157.                 }

  158.                 run_count--;

  159.                 if (run_count < 0) {

  160.                     run_mode  = 0;

  161.                     run_count = 0;

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

  163.                                                bits);

  164.                     if (diff >= 0)

  165.                         diff++;

  166.                 } else

  167.                     diff = 0;

  168.             } else

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

  170. 

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

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

  173.         }

  174. 

  175.         if (sign)

  176.             diff = -diff;

  177. 

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

  179.                        ((1 << bits) - 1);

  180.     }

  181.     s->run_index = run_index;

  182. }

  183. 

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

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

  186. {

  187.     int x, y;

  188.     int16_t *sample[2];

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

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

  191. 

  192.     s->run_index = 0;

  193. 

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

  195. 

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

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

  198. 

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

  200.         sample[1] = temp;

  201. 

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

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

  204. 

  205. // { START_TIMER

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

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

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

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

  210.         } else {

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

  212.             if (s->packed_at_lsb) {

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

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

  215.                 }

  216.             } else {

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

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

  219.                 }

  220.             }

  221.         }

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

  223.     }

  224. }

  225. 

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

  227. {

  228.     int x, y, p;

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

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

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

  232.     int offset = 1 << bits;

  233. 

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

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

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

  237.     }

  238. 

  239.     s->run_index = 0;

  240. 

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

  242. 

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

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

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

  246. 

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

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

  249. 

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

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

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

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

  254.             else

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

  256.         }

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

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

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

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

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

  262. 

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

  264.                 b -= offset;

  265.                 r -= offset;

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

  267.                 b += g;

  268.                 r += g;

  269.             }

  270. 

  271.             if (lbd)

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

  273.             else {

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

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

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

  277.             }

  278.         }

  279.     }

  280. }

  281. 

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

  283. {

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

  285.     uint8_t state[CONTEXT_SIZE];

  286.     unsigned ps, i, context_count;

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

  288. 

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

  290. 

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

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

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

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

  295. 

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

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

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

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

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

  301.         return -1;

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

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

  304.         return -1;

  305. 

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

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

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

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

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

  311.             return -1;

  312.         }

  313.         p->quant_table_index = idx;

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

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

  316. 

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

  318.             av_freep(&p->state);

  319.             av_freep(&p->vlc_state);

  320.         }

  321.         p->context_count = context_count;

  322.     }

  323. 

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

  325.     if (ps == 1) {

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

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

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

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

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

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

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

  333.     }

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

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

  336. 

  337.     if (av_image_check_sar(f->width, f->height,

  338.                            f->cur->sample_aspect_ratio) < 0) {

  339.         av_log(f->avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",

  340.                f->cur->sample_aspect_ratio.num,

  341.                f->cur->sample_aspect_ratio.den);

  342.         f->cur->sample_aspect_ratio = (AVRational){ 0, 1 };

  343.     }

  344. 

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

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

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

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

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

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

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

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

  353.                 return AVERROR_INVALIDDATA;

  354.             }

  355.         }

  356.     }

  357. 

  358.     return 0;

  359. }

  360. 

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

  362. {

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

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

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

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

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

  368.     int i, si;

  369. 

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

  371.         ;

  372. 

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

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

  375. 

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

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

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

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

  380.         av_assert1(fsdst == fs);

  381. 

  382.         if (!p->key_frame)

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

  384. 

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

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

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

  388. 

  389.             av_free(pdst->state);

  390.             av_free(pdst->vlc_state);

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

  392.             pdst->state = NULL;

  393.             pdst->vlc_state = NULL;

  394. 

  395.             if (fssrc->ac) {

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

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

  398.             } else {

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

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

  401.             }

  402.         }

  403.     }

  404. 

  405.     fs->slice_rct_by_coef = 1;

  406.     fs->slice_rct_ry_coef = 1;

  407. 

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

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

  410.             return AVERROR(ENOMEM);

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

  412.             fs->slice_damaged = 1;

  413.             return AVERROR_INVALIDDATA;

  414.         }

  415.     }

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

  417.         return ret;

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

  419.         ffv1_clear_slice_state(f, fs);

  420. 

  421.     width  = fs->slice_width;

  422.     height = fs->slice_height;

  423.     x      = fs->slice_x;

  424.     y      = fs->slice_y;

  425. 

  426.     if (!fs->ac) {

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

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

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

  430.         init_get_bits(&fs->gb,

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

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

  433.     }

  434. 

  435.     av_assert1(width && height);

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

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

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

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

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

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

  442. 

  443.         if (f->chroma_planes) {

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

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

  446.         }

  447.         if (fs->transparency)

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

  449.     } else {

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

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

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

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

  454.     }

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

  456.         int v;

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

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

  459.         if (v) {

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

  461.             fs->slice_damaged = 1;

  462.         }

  463.     }

  464. 

  465.     emms_c();

  466. 

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

  468. 

  469.     return 0;

  470. }

  471. 

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

  473. {

  474.     int v;

  475.     int i = 0;

  476.     uint8_t state[CONTEXT_SIZE];

  477. 

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

  479. 

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

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

  482. 

  483.         if (len > 128 - i)

  484.             return AVERROR_INVALIDDATA;

  485. 

  486.         while (len--) {

  487.             quant_table[i] = scale * v;

  488.             i++;

  489.         }

  490.     }

  491. 

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

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

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

  495. 

  496.     return 2 * v - 1;

  497. }

  498. 

  499. static int read_quant_tables(RangeCoder *c,

  500.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  501. {

  502.     int i;

  503.     int context_count = 1;

  504. 

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

  506.         int ret = read_quant_table(c, quant_table[i], context_count);

  507.         if (ret < 0)

  508.             return ret;

  509.         context_count *= ret;

  510.         if (context_count > 32768U) {

  511.             return AVERROR_INVALIDDATA;

  512.         }

  513.     }

  514.     return (context_count + 1) / 2;

  515. }

  516. 

  517. static int read_extra_header(FFV1Context *f)

  518. {

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

  520.     uint8_t state[CONTEXT_SIZE];

  521.     int i, j, k, ret;

  522.     uint8_t state2[32][CONTEXT_SIZE];

  523. 

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

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

  526. 

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

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

  529. 

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

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

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

  533.         return AVERROR_INVALIDDATA;

  534.     }

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

  536.         c->bytestream_end -= 4;

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

  538.     }

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

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

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

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

  543.     }

  544. 

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

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

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

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

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

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

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

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

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

  554. 

  555.     if (f->chroma_h_shift > 4U || f->chroma_v_shift > 4U) {

  556.         av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",

  557.                f->chroma_h_shift, f->chroma_v_shift);

  558.         return AVERROR_INVALIDDATA;

  559.     }

  560. 

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

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

  563.        ) {

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

  565.         return AVERROR_INVALIDDATA;

  566.     }

  567. 

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

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

  570.         return AVERROR_INVALIDDATA;

  571. 

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

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

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

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

  576.             return AVERROR_INVALIDDATA;

  577.         }

  578.     }

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

  580.         return ret;

  581. 

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

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

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

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

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

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

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

  589.                 }

  590.         }

  591. 

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

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

  594.         if (f->micro_version > 2)

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

  596.     }

  597. 

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

  599.         unsigned v;

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

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

  602.         if (v) {

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

  604.             return AVERROR_INVALIDDATA;

  605.         }

  606.     }

  607. 

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

  609.         av_log(f->avctx, AV_LOG_DEBUG,

  610.                "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",

  611.                f->version, f->micro_version,

  612.                f->ac,

  613.                f->colorspace,

  614.                f->avctx->bits_per_raw_sample,

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

  616.                f->transparency,

  617.                f->num_h_slices, f->num_v_slices,

  618.                f->quant_table_count,

  619.                f->ec,

  620.                f->intra

  621.               );

  622.     return 0;

  623. }

  624. 

  625. static int read_header(FFV1Context *f)

  626. {

  627.     uint8_t state[CONTEXT_SIZE];

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

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

  630. 

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

  632. 

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

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

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

  636.         if (v >= 2) {

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

  638.             return AVERROR_INVALIDDATA;

  639.         }

  640.         f->version = v;

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

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

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

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

  645.         }

  646. 

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

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

  649.         chroma_planes       = get_rac(c, state);

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

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

  652.         transparency        = get_rac(c, state);

  653. 

  654.         if (f->plane_count) {

  655.             if (colorspace          != f->colorspace                 ||

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

  657.                 chroma_planes       != f->chroma_planes              ||

  658.                 chroma_h_shift      != f->chroma_h_shift             ||

  659.                 chroma_v_shift      != f->chroma_v_shift             ||

  660.                 transparency        != f->transparency) {

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

  662.                 return AVERROR_INVALIDDATA;

  663.             }

  664.         }

  665. 

  666.         if (chroma_h_shift > 4U || chroma_v_shift > 4U) {

  667.             av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",

  668.                    chroma_h_shift, chroma_v_shift);

  669.             return AVERROR_INVALIDDATA;

  670.         }

  671. 

  672.         f->colorspace                 = colorspace;

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

  674.         f->chroma_planes              = chroma_planes;

  675.         f->chroma_h_shift             = chroma_h_shift;

  676.         f->chroma_v_shift             = chroma_v_shift;

  677.         f->transparency               = transparency;

  678. 

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

  680.     }

  681. 

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

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

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

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

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

  687.             else

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

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

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

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

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

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

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

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

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

  697.             }

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

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

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

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

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

  703.             }

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

  705.             f->packed_at_lsb = 1;

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

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

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

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

  710.             }

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

  712.             f->packed_at_lsb = 1;

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

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

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

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

  717.             }

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

  719.             f->packed_at_lsb = 1;

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

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

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

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

  724.             }

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

  726.             f->packed_at_lsb = 1;

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

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

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

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

  731.             }

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

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

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

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

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

  737.             }

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

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

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

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

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

  743.             }

  744.         }

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

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

  747.             av_log(f->avctx, AV_LOG_ERROR,

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

  749.             return AVERROR(ENOSYS);

  750.         }

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

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

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

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

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

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

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

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

  759.         else

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

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

  762.     } else {

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

  764.         return AVERROR(ENOSYS);

  765.     }

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

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

  768.         return AVERROR(ENOSYS);

  769.     }

  770. 

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

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

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

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

  775.         if (context_count < 0) {

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

  777.             return AVERROR_INVALIDDATA;

  778.         }

  779.         f->slice_count = f->max_slice_count;

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

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

  782.     } else {

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

  784.         for (f->slice_count = 0;

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

  786.              f->slice_count++) {

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

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

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

  790.                 break;

  791.             p -= size + trailer;

  792.         }

  793.     }

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

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

  796.         return AVERROR_INVALIDDATA;

  797.     }

  798. 

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

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

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

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

  803. 

  804.         fs->slice_damaged = 0;

  805. 

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

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

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

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

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

  811. 

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

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

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

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

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

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

  818.                 return AVERROR_INVALIDDATA;

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

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

  821.                 return AVERROR_INVALIDDATA;

  822.         }

  823. 

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

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

  826. 

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

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

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

  830.                     av_log(f->avctx, AV_LOG_ERROR,

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

  832.                     return AVERROR_INVALIDDATA;

  833.                 }

  834.                 p->quant_table_index = idx;

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

  836.                        sizeof(p->quant_table));

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

  838.             } else {

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

  840.             }

  841. 

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

  843.                 av_assert0(context_count >= 0);

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

  845.                     av_freep(&p->state);

  846.                     av_freep(&p->vlc_state);

  847.                 }

  848.                 p->context_count = context_count;

  849.             }

  850.         }

  851.     }

  852.     return 0;

  853. }

  854. 

  855. static av_cold int decode_init(AVCodecContext *avctx)

  856. {

  857.     FFV1Context *f = avctx->priv_data;

  858.     int ret;

  859. 

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

  861.         return ret;

  862. 

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

  864.         return ret;

  865. 

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

  867.         return ret;

  868. 

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

  870. 

  871.     return 0;

  872. }

  873. 

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

  875. {

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

  877.     int buf_size        = avpkt->size;

  878.     FFV1Context *f      = avctx->priv_data;

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

  880.     int i, ret;

  881.     uint8_t keystate = 128;

  882.     const uint8_t *buf_p;

  883.     AVFrame *p;

  884. 

  885.     if (f->last_picture.f)

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

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

  888. 

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

  890. 

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

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

  893.         p->interlaced_frame = 1;

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

  895.             p->top_field_first = 1;

  896.     }

  897. 

  898.     f->avctx = avctx;

  899.     ff_init_range_decoder(c, buf, buf_size);

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

  901. 

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

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

  904.         p->key_frame    = 1;

  905.         f->key_frame_ok = 0;

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

  907.             return ret;

  908.         f->key_frame_ok = 1;

  909.     } else {

  910.         if (!f->key_frame_ok) {

  911.             av_log(avctx, AV_LOG_ERROR,

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

  913.             return AVERROR_INVALIDDATA;

  914.         }

  915.         p->key_frame = 0;

  916.     }

  917. 

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

  919.         return ret;

  920. 

  921.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  924. 

  925.     ff_thread_finish_setup(avctx);

  926. 

  927.     buf_p = buf + buf_size;

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

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

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

  931.         int v;

  932. 

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

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

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

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

  937.             return AVERROR_INVALIDDATA;

  938.         }

  939.         buf_p -= v;

  940. 

  941.         if (f->ec) {

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

  943.             if (crc) {

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

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

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

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

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

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

  950.                 } else {

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

  952.                 }

  953.                 fs->slice_damaged = 1;

  954.             }

  955.         }

  956. 

  957.         if (i) {

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

  959.         } else

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

  961. 

  962.         fs->avctx = avctx;

  963.         fs->cur = p;

  964.     }

  965. 

  966.     avctx->execute(avctx,

  967.                    decode_slice,

  968.                    &f->slice_context[0],

  969.                    NULL,

  970.                    f->slice_count,

  971.                    sizeof(void*));

  972. 

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

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

  975.         int j;

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

  977.             const uint8_t *src[4];

  978.             uint8_t *dst[4];

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

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

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

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

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

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

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

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

  987.             }

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

  989.                           f->last_picture.f->linesize,

  990.                           avctx->pix_fmt,

  991.                           fs->slice_width,

  992.                           fs->slice_height);

  993.         }

  994.     }

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

  996. 

  997.     f->picture_number++;

  998. 

  999.     if (f->last_picture.f)

  1000.         ff_thread_release_buffer(avctx, &f->last_picture);

  1001.     f->cur = NULL;

  1002.     if ((ret = av_frame_ref(data, f->picture.f)) < 0)

  1003.         return ret;

  1004. 

  1005.     *got_frame = 1;

  1006. 

  1007.     return buf_size;

  1008. }

  1009. 

  1010. static int init_thread_copy(AVCodecContext *avctx)

  1011. {

  1012.     FFV1Context *f = avctx->priv_data;

  1013.     int i, ret;

  1014. 

  1015.     f->picture.f      = NULL;

  1016.     f->last_picture.f = NULL;

  1017.     f->sample_buffer  = NULL;

  1018.     f->max_slice_count = 0;

  1019.     f->slice_count = 0;

  1020. 

  1021.     for (i = 0; i < f->quant_table_count; i++) {

  1022.         av_assert0(f->version > 1);

  1023.         f->initial_states[i] = av_memdup(f->initial_states[i],

  1024.                                          f->context_count[i] * sizeof(*f->initial_states[i]));

  1025.     }

  1026. 

  1027.     f->picture.f      = av_frame_alloc();

  1028.     f->last_picture.f = av_frame_alloc();

  1029. 

  1030.     if ((ret = ffv1_init_slice_contexts(f)) < 0)

  1031.         return ret;

  1032. 

  1033.     return 0;

  1034. }

  1035. 

  1036. static void copy_fields(FFV1Context *fsdst, FFV1Context *fssrc, FFV1Context *fsrc)

  1037. {

  1038.     fsdst->version             = fsrc->version;

  1039.     fsdst->micro_version       = fsrc->micro_version;

  1040.     fsdst->chroma_planes       = fsrc->chroma_planes;

  1041.     fsdst->chroma_h_shift      = fsrc->chroma_h_shift;

  1042.     fsdst->chroma_v_shift      = fsrc->chroma_v_shift;

  1043.     fsdst->transparency        = fsrc->transparency;

  1044.     fsdst->plane_count         = fsrc->plane_count;

  1045.     fsdst->ac                  = fsrc->ac;

  1046.     fsdst->colorspace          = fsrc->colorspace;

  1047. 

  1048.     fsdst->ec                  = fsrc->ec;

  1049.     fsdst->intra               = fsrc->intra;

  1050.     fsdst->slice_damaged       = fssrc->slice_damaged;

  1051.     fsdst->key_frame_ok        = fsrc->key_frame_ok;

  1052. 

  1053.     fsdst->bits_per_raw_sample = fsrc->bits_per_raw_sample;

  1054.     fsdst->packed_at_lsb       = fsrc->packed_at_lsb;

  1055.     fsdst->slice_count         = fsrc->slice_count;

  1056.     if (fsrc->version<3){

  1057.         fsdst->slice_x             = fssrc->slice_x;

  1058.         fsdst->slice_y             = fssrc->slice_y;

  1059.         fsdst->slice_width         = fssrc->slice_width;

  1060.         fsdst->slice_height        = fssrc->slice_height;

  1061.     }

  1062. }

  1063. 

  1064. static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1065. {

  1066.     FFV1Context *fsrc = src->priv_data;

  1067.     FFV1Context *fdst = dst->priv_data;

  1068.     int i, ret;

  1069. 

  1070.     if (dst == src)

  1071.         return 0;

  1072. 

  1073.     {

  1074.         FFV1Context bak = *fdst;

  1075.         memcpy(fdst, fsrc, sizeof(*fdst));

  1076.         memcpy(fdst->initial_states, bak.initial_states, sizeof(fdst->initial_states));

  1077.         memcpy(fdst->slice_context,  bak.slice_context , sizeof(fdst->slice_context));

  1078.         fdst->picture      = bak.picture;

  1079.         fdst->last_picture = bak.last_picture;

  1080.         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

  1081.             FFV1Context *fssrc = fsrc->slice_context[i];

  1082.             FFV1Context *fsdst = fdst->slice_context[i];

  1083.             copy_fields(fsdst, fssrc, fsrc);

  1084.         }

  1085.         av_assert0(!fdst->plane[0].state);

  1086.         av_assert0(!fdst->sample_buffer);

  1087.     }

  1088. 

  1089.     av_assert1(fdst->max_slice_count == fsrc->max_slice_count);

  1090. 

  1091. 

  1092.     ff_thread_release_buffer(dst, &fdst->picture);

  1093.     if (fsrc->picture.f->data[0]) {

  1094.         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

  1095.             return ret;

  1096.     }

  1097. 

  1098.     fdst->fsrc = fsrc;

  1099. 

  1100.     return 0;

  1101. }

  1102. 

  1103. AVCodec ff_ffv1_decoder = {

  1104.     .name           = "ffv1",

  1105.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1106.     .type           = AVMEDIA_TYPE_VIDEO,

  1107.     .id             = AV_CODEC_ID_FFV1,

  1108.     .priv_data_size = sizeof(FFV1Context),

  1109.     .init           = decode_init,

  1110.     .close          = ffv1_close,

  1111.     .decode         = decode_frame,

  1112.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),

  1113.     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

  1114.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1115.                       CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,

  1116. };