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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.     ff_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.             ff_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] = av_mod_uintp2(predict(sample[1] + x, sample[0] + x) + diff, bits);

  176.     }

  177.     s->run_index = run_index;

  178. }

  179. 

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

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

  182. {

  183.     int x, y;

  184.     int16_t *sample[2];

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

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

  187. 

  188.     s->run_index = 0;

  189. 

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

  191. 

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

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

  194. 

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

  196.         sample[1] = temp;

  197. 

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

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

  200. 

  201. // { START_TIMER

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

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

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

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

  206.         } else {

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

  208.             if (s->packed_at_lsb) {

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

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

  211.                 }

  212.             } else {

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

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

  215.                 }

  216.             }

  217.         }

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

  219.     }

  220. }

  221. 

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

  223. {

  224.     int x, y, p;

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

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

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

  228.     int offset = 1 << bits;

  229. 

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

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

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

  233.     }

  234. 

  235.     s->run_index = 0;

  236. 

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

  238. 

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

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

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

  242. 

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

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

  245. 

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

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

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

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

  250.             else

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

  252.         }

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

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

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

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

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

  258. 

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

  260.                 b -= offset;

  261.                 r -= offset;

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

  263.                 b += g;

  264.                 r += g;

  265.             }

  266. 

  267.             if (lbd)

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

  269.             else {

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

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

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

  273.             }

  274.         }

  275.     }

  276. }

  277. 

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

  279. {

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

  281.     uint8_t state[CONTEXT_SIZE];

  282.     unsigned ps, i, context_count;

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

  284. 

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

  286. 

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

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

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

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

  291. 

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

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

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

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

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

  297.         return -1;

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

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

  300.         return -1;

  301. 

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

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

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

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

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

  307.             return -1;

  308.         }

  309.         p->quant_table_index = idx;

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

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

  312. 

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

  314.             av_freep(&p->state);

  315.             av_freep(&p->vlc_state);

  316.         }

  317.         p->context_count = context_count;

  318.     }

  319. 

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

  321.     if (ps == 1) {

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

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

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

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

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

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

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

  329.     }

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

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

  332. 

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

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

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

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

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

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

  339.     }

  340. 

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

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

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

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

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

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

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

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

  349.                 return AVERROR_INVALIDDATA;

  350.             }

  351.         }

  352.     }

  353. 

  354.     return 0;

  355. }

  356. 

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

  358. {

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

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

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

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

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

  364.     int i, si;

  365. 

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

  367.         ;

  368. 

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

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

  371. 

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

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

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

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

  376.         av_assert1(fsdst == fs);

  377. 

  378.         if (!p->key_frame)

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

  380. 

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

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

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

  384. 

  385.             av_free(pdst->state);

  386.             av_free(pdst->vlc_state);

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

  388.             pdst->state = NULL;

  389.             pdst->vlc_state = NULL;

  390. 

  391.             if (fssrc->ac) {

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

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

  394.             } else {

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

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

  397.             }

  398.         }

  399.     }

  400. 

  401.     fs->slice_rct_by_coef = 1;

  402.     fs->slice_rct_ry_coef = 1;

  403. 

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

  405.         if (ff_ffv1_init_slice_state(f, fs) < 0)

  406.             return AVERROR(ENOMEM);

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

  408.             fs->slice_damaged = 1;

  409.             return AVERROR_INVALIDDATA;

  410.         }

  411.     }

  412.     if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)

  413.         return ret;

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

  415.         ff_ffv1_clear_slice_state(f, fs);

  416. 

  417.     width  = fs->slice_width;

  418.     height = fs->slice_height;

  419.     x      = fs->slice_x;

  420.     y      = fs->slice_y;

  421. 

  422.     if (!fs->ac) {

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

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

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

  426.         init_get_bits(&fs->gb,

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

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

  429.     }

  430. 

  431.     av_assert1(width && height);

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

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

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

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

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

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

  438. 

  439.         if (f->chroma_planes) {

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

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

  442.         }

  443.         if (fs->transparency)

  444.             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], (f->version >= 4 && !f->chroma_planes) ? 1 : 2);

  445.     } else {

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

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

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

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

  450.     }

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

  452.         int v;

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

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

  455.         if (v) {

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

  457.             fs->slice_damaged = 1;

  458.         }

  459.     }

  460. 

  461.     emms_c();

  462. 

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

  464. 

  465.     return 0;

  466. }

  467. 

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

  469. {

  470.     int v;

  471.     int i = 0;

  472.     uint8_t state[CONTEXT_SIZE];

  473. 

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

  475. 

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

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

  478. 

  479.         if (len > 128 - i || !len)

  480.             return AVERROR_INVALIDDATA;

  481. 

  482.         while (len--) {

  483.             quant_table[i] = scale * v;

  484.             i++;

  485.         }

  486.     }

  487. 

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

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

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

  491. 

  492.     return 2 * v - 1;

  493. }

  494. 

  495. static int read_quant_tables(RangeCoder *c,

  496.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  497. {

  498.     int i;

  499.     int context_count = 1;

  500. 

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

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

  503.         if (context_count > 32768U) {

  504.             return AVERROR_INVALIDDATA;

  505.         }

  506.     }

  507.     return (context_count + 1) / 2;

  508. }

  509. 

  510. static int read_extra_header(FFV1Context *f)

  511. {

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

  513.     uint8_t state[CONTEXT_SIZE];

  514.     int i, j, k, ret;

  515.     uint8_t state2[32][CONTEXT_SIZE];

  516.     unsigned crc = 0;

  517. 

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

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

  520. 

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

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

  523. 

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

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

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

  527.         return AVERROR_INVALIDDATA;

  528.     }

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

  530.         c->bytestream_end -= 4;

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

  532.         if (f->micro_version < 0)

  533.             return AVERROR_INVALIDDATA;

  534.     }

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

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

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

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

  539.     }

  540. 

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

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

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

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

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

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

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

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

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

  550. 

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

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

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

  554.         return AVERROR_INVALIDDATA;

  555.     }

  556. 

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

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

  559.        ) {

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

  561.         return AVERROR_INVALIDDATA;

  562.     }

  563. 

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

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

  566.         return AVERROR_INVALIDDATA;

  567. 

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

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

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

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

  572.             return AVERROR_INVALIDDATA;

  573.         }

  574.     }

  575.     if ((ret = ff_ffv1_allocate_initial_states(f)) < 0)

  576.         return ret;

  577. 

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

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

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

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

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

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

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

  585.                 }

  586.         }

  587. 

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

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

  590.         if (f->micro_version > 2)

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

  592.     }

  593. 

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

  595.         unsigned v;

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

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

  598.         if (v || f->avctx->extradata_size < 4) {

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

  600.             return AVERROR_INVALIDDATA;

  601.         }

  602.         crc = AV_RB32(f->avctx->extradata + f->avctx->extradata_size - 4);

  603.     }

  604. 

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

  606.         av_log(f->avctx, AV_LOG_DEBUG,

  607.                "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 CRC:0x%08X\n",

  608.                f->version, f->micro_version,

  609.                f->ac,

  610.                f->colorspace,

  611.                f->avctx->bits_per_raw_sample,

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

  613.                f->transparency,

  614.                f->num_h_slices, f->num_v_slices,

  615.                f->quant_table_count,

  616.                f->ec,

  617.                f->intra,

  618.                crc

  619.               );

  620.     return 0;

  621. }

  622. 

  623. static int read_header(FFV1Context *f)

  624. {

  625.     uint8_t state[CONTEXT_SIZE];

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

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

  628. 

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

  630. 

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

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

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

  634.         if (v >= 2) {

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

  636.             return AVERROR_INVALIDDATA;

  637.         }

  638.         f->version = v;

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

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

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

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

  643.         }

  644. 

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

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

  647.         chroma_planes       = get_rac(c, state);

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

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

  650.         transparency        = get_rac(c, state);

  651.         if (colorspace == 0 && f->avctx->skip_alpha)

  652.             transparency = 0;

  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->transparency && !f->chroma_planes) {

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

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

  686.             else

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

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

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

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

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

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

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

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

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

  696.             }

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

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

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

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

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

  702.             }

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

  704.             f->packed_at_lsb = 1;

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

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

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

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

  709.             }

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

  711.             f->packed_at_lsb = 1;

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

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

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

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

  716.             }

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

  718.             f->packed_at_lsb = 1;

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

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

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

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

  723.             }

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

  725.             f->packed_at_lsb = 1;

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

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

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

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

  730.             }

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

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

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

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

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

  736.             }

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

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

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

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

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

  742.             }

  743.         }

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

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

  746.             av_log(f->avctx, AV_LOG_ERROR,

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

  748.             return AVERROR(ENOSYS);

  749.         }

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

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

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

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

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

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

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

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

  758.         else

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

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

  761.     } else {

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

  763.         return AVERROR(ENOSYS);

  764.     }

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

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

  767.         return AVERROR(ENOSYS);

  768.     }

  769. 

  770.     ff_dlog(f->avctx, "%d %d %d\n",

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

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

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

  774.         if (context_count < 0) {

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

  776.             return AVERROR_INVALIDDATA;

  777.         }

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

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

  780.     } else {

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

  782.         for (f->slice_count = 0;

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

  784.              f->slice_count++) {

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

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

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

  788.                 break;

  789.             p -= size + trailer;

  790.         }

  791.     }

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

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

  794.         return AVERROR_INVALIDDATA;

  795.     }

  796. 

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

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

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

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

  801. 

  802.         fs->slice_damaged = 0;

  803. 

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

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

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

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

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

  809. 

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

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

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

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

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

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

  816.                 return AVERROR_INVALIDDATA;

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

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

  819.                 return AVERROR_INVALIDDATA;

  820.         }

  821. 

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

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

  824. 

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

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

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

  828.                     av_log(f->avctx, AV_LOG_ERROR,

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

  830.                     return AVERROR_INVALIDDATA;

  831.                 }

  832.                 p->quant_table_index = idx;

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

  834.                        sizeof(p->quant_table));

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

  836.             } else {

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

  838.             }

  839. 

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

  841.                 av_assert0(context_count >= 0);

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

  843.                     av_freep(&p->state);

  844.                     av_freep(&p->vlc_state);

  845.                 }

  846.                 p->context_count = context_count;

  847.             }

  848.         }

  849.     }

  850.     return 0;

  851. }

  852. 

  853. static av_cold int decode_init(AVCodecContext *avctx)

  854. {

  855.     FFV1Context *f = avctx->priv_data;

  856.     int ret;

  857. 

  858.     if ((ret = ff_ffv1_common_init(avctx)) < 0)

  859.         return ret;

  860. 

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

  862.         return ret;

  863. 

  864.     if ((ret = ff_ffv1_init_slice_contexts(f)) < 0)

  865.         return ret;

  866. 

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

  868. 

  869.     return 0;

  870. }

  871. 

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

  873. {

  874.     uint8_t *buf        = avpkt->data;

  875.     int buf_size        = avpkt->size;

  876.     FFV1Context *f      = avctx->priv_data;

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

  878.     int i, ret;

  879.     uint8_t keystate = 128;

  880.     uint8_t *buf_p;

  881.     AVFrame *p;

  882. 

  883.     if (f->last_picture.f)

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

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

  886. 

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

  888. 

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

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

  891.         p->interlaced_frame = 1;

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

  893.             p->top_field_first = 1;

  894.     }

  895. 

  896.     f->avctx = avctx;

  897.     ff_init_range_decoder(c, buf, buf_size);

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

  899. 

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

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

  902.         p->key_frame    = 1;

  903.         f->key_frame_ok = 0;

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

  905.             return ret;

  906.         f->key_frame_ok = 1;

  907.     } else {

  908.         if (!f->key_frame_ok) {

  909.             av_log(avctx, AV_LOG_ERROR,

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

  911.             return AVERROR_INVALIDDATA;

  912.         }

  913.         p->key_frame = 0;

  914.     }

  915. 

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

  917.         return ret;

  918. 

  919.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  922. 

  923.     ff_thread_finish_setup(avctx);

  924. 

  925.     buf_p = buf + buf_size;

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

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

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

  929.         int v;

  930. 

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

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

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

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

  935.             return AVERROR_INVALIDDATA;

  936.         }

  937.         buf_p -= v;

  938. 

  939.         if (f->ec) {

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

  941.             if (crc) {

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

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

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

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

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

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

  948.                 } else {

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

  950.                 }

  951.                 fs->slice_damaged = 1;

  952.             }

  953.             if (avctx->debug & FF_DEBUG_PICT_INFO) {

  954.                 av_log(avctx, AV_LOG_DEBUG, "slice %d, CRC: 0x%08X\n", i, AV_RB32(buf_p + v - 4));

  955.             }

  956.         }

  957. 

  958.         if (i) {

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

  960.         } else

  961.             fs->c.bytestream_end = buf_p + v;

  962. 

  963.         fs->avctx = avctx;

  964.         fs->cur = p;

  965.     }

  966. 

  967.     avctx->execute(avctx,

  968.                    decode_slice,

  969.                    &f->slice_context[0],

  970.                    NULL,

  971.                    f->slice_count,

  972.                    sizeof(void*));

  973. 

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

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

  976.         int j;

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

  978.             const uint8_t *src[4];

  979.             uint8_t *dst[4];

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

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

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

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

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

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

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

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

  988.             }

  989.             av_image_copy(dst, p->linesize, src,

  990.                           f->last_picture.f->linesize,

  991.                           avctx->pix_fmt,

  992.                           fs->slice_width,

  993.                           fs->slice_height);

  994.         }

  995.     }

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

  997. 

  998.     f->picture_number++;

  999. 

  1000.     if (f->last_picture.f)

  1001.         ff_thread_release_buffer(avctx, &f->last_picture);

  1002.     f->cur = NULL;

  1003.     if ((ret = av_frame_ref(data, f->picture.f)) < 0)

  1004.         return ret;

  1005. 

  1006.     *got_frame = 1;

  1007. 

  1008.     return buf_size;

  1009. }

  1010. 

  1011. static int init_thread_copy(AVCodecContext *avctx)

  1012. {

  1013.     FFV1Context *f = avctx->priv_data;

  1014.     int i, ret;

  1015. 

  1016.     f->picture.f      = NULL;

  1017.     f->last_picture.f = NULL;

  1018.     f->sample_buffer  = NULL;

  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 = ff_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.         ThreadFrame picture = fdst->picture, last_picture = fdst->last_picture;

  1075.         uint8_t (*initial_states[MAX_QUANT_TABLES])[32];

  1076.         struct FFV1Context *slice_context[MAX_SLICES];

  1077.         memcpy(initial_states, fdst->initial_states, sizeof(fdst->initial_states));

  1078.         memcpy(slice_context,  fdst->slice_context , sizeof(fdst->slice_context));

  1079. 

  1080.         memcpy(fdst, fsrc, sizeof(*fdst));

  1081.         memcpy(fdst->initial_states, initial_states, sizeof(fdst->initial_states));

  1082.         memcpy(fdst->slice_context,  slice_context , sizeof(fdst->slice_context));

  1083.         fdst->picture      = picture;

  1084.         fdst->last_picture = last_picture;

  1085.         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

  1086.             FFV1Context *fssrc = fsrc->slice_context[i];

  1087.             FFV1Context *fsdst = fdst->slice_context[i];

  1088.             copy_fields(fsdst, fssrc, fsrc);

  1089.         }

  1090.         av_assert0(!fdst->plane[0].state);

  1091.         av_assert0(!fdst->sample_buffer);

  1092.     }

  1093. 

  1094.     av_assert1(fdst->slice_count == fsrc->slice_count);

  1095. 

  1096. 

  1097.     ff_thread_release_buffer(dst, &fdst->picture);

  1098.     if (fsrc->picture.f->data[0]) {

  1099.         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

  1100.             return ret;

  1101.     }

  1102. 

  1103.     fdst->fsrc = fsrc;

  1104. 

  1105.     return 0;

  1106. }

  1107. 

  1108. AVCodec ff_ffv1_decoder = {

  1109.     .name           = "ffv1",

  1110.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1111.     .type           = AVMEDIA_TYPE_VIDEO,

  1112.     .id             = AV_CODEC_ID_FFV1,

  1113.     .priv_data_size = sizeof(FFV1Context),

  1114.     .init           = decode_init,

  1115.     .close          = ff_ffv1_close,

  1116.     .decode         = decode_frame,

  1117.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),

  1118.     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

  1119.     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1120.                       AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,

  1121. };