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

  179.     }

  180.     s->run_index = run_index;

  181. }

  182. 

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

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

  185. {

  186.     int x, y;

  187.     int16_t *sample[2];

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

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

  190. 

  191.     s->run_index = 0;

  192. 

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

  194. 

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

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

  197. 

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

  199.         sample[1] = temp;

  200. 

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

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

  203. 

  204. // { START_TIMER

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

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

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

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

  209.         } else {

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

  211.             if (s->packed_at_lsb) {

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

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

  214.                 }

  215.             } else {

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

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

  218.                 }

  219.             }

  220.         }

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

  222.     }

  223. }

  224. 

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

  226. {

  227.     int x, y, p;

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

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

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

  231.     int offset = 1 << bits;

  232. 

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

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

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

  236.     }

  237. 

  238.     s->run_index = 0;

  239. 

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

  241. 

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

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

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

  245. 

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

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

  248. 

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

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

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

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

  253.             else

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

  255.         }

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

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

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

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

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

  261. 

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

  263.                 b -= offset;

  264.                 r -= offset;

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

  266.                 b += g;

  267.                 r += g;

  268.             }

  269. 

  270.             if (lbd)

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

  272.             else {

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

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

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

  276.             }

  277.         }

  278.     }

  279. }

  280. 

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

  282. {

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

  284.     uint8_t state[CONTEXT_SIZE];

  285.     unsigned ps, i, context_count;

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

  287. 

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

  289. 

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

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

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

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

  294. 

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

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

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

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

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

  300.         return -1;

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

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

  303.         return -1;

  304. 

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

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

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

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

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

  310.             return -1;

  311.         }

  312.         p->quant_table_index = idx;

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

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

  315. 

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

  317.             av_freep(&p->state);

  318.             av_freep(&p->vlc_state);

  319.         }

  320.         p->context_count = context_count;

  321.     }

  322. 

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

  324.     if (ps == 1) {

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

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

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

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

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

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

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

  332.     }

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

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

  335. 

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

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

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

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

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

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

  342.     }

  343. 

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

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

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

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

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

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

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

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

  352.                 return AVERROR_INVALIDDATA;

  353.             }

  354.         }

  355.     }

  356. 

  357.     return 0;

  358. }

  359. 

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

  361. {

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

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

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

  365.     const int ps      = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step;

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

  367.     int i, si;

  368. 

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

  370.         ;

  371. 

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

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

  374. 

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

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

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

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

  379.         av_assert1(fsdst == fs);

  380. 

  381.         if (!p->key_frame)

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

  383. 

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

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

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

  387. 

  388.             av_free(pdst->state);

  389.             av_free(pdst->vlc_state);

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

  391.             pdst->state = NULL;

  392.             pdst->vlc_state = NULL;

  393. 

  394.             if (fssrc->ac) {

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

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

  397.             } else {

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

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

  400.             }

  401.         }

  402.     }

  403. 

  404.     fs->slice_rct_by_coef = 1;

  405.     fs->slice_rct_ry_coef = 1;

  406. 

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

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

  409.             return AVERROR(ENOMEM);

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

  411.             fs->slice_damaged = 1;

  412.             return AVERROR_INVALIDDATA;

  413.         }

  414.     }

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

  416.         return ret;

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

  418.         ff_ffv1_clear_slice_state(f, fs);

  419. 

  420.     width  = fs->slice_width;

  421.     height = fs->slice_height;

  422.     x      = fs->slice_x;

  423.     y      = fs->slice_y;

  424. 

  425.     if (!fs->ac) {

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

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

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

  429.         init_get_bits(&fs->gb,

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

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

  432.     }

  433. 

  434.     av_assert1(width && height);

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

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

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

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

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

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

  441. 

  442.         if (f->chroma_planes) {

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

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

  445.         }

  446.         if (fs->transparency)

  447.             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);

  448.     } else {

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

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

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

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

  453.     }

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

  455.         int v;

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

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

  458.         if (v) {

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

  460.             fs->slice_damaged = 1;

  461.         }

  462.     }

  463. 

  464.     emms_c();

  465. 

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

  467. 

  468.     return 0;

  469. }

  470. 

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

  472. {

  473.     int v;

  474.     int i = 0;

  475.     uint8_t state[CONTEXT_SIZE];

  476. 

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

  478. 

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

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

  481. 

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

  483.             return AVERROR_INVALIDDATA;

  484. 

  485.         while (len--) {

  486.             quant_table[i] = scale * v;

  487.             i++;

  488.         }

  489.     }

  490. 

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

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

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

  494. 

  495.     return 2 * v - 1;

  496. }

  497. 

  498. static int read_quant_tables(RangeCoder *c,

  499.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  500. {

  501.     int i;

  502.     int context_count = 1;

  503. 

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

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

  506.         if (context_count > 32768U) {

  507.             return AVERROR_INVALIDDATA;

  508.         }

  509.     }

  510.     return (context_count + 1) / 2;

  511. }

  512. 

  513. static int read_extra_header(FFV1Context *f)

  514. {

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

  516.     uint8_t state[CONTEXT_SIZE];

  517.     int i, j, k, ret;

  518.     uint8_t state2[32][CONTEXT_SIZE];

  519.     unsigned crc = 0;

  520. 

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

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

  523. 

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

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

  526. 

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

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

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

  530.         return AVERROR_INVALIDDATA;

  531.     }

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

  533.         c->bytestream_end -= 4;

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

  535.         if (f->micro_version < 0)

  536.             return AVERROR_INVALIDDATA;

  537.     }

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

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

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

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

  542.     }

  543. 

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

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

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

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

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

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

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

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

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

  553. 

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

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

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

  557.         return AVERROR_INVALIDDATA;

  558.     }

  559. 

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

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

  562.        ) {

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

  564.         return AVERROR_INVALIDDATA;

  565.     }

  566. 

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

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

  569.         return AVERROR_INVALIDDATA;

  570. 

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

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

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

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

  575.             return AVERROR_INVALIDDATA;

  576.         }

  577.     }

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

  579.         return ret;

  580. 

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

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

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

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

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

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

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

  588.                 }

  589.         }

  590. 

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

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

  593.         if (f->micro_version > 2)

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

  595.     }

  596. 

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

  598.         unsigned v;

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

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

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

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

  603.             return AVERROR_INVALIDDATA;

  604.         }

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

  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 CRC:0x%08X\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.                crc

  622.               );

  623.     return 0;

  624. }

  625. 

  626. static int read_header(FFV1Context *f)

  627. {

  628.     uint8_t state[CONTEXT_SIZE];

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

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

  631. 

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

  633. 

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

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

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

  637.         if (v >= 2) {

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

  639.             return AVERROR_INVALIDDATA;

  640.         }

  641.         f->version = v;

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

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

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

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

  646.         }

  647. 

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

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

  650.         chroma_planes       = get_rac(c, state);

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

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

  653.         transparency        = get_rac(c, state);

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

  655.             transparency = 0;

  656. 

  657.         if (f->plane_count) {

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

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

  660.                 chroma_planes       != f->chroma_planes              ||

  661.                 chroma_h_shift      != f->chroma_h_shift             ||

  662.                 chroma_v_shift      != f->chroma_v_shift             ||

  663.                 transparency        != f->transparency) {

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

  665.                 return AVERROR_INVALIDDATA;

  666.             }

  667.         }

  668. 

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

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

  671.                    chroma_h_shift, chroma_v_shift);

  672.             return AVERROR_INVALIDDATA;

  673.         }

  674. 

  675.         f->colorspace                 = colorspace;

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

  677.         f->chroma_planes              = chroma_planes;

  678.         f->chroma_h_shift             = chroma_h_shift;

  679.         f->chroma_v_shift             = chroma_v_shift;

  680.         f->transparency               = transparency;

  681. 

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

  683.     }

  684. 

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

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

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

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

  689.             else

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

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

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

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

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

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

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

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

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

  699.             }

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

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

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

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

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

  705.             }

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

  707.             f->packed_at_lsb = 1;

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

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

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

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

  712.             }

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

  714.             f->packed_at_lsb = 1;

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

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

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

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

  719.             }

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

  721.             f->packed_at_lsb = 1;

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

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

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

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

  726.             }

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

  728.             f->packed_at_lsb = 1;

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

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

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

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

  733.             }

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

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

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

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

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

  739.             }

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

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

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

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

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

  745.             }

  746.         }

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

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

  749.             av_log(f->avctx, AV_LOG_ERROR,

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

  751.             return AVERROR(ENOSYS);

  752.         }

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

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

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

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

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

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

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

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

  761.         else

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

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

  764.     } else {

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

  766.         return AVERROR(ENOSYS);

  767.     }

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

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

  770.         return AVERROR(ENOSYS);

  771.     }

  772. 

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

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

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

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

  777.         if (context_count < 0) {

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

  779.             return AVERROR_INVALIDDATA;

  780.         }

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

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

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

  784.     } else {

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

  786.         for (f->slice_count = 0;

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

  788.              f->slice_count++) {

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

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

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

  792.                 break;

  793.             p -= size + trailer;

  794.         }

  795.     }

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

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

  798.         return AVERROR_INVALIDDATA;

  799.     }

  800. 

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

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

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

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

  805. 

  806.         fs->slice_damaged = 0;

  807. 

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

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

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

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

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

  813. 

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

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

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

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

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

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

  820.                 return AVERROR_INVALIDDATA;

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

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

  823.                 return AVERROR_INVALIDDATA;

  824.         }

  825. 

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

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

  828. 

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

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

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

  832.                     av_log(f->avctx, AV_LOG_ERROR,

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

  834.                     return AVERROR_INVALIDDATA;

  835.                 }

  836.                 p->quant_table_index = idx;

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

  838.                        sizeof(p->quant_table));

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

  840.             } else {

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

  842.             }

  843. 

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

  845.                 av_assert0(context_count >= 0);

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

  847.                     av_freep(&p->state);

  848.                     av_freep(&p->vlc_state);

  849.                 }

  850.                 p->context_count = context_count;

  851.             }

  852.         }

  853.     }

  854.     return 0;

  855. }

  856. 

  857. static av_cold int decode_init(AVCodecContext *avctx)

  858. {

  859.     FFV1Context *f = avctx->priv_data;

  860.     int ret;

  861. 

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

  863.         return ret;

  864. 

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

  866.         return ret;

  867. 

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

  869.         return ret;

  870. 

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

  872. 

  873.     return 0;

  874. }

  875. 

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

  877. {

  878.     uint8_t *buf        = avpkt->data;

  879.     int buf_size        = avpkt->size;

  880.     FFV1Context *f      = avctx->priv_data;

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

  882.     int i, ret;

  883.     uint8_t keystate = 128;

  884.     uint8_t *buf_p;

  885.     AVFrame *p;

  886. 

  887.     if (f->last_picture.f)

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

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

  890. 

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

  892. 

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

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

  895.         p->interlaced_frame = 1;

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

  897.             p->top_field_first = 1;

  898.     }

  899. 

  900.     f->avctx = avctx;

  901.     ff_init_range_decoder(c, buf, buf_size);

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

  903. 

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

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

  906.         p->key_frame    = 1;

  907.         f->key_frame_ok = 0;

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

  909.             return ret;

  910.         f->key_frame_ok = 1;

  911.     } else {

  912.         if (!f->key_frame_ok) {

  913.             av_log(avctx, AV_LOG_ERROR,

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

  915.             return AVERROR_INVALIDDATA;

  916.         }

  917.         p->key_frame = 0;

  918.     }

  919. 

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

  921.         return ret;

  922. 

  923.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  926. 

  927.     ff_thread_finish_setup(avctx);

  928. 

  929.     buf_p = buf + buf_size;

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

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

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

  933.         int v;

  934. 

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

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

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

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

  939.             return AVERROR_INVALIDDATA;

  940.         }

  941.         buf_p -= v;

  942. 

  943.         if (f->ec) {

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

  945.             if (crc) {

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

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

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

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

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

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

  952.                 } else {

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

  954.                 }

  955.                 fs->slice_damaged = 1;

  956.             }

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

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

  959.             }

  960.         }

  961. 

  962.         if (i) {

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

  964.         } else

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

  966. 

  967.         fs->avctx = avctx;

  968.         fs->cur = p;

  969.     }

  970. 

  971.     avctx->execute(avctx,

  972.                    decode_slice,

  973.                    &f->slice_context[0],

  974.                    NULL,

  975.                    f->slice_count,

  976.                    sizeof(void*));

  977. 

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

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

  980.         int j;

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

  982.             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);

  983.             const uint8_t *src[4];

  984.             uint8_t *dst[4];

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

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

  987.                 int pixshift = desc->comp[j].depth > 8;

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

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

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

  991.                          (fs->slice_y >> sv) + ((fs->slice_x >> sh) << pixshift);

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

  993.                          (fs->slice_y >> sv) + ((fs->slice_x >> sh) << pixshift);

  994.             }

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

  996.                           f->last_picture.f->linesize,

  997.                           avctx->pix_fmt,

  998.                           fs->slice_width,

  999.                           fs->slice_height);

  1000.         }

  1001.     }

  1002.     ff_thread_report_progress(&f->picture, INT_MAX, 0);

  1003. 

  1004.     f->picture_number++;

  1005. 

  1006.     if (f->last_picture.f)

  1007.         ff_thread_release_buffer(avctx, &f->last_picture);

  1008.     f->cur = NULL;

  1009.     if ((ret = av_frame_ref(data, f->picture.f)) < 0)

  1010.         return ret;

  1011. 

  1012.     *got_frame = 1;

  1013. 

  1014.     return buf_size;

  1015. }

  1016. 

  1017. static int init_thread_copy(AVCodecContext *avctx)

  1018. {

  1019.     FFV1Context *f = avctx->priv_data;

  1020.     int i, ret;

  1021. 

  1022.     f->picture.f      = NULL;

  1023.     f->last_picture.f = NULL;

  1024.     f->sample_buffer  = NULL;

  1025.     f->max_slice_count = 0;

  1026.     f->slice_count = 0;

  1027. 

  1028.     for (i = 0; i < f->quant_table_count; i++) {

  1029.         av_assert0(f->version > 1);

  1030.         f->initial_states[i] = av_memdup(f->initial_states[i],

  1031.                                          f->context_count[i] * sizeof(*f->initial_states[i]));

  1032.     }

  1033. 

  1034.     f->picture.f      = av_frame_alloc();

  1035.     f->last_picture.f = av_frame_alloc();

  1036. 

  1037.     if ((ret = ff_ffv1_init_slice_contexts(f)) < 0)

  1038.         return ret;

  1039. 

  1040.     return 0;

  1041. }

  1042. 

  1043. static void copy_fields(FFV1Context *fsdst, FFV1Context *fssrc, FFV1Context *fsrc)

  1044. {

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

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

  1047.     fsdst->chroma_planes       = fsrc->chroma_planes;

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

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

  1050.     fsdst->transparency        = fsrc->transparency;

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

  1052.     fsdst->ac                  = fsrc->ac;

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

  1054. 

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

  1056.     fsdst->intra               = fsrc->intra;

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

  1058.     fsdst->key_frame_ok        = fsrc->key_frame_ok;

  1059. 

  1060.     fsdst->bits_per_raw_sample = fsrc->bits_per_raw_sample;

  1061.     fsdst->packed_at_lsb       = fsrc->packed_at_lsb;

  1062.     fsdst->slice_count         = fsrc->slice_count;

  1063.     if (fsrc->version<3){

  1064.         fsdst->slice_x             = fssrc->slice_x;

  1065.         fsdst->slice_y             = fssrc->slice_y;

  1066.         fsdst->slice_width         = fssrc->slice_width;

  1067.         fsdst->slice_height        = fssrc->slice_height;

  1068.     }

  1069. }

  1070. 

  1071. static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1072. {

  1073.     FFV1Context *fsrc = src->priv_data;

  1074.     FFV1Context *fdst = dst->priv_data;

  1075.     int i, ret;

  1076. 

  1077.     if (dst == src)

  1078.         return 0;

  1079. 

  1080.     {

  1081.         ThreadFrame picture = fdst->picture, last_picture = fdst->last_picture;

  1082.         uint8_t (*initial_states[MAX_QUANT_TABLES])[32];

  1083.         struct FFV1Context *slice_context[MAX_SLICES];

  1084.         memcpy(initial_states, fdst->initial_states, sizeof(fdst->initial_states));

  1085.         memcpy(slice_context,  fdst->slice_context , sizeof(fdst->slice_context));

  1086. 

  1087.         memcpy(fdst, fsrc, sizeof(*fdst));

  1088.         memcpy(fdst->initial_states, initial_states, sizeof(fdst->initial_states));

  1089.         memcpy(fdst->slice_context,  slice_context , sizeof(fdst->slice_context));

  1090.         fdst->picture      = picture;

  1091.         fdst->last_picture = last_picture;

  1092.         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

  1093.             FFV1Context *fssrc = fsrc->slice_context[i];

  1094.             FFV1Context *fsdst = fdst->slice_context[i];

  1095.             copy_fields(fsdst, fssrc, fsrc);

  1096.         }

  1097.         av_assert0(!fdst->plane[0].state);

  1098.         av_assert0(!fdst->sample_buffer);

  1099.     }

  1100. 

  1101.     av_assert1(fdst->max_slice_count == fsrc->max_slice_count);

  1102. 

  1103. 

  1104.     ff_thread_release_buffer(dst, &fdst->picture);

  1105.     if (fsrc->picture.f->data[0]) {

  1106.         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

  1107.             return ret;

  1108.     }

  1109. 

  1110.     fdst->fsrc = fsrc;

  1111. 

  1112.     return 0;

  1113. }

  1114. 

  1115. AVCodec ff_ffv1_decoder = {

  1116.     .name           = "ffv1",

  1117.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1118.     .type           = AVMEDIA_TYPE_VIDEO,

  1119.     .id             = AV_CODEC_ID_FFV1,

  1120.     .priv_data_size = sizeof(FFV1Context),

  1121.     .init           = decode_init,

  1122.     .close          = ff_ffv1_close,

  1123.     .decode         = decode_frame,

  1124.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),

  1125.     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

  1126.     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1127.                       AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,

  1128. };