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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;

  49.         unsigned a;

  50.         e = 0;

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

  52.             e++;

  53.             if (e > 31)

  54.                 return AVERROR_INVALIDDATA;

  55.         }

  56. 

  57.         a = 1;

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

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

  60. 

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

  62.         return (a ^ e) - e;

  63.     }

  64. }

  65. 

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

  67. {

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

  69. }

  70. 

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

  72.                                  int bits)

  73. {

  74.     int k, i, v, ret;

  75. 

  76.     i = state->count;

  77.     k = 0;

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

  79.         k++;

  80.         i += i;

  81.     }

  82. 

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

  84.     ff_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",

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

  86. 

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

  88. 

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

  90. 

  91.     update_vlc_state(state, v);

  92. 

  93.     return ret;

  94. }

  95. 

  96. static int is_input_end(FFV1Context *s)

  97. {

  98.     if (s->ac != AC_GOLOMB_RICE) {

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

  100.         if (c->overread > MAX_OVERREAD)

  101.             return AVERROR_INVALIDDATA;

  102.     } else {

  103.         if (get_bits_left(&s->gb) < 1)

  104.             return AVERROR_INVALIDDATA;

  105.     }

  106.     return 0;

  107. }

  108. 

  109. #define TYPE int16_t

  110. #define RENAME(name) name

  111. #include "ffv1dec_template.c"

  112. #undef TYPE

  113. #undef RENAME

  114. 

  115. #define TYPE int32_t

  116. #define RENAME(name) name ## 32

  117. #include "ffv1dec_template.c"

  118. 

  119. static int decode_plane(FFV1Context *s, uint8_t *src,

  120.                          int w, int h, int stride, int plane_index,

  121.                          int pixel_stride)

  122. {

  123.     int x, y;

  124.     int16_t *sample[2];

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

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

  127. 

  128.     s->run_index = 0;

  129. 

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

  131. 

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

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

  134. 

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

  136.         sample[1] = temp;

  137. 

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

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

  140. 

  141. // { START_TIMER

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

  143.             int ret = decode_line(s, w, sample, plane_index, 8);

  144.             if (ret < 0)

  145.                 return ret;

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

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

  148.         } else {

  149.             int ret = decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  150.             if (ret < 0)

  151.                 return ret;

  152.             if (s->packed_at_lsb) {

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

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

  155.                 }

  156.             } else {

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

  158.                     ((uint16_t*)(src + stride*y))[x*pixel_stride] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample) | ((uint16_t **)sample)[1][x] >> (2 * s->avctx->bits_per_raw_sample - 16);

  159.                 }

  160.             }

  161.         }

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

  163.     }

  164.     return 0;

  165. }

  166. 

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

  168. {

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

  170.     uint8_t state[CONTEXT_SIZE];

  171.     unsigned ps, i, context_count;

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

  173. 

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

  175. 

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

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

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

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

  180. 

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

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

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

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

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

  186.         return -1;

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

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

  189.         return -1;

  190. 

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

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

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

  194.         if (idx >= (unsigned)f->quant_table_count) {

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

  196.             return -1;

  197.         }

  198.         p->quant_table_index = idx;

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

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

  201. 

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

  203.             av_freep(&p->state);

  204.             av_freep(&p->vlc_state);

  205.         }

  206.         p->context_count = context_count;

  207.     }

  208. 

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

  210.     if (ps == 1) {

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

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

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

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

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

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

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

  218.     }

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

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

  221. 

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

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

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

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

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

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

  228.     }

  229. 

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

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

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

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

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

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

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

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

  238.                 return AVERROR_INVALIDDATA;

  239.             }

  240.         }

  241.     }

  242. 

  243.     return 0;

  244. }

  245. 

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

  247. {

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

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

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

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

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

  253.     int i, si;

  254. 

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

  256.         ;

  257. 

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

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

  260. 

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

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

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

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

  265.         av_assert1(fsdst == fs);

  266. 

  267.         if (!p->key_frame)

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

  269. 

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

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

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

  273. 

  274.             av_free(pdst->state);

  275.             av_free(pdst->vlc_state);

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

  277.             pdst->state = NULL;

  278.             pdst->vlc_state = NULL;

  279. 

  280.             if (fssrc->ac) {

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

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

  283.             } else {

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

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

  286.             }

  287.         }

  288.     }

  289. 

  290.     fs->slice_rct_by_coef = 1;

  291.     fs->slice_rct_ry_coef = 1;

  292. 

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

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

  295.             return AVERROR(ENOMEM);

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

  297.             fs->slice_x = fs->slice_y = fs->slice_height = fs->slice_width = 0;

  298.             fs->slice_damaged = 1;

  299.             return AVERROR_INVALIDDATA;

  300.         }

  301.     }

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

  303.         return ret;

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

  305.         ff_ffv1_clear_slice_state(f, fs);

  306. 

  307.     width  = fs->slice_width;

  308.     height = fs->slice_height;

  309.     x      = fs->slice_x;

  310.     y      = fs->slice_y;

  311. 

  312.     if (fs->ac == AC_GOLOMB_RICE) {

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

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

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

  316.         init_get_bits(&fs->gb,

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

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

  319.     }

  320. 

  321.     av_assert1(width && height);

  322.     if (f->colorspace == 0 && (f->chroma_planes || !fs->transparency)) {

  323.         const int chroma_width  = AV_CEIL_RSHIFT(width,  f->chroma_h_shift);

  324.         const int chroma_height = AV_CEIL_RSHIFT(height, f->chroma_v_shift);

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

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

  327.         decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0, 1);

  328. 

  329.         if (f->chroma_planes) {

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

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

  332.         }

  333.         if (fs->transparency)

  334.             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, 1);

  335.     } else if (f->colorspace == 0) {

  336.          decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0]    , width, height, p->linesize[0], 0, 2);

  337.          decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0] + 1, width, height, p->linesize[0], 1, 2);

  338.     } else if (f->use32bit) {

  339.         uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0],

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

  341.                                p->data[2] + ps * x + y * p->linesize[2],

  342.                                p->data[3] + ps * x + y * p->linesize[3] };

  343.         decode_rgb_frame32(fs, planes, width, height, p->linesize);

  344.     } else {

  345.         uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0],

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

  347.                                p->data[2] + ps * x + y * p->linesize[2],

  348.                                p->data[3] + ps * x + y * p->linesize[3] };

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

  350.     }

  351.     if (fs->ac != AC_GOLOMB_RICE && f->version > 2) {

  352.         int v;

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

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

  355.         if (v) {

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

  357.             fs->slice_damaged = 1;

  358.         }

  359.     }

  360. 

  361.     emms_c();

  362. 

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

  364. 

  365.     return 0;

  366. }

  367. 

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

  369. {

  370.     int v;

  371.     int i = 0;

  372.     uint8_t state[CONTEXT_SIZE];

  373. 

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

  375. 

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

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

  378. 

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

  380.             return AVERROR_INVALIDDATA;

  381. 

  382.         while (len--) {

  383.             quant_table[i] = scale * v;

  384.             i++;

  385.         }

  386.     }

  387. 

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

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

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

  391. 

  392.     return 2 * v - 1;

  393. }

  394. 

  395. static int read_quant_tables(RangeCoder *c,

  396.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  397. {

  398.     int i;

  399.     int context_count = 1;

  400. 

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

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

  403.         if (ret < 0)

  404.             return ret;

  405.         context_count *= ret;

  406.         if (context_count > 32768U) {

  407.             return AVERROR_INVALIDDATA;

  408.         }

  409.     }

  410.     return (context_count + 1) / 2;

  411. }

  412. 

  413. static int read_extra_header(FFV1Context *f)

  414. {

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

  416.     uint8_t state[CONTEXT_SIZE];

  417.     int i, j, k, ret;

  418.     uint8_t state2[32][CONTEXT_SIZE];

  419.     unsigned crc = 0;

  420. 

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

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

  423. 

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

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

  426. 

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

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

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

  430.         return AVERROR_INVALIDDATA;

  431.     }

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

  433.         c->bytestream_end -= 4;

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

  435.         if (f->micro_version < 0)

  436.             return AVERROR_INVALIDDATA;

  437.     }

  438.     f->ac = get_symbol(c, state, 0);

  439. 

  440.     if (f->ac == AC_RANGE_CUSTOM_TAB) {

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

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

  443.     }

  444. 

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

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

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

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

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

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

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

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

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

  454. 

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

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

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

  458.         return AVERROR_INVALIDDATA;

  459.     }

  460. 

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

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

  463.        ) {

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

  465.         return AVERROR_INVALIDDATA;

  466.     }

  467. 

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

  469.     if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES || !f->quant_table_count) {

  470.         av_log(f->avctx, AV_LOG_ERROR, "quant table count %d is invalid\n", f->quant_table_count);

  471.         f->quant_table_count = 0;

  472.         return AVERROR_INVALIDDATA;

  473.     }

  474. 

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

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

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

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

  479.             return AVERROR_INVALIDDATA;

  480.         }

  481.     }

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

  483.         return ret;

  484. 

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

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

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

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

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

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

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

  492.                 }

  493.         }

  494. 

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

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

  497.         if (f->micro_version > 2)

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

  499.     }

  500. 

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

  502.         unsigned v;

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

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

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

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

  507.             return AVERROR_INVALIDDATA;

  508.         }

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

  510.     }

  511. 

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

  513.         av_log(f->avctx, AV_LOG_DEBUG,

  514.                "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",

  515.                f->version, f->micro_version,

  516.                f->ac,

  517.                f->colorspace,

  518.                f->avctx->bits_per_raw_sample,

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

  520.                f->transparency,

  521.                f->num_h_slices, f->num_v_slices,

  522.                f->quant_table_count,

  523.                f->ec,

  524.                f->intra,

  525.                crc

  526.               );

  527.     return 0;

  528. }

  529. 

  530. static int read_header(FFV1Context *f)

  531. {

  532.     uint8_t state[CONTEXT_SIZE];

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

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

  535. 

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

  537. 

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

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

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

  541.         if (v >= 2) {

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

  543.             return AVERROR_INVALIDDATA;

  544.         }

  545.         f->version = v;

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

  547. 

  548.         if (f->ac == AC_RANGE_CUSTOM_TAB) {

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

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

  551.         }

  552. 

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

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

  555.         chroma_planes       = get_rac(c, state);

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

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

  558.         transparency        = get_rac(c, state);

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

  560.             transparency = 0;

  561. 

  562.         if (f->plane_count) {

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

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

  565.                 chroma_planes       != f->chroma_planes              ||

  566.                 chroma_h_shift      != f->chroma_h_shift             ||

  567.                 chroma_v_shift      != f->chroma_v_shift             ||

  568.                 transparency        != f->transparency) {

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

  570.                 return AVERROR_INVALIDDATA;

  571.             }

  572.         }

  573. 

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

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

  576.                    chroma_h_shift, chroma_v_shift);

  577.             return AVERROR_INVALIDDATA;

  578.         }

  579. 

  580.         f->colorspace                 = colorspace;

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

  582.         f->chroma_planes              = chroma_planes;

  583.         f->chroma_h_shift             = chroma_h_shift;

  584.         f->chroma_v_shift             = chroma_v_shift;

  585.         f->transparency               = transparency;

  586. 

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

  588.     }

  589. 

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

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

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

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

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

  595.                 f->packed_at_lsb = 1;

  596.                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY10;

  597.             } else if (f->avctx->bits_per_raw_sample == 12) {

  598.                 f->packed_at_lsb = 1;

  599.                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY12;

  600.             } else if (f->avctx->bits_per_raw_sample == 16) {

  601.                 f->packed_at_lsb = 1;

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

  603.             } else if (f->avctx->bits_per_raw_sample < 16) {

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

  605.             } else

  606.                 return AVERROR(ENOSYS);

  607.         } else if (f->transparency && !f->chroma_planes) {

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

  609.                 f->avctx->pix_fmt = AV_PIX_FMT_YA8;

  610.             else

  611.                 return AVERROR(ENOSYS);

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

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

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

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

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

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

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

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

  620.             }

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

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

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

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

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

  626.             }

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

  628.             f->packed_at_lsb = 1;

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

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

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

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

  633.             }

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

  635.             f->packed_at_lsb = 1;

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

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

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

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

  640.             }

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

  642.             f->packed_at_lsb = 1;

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

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

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

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

  647.             }

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

  649.             f->packed_at_lsb = 1;

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

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

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

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

  654.             }

  655.         } else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency) {

  656.             f->packed_at_lsb = 1;

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

  658.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P12; break;

  659.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P12; break;

  660.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P12; break;

  661.             }

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

  663.             f->packed_at_lsb = 1;

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

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

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

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

  668.             }

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

  670.             f->packed_at_lsb = 1;

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

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

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

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

  675.             }

  676.         }

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

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

  679.             av_log(f->avctx, AV_LOG_ERROR,

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

  681.             return AVERROR(ENOSYS);

  682.         }

  683.         if (     f->avctx->bits_per_raw_sample <=  8 && !f->transparency)

  684.             f->avctx->pix_fmt = AV_PIX_FMT_0RGB32;

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

  686.             f->avctx->pix_fmt = AV_PIX_FMT_RGB32;

  687.         else if (f->avctx->bits_per_raw_sample ==  9 && !f->transparency)

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

  689.         else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency)

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

  691.         else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency)

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

  693.         else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency)

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

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

  696.             f->avctx->pix_fmt = AV_PIX_FMT_GBRP16;

  697.             f->use32bit = 1;

  698.         }

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

  700.             f->avctx->pix_fmt = AV_PIX_FMT_GBRAP16;

  701.             f->use32bit = 1;

  702.         }

  703.     } else {

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

  705.         return AVERROR(ENOSYS);

  706.     }

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

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

  709.         return AVERROR(ENOSYS);

  710.     }

  711. 

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

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

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

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

  716.         if (context_count < 0) {

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

  718.             return AVERROR_INVALIDDATA;

  719.         }

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

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

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

  723.     } else {

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

  725.         for (f->slice_count = 0;

  726.              f->slice_count < MAX_SLICES && 3 + 5*!!f->ec < p - c->bytestream_start;

  727.              f->slice_count++) {

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

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

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

  731.                 break;

  732.             p -= size + trailer;

  733.         }

  734.     }

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

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

  737.         return AVERROR_INVALIDDATA;

  738.     }

  739. 

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

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

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

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

  744. 

  745.         fs->slice_damaged = 0;

  746. 

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

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

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

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

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

  752. 

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

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

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

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

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

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

  759.                 return AVERROR_INVALIDDATA;

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

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

  762.                 return AVERROR_INVALIDDATA;

  763.         }

  764. 

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

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

  767. 

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

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

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

  771.                     av_log(f->avctx, AV_LOG_ERROR,

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

  773.                     return AVERROR_INVALIDDATA;

  774.                 }

  775.                 p->quant_table_index = idx;

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

  777.                        sizeof(p->quant_table));

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

  779.             } else {

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

  781.             }

  782. 

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

  784.                 av_assert0(context_count >= 0);

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

  786.                     av_freep(&p->state);

  787.                     av_freep(&p->vlc_state);

  788.                 }

  789.                 p->context_count = context_count;

  790.             }

  791.         }

  792.     }

  793.     return 0;

  794. }

  795. 

  796. static av_cold int decode_init(AVCodecContext *avctx)

  797. {

  798.     FFV1Context *f = avctx->priv_data;

  799.     int ret;

  800. 

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

  802.         return ret;

  803. 

  804.     if (avctx->extradata_size > 0 && (ret = read_extra_header(f)) < 0)

  805.         return ret;

  806. 

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

  808.         return ret;

  809. 

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

  811. 

  812.     return 0;

  813. }

  814. 

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

  816. {

  817.     uint8_t *buf        = avpkt->data;

  818.     int buf_size        = avpkt->size;

  819.     FFV1Context *f      = avctx->priv_data;

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

  821.     int i, ret;

  822.     uint8_t keystate = 128;

  823.     uint8_t *buf_p;

  824.     AVFrame *p;

  825. 

  826.     if (f->last_picture.f)

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

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

  829. 

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

  831. 

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

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

  834.         p->interlaced_frame = 1;

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

  836.             p->top_field_first = 1;

  837.     }

  838. 

  839.     f->avctx = avctx;

  840.     ff_init_range_decoder(c, buf, buf_size);

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

  842. 

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

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

  845.         p->key_frame    = 1;

  846.         f->key_frame_ok = 0;

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

  848.             return ret;

  849.         f->key_frame_ok = 1;

  850.     } else {

  851.         if (!f->key_frame_ok) {

  852.             av_log(avctx, AV_LOG_ERROR,

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

  854.             return AVERROR_INVALIDDATA;

  855.         }

  856.         p->key_frame = 0;

  857.     }

  858. 

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

  860.         return ret;

  861. 

  862.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  865. 

  866.     ff_thread_finish_setup(avctx);

  867. 

  868.     buf_p = buf + buf_size;

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

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

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

  872.         int v;

  873. 

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

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

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

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

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

  879.             return AVERROR_INVALIDDATA;

  880.         }

  881.         buf_p -= v;

  882. 

  883.         if (f->ec) {

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

  885.             if (crc) {

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

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

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

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

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

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

  892.                 } else {

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

  894.                 }

  895.                 fs->slice_damaged = 1;

  896.             }

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

  898.                 av_log(avctx, AV_LOG_DEBUG, "slice %d, CRC: 0x%08"PRIX32"\n", i, AV_RB32(buf_p + v - 4));

  899.             }

  900.         }

  901. 

  902.         if (i) {

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

  904.         } else

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

  906. 

  907.         fs->avctx = avctx;

  908.         fs->cur = p;

  909.     }

  910. 

  911.     avctx->execute(avctx,

  912.                    decode_slice,

  913.                    &f->slice_context[0],

  914.                    NULL,

  915.                    f->slice_count,

  916.                    sizeof(void*));

  917. 

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

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

  920.         int j;

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

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

  923.             const uint8_t *src[4];

  924.             uint8_t *dst[4];

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

  926.             for (j = 0; j < desc->nb_components; j++) {

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

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

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

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

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

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

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

  934. 

  935.             }

  936.             if (desc->flags & AV_PIX_FMT_FLAG_PAL ||

  937.                 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) {

  938.                 dst[1] = p->data[1];

  939.                 src[1] = f->last_picture.f->data[1];

  940.             }

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

  942.                           f->last_picture.f->linesize,

  943.                           avctx->pix_fmt,

  944.                           fs->slice_width,

  945.                           fs->slice_height);

  946.         }

  947.     }

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

  949. 

  950.     f->picture_number++;

  951. 

  952.     if (f->last_picture.f)

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

  954.     f->cur = NULL;

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

  956.         return ret;

  957. 

  958.     *got_frame = 1;

  959. 

  960.     return buf_size;

  961. }

  962. 

  963. #if HAVE_THREADS

  964. static int init_thread_copy(AVCodecContext *avctx)

  965. {

  966.     FFV1Context *f = avctx->priv_data;

  967.     int i, ret;

  968. 

  969.     f->picture.f      = NULL;

  970.     f->last_picture.f = NULL;

  971.     f->sample_buffer  = NULL;

  972.     f->max_slice_count = 0;

  973.     f->slice_count = 0;

  974. 

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

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

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

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

  979.     }

  980. 

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

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

  983. 

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

  985.         return ret;

  986. 

  987.     return 0;

  988. }

  989. #endif

  990. 

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

  992. {

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

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

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

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

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

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

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

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

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

  1002. 

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

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

  1005.     fsdst->slice_damaged       = fssrc->slice_damaged;

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

  1007. 

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

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

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

  1011.     if (fsrc->version<3){

  1012.         fsdst->slice_x             = fssrc->slice_x;

  1013.         fsdst->slice_y             = fssrc->slice_y;

  1014.         fsdst->slice_width         = fssrc->slice_width;

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

  1016.     }

  1017. }

  1018. 

  1019. #if HAVE_THREADS

  1020. static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1021. {

  1022.     FFV1Context *fsrc = src->priv_data;

  1023.     FFV1Context *fdst = dst->priv_data;

  1024.     int i, ret;

  1025. 

  1026.     if (dst == src)

  1027.         return 0;

  1028. 

  1029.     {

  1030.         ThreadFrame picture = fdst->picture, last_picture = fdst->last_picture;

  1031.         uint8_t (*initial_states[MAX_QUANT_TABLES])[32];

  1032.         struct FFV1Context *slice_context[MAX_SLICES];

  1033.         memcpy(initial_states, fdst->initial_states, sizeof(fdst->initial_states));

  1034.         memcpy(slice_context,  fdst->slice_context , sizeof(fdst->slice_context));

  1035. 

  1036.         memcpy(fdst, fsrc, sizeof(*fdst));

  1037.         memcpy(fdst->initial_states, initial_states, sizeof(fdst->initial_states));

  1038.         memcpy(fdst->slice_context,  slice_context , sizeof(fdst->slice_context));

  1039.         fdst->picture      = picture;

  1040.         fdst->last_picture = last_picture;

  1041.         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

  1042.             FFV1Context *fssrc = fsrc->slice_context[i];

  1043.             FFV1Context *fsdst = fdst->slice_context[i];

  1044.             copy_fields(fsdst, fssrc, fsrc);

  1045.         }

  1046.         av_assert0(!fdst->plane[0].state);

  1047.         av_assert0(!fdst->sample_buffer);

  1048.     }

  1049. 

  1050.     av_assert1(fdst->max_slice_count == fsrc->max_slice_count);

  1051. 

  1052. 

  1053.     ff_thread_release_buffer(dst, &fdst->picture);

  1054.     if (fsrc->picture.f->data[0]) {

  1055.         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

  1056.             return ret;

  1057.     }

  1058. 

  1059.     fdst->fsrc = fsrc;

  1060. 

  1061.     return 0;

  1062. }

  1063. #endif

  1064. 

  1065. AVCodec ff_ffv1_decoder = {

  1066.     .name           = "ffv1",

  1067.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1068.     .type           = AVMEDIA_TYPE_VIDEO,

  1069.     .id             = AV_CODEC_ID_FFV1,

  1070.     .priv_data_size = sizeof(FFV1Context),

  1071.     .init           = decode_init,

  1072.     .close          = ff_ffv1_close,

  1073.     .decode         = decode_frame,

  1074.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),

  1075.     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

  1076.     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1077.                       AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,

  1078.     .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP

  1079. };