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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 "avcodec.h"

  34. #include "internal.h"

  35. #include "get_bits.h"

  36. #include "rangecoder.h"

  37. #include "golomb.h"

  38. #include "mathops.h"

  39. #include "ffv1.h"

  40. 

  41. static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,

  42.                                                int is_signed)

  43. {

  44.     if (get_rac(c, state + 0))

  45.         return 0;

  46.     else {

  47.         int i, e;

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

  87. 

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

  89. 

  90.     update_vlc_state(state, v);

  91. 

  92.     return ret;

  93. }

  94. 

  95. static int is_input_end(FFV1Context *s)

  96. {

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

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

  99.         if (c->overread > MAX_OVERREAD)

  100.             return AVERROR_INVALIDDATA;

  101.     } else {

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

  103.             return AVERROR_INVALIDDATA;

  104.     }

  105.     return 0;

  106. }

  107. 

  108. #define TYPE int16_t

  109. #define RENAME(name) name

  110. #include "ffv1dec_template.c"

  111. #undef TYPE

  112. #undef RENAME

  113. 

  114. #define TYPE int32_t

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

  116. #include "ffv1dec_template.c"

  117. 

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

  119.                          int w, int h, int stride, int plane_index,

  120.                          int pixel_stride)

  121. {

  122.     int x, y;

  123.     int16_t *sample[2];

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

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

  126. 

  127.     s->run_index = 0;

  128. 

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

  130. 

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

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

  133. 

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

  135.         sample[1] = temp;

  136. 

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

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

  139. 

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

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

  142.             if (ret < 0)

  143.                 return ret;

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

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

  146.         } else {

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

  148.             if (ret < 0)

  149.                 return ret;

  150.             if (s->packed_at_lsb) {

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

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

  153.                 }

  154.             } else {

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

  156.                     ((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);

  157.                 }

  158.             }

  159.         }

  160.     }

  161.     return 0;

  162. }

  163. 

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

  165. {

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

  167.     uint8_t state[CONTEXT_SIZE];

  168.     unsigned ps, i, context_count;

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

  170. 

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

  172. 

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

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

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

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

  177. 

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

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

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

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

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

  183.         return -1;

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

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

  186.         return -1;

  187. 

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

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

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

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

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

  193.             return -1;

  194.         }

  195.         p->quant_table_index = idx;

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

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

  198. 

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

  200.             av_freep(&p->state);

  201.             av_freep(&p->vlc_state);

  202.         }

  203.         p->context_count = context_count;

  204.     }

  205. 

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

  207.     if (ps == 1) {

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

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

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

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

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

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

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

  215.     }

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

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

  218. 

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

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

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

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

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

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

  225.     }

  226. 

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

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

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

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

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

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

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

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

  235.                 return AVERROR_INVALIDDATA;

  236.             }

  237.         }

  238.     }

  239. 

  240.     return 0;

  241. }

  242. 

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

  244. {

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

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

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

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

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

  250.     int i, si;

  251. 

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

  253.         ;

  254. 

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

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

  257. 

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

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

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

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

  262.         av_assert1(fsdst == fs);

  263. 

  264.         if (!p->key_frame)

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

  266. 

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

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

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

  270. 

  271.             av_free(pdst->state);

  272.             av_free(pdst->vlc_state);

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

  274.             pdst->state = NULL;

  275.             pdst->vlc_state = NULL;

  276. 

  277.             if (fssrc->ac) {

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

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

  280.             } else {

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

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

  283.             }

  284.         }

  285.     }

  286. 

  287.     fs->slice_rct_by_coef = 1;

  288.     fs->slice_rct_ry_coef = 1;

  289. 

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

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

  292.             return AVERROR(ENOMEM);

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

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

  295.             fs->slice_damaged = 1;

  296.             return AVERROR_INVALIDDATA;

  297.         }

  298.     }

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

  300.         return ret;

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

  302.         ff_ffv1_clear_slice_state(f, fs);

  303. 

  304.     width  = fs->slice_width;

  305.     height = fs->slice_height;

  306.     x      = fs->slice_x;

  307.     y      = fs->slice_y;

  308. 

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

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

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

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

  313.         init_get_bits(&fs->gb,

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

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

  316.     }

  317. 

  318.     av_assert1(width && height);

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

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

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

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

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

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

  325. 

  326.         if (f->chroma_planes) {

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

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

  329.         }

  330.         if (fs->transparency)

  331.             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);

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

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

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

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

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

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

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

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

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

  341.     } else {

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

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

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

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

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

  347.     }

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

  349.         int v;

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

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

  352.         if (v) {

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

  354.             fs->slice_damaged = 1;

  355.         }

  356.     }

  357. 

  358.     emms_c();

  359. 

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

  361. 

  362.     return 0;

  363. }

  364. 

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

  366. {

  367.     int v;

  368.     int i = 0;

  369.     uint8_t state[CONTEXT_SIZE];

  370. 

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

  372. 

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

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

  375. 

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

  377.             return AVERROR_INVALIDDATA;

  378. 

  379.         while (len--) {

  380.             quant_table[i] = scale * v;

  381.             i++;

  382.         }

  383.     }

  384. 

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

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

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

  388. 

  389.     return 2 * v - 1;

  390. }

  391. 

  392. static int read_quant_tables(RangeCoder *c,

  393.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  394. {

  395.     int i;

  396.     int context_count = 1;

  397. 

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

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

  400.         if (ret < 0)

  401.             return ret;

  402.         context_count *= ret;

  403.         if (context_count > 32768U) {

  404.             return AVERROR_INVALIDDATA;

  405.         }

  406.     }

  407.     return (context_count + 1) / 2;

  408. }

  409. 

  410. static int read_extra_header(FFV1Context *f)

  411. {

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

  413.     uint8_t state[CONTEXT_SIZE];

  414.     int i, j, k, ret;

  415.     uint8_t state2[32][CONTEXT_SIZE];

  416.     unsigned crc = 0;

  417. 

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

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

  420. 

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

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

  423. 

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

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

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

  427.         return AVERROR_INVALIDDATA;

  428.     }

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

  430.         c->bytestream_end -= 4;

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

  432.         if (f->micro_version < 0)

  433.             return AVERROR_INVALIDDATA;

  434.     }

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

  436. 

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

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

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

  440.     }

  441. 

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

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

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

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

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

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

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

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

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

  451. 

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

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

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

  455.         return AVERROR_INVALIDDATA;

  456.     }

  457. 

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

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

  460.        ) {

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

  462.         return AVERROR_INVALIDDATA;

  463.     }

  464. 

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

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

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

  468.         f->quant_table_count = 0;

  469.         return AVERROR_INVALIDDATA;

  470.     }

  471. 

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

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

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

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

  476.             return AVERROR_INVALIDDATA;

  477.         }

  478.     }

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

  480.         return ret;

  481. 

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

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

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

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

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

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

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

  489.                 }

  490.         }

  491. 

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

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

  494.         if (f->micro_version > 2)

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

  496.     }

  497. 

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

  499.         unsigned v;

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

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

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

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

  504.             return AVERROR_INVALIDDATA;

  505.         }

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

  507.     }

  508. 

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

  510.         av_log(f->avctx, AV_LOG_DEBUG,

  511.                "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",

  512.                f->version, f->micro_version,

  513.                f->ac,

  514.                f->colorspace,

  515.                f->avctx->bits_per_raw_sample,

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

  517.                f->transparency,

  518.                f->num_h_slices, f->num_v_slices,

  519.                f->quant_table_count,

  520.                f->ec,

  521.                f->intra,

  522.                crc

  523.               );

  524.     return 0;

  525. }

  526. 

  527. static int read_header(FFV1Context *f)

  528. {

  529.     uint8_t state[CONTEXT_SIZE];

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

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

  532. 

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

  534. 

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

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

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

  538.         if (v >= 2) {

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

  540.             return AVERROR_INVALIDDATA;

  541.         }

  542.         f->version = v;

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

  544. 

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

  546.             for (i = 1; i < 256; i++) {

  547.                 int st = get_symbol(c, state, 1) + c->one_state[i];

  548.                 if (st < 1 || st > 255) {

  549.                     av_log(f->avctx, AV_LOG_ERROR, "invalid state transition %d\n", st);

  550.                     return AVERROR_INVALIDDATA;

  551.                 }

  552.                 f->state_transition[i] = st;

  553.             }

  554.         }

  555. 

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

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

  558.         chroma_planes       = get_rac(c, state);

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

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

  561.         transparency        = get_rac(c, state);

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

  563.             transparency = 0;

  564. 

  565.         if (f->plane_count) {

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

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

  568.                 chroma_planes       != f->chroma_planes              ||

  569.                 chroma_h_shift      != f->chroma_h_shift             ||

  570.                 chroma_v_shift      != f->chroma_v_shift             ||

  571.                 transparency        != f->transparency) {

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

  573.                 return AVERROR_INVALIDDATA;

  574.             }

  575.         }

  576. 

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

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

  579.                    chroma_h_shift, chroma_v_shift);

  580.             return AVERROR_INVALIDDATA;

  581.         }

  582. 

  583.         f->colorspace                 = colorspace;

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

  585.         f->chroma_planes              = chroma_planes;

  586.         f->chroma_h_shift             = chroma_h_shift;

  587.         f->chroma_v_shift             = chroma_v_shift;

  588.         f->transparency               = transparency;

  589. 

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

  591.     }

  592. 

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

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

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

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

  597.             else if (f->avctx->bits_per_raw_sample == 9) {

  598.                 f->packed_at_lsb = 1;

  599.                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY9;

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

  601.                 f->packed_at_lsb = 1;

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

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

  604.                 f->packed_at_lsb = 1;

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

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

  607.                 f->packed_at_lsb = 1;

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

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

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

  611.             } else

  612.                 return AVERROR(ENOSYS);

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

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

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

  616.             else

  617.                 return AVERROR(ENOSYS);

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

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

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

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

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

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

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

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

  626.             }

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

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

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

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

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

  632.             }

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

  634.             f->packed_at_lsb = 1;

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

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

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

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

  639.             }

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

  641.             f->packed_at_lsb = 1;

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

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

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

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

  646.             }

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

  648.             f->packed_at_lsb = 1;

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

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

  651.             case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P10; break;

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

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

  654.             }

  655.         } else if (f->avctx->bits_per_raw_sample == 10 && 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_YUVA444P10; break;

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

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

  661.             }

  662.         } else if (f->avctx->bits_per_raw_sample == 12 && !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_YUV444P12; break;

  666.             case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P12; break;

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

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

  669.             }

  670.         } else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency) {

  671.             f->packed_at_lsb = 1;

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

  673.             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P14; break;

  674.             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P14; break;

  675.             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P14; break;

  676.             }

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

  678.             f->packed_at_lsb = 1;

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

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

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

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

  683.             }

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

  685.             f->packed_at_lsb = 1;

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

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

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

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

  690.             }

  691.         }

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

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

  694.             av_log(f->avctx, AV_LOG_ERROR,

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

  696.             return AVERROR(ENOSYS);

  697.         }

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

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

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

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

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

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

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

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

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

  707.             f->avctx->pix_fmt = AV_PIX_FMT_GBRAP10;

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

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

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

  711.             f->avctx->pix_fmt = AV_PIX_FMT_GBRAP12;

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

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

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

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

  716.             f->use32bit = 1;

  717.         }

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

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

  720.             f->use32bit = 1;

  721.         }

  722.     } else {

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

  724.         return AVERROR(ENOSYS);

  725.     }

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

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

  728.         return AVERROR(ENOSYS);

  729.     }

  730. 

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

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

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

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

  735.         if (context_count < 0) {

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

  737.             return AVERROR_INVALIDDATA;

  738.         }

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

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

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

  742.     } else {

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

  744.         for (f->slice_count = 0;

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

  746.              f->slice_count++) {

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

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

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

  750.                 break;

  751.             p -= size + trailer;

  752.         }

  753.     }

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

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

  756.         return AVERROR_INVALIDDATA;

  757.     }

  758. 

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

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

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

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

  763. 

  764.         fs->slice_damaged = 0;

  765. 

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

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

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

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

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

  771. 

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

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

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

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

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

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

  778.                 return AVERROR_INVALIDDATA;

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

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

  781.                 return AVERROR_INVALIDDATA;

  782.         }

  783. 

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

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

  786. 

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

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

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

  790.                     av_log(f->avctx, AV_LOG_ERROR,

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

  792.                     return AVERROR_INVALIDDATA;

  793.                 }

  794.                 p->quant_table_index = idx;

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

  796.                        sizeof(p->quant_table));

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

  798.             } else {

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

  800.             }

  801. 

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

  803.                 av_assert0(context_count >= 0);

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

  805.                     av_freep(&p->state);

  806.                     av_freep(&p->vlc_state);

  807.                 }

  808.                 p->context_count = context_count;

  809.             }

  810.         }

  811.     }

  812.     return 0;

  813. }

  814. 

  815. static av_cold int decode_init(AVCodecContext *avctx)

  816. {

  817.     FFV1Context *f = avctx->priv_data;

  818.     int ret;

  819. 

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

  821.         return ret;

  822. 

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

  824.         return ret;

  825. 

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

  827.         return ret;

  828. 

  829.     return 0;

  830. }

  831. 

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

  833. {

  834.     uint8_t *buf        = avpkt->data;

  835.     int buf_size        = avpkt->size;

  836.     FFV1Context *f      = avctx->priv_data;

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

  838.     int i, ret;

  839.     uint8_t keystate = 128;

  840.     uint8_t *buf_p;

  841.     AVFrame *p;

  842. 

  843.     if (f->last_picture.f)

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

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

  846. 

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

  848. 

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

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

  851.         p->interlaced_frame = 1;

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

  853.             p->top_field_first = 1;

  854.     }

  855. 

  856.     f->avctx = avctx;

  857.     ff_init_range_decoder(c, buf, buf_size);

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

  859. 

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

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

  862.         p->key_frame    = 1;

  863.         f->key_frame_ok = 0;

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

  865.             return ret;

  866.         f->key_frame_ok = 1;

  867.     } else {

  868.         if (!f->key_frame_ok) {

  869.             av_log(avctx, AV_LOG_ERROR,

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

  871.             return AVERROR_INVALIDDATA;

  872.         }

  873.         p->key_frame = 0;

  874.     }

  875. 

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

  877.         return ret;

  878. 

  879.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  882. 

  883.     ff_thread_finish_setup(avctx);

  884. 

  885.     buf_p = buf + buf_size;

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

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

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

  889.         int v;

  890. 

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

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

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

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

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

  896.             return AVERROR_INVALIDDATA;

  897.         }

  898.         buf_p -= v;

  899. 

  900.         if (f->ec) {

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

  902.             if (crc) {

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

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

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

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

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

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

  909.                 } else {

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

  911.                 }

  912.                 fs->slice_damaged = 1;

  913.             }

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

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

  916.             }

  917.         }

  918. 

  919.         if (i) {

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

  921.         } else

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

  923. 

  924.         fs->avctx = avctx;

  925.         fs->cur = p;

  926.     }

  927. 

  928.     avctx->execute(avctx,

  929.                    decode_slice,

  930.                    &f->slice_context[0],

  931.                    NULL,

  932.                    f->slice_count,

  933.                    sizeof(void*));

  934. 

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

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

  937.         int j;

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

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

  940.             const uint8_t *src[4];

  941.             uint8_t *dst[4];

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

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

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

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

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

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

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

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

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

  951. 

  952.             }

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

  954.                 desc->flags & FF_PSEUDOPAL) {

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

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

  957.             }

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

  959.                           f->last_picture.f->linesize,

  960.                           avctx->pix_fmt,

  961.                           fs->slice_width,

  962.                           fs->slice_height);

  963.         }

  964.     }

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

  966. 

  967.     f->picture_number++;

  968. 

  969.     if (f->last_picture.f)

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

  971.     f->cur = NULL;

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

  973.         return ret;

  974. 

  975.     *got_frame = 1;

  976. 

  977.     return buf_size;

  978. }

  979. 

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

  981. {

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

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

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

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

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

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

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

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

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

  991. 

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

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

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

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

  996. 

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

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

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

  1000.     if (fsrc->version<3){

  1001.         fsdst->slice_x             = fssrc->slice_x;

  1002.         fsdst->slice_y             = fssrc->slice_y;

  1003.         fsdst->slice_width         = fssrc->slice_width;

  1004.         fsdst->slice_height        = fssrc->slice_height;

  1005.     }

  1006. }

  1007. 

  1008. #if HAVE_THREADS

  1009. static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1010. {

  1011.     FFV1Context *fsrc = src->priv_data;

  1012.     FFV1Context *fdst = dst->priv_data;

  1013.     int i, ret;

  1014. 

  1015.     if (dst == src)

  1016.         return 0;

  1017. 

  1018.     {

  1019.         ThreadFrame picture = fdst->picture, last_picture = fdst->last_picture;

  1020.         uint8_t (*initial_states[MAX_QUANT_TABLES])[32];

  1021.         struct FFV1Context *slice_context[MAX_SLICES];

  1022.         memcpy(initial_states, fdst->initial_states, sizeof(fdst->initial_states));

  1023.         memcpy(slice_context,  fdst->slice_context , sizeof(fdst->slice_context));

  1024. 

  1025.         memcpy(fdst, fsrc, sizeof(*fdst));

  1026.         memcpy(fdst->initial_states, initial_states, sizeof(fdst->initial_states));

  1027.         memcpy(fdst->slice_context,  slice_context , sizeof(fdst->slice_context));

  1028.         fdst->picture      = picture;

  1029.         fdst->last_picture = last_picture;

  1030.         for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

  1031.             FFV1Context *fssrc = fsrc->slice_context[i];

  1032.             FFV1Context *fsdst = fdst->slice_context[i];

  1033.             copy_fields(fsdst, fssrc, fsrc);

  1034.         }

  1035.         av_assert0(!fdst->plane[0].state);

  1036.         av_assert0(!fdst->sample_buffer);

  1037.     }

  1038. 

  1039.     av_assert1(fdst->max_slice_count == fsrc->max_slice_count);

  1040. 

  1041. 

  1042.     ff_thread_release_buffer(dst, &fdst->picture);

  1043.     if (fsrc->picture.f->data[0]) {

  1044.         if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

  1045.             return ret;

  1046.     }

  1047. 

  1048.     fdst->fsrc = fsrc;

  1049. 

  1050.     return 0;

  1051. }

  1052. #endif

  1053. 

  1054. AVCodec ff_ffv1_decoder = {

  1055.     .name           = "ffv1",

  1056.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1057.     .type           = AVMEDIA_TYPE_VIDEO,

  1058.     .id             = AV_CODEC_ID_FFV1,

  1059.     .priv_data_size = sizeof(FFV1Context),

  1060.     .init           = decode_init,

  1061.     .close          = ff_ffv1_close,

  1062.     .decode         = decode_frame,

  1063.     .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

  1064.     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1065.                       AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,

  1066.     .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_ALLOCATE_PROGRESS,

  1067. };