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FFmpeg/libavcodec/ffv1dec.c

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  1. /*

  2.  * FFV1 decoder

  3.  *

  4.  * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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/pixdesc.h"

  30. #include "libavutil/crc.h"

  31. #include "libavutil/opt.h"

  32. #include "libavutil/imgutils.h"

  33. #include "libavutil/timer.h"

  34. #include "avcodec.h"

  35. #include "internal.h"

  36. #include "get_bits.h"

  37. #include "put_bits.h"

  38. #include "rangecoder.h"

  39. #include "golomb.h"

  40. #include "mathops.h"

  41. #include "ffv1.h"

  42. 

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

  44.                                                int is_signed)

  45. {

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

  47.         return 0;

  48.     else {

  49.         int i, e, a;

  50.         e = 0;

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

  52.             e++;

  53. 

  54.         a = 1;

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

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

  57. 

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

  59.         return (a ^ e) - e;

  60.     }

  61. }

  62. 

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

  64. {

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

  66. }

  67. 

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

  69.                                  int bits)

  70. {

  71.     int k, i, v, ret;

  72. 

  73.     i = state->count;

  74.     k = 0;

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

  76.         k++;

  77.         i += i;

  78.     }

  79. 

  80.     assert(k <= 8);

  81. 

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

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

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

  85. 

  86. #if 0 // JPEG LS

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

  88.         v ^= (-1);

  89. #else

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

  91. #endif

  92. 

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

  94. 

  95.     update_vlc_state(state, v);

  96. 

  97.     return ret;

  98. }

  99. 

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

  101.                                          int16_t *sample[2],

  102.                                          int plane_index, int bits)

  103. {

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

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

  106.     int x;

  107.     int run_count = 0;

  108.     int run_mode  = 0;

  109.     int run_index = s->run_index;

  110. 

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

  112.         int diff, context, sign;

  113. 

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

  115.         if (context < 0) {

  116.             context = -context;

  117.             sign    = 1;

  118.         } else

  119.             sign = 0;

  120. 

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

  122. 

  123.         if (s->ac) {

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

  125.         } else {

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

  127.                 run_mode = 1;

  128. 

  129.             if (run_mode) {

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

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

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

  133.                         if (x + run_count <= w)

  134.                             run_index++;

  135.                     } else {

  136.                         if (ff_log2_run[run_index])

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

  138.                         else

  139.                             run_count = 0;

  140.                         if (run_index)

  141.                             run_index--;

  142.                         run_mode = 2;

  143.                     }

  144.                 }

  145.                 run_count--;

  146.                 if (run_count < 0) {

  147.                     run_mode  = 0;

  148.                     run_count = 0;

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

  150.                                                bits);

  151.                     if (diff >= 0)

  152.                         diff++;

  153.                 } else

  154.                     diff = 0;

  155.             } else

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

  157. 

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

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

  160.         }

  161. 

  162.         if (sign)

  163.             diff = -diff;

  164. 

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

  166.                        ((1 << bits) - 1);

  167.     }

  168.     s->run_index = run_index;

  169. }

  170. 

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

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

  173. {

  174.     int x, y;

  175.     int16_t *sample[2];

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

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

  178. 

  179.     s->run_index = 0;

  180. 

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

  182. 

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

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

  185. 

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

  187.         sample[1] = temp;

  188. 

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

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

  191. 

  192. // { START_TIMER

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

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

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

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

  197.         } else {

  198.             decode_line(s, w, sample, plane_index,

  199.                         s->avctx->bits_per_raw_sample);

  200.             if (s->packed_at_lsb) {

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

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

  203.             } else {

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

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

  206.             }

  207.         }

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

  209.     }

  210. }

  211. 

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

  213.                              int stride[3])

  214. {

  215.     int x, y, p;

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

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

  218.     int bits = s->avctx->bits_per_raw_sample > 0

  219.                ? s->avctx->bits_per_raw_sample

  220.                : 8;

  221.     int offset = 1 << bits;

  222. 

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

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

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

  226.     }

  227. 

  228.     s->run_index = 0;

  229. 

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

  231. 

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

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

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

  235. 

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

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

  238. 

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

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

  241.             if (lbd)

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

  243.             else

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

  245.         }

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

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

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

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

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

  251. 

  252.             b -= offset;

  253.             r -= offset;

  254.             g -= (b + r) >> 2;

  255.             b += g;

  256.             r += g;

  257. 

  258.             if (lbd)

  259.                 *((uint32_t *)(src[0] + x * 4 + stride[0] * y)) = b +

  260.                     (g << 8) + (r << 16) + (a << 24);

  261.             else {

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

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

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

  265.             }

  266.         }

  267.     }

  268. }

  269. 

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

  271. {

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

  273.     uint8_t state[CONTEXT_SIZE];

  274.     unsigned ps, i, context_count;

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

  276. 

  277.     if (fs->ac > 1) {

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

  279.             fs->c.one_state[i]        = f->state_transition[i];

  280.             fs->c.zero_state[256 - i] = 256 - fs->c.one_state[i];

  281.         }

  282.     }

  283. 

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

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

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

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

  288. 

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

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

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

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

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

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

  295.         return AVERROR_INVALIDDATA;

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

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

  298.         return AVERROR_INVALIDDATA;

  299. 

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

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

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

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

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

  305.             return AVERROR_INVALIDDATA;

  306.         }

  307.         p->quant_table_index = idx;

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

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

  310. 

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

  312.             av_freep(&p->state);

  313.             av_freep(&p->vlc_state);

  314.         }

  315.         p->context_count = context_count;

  316.     }

  317. 

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

  319.     if (ps == 1) {

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

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

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

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

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

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

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

  327.     }

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

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

  330. 

  331.     return 0;

  332. }

  333. 

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

  335. {

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

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

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

  339.     const int ps = (av_pix_fmt_desc_get(c->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR)

  340.                    ? (c->bits_per_raw_sample > 8) + 1

  341.                    : 4;

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

  343. 

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

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

  346.             fs->slice_damaged = 1;

  347.             return AVERROR_INVALIDDATA;

  348.         }

  349.     }

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

  351.         return ret;

  352.     if (f->cur->key_frame)

  353.         ffv1_clear_slice_state(f, fs);

  354.     width  = fs->slice_width;

  355.     height = fs->slice_height;

  356.     x      = fs->slice_x;

  357.     y      = fs->slice_y;

  358. 

  359.     if (!fs->ac) {

  360.         if (f->version == 3 && f->minor_version > 1 || f->version > 3)

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

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

  363.         init_get_bits(&fs->gb, fs->c.bytestream_start + fs->ac_byte_count,

  364.                       (fs->c.bytestream_end - fs->c.bytestream_start -

  365.                        fs->ac_byte_count) * 8);

  366.     }

  367. 

  368.     av_assert1(width && height);

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

  370.         const int chroma_width  = -((-width) >> f->chroma_h_shift);

  371.         const int chroma_height = -((-height) >> f->chroma_v_shift);

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

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

  374.         decode_plane(fs, p->data[0] + ps * x + y * p->linesize[0], width,

  375.                      height, p->linesize[0],

  376.                      0);

  377. 

  378.         if (f->chroma_planes) {

  379.             decode_plane(fs, p->data[1] + ps * cx + cy * p->linesize[1],

  380.                          chroma_width, chroma_height, p->linesize[1],

  381.                          1);

  382.             decode_plane(fs, p->data[2] + ps * cx + cy * p->linesize[2],

  383.                          chroma_width, chroma_height, p->linesize[2],

  384.                          1);

  385.         }

  386.         if (fs->transparency)

  387.             decode_plane(fs, p->data[3] + ps * x + y * p->linesize[3], width,

  388.                          height, p->linesize[3],

  389.                          2);

  390.     } else {

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

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

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

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

  395.     }

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

  397.         int v;

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

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

  400.         if (v) {

  401.             av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n",

  402.                    v);

  403.             fs->slice_damaged = 1;

  404.         }

  405.     }

  406. 

  407.     emms_c();

  408. 

  409.     return 0;

  410. }

  411. 

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

  413. {

  414.     int v;

  415.     int i = 0;

  416.     uint8_t state[CONTEXT_SIZE];

  417. 

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

  419. 

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

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

  422. 

  423.         if (len > 128 - i)

  424.             return -1;

  425. 

  426.         while (len--) {

  427.             quant_table[i] = scale * v;

  428.             i++;

  429.         }

  430.     }

  431. 

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

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

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

  435. 

  436.     return 2 * v - 1;

  437. }

  438. 

  439. static int read_quant_tables(RangeCoder *c,

  440.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  441. {

  442.     int i;

  443.     int context_count = 1;

  444. 

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

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

  447.         if (context_count > 32768U) {

  448.             return -1;

  449.         }

  450.     }

  451.     return (context_count + 1) / 2;

  452. }

  453. 

  454. static int read_extra_header(FFV1Context *f)

  455. {

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

  457.     uint8_t state[CONTEXT_SIZE];

  458.     int i, j, k, ret;

  459.     uint8_t state2[32][CONTEXT_SIZE];

  460. 

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

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

  463. 

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

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

  466. 

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

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

  469.         c->bytestream_end -= 4;

  470.         f->minor_version   = get_symbol(c, state, 0);

  471.     }

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

  473. 

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

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

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

  477.     }

  478. 

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

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

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

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

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

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

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

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

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

  488. 

  489.     if (f->num_h_slices > (unsigned)f->width ||

  490.         f->num_v_slices > (unsigned)f->height) {

  491.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  492.         return AVERROR_INVALIDDATA;

  493.     }

  494. 

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

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

  497.         return AVERROR_INVALIDDATA;

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

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

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

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

  502.             return AVERROR_INVALIDDATA;

  503.         }

  504.     }

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

  506.         return ret;

  507. 

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

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

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

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

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

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

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

  515.                 }

  516.         }

  517. 

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

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

  520.     }

  521. 

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

  523.         unsigned v;

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

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

  526.         if (v) {

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

  528.             return AVERROR_INVALIDDATA;

  529.         }

  530.     }

  531. 

  532.     return 0;

  533. }

  534. 

  535. 

  536. static int read_header(FFV1Context *f)

  537. {

  538.     uint8_t state[CONTEXT_SIZE];

  539.     int i, j, context_count = -1;

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

  541. 

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

  543. 

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

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

  546.         if (v > 1) {

  547.             av_log(f->avctx, AV_LOG_ERROR,

  548.                    "invalid version %d in version 1 header\n", v);

  549.             return AVERROR_INVALIDDATA;

  550.         }

  551.         f->version = v;

  552. 

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

  554. 

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

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

  557.                 f->state_transition[i] =

  558.                     get_symbol(c, state, 1) + c->one_state[i];

  559.         }

  560. 

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

  562. 

  563.         if (f->version > 0)

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

  565. 

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

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

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

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

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

  571.     }

  572. 

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

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

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

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

  577.             else

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

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

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

  581.             case 0x00:

  582.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  583.                 break;

  584.             case 0x01:

  585.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV440P;

  586.                 break;

  587.             case 0x10:

  588.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  589.                 break;

  590.             case 0x11:

  591.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  592.                 break;

  593.             case 0x20:

  594.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  595.                 break;

  596.             case 0x22:

  597.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  598.                 break;

  599.             default:

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

  601.                 return AVERROR(ENOSYS);

  602.             }

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

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

  605.             case 0x00:

  606.                 f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P;

  607.                 break;

  608.             case 0x10:

  609.                 f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P;

  610.                 break;

  611.             case 0x11:

  612.                 f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;

  613.                 break;

  614.             default:

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

  616.                 return AVERROR(ENOSYS);

  617.             }

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

  619.             f->packed_at_lsb = 1;

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

  621.             case 0x00:

  622.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9;

  623.                 break;

  624.             case 0x10:

  625.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9;

  626.                 break;

  627.             case 0x11:

  628.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9;

  629.                 break;

  630.             default:

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

  632.                 return AVERROR(ENOSYS);

  633.             }

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

  635.             f->packed_at_lsb = 1;

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

  637.             case 0x00:

  638.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;

  639.                 break;

  640.             case 0x10:

  641.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;

  642.                 break;

  643.             case 0x11:

  644.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10;

  645.                 break;

  646.             default:

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

  648.                 return AVERROR(ENOSYS);

  649.             }

  650.         } else {

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

  652.             case 0x00:

  653.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  654.                 break;

  655.             case 0x10:

  656.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  657.                 break;

  658.             case 0x11:

  659.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  660.                 break;

  661.             default:

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

  663.                 return AVERROR(ENOSYS);

  664.             }

  665.         }

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

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

  668.             av_log(f->avctx, AV_LOG_ERROR,

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

  670.             return AVERROR(ENOSYS);

  671.         }

  672.         switch (f->avctx->bits_per_raw_sample) {

  673.         case 0:

  674.         case 8:

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

  676.             break;

  677.         case 9:

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

  679.             break;

  680.         case 10:

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

  682.             break;

  683.         default:

  684.             av_log(f->avctx, AV_LOG_ERROR,

  685.                    "bit depth %d not supported\n",

  686.                    f->avctx->bits_per_raw_sample);

  687.             return AVERROR(ENOSYS);

  688.         }

  689.     } else {

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

  691.         return AVERROR(ENOSYS);

  692.     }

  693. 

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

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

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

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

  698.         if (context_count < 0) {

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

  700.             return AVERROR_INVALIDDATA;

  701.         }

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

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

  704.     } else {

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

  706.         for (f->slice_count = 0;

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

  708.              f->slice_count++) {

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

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

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

  712.                 break;

  713.             p -= size + trailer;

  714.         }

  715.     }

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

  717.         av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n",

  718.                f->slice_count);

  719.         return AVERROR_INVALIDDATA;

  720.     }

  721. 

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

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

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

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

  726. 

  727.         fs->slice_damaged = 0;

  728. 

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

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

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

  732.             fs->slice_width =

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

  734.             fs->slice_height =

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

  736. 

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

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

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

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

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

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

  743.                 return AVERROR_INVALIDDATA;

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

  745.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height >

  746.                 f->height)

  747.                 return AVERROR_INVALIDDATA;

  748.         }

  749. 

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

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

  752. 

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

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

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

  756.                     av_log(f->avctx, AV_LOG_ERROR,

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

  758.                     return AVERROR_INVALIDDATA;

  759.                 }

  760.                 p->quant_table_index = idx;

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

  762.                        sizeof(p->quant_table));

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

  764.             } else {

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

  766.             }

  767. 

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

  769.                 av_assert0(context_count >= 0);

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

  771.                     av_freep(&p->state);

  772.                     av_freep(&p->vlc_state);

  773.                 }

  774.                 p->context_count = context_count;

  775.             }

  776.         }

  777.     }

  778.     return 0;

  779. }

  780. 

  781. static av_cold int ffv1_decode_init(AVCodecContext *avctx)

  782. {

  783.     FFV1Context *f = avctx->priv_data;

  784.     int ret;

  785. 

  786.     ffv1_common_init(avctx);

  787. 

  788.     f->last_picture = av_frame_alloc();

  789.     if (!f->last_picture)

  790.         return AVERROR(ENOMEM);

  791. 

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

  793.         return ret;

  794. 

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

  796.         return ret;

  797. 

  798.     return 0;

  799. }

  800. 

  801. static int ffv1_decode_frame(AVCodecContext *avctx, void *data,

  802.                              int *got_frame, AVPacket *avpkt)

  803. {

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

  805.     int buf_size        = avpkt->size;

  806.     FFV1Context *f      = avctx->priv_data;

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

  808.     int i, ret;

  809.     uint8_t keystate = 128;

  810.     const uint8_t *buf_p;

  811.     AVFrame *const p    = data;

  812. 

  813.     f->cur = p;

  814. 

  815.     ff_init_range_decoder(c, buf, buf_size);

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

  817. 

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

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

  820.         p->key_frame    = 1;

  821.         f->key_frame_ok = 0;

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

  823.             return ret;

  824.         f->key_frame_ok = 1;

  825.     } else {

  826.         if (!f->key_frame_ok) {

  827.             av_log(avctx, AV_LOG_ERROR,

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

  829.             return AVERROR_INVALIDDATA;

  830.         }

  831.         p->key_frame = 0;

  832.     }

  833. 

  834.     if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0) {

  835.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  836.         return ret;

  837.     }

  838. 

  839.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  840.         av_log(avctx, AV_LOG_DEBUG,

  841.                "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",

  842.                f->version, p->key_frame, f->ac, f->ec, f->slice_count,

  843.                f->avctx->bits_per_raw_sample);

  844. 

  845.     buf_p = buf + buf_size;

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

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

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

  849.         int v;

  850. 

  851.         if (i || f->version > 2)

  852.             v = AV_RB24(buf_p - trailer) + trailer;

  853.         else

  854.             v = buf_p - c->bytestream_start;

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

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

  857.             return AVERROR_INVALIDDATA;

  858.         }

  859.         buf_p -= v;

  860. 

  861.         if (f->ec) {

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

  863.             if (crc) {

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

  865.                 fs->slice_damaged = 1;

  866.             }

  867.         }

  868. 

  869.         if (i) {

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

  871.         } else

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

  873. 

  874.         fs->cur = p;

  875.     }

  876. 

  877.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL,

  878.                    f->slice_count,

  879.                    sizeof(void *));

  880. 

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

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

  883.         int j;

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

  885.             const uint8_t *src[4];

  886.             uint8_t *dst[4];

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

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

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

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

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

  892.                 src[j] = f->last_picture->data[j] +

  893.                          f->last_picture->linesize[j] *

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

  895.             }

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

  897.                           f->last_picture->linesize,

  898.                           avctx->pix_fmt, fs->slice_width,

  899.                           fs->slice_height);

  900.         }

  901.     }

  902. 

  903.     f->picture_number++;

  904. 

  905.     av_frame_unref(f->last_picture);

  906.     if ((ret = av_frame_ref(f->last_picture, p)) < 0)

  907.         return ret;

  908.     f->cur = NULL;

  909. 

  910.     *got_frame = 1;

  911. 

  912.     return buf_size;

  913. }

  914. 

  915. static av_cold int ffv1_decode_close(AVCodecContext *avctx)

  916. {

  917.     FFV1Context *s = avctx->priv_data;;

  918. 

  919.     av_frame_free(&s->last_picture);

  920. 

  921.     ffv1_close(avctx);

  922. 

  923.     return 0;

  924. }

  925. 

  926. AVCodec ff_ffv1_decoder = {

  927.     .name           = "ffv1",

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

  929.     .type           = AVMEDIA_TYPE_VIDEO,

  930.     .id             = AV_CODEC_ID_FFV1,

  931.     .priv_data_size = sizeof(FFV1Context),

  932.     .init           = ffv1_decode_init,

  933.     .close          = ffv1_decode_close,

  934.     .decode         = ffv1_decode_frame,

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

  936.                       CODEC_CAP_SLICE_THREADS,

  937. };