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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 "avcodec.h"

  34. #include "get_bits.h"

  35. #include "put_bits.h"

  36. #include "dsputil.h"

  37. #include "rangecoder.h"

  38. #include "golomb.h"

  39. #include "mathops.h"

  40. #include "ffv1.h"

  41. 

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

  43.                                                int is_signed)

  44. {

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

  46.         return 0;

  47.     else {

  48.         int i, e, a;

  49.         e = 0;

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

  51.             e++;

  52. 

  53.         a = 1;

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

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

  56. 

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

  58.         return (a ^ e) - e;

  59.     }

  60. }

  61. 

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

  63. {

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

  65. }

  66. 

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

  68.                                  int bits)

  69. {

  70.     int k, i, v, ret;

  71. 

  72.     i = state->count;

  73.     k = 0;

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

  75.         k++;

  76.         i += i;

  77.     }

  78. 

  79.     assert(k <= 8);

  80. 

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

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

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

  84. 

  85. #if 0 // JPEG LS

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

  87.         v ^= (-1);

  88. #else

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

  90. #endif

  91. 

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

  93. 

  94.     update_vlc_state(state, v);

  95. 

  96.     return ret;

  97. }

  98. 

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

  100.                                          int16_t *sample[2],

  101.                                          int plane_index, int bits)

  102. {

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

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

  105.     int x;

  106.     int run_count = 0;

  107.     int run_mode  = 0;

  108.     int run_index = s->run_index;

  109. 

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

  111.         int diff, context, sign;

  112. 

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

  114.         if (context < 0) {

  115.             context = -context;

  116.             sign    = 1;

  117.         } else

  118.             sign = 0;

  119. 

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

  121. 

  122.         if (s->ac) {

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

  124.         } else {

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

  126.                 run_mode = 1;

  127. 

  128.             if (run_mode) {

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

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

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

  132.                         if (x + run_count <= w)

  133.                             run_index++;

  134.                     } else {

  135.                         if (ff_log2_run[run_index])

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

  137.                         else

  138.                             run_count = 0;

  139.                         if (run_index)

  140.                             run_index--;

  141.                         run_mode = 2;

  142.                     }

  143.                 }

  144.                 run_count--;

  145.                 if (run_count < 0) {

  146.                     run_mode  = 0;

  147.                     run_count = 0;

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

  149.                                                bits);

  150.                     if (diff >= 0)

  151.                         diff++;

  152.                 } else

  153.                     diff = 0;

  154.             } else

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

  156. 

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

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

  159.         }

  160. 

  161.         if (sign)

  162.             diff = -diff;

  163. 

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

  165.                        ((1 << bits) - 1);

  166.     }

  167.     s->run_index = run_index;

  168. }

  169. 

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

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

  172. {

  173.     int x, y;

  174.     int16_t *sample[2];

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

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

  177. 

  178.     s->run_index = 0;

  179. 

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

  181. 

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

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

  184. 

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

  186.         sample[1] = temp;

  187. 

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

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

  190. 

  191. // { START_TIMER

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

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

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

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

  196.         } else {

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

  198.                         s->avctx->bits_per_raw_sample);

  199.             if (s->packed_at_lsb) {

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

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

  202.             } else {

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

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

  205.             }

  206.         }

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

  208.     }

  209. }

  210. 

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

  212.                              int stride[3])

  213. {

  214.     int x, y, p;

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

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

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

  218.                ? s->avctx->bits_per_raw_sample

  219.                : 8;

  220.     int offset = 1 << bits;

  221. 

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

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

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

  225.     }

  226. 

  227.     s->run_index = 0;

  228. 

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

  230. 

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

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

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

  234. 

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

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

  237. 

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

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

  240.             if (lbd)

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

  242.             else

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

  244.         }

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

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

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

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

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

  250. 

  251.             b -= offset;

  252.             r -= offset;

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

  254.             b += g;

  255.             r += g;

  256. 

  257.             if (lbd)

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

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

  260.             else {

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

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

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

  264.             }

  265.         }

  266.     }

  267. }

  268. 

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

  270. {

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

  272.     uint8_t state[CONTEXT_SIZE];

  273.     unsigned ps, i, context_count;

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

  275. 

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

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

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

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

  280.         }

  281.     }

  282. 

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

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

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

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

  287. 

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

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

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

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

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

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

  294.         return AVERROR_INVALIDDATA;

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

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

  297.         return AVERROR_INVALIDDATA;

  298. 

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

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

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

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

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

  304.             return AVERROR_INVALIDDATA;

  305.         }

  306.         p->quant_table_index = idx;

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

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

  309. 

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

  311.             av_freep(&p->state);

  312.             av_freep(&p->vlc_state);

  313.         }

  314.         p->context_count = context_count;

  315.     }

  316. 

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

  318.     if (ps == 1) {

  319.         f->picture.interlaced_frame = 1;

  320.         f->picture.top_field_first  = 1;

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

  322.         f->picture.interlaced_frame = 1;

  323.         f->picture.top_field_first  = 0;

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

  325.         f->picture.interlaced_frame = 0;

  326.     }

  327.     f->picture.sample_aspect_ratio.num = get_symbol(c, state, 0);

  328.     f->picture.sample_aspect_ratio.den = get_symbol(c, state, 0);

  329. 

  330.     return 0;

  331. }

  332. 

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

  334. {

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

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

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

  338.     const int ps = (av_pix_fmt_desc_get(c->pix_fmt)->flags & PIX_FMT_PLANAR)

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

  340.                    : 4;

  341.     AVFrame *const p = &f->picture;

  342. 

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

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

  345.             fs->slice_damaged = 1;

  346.             return AVERROR_INVALIDDATA;

  347.         }

  348.     }

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

  350.         return ret;

  351.     if (f->picture.key_frame)

  352.         ffv1_clear_slice_state(f, fs);

  353.     width  = fs->slice_width;

  354.     height = fs->slice_height;

  355.     x      = fs->slice_x;

  356.     y      = fs->slice_y;

  357. 

  358.     if (!fs->ac) {

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

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

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

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

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

  364.                        fs->ac_byte_count) * 8);

  365.     }

  366. 

  367.     av_assert1(width && height);

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

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

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

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

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

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

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

  375.                      0);

  376. 

  377.         if (f->chroma_planes) {

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

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

  380.                          1);

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

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

  383.                          1);

  384.         }

  385.         if (fs->transparency)

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

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

  388.                          2);

  389.     } else {

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

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

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

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

  394.     }

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

  396.         int v;

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

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

  399.         if (v) {

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

  401.                    v);

  402.             fs->slice_damaged = 1;

  403.         }

  404.     }

  405. 

  406.     emms_c();

  407. 

  408.     return 0;

  409. }

  410. 

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

  412. {

  413.     int v;

  414.     int i = 0;

  415.     uint8_t state[CONTEXT_SIZE];

  416. 

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

  418. 

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

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

  421. 

  422.         if (len > 128 - i)

  423.             return -1;

  424. 

  425.         while (len--) {

  426.             quant_table[i] = scale * v;

  427.             i++;

  428.         }

  429.     }

  430. 

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

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

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

  434. 

  435.     return 2 * v - 1;

  436. }

  437. 

  438. static int read_quant_tables(RangeCoder *c,

  439.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  440. {

  441.     int i;

  442.     int context_count = 1;

  443. 

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

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

  446.         if (context_count > 32768U) {

  447.             return -1;

  448.         }

  449.     }

  450.     return (context_count + 1) / 2;

  451. }

  452. 

  453. static int read_extra_header(FFV1Context *f)

  454. {

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

  456.     uint8_t state[CONTEXT_SIZE];

  457.     int i, j, k, ret;

  458.     uint8_t state2[32][CONTEXT_SIZE];

  459. 

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

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

  462. 

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

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

  465. 

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

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

  468.         c->bytestream_end -= 4;

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

  470.     }

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

  472. 

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

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

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

  476.     }

  477. 

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

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

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

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

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

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

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

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

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

  487. 

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

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

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

  491.         return AVERROR_INVALIDDATA;

  492.     }

  493. 

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

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

  496.         return AVERROR_INVALIDDATA;

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

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

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

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

  501.             return AVERROR_INVALIDDATA;

  502.         }

  503.     }

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

  505.         return ret;

  506. 

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

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

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

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

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

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

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

  514.                 }

  515.         }

  516. 

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

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

  519.     }

  520. 

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

  522.         unsigned v;

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

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

  525.         if (v) {

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

  527.             return AVERROR_INVALIDDATA;

  528.         }

  529.     }

  530. 

  531.     return 0;

  532. }

  533. 

  534. 

  535. static int read_header(FFV1Context *f)

  536. {

  537.     uint8_t state[CONTEXT_SIZE];

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

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

  540. 

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

  542. 

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

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

  545.         if (v > 1) {

  546.             av_log(f->avctx, AV_LOG_ERROR,

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

  548.             return AVERROR_INVALIDDATA;

  549.         }

  550.         f->version = v;

  551. 

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

  553. 

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

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

  556.                 f->state_transition[i] =

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

  558.         }

  559. 

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

  561. 

  562.         if (f->version > 0)

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

  564. 

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

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

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

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

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

  570.     }

  571. 

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

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

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

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

  576.             else

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

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

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

  580.             case 0x00:

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

  582.                 break;

  583.             case 0x01:

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

  585.                 break;

  586.             case 0x10:

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

  588.                 break;

  589.             case 0x11:

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

  591.                 break;

  592.             case 0x20:

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

  594.                 break;

  595.             case 0x22:

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

  597.                 break;

  598.             default:

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

  600.                 return AVERROR(ENOSYS);

  601.             }

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

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

  604.             case 0x00:

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

  606.                 break;

  607.             case 0x10:

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

  609.                 break;

  610.             case 0x11:

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

  612.                 break;

  613.             default:

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

  615.                 return AVERROR(ENOSYS);

  616.             }

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

  618.             f->packed_at_lsb = 1;

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

  620.             case 0x00:

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

  622.                 break;

  623.             case 0x10:

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

  625.                 break;

  626.             case 0x11:

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

  628.                 break;

  629.             default:

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

  631.                 return AVERROR(ENOSYS);

  632.             }

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

  634.             f->packed_at_lsb = 1;

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

  636.             case 0x00:

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

  638.                 break;

  639.             case 0x10:

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

  641.                 break;

  642.             case 0x11:

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

  644.                 break;

  645.             default:

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

  647.                 return AVERROR(ENOSYS);

  648.             }

  649.         } else {

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

  651.             case 0x00:

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

  653.                 break;

  654.             case 0x10:

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

  656.                 break;

  657.             case 0x11:

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

  659.                 break;

  660.             default:

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

  662.                 return AVERROR(ENOSYS);

  663.             }

  664.         }

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

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

  667.             av_log(f->avctx, AV_LOG_ERROR,

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

  669.             return AVERROR(ENOSYS);

  670.         }

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

  672.         case 8:

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

  674.             break;

  675.         case 9:

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

  677.             break;

  678.         case 10:

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

  680.             break;

  681.         default:

  682.             av_log(f->avctx, AV_LOG_ERROR,

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

  684.                    f->avctx->bits_per_raw_sample);

  685.             return AVERROR(ENOSYS);

  686.         }

  687.     } else {

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

  689.         return AVERROR(ENOSYS);

  690.     }

  691. 

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

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

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

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

  696.         if (context_count < 0) {

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

  698.             return AVERROR_INVALIDDATA;

  699.         }

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

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

  702.     } else {

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

  704.         for (f->slice_count = 0;

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

  706.              f->slice_count++) {

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

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

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

  710.                 break;

  711.             p -= size + trailer;

  712.         }

  713.     }

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

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

  716.                f->slice_count);

  717.         return AVERROR_INVALIDDATA;

  718.     }

  719. 

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

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

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

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

  724. 

  725.         fs->slice_damaged = 0;

  726. 

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

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

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

  730.             fs->slice_width =

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

  732.             fs->slice_height =

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

  734. 

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

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

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

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

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

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

  741.                 return AVERROR_INVALIDDATA;

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

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

  744.                 f->height)

  745.                 return AVERROR_INVALIDDATA;

  746.         }

  747. 

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

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

  750. 

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

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

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

  754.                     av_log(f->avctx, AV_LOG_ERROR,

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

  756.                     return AVERROR_INVALIDDATA;

  757.                 }

  758.                 p->quant_table_index = idx;

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

  760.                        sizeof(p->quant_table));

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

  762.             } else {

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

  764.             }

  765. 

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

  767.                 av_assert0(context_count >= 0);

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

  769.                     av_freep(&p->state);

  770.                     av_freep(&p->vlc_state);

  771.                 }

  772.                 p->context_count = context_count;

  773.             }

  774.         }

  775.     }

  776.     return 0;

  777. }

  778. 

  779. static av_cold int ffv1_decode_init(AVCodecContext *avctx)

  780. {

  781.     FFV1Context *f = avctx->priv_data;

  782.     int ret;

  783. 

  784.     ffv1_common_init(avctx);

  785. 

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

  787.         return ret;

  788. 

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

  790.         return ret;

  791. 

  792.     return 0;

  793. }

  794. 

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

  796.                              int *data_size, AVPacket *avpkt)

  797. {

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

  799.     int buf_size        = avpkt->size;

  800.     FFV1Context *f      = avctx->priv_data;

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

  802.     AVFrame *const p    = &f->picture;

  803.     int i, ret;

  804.     uint8_t keystate = 128;

  805.     const uint8_t *buf_p;

  806. 

  807.     AVFrame *picture = data;

  808. 

  809.     /* release previously stored data */

  810.     if (p->data[0])

  811.         avctx->release_buffer(avctx, p);

  812. 

  813.     ff_init_range_decoder(c, buf, buf_size);

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

  815. 

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

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

  818.         p->key_frame    = 1;

  819.         f->key_frame_ok = 0;

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

  821.             return ret;

  822.         f->key_frame_ok = 1;

  823.     } else {

  824.         if (!f->key_frame_ok) {

  825.             av_log(avctx, AV_LOG_ERROR,

  826.                    "Cant decode non keyframe without valid keyframe\n");

  827.             return AVERROR_INVALIDDATA;

  828.         }

  829.         p->key_frame = 0;

  830.     }

  831. 

  832.     p->reference = 3; //for error concealment

  833.     if ((ret = avctx->get_buffer(avctx, p)) < 0) {

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

  835.         return ret;

  836.     }

  837. 

  838.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  839.         av_log(avctx, AV_LOG_DEBUG,

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

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

  842.                f->avctx->bits_per_raw_sample);

  843. 

  844.     buf_p = buf + buf_size;

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

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

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

  848.         int v;

  849. 

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

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

  852.         else

  853.             v = buf_p - c->bytestream_start;

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

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

  856.             return AVERROR_INVALIDDATA;

  857.         }

  858.         buf_p -= v;

  859. 

  860.         if (f->ec) {

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

  862.             if (crc) {

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

  864.                 fs->slice_damaged = 1;

  865.             }

  866.         }

  867. 

  868.         if (i) {

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

  870.         } else

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

  872.     }

  873. 

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

  875.                    f->slice_count,

  876.                    sizeof(void *));

  877. 

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

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

  880.         int j;

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

  882.             const uint8_t *src[4];

  883.             uint8_t *dst[4];

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

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

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

  887.                 dst[j] = f->picture.data[j] + f->picture.linesize[j] *

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

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

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

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

  892.             }

  893.             av_image_copy(dst, f->picture.linesize, (const uint8_t **)src,

  894.                           f->last_picture.linesize,

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

  896.                           fs->slice_height);

  897.         }

  898.     }

  899. 

  900.     f->picture_number++;

  901. 

  902.     *picture   = *p;

  903.     *data_size = sizeof(AVFrame);

  904. 

  905.     FFSWAP(AVFrame, f->picture, f->last_picture);

  906. 

  907.     return buf_size;

  908. }

  909. 

  910. AVCodec ff_ffv1_decoder = {

  911.     .name           = "ffv1",

  912.     .type           = AVMEDIA_TYPE_VIDEO,

  913.     .id             = AV_CODEC_ID_FFV1,

  914.     .priv_data_size = sizeof(FFV1Context),

  915.     .init           = ffv1_decode_init,

  916.     .close          = ffv1_close,

  917.     .decode         = ffv1_decode_frame,

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

  919.                       CODEC_CAP_SLICE_THREADS,

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

  921. };