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

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

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

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

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

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

  337.     }

  338. 

  339.     return 0;

  340. }

  341. 

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

  343. {

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

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

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

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

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

  349.                    : 4;

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

  351. 

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

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

  354.             fs->slice_damaged = 1;

  355.             return AVERROR_INVALIDDATA;

  356.         }

  357.     }

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

  359.         return ret;

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

  361.         ffv1_clear_slice_state(f, fs);

  362.     width  = fs->slice_width;

  363.     height = fs->slice_height;

  364.     x      = fs->slice_x;

  365.     y      = fs->slice_y;

  366. 

  367.     if (!fs->ac) {

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

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

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

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

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

  373.                        fs->ac_byte_count) * 8);

  374.     }

  375. 

  376.     av_assert1(width && height);

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

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

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

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

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

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

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

  384.                      0);

  385. 

  386.         if (f->chroma_planes) {

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

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

  389.                          1);

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

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

  392.                          1);

  393.         }

  394.         if (fs->transparency)

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

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

  397.                          2);

  398.     } else {

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

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

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

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

  403.     }

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

  405.         int v;

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

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

  408.         if (v) {

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

  410.                    v);

  411.             fs->slice_damaged = 1;

  412.         }

  413.     }

  414. 

  415.     emms_c();

  416. 

  417.     return 0;

  418. }

  419. 

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

  421. {

  422.     int v;

  423.     int i = 0;

  424.     uint8_t state[CONTEXT_SIZE];

  425. 

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

  427. 

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

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

  430. 

  431.         if (len > 128 - i)

  432.             return -1;

  433. 

  434.         while (len--) {

  435.             quant_table[i] = scale * v;

  436.             i++;

  437.         }

  438.     }

  439. 

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

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

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

  443. 

  444.     return 2 * v - 1;

  445. }

  446. 

  447. static int read_quant_tables(RangeCoder *c,

  448.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  449. {

  450.     int i;

  451.     int context_count = 1;

  452. 

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

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

  455.         if (context_count > 32768U) {

  456.             return -1;

  457.         }

  458.     }

  459.     return (context_count + 1) / 2;

  460. }

  461. 

  462. static int read_extra_header(FFV1Context *f)

  463. {

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

  465.     uint8_t state[CONTEXT_SIZE];

  466.     int i, j, k, ret;

  467.     uint8_t state2[32][CONTEXT_SIZE];

  468. 

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

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

  471. 

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

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

  474. 

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

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

  477.         c->bytestream_end -= 4;

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

  479.     }

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

  481. 

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

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

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

  485.     }

  486. 

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

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

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

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

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

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

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

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

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

  496. 

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

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

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

  500.         return AVERROR_INVALIDDATA;

  501.     }

  502. 

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

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

  505.         return AVERROR_INVALIDDATA;

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

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

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

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

  510.             return AVERROR_INVALIDDATA;

  511.         }

  512.     }

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

  514.         return ret;

  515. 

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

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

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

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

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

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

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

  523.                 }

  524.         }

  525. 

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

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

  528.     }

  529. 

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

  531.         unsigned v;

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

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

  534.         if (v) {

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

  536.             return AVERROR_INVALIDDATA;

  537.         }

  538.     }

  539. 

  540.     return 0;

  541. }

  542. 

  543. 

  544. static int read_header(FFV1Context *f)

  545. {

  546.     uint8_t state[CONTEXT_SIZE];

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

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

  549. 

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

  551. 

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

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

  554.         if (v > 1) {

  555.             av_log(f->avctx, AV_LOG_ERROR,

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

  557.             return AVERROR_INVALIDDATA;

  558.         }

  559.         f->version = v;

  560. 

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

  562. 

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

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

  565.                 f->state_transition[i] =

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

  567.         }

  568. 

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

  570. 

  571.         if (f->version > 0)

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

  573. 

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

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

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

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

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

  579.     }

  580. 

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

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

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

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

  585.             else

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

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

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

  589.             case 0x00:

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

  591.                 break;

  592.             case 0x01:

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

  594.                 break;

  595.             case 0x10:

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

  597.                 break;

  598.             case 0x11:

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

  600.                 break;

  601.             case 0x20:

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

  603.                 break;

  604.             case 0x22:

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

  606.                 break;

  607.             default:

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

  609.                 return AVERROR(ENOSYS);

  610.             }

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

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

  613.             case 0x00:

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

  615.                 break;

  616.             case 0x10:

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

  618.                 break;

  619.             case 0x11:

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

  621.                 break;

  622.             default:

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

  624.                 return AVERROR(ENOSYS);

  625.             }

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

  627.             f->packed_at_lsb = 1;

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

  629.             case 0x00:

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

  631.                 break;

  632.             case 0x10:

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

  634.                 break;

  635.             case 0x11:

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

  637.                 break;

  638.             default:

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

  640.                 return AVERROR(ENOSYS);

  641.             }

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

  643.             f->packed_at_lsb = 1;

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

  645.             case 0x00:

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

  647.                 break;

  648.             case 0x10:

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

  650.                 break;

  651.             case 0x11:

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

  653.                 break;

  654.             default:

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

  656.                 return AVERROR(ENOSYS);

  657.             }

  658.         } else {

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

  660.             case 0x00:

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

  662.                 break;

  663.             case 0x10:

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

  665.                 break;

  666.             case 0x11:

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

  668.                 break;

  669.             default:

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

  671.                 return AVERROR(ENOSYS);

  672.             }

  673.         }

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

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

  676.             av_log(f->avctx, AV_LOG_ERROR,

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

  678.             return AVERROR(ENOSYS);

  679.         }

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

  681.         case 0:

  682.         case 8:

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

  684.             break;

  685.         case 9:

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

  687.             break;

  688.         case 10:

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

  690.             break;

  691.         default:

  692.             av_log(f->avctx, AV_LOG_ERROR,

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

  694.                    f->avctx->bits_per_raw_sample);

  695.             return AVERROR(ENOSYS);

  696.         }

  697.     } else {

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

  699.         return AVERROR(ENOSYS);

  700.     }

  701. 

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

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

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

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

  706.         if (context_count < 0) {

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

  708.             return AVERROR_INVALIDDATA;

  709.         }

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

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

  712.     } else {

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

  714.         for (f->slice_count = 0;

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

  716.              f->slice_count++) {

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

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

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

  720.                 break;

  721.             p -= size + trailer;

  722.         }

  723.     }

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

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

  726.                f->slice_count);

  727.         return AVERROR_INVALIDDATA;

  728.     }

  729. 

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

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

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

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

  734. 

  735.         fs->slice_damaged = 0;

  736. 

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

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

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

  740.             fs->slice_width =

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

  742.             fs->slice_height =

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

  744. 

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

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

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

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

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

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

  751.                 return AVERROR_INVALIDDATA;

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

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

  754.                 f->height)

  755.                 return AVERROR_INVALIDDATA;

  756.         }

  757. 

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

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

  760. 

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

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

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

  764.                     av_log(f->avctx, AV_LOG_ERROR,

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

  766.                     return AVERROR_INVALIDDATA;

  767.                 }

  768.                 p->quant_table_index = idx;

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

  770.                        sizeof(p->quant_table));

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

  772.             } else {

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

  774.             }

  775. 

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

  777.                 av_assert0(context_count >= 0);

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

  779.                     av_freep(&p->state);

  780.                     av_freep(&p->vlc_state);

  781.                 }

  782.                 p->context_count = context_count;

  783.             }

  784.         }

  785.     }

  786.     return 0;

  787. }

  788. 

  789. static av_cold int ffv1_decode_init(AVCodecContext *avctx)

  790. {

  791.     FFV1Context *f = avctx->priv_data;

  792.     int ret;

  793. 

  794.     ffv1_common_init(avctx);

  795. 

  796.     f->last_picture = av_frame_alloc();

  797.     if (!f->last_picture)

  798.         return AVERROR(ENOMEM);

  799. 

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

  801.         return ret;

  802. 

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

  804.         return ret;

  805. 

  806.     return 0;

  807. }

  808. 

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

  810.                              int *got_frame, AVPacket *avpkt)

  811. {

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

  813.     int buf_size        = avpkt->size;

  814.     FFV1Context *f      = avctx->priv_data;

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

  816.     int i, ret;

  817.     uint8_t keystate = 128;

  818.     const uint8_t *buf_p;

  819.     AVFrame *const p    = data;

  820. 

  821.     f->cur = p;

  822. 

  823.     ff_init_range_decoder(c, buf, buf_size);

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

  825. 

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

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

  828.         p->key_frame    = 1;

  829.         f->key_frame_ok = 0;

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

  831.             return ret;

  832.         f->key_frame_ok = 1;

  833.     } else {

  834.         if (!f->key_frame_ok) {

  835.             av_log(avctx, AV_LOG_ERROR,

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

  837.             return AVERROR_INVALIDDATA;

  838.         }

  839.         p->key_frame = 0;

  840.     }

  841. 

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

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

  844.         return ret;

  845.     }

  846. 

  847.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  848.         av_log(avctx, AV_LOG_DEBUG,

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

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

  851.                f->avctx->bits_per_raw_sample);

  852. 

  853.     buf_p = buf + buf_size;

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

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

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

  857.         int v;

  858. 

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

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

  861.         else

  862.             v = buf_p - c->bytestream_start;

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

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

  865.             return AVERROR_INVALIDDATA;

  866.         }

  867.         buf_p -= v;

  868. 

  869.         if (f->ec) {

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

  871.             if (crc) {

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

  873.                 fs->slice_damaged = 1;

  874.             }

  875.         }

  876. 

  877.         if (i) {

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

  879.         } else

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

  881. 

  882.         fs->cur = p;

  883.     }

  884. 

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

  886.                    f->slice_count,

  887.                    sizeof(void *));

  888. 

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

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

  891.         int j;

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

  893.             const uint8_t *src[4];

  894.             uint8_t *dst[4];

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

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

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

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

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

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

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

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

  903.             }

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

  905.                           f->last_picture->linesize,

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

  907.                           fs->slice_height);

  908.         }

  909.     }

  910. 

  911.     f->picture_number++;

  912. 

  913.     av_frame_unref(f->last_picture);

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

  915.         return ret;

  916.     f->cur = NULL;

  917. 

  918.     *got_frame = 1;

  919. 

  920.     return buf_size;

  921. }

  922. 

  923. static av_cold int ffv1_decode_close(AVCodecContext *avctx)

  924. {

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

  926. 

  927.     av_frame_free(&s->last_picture);

  928. 

  929.     ffv1_close(avctx);

  930. 

  931.     return 0;

  932. }

  933. 

  934. AVCodec ff_ffv1_decoder = {

  935.     .name           = "ffv1",

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

  937.     .type           = AVMEDIA_TYPE_VIDEO,

  938.     .id             = AV_CODEC_ID_FFV1,

  939.     .priv_data_size = sizeof(FFV1Context),

  940.     .init           = ffv1_decode_init,

  941.     .close          = ffv1_decode_close,

  942.     .decode         = ffv1_decode_frame,

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

  944.                       CODEC_CAP_SLICE_THREADS,

  945. };