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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 FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * FF Video Codec 1 (a lossless codec) decoder

  26.  */

  27. 

  28. #include "libavutil/avassert.h"

  29. #include "libavutil/crc.h"

  30. #include "libavutil/opt.h"

  31. #include "libavutil/imgutils.h"

  32. #include "libavutil/pixdesc.h"

  33. #include "libavutil/timer.h"

  34. #include "avcodec.h"

  35. #include "internal.h"

  36. #include "get_bits.h"

  37. #include "rangecoder.h"

  38. #include "golomb.h"

  39. #include "mathops.h"

  40. #include "ffv1.h"

  41. 

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

  43.                                                int is_signed)

  44. {

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

  46.         return 0;

  47.     else {

  48.         int i, e, 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.     v = get_sr_golomb(gb, k, 12, bits);

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

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

  82. 

  83. #if 0 // JPEG LS

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

  85.         v ^= (-1);

  86. #else

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

  88. #endif

  89. 

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

  91. 

  92.     update_vlc_state(state, v);

  93. 

  94.     return ret;

  95. }

  96. 

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

  98.                                          int16_t *sample[2],

  99.                                          int plane_index, int bits)

  100. {

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

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

  103.     int x;

  104.     int run_count = 0;

  105.     int run_mode  = 0;

  106.     int run_index = s->run_index;

  107. 

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

  109.         int diff, context, sign;

  110. 

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

  112.         if (context < 0) {

  113.             context = -context;

  114.             sign    = 1;

  115.         } else

  116.             sign = 0;

  117. 

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

  119. 

  120.         if (s->ac) {

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

  122.         } else {

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

  124.                 run_mode = 1;

  125. 

  126.             if (run_mode) {

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

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

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

  130.                         if (x + run_count <= w)

  131.                             run_index++;

  132.                     } else {

  133.                         if (ff_log2_run[run_index])

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

  135.                         else

  136.                             run_count = 0;

  137.                         if (run_index)

  138.                             run_index--;

  139.                         run_mode = 2;

  140.                     }

  141.                 }

  142.                 run_count--;

  143.                 if (run_count < 0) {

  144.                     run_mode  = 0;

  145.                     run_count = 0;

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

  147.                                                bits);

  148.                     if (diff >= 0)

  149.                         diff++;

  150.                 } else

  151.                     diff = 0;

  152.             } else

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

  154. 

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

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

  157.         }

  158. 

  159.         if (sign)

  160.             diff = -diff;

  161. 

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

  163.                        ((1 << bits) - 1);

  164.     }

  165.     s->run_index = run_index;

  166. }

  167. 

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

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

  170. {

  171.     int x, y;

  172.     int16_t *sample[2];

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

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

  175. 

  176.     s->run_index = 0;

  177. 

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

  179. 

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

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

  182. 

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

  184.         sample[1] = temp;

  185. 

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

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

  188. 

  189. // { START_TIMER

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

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

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

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

  194.         } else {

  195.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  196.             if (s->packed_at_lsb) {

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

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

  199.                 }

  200.             } else {

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

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

  203.                 }

  204.             }

  205.         }

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

  207.     }

  208. }

  209. 

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

  211. {

  212.     int x, y, p;

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

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

  215.     int bits   = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;

  216.     int offset = 1 << bits;

  217. 

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

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

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

  221.     }

  222. 

  223.     s->run_index = 0;

  224. 

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

  226. 

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

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

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

  230. 

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

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

  233. 

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

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

  236.             if (lbd)

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

  238.             else

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

  240.         }

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

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

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

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

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

  246. 

  247.             b -= offset;

  248.             r -= offset;

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

  250.             b += g;

  251.             r += g;

  252. 

  253.             if (lbd)

  254.                 *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);

  255.             else {

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

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

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

  259.             }

  260.         }

  261.     }

  262. }

  263. 

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

  265. {

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

  267.     uint8_t state[CONTEXT_SIZE];

  268.     unsigned ps, i, context_count;

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

  270. 

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

  272. 

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

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

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

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

  277. 

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

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

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

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

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

  283.         return -1;

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

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

  286.         return -1;

  287. 

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

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

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

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

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

  293.             return -1;

  294.         }

  295.         p->quant_table_index = idx;

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

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

  298. 

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

  300.             av_freep(&p->state);

  301.             av_freep(&p->vlc_state);

  302.         }

  303.         p->context_count = context_count;

  304.     }

  305. 

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

  307.     if (ps == 1) {

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

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

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

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

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

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

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

  315.     }

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

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

  318. 

  319.     return 0;

  320. }

  321. 

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

  323. {

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

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

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

  327.     const int ps      = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step_minus1 + 1;

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

  329. 

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

  331.         if (ffv1_init_slice_state(f, fs) < 0)

  332.             return AVERROR(ENOMEM);

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

  334.             fs->slice_damaged = 1;

  335.             return AVERROR_INVALIDDATA;

  336.         }

  337.     }

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

  339.         return ret;

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

  341.         ffv1_clear_slice_state(f, fs);

  342. 

  343.     width  = fs->slice_width;

  344.     height = fs->slice_height;

  345.     x      = fs->slice_x;

  346.     y      = fs->slice_y;

  347. 

  348.     if (!fs->ac) {

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

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

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

  352.         init_get_bits(&fs->gb,

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

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

  355.     }

  356. 

  357.     av_assert1(width && height);

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

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

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

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

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

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

  364. 

  365.         if (f->chroma_planes) {

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

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

  368.         }

  369.         if (fs->transparency)

  370.             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  371.     } else {

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

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

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

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

  376.     }

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

  378.         int v;

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

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

  381.         if (v) {

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

  383.             fs->slice_damaged = 1;

  384.         }

  385.     }

  386. 

  387.     emms_c();

  388. 

  389.     return 0;

  390. }

  391. 

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

  393. {

  394.     int v;

  395.     int i = 0;

  396.     uint8_t state[CONTEXT_SIZE];

  397. 

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

  399. 

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

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

  402. 

  403.         if (len > 128 - i)

  404.             return AVERROR_INVALIDDATA;

  405. 

  406.         while (len--) {

  407.             quant_table[i] = scale * v;

  408.             i++;

  409.         }

  410.     }

  411. 

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

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

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

  415. 

  416.     return 2 * v - 1;

  417. }

  418. 

  419. static int read_quant_tables(RangeCoder *c,

  420.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  421. {

  422.     int i;

  423.     int context_count = 1;

  424. 

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

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

  427.         if (context_count > 32768U) {

  428.             return AVERROR_INVALIDDATA;

  429.         }

  430.     }

  431.     return (context_count + 1) / 2;

  432. }

  433. 

  434. static int read_extra_header(FFV1Context *f)

  435. {

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

  437.     uint8_t state[CONTEXT_SIZE];

  438.     int i, j, k, ret;

  439.     uint8_t state2[32][CONTEXT_SIZE];

  440. 

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

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

  443. 

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

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

  446. 

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

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

  449.         c->bytestream_end -= 4;

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

  451.     }

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

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

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

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

  456.     }

  457. 

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

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

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

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

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

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

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

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

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

  467. 

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

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

  470.        ) {

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

  472.         return AVERROR_INVALIDDATA;

  473.     }

  474. 

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

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

  477.         return AVERROR_INVALIDDATA;

  478. 

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

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

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

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

  483.             return AVERROR_INVALIDDATA;

  484.         }

  485.     }

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

  487.         return ret;

  488. 

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

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

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

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

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

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

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

  496.                 }

  497.         }

  498. 

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

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

  501.     }

  502. 

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

  504.         unsigned v;

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

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

  507.         if (v) {

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

  509.             return AVERROR_INVALIDDATA;

  510.         }

  511.     }

  512. 

  513.     return 0;

  514. }

  515. 

  516. static int read_header(FFV1Context *f)

  517. {

  518.     uint8_t state[CONTEXT_SIZE];

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

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

  521. 

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

  523. 

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

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

  526.         if (v >= 2) {

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

  528.             return AVERROR_INVALIDDATA;

  529.         }

  530.         f->version = v;

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

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

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

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

  535.         }

  536. 

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

  538. 

  539.         if (f->version > 0)

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

  541. 

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

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

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

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

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

  547.     }

  548. 

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

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

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

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

  553.             else

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

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

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

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

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

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

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

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

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

  563.             default:

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

  565.                 return AVERROR(ENOSYS);

  566.             }

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

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

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

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

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

  572.             default:

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

  574.                 return AVERROR(ENOSYS);

  575.             }

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

  577.             f->packed_at_lsb = 1;

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

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

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

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

  582.             default:

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

  584.                 return AVERROR(ENOSYS);

  585.             }

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

  587.             f->packed_at_lsb = 1;

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

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

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

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

  592.             default:

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

  594.                 return AVERROR(ENOSYS);

  595.             }

  596.         } else {

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

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

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

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

  601.             default:

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

  603.                 return AVERROR(ENOSYS);

  604.             }

  605.         }

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

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

  608.             av_log(f->avctx, AV_LOG_ERROR,

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

  610.             return AVERROR(ENOSYS);

  611.         }

  612.         if (     f->avctx->bits_per_raw_sample ==  9)

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

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

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

  616.         else if (f->avctx->bits_per_raw_sample == 12)

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

  618.         else if (f->avctx->bits_per_raw_sample == 14)

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

  620.         else

  621.         if (f->transparency) f->avctx->pix_fmt = AV_PIX_FMT_RGB32;

  622.         else                 f->avctx->pix_fmt = AV_PIX_FMT_0RGB32;

  623.     } else {

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

  625.         return AVERROR(ENOSYS);

  626.     }

  627. 

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

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

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

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

  632.         if (context_count < 0) {

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

  634.             return AVERROR_INVALIDDATA;

  635.         }

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

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

  638.     } else {

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

  640.         for (f->slice_count = 0;

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

  642.              f->slice_count++) {

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

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

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

  646.                 break;

  647.             p -= size + trailer;

  648.         }

  649.     }

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

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

  652.         return AVERROR_INVALIDDATA;

  653.     }

  654. 

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

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

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

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

  659. 

  660.         fs->slice_damaged = 0;

  661. 

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

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

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

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

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

  667. 

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

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

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

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

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

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

  674.                 return AVERROR_INVALIDDATA;

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

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

  677.                 return AVERROR_INVALIDDATA;

  678.         }

  679. 

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

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

  682. 

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

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

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

  686.                     av_log(f->avctx, AV_LOG_ERROR,

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

  688.                     return AVERROR_INVALIDDATA;

  689.                 }

  690.                 p->quant_table_index = idx;

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

  692.                        sizeof(p->quant_table));

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

  694.             } else {

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

  696.             }

  697. 

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

  699.                 av_assert0(context_count >= 0);

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

  701.                     av_freep(&p->state);

  702.                     av_freep(&p->vlc_state);

  703.                 }

  704.                 p->context_count = context_count;

  705.             }

  706.         }

  707.     }

  708.     return 0;

  709. }

  710. 

  711. static av_cold int decode_init(AVCodecContext *avctx)

  712. {

  713.     FFV1Context *f = avctx->priv_data;

  714.     int ret;

  715. 

  716.     if ((ret = ffv1_common_init(avctx)) < 0)

  717.         return ret;

  718. 

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

  720.         return ret;

  721. 

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

  723.         return ret;

  724. 

  725.     return 0;

  726. }

  727. 

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

  729. {

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

  731.     int buf_size        = avpkt->size;

  732.     FFV1Context *f      = avctx->priv_data;

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

  734.     int i, ret;

  735.     uint8_t keystate = 128;

  736.     const uint8_t *buf_p;

  737.     AVFrame *const p    = data;

  738. 

  739.     f->cur = p;

  740. 

  741.     ff_init_range_decoder(c, buf, buf_size);

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

  743. 

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

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

  746.         p->key_frame    = 1;

  747.         f->key_frame_ok = 0;

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

  749.             return ret;

  750.         f->key_frame_ok = 1;

  751.     } else {

  752.         if (!f->key_frame_ok) {

  753.             av_log(avctx, AV_LOG_ERROR,

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

  755.             return AVERROR_INVALIDDATA;

  756.         }

  757.         p->key_frame = 0;

  758.     }

  759. 

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

  761.         return ret;

  762. 

  763.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  766. 

  767.     buf_p = buf + buf_size;

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

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

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

  771.         int v;

  772. 

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

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

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

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

  777.             return AVERROR_INVALIDDATA;

  778.         }

  779.         buf_p -= v;

  780. 

  781.         if (f->ec) {

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

  783.             if (crc) {

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

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

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

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

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

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

  790.                 } else {

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

  792.                 }

  793.                 fs->slice_damaged = 1;

  794.             }

  795.         }

  796. 

  797.         if (i) {

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

  799.         } else

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

  801. 

  802.         fs->cur = p;

  803.     }

  804. 

  805.     avctx->execute(avctx,

  806.                    decode_slice,

  807.                    &f->slice_context[0],

  808.                    NULL,

  809.                    f->slice_count,

  810.                    sizeof(void*));

  811. 

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

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

  814.         int j;

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

  816.             const uint8_t *src[4];

  817.             uint8_t *dst[4];

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

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

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

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

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

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

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

  825.             }

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

  827.                           f->last_picture.linesize,

  828.                           avctx->pix_fmt,

  829.                           fs->slice_width,

  830.                           fs->slice_height);

  831.         }

  832.     }

  833. 

  834.     f->picture_number++;

  835. 

  836.     av_frame_unref(&f->last_picture);

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

  838.         return ret;

  839.     f->cur = NULL;

  840. 

  841.     *got_frame = 1;

  842. 

  843.     return buf_size;

  844. }

  845. 

  846. AVCodec ff_ffv1_decoder = {

  847.     .name           = "ffv1",

  848.     .type           = AVMEDIA_TYPE_VIDEO,

  849.     .id             = AV_CODEC_ID_FFV1,

  850.     .priv_data_size = sizeof(FFV1Context),

  851.     .init           = decode_init,

  852.     .close          = ffv1_close,

  853.     .decode         = decode_frame,

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

  855.                       CODEC_CAP_SLICE_THREADS,

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

  857. };