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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 "put_bits.h"

  38. #include "dsputil.h"

  39. #include "rangecoder.h"

  40. #include "golomb.h"

  41. #include "mathops.h"

  42. #include "ffv1.h"

  43. 

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

  45.                                                int is_signed)

  46. {

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

  48.         return 0;

  49.     else {

  50.         int i, e, a;

  51.         e = 0;

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

  53.             e++;

  54. 

  55.         a = 1;

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

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

  58. 

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

  60.         return (a ^ e) - e;

  61.     }

  62. }

  63. 

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

  65. {

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

  67. }

  68. 

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

  70.                                  int bits)

  71. {

  72.     int k, i, v, ret;

  73. 

  74.     i = state->count;

  75.     k = 0;

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

  77.         k++;

  78.         i += i;

  79.     }

  80. 

  81.     assert(k <= 8);

  82. 

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

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

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

  86. 

  87. #if 0 // JPEG LS

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

  89.         v ^= (-1);

  90. #else

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

  92. #endif

  93. 

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

  95. 

  96.     update_vlc_state(state, v);

  97. 

  98.     return ret;

  99. }

  100. 

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

  102.                                          int16_t *sample[2],

  103.                                          int plane_index, int bits)

  104. {

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

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

  107.     int x;

  108.     int run_count = 0;

  109.     int run_mode  = 0;

  110.     int run_index = s->run_index;

  111. 

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

  113.         int diff, context, sign;

  114. 

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

  116.         if (context < 0) {

  117.             context = -context;

  118.             sign    = 1;

  119.         } else

  120.             sign = 0;

  121. 

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

  123. 

  124.         if (s->ac) {

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

  126.         } else {

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

  128.                 run_mode = 1;

  129. 

  130.             if (run_mode) {

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

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

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

  134.                         if (x + run_count <= w)

  135.                             run_index++;

  136.                     } else {

  137.                         if (ff_log2_run[run_index])

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

  139.                         else

  140.                             run_count = 0;

  141.                         if (run_index)

  142.                             run_index--;

  143.                         run_mode = 2;

  144.                     }

  145.                 }

  146.                 run_count--;

  147.                 if (run_count < 0) {

  148.                     run_mode  = 0;

  149.                     run_count = 0;

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

  151.                                                bits);

  152.                     if (diff >= 0)

  153.                         diff++;

  154.                 } else

  155.                     diff = 0;

  156.             } else

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

  158. 

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

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

  161.         }

  162. 

  163.         if (sign)

  164.             diff = -diff;

  165. 

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

  167.                        ((1 << bits) - 1);

  168.     }

  169.     s->run_index = run_index;

  170. }

  171. 

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

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

  174. {

  175.     int x, y;

  176.     int16_t *sample[2];

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

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

  179. 

  180.     s->run_index = 0;

  181. 

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

  183. 

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

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

  186. 

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

  188.         sample[1] = temp;

  189. 

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

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

  192. 

  193. // { START_TIMER

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

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

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

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

  198.         } else {

  199.             decode_line(s, w, sample, plane_index, 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.                 }

  204.             } else {

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

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

  207.                 }

  208.             }

  209.         }

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

  211.     }

  212. }

  213. 

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

  215. {

  216.     int x, y, p;

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

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

  219.     int bits   = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 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 + (g<<8) + (r<<16) + (a<<24);

  259.             else {

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

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

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

  263.             }

  264.         }

  265.     }

  266. }

  267. 

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

  269. {

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

  271.     uint8_t state[CONTEXT_SIZE];

  272.     unsigned ps, i, context_count;

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

  274. 

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

  276. 

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

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

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

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

  281. 

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

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

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

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

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

  287.         return -1;

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

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

  290.         return -1;

  291. 

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

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

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

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

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

  297.             return -1;

  298.         }

  299.         p->quant_table_index = idx;

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

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

  302. 

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

  304.             av_freep(&p->state);

  305.             av_freep(&p->vlc_state);

  306.         }

  307.         p->context_count = context_count;

  308.     }

  309. 

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

  311.     if (ps == 1) {

  312.         f->picture.interlaced_frame = 1;

  313.         f->picture.top_field_first  = 1;

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

  315.         f->picture.interlaced_frame = 1;

  316.         f->picture.top_field_first  = 0;

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

  318.         f->picture.interlaced_frame = 0;

  319.     }

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

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

  322. 

  323.     return 0;

  324. }

  325. 

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

  327. {

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

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

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

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

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

  333. 

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

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

  336.             return AVERROR(ENOMEM);

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

  338.             fs->slice_damaged = 1;

  339.             return AVERROR_INVALIDDATA;

  340.         }

  341.     }

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

  343.         return ret;

  344.     if (f->picture.key_frame)

  345.         ffv1_clear_slice_state(f, fs);

  346. 

  347.     width  = fs->slice_width;

  348.     height = fs->slice_height;

  349.     x      = fs->slice_x;

  350.     y      = fs->slice_y;

  351. 

  352.     if (!fs->ac) {

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

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

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

  356.         init_get_bits(&fs->gb,

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

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

  359.     }

  360. 

  361.     av_assert1(width && height);

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

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

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

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

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

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

  368. 

  369.         if (f->chroma_planes) {

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

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

  372.         }

  373.         if (fs->transparency)

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

  375.     } else {

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

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

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

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

  380.     }

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

  382.         int v;

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

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

  385.         if (v) {

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

  387.             fs->slice_damaged = 1;

  388.         }

  389.     }

  390. 

  391.     emms_c();

  392. 

  393.     return 0;

  394. }

  395. 

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

  397. {

  398.     int v;

  399.     int i = 0;

  400.     uint8_t state[CONTEXT_SIZE];

  401. 

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

  403. 

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

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

  406. 

  407.         if (len > 128 - i)

  408.             return AVERROR_INVALIDDATA;

  409. 

  410.         while (len--) {

  411.             quant_table[i] = scale * v;

  412.             i++;

  413.         }

  414.     }

  415. 

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

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

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

  419. 

  420.     return 2 * v - 1;

  421. }

  422. 

  423. static int read_quant_tables(RangeCoder *c,

  424.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  425. {

  426.     int i;

  427.     int context_count = 1;

  428. 

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

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

  431.         if (context_count > 32768U) {

  432.             return AVERROR_INVALIDDATA;

  433.         }

  434.     }

  435.     return (context_count + 1) / 2;

  436. }

  437. 

  438. static int read_extra_header(FFV1Context *f)

  439. {

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

  441.     uint8_t state[CONTEXT_SIZE];

  442.     int i, j, k, ret;

  443.     uint8_t state2[32][CONTEXT_SIZE];

  444. 

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

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

  447. 

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

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

  450. 

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

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

  453.         c->bytestream_end -= 4;

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

  455.     }

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

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

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

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

  460.     }

  461. 

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

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

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

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

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

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

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

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

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

  471. 

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

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

  474.        ) {

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

  476.         return AVERROR_INVALIDDATA;

  477.     }

  478. 

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

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

  481.         return AVERROR_INVALIDDATA;

  482. 

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

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

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

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

  487.             return AVERROR_INVALIDDATA;

  488.         }

  489.     }

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

  491.         return ret;

  492. 

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

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

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

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

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

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

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

  500.                 }

  501.         }

  502. 

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

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

  505.     }

  506. 

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

  508.         unsigned v;

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

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

  511.         if (v) {

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

  513.             return AVERROR_INVALIDDATA;

  514.         }

  515.     }

  516. 

  517.     return 0;

  518. }

  519. 

  520. static int read_header(FFV1Context *f)

  521. {

  522.     uint8_t state[CONTEXT_SIZE];

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

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

  525. 

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

  527. 

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

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

  530.         if (v >= 2) {

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

  532.             return AVERROR_INVALIDDATA;

  533.         }

  534.         f->version = v;

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

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

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

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

  539.         }

  540. 

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

  542. 

  543.         if (f->version > 0)

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

  545. 

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

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

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

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

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

  551.     }

  552. 

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

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

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

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

  557.             else

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

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

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

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

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

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

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

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

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

  567.             default:

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

  569.                 return AVERROR(ENOSYS);

  570.             }

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

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

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

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

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

  576.             default:

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

  578.                 return AVERROR(ENOSYS);

  579.             }

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

  581.             f->packed_at_lsb = 1;

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

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

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

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

  586.             default:

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

  588.                 return AVERROR(ENOSYS);

  589.             }

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

  591.             f->packed_at_lsb = 1;

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

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

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

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

  596.             default:

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

  598.                 return AVERROR(ENOSYS);

  599.             }

  600.         } else {

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

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

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

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

  605.             default:

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

  607.                 return AVERROR(ENOSYS);

  608.             }

  609.         }

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

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

  612.             av_log(f->avctx, AV_LOG_ERROR,

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

  614.             return AVERROR(ENOSYS);

  615.         }

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

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

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

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

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

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

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

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

  624.         else

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

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

  627.     } else {

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

  629.         return AVERROR(ENOSYS);

  630.     }

  631. 

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

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

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

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

  636.         if (context_count < 0) {

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

  638.             return AVERROR_INVALIDDATA;

  639.         }

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

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

  642.     } else {

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

  644.         for (f->slice_count = 0;

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

  646.              f->slice_count++) {

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

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

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

  650.                 break;

  651.             p -= size + trailer;

  652.         }

  653.     }

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

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

  656.         return AVERROR_INVALIDDATA;

  657.     }

  658. 

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

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

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

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

  663. 

  664.         fs->slice_damaged = 0;

  665. 

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

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

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

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

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

  671. 

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

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

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

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

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

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

  678.                 return AVERROR_INVALIDDATA;

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

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

  681.                 return AVERROR_INVALIDDATA;

  682.         }

  683. 

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

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

  686. 

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

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

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

  690.                     av_log(f->avctx, AV_LOG_ERROR,

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

  692.                     return AVERROR_INVALIDDATA;

  693.                 }

  694.                 p->quant_table_index = idx;

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

  696.                        sizeof(p->quant_table));

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

  698.             } else {

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

  700.             }

  701. 

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

  703.                 av_assert0(context_count >= 0);

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

  705.                     av_freep(&p->state);

  706.                     av_freep(&p->vlc_state);

  707.                 }

  708.                 p->context_count = context_count;

  709.             }

  710.         }

  711.     }

  712.     return 0;

  713. }

  714. 

  715. static av_cold int decode_init(AVCodecContext *avctx)

  716. {

  717.     FFV1Context *f = avctx->priv_data;

  718.     int ret;

  719. 

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

  721.         return ret;

  722. 

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

  724.         return ret;

  725. 

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

  727.         return ret;

  728. 

  729.     return 0;

  730. }

  731. 

  732. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

  733. {

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

  735.     int buf_size        = avpkt->size;

  736.     FFV1Context *f      = avctx->priv_data;

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

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

  739.     int i, ret;

  740.     uint8_t keystate = 128;

  741.     const uint8_t *buf_p;

  742. 

  743.     AVFrame *picture = data;

  744. 

  745.     /* release previously stored data */

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

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

  748. 

  749.     ff_init_range_decoder(c, buf, buf_size);

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

  751. 

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

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

  754.         p->key_frame    = 1;

  755.         f->key_frame_ok = 0;

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

  757.             return ret;

  758.         f->key_frame_ok = 1;

  759.     } else {

  760.         if (!f->key_frame_ok) {

  761.             av_log(avctx, AV_LOG_ERROR,

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

  763.             return AVERROR_INVALIDDATA;

  764.         }

  765.         p->key_frame = 0;

  766.     }

  767. 

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

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

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

  771.         return ret;

  772.     }

  773. 

  774.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  777. 

  778.     buf_p = buf + buf_size;

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

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

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

  782.         int v;

  783. 

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

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

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

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

  788.             return AVERROR_INVALIDDATA;

  789.         }

  790.         buf_p -= v;

  791. 

  792.         if (f->ec) {

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

  794.             if (crc) {

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

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

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

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

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

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

  801.                 } else {

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

  803.                 }

  804.                 fs->slice_damaged = 1;

  805.             }

  806.         }

  807. 

  808.         if (i) {

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

  810.         } else

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

  812.     }

  813. 

  814.     avctx->execute(avctx,

  815.                    decode_slice,

  816.                    &f->slice_context[0],

  817.                    NULL,

  818.                    f->slice_count,

  819.                    sizeof(void*));

  820. 

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

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

  823.         int j;

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

  825.             const uint8_t *src[4];

  826.             uint8_t *dst[4];

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

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

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

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

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

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

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

  834.             }

  835.             av_image_copy(dst,

  836.                           f->picture.linesize,

  837.                           (const uint8_t **)src,

  838.                           f->last_picture.linesize,

  839.                           avctx->pix_fmt,

  840.                           fs->slice_width,

  841.                           fs->slice_height);

  842.         }

  843.     }

  844. 

  845.     f->picture_number++;

  846. 

  847.     *picture   = *p;

  848.     *data_size = sizeof(AVFrame);

  849. 

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

  851. 

  852.     return buf_size;

  853. }

  854. 

  855. AVCodec ff_ffv1_decoder = {

  856.     .name           = "ffv1",

  857.     .type           = AVMEDIA_TYPE_VIDEO,

  858.     .id             = AV_CODEC_ID_FFV1,

  859.     .priv_data_size = sizeof(FFV1Context),

  860.     .init           = decode_init,

  861.     .close          = ffv1_close,

  862.     .decode         = decode_frame,

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

  864.                       CODEC_CAP_SLICE_THREADS,

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

  866. };