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

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

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

  83. 

  84. #if 0 // JPEG LS

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

  86.         v ^= (-1);

  87. #else

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

  89. #endif

  90. 

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

  92. 

  93.     update_vlc_state(state, v);

  94. 

  95.     return ret;

  96. }

  97. 

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

  99.                                          int16_t *sample[2],

  100.                                          int plane_index, int bits)

  101. {

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

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

  104.     int x;

  105.     int run_count = 0;

  106.     int run_mode  = 0;

  107.     int run_index = s->run_index;

  108. 

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

  110.         int diff, context, sign;

  111. 

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

  113.         if (context < 0) {

  114.             context = -context;

  115.             sign    = 1;

  116.         } else

  117.             sign = 0;

  118. 

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

  120. 

  121.         if (s->ac) {

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

  123.         } else {

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

  125.                 run_mode = 1;

  126. 

  127.             if (run_mode) {

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

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

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

  131.                         if (x + run_count <= w)

  132.                             run_index++;

  133.                     } else {

  134.                         if (ff_log2_run[run_index])

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

  136.                         else

  137.                             run_count = 0;

  138.                         if (run_index)

  139.                             run_index--;

  140.                         run_mode = 2;

  141.                     }

  142.                 }

  143.                 run_count--;

  144.                 if (run_count < 0) {

  145.                     run_mode  = 0;

  146.                     run_count = 0;

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

  148.                                                bits);

  149.                     if (diff >= 0)

  150.                         diff++;

  151.                 } else

  152.                     diff = 0;

  153.             } else

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

  155. 

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

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

  158.         }

  159. 

  160.         if (sign)

  161.             diff = -diff;

  162. 

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

  164.                        ((1 << bits) - 1);

  165.     }

  166.     s->run_index = run_index;

  167. }

  168. 

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

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

  171. {

  172.     int x, y;

  173.     int16_t *sample[2];

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

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

  176. 

  177.     s->run_index = 0;

  178. 

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

  180. 

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

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

  183. 

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

  185.         sample[1] = temp;

  186. 

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

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

  189. 

  190. // { START_TIMER

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

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

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

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

  195.         } else {

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

  197.             if (s->packed_at_lsb) {

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

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

  200.                 }

  201.             } else {

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

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

  204.                 }

  205.             }

  206.         }

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

  208.     }

  209. }

  210. 

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

  212. {

  213.     int x, y, p;

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

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

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

  217.     int offset = 1 << bits;

  218. 

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

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

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

  222.     }

  223. 

  224.     s->run_index = 0;

  225. 

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

  227. 

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

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

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

  231. 

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

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

  234. 

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

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

  237.             if (lbd)

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

  239.             else

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

  241.         }

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

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

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

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

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

  247. 

  248.             b -= offset;

  249.             r -= offset;

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

  251.             b += g;

  252.             r += g;

  253. 

  254.             if (lbd)

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

  256.             else {

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

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

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

  260.             }

  261.         }

  262.     }

  263. }

  264. 

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

  266. {

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

  268.     uint8_t state[CONTEXT_SIZE];

  269.     unsigned ps, i, context_count;

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

  271. 

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

  273. 

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

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

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

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

  278. 

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

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

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

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

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

  284.         return -1;

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

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

  287.         return -1;

  288. 

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

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

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

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

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

  294.             return -1;

  295.         }

  296.         p->quant_table_index = idx;

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

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

  299. 

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

  301.             av_freep(&p->state);

  302.             av_freep(&p->vlc_state);

  303.         }

  304.         p->context_count = context_count;

  305.     }

  306. 

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

  308.     if (ps == 1) {

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

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

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

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

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

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

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

  316.     }

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

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

  319. 

  320.     return 0;

  321. }

  322. 

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

  324. {

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

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

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

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

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

  330. 

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

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

  333.             return AVERROR(ENOMEM);

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

  335.             fs->slice_damaged = 1;

  336.             return AVERROR_INVALIDDATA;

  337.         }

  338.     }

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

  340.         return ret;

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

  342.         ffv1_clear_slice_state(f, fs);

  343. 

  344.     width  = fs->slice_width;

  345.     height = fs->slice_height;

  346.     x      = fs->slice_x;

  347.     y      = fs->slice_y;

  348. 

  349.     if (!fs->ac) {

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

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

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

  353.         init_get_bits(&fs->gb,

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

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

  356.     }

  357. 

  358.     av_assert1(width && height);

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

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

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

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

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

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

  365. 

  366.         if (f->chroma_planes) {

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

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

  369.         }

  370.         if (fs->transparency)

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

  372.     } else {

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

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

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

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

  377.     }

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

  379.         int v;

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

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

  382.         if (v) {

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

  384.             fs->slice_damaged = 1;

  385.         }

  386.     }

  387. 

  388.     emms_c();

  389. 

  390.     return 0;

  391. }

  392. 

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

  394. {

  395.     int v;

  396.     int i = 0;

  397.     uint8_t state[CONTEXT_SIZE];

  398. 

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

  400. 

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

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

  403. 

  404.         if (len > 128 - i)

  405.             return AVERROR_INVALIDDATA;

  406. 

  407.         while (len--) {

  408.             quant_table[i] = scale * v;

  409.             i++;

  410.         }

  411.     }

  412. 

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

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

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

  416. 

  417.     return 2 * v - 1;

  418. }

  419. 

  420. static int read_quant_tables(RangeCoder *c,

  421.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  422. {

  423.     int i;

  424.     int context_count = 1;

  425. 

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

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

  428.         if (context_count > 32768U) {

  429.             return AVERROR_INVALIDDATA;

  430.         }

  431.     }

  432.     return (context_count + 1) / 2;

  433. }

  434. 

  435. static int read_extra_header(FFV1Context *f)

  436. {

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

  438.     uint8_t state[CONTEXT_SIZE];

  439.     int i, j, k, ret;

  440.     uint8_t state2[32][CONTEXT_SIZE];

  441. 

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

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

  444. 

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

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

  447. 

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

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

  450.         c->bytestream_end -= 4;

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

  452.     }

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

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

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

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

  457.     }

  458. 

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

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

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

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

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

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

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

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

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

  468. 

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

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

  471.        ) {

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

  473.         return AVERROR_INVALIDDATA;

  474.     }

  475. 

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

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

  478.         return AVERROR_INVALIDDATA;

  479. 

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

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

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

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

  484.             return AVERROR_INVALIDDATA;

  485.         }

  486.     }

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

  488.         return ret;

  489. 

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

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

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

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

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

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

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

  497.                 }

  498.         }

  499. 

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

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

  502.     }

  503. 

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

  505.         unsigned v;

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

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

  508.         if (v) {

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

  510.             return AVERROR_INVALIDDATA;

  511.         }

  512.     }

  513. 

  514.     return 0;

  515. }

  516. 

  517. static int read_header(FFV1Context *f)

  518. {

  519.     uint8_t state[CONTEXT_SIZE];

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

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

  522. 

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

  524. 

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

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

  527.         if (v >= 2) {

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

  529.             return AVERROR_INVALIDDATA;

  530.         }

  531.         f->version = v;

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

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

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

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

  536.         }

  537. 

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

  539. 

  540.         if (f->version > 0)

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

  542. 

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

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

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

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

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

  548.     }

  549. 

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

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

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

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

  554.             else

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

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

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

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

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

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

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

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

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

  564.             default:

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

  566.                 return AVERROR(ENOSYS);

  567.             }

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

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

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

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

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

  573.             default:

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

  575.                 return AVERROR(ENOSYS);

  576.             }

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

  578.             f->packed_at_lsb = 1;

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

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

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

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

  583.             default:

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

  585.                 return AVERROR(ENOSYS);

  586.             }

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

  588.             f->packed_at_lsb = 1;

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

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

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

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

  593.             default:

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

  595.                 return AVERROR(ENOSYS);

  596.             }

  597.         } else {

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

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

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

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

  602.             default:

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

  604.                 return AVERROR(ENOSYS);

  605.             }

  606.         }

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

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

  609.             av_log(f->avctx, AV_LOG_ERROR,

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

  611.             return AVERROR(ENOSYS);

  612.         }

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

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

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

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

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

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

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

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

  621.         else

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

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

  624.     } else {

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

  626.         return AVERROR(ENOSYS);

  627.     }

  628. 

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

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

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

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

  633.         if (context_count < 0) {

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

  635.             return AVERROR_INVALIDDATA;

  636.         }

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

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

  639.     } else {

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

  641.         for (f->slice_count = 0;

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

  643.              f->slice_count++) {

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

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

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

  647.                 break;

  648.             p -= size + trailer;

  649.         }

  650.     }

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

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

  653.         return AVERROR_INVALIDDATA;

  654.     }

  655. 

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

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

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

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

  660. 

  661.         fs->slice_damaged = 0;

  662. 

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

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

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

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

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

  668. 

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

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

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

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

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

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

  675.                 return AVERROR_INVALIDDATA;

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

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

  678.                 return AVERROR_INVALIDDATA;

  679.         }

  680. 

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

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

  683. 

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

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

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

  687.                     av_log(f->avctx, AV_LOG_ERROR,

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

  689.                     return AVERROR_INVALIDDATA;

  690.                 }

  691.                 p->quant_table_index = idx;

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

  693.                        sizeof(p->quant_table));

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

  695.             } else {

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

  697.             }

  698. 

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

  700.                 av_assert0(context_count >= 0);

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

  702.                     av_freep(&p->state);

  703.                     av_freep(&p->vlc_state);

  704.                 }

  705.                 p->context_count = context_count;

  706.             }

  707.         }

  708.     }

  709.     return 0;

  710. }

  711. 

  712. static av_cold int decode_init(AVCodecContext *avctx)

  713. {

  714.     FFV1Context *f = avctx->priv_data;

  715.     int ret;

  716. 

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

  718.         return ret;

  719. 

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

  721.         return ret;

  722. 

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

  724.         return ret;

  725. 

  726.     return 0;

  727. }

  728. 

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

  730. {

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

  732.     int buf_size        = avpkt->size;

  733.     FFV1Context *f      = avctx->priv_data;

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

  735.     int i, ret;

  736.     uint8_t keystate = 128;

  737.     const uint8_t *buf_p;

  738.     AVFrame *const p    = data;

  739. 

  740.     f->cur = p;

  741. 

  742.     ff_init_range_decoder(c, buf, buf_size);

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

  744. 

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

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

  747.         p->key_frame    = 1;

  748.         f->key_frame_ok = 0;

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

  750.             return ret;

  751.         f->key_frame_ok = 1;

  752.     } else {

  753.         if (!f->key_frame_ok) {

  754.             av_log(avctx, AV_LOG_ERROR,

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

  756.             return AVERROR_INVALIDDATA;

  757.         }

  758.         p->key_frame = 0;

  759.     }

  760. 

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

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

  763.         return ret;

  764.     }

  765. 

  766.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  769. 

  770.     buf_p = buf + buf_size;

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

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

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

  774.         int v;

  775. 

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

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

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

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

  780.             return AVERROR_INVALIDDATA;

  781.         }

  782.         buf_p -= v;

  783. 

  784.         if (f->ec) {

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

  786.             if (crc) {

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

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

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

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

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

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

  793.                 } else {

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

  795.                 }

  796.                 fs->slice_damaged = 1;

  797.             }

  798.         }

  799. 

  800.         if (i) {

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

  802.         } else

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

  804. 

  805.         fs->cur = p;

  806.     }

  807. 

  808.     avctx->execute(avctx,

  809.                    decode_slice,

  810.                    &f->slice_context[0],

  811.                    NULL,

  812.                    f->slice_count,

  813.                    sizeof(void*));

  814. 

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

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

  817.         int j;

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

  819.             const uint8_t *src[4];

  820.             uint8_t *dst[4];

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

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

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

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

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

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

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

  828.             }

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

  830.                           f->last_picture.linesize,

  831.                           avctx->pix_fmt,

  832.                           fs->slice_width,

  833.                           fs->slice_height);

  834.         }

  835.     }

  836. 

  837.     f->picture_number++;

  838. 

  839.     av_frame_unref(&f->last_picture);

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

  841.         return ret;

  842.     f->cur = NULL;

  843. 

  844.     *got_frame = 1;

  845. 

  846.     return buf_size;

  847. }

  848. 

  849. AVCodec ff_ffv1_decoder = {

  850.     .name           = "ffv1",

  851.     .type           = AVMEDIA_TYPE_VIDEO,

  852.     .id             = AV_CODEC_ID_FFV1,

  853.     .priv_data_size = sizeof(FFV1Context),

  854.     .init           = decode_init,

  855.     .close          = ffv1_close,

  856.     .decode         = decode_frame,

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

  858.                       CODEC_CAP_SLICE_THREADS,

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

  860. };