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

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

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

  84. 

  85. #if 0 // JPEG LS

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

  87.         v ^= (-1);

  88. #else

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

  90. #endif

  91. 

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

  93. 

  94.     update_vlc_state(state, v);

  95. 

  96.     return ret;

  97. }

  98. 

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

  100.                                          int16_t *sample[2],

  101.                                          int plane_index, int bits)

  102. {

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

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

  105.     int x;

  106.     int run_count = 0;

  107.     int run_mode  = 0;

  108.     int run_index = s->run_index;

  109. 

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

  111.         int diff, context, sign;

  112. 

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

  114.         if (context < 0) {

  115.             context = -context;

  116.             sign    = 1;

  117.         } else

  118.             sign = 0;

  119. 

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

  121. 

  122.         if (s->ac) {

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

  124.         } else {

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

  126.                 run_mode = 1;

  127. 

  128.             if (run_mode) {

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

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

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

  132.                         if (x + run_count <= w)

  133.                             run_index++;

  134.                     } else {

  135.                         if (ff_log2_run[run_index])

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

  137.                         else

  138.                             run_count = 0;

  139.                         if (run_index)

  140.                             run_index--;

  141.                         run_mode = 2;

  142.                     }

  143.                 }

  144.                 run_count--;

  145.                 if (run_count < 0) {

  146.                     run_mode  = 0;

  147.                     run_count = 0;

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

  149.                                                bits);

  150.                     if (diff >= 0)

  151.                         diff++;

  152.                 } else

  153.                     diff = 0;

  154.             } else

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

  156. 

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

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

  159.         }

  160. 

  161.         if (sign)

  162.             diff = -diff;

  163. 

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

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

  166.     }

  167.     s->run_index = run_index;

  168. }

  169. 

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

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

  172. {

  173.     int x, y;

  174.     int16_t *sample[2];

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

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

  177. 

  178.     s->run_index = 0;

  179. 

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

  181. 

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

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

  184. 

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

  186.         sample[1] = temp;

  187. 

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

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

  190. 

  191. // { START_TIMER

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

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

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

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

  196.         } else {

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

  198.             if (s->packed_at_lsb) {

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

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

  201.                 }

  202.             } else {

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

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

  205.                 }

  206.             }

  207.         }

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

  209.     }

  210. }

  211. 

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

  213. {

  214.     int x, y, p;

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

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

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

  218.     int offset = 1 << bits;

  219. 

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

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

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

  223.     }

  224. 

  225.     s->run_index = 0;

  226. 

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

  228. 

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

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

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

  232. 

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

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

  235. 

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

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

  238.             if (lbd)

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

  240.             else

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

  242.         }

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

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

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

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

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

  248. 

  249.             b -= offset;

  250.             r -= offset;

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

  252.             b += g;

  253.             r += g;

  254. 

  255.             if (lbd)

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

  257.             else {

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

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

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

  261.             }

  262.         }

  263.     }

  264. }

  265. 

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

  267. {

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

  269.     uint8_t state[CONTEXT_SIZE];

  270.     unsigned ps, i, context_count;

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

  272. 

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

  274. 

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

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

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

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

  279. 

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

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

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

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

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

  285.         return -1;

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

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

  288.         return -1;

  289. 

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

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

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

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

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

  295.             return -1;

  296.         }

  297.         p->quant_table_index = idx;

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

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

  300. 

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

  302.             av_freep(&p->state);

  303.             av_freep(&p->vlc_state);

  304.         }

  305.         p->context_count = context_count;

  306.     }

  307. 

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

  309.     if (ps == 1) {

  310.         f->picture.interlaced_frame = 1;

  311.         f->picture.top_field_first  = 1;

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

  313.         f->picture.interlaced_frame = 1;

  314.         f->picture.top_field_first  = 0;

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

  316.         f->picture.interlaced_frame = 0;

  317.     }

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

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

  320. 

  321.     return 0;

  322. }

  323. 

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

  325. {

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

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

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

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

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

  331. 

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

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

  334.             return AVERROR(ENOMEM);

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

  336.             fs->slice_damaged = 1;

  337.             return AVERROR_INVALIDDATA;

  338.         }

  339.     }

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

  341.         return ret;

  342.     if (f->picture.key_frame)

  343.         ffv1_clear_slice_state(f, fs);

  344. 

  345.     width  = fs->slice_width;

  346.     height = fs->slice_height;

  347.     x      = fs->slice_x;

  348.     y      = fs->slice_y;

  349. 

  350.     if (!fs->ac) {

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

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

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

  354.         init_get_bits(&fs->gb,

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

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

  357.     }

  358. 

  359.     av_assert1(width && height);

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

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

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

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

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

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

  366. 

  367.         if (f->chroma_planes) {

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

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

  370.         }

  371.         if (fs->transparency)

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

  373.     } else {

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

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

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

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

  378.     }

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

  380.         int v;

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

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

  383.         if (v) {

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

  385.             fs->slice_damaged = 1;

  386.         }

  387.     }

  388. 

  389.     emms_c();

  390. 

  391.     return 0;

  392. }

  393. 

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

  395. {

  396.     int v;

  397.     int i = 0;

  398.     uint8_t state[CONTEXT_SIZE];

  399. 

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

  401. 

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

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

  404. 

  405.         if (len > 128 - i)

  406.             return AVERROR_INVALIDDATA;

  407. 

  408.         while (len--) {

  409.             quant_table[i] = scale * v;

  410.             i++;

  411.         }

  412.     }

  413. 

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

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

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

  417. 

  418.     return 2 * v - 1;

  419. }

  420. 

  421. static int read_quant_tables(RangeCoder *c,

  422.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  423. {

  424.     int i;

  425.     int context_count = 1;

  426. 

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

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

  429.         if (context_count > 32768U) {

  430.             return AVERROR_INVALIDDATA;

  431.         }

  432.     }

  433.     return (context_count + 1) / 2;

  434. }

  435. 

  436. static int read_extra_header(FFV1Context *f)

  437. {

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

  439.     uint8_t state[CONTEXT_SIZE];

  440.     int i, j, k, ret;

  441.     uint8_t state2[32][CONTEXT_SIZE];

  442. 

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

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

  445. 

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

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

  448. 

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

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

  451.         c->bytestream_end -= 4;

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

  453.     }

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

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

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

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

  458.     }

  459. 

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

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

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

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

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

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

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

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

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

  469. 

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

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

  472.        ) {

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

  474.         return AVERROR_INVALIDDATA;

  475.     }

  476. 

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

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

  479.         return AVERROR_INVALIDDATA;

  480. 

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

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

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

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

  485.             return AVERROR_INVALIDDATA;

  486.         }

  487.     }

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

  489.         return ret;

  490. 

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

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

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

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

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

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

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

  498.                 }

  499.         }

  500. 

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

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

  503.     }

  504. 

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

  506.         unsigned v;

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

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

  509.         if (v) {

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

  511.             return AVERROR_INVALIDDATA;

  512.         }

  513.     }

  514. 

  515.     return 0;

  516. }

  517. 

  518. static int read_header(FFV1Context *f)

  519. {

  520.     uint8_t state[CONTEXT_SIZE];

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

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

  523. 

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

  525. 

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

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

  528.         if (v >= 2) {

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

  530.             return AVERROR_INVALIDDATA;

  531.         }

  532.         f->version = v;

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

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

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

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

  537.         }

  538. 

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

  540. 

  541.         if (f->version > 0)

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

  543. 

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

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

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

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

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

  549.     }

  550. 

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

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

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

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

  555.             else

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

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

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

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

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

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

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

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

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

  565.             default:

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

  567.                 return AVERROR(ENOSYS);

  568.             }

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

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

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

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

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

  574.             default:

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

  576.                 return AVERROR(ENOSYS);

  577.             }

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

  579.             f->packed_at_lsb = 1;

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

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

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

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

  584.             default:

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

  586.                 return AVERROR(ENOSYS);

  587.             }

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

  589.             f->packed_at_lsb = 1;

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

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

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

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

  594.             default:

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

  596.                 return AVERROR(ENOSYS);

  597.             }

  598.         } else {

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

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

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

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

  603.             default:

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

  605.                 return AVERROR(ENOSYS);

  606.             }

  607.         }

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

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

  610.             av_log(f->avctx, AV_LOG_ERROR,

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

  612.             return AVERROR(ENOSYS);

  613.         }

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

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

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

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

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

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

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

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

  622.         else

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

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

  625.     } else {

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

  627.         return AVERROR(ENOSYS);

  628.     }

  629. 

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

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

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

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

  634.         if (context_count < 0) {

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

  636.             return AVERROR_INVALIDDATA;

  637.         }

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

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

  640.     } else {

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

  642.         for (f->slice_count = 0;

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

  644.              f->slice_count++) {

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

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

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

  648.                 break;

  649.             p -= size + trailer;

  650.         }

  651.     }

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

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

  654.         return AVERROR_INVALIDDATA;

  655.     }

  656. 

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

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

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

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

  661. 

  662.         fs->slice_damaged = 0;

  663. 

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

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

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

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

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

  669. 

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

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

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

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

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

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

  676.                 return AVERROR_INVALIDDATA;

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

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

  679.                 return AVERROR_INVALIDDATA;

  680.         }

  681. 

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

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

  684. 

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

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

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

  688.                     av_log(f->avctx, AV_LOG_ERROR,

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

  690.                     return AVERROR_INVALIDDATA;

  691.                 }

  692.                 p->quant_table_index = idx;

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

  694.                        sizeof(p->quant_table));

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

  696.             } else {

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

  698.             }

  699. 

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

  701.                 av_assert0(context_count >= 0);

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

  703.                     av_freep(&p->state);

  704.                     av_freep(&p->vlc_state);

  705.                 }

  706.                 p->context_count = context_count;

  707.             }

  708.         }

  709.     }

  710.     return 0;

  711. }

  712. 

  713. static av_cold int decode_init(AVCodecContext *avctx)

  714. {

  715.     FFV1Context *f = avctx->priv_data;

  716.     int ret;

  717. 

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

  719.         return ret;

  720. 

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

  722.         return ret;

  723. 

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

  725.         return ret;

  726. 

  727.     return 0;

  728. }

  729. 

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

  731. {

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

  733.     int buf_size        = avpkt->size;

  734.     FFV1Context *f      = avctx->priv_data;

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

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

  737.     int i, ret;

  738.     uint8_t keystate = 128;

  739.     const uint8_t *buf_p;

  740. 

  741.     AVFrame *picture = data;

  742. 

  743.     /* release previously stored data */

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

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

  746. 

  747.     ff_init_range_decoder(c, buf, buf_size);

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

  749. 

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

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

  752.         p->key_frame    = 1;

  753.         f->key_frame_ok = 0;

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

  755.             return ret;

  756.         f->key_frame_ok = 1;

  757.     } else {

  758.         if (!f->key_frame_ok) {

  759.             av_log(avctx, AV_LOG_ERROR,

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

  761.             return AVERROR_INVALIDDATA;

  762.         }

  763.         p->key_frame = 0;

  764.     }

  765. 

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

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

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

  769.         return ret;

  770.     }

  771. 

  772.     if (avctx->debug & FF_DEBUG_PICT_INFO)

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

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

  775. 

  776.     buf_p = buf + buf_size;

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

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

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

  780.         int v;

  781. 

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

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

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

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

  786.             return AVERROR_INVALIDDATA;

  787.         }

  788.         buf_p -= v;

  789. 

  790.         if (f->ec) {

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

  792.             if (crc) {

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

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

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

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

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

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

  799.                 } else {

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

  801.                 }

  802.                 fs->slice_damaged = 1;

  803.             }

  804.         }

  805. 

  806.         if (i) {

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

  808.         } else

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

  810.     }

  811. 

  812.     avctx->execute(avctx,

  813.                    decode_slice,

  814.                    &f->slice_context[0],

  815.                    NULL,

  816.                    f->slice_count,

  817.                    sizeof(void*));

  818. 

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

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

  821.         int j;

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

  823.             const uint8_t *src[4];

  824.             uint8_t *dst[4];

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

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

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

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

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

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

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

  832.             }

  833.             av_image_copy(dst,

  834.                           f->picture.linesize,

  835.                           (const uint8_t **)src,

  836.                           f->last_picture.linesize,

  837.                           avctx->pix_fmt,

  838.                           fs->slice_width,

  839.                           fs->slice_height);

  840.         }

  841.     }

  842. 

  843.     f->picture_number++;

  844. 

  845.     *picture   = *p;

  846.     *got_frame = 1;

  847. 

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

  849. 

  850.     return buf_size;

  851. }

  852. 

  853. AVCodec ff_ffv1_decoder = {

  854.     .name           = "ffv1",

  855.     .type           = AVMEDIA_TYPE_VIDEO,

  856.     .id             = AV_CODEC_ID_FFV1,

  857.     .priv_data_size = sizeof(FFV1Context),

  858.     .init           = decode_init,

  859.     .close          = ffv1_close,

  860.     .decode         = decode_frame,

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

  862.                       CODEC_CAP_SLICE_THREADS,

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

  864. };