FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ffv1dec.c
Date: 2025-06-17 11:18:48
Exec Total Coverage
Lines: 312 550 56.7%
Functions: 13 17 76.5%
Branches: 181 412 43.9%
Line Branch Exec Source
1 /*
2 * FFV1 decoder
3 *
4 * Copyright (c) 2003-2013 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/mem.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/pixdesc.h"
33 #include "avcodec.h"
34 #include "codec_internal.h"
35 #include "get_bits.h"
36 #include "rangecoder.h"
37 #include "golomb.h"
38 #include "mathops.h"
39 #include "ffv1.h"
40 #include "progressframe.h"
41 #include "libavutil/refstruct.h"
42 #include "thread.h"
43 #include "decode.h"
44 #include "hwconfig.h"
45 #include "hwaccel_internal.h"
46 #include "config_components.h"
47
48 163659991 static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
49 int bits)
50 {
51 int k, i, v, ret;
52
53 163659991 i = state->count;
54 163659991 k = 0;
55
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 436192165 while (i < state->error_sum) { // FIXME: optimize
56 272532174 k++;
57 272532174 i += i;
58 }
59
60 163659991 v = get_sr_golomb(gb, k, 12, bits);
61 ff_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",
62 v, state->bias, state->error_sum, state->drift, state->count, k);
63
64 163659991 v ^= ((2 * state->drift + state->count) >> 31);
65
66 163659991 ret = fold(v + state->bias, bits);
67
68 163659991 update_vlc_state(state, v);
69
70 163659991 return ret;
71 }
72
73 4542400 static int is_input_end(RangeCoder *c, GetBitContext *gb, int ac)
74 {
75
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 4542400 if (ac != AC_GOLOMB_RICE) {
76
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 2514800 if (c->overread > MAX_OVERREAD)
77 ✗ return AVERROR_INVALIDDATA;
78 } else {
79
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 2027600 if (get_bits_left(gb) < 1)
80 ✗ return AVERROR_INVALIDDATA;
81 }
82 4542400 return 0;
83 }
84
85 #define TYPE int16_t
86 #define RENAME(name) name
87 #include "ffv1dec_template.c"
88 #undef TYPE
89 #undef RENAME
90
91 #define TYPE int32_t
92 #define RENAME(name) name ## 32
93 #include "ffv1dec_template.c"
94
95 18300 static int decode_plane(FFV1Context *f, FFV1SliceContext *sc,
96 GetBitContext *gb,
97 uint8_t *src, int w, int h, int stride, int plane_index,
98 int remap_index, int pixel_stride, int ac)
99 {
100 int x, y;
101 int16_t *sample[2];
102 int bits;
103 unsigned mask;
104
105
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 18300 if (sc->remap) {
106 ✗ bits = av_ceil_log2(sc->remap_count[remap_index]);
107 ✗ mask = (1<<bits)-1;
108 } else {
109 18300 bits = f->avctx->bits_per_raw_sample;
110 }
111
112 18300 sample[0] = sc->sample_buffer + 3;
113 18300 sample[1] = sc->sample_buffer + w + 6 + 3;
114
115 18300 sc->run_index = 0;
116
117 18300 memset(sc->sample_buffer, 0, 2 * (w + 6) * sizeof(*sc->sample_buffer));
118
119
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 1750700 for (y = 0; y < h; y++) {
120 1732400 int16_t *temp = sample[0]; // FIXME: try a normal buffer
121
122 1732400 sample[0] = sample[1];
123 1732400 sample[1] = temp;
124
125 1732400 sample[1][-1] = sample[0][0];
126 1732400 sample[0][w] = sample[0][w - 1];
127
128
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 1732400 if (f->avctx->bits_per_raw_sample <= 8) {
129 924200 int ret = decode_line(f, sc, gb, w, sample, plane_index, 8, ac);
130
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 924200 if (ret < 0)
131 ✗ return ret;
132
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 924200 if (sc->remap)
133 ✗ for (x = 0; x < w; x++)
134 ✗ sample[1][x] = sc->fltmap[remap_index][sample[1][x]];
135
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 146178100 for (x = 0; x < w; x++)
136 145253900 src[x*pixel_stride + stride * y] = sample[1][x];
137 } else {
138 808200 int ret = decode_line(f, sc, gb, w, sample, plane_index, bits, ac);
139
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 808200 if (ret < 0)
140 ✗ return ret;
141
142
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 808200 if (sc->remap) {
143 ✗ if (f->packed_at_lsb || f->avctx->bits_per_raw_sample == 16) {
144 ✗ for (x = 0; x < w; x++) {
145 ✗ ((uint16_t*)(src + stride*y))[x*pixel_stride] = sc->fltmap[remap_index][sample[1][x] & mask];
146 }
147 } else {
148 ✗ for (x = 0; x < w; x++) {
149 ✗ int v = sc->fltmap[remap_index][sample[1][x] & mask];
150 ✗ ((uint16_t*)(src + stride*y))[x*pixel_stride] = v << (16 - f->avctx->bits_per_raw_sample) | v >> (2 * f->avctx->bits_per_raw_sample - 16);
151 }
152 }
153 } else {
154
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 808200 if (f->packed_at_lsb || f->avctx->bits_per_raw_sample == 16) {
155
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 107664400 for (x = 0; x < w; x++) {
156 106856200 ((uint16_t*)(src + stride*y))[x*pixel_stride] = sample[1][x];
157 }
158 } else {
159 ✗ for (x = 0; x < w; x++) {
160 ✗ ((uint16_t*)(src + stride*y))[x*pixel_stride] = sample[1][x] << (16 - f->avctx->bits_per_raw_sample) | ((uint16_t **)sample)[1][x] >> (2 * f->avctx->bits_per_raw_sample - 16);
161 }
162 }
163 }
164 }
165 }
166 18300 return 0;
167 }
168
169 6700 static int decode_slice_header(const FFV1Context *f,
170 FFV1SliceContext *sc, AVFrame *frame)
171 {
172 6700 RangeCoder *c = &sc->c;
173 uint8_t state[CONTEXT_SIZE];
174 unsigned ps, context_count;
175 int sx, sy, sw, sh;
176
177 6700 memset(state, 128, sizeof(state));
178 6700 sx = ff_ffv1_get_symbol(c, state, 0);
179 6700 sy = ff_ffv1_get_symbol(c, state, 0);
180 6700 sw = ff_ffv1_get_symbol(c, state, 0) + 1U;
181 6700 sh = ff_ffv1_get_symbol(c, state, 0) + 1U;
182
183
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 6700 av_assert0(f->version > 2);
184
185
186
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 6700 if (sx < 0 || sy < 0 || sw <= 0 || sh <= 0)
187 ✗ return AVERROR_INVALIDDATA;
188
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 6700 if (sx > f->num_h_slices - sw || sy > f->num_v_slices - sh)
189 ✗ return AVERROR_INVALIDDATA;
190
191 6700 sc->slice_x = ff_slice_coord(f, f->width , sx , f->num_h_slices, f->chroma_h_shift);
192 6700 sc->slice_y = ff_slice_coord(f, f->height, sy , f->num_v_slices, f->chroma_v_shift);
193 6700 sc->slice_width = ff_slice_coord(f, f->width , sx + sw, f->num_h_slices, f->chroma_h_shift) - sc->slice_x;
194 6700 sc->slice_height = ff_slice_coord(f, f->height, sy + sh, f->num_v_slices, f->chroma_v_shift) - sc->slice_y;
195
196
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 6700 av_assert0((unsigned)sc->slice_width <= f->width &&
197 (unsigned)sc->slice_height <= f->height);
198
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 6700 av_assert0 ( (unsigned)sc->slice_x + (uint64_t)sc->slice_width <= f->width
199 && (unsigned)sc->slice_y + (uint64_t)sc->slice_height <= f->height);
200
201
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 6700 if (f->ac == AC_GOLOMB_RICE && sc->slice_width >= (1<<23))
202 ✗ return AVERROR_INVALIDDATA;
203
204
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 20100 for (unsigned i = 0; i < f->plane_count; i++) {
205 13400 PlaneContext * const p = &sc->plane[i];
206 13400 int idx = ff_ffv1_get_symbol(c, state, 0);
207
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 13400 if (idx >= (unsigned)f->quant_table_count) {
208 ✗ av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
209 ✗ return -1;
210 }
211 13400 p->quant_table_index = idx;
212 13400 context_count = f->context_count[idx];
213
214
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 13400 if (p->context_count < context_count) {
215 1344 av_freep(&p->state);
216 1344 av_freep(&p->vlc_state);
217 }
218 13400 p->context_count = context_count;
219 }
220
221 6700 ps = ff_ffv1_get_symbol(c, state, 0);
222
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 6700 if (ps == 1) {
223 ✗ frame->flags |= AV_FRAME_FLAG_INTERLACED;
224 ✗ frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
225
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 6700 } else if (ps == 2) {
226 ✗ frame->flags |= AV_FRAME_FLAG_INTERLACED;
227 ✗ frame->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
228
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 6700 } else if (ps == 3) {
229 6700 frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
230 }
231 6700 frame->sample_aspect_ratio.num = ff_ffv1_get_symbol(c, state, 0);
232 6700 frame->sample_aspect_ratio.den = ff_ffv1_get_symbol(c, state, 0);
233
234
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 6700 if (av_image_check_sar(f->width, f->height,
235 frame->sample_aspect_ratio) < 0) {
236 ✗ av_log(f->avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
237 frame->sample_aspect_ratio.num,
238 frame->sample_aspect_ratio.den);
239 ✗ frame->sample_aspect_ratio = (AVRational){ 0, 1 };
240 }
241
242
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 6700 if (f->version > 3) {
243 ✗ sc->slice_reset_contexts = get_rac(c, state);
244 ✗ sc->slice_coding_mode = ff_ffv1_get_symbol(c, state, 0);
245 ✗ if (sc->slice_coding_mode != 1 && f->colorspace == 1) {
246 ✗ sc->slice_rct_by_coef = ff_ffv1_get_symbol(c, state, 0);
247 ✗ sc->slice_rct_ry_coef = ff_ffv1_get_symbol(c, state, 0);
248 ✗ if ((uint64_t)sc->slice_rct_by_coef + (uint64_t)sc->slice_rct_ry_coef > 4) {
249 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice_rct_y_coef out of range\n");
250 ✗ return AVERROR_INVALIDDATA;
251 }
252 }
253 ✗ if (f->combined_version >= 0x40004) {
254 ✗ sc->remap = ff_ffv1_get_symbol(c, state, 0);
255 ✗ if (sc->remap > 2U ||
256 ✗ sc->remap && !f->flt) {
257 ✗ av_log(f->avctx, AV_LOG_ERROR, "unsupported remap %d\n", sc->remap);
258 ✗ return AVERROR_INVALIDDATA;
259 }
260 }
261 }
262
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 6700 if (f->avctx->bits_per_raw_sample == 32) {
263 ✗ if (!sc->remap) {
264 ✗ av_log(f->avctx, AV_LOG_ERROR, "unsupported remap\n");
265 ✗ return AVERROR_INVALIDDATA;
266 }
267 }
268
269 6700 return 0;
270 }
271
272 ✗ static void slice_set_damaged(FFV1Context *f, FFV1SliceContext *sc)
273 {
274 ✗ sc->slice_damaged = 1;
275
276 // only set this for frame threading, as for slice threading its value is
277 // not used and setting it would be a race
278 ✗ if (f->avctx->active_thread_type & FF_THREAD_FRAME)
279 ✗ f->frame_damaged = 1;
280 ✗ }
281
282 ✗ static int decode_current_mul(RangeCoder *rc, uint8_t state[32], int *mul, int mul_count, int64_t i)
283 {
284 ✗ int ndx = (i * mul_count) >> 32;
285 av_assert2(ndx <= 4096U);
286
287 ✗ if (mul[ndx] < 0)
288 ✗ mul[ndx] = ff_ffv1_get_symbol(rc, state, 0) & 0x3FFFFFFF;
289
290 ✗ return mul[ndx];
291 }
292
293 ✗ static int decode_remap(FFV1Context *f, FFV1SliceContext *sc)
294 {
295 ✗ unsigned int end = (1LL<<f->avctx->bits_per_raw_sample) - 1;
296 ✗ int flip = sc->remap == 2 ? (end>>1) : 0;
297 ✗ const int pixel_num = sc->slice_width * sc->slice_height;
298
299 ✗ for (int p= 0; p < 1 + 2*f->chroma_planes + f->transparency; p++) {
300 ✗ int j = 0;
301 ✗ int lu = 0;
302 uint8_t state[2][3][32];
303 int64_t i;
304 int mul[4096+1];
305 int mul_count;
306
307 ✗ memset(state, 128, sizeof(state));
308 ✗ mul_count = ff_ffv1_get_symbol(&sc->c, state[0][0], 0);
309
310 ✗ if (mul_count > 4096U)
311 ✗ return AVERROR_INVALIDDATA;
312 ✗ for (int i = 0; i<mul_count; i++) {
313 ✗ mul[i] = -1;
314
315 }
316 ✗ mul[mul_count] = 1;
317
318 ✗ memset(state, 128, sizeof(state));
319 ✗ int current_mul = 1;
320 ✗ for (i=0; i <= end ;) {
321 ✗ unsigned run = get_symbol_inline(&sc->c, state[lu][0], 0);
322 ✗ unsigned run0 = lu ? 0 : run;
323 ✗ unsigned run1 = lu ? run : 1;
324
325 ✗ i += run0 * current_mul;
326
327 ✗ while (run1--) {
328 ✗ if (current_mul > 1) {
329 ✗ int delta = get_symbol_inline(&sc->c, state[lu][1], 1);
330 ✗ if (delta <= -current_mul || delta > current_mul/2)
331 ✗ return AVERROR_INVALIDDATA; //not sure we should check this
332 ✗ i += current_mul - 1 + delta;
333 }
334 ✗ if (i - 1 >= end)
335 ✗ break;
336 ✗ if (j >= pixel_num)
337 ✗ return AVERROR_INVALIDDATA;
338 ✗ if (end <= 0xFFFF) {
339 ✗ sc->fltmap [p][j++] = i ^ ((i& 0x8000) ? 0 : flip);
340 } else
341 ✗ sc->fltmap32[p][j++] = i ^ ((i&0x80000000) ? 0 : flip);
342 ✗ i++;
343 ✗ current_mul = decode_current_mul(&sc->c, state[0][2], mul, mul_count, i);
344 }
345 ✗ if (lu) {
346 ✗ i += current_mul;
347 }
348 ✗ lu ^= !run;
349 }
350 ✗ sc->remap_count[p] = j;
351 }
352 ✗ return 0;
353 }
354
355 7700 static int decode_slice(AVCodecContext *c, void *arg)
356 {
357 7700 FFV1Context *f = c->priv_data;
358 7700 FFV1SliceContext *sc = arg;
359 int width, height, x, y, ret;
360 7700 const int ps = av_pix_fmt_desc_get(f->pix_fmt)->comp[0].step;
361 7700 AVFrame * const p = f->picture.f;
362 7700 const int si = sc - f->slices;
363 GetBitContext gb;
364
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 7700 int ac = f->ac || sc->slice_coding_mode == 1;
365
366
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 7700 if (!(p->flags & AV_FRAME_FLAG_KEY) && f->last_picture.f)
367 6928 ff_progress_frame_await(&f->last_picture, si);
368
369
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 7700 if (f->slice_damaged[si])
370 ✗ slice_set_damaged(f, sc);
371
372 7700 sc->slice_rct_by_coef = 1;
373 7700 sc->slice_rct_ry_coef = 1;
374
375
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 7700 if (f->version > 2) {
376
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 6700 if (ff_ffv1_init_slice_state(f, sc) < 0)
377 ✗ return AVERROR(ENOMEM);
378
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 6700 if (decode_slice_header(f, sc, p) < 0) {
379 ✗ sc->slice_x = sc->slice_y = sc->slice_height = sc->slice_width = 0;
380 ✗ slice_set_damaged(f, sc);
381 ✗ return AVERROR_INVALIDDATA;
382 }
383 }
384
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 7700 if ((ret = ff_ffv1_init_slice_state(f, sc)) < 0)
385 ✗ return ret;
386
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 7700 if ((p->flags & AV_FRAME_FLAG_KEY) || sc->slice_reset_contexts) {
387 772 ff_ffv1_clear_slice_state(f, sc);
388
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 6928 } else if (sc->slice_damaged) {
389 ✗ return AVERROR_INVALIDDATA;
390 }
391
392 7700 width = sc->slice_width;
393 7700 height = sc->slice_height;
394 7700 x = sc->slice_x;
395 7700 y = sc->slice_y;
396
397
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 7700 if (sc->remap) {
398 ✗ const int pixel_num = sc->slice_width * sc->slice_height;
399
400 ✗ for(int p = 0; p < 1 + 2*f->chroma_planes + f->transparency ; p++) {
401 ✗ if (f->avctx->bits_per_raw_sample == 32) {
402 ✗ av_fast_malloc(&sc->fltmap32[p], &sc->fltmap32_size[p], pixel_num * sizeof(*sc->fltmap32[p]));
403 ✗ if (!sc->fltmap32[p])
404 ✗ return AVERROR(ENOMEM);
405 } else {
406 ✗ av_fast_malloc(&sc->fltmap[p], &sc->fltmap_size[p], pixel_num * sizeof(*sc->fltmap[p]));
407 ✗ if (!sc->fltmap[p])
408 ✗ return AVERROR(ENOMEM);
409 }
410 }
411
412 ✗ ret = decode_remap(f, sc);
413 ✗ if (ret < 0)
414 ✗ return ret;
415 }
416
417
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 7700 if (ac == AC_GOLOMB_RICE) {
418
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 3700 if (f->combined_version >= 0x30002)
419 2700 get_rac(&sc->c, (uint8_t[]) { 129 });
420
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 3700 sc->ac_byte_count = f->version > 2 || (!x && !y) ? sc->c.bytestream - sc->c.bytestream_start - 1 : 0;
421 3700 init_get_bits(&gb,
422 3700 sc->c.bytestream_start + sc->ac_byte_count,
423 3700 (sc->c.bytestream_end - sc->c.bytestream_start - sc->ac_byte_count) * 8);
424 }
425
426 av_assert1(width && height);
427
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 13800 if (f->colorspace == 0 && (f->chroma_planes || !f->transparency)) {
428 6100 const int chroma_width = AV_CEIL_RSHIFT(width, f->chroma_h_shift);
429 6100 const int chroma_height = AV_CEIL_RSHIFT(height, f->chroma_v_shift);
430 6100 const int cx = x >> f->chroma_h_shift;
431 6100 const int cy = y >> f->chroma_v_shift;
432 6100 decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0, 0, 1, ac);
433
434
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 6100 if (f->chroma_planes) {
435 6100 decode_plane(f, sc, &gb, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1, 1, 1, ac);
436 6100 decode_plane(f, sc, &gb, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1, 2, 1, ac);
437 }
438
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 6100 if (f->transparency)
439 ✗ decode_plane(f, sc, &gb, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], (f->version >= 4 && !f->chroma_planes) ? 1 : 2,
440 ✗ (f->version >= 4 && !f->chroma_planes) ? 1 : 3, 1, ac);
441
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 1600 } else if (f->colorspace == 0) {
442 ✗ decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p->linesize[0] , width, height, p->linesize[0], 0, 0, 2, ac);
443 ✗ decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p->linesize[0] + (ps>>1), width, height, p->linesize[0], 1, 1, 2, ac);
444
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 1600 } else if (f->use32bit) {
445 800 uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0],
446 800 p->data[1] + ps * x + y * p->linesize[1],
447 800 p->data[2] + ps * x + y * p->linesize[2],
448 800 p->data[3] + ps * x + y * p->linesize[3] };
449 800 decode_rgb_frame32(f, sc, &gb, planes, width, height, p->linesize);
450 } else {
451 800 uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0],
452 800 p->data[1] + ps * x + y * p->linesize[1],
453 800 p->data[2] + ps * x + y * p->linesize[2],
454 800 p->data[3] + ps * x + y * p->linesize[3] };
455 800 decode_rgb_frame(f, sc, &gb, planes, width, height, p->linesize);
456 }
457
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 7700 if (ac != AC_GOLOMB_RICE && f->version > 2) {
458 int v;
459 4000 get_rac(&sc->c, (uint8_t[]) { 129 });
460
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 4000 v = sc->c.bytestream_end - sc->c.bytestream - 2 - 5*!!f->ec;
461
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 4000 if (v) {
462 ✗ av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v);
463 ✗ slice_set_damaged(f, sc);
464 }
465 }
466
467
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 7700 if (sc->slice_damaged && (f->avctx->err_recognition & AV_EF_EXPLODE))
468 ✗ return AVERROR_INVALIDDATA;
469
470
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 7700 if ((c->active_thread_type & FF_THREAD_FRAME) && !f->frame_damaged)
471 ✗ ff_progress_frame_report(&f->picture, si);
472
473 7700 return 0;
474 }
475
476 87 static enum AVPixelFormat get_pixel_format(FFV1Context *f)
477 {
478 87 enum AVPixelFormat pix_fmts[] = {
479 #if CONFIG_FFV1_VULKAN_HWACCEL
480 AV_PIX_FMT_VULKAN,
481 #endif
482 87 f->pix_fmt,
483 AV_PIX_FMT_NONE,
484 };
485
486 87 return ff_get_format(f->avctx, pix_fmts);
487 }
488
489 253 static int read_header(FFV1Context *f, RangeCoder *c)
490 {
491 uint8_t state[CONTEXT_SIZE];
492 253 int context_count = -1; //-1 to avoid warning
493 int ret;
494
495 253 memset(state, 128, sizeof(state));
496
497 253 ret = ff_ffv1_parse_header(f, c, state);
498
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 253 if (ret < 0)
499 ✗ return ret;
500
501
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 253 if (f->configured_pix_fmt != f->pix_fmt) {
502 87 f->avctx->pix_fmt = get_pixel_format(f);
503
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 87 if (f->avctx->pix_fmt < 0)
504 ✗ return AVERROR(EINVAL);
505 87 f->configured_pix_fmt = f->pix_fmt;
506 }
507
508 ff_dlog(f->avctx, "%d %d %d\n",
509 f->chroma_h_shift, f->chroma_v_shift, f->pix_fmt);
510
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 253 if (f->version < 2) {
511 24 context_count = ff_ffv1_read_quant_tables(c, f->quant_tables[0]);
512
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 24 if (context_count < 0) {
513 ✗ av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
514 ✗ return AVERROR_INVALIDDATA;
515 }
516 24 f->slice_count = f->max_slice_count;
517
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 229 } else if (f->version < 3) {
518 24 f->slice_count = ff_ffv1_get_symbol(c, state, 0);
519 } else {
520 205 const uint8_t *p = c->bytestream_end;
521 205 for (f->slice_count = 0;
522
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 1035 f->slice_count < MAX_SLICES && 3 + 5*!!f->ec < p - c->bytestream_start;
523 830 f->slice_count++) {
524
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 830 int trailer = 3 + 5*!!f->ec;
525 830 int size = AV_RB24(p-trailer);
526
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 830 if (size + trailer > p - c->bytestream_start)
527 ✗ break;
528 830 p -= size + trailer;
529 }
530 }
531
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 253 if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0 || f->slice_count > f->max_slice_count) {
532 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid (max=%d)\n", f->slice_count, f->max_slice_count);
533 ✗ return AVERROR_INVALIDDATA;
534 }
535
536 253 av_refstruct_unref(&f->slice_damaged);
537 253 f->slice_damaged = av_refstruct_allocz(f->slice_count * sizeof(*f->slice_damaged));
538
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 253 if (!f->slice_damaged)
539 ✗ return AVERROR(ENOMEM);
540
541
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 1203 for (int j = 0; j < f->slice_count; j++) {
542 950 FFV1SliceContext *sc = &f->slices[j];
543
544
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 950 if (f->version == 2) {
545 96 int sx = ff_ffv1_get_symbol(c, state, 0);
546 96 int sy = ff_ffv1_get_symbol(c, state, 0);
547 96 int sw = ff_ffv1_get_symbol(c, state, 0) + 1U;
548 96 int sh = ff_ffv1_get_symbol(c, state, 0) + 1U;
549
550
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 96 if (sx < 0 || sy < 0 || sw <= 0 || sh <= 0)
551 ✗ return AVERROR_INVALIDDATA;
552
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 96 if (sx > f->num_h_slices - sw || sy > f->num_v_slices - sh)
553 ✗ return AVERROR_INVALIDDATA;
554
555 96 sc->slice_x = sx * (int64_t)f->width / f->num_h_slices;
556 96 sc->slice_y = sy * (int64_t)f->height / f->num_v_slices;
557 96 sc->slice_width = (sx + sw) * (int64_t)f->width / f->num_h_slices - sc->slice_x;
558 96 sc->slice_height = (sy + sh) * (int64_t)f->height / f->num_v_slices - sc->slice_y;
559
560
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 96 av_assert0((unsigned)sc->slice_width <= f->width &&
561 (unsigned)sc->slice_height <= f->height);
562
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 96 av_assert0 ( (unsigned)sc->slice_x + (uint64_t)sc->slice_width <= f->width
563 && (unsigned)sc->slice_y + (uint64_t)sc->slice_height <= f->height);
564 }
565
566 950 av_refstruct_unref(&sc->plane);
567 950 sc->plane = ff_ffv1_planes_alloc();
568
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 950 if (!sc->plane)
569 ✗ return AVERROR(ENOMEM);
570
571
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 2850 for (int i = 0; i < f->plane_count; i++) {
572 1900 PlaneContext *const p = &sc->plane[i];
573
574
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 1900 if (f->version == 2) {
575 192 int idx = ff_ffv1_get_symbol(c, state, 0);
576
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 192 if (idx >= (unsigned)f->quant_table_count) {
577 ✗ av_log(f->avctx, AV_LOG_ERROR,
578 "quant_table_index out of range\n");
579 ✗ return AVERROR_INVALIDDATA;
580 }
581 192 p->quant_table_index = idx;
582 192 context_count = f->context_count[idx];
583 }
584
585
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 1900 if (f->version <= 2) {
586
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 240 av_assert0(context_count >= 0);
587 240 p->context_count = context_count;
588 }
589 }
590 }
591 253 return 0;
592 }
593
594 88 static av_cold int decode_init(AVCodecContext *avctx)
595 {
596 88 FFV1Context *f = avctx->priv_data;
597 int ret;
598
599 88 f->pix_fmt = AV_PIX_FMT_NONE;
600 88 f->configured_pix_fmt = AV_PIX_FMT_NONE;
601
602
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 88 if ((ret = ff_ffv1_common_init(avctx, f)) < 0)
603 ✗ return ret;
604
605
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 88 if (avctx->extradata_size > 0 && (ret = ff_ffv1_read_extra_header(f)) < 0)
606 ✗ return ret;
607
608
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 88 if ((ret = ff_ffv1_init_slice_contexts(f)) < 0)
609 ✗ return ret;
610
611 88 return 0;
612 }
613
614 7700 static int find_next_slice(AVCodecContext *avctx,
615 uint8_t *buf, uint8_t *buf_end, int idx,
616 uint8_t **pos, uint32_t *len)
617 {
618 7700 FFV1Context *f = avctx->priv_data;
619
620 /* Length field */
621 7700 uint32_t v = buf_end - buf;
622
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 7700 if (idx || f->version > 2) {
623 /* Three bytes of length, plus flush bit + CRC */
624
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 7300 uint32_t trailer = 3 + 5*!!f->ec;
625
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 7300 if (trailer > buf_end - buf)
626 ✗ v = INT_MAX;
627 else
628 7300 v = AV_RB24(buf_end - trailer) + trailer;
629 }
630
631
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 7700 if (buf_end - buf < v) {
632 ✗ av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
633 ✗ ff_progress_frame_report(&f->picture, INT_MAX);
634 ✗ return AVERROR_INVALIDDATA;
635 }
636
637 7700 *len = v;
638
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 7700 if (idx)
639 5625 *pos = buf_end - v;
640 else
641 2075 *pos = buf;
642
643 7700 return 0;
644 }
645
646 2120 static int decode_header(AVCodecContext *avctx, RangeCoder *c,
647 uint8_t *buf, size_t buf_size)
648 {
649 int ret;
650 2120 FFV1Context *f = avctx->priv_data;
651
652 2120 uint8_t keystate = 128;
653 2120 ff_init_range_decoder(c, buf, buf_size);
654 2120 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
655
656
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 2120 if (get_rac(c, &keystate)) {
657 253 f->key_frame = AV_FRAME_FLAG_KEY;
658 253 f->key_frame_ok = 0;
659
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 253 if ((ret = read_header(f, c)) < 0)
660 ✗ return ret;
661 253 f->key_frame_ok = 1;
662 } else {
663
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 1867 if (!f->key_frame_ok) {
664 ✗ av_log(avctx, AV_LOG_ERROR,
665 "Cannot decode non-keyframe without valid keyframe\n");
666 ✗ return AVERROR_INVALIDDATA;
667 }
668 1867 f->key_frame = 0;
669 }
670
671
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 2120 if (f->ac != AC_GOLOMB_RICE) {
672
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 1022 if (buf_size < avctx->width * avctx->height / (128*8))
673 ✗ return AVERROR_INVALIDDATA;
674 } else {
675 1098 int w = avctx->width;
676 1098 int s = 1 + w / (1<<23);
677 int i;
678
679 1098 w /= s;
680
681
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 26330 for (i = 0; w > (1<<ff_log2_run[i]); i++)
682 25232 w -= ff_log2_run[i];
683
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 1098 if (buf_size < (avctx->height + i + 6) / 8 * s)
684 ✗ return AVERROR_INVALIDDATA;
685 }
686
687 2120 return 0;
688 }
689
690 2075 static int decode_slices(AVCodecContext *avctx, RangeCoder c,
691 AVPacket *avpkt)
692 {
693 2075 FFV1Context *f = avctx->priv_data;
694 2075 AVFrame *p = f->picture.f;
695
696 2075 uint8_t *buf = avpkt->data;
697 2075 size_t buf_size = avpkt->size;
698 2075 uint8_t *buf_end = buf + buf_size;
699
700
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 9775 for (int i = f->slice_count - 1; i >= 0; i--) {
701 7700 FFV1SliceContext *sc = &f->slices[i];
702
703 uint8_t *pos;
704 uint32_t len;
705 7700 int err = find_next_slice(avctx, buf, buf_end, i,
706 &pos, &len);
707
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 7700 if (err < 0)
708 ✗ return err;
709
710 7700 buf_end -= len;
711
712 7700 sc->slice_damaged = 0;
713
714
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 7700 if (f->ec) {
715 6700 unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), f->crcref, pos, len);
716
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 6700 if (crc != f->crcref) {
717 ✗ int64_t ts = avpkt->pts != AV_NOPTS_VALUE ? avpkt->pts : avpkt->dts;
718 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice CRC mismatch %X!", crc);
719 ✗ if (ts != AV_NOPTS_VALUE && avctx->pkt_timebase.num) {
720 ✗ av_log(f->avctx, AV_LOG_ERROR, "at %f seconds\n", ts*av_q2d(avctx->pkt_timebase));
721 ✗ } else if (ts != AV_NOPTS_VALUE) {
722 ✗ av_log(f->avctx, AV_LOG_ERROR, "at %"PRId64"\n", ts);
723 } else {
724 ✗ av_log(f->avctx, AV_LOG_ERROR, "\n");
725 }
726 ✗ slice_set_damaged(f, sc);
727 }
728
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 6700 if (avctx->debug & FF_DEBUG_PICT_INFO) {
729 ✗ av_log(avctx, AV_LOG_DEBUG, "slice %d, CRC: 0x%08"PRIX32"\n", i, AV_RB32(pos + len - 4));
730 }
731 }
732
733
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 7700 if (i) {
734 5625 ff_init_range_decoder(&sc->c, pos, len);
735 5625 ff_build_rac_states(&sc->c, 0.05 * (1LL << 32), 256 - 8);
736 } else {
737 2075 sc->c = c;
738 2075 sc->c.bytestream_end = pos + len;
739 }
740 }
741
742 2075 avctx->execute(avctx,
743 decode_slice,
744 2075 f->slices,
745 NULL,
746 f->slice_count,
747 sizeof(*f->slices));
748
749
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 9775 for (int i = f->slice_count - 1; i >= 0; i--) {
750 7700 FFV1SliceContext *sc = &f->slices[i];
751
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 7700 if (sc->slice_damaged && f->last_picture.f) {
752 ✗ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(f->pix_fmt);
753 const uint8_t *src[4];
754 uint8_t *dst[4];
755 ✗ ff_progress_frame_await(&f->last_picture, INT_MAX);
756 ✗ for (int j = 0; j < desc->nb_components; j++) {
757 ✗ int pixshift = desc->comp[j].depth > 8;
758 ✗ int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;
759 ✗ int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;
760 ✗ dst[j] = p->data[j] + p->linesize[j] *
761 ✗ (sc->slice_y >> sv) + ((sc->slice_x >> sh) << pixshift);
762 ✗ src[j] = f->last_picture.f->data[j] + f->last_picture.f->linesize[j] *
763 ✗ (sc->slice_y >> sv) + ((sc->slice_x >> sh) << pixshift);
764
765 }
766
767 ✗ av_image_copy(dst, p->linesize, src,
768 ✗ f->last_picture.f->linesize,
769 f->pix_fmt,
770 sc->slice_width,
771 sc->slice_height);
772
773 ✗ f->slice_damaged[i] = 1;
774 }
775 }
776
777 2075 return 0;
778 }
779
780 2120 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
781 int *got_frame, AVPacket *avpkt)
782 {
783 2120 FFV1Context *f = avctx->priv_data;
784 int ret;
785 AVFrame *p;
786 2120 const FFHWAccel *hwaccel = NULL;
787
788 /* This is copied onto the first slice's range coder context */
789 RangeCoder c;
790
791 2120 ff_progress_frame_unref(&f->last_picture);
792 2120 av_refstruct_unref(&f->hwaccel_last_picture_private);
793
794 2120 FFSWAP(ProgressFrame, f->picture, f->last_picture);
795 2120 FFSWAP(void *, f->hwaccel_picture_private, f->hwaccel_last_picture_private);
796
797 2120 f->avctx = avctx;
798 2120 f->frame_damaged = 0;
799
800 2120 ret = decode_header(avctx, &c, avpkt->data, avpkt->size);
801
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 2120 if (ret < 0)
802 ✗ return ret;
803
804
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 2120 if (avctx->debug & FF_DEBUG_PICT_INFO)
805 ✗ av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
806 ✗ f->version, !!f->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);
807
808
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 2120 if (avctx->skip_frame >= AVDISCARD_ALL)
809 45 return avpkt->size;
810
811
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 2075 if (avctx->hwaccel)
812 ✗ hwaccel = ffhwaccel(avctx->hwaccel);
813
814 2075 ret = ff_progress_frame_get_buffer(avctx, &f->picture,
815 AV_GET_BUFFER_FLAG_REF);
816
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 2075 if (ret < 0)
817 ✗ return ret;
818
819 2075 ret = ff_hwaccel_frame_priv_alloc(avctx, &f->hwaccel_picture_private);
820
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 2075 if (ret < 0)
821 ✗ return ret;
822
823 2075 p = f->picture.f;
824
825 2075 p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P
826 2075 p->flags = (p->flags & ~AV_FRAME_FLAG_KEY) | f->key_frame;
827
828
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 2075 if (f->version < 3 && avctx->field_order > AV_FIELD_PROGRESSIVE) {
829 /* we have interlaced material flagged in container */
830 ✗ p->flags |= AV_FRAME_FLAG_INTERLACED;
831 ✗ if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
832 ✗ p->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
833 }
834
835 /* Start */
836
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 2075 if (hwaccel) {
837 ✗ ret = hwaccel->start_frame(avctx, avpkt->buf, avpkt->data, avpkt->size);
838 ✗ if (ret < 0)
839 ✗ return ret;
840 }
841
842 2075 ff_thread_finish_setup(avctx);
843
844 /* Decode slices */
845
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 2075 if (hwaccel) {
846 ✗ uint8_t *buf_end = avpkt->data + avpkt->size;
847
848 ✗ if (!(p->flags & AV_FRAME_FLAG_KEY) && f->last_picture.f)
849 ✗ ff_progress_frame_await(&f->last_picture, f->slice_count - 1);
850
851 ✗ for (int i = f->slice_count - 1; i >= 0; i--) {
852 uint8_t *pos;
853 uint32_t len;
854 ✗ ret = find_next_slice(avctx, avpkt->data, buf_end, i,
855 &pos, &len);
856 ✗ if (ret < 0)
857 ✗ return ret;
858
859 ✗ buf_end -= len;
860
861 ✗ ret = hwaccel->decode_slice(avctx, pos, len);
862 ✗ if (ret < 0)
863 ✗ return ret;
864 }
865 } else {
866 2075 ret = decode_slices(avctx, c, avpkt);
867
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 2075 if (ret < 0)
868 ✗ return ret;
869 }
870
871 /* Finalize */
872
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 2075 if (hwaccel) {
873 ✗ ret = hwaccel->end_frame(avctx);
874 ✗ if (ret < 0)
875 ✗ return ret;
876 }
877
878 2075 ff_progress_frame_report(&f->picture, INT_MAX);
879
880 2075 ff_progress_frame_unref(&f->last_picture);
881 2075 av_refstruct_unref(&f->hwaccel_last_picture_private);
882
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 2075 if ((ret = av_frame_ref(rframe, f->picture.f)) < 0)
883 ✗ return ret;
884
885 2075 *got_frame = 1;
886
887 2075 return avpkt->size;
888 }
889
890 #if HAVE_THREADS
891 ✗ static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
892 {
893 ✗ FFV1Context *fsrc = src->priv_data;
894 ✗ FFV1Context *fdst = dst->priv_data;
895
896 ✗ if (dst == src)
897 ✗ return 0;
898
899 ✗ fdst->version = fsrc->version;
900 ✗ fdst->micro_version = fsrc->micro_version;
901 ✗ fdst->combined_version = fsrc->combined_version;
902 ✗ fdst->chroma_planes = fsrc->chroma_planes;
903 ✗ fdst->chroma_h_shift = fsrc->chroma_h_shift;
904 ✗ fdst->chroma_v_shift = fsrc->chroma_v_shift;
905 ✗ fdst->transparency = fsrc->transparency;
906 ✗ fdst->plane_count = fsrc->plane_count;
907 ✗ fdst->ac = fsrc->ac;
908 ✗ fdst->colorspace = fsrc->colorspace;
909 ✗ fdst->pix_fmt = fsrc->pix_fmt;
910 ✗ fdst->configured_pix_fmt = fsrc->configured_pix_fmt;
911
912 ✗ fdst->ec = fsrc->ec;
913 ✗ fdst->intra = fsrc->intra;
914 ✗ fdst->key_frame_ok = fsrc->key_frame_ok;
915
916 ✗ fdst->packed_at_lsb = fsrc->packed_at_lsb;
917 ✗ fdst->slice_count = fsrc->slice_count;
918 ✗ fdst->use32bit = fsrc->use32bit;
919 ✗ memcpy(fdst->state_transition, fsrc->state_transition,
920 sizeof(fdst->state_transition));
921
922 // in version 1 there is a single per-keyframe quant table, so
923 // we need to propagate it between threads
924 ✗ if (fsrc->version < 2)
925 ✗ memcpy(fdst->quant_tables[0], fsrc->quant_tables[0], sizeof(fsrc->quant_tables[0]));
926
927 ✗ for (int i = 0; i < fdst->num_h_slices * fdst->num_v_slices; i++) {
928 ✗ FFV1SliceContext *sc = &fdst->slices[i];
929 ✗ const FFV1SliceContext *sc0 = &fsrc->slices[i];
930
931 ✗ av_refstruct_replace(&sc->plane, sc0->plane);
932
933 ✗ if (fsrc->version < 3) {
934 ✗ sc->slice_x = sc0->slice_x;
935 ✗ sc->slice_y = sc0->slice_y;
936 ✗ sc->slice_width = sc0->slice_width;
937 ✗ sc->slice_height = sc0->slice_height;
938 }
939 }
940
941 ✗ av_refstruct_replace(&fdst->slice_damaged, fsrc->slice_damaged);
942
943 av_assert1(fdst->max_slice_count == fsrc->max_slice_count);
944
945 ✗ ff_progress_frame_replace(&fdst->picture, &fsrc->picture);
946 ✗ av_refstruct_replace(&fdst->hwaccel_picture_private,
947 ✗ fsrc->hwaccel_picture_private);
948
949 ✗ return 0;
950 }
951 #endif
952
953 88 static av_cold int ffv1_decode_close(AVCodecContext *avctx)
954 {
955 88 FFV1Context *const s = avctx->priv_data;
956
957 88 ff_progress_frame_unref(&s->picture);
958 88 av_refstruct_unref(&s->hwaccel_picture_private);
959
960 88 ff_progress_frame_unref(&s->last_picture);
961 88 av_refstruct_unref(&s->hwaccel_last_picture_private);
962
963 88 ff_ffv1_close(s);
964
965 88 return 0;
966 }
967
968 const FFCodec ff_ffv1_decoder = {
969 .p.name = "ffv1",
970 CODEC_LONG_NAME("FFmpeg video codec #1"),
971 .p.type = AVMEDIA_TYPE_VIDEO,
972 .p.id = AV_CODEC_ID_FFV1,
973 .priv_data_size = sizeof(FFV1Context),
974 .init = decode_init,
975 .close = ffv1_decode_close,
976 FF_CODEC_DECODE_CB(decode_frame),
977 UPDATE_THREAD_CONTEXT(update_thread_context),
978 .p.capabilities = AV_CODEC_CAP_DR1 |
979 AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,
980 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
981 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
982 FF_CODEC_CAP_USES_PROGRESSFRAMES,
983 .hw_configs = (const AVCodecHWConfigInternal *const []) {
984 #if CONFIG_FFV1_VULKAN_HWACCEL
985 HWACCEL_VULKAN(ffv1),
986 #endif
987 NULL
988 },
989 };
990