FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ffv1dec.c
Date: 2025-08-19 23:55:23
Exec Total Coverage
Lines: 311 555 56.0%
Functions: 13 17 76.5%
Branches: 184 420 43.8%
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
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 163659991 if (k > bits) {
60 ff_dlog(NULL, "k-overflow bias:%d error:%d drift:%d count:%d k:%d",
61 state->bias, state->error_sum, state->drift, state->count, k);
62 ✗ k = bits;
63 }
64
65 163659991 v = get_sr_golomb(gb, k, 12, bits);
66 ff_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",
67 v, state->bias, state->error_sum, state->drift, state->count, k);
68
69 163659991 v ^= ((2 * state->drift + state->count) >> 31);
70
71 163659991 ret = fold(v + state->bias, bits);
72
73 163659991 update_vlc_state(state, v);
74
75 163659991 return ret;
76 }
77
78 4542400 static int is_input_end(RangeCoder *c, GetBitContext *gb, int ac)
79 {
80
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 4542400 if (ac != AC_GOLOMB_RICE) {
81
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 2514800 if (c->overread > MAX_OVERREAD)
82 ✗ return AVERROR_INVALIDDATA;
83 } else {
84
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 2027600 if (get_bits_left(gb) < 1)
85 ✗ return AVERROR_INVALIDDATA;
86 }
87 4542400 return 0;
88 }
89
90 #define TYPE int16_t
91 #define RENAME(name) name
92 #include "ffv1dec_template.c"
93 #undef TYPE
94 #undef RENAME
95
96 #define TYPE int32_t
97 #define RENAME(name) name ## 32
98 #include "ffv1dec_template.c"
99
100 18300 static int decode_plane(FFV1Context *f, FFV1SliceContext *sc,
101 GetBitContext *gb,
102 uint8_t *src, int w, int h, int stride, int plane_index,
103 int remap_index, int pixel_stride, int ac)
104 {
105 int x, y;
106 int16_t *sample[2];
107 int bits;
108 unsigned mask;
109
110
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 18300 if (sc->remap) {
111 ✗ bits = av_ceil_log2(sc->remap_count[remap_index]);
112 ✗ mask = (1<<bits)-1;
113 } else {
114 18300 bits = f->avctx->bits_per_raw_sample;
115 }
116
117 18300 sample[0] = sc->sample_buffer + 3;
118 18300 sample[1] = sc->sample_buffer + w + 6 + 3;
119
120 18300 sc->run_index = 0;
121
122 18300 memset(sc->sample_buffer, 0, 2 * (w + 6) * sizeof(*sc->sample_buffer));
123
124
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 1750700 for (y = 0; y < h; y++) {
125 1732400 int16_t *temp = sample[0]; // FIXME: try a normal buffer
126
127 1732400 sample[0] = sample[1];
128 1732400 sample[1] = temp;
129
130 1732400 sample[1][-1] = sample[0][0];
131 1732400 sample[0][w] = sample[0][w - 1];
132
133
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 1732400 if (f->avctx->bits_per_raw_sample <= 8) {
134 924200 int ret = decode_line(f, sc, gb, w, sample, plane_index, 8, ac);
135
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 924200 if (ret < 0)
136 ✗ return ret;
137
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 924200 if (sc->remap)
138 ✗ for (x = 0; x < w; x++)
139 ✗ sample[1][x] = sc->fltmap[remap_index][sample[1][x]];
140
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 146178100 for (x = 0; x < w; x++)
141 145253900 src[x*pixel_stride + stride * y] = sample[1][x];
142 } else {
143 808200 int ret = decode_line(f, sc, gb, w, sample, plane_index, bits, ac);
144
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 808200 if (ret < 0)
145 ✗ return ret;
146
147
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 808200 if (sc->remap) {
148 ✗ if (f->packed_at_lsb || f->avctx->bits_per_raw_sample == 16) {
149 ✗ for (x = 0; x < w; x++) {
150 ✗ ((uint16_t*)(src + stride*y))[x*pixel_stride] = sc->fltmap[remap_index][sample[1][x] & mask];
151 }
152 } else {
153 ✗ for (x = 0; x < w; x++) {
154 ✗ int v = sc->fltmap[remap_index][sample[1][x] & mask];
155 ✗ ((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);
156 }
157 }
158 } else {
159
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 808200 if (f->packed_at_lsb || f->avctx->bits_per_raw_sample == 16) {
160
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 107664400 for (x = 0; x < w; x++) {
161 106856200 ((uint16_t*)(src + stride*y))[x*pixel_stride] = sample[1][x];
162 }
163 } else {
164 ✗ for (x = 0; x < w; x++) {
165 ✗ ((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);
166 }
167 }
168 }
169 }
170 }
171 18300 return 0;
172 }
173
174 6700 static int decode_slice_header(const FFV1Context *f,
175 FFV1SliceContext *sc, AVFrame *frame)
176 {
177 6700 RangeCoder *c = &sc->c;
178 uint8_t state[CONTEXT_SIZE];
179 unsigned ps, context_count;
180 int sx, sy, sw, sh;
181
182 6700 memset(state, 128, sizeof(state));
183 6700 sx = ff_ffv1_get_symbol(c, state, 0);
184 6700 sy = ff_ffv1_get_symbol(c, state, 0);
185 6700 sw = ff_ffv1_get_symbol(c, state, 0) + 1U;
186 6700 sh = ff_ffv1_get_symbol(c, state, 0) + 1U;
187
188
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 6700 av_assert0(f->version > 2);
189
190
191
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 6700 if (sx < 0 || sy < 0 || sw <= 0 || sh <= 0)
192 ✗ return AVERROR_INVALIDDATA;
193
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 6700 if (sx > f->num_h_slices - sw || sy > f->num_v_slices - sh)
194 ✗ return AVERROR_INVALIDDATA;
195
196 6700 sc->slice_x = ff_slice_coord(f, f->width , sx , f->num_h_slices, f->chroma_h_shift);
197 6700 sc->slice_y = ff_slice_coord(f, f->height, sy , f->num_v_slices, f->chroma_v_shift);
198 6700 sc->slice_width = ff_slice_coord(f, f->width , sx + sw, f->num_h_slices, f->chroma_h_shift) - sc->slice_x;
199 6700 sc->slice_height = ff_slice_coord(f, f->height, sy + sh, f->num_v_slices, f->chroma_v_shift) - sc->slice_y;
200
201
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 6700 av_assert0((unsigned)sc->slice_width <= f->width &&
202 (unsigned)sc->slice_height <= f->height);
203
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 6700 av_assert0 ( (unsigned)sc->slice_x + (uint64_t)sc->slice_width <= f->width
204 && (unsigned)sc->slice_y + (uint64_t)sc->slice_height <= f->height);
205
206
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 6700 if (f->ac == AC_GOLOMB_RICE && sc->slice_width >= (1<<23))
207 ✗ return AVERROR_INVALIDDATA;
208
209
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 20100 for (unsigned i = 0; i < f->plane_count; i++) {
210 13400 PlaneContext * const p = &sc->plane[i];
211 13400 int idx = ff_ffv1_get_symbol(c, state, 0);
212
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 13400 if (idx >= (unsigned)f->quant_table_count) {
213 ✗ av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
214 ✗ return -1;
215 }
216 13400 p->quant_table_index = idx;
217 13400 context_count = f->context_count[idx];
218
219
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 13400 if (p->context_count < context_count) {
220 1344 av_freep(&p->state);
221 1344 av_freep(&p->vlc_state);
222 }
223 13400 p->context_count = context_count;
224 }
225
226 6700 ps = ff_ffv1_get_symbol(c, state, 0);
227
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 6700 if (ps == 1) {
228 ✗ frame->flags |= AV_FRAME_FLAG_INTERLACED;
229 ✗ frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
230
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 6700 } else if (ps == 2) {
231 ✗ frame->flags |= AV_FRAME_FLAG_INTERLACED;
232 ✗ frame->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
233
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 6700 } else if (ps == 3) {
234 6700 frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
235 }
236 6700 frame->sample_aspect_ratio.num = ff_ffv1_get_symbol(c, state, 0);
237 6700 frame->sample_aspect_ratio.den = ff_ffv1_get_symbol(c, state, 0);
238
239
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 6700 if (av_image_check_sar(f->width, f->height,
240 frame->sample_aspect_ratio) < 0) {
241 ✗ av_log(f->avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
242 frame->sample_aspect_ratio.num,
243 frame->sample_aspect_ratio.den);
244 ✗ frame->sample_aspect_ratio = (AVRational){ 0, 1 };
245 }
246
247
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 6700 if (f->version > 3) {
248 ✗ sc->slice_reset_contexts = get_rac(c, state);
249 ✗ sc->slice_coding_mode = ff_ffv1_get_symbol(c, state, 0);
250 ✗ if (sc->slice_coding_mode != 1 && f->colorspace == 1) {
251 ✗ sc->slice_rct_by_coef = ff_ffv1_get_symbol(c, state, 0);
252 ✗ sc->slice_rct_ry_coef = ff_ffv1_get_symbol(c, state, 0);
253 ✗ if ((uint64_t)sc->slice_rct_by_coef + (uint64_t)sc->slice_rct_ry_coef > 4) {
254 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice_rct_y_coef out of range\n");
255 ✗ return AVERROR_INVALIDDATA;
256 }
257 }
258 ✗ if (f->combined_version >= 0x40004) {
259 ✗ sc->remap = ff_ffv1_get_symbol(c, state, 0);
260 ✗ if (sc->remap > 2U ||
261 ✗ sc->remap && !f->flt) {
262 ✗ av_log(f->avctx, AV_LOG_ERROR, "unsupported remap %d\n", sc->remap);
263 ✗ return AVERROR_INVALIDDATA;
264 }
265 }
266 }
267
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 6700 if (f->avctx->bits_per_raw_sample == 32) {
268 ✗ if (!sc->remap) {
269 ✗ av_log(f->avctx, AV_LOG_ERROR, "unsupported remap\n");
270 ✗ return AVERROR_INVALIDDATA;
271 }
272 }
273
274 6700 return 0;
275 }
276
277 ✗ static void slice_set_damaged(FFV1Context *f, FFV1SliceContext *sc)
278 {
279 ✗ sc->slice_damaged = 1;
280
281 // only set this for frame threading, as for slice threading its value is
282 // not used and setting it would be a race
283 ✗ if (f->avctx->active_thread_type & FF_THREAD_FRAME)
284 ✗ f->frame_damaged = 1;
285 ✗ }
286
287 ✗ static int decode_current_mul(RangeCoder *rc, uint8_t state[32], int *mul, int mul_count, int64_t i)
288 {
289 ✗ int ndx = (i * mul_count) >> 32;
290 av_assert2(ndx <= 4096U);
291
292 ✗ if (mul[ndx] < 0)
293 ✗ mul[ndx] = ff_ffv1_get_symbol(rc, state, 0) & 0x3FFFFFFF;
294
295 ✗ return mul[ndx];
296 }
297
298 ✗ static int decode_remap(FFV1Context *f, FFV1SliceContext *sc)
299 {
300 ✗ unsigned int end = (1LL<<f->avctx->bits_per_raw_sample) - 1;
301 ✗ int flip = sc->remap == 2 ? (end>>1) : 0;
302 ✗ const int pixel_num = sc->slice_width * sc->slice_height;
303
304 ✗ for (int p= 0; p < 1 + 2*f->chroma_planes + f->transparency; p++) {
305 ✗ int j = 0;
306 ✗ int lu = 0;
307 uint8_t state[2][3][32];
308 int64_t i;
309 int mul[4096+1];
310 int mul_count;
311
312 ✗ memset(state, 128, sizeof(state));
313 ✗ mul_count = ff_ffv1_get_symbol(&sc->c, state[0][0], 0);
314
315 ✗ if (mul_count > 4096U)
316 ✗ return AVERROR_INVALIDDATA;
317 ✗ for (int i = 0; i<mul_count; i++) {
318 ✗ mul[i] = -1;
319
320 }
321 ✗ mul[mul_count] = 1;
322
323 ✗ memset(state, 128, sizeof(state));
324 ✗ int current_mul = 1;
325 ✗ for (i=0; i <= end ;) {
326 ✗ unsigned run = get_symbol_inline(&sc->c, state[lu][0], 0);
327 ✗ unsigned run0 = lu ? 0 : run;
328 ✗ unsigned run1 = lu ? run : 1;
329
330 ✗ i += run0 * current_mul;
331
332 ✗ while (run1--) {
333 ✗ if (current_mul > 1) {
334 ✗ int delta = get_symbol_inline(&sc->c, state[lu][1], 1);
335 ✗ if (delta <= -current_mul || delta > current_mul/2)
336 ✗ return AVERROR_INVALIDDATA; //not sure we should check this
337 ✗ i += current_mul - 1 + delta;
338 }
339 ✗ if (i - 1 >= end)
340 ✗ break;
341 ✗ if (j >= pixel_num)
342 ✗ return AVERROR_INVALIDDATA;
343 ✗ if (end <= 0xFFFF) {
344 ✗ sc->fltmap [p][j++] = i ^ ((i& 0x8000) ? 0 : flip);
345 } else
346 ✗ sc->fltmap32[p][j++] = i ^ ((i&0x80000000) ? 0 : flip);
347 ✗ i++;
348 ✗ current_mul = decode_current_mul(&sc->c, state[0][2], mul, mul_count, i);
349 }
350 ✗ if (lu) {
351 ✗ i += current_mul;
352 }
353 ✗ lu ^= !run;
354 }
355 ✗ sc->remap_count[p] = j;
356 }
357 ✗ return 0;
358 }
359
360 7700 static int decode_slice(AVCodecContext *c, void *arg)
361 {
362 7700 FFV1Context *f = c->priv_data;
363 7700 FFV1SliceContext *sc = arg;
364 int width, height, x, y, ret;
365 7700 const int ps = av_pix_fmt_desc_get(f->pix_fmt)->comp[0].step;
366 7700 AVFrame * const p = f->picture.f;
367 7700 const int si = sc - f->slices;
368 GetBitContext gb;
369
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 7700 int ac = f->ac || sc->slice_coding_mode == 1;
370
371
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 7700 if (!(p->flags & AV_FRAME_FLAG_KEY) && f->last_picture.f)
372 6928 ff_progress_frame_await(&f->last_picture, si);
373
374
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 7700 if (f->slice_damaged[si])
375 ✗ slice_set_damaged(f, sc);
376
377 7700 sc->slice_rct_by_coef = 1;
378 7700 sc->slice_rct_ry_coef = 1;
379
380
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 7700 if (f->version > 2) {
381
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 6700 if (ff_ffv1_init_slice_state(f, sc) < 0)
382 ✗ return AVERROR(ENOMEM);
383
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 6700 if (decode_slice_header(f, sc, p) < 0) {
384 ✗ sc->slice_x = sc->slice_y = sc->slice_height = sc->slice_width = 0;
385 ✗ slice_set_damaged(f, sc);
386 ✗ return AVERROR_INVALIDDATA;
387 }
388 }
389
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 7700 if ((ret = ff_ffv1_init_slice_state(f, sc)) < 0)
390 ✗ return ret;
391
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 7700 if ((p->flags & AV_FRAME_FLAG_KEY) || sc->slice_reset_contexts) {
392 772 ff_ffv1_clear_slice_state(f, sc);
393
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 6928 } else if (sc->slice_damaged) {
394 ✗ return AVERROR_INVALIDDATA;
395 }
396
397 7700 width = sc->slice_width;
398 7700 height = sc->slice_height;
399 7700 x = sc->slice_x;
400 7700 y = sc->slice_y;
401
402
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 7700 if (sc->remap) {
403 ✗ const int pixel_num = sc->slice_width * sc->slice_height;
404
405 ✗ for(int p = 0; p < 1 + 2*f->chroma_planes + f->transparency ; p++) {
406 ✗ if (f->avctx->bits_per_raw_sample == 32) {
407 ✗ av_fast_malloc(&sc->fltmap32[p], &sc->fltmap32_size[p], pixel_num * sizeof(*sc->fltmap32[p]));
408 ✗ if (!sc->fltmap32[p])
409 ✗ return AVERROR(ENOMEM);
410 } else {
411 ✗ av_fast_malloc(&sc->fltmap[p], &sc->fltmap_size[p], pixel_num * sizeof(*sc->fltmap[p]));
412 ✗ if (!sc->fltmap[p])
413 ✗ return AVERROR(ENOMEM);
414 }
415 }
416
417 ✗ ret = decode_remap(f, sc);
418 ✗ if (ret < 0)
419 ✗ return ret;
420 }
421
422
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 7700 if (ac == AC_GOLOMB_RICE) {
423
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 3700 if (f->combined_version >= 0x30002)
424 2700 get_rac(&sc->c, (uint8_t[]) { 129 });
425
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 3700 sc->ac_byte_count = f->version > 2 || (!x && !y) ? sc->c.bytestream - sc->c.bytestream_start - 1 : 0;
426 3700 init_get_bits(&gb,
427 3700 sc->c.bytestream_start + sc->ac_byte_count,
428 3700 (sc->c.bytestream_end - sc->c.bytestream_start - sc->ac_byte_count) * 8);
429 }
430
431 av_assert1(width && height);
432
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 13800 if (f->colorspace == 0 && (f->chroma_planes || !f->transparency)) {
433 6100 const int chroma_width = AV_CEIL_RSHIFT(width, f->chroma_h_shift);
434 6100 const int chroma_height = AV_CEIL_RSHIFT(height, f->chroma_v_shift);
435 6100 const int cx = x >> f->chroma_h_shift;
436 6100 const int cy = y >> f->chroma_v_shift;
437 6100 decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0, 0, 1, ac);
438
439
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 6100 if (f->chroma_planes) {
440 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);
441 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);
442 }
443
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 6100 if (f->transparency)
444 ✗ 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,
445 ✗ (f->version >= 4 && !f->chroma_planes) ? 1 : 3, 1, ac);
446
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 1600 } else if (f->colorspace == 0) {
447 ✗ decode_plane(f, sc, &gb, p->data[0] + ps*x + y*p->linesize[0] , width, height, p->linesize[0], 0, 0, 2, ac);
448 ✗ 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);
449
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 1600 } else if (f->use32bit) {
450 800 uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0],
451 800 p->data[1] + ps * x + y * p->linesize[1],
452 800 p->data[2] + ps * x + y * p->linesize[2] };
453
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 800 if (f->transparency)
454 ✗ planes[3] = p->data[3] + ps * x + y * p->linesize[3];
455 800 decode_rgb_frame32(f, sc, &gb, planes, width, height, p->linesize);
456 } else {
457 800 uint8_t *planes[4] = { p->data[0] + ps * x + y * p->linesize[0] };
458
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 800 if (f->avctx->bits_per_raw_sample > 8) {
459 ✗ planes[1] = p->data[1] + ps * x + y * p->linesize[1];
460 ✗ planes[2] = p->data[2] + ps * x + y * p->linesize[2];
461 ✗ if (f->transparency)
462 ✗ planes[3] = p->data[3] + ps * x + y * p->linesize[3];
463 }
464 800 decode_rgb_frame(f, sc, &gb, planes, width, height, p->linesize);
465 }
466
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 7700 if (ac != AC_GOLOMB_RICE && f->version > 2) {
467 int v;
468 4000 get_rac(&sc->c, (uint8_t[]) { 129 });
469
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 4000 v = sc->c.bytestream_end - sc->c.bytestream - 2 - 5*!!f->ec;
470
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 4000 if (v) {
471 ✗ av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v);
472 ✗ slice_set_damaged(f, sc);
473 }
474 }
475
476
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 7700 if (sc->slice_damaged && (f->avctx->err_recognition & AV_EF_EXPLODE))
477 ✗ return AVERROR_INVALIDDATA;
478
479
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 7700 if ((c->active_thread_type & FF_THREAD_FRAME) && !f->frame_damaged)
480 ✗ ff_progress_frame_report(&f->picture, si);
481
482 7700 return 0;
483 }
484
485 87 static enum AVPixelFormat get_pixel_format(FFV1Context *f)
486 {
487 87 enum AVPixelFormat pix_fmts[] = {
488 #if CONFIG_FFV1_VULKAN_HWACCEL
489 AV_PIX_FMT_VULKAN,
490 #endif
491 87 f->pix_fmt,
492 AV_PIX_FMT_NONE,
493 };
494
495 87 return ff_get_format(f->avctx, pix_fmts);
496 }
497
498 253 static int read_header(FFV1Context *f, RangeCoder *c)
499 {
500 uint8_t state[CONTEXT_SIZE];
501 253 int context_count = -1; //-1 to avoid warning
502 int ret;
503
504 253 memset(state, 128, sizeof(state));
505
506 253 ret = ff_ffv1_parse_header(f, c, state);
507
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 253 if (ret < 0)
508 ✗ return ret;
509
510
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 253 if (f->configured_pix_fmt != f->pix_fmt) {
511 87 f->avctx->pix_fmt = get_pixel_format(f);
512
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 87 if (f->avctx->pix_fmt < 0)
513 ✗ return AVERROR(EINVAL);
514 87 f->configured_pix_fmt = f->pix_fmt;
515 }
516
517 ff_dlog(f->avctx, "%d %d %d\n",
518 f->chroma_h_shift, f->chroma_v_shift, f->pix_fmt);
519
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 253 if (f->version < 2) {
520 24 context_count = ff_ffv1_read_quant_tables(c, f->quant_tables[0]);
521
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 24 if (context_count < 0) {
522 ✗ av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
523 ✗ return AVERROR_INVALIDDATA;
524 }
525 24 f->slice_count = f->max_slice_count;
526
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 229 } else if (f->version < 3) {
527 24 f->slice_count = ff_ffv1_get_symbol(c, state, 0);
528 } else {
529 205 const uint8_t *p = c->bytestream_end;
530 205 for (f->slice_count = 0;
531
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 1035 f->slice_count < MAX_SLICES && 3 + 5*!!f->ec < p - c->bytestream_start;
532 830 f->slice_count++) {
533
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 830 int trailer = 3 + 5*!!f->ec;
534 830 int size = AV_RB24(p-trailer);
535
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 830 if (size + trailer > p - c->bytestream_start)
536 ✗ break;
537 830 p -= size + trailer;
538 }
539 }
540
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 253 if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0 || f->slice_count > f->max_slice_count) {
541 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid (max=%d)\n", f->slice_count, f->max_slice_count);
542 ✗ return AVERROR_INVALIDDATA;
543 }
544
545 253 av_refstruct_unref(&f->slice_damaged);
546 253 f->slice_damaged = av_refstruct_allocz(f->slice_count * sizeof(*f->slice_damaged));
547
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 253 if (!f->slice_damaged)
548 ✗ return AVERROR(ENOMEM);
549
550
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 1203 for (int j = 0; j < f->slice_count; j++) {
551 950 FFV1SliceContext *sc = &f->slices[j];
552
553
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 950 if (f->version == 2) {
554 96 int sx = ff_ffv1_get_symbol(c, state, 0);
555 96 int sy = ff_ffv1_get_symbol(c, state, 0);
556 96 int sw = ff_ffv1_get_symbol(c, state, 0) + 1U;
557 96 int sh = ff_ffv1_get_symbol(c, state, 0) + 1U;
558
559
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 96 if (sx < 0 || sy < 0 || sw <= 0 || sh <= 0)
560 ✗ return AVERROR_INVALIDDATA;
561
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 96 if (sx > f->num_h_slices - sw || sy > f->num_v_slices - sh)
562 ✗ return AVERROR_INVALIDDATA;
563
564 96 sc->slice_x = sx * (int64_t)f->width / f->num_h_slices;
565 96 sc->slice_y = sy * (int64_t)f->height / f->num_v_slices;
566 96 sc->slice_width = (sx + sw) * (int64_t)f->width / f->num_h_slices - sc->slice_x;
567 96 sc->slice_height = (sy + sh) * (int64_t)f->height / f->num_v_slices - sc->slice_y;
568
569
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 96 av_assert0((unsigned)sc->slice_width <= f->width &&
570 (unsigned)sc->slice_height <= f->height);
571
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 96 av_assert0 ( (unsigned)sc->slice_x + (uint64_t)sc->slice_width <= f->width
572 && (unsigned)sc->slice_y + (uint64_t)sc->slice_height <= f->height);
573 }
574
575 950 av_refstruct_unref(&sc->plane);
576 950 sc->plane = ff_ffv1_planes_alloc();
577
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 950 if (!sc->plane)
578 ✗ return AVERROR(ENOMEM);
579
580
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 2850 for (int i = 0; i < f->plane_count; i++) {
581 1900 PlaneContext *const p = &sc->plane[i];
582
583
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 1900 if (f->version == 2) {
584 192 int idx = ff_ffv1_get_symbol(c, state, 0);
585
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 192 if (idx >= (unsigned)f->quant_table_count) {
586 ✗ av_log(f->avctx, AV_LOG_ERROR,
587 "quant_table_index out of range\n");
588 ✗ return AVERROR_INVALIDDATA;
589 }
590 192 p->quant_table_index = idx;
591 192 context_count = f->context_count[idx];
592 }
593
594
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 1900 if (f->version <= 2) {
595
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 240 av_assert0(context_count >= 0);
596 240 p->context_count = context_count;
597 }
598 }
599 }
600 253 return 0;
601 }
602
603 88 static av_cold int decode_init(AVCodecContext *avctx)
604 {
605 88 FFV1Context *f = avctx->priv_data;
606 int ret;
607
608 88 f->pix_fmt = AV_PIX_FMT_NONE;
609 88 f->configured_pix_fmt = AV_PIX_FMT_NONE;
610
611
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 88 if ((ret = ff_ffv1_common_init(avctx, f)) < 0)
612 ✗ return ret;
613
614
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 88 if (avctx->extradata_size > 0 && (ret = ff_ffv1_read_extra_header(f)) < 0)
615 ✗ return ret;
616
617
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 88 if ((ret = ff_ffv1_init_slice_contexts(f)) < 0)
618 ✗ return ret;
619
620 88 return 0;
621 }
622
623 7700 static int find_next_slice(AVCodecContext *avctx,
624 uint8_t *buf, uint8_t *buf_end, int idx,
625 uint8_t **pos, uint32_t *len)
626 {
627 7700 FFV1Context *f = avctx->priv_data;
628
629 /* Length field */
630 7700 uint32_t v = buf_end - buf;
631
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 7700 if (idx || f->version > 2) {
632 /* Three bytes of length, plus flush bit + CRC */
633
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 7300 uint32_t trailer = 3 + 5*!!f->ec;
634
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 7300 if (trailer > buf_end - buf)
635 ✗ v = INT_MAX;
636 else
637 7300 v = AV_RB24(buf_end - trailer) + trailer;
638 }
639
640
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 7700 if (buf_end - buf < v) {
641 ✗ av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
642 ✗ ff_progress_frame_report(&f->picture, INT_MAX);
643 ✗ return AVERROR_INVALIDDATA;
644 }
645
646 7700 *len = v;
647
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 7700 if (idx)
648 5625 *pos = buf_end - v;
649 else
650 2075 *pos = buf;
651
652 7700 return 0;
653 }
654
655 2120 static int decode_header(AVCodecContext *avctx, RangeCoder *c,
656 uint8_t *buf, size_t buf_size)
657 {
658 int ret;
659 2120 FFV1Context *f = avctx->priv_data;
660
661 2120 uint8_t keystate = 128;
662 2120 ff_init_range_decoder(c, buf, buf_size);
663 2120 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
664
665
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 2120 if (get_rac(c, &keystate)) {
666 253 f->key_frame = AV_FRAME_FLAG_KEY;
667 253 f->key_frame_ok = 0;
668
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 253 if ((ret = read_header(f, c)) < 0)
669 ✗ return ret;
670 253 f->key_frame_ok = 1;
671 } else {
672
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 1867 if (!f->key_frame_ok) {
673 ✗ av_log(avctx, AV_LOG_ERROR,
674 "Cannot decode non-keyframe without valid keyframe\n");
675 ✗ return AVERROR_INVALIDDATA;
676 }
677 1867 f->key_frame = 0;
678 }
679
680
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 2120 if (f->ac != AC_GOLOMB_RICE) {
681
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 1022 if (buf_size < avctx->width * avctx->height / (128*8))
682 ✗ return AVERROR_INVALIDDATA;
683 } else {
684 1098 int w = avctx->width;
685 1098 int s = 1 + w / (1<<23);
686 int i;
687
688 1098 w /= s;
689
690
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 26330 for (i = 0; w > (1<<ff_log2_run[i]); i++)
691 25232 w -= ff_log2_run[i];
692
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 1098 if (buf_size < (avctx->height + i + 6) / 8 * s)
693 ✗ return AVERROR_INVALIDDATA;
694 }
695
696 2120 return 0;
697 }
698
699 2075 static int decode_slices(AVCodecContext *avctx, RangeCoder c,
700 AVPacket *avpkt)
701 {
702 2075 FFV1Context *f = avctx->priv_data;
703 2075 AVFrame *p = f->picture.f;
704
705 2075 uint8_t *buf = avpkt->data;
706 2075 size_t buf_size = avpkt->size;
707 2075 uint8_t *buf_end = buf + buf_size;
708
709
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 9775 for (int i = f->slice_count - 1; i >= 0; i--) {
710 7700 FFV1SliceContext *sc = &f->slices[i];
711
712 uint8_t *pos;
713 uint32_t len;
714 7700 int err = find_next_slice(avctx, buf, buf_end, i,
715 &pos, &len);
716
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 7700 if (err < 0)
717 ✗ return err;
718
719 7700 buf_end -= len;
720
721 7700 sc->slice_damaged = 0;
722
723
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 7700 if (f->ec) {
724 6700 unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), f->crcref, pos, len);
725
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 6700 if (crc != f->crcref) {
726 ✗ int64_t ts = avpkt->pts != AV_NOPTS_VALUE ? avpkt->pts : avpkt->dts;
727 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice CRC mismatch %X!", crc);
728 ✗ if (ts != AV_NOPTS_VALUE && avctx->pkt_timebase.num) {
729 ✗ av_log(f->avctx, AV_LOG_ERROR, "at %f seconds\n", ts*av_q2d(avctx->pkt_timebase));
730 ✗ } else if (ts != AV_NOPTS_VALUE) {
731 ✗ av_log(f->avctx, AV_LOG_ERROR, "at %"PRId64"\n", ts);
732 } else {
733 ✗ av_log(f->avctx, AV_LOG_ERROR, "\n");
734 }
735 ✗ slice_set_damaged(f, sc);
736 }
737
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 6700 if (avctx->debug & FF_DEBUG_PICT_INFO) {
738 ✗ av_log(avctx, AV_LOG_DEBUG, "slice %d, CRC: 0x%08"PRIX32"\n", i, AV_RB32(pos + len - 4));
739 }
740 }
741
742
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 7700 if (i) {
743 5625 ff_init_range_decoder(&sc->c, pos, len);
744 5625 ff_build_rac_states(&sc->c, 0.05 * (1LL << 32), 256 - 8);
745 } else {
746 2075 sc->c = c;
747 2075 sc->c.bytestream_end = pos + len;
748 }
749 }
750
751 2075 avctx->execute(avctx,
752 decode_slice,
753 2075 f->slices,
754 NULL,
755 f->slice_count,
756 sizeof(*f->slices));
757
758
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 9775 for (int i = f->slice_count - 1; i >= 0; i--) {
759 7700 FFV1SliceContext *sc = &f->slices[i];
760
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 7700 if (sc->slice_damaged && f->last_picture.f) {
761 ✗ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(f->pix_fmt);
762 const uint8_t *src[4];
763 uint8_t *dst[4];
764 ✗ ff_progress_frame_await(&f->last_picture, INT_MAX);
765 ✗ for (int j = 0; j < desc->nb_components; j++) {
766 ✗ int pixshift = desc->comp[j].depth > 8;
767 ✗ int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;
768 ✗ int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;
769 ✗ dst[j] = p->data[j] + p->linesize[j] *
770 ✗ (sc->slice_y >> sv) + ((sc->slice_x >> sh) << pixshift);
771 ✗ src[j] = f->last_picture.f->data[j] + f->last_picture.f->linesize[j] *
772 ✗ (sc->slice_y >> sv) + ((sc->slice_x >> sh) << pixshift);
773
774 }
775
776 ✗ av_image_copy(dst, p->linesize, src,
777 ✗ f->last_picture.f->linesize,
778 f->pix_fmt,
779 sc->slice_width,
780 sc->slice_height);
781
782 ✗ f->slice_damaged[i] = 1;
783 }
784 }
785
786 2075 return 0;
787 }
788
789 2120 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
790 int *got_frame, AVPacket *avpkt)
791 {
792 2120 FFV1Context *f = avctx->priv_data;
793 int ret;
794 AVFrame *p;
795 2120 const FFHWAccel *hwaccel = NULL;
796
797 /* This is copied onto the first slice's range coder context */
798 RangeCoder c;
799
800 2120 ff_progress_frame_unref(&f->last_picture);
801 2120 av_refstruct_unref(&f->hwaccel_last_picture_private);
802
803 2120 FFSWAP(ProgressFrame, f->picture, f->last_picture);
804 2120 FFSWAP(void *, f->hwaccel_picture_private, f->hwaccel_last_picture_private);
805
806 2120 f->avctx = avctx;
807 2120 f->frame_damaged = 0;
808
809 2120 ret = decode_header(avctx, &c, avpkt->data, avpkt->size);
810
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 2120 if (ret < 0)
811 ✗ return ret;
812
813
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 2120 if (avctx->debug & FF_DEBUG_PICT_INFO)
814 ✗ av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
815 ✗ f->version, !!f->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);
816
817
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 2120 if (avctx->skip_frame >= AVDISCARD_ALL)
818 45 return avpkt->size;
819
820
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 2075 if (avctx->hwaccel)
821 ✗ hwaccel = ffhwaccel(avctx->hwaccel);
822
823 2075 ret = ff_progress_frame_get_buffer(avctx, &f->picture,
824 AV_GET_BUFFER_FLAG_REF);
825
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 2075 if (ret < 0)
826 ✗ return ret;
827
828 2075 ret = ff_hwaccel_frame_priv_alloc(avctx, &f->hwaccel_picture_private);
829
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 2075 if (ret < 0)
830 ✗ return ret;
831
832 2075 p = f->picture.f;
833
834 2075 p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P
835 2075 p->flags = (p->flags & ~AV_FRAME_FLAG_KEY) | f->key_frame;
836
837
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 2075 if (f->version < 3 && avctx->field_order > AV_FIELD_PROGRESSIVE) {
838 /* we have interlaced material flagged in container */
839 ✗ p->flags |= AV_FRAME_FLAG_INTERLACED;
840 ✗ if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)
841 ✗ p->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
842 }
843
844 /* Start */
845
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 2075 if (hwaccel) {
846 ✗ ret = hwaccel->start_frame(avctx, avpkt->buf, avpkt->data, avpkt->size);
847 ✗ if (ret < 0)
848 ✗ return ret;
849 }
850
851 2075 ff_thread_finish_setup(avctx);
852
853 /* Decode slices */
854
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 2075 if (hwaccel) {
855 ✗ uint8_t *buf_end = avpkt->data + avpkt->size;
856
857 ✗ if (!(p->flags & AV_FRAME_FLAG_KEY) && f->last_picture.f)
858 ✗ ff_progress_frame_await(&f->last_picture, f->slice_count - 1);
859
860 ✗ for (int i = f->slice_count - 1; i >= 0; i--) {
861 uint8_t *pos;
862 uint32_t len;
863 ✗ ret = find_next_slice(avctx, avpkt->data, buf_end, i,
864 &pos, &len);
865 ✗ if (ret < 0)
866 ✗ return ret;
867
868 ✗ buf_end -= len;
869
870 ✗ ret = hwaccel->decode_slice(avctx, pos, len);
871 ✗ if (ret < 0)
872 ✗ return ret;
873 }
874 } else {
875 2075 ret = decode_slices(avctx, c, avpkt);
876
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 2075 if (ret < 0)
877 ✗ return ret;
878 }
879
880 /* Finalize */
881
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 2075 if (hwaccel) {
882 ✗ ret = hwaccel->end_frame(avctx);
883 ✗ if (ret < 0)
884 ✗ return ret;
885 }
886
887 2075 ff_progress_frame_report(&f->picture, INT_MAX);
888
889 2075 ff_progress_frame_unref(&f->last_picture);
890 2075 av_refstruct_unref(&f->hwaccel_last_picture_private);
891
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 2075 if ((ret = av_frame_ref(rframe, f->picture.f)) < 0)
892 ✗ return ret;
893
894 2075 *got_frame = 1;
895
896 2075 return avpkt->size;
897 }
898
899 #if HAVE_THREADS
900 ✗ static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
901 {
902 ✗ FFV1Context *fsrc = src->priv_data;
903 ✗ FFV1Context *fdst = dst->priv_data;
904
905 ✗ if (dst == src)
906 ✗ return 0;
907
908 ✗ fdst->version = fsrc->version;
909 ✗ fdst->micro_version = fsrc->micro_version;
910 ✗ fdst->combined_version = fsrc->combined_version;
911 ✗ fdst->chroma_planes = fsrc->chroma_planes;
912 ✗ fdst->chroma_h_shift = fsrc->chroma_h_shift;
913 ✗ fdst->chroma_v_shift = fsrc->chroma_v_shift;
914 ✗ fdst->transparency = fsrc->transparency;
915 ✗ fdst->plane_count = fsrc->plane_count;
916 ✗ fdst->ac = fsrc->ac;
917 ✗ fdst->colorspace = fsrc->colorspace;
918 ✗ fdst->pix_fmt = fsrc->pix_fmt;
919 ✗ fdst->configured_pix_fmt = fsrc->configured_pix_fmt;
920
921 ✗ fdst->ec = fsrc->ec;
922 ✗ fdst->intra = fsrc->intra;
923 ✗ fdst->key_frame_ok = fsrc->key_frame_ok;
924
925 ✗ fdst->packed_at_lsb = fsrc->packed_at_lsb;
926 ✗ fdst->slice_count = fsrc->slice_count;
927 ✗ fdst->use32bit = fsrc->use32bit;
928 ✗ memcpy(fdst->state_transition, fsrc->state_transition,
929 sizeof(fdst->state_transition));
930
931 // in version 1 there is a single per-keyframe quant table, so
932 // we need to propagate it between threads
933 ✗ if (fsrc->version < 2)
934 ✗ memcpy(fdst->quant_tables[0], fsrc->quant_tables[0], sizeof(fsrc->quant_tables[0]));
935
936 ✗ for (int i = 0; i < fdst->num_h_slices * fdst->num_v_slices; i++) {
937 ✗ FFV1SliceContext *sc = &fdst->slices[i];
938 ✗ const FFV1SliceContext *sc0 = &fsrc->slices[i];
939
940 ✗ av_refstruct_replace(&sc->plane, sc0->plane);
941
942 ✗ if (fsrc->version < 3) {
943 ✗ sc->slice_x = sc0->slice_x;
944 ✗ sc->slice_y = sc0->slice_y;
945 ✗ sc->slice_width = sc0->slice_width;
946 ✗ sc->slice_height = sc0->slice_height;
947 }
948 }
949
950 ✗ av_refstruct_replace(&fdst->slice_damaged, fsrc->slice_damaged);
951
952 av_assert1(fdst->max_slice_count == fsrc->max_slice_count);
953
954 ✗ ff_progress_frame_replace(&fdst->picture, &fsrc->picture);
955 ✗ av_refstruct_replace(&fdst->hwaccel_picture_private,
956 ✗ fsrc->hwaccel_picture_private);
957
958 ✗ return 0;
959 }
960 #endif
961
962 88 static av_cold int ffv1_decode_close(AVCodecContext *avctx)
963 {
964 88 FFV1Context *const s = avctx->priv_data;
965
966 88 ff_progress_frame_unref(&s->picture);
967 88 av_refstruct_unref(&s->hwaccel_picture_private);
968
969 88 ff_progress_frame_unref(&s->last_picture);
970 88 av_refstruct_unref(&s->hwaccel_last_picture_private);
971
972 88 ff_ffv1_close(s);
973
974 88 return 0;
975 }
976
977 const FFCodec ff_ffv1_decoder = {
978 .p.name = "ffv1",
979 CODEC_LONG_NAME("FFmpeg video codec #1"),
980 .p.type = AVMEDIA_TYPE_VIDEO,
981 .p.id = AV_CODEC_ID_FFV1,
982 .priv_data_size = sizeof(FFV1Context),
983 .init = decode_init,
984 .close = ffv1_decode_close,
985 FF_CODEC_DECODE_CB(decode_frame),
986 UPDATE_THREAD_CONTEXT(update_thread_context),
987 .p.capabilities = AV_CODEC_CAP_DR1 |
988 AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,
989 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
990 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
991 FF_CODEC_CAP_USES_PROGRESSFRAMES,
992 .hw_configs = (const AVCodecHWConfigInternal *const []) {
993 #if CONFIG_FFV1_VULKAN_HWACCEL
994 HWACCEL_VULKAN(ffv1),
995 #endif
996 NULL
997 },
998 };
999