FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ffv1_parse.c
Date: 2025-03-25 06:04:38
Exec Total Coverage
Lines: 153 297 51.5%
Functions: 4 4 100.0%
Branches: 118 318 37.1%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavutil/crc.h"
20 #include "libavutil/mem.h"
21 #include "libavutil/pixdesc.h"
22 #include "rangecoder.h"
23 #include "ffv1.h"
24
25 1550 static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
26 {
27 int v;
28 1550 int i = 0;
29 uint8_t state[CONTEXT_SIZE];
30
31 1550 memset(state, 128, sizeof(state));
32
33
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 7625 for (v = 0; i < 128; v++) {
34 6075 unsigned len = ff_ffv1_get_symbol(c, state, 0) + 1U;
35
36
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 6075 if (len > 128 - i || !len)
37 ✗ return AVERROR_INVALIDDATA;
38
39
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 204475 while (len--) {
40 198400 quant_table[i] = scale * v;
41 198400 i++;
42 }
43 }
44
45
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 198400 for (i = 1; i < 128; i++)
46 196850 quant_table[256 - i] = -quant_table[i];
47 1550 quant_table[128] = -quant_table[127];
48
49 1550 return 2 * v - 1;
50 }
51
52 310 int ff_ffv1_read_quant_tables(RangeCoder *c,
53 int16_t quant_table[MAX_CONTEXT_INPUTS][256])
54 {
55 int i;
56 310 int context_count = 1;
57
58
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 1860 for (i = 0; i < 5; i++) {
59 1550 int ret = read_quant_table(c, quant_table[i], context_count);
60
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 1550 if (ret < 0)
61 ✗ return ret;
62 1550 context_count *= ret;
63
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 1550 if (context_count > 32768U) {
64 ✗ return AVERROR_INVALIDDATA;
65 }
66 }
67 310 return (context_count + 1) / 2;
68 }
69
70 140 int ff_ffv1_read_extra_header(FFV1Context *f)
71 {
72 RangeCoder c;
73 uint8_t state[CONTEXT_SIZE];
74 int ret;
75 uint8_t state2[32][CONTEXT_SIZE];
76 140 unsigned crc = 0;
77
78 140 memset(state2, 128, sizeof(state2));
79 140 memset(state, 128, sizeof(state));
80
81 140 ff_init_range_decoder(&c, f->avctx->extradata, f->avctx->extradata_size);
82 140 ff_build_rac_states(&c, 0.05 * (1LL << 32), 256 - 8);
83
84 140 f->version = ff_ffv1_get_symbol(&c, state, 0);
85
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 140 if (f->version < 2) {
86 ✗ av_log(f->avctx, AV_LOG_ERROR, "Invalid version in global header\n");
87 ✗ return AVERROR_INVALIDDATA;
88 }
89
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 140 if (f->version > 4) {
90 ✗ av_log(f->avctx, AV_LOG_ERROR, "unsupported version %d\n",
91 f->version);
92 ✗ return AVERROR_PATCHWELCOME;
93 }
94 140 f->combined_version = f->version << 16;
95
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 140 if (f->version > 2) {
96 128 c.bytestream_end -= 4;
97 128 f->micro_version = ff_ffv1_get_symbol(&c, state, 0);
98
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 128 if (f->micro_version < 0 || f->micro_version > 65535)
99 ✗ return AVERROR_INVALIDDATA;
100 128 f->combined_version += f->micro_version;
101 }
102 140 f->ac = ff_ffv1_get_symbol(&c, state, 0);
103
104
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 140 if (f->ac == AC_RANGE_CUSTOM_TAB) {
105
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 16640 for (int i = 1; i < 256; i++)
106 16575 f->state_transition[i] = ff_ffv1_get_symbol(&c, state, 1) + c.one_state[i];
107 } else {
108 RangeCoder rc;
109 75 ff_build_rac_states(&rc, 0.05 * (1LL << 32), 256 - 8);
110
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 19200 for (int i = 1; i < 256; i++)
111 19125 f->state_transition[i] = rc.one_state[i];
112 }
113
114 140 f->colorspace = ff_ffv1_get_symbol(&c, state, 0); //YUV cs type
115 140 f->avctx->bits_per_raw_sample = ff_ffv1_get_symbol(&c, state, 0);
116 140 f->chroma_planes = get_rac(&c, state);
117 140 f->chroma_h_shift = ff_ffv1_get_symbol(&c, state, 0);
118 140 f->chroma_v_shift = ff_ffv1_get_symbol(&c, state, 0);
119 140 f->transparency = get_rac(&c, state);
120
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 140 f->plane_count = 1 + (f->chroma_planes || f->version<4) + f->transparency;
121 140 f->num_h_slices = 1 + ff_ffv1_get_symbol(&c, state, 0);
122 140 f->num_v_slices = 1 + ff_ffv1_get_symbol(&c, state, 0);
123
124
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 140 if (f->chroma_h_shift > 4U || f->chroma_v_shift > 4U) {
125 ✗ av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
126 f->chroma_h_shift, f->chroma_v_shift);
127 ✗ return AVERROR_INVALIDDATA;
128 }
129
130
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 140 if (f->num_h_slices > (unsigned)f->width || !f->num_h_slices ||
131
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 140 f->num_v_slices > (unsigned)f->height || !f->num_v_slices
132 ) {
133 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice count invalid\n");
134 ✗ return AVERROR_INVALIDDATA;
135 }
136
137
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 140 if (f->num_h_slices > MAX_SLICES / f->num_v_slices) {
138 ✗ av_log(f->avctx, AV_LOG_ERROR, "slice count unsupported\n");
139 ✗ return AVERROR_PATCHWELCOME;
140 }
141
142 140 f->quant_table_count = ff_ffv1_get_symbol(&c, state, 0);
143
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 140 if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES || !f->quant_table_count) {
144 ✗ av_log(f->avctx, AV_LOG_ERROR, "quant table count %d is invalid\n", f->quant_table_count);
145 ✗ f->quant_table_count = 0;
146 ✗ return AVERROR_INVALIDDATA;
147 }
148
149
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 420 for (int i = 0; i < f->quant_table_count; i++) {
150 280 f->context_count[i] = ff_ffv1_read_quant_tables(&c, f->quant_tables[i]);
151
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 280 if (f->context_count[i] < 0) {
152 ✗ av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
153 ✗ return AVERROR_INVALIDDATA;
154 }
155 }
156
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 140 if ((ret = ff_ffv1_allocate_initial_states(f)) < 0)
157 ✗ return ret;
158
159
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 420 for (int i = 0; i < f->quant_table_count; i++)
160
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 280 if (get_rac(&c, state)) {
161
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 151536 for (int j = 0; j < f->context_count[i]; j++)
162
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 4999896 for (int k = 0; k < CONTEXT_SIZE; k++) {
163
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 4848384 int pred = j ? f->initial_states[i][j - 1][k] : 128;
164 4848384 f->initial_states[i][j][k] =
165 4848384 (pred + ff_ffv1_get_symbol(&c, state2[k], 1)) & 0xFF;
166 }
167 }
168
169
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 140 if (f->version > 2) {
170 128 f->ec = ff_ffv1_get_symbol(&c, state, 0);
171
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 128 if (f->ec >= 2)
172 ✗ f->crcref = 0x7a8c4079;
173
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 128 if (f->combined_version >= 0x30003)
174 128 f->intra = ff_ffv1_get_symbol(&c, state, 0);
175
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 128 if (f->combined_version >= 0x40004)
176 ✗ f->flt = ff_ffv1_get_symbol(&c, state, 0);
177 }
178
179
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 140 if (f->version > 2) {
180 unsigned v;
181 256 v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), f->crcref,
182 128 f->avctx->extradata, f->avctx->extradata_size);
183
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 128 if (v != f->crcref || f->avctx->extradata_size < 4) {
184 ✗ av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
185 ✗ return AVERROR_INVALIDDATA;
186 }
187 128 crc = AV_RB32(f->avctx->extradata + f->avctx->extradata_size - 4);
188 }
189
190
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 140 if (f->avctx->debug & FF_DEBUG_PICT_INFO)
191 ✗ av_log(f->avctx, AV_LOG_DEBUG,
192 "global: ver:%d.%d, coder:%d, colorspace: %d bpr:%d chroma:%d(%d:%d), alpha:%d slices:%dx%d qtabs:%d ec:%d intra:%d CRC:0x%08X\n",
193 f->version, f->micro_version,
194 f->ac,
195 f->colorspace,
196 ✗ f->avctx->bits_per_raw_sample,
197 f->chroma_planes, f->chroma_h_shift, f->chroma_v_shift,
198 f->transparency,
199 f->num_h_slices, f->num_v_slices,
200 f->quant_table_count,
201 f->ec,
202 f->intra,
203 crc
204 );
205 140 return 0;
206 }
207
208 478 int ff_ffv1_parse_header(FFV1Context *f, RangeCoder *c, uint8_t *state)
209 {
210
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 478 if (f->version < 2) {
211 int chroma_planes, chroma_h_shift, chroma_v_shift, transparency, colorspace, bits_per_raw_sample;
212 50 unsigned v= ff_ffv1_get_symbol(c, state, 0);
213
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 50 if (v >= 2) {
214 ✗ av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in ver01 header\n", v);
215 ✗ return AVERROR_INVALIDDATA;
216 }
217 50 f->version = v;
218 50 f->ac = ff_ffv1_get_symbol(c, state, 0);
219
220
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 50 if (f->ac == AC_RANGE_CUSTOM_TAB) {
221 ✗ for (int i = 1; i < 256; i++) {
222 ✗ int st = ff_ffv1_get_symbol(c, state, 1) + c->one_state[i];
223 ✗ if (st < 1 || st > 255) {
224 ✗ av_log(f->avctx, AV_LOG_ERROR, "invalid state transition %d\n", st);
225 ✗ return AVERROR_INVALIDDATA;
226 }
227 ✗ f->state_transition[i] = st;
228 }
229 } else {
230 RangeCoder rc;
231 50 ff_build_rac_states(&rc, 0.05 * (1LL << 32), 256 - 8);
232
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 12800 for (int i = 1; i < 256; i++)
233 12750 f->state_transition[i] = rc.one_state[i];
234 }
235
236 50 colorspace = ff_ffv1_get_symbol(c, state, 0); //YUV cs type
237
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 50 bits_per_raw_sample = f->version > 0 ? ff_ffv1_get_symbol(c, state, 0) : f->avctx->bits_per_raw_sample;
238 50 chroma_planes = get_rac(c, state);
239 50 chroma_h_shift = ff_ffv1_get_symbol(c, state, 0);
240 50 chroma_v_shift = ff_ffv1_get_symbol(c, state, 0);
241 50 transparency = get_rac(c, state);
242
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 50 if (colorspace == 0 && f->avctx->skip_alpha)
243 ✗ transparency = 0;
244
245
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 50 if (f->plane_count) {
246
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 36 if (colorspace != f->colorspace ||
247
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248
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 36 chroma_planes != f->chroma_planes ||
249
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250
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251
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 36 transparency != f->transparency) {
252 ✗ av_log(f->avctx, AV_LOG_ERROR, "Invalid change of global parameters\n");
253 ✗ return AVERROR_INVALIDDATA;
254 }
255 }
256
257
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 50 if (chroma_h_shift > 4U || chroma_v_shift > 4U) {
258 ✗ av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
259 chroma_h_shift, chroma_v_shift);
260 ✗ return AVERROR_INVALIDDATA;
261 }
262
263 50 f->colorspace = colorspace;
264 50 f->avctx->bits_per_raw_sample = bits_per_raw_sample;
265 50 f->chroma_planes = chroma_planes;
266 50 f->chroma_h_shift = chroma_h_shift;
267 50 f->chroma_v_shift = chroma_v_shift;
268 50 f->transparency = transparency;
269
270 50 f->plane_count = 2 + f->transparency;
271 }
272
273
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 478 if (f->colorspace == 0) {
274
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 390 if (!f->transparency && !f->chroma_planes) {
275 ✗ if (f->avctx->bits_per_raw_sample <= 8)
276 ✗ f->pix_fmt = AV_PIX_FMT_GRAY8;
277 ✗ else if (f->avctx->bits_per_raw_sample == 9) {
278 ✗ f->packed_at_lsb = 1;
279 ✗ f->pix_fmt = AV_PIX_FMT_GRAY9;
280 ✗ } else if (f->avctx->bits_per_raw_sample == 10) {
281 ✗ f->packed_at_lsb = 1;
282 ✗ f->pix_fmt = AV_PIX_FMT_GRAY10;
283 ✗ } else if (f->avctx->bits_per_raw_sample == 12) {
284 ✗ f->packed_at_lsb = 1;
285 ✗ f->pix_fmt = AV_PIX_FMT_GRAY12;
286 ✗ } else if (f->avctx->bits_per_raw_sample == 14) {
287 ✗ f->packed_at_lsb = 1;
288 ✗ f->pix_fmt = AV_PIX_FMT_GRAY14;
289 ✗ } else if (f->avctx->bits_per_raw_sample == 16) {
290 ✗ f->packed_at_lsb = 1;
291 ✗ if (f->flt) {
292 ✗ f->pix_fmt = AV_PIX_FMT_GRAYF16;
293 } else
294 ✗ f->pix_fmt = AV_PIX_FMT_GRAY16;
295 ✗ } else if (f->avctx->bits_per_raw_sample < 16) {
296 ✗ f->pix_fmt = AV_PIX_FMT_GRAY16;
297 } else
298 ✗ return AVERROR(ENOSYS);
299
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 390 } else if (f->transparency && !f->chroma_planes) {
300 ✗ if (f->avctx->bits_per_raw_sample <= 8 && !f->flt) {
301 ✗ f->pix_fmt = AV_PIX_FMT_YA8;
302 ✗ } else if (f->avctx->bits_per_raw_sample == 16 && f->flt) {
303 ✗ f->pix_fmt = AV_PIX_FMT_YAF16;
304 } else
305 ✗ return AVERROR(ENOSYS);
306
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 390 } else if (f->avctx->bits_per_raw_sample<=8 && !f->transparency) {
307
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 254 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
308 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P; break;
309 ✗ case 0x01: f->pix_fmt = AV_PIX_FMT_YUV440P; break;
310 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P; break;
311 254 case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P; break;
312 ✗ case 0x20: f->pix_fmt = AV_PIX_FMT_YUV411P; break;
313 ✗ case 0x22: f->pix_fmt = AV_PIX_FMT_YUV410P; break;
314 }
315
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 136 } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {
316 ✗ switch(16*f->chroma_h_shift + f->chroma_v_shift) {
317 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P; break;
318 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P; break;
319 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P; break;
320 }
321
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 136 } else if (f->avctx->bits_per_raw_sample == 9 && !f->transparency) {
322 ✗ f->packed_at_lsb = 1;
323 ✗ switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
324 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P9; break;
325 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P9; break;
326 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P9; break;
327 }
328
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 136 } else if (f->avctx->bits_per_raw_sample == 9 && f->transparency) {
329 ✗ f->packed_at_lsb = 1;
330 ✗ switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
331 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P9; break;
332 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P9; break;
333 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P9; break;
334 }
335
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 136 } else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency) {
336 92 f->packed_at_lsb = 1;
337
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 92 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
338 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P10; break;
339 ✗ case 0x01: f->pix_fmt = AV_PIX_FMT_YUV440P10; break;
340 92 case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P10; break;
341 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P10; break;
342 }
343
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 44 } else if (f->avctx->bits_per_raw_sample == 10 && f->transparency) {
344 ✗ f->packed_at_lsb = 1;
345 ✗ switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
346 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P10; break;
347 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P10; break;
348 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P10; break;
349 }
350
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 44 } else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency) {
351 ✗ f->packed_at_lsb = 1;
352 ✗ switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
353 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P12; break;
354 ✗ case 0x01: f->pix_fmt = AV_PIX_FMT_YUV440P12; break;
355 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P12; break;
356 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P12; break;
357 }
358
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 44 } else if (f->avctx->bits_per_raw_sample == 12 && f->transparency) {
359 ✗ f->packed_at_lsb = 1;
360 ✗ switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
361 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P12; break;
362 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P12; break;
363 }
364
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 44 } else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency) {
365 ✗ f->packed_at_lsb = 1;
366 ✗ switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
367 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P14; break;
368 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P14; break;
369 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P14; break;
370 }
371
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 44 } else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency){
372 44 f->packed_at_lsb = 1;
373
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 44 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
374 44 case 0x00: f->pix_fmt = AV_PIX_FMT_YUV444P16; break;
375 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUV422P16; break;
376 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUV420P16; break;
377 }
378 ✗ } else if (f->avctx->bits_per_raw_sample == 16 && f->transparency){
379 ✗ f->packed_at_lsb = 1;
380 ✗ switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
381 ✗ case 0x00: f->pix_fmt = AV_PIX_FMT_YUVA444P16; break;
382 ✗ case 0x10: f->pix_fmt = AV_PIX_FMT_YUVA422P16; break;
383 ✗ case 0x11: f->pix_fmt = AV_PIX_FMT_YUVA420P16; break;
384 }
385 }
386
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 88 } else if (f->colorspace == 1) {
387
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 88 if (f->chroma_h_shift || f->chroma_v_shift) {
388 ✗ av_log(f->avctx, AV_LOG_ERROR,
389 "chroma subsampling not supported in this colorspace\n");
390 ✗ return AVERROR(ENOSYS);
391 }
392
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 88 if ( f->avctx->bits_per_raw_sample <= 8 && !f->transparency)
393 44 f->pix_fmt = AV_PIX_FMT_0RGB32;
394
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 44 else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency)
395 ✗ f->pix_fmt = AV_PIX_FMT_RGB32;
396
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 44 else if (f->avctx->bits_per_raw_sample == 9 && !f->transparency)
397 ✗ f->pix_fmt = AV_PIX_FMT_GBRP9;
398
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 44 else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency)
399 ✗ f->pix_fmt = AV_PIX_FMT_GBRP10;
400
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 44 else if (f->avctx->bits_per_raw_sample == 10 && f->transparency)
401 ✗ f->pix_fmt = AV_PIX_FMT_GBRAP10;
402
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 44 else if (f->avctx->bits_per_raw_sample == 12 && !f->transparency)
403 ✗ f->pix_fmt = AV_PIX_FMT_GBRP12;
404
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 44 else if (f->avctx->bits_per_raw_sample == 12 && f->transparency)
405 ✗ f->pix_fmt = AV_PIX_FMT_GBRAP12;
406
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 44 else if (f->avctx->bits_per_raw_sample == 14 && !f->transparency)
407 ✗ f->pix_fmt = AV_PIX_FMT_GBRP14;
408
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 44 else if (f->avctx->bits_per_raw_sample == 14 && f->transparency)
409 ✗ f->pix_fmt = AV_PIX_FMT_GBRAP14;
410
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 44 else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency) {
411
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 44 if (f->flt) {
412 ✗ f->pix_fmt = AV_PIX_FMT_GBRPF16;
413 } else
414 44 f->pix_fmt = AV_PIX_FMT_GBRP16;
415 44 f->use32bit = 1;
416 ✗ } else if (f->avctx->bits_per_raw_sample == 16 && f->transparency) {
417 ✗ if (f->flt) {
418 ✗ f->pix_fmt = AV_PIX_FMT_GBRAPF16;
419 } else
420 ✗ f->pix_fmt = AV_PIX_FMT_GBRAP16;
421 ✗ f->use32bit = 1;
422 ✗ } else if (f->avctx->bits_per_raw_sample == 32 && !f->transparency) {
423 ✗ if (f->flt) {
424 ✗ f->pix_fmt = AV_PIX_FMT_GBRPF32;
425 }
426 ✗ f->use32bit = 1;
427 ✗ } else if (f->avctx->bits_per_raw_sample == 32 && f->transparency) {
428 ✗ if (f->flt) {
429 ✗ f->pix_fmt = AV_PIX_FMT_GBRAPF32;
430 }
431 ✗ f->use32bit = 1;
432 }
433 } else {
434 ✗ av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
435 ✗ return AVERROR(ENOSYS);
436 }
437
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 478 if (f->pix_fmt == AV_PIX_FMT_NONE) {
438 ✗ av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
439 ✗ return AVERROR(ENOSYS);
440 }
441
442 478 return 0;
443 }
444