FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/framesync.c
Date: 2025-06-23 20:06:14
Exec Total Coverage
Lines: 196 234 83.8%
Functions: 16 18 88.9%
Branches: 136 192 70.8%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2013 Nicolas George
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/avassert.h"
22 #include "libavutil/mem.h"
23 #include "libavutil/opt.h"
24 #include "avfilter.h"
25 #include "filters.h"
26 #include "framesync.h"
27
28 #define OFFSET(member) offsetof(FFFrameSync, member)
29 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
30
31 ✗ static const char *framesync_name(void *ptr)
32 {
33 ✗ return "framesync";
34 }
35
36 static const AVOption framesync_options[] = {
37 { "eof_action", "Action to take when encountering EOF from secondary input ",
38 OFFSET(opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
39 EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, .unit = "eof_action" },
40 { "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, .unit = "eof_action" },
41 { "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, .unit = "eof_action" },
42 { "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, .unit = "eof_action" },
43 { "shortest", "force termination when the shortest input terminates", OFFSET(opt_shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
44 { "repeatlast", "extend last frame of secondary streams beyond EOF", OFFSET(opt_repeatlast), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
45 { "ts_sync_mode", "How strictly to sync streams based on secondary input timestamps",
46 OFFSET(opt_ts_sync_mode), AV_OPT_TYPE_INT, { .i64 = TS_DEFAULT },
47 TS_DEFAULT, TS_NEAREST, .flags = FLAGS, .unit = "ts_sync_mode" },
48 { "default", "Frame from secondary input with the nearest lower or equal timestamp to the primary input frame",
49 0, AV_OPT_TYPE_CONST, { .i64 = TS_DEFAULT }, .flags = FLAGS, .unit = "ts_sync_mode" },
50 { "nearest", "Frame from secondary input with the absolute nearest timestamp to the primary input frame",
51 0, AV_OPT_TYPE_CONST, { .i64 = TS_NEAREST }, .flags = FLAGS, .unit = "ts_sync_mode" },
52 { NULL }
53 };
54 const AVClass ff_framesync_class = {
55 .version = LIBAVUTIL_VERSION_INT,
56 .class_name = "framesync",
57 .item_name = framesync_name,
58 .category = AV_CLASS_CATEGORY_FILTER,
59 .option = framesync_options,
60 .parent_log_context_offset = OFFSET(parent),
61 };
62
63 ✗ const AVClass *ff_framesync_child_class_iterate(void **iter)
64 {
65 ✗ const AVClass *c = *iter ? NULL : &ff_framesync_class;
66 ✗ *iter = (void *)(uintptr_t)c;
67 ✗ return c;
68 }
69
70 enum {
71 STATE_BOF,
72 STATE_RUN,
73 STATE_EOF,
74 };
75
76 static int consume_from_fifos(FFFrameSync *fs);
77
78 17436 void ff_framesync_preinit(FFFrameSync *fs)
79 {
80
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 17436 if (fs->class)
81 6499 return;
82 10937 fs->class = &ff_framesync_class;
83 10937 av_opt_set_defaults(fs);
84 }
85
86 6507 int ff_framesync_init(FFFrameSync *fs, AVFilterContext *parent, unsigned nb_in)
87 {
88 /* For filters with several outputs, we will not be able to assume which
89 output is relevant for ff_outlink_frame_wanted() and
90 ff_outlink_set_status(). To be designed when needed. */
91
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 6507 av_assert0(parent->nb_outputs == 1);
92
93 6507 ff_framesync_preinit(fs);
94 6507 fs->parent = parent;
95 6507 fs->nb_in = nb_in;
96
97 6507 fs->in = av_calloc(nb_in, sizeof(*fs->in));
98
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 6507 if (!fs->in) {
99 ✗ fs->nb_in = 0;
100 ✗ return AVERROR(ENOMEM);
101 }
102
103 6507 return 0;
104 }
105
106 2316 static void framesync_eof(FFFrameSync *fs, int64_t pts)
107 {
108 2316 fs->eof = 1;
109 2316 fs->frame_ready = 0;
110 2316 ff_outlink_set_status(fs->parent->outputs[0], AVERROR_EOF, pts);
111 2316 }
112
113 7696 static void framesync_sync_level_update(FFFrameSync *fs, int64_t eof_pts)
114 {
115 7696 unsigned i, level = 0;
116
117
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 15498 for (i = 0; i < fs->nb_in; i++)
118
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 7802 if (fs->in[i].state != STATE_EOF)
119 7802 level = FFMAX(level, fs->in[i].sync);
120
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 7696 av_assert0(level <= fs->sync_level);
121
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 7696 if (level < fs->sync_level)
122 7683 av_log(fs, AV_LOG_VERBOSE, "Sync level %u\n", level);
123
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 7696 if (fs->opt_ts_sync_mode > TS_DEFAULT) {
124 ✗ for (i = 0; i < fs->nb_in; i++) {
125 ✗ if (fs->in[i].sync < level)
126 ✗ fs->in[i].ts_mode = fs->opt_ts_sync_mode;
127 else
128 ✗ fs->in[i].ts_mode = TS_DEFAULT;
129 }
130 }
131
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 7696 if (level)
132 6538 fs->sync_level = level;
133 else
134 1158 framesync_eof(fs, eof_pts);
135 7696 }
136
137 6507 int ff_framesync_configure(FFFrameSync *fs)
138 {
139 unsigned i;
140
141
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 6507 if (!fs->opt_repeatlast || fs->opt_eof_action == EOF_ACTION_PASS) {
142 ✗ fs->opt_repeatlast = 0;
143 ✗ fs->opt_eof_action = EOF_ACTION_PASS;
144 }
145
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 6507 if (fs->opt_shortest || fs->opt_eof_action == EOF_ACTION_ENDALL) {
146 ✗ fs->opt_shortest = 1;
147 ✗ fs->opt_eof_action = EOF_ACTION_ENDALL;
148 }
149
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 6507 if (!fs->opt_repeatlast) {
150 ✗ for (i = 1; i < fs->nb_in; i++) {
151 ✗ fs->in[i].after = EXT_NULL;
152 ✗ fs->in[i].sync = 0;
153 }
154 }
155
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 6507 if (fs->opt_shortest) {
156 ✗ for (i = 0; i < fs->nb_in; i++)
157 ✗ fs->in[i].after = EXT_STOP;
158 }
159
160
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 6507 if (!fs->time_base.num) {
161
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 12945 for (i = 0; i < fs->nb_in; i++) {
162
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 6495 if (fs->in[i].sync) {
163
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 6494 if (fs->time_base.num) {
164 44 fs->time_base = av_gcd_q(fs->time_base, fs->in[i].time_base,
165 44 AV_TIME_BASE / 2, AV_TIME_BASE_Q);
166 } else {
167 6450 fs->time_base = fs->in[i].time_base;
168 }
169 }
170 }
171
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 6450 if (!fs->time_base.num) {
172 ✗ av_log(fs, AV_LOG_ERROR, "Impossible to set time base\n");
173 ✗ return AVERROR(EINVAL);
174 }
175 6450 av_log(fs, AV_LOG_VERBOSE, "Selected %d/%d time base\n",
176 fs->time_base.num, fs->time_base.den);
177 }
178
179
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 13059 for (i = 0; i < fs->nb_in; i++)
180 6552 fs->in[i].pts = fs->in[i].pts_next = AV_NOPTS_VALUE;
181 6507 fs->sync_level = UINT_MAX;
182 6507 framesync_sync_level_update(fs, AV_NOPTS_VALUE);
183
184 6507 return 0;
185 }
186
187 210717 static int framesync_advance(FFFrameSync *fs)
188 {
189 unsigned i;
190 int64_t pts;
191 int ret;
192
193
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 317954 while (!(fs->frame_ready || fs->eof)) {
194 210805 ret = consume_from_fifos(fs);
195
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 210805 if (ret <= 0)
196 103532 return ret;
197
198 107273 pts = INT64_MAX;
199
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 216061 for (i = 0; i < fs->nb_in; i++)
200
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 108788 if (fs->in[i].have_next && fs->in[i].pts_next < pts)
201 107325 pts = fs->in[i].pts_next;
202
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 107273 if (pts == INT64_MAX) {
203 36 framesync_eof(fs, AV_NOPTS_VALUE);
204 36 break;
205 }
206
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 215959 for (i = 0; i < fs->nb_in; i++) {
207
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 108722 if (fs->in[i].pts_next == pts ||
208
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 721 (fs->in[i].ts_mode == TS_NEAREST &&
209 ✗ fs->in[i].have_next &&
210 ✗ fs->in[i].pts_next != INT64_MAX && fs->in[i].pts != AV_NOPTS_VALUE &&
211 ✗ fs->in[i].pts_next - pts < pts - fs->in[i].pts) ||
212
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 721 (fs->in[i].before == EXT_INFINITY &&
213
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 280 fs->in[i].state == STATE_BOF)) {
214 108001 av_frame_free(&fs->in[i].frame);
215 108001 fs->in[i].frame = fs->in[i].frame_next;
216 108001 fs->in[i].pts = fs->in[i].pts_next;
217 108001 fs->in[i].frame_next = NULL;
218 108001 fs->in[i].pts_next = AV_NOPTS_VALUE;
219 108001 fs->in[i].have_next = 0;
220
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 108001 fs->in[i].state = fs->in[i].frame ? STATE_RUN : STATE_EOF;
221
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 108001 if (fs->in[i].sync == fs->sync_level && fs->in[i].frame)
222 106177 fs->frame_ready = 1;
223
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 108001 if (fs->in[i].state == STATE_EOF &&
224
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 1122 fs->in[i].after == EXT_STOP)
225 1122 framesync_eof(fs, AV_NOPTS_VALUE);
226 }
227 }
228
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 107237 if (fs->frame_ready)
229
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 213451 for (i = 0; i < fs->nb_in; i++)
230
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 107424 if ((fs->in[i].state == STATE_BOF &&
231
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 3 fs->in[i].before == EXT_STOP))
232 ✗ fs->frame_ready = 0;
233 107237 fs->pts = pts;
234 }
235 107185 return 0;
236 }
237
238 1122 static int64_t framesync_pts_extrapolate(FFFrameSync *fs, unsigned in,
239 int64_t pts)
240 {
241 /* Possible enhancement: use the link's frame rate */
242 1122 return pts + 1;
243 }
244
245 106879 static void framesync_inject_frame(FFFrameSync *fs, unsigned in, AVFrame *frame)
246 {
247 int64_t pts;
248
249
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 106879 av_assert0(!fs->in[in].have_next);
250
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 106879 av_assert0(frame);
251 106879 pts = av_rescale_q(frame->pts, fs->in[in].time_base, fs->time_base);
252 106879 frame->pts = pts;
253 106879 fs->in[in].frame_next = frame;
254 106879 fs->in[in].pts_next = pts;
255 106879 fs->in[in].have_next = 1;
256 106879 }
257
258 1189 static void framesync_inject_status(FFFrameSync *fs, unsigned in, int status, int64_t eof_pts)
259 {
260
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 1189 av_assert0(!fs->in[in].have_next);
261 1189 fs->in[in].sync = 0;
262
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 1189 framesync_sync_level_update(fs, status == AVERROR_EOF ? eof_pts : AV_NOPTS_VALUE);
263 1189 fs->in[in].frame_next = NULL;
264
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 1183 fs->in[in].pts_next = fs->in[in].state != STATE_RUN || fs->in[in].after == EXT_INFINITY
265
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 2372 ? INT64_MAX : framesync_pts_extrapolate(fs, in, fs->in[in].pts);
266 1189 fs->in[in].have_next = 1;
267 1189 }
268
269 107424 int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe,
270 unsigned get)
271 {
272 AVFrame *frame;
273 107424 unsigned need_copy = 0, i;
274 int64_t pts_next;
275
276
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 107424 if (!fs->in[in].frame) {
277 3 *rframe = NULL;
278 3 return 0;
279 }
280 107421 frame = fs->in[in].frame;
281
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 107421 if (get) {
282 /* Find out if we need to copy the frame: is there another sync
283 stream, and do we know if its current frame will outlast this one? */
284
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 105827 pts_next = fs->in[in].have_next ? fs->in[in].pts_next : INT64_MAX;
285
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 212901 for (i = 0; i < fs->nb_in && !need_copy; i++)
286
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 107074 if (i != in && fs->in[i].sync &&
287
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 953 (!fs->in[i].have_next || fs->in[i].pts_next < pts_next))
288 953 need_copy = 1;
289
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 105827 if (need_copy) {
290
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 953 if (!(frame = av_frame_clone(frame)))
291 ✗ return AVERROR(ENOMEM);
292 } else {
293 104874 fs->in[in].frame = NULL;
294 }
295 105827 fs->frame_ready = 0;
296 }
297 107421 *rframe = frame;
298 107421 return 0;
299 }
300
301 17409 void ff_framesync_uninit(FFFrameSync *fs)
302 {
303 unsigned i;
304
305
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 23961 for (i = 0; i < fs->nb_in; i++) {
306 6552 av_frame_free(&fs->in[i].frame);
307 6552 av_frame_free(&fs->in[i].frame_next);
308 }
309
310 17409 av_freep(&fs->in);
311 17409 }
312
313 210805 static int consume_from_fifos(FFFrameSync *fs)
314 {
315 210805 AVFilterContext *ctx = fs->parent;
316 210805 AVFrame *frame = NULL;
317 int64_t pts;
318 unsigned i, nb_active, nb_miss;
319 int ret, status;
320
321 210805 nb_active = nb_miss = 0;
322
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 425290 for (i = 0; i < fs->nb_in; i++) {
323
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 214485 if (fs->in[i].have_next || fs->in[i].state == STATE_EOF)
324 2218 continue;
325 212267 nb_active++;
326 212267 ret = ff_inlink_consume_frame(ctx->inputs[i], &frame);
327
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 212267 if (ret < 0)
328 ✗ return ret;
329
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 212267 if (ret) {
330
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 106879 av_assert0(frame);
331 106879 framesync_inject_frame(fs, i, frame);
332 } else {
333 105388 ret = ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts);
334
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 105388 if (ret > 0) {
335 1189 framesync_inject_status(fs, i, status, pts);
336
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 104199 } else if (!ret) {
337 104199 nb_miss++;
338 }
339 }
340 }
341
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 210805 if (nb_miss) {
342
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 103532 if (nb_miss == nb_active && !ff_outlink_frame_wanted(ctx->outputs[0]))
343 4 return FFERROR_NOT_READY;
344
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 209217 for (i = 0; i < fs->nb_in; i++)
345
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 105689 if (!fs->in[i].have_next && fs->in[i].state != STATE_EOF)
346 104195 ff_inlink_request_frame(ctx->inputs[i]);
347 103528 return 0;
348 }
349 107273 return 1;
350 }
351
352 211861 int ff_framesync_activate(FFFrameSync *fs)
353 {
354 211861 AVFilterContext *ctx = fs->parent;
355 int ret;
356
357
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 213010 FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
358
359 210717 ret = framesync_advance(fs);
360
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 210717 if (ret < 0)
361 4 return ret;
362
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 210713 if (fs->eof || !fs->frame_ready)
363 104686 return 0;
364 106027 ret = fs->on_event(fs);
365
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 106027 if (ret < 0)
366 ✗ return ret;
367 106027 fs->frame_ready = 0;
368
369 106027 return 0;
370 }
371
372 41 int ff_framesync_init_dualinput(FFFrameSync *fs, AVFilterContext *parent)
373 {
374 int ret;
375
376 41 ret = ff_framesync_init(fs, parent, 2);
377
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 41 if (ret < 0)
378 ✗ return ret;
379 41 fs->in[0].time_base = parent->inputs[0]->time_base;
380 41 fs->in[1].time_base = parent->inputs[1]->time_base;
381 41 fs->in[0].sync = 2;
382 41 fs->in[0].before = EXT_STOP;
383 41 fs->in[0].after = EXT_INFINITY;
384 41 fs->in[1].sync = 1;
385 41 fs->in[1].before = EXT_NULL;
386 41 fs->in[1].after = EXT_INFINITY;
387 41 return 0;
388 }
389
390 1242 int ff_framesync_dualinput_get(FFFrameSync *fs, AVFrame **f0, AVFrame **f1)
391 {
392 1242 AVFilterContext *ctx = fs->parent;
393 1242 AVFrame *mainpic = NULL, *secondpic = NULL;
394 int ret;
395
396
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 2484 if ((ret = ff_framesync_get_frame(fs, 0, &mainpic, 1)) < 0 ||
397 1242 (ret = ff_framesync_get_frame(fs, 1, &secondpic, 0)) < 0) {
398 ✗ av_frame_free(&mainpic);
399 ✗ return ret;
400 }
401
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 1242 av_assert0(mainpic);
402 1242 mainpic->pts = av_rescale_q(fs->pts, fs->time_base, ctx->outputs[0]->time_base);
403
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 1242 if (ctx->is_disabled)
404 ✗ secondpic = NULL;
405 1242 *f0 = mainpic;
406 1242 *f1 = secondpic;
407 1242 return 0;
408 }
409
410 1208 int ff_framesync_dualinput_get_writable(FFFrameSync *fs, AVFrame **f0, AVFrame **f1)
411 {
412 int ret;
413
414 1208 ret = ff_framesync_dualinput_get(fs, f0, f1);
415
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 1208 if (ret < 0)
416 ✗ return ret;
417 1208 ret = ff_inlink_make_frame_writable(fs->parent->inputs[0], f0);
418
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 1208 if (ret < 0) {
419 ✗ av_frame_free(f0);
420 ✗ *f1 = NULL;
421 ✗ return ret;
422 }
423 1208 return 0;
424 }
425