FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/setpts.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 102 120 85.0%
Functions: 8 9 88.9%
Branches: 48 75 64.0%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2010 Stefano Sabatini
3 * Copyright (c) 2008 Victor Paesa
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * video presentation timestamp (PTS) modification filter
25 */
26
27 #include "config_components.h"
28
29 #include <inttypes.h>
30
31 #include "libavutil/eval.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/time.h"
36 #include "audio.h"
37 #include "avfilter.h"
38 #include "filters.h"
39 #include "video.h"
40
41 static const char *const var_names[] = {
42 "FRAME_RATE", ///< defined only for constant frame-rate video
43 "INTERLACED", ///< tell if the current frame is interlaced
44 "N", ///< frame / sample number (starting at zero)
45 "NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
46 "NB_SAMPLES", ///< number of samples in the current frame (only audio)
47 #if FF_API_FRAME_PKT
48 "POS", ///< original position in the file of the frame
49 #endif
50 "PREV_INPTS", ///< previous input PTS
51 "PREV_INT", ///< previous input time in seconds
52 "PREV_OUTPTS", ///< previous output PTS
53 "PREV_OUTT", ///< previous output time in seconds
54 "PTS", ///< original pts in the file of the frame
55 "SAMPLE_RATE", ///< sample rate (only audio)
56 "STARTPTS", ///< PTS at start of movie
57 "STARTT", ///< time at start of movie
58 "T", ///< original time in the file of the frame
59 "TB", ///< timebase
60 "RTCTIME", ///< wallclock (RTC) time in micro seconds
61 "RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
62 "S", // Number of samples in the current frame
63 "SR", // Audio sample rate
64 "FR", ///< defined only for constant frame-rate video
65 "T_CHANGE", ///< time of first frame after latest command was applied
66 NULL
67 };
68
69 enum var_name {
70 VAR_FRAME_RATE,
71 VAR_INTERLACED,
72 VAR_N,
73 VAR_NB_CONSUMED_SAMPLES,
74 VAR_NB_SAMPLES,
75 #if FF_API_FRAME_PKT
76 VAR_POS,
77 #endif
78 VAR_PREV_INPTS,
79 VAR_PREV_INT,
80 VAR_PREV_OUTPTS,
81 VAR_PREV_OUTT,
82 VAR_PTS,
83 VAR_SAMPLE_RATE,
84 VAR_STARTPTS,
85 VAR_STARTT,
86 VAR_T,
87 VAR_TB,
88 VAR_RTCTIME,
89 VAR_RTCSTART,
90 VAR_S,
91 VAR_SR,
92 VAR_FR,
93 VAR_T_CHANGE,
94 VAR_VARS_NB,
95 };
96
97 typedef struct SetPTSContext {
98 const AVClass *class;
99 char *expr_str;
100 AVExpr *expr;
101 double var_values[VAR_VARS_NB];
102 enum AVMediaType type;
103 } SetPTSContext;
104
105 #define V(name_) \
106 setpts->var_values[VAR_##name_]
107
108 129 static av_cold int init(AVFilterContext *ctx)
109 {
110 129 SetPTSContext *setpts = ctx->priv;
111 int ret;
112
113
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 129 if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
114 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
115 ✗ av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
116 ✗ return ret;
117 }
118
119 129 V(N) = 0.0;
120 129 V(S) = 0.0;
121 129 V(PREV_INPTS) = NAN;
122 129 V(PREV_INT) = NAN;
123 129 V(PREV_OUTPTS) = NAN;
124 129 V(PREV_OUTT) = NAN;
125 129 V(STARTPTS) = NAN;
126 129 V(STARTT) = NAN;
127 129 V(T_CHANGE) = NAN;
128 129 return 0;
129 }
130
131 65 static int config_input(AVFilterLink *inlink)
132 {
133 65 FilterLink *l = ff_filter_link(inlink);
134 65 AVFilterContext *ctx = inlink->dst;
135 65 SetPTSContext *setpts = ctx->priv;
136
137 65 setpts->type = inlink->type;
138 65 V(TB) = av_q2d(inlink->time_base);
139 65 V(RTCSTART) = av_gettime();
140
141 65 V(SR) = V(SAMPLE_RATE) =
142
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 65 setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
143
144 65 V(FRAME_RATE) = V(FR) =
145
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 11 l->frame_rate.num && l->frame_rate.den ?
146
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 76 av_q2d(l->frame_rate) : NAN;
147
148 65 av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
149 V(TB), V(FRAME_RATE), V(SAMPLE_RATE));
150 65 return 0;
151 }
152
153 11 static int config_output_video(AVFilterLink *outlink)
154 {
155 11 FilterLink *l = ff_filter_link(outlink);
156
157 11 l->frame_rate = (AVRational){ 1, 0 };
158
159 11 return 0;
160 }
161
162 #define BUF_SIZE 64
163
164 4742 static inline char *double2int64str(char *buf, double v)
165 {
166
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 4742 if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
167 4742 else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
168 4742 return buf;
169 }
170
171 2371 static double eval_pts(SetPTSContext *setpts, AVFilterLink *inlink, AVFrame *frame, int64_t pts)
172 {
173
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 2371 if (isnan(V(STARTPTS))) {
174
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 65 V(STARTPTS) = TS2D(pts);
175
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 65 V(STARTT ) = TS2T(pts, inlink->time_base);
176 }
177
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 2371 if (isnan(V(T_CHANGE))) {
178
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 65 V(T_CHANGE) = TS2T(pts, inlink->time_base);
179 }
180
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 2371 V(PTS ) = TS2D(pts);
181
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 2371 V(T ) = TS2T(pts, inlink->time_base);
182 #if FF_API_FRAME_PKT
183 FF_DISABLE_DEPRECATION_WARNINGS
184
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 2371 V(POS ) = !frame || frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
185 FF_ENABLE_DEPRECATION_WARNINGS
186 #endif
187 2371 V(RTCTIME ) = av_gettime();
188
189
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 2371 if (frame) {
190
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 2311 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
191
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 502 V(INTERLACED) = !!(frame->flags & AV_FRAME_FLAG_INTERLACED);
192
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 1809 } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
193 1809 V(S) = frame->nb_samples;
194 1809 V(NB_SAMPLES) = frame->nb_samples;
195 }
196 }
197
198 2371 return av_expr_eval(setpts->expr, setpts->var_values, NULL);
199 }
200 #define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
201
202 2311 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
203 {
204 2311 SetPTSContext *setpts = inlink->dst->priv;
205 2311 int64_t in_pts = frame->pts;
206 double d;
207
208 2311 d = eval_pts(setpts, inlink, frame, frame->pts);
209
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 2311 frame->pts = D2TS(d);
210 2311 frame->duration = 0;
211
212 4622 av_log(inlink->dst, AV_LOG_TRACE,
213 "N:%"PRId64" PTS:%s T:%f",
214 2311 (int64_t)V(N), d2istr(V(PTS)), V(T));
215
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 2311 switch (inlink->type) {
216 502 case AVMEDIA_TYPE_VIDEO:
217 502 av_log(inlink->dst, AV_LOG_TRACE, " INTERLACED:%"PRId64,
218 502 (int64_t)V(INTERLACED));
219 502 break;
220 1809 case AVMEDIA_TYPE_AUDIO:
221 1809 av_log(inlink->dst, AV_LOG_TRACE, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
222 1809 (int64_t)V(NB_SAMPLES),
223 1809 (int64_t)V(NB_CONSUMED_SAMPLES));
224 1809 break;
225 }
226
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 2311 av_log(inlink->dst, AV_LOG_TRACE, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
227
228
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 2311 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
229 502 V(N) += 1.0;
230 } else {
231 1809 V(N) += frame->nb_samples;
232 }
233
234
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 2311 V(PREV_INPTS ) = TS2D(in_pts);
235
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 2311 V(PREV_INT ) = TS2T(in_pts, inlink->time_base);
236
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 2311 V(PREV_OUTPTS) = TS2D(frame->pts);
237
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 2311 V(PREV_OUTT) = TS2T(frame->pts, inlink->time_base);
238
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 2311 if (setpts->type == AVMEDIA_TYPE_AUDIO) {
239 1809 V(NB_CONSUMED_SAMPLES) += frame->nb_samples;
240 }
241 2311 return ff_filter_frame(inlink->dst->outputs[0], frame);
242 }
243
244 4706 static int activate(AVFilterContext *ctx)
245 {
246 4706 SetPTSContext *setpts = ctx->priv;
247 4706 AVFilterLink *inlink = ctx->inputs[0];
248 4706 AVFilterLink *outlink = ctx->outputs[0];
249 AVFrame *in;
250 int status;
251 int64_t pts;
252 int ret;
253
254
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 4706 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
255
256 4702 ret = ff_inlink_consume_frame(inlink, &in);
257
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 4702 if (ret < 0)
258 ✗ return ret;
259
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 4702 if (ret > 0)
260 2311 return filter_frame(inlink, in);
261
262
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 2391 if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
263 60 double d = eval_pts(setpts, inlink, NULL, pts);
264
265
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 180 av_log(ctx, AV_LOG_TRACE, "N:EOF PTS:%s T:%f -> PTS:%s T:%f\n",
266 120 d2istr(V(PTS)), V(T), d2istr(d), TS2T(d, inlink->time_base));
267
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 60 ff_outlink_set_status(outlink, status, D2TS(d));
268 60 return 0;
269 }
270
271
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 2331 FF_FILTER_FORWARD_WANTED(outlink, inlink);
272
273 ✗ return FFERROR_NOT_READY;
274 }
275
276 129 static av_cold void uninit(AVFilterContext *ctx)
277 {
278 129 SetPTSContext *setpts = ctx->priv;
279 129 av_expr_free(setpts->expr);
280 129 setpts->expr = NULL;
281 129 }
282
283 ✗ static int process_command(AVFilterContext *ctx, const char *cmd, const char *arg,
284 char *res, int res_len, int flags)
285 {
286 ✗ SetPTSContext *setpts = ctx->priv;
287 AVExpr *new_expr;
288 int ret;
289
290 ✗ ret = ff_filter_process_command(ctx, cmd, arg, res, res_len, flags);
291
292 ✗ if (ret < 0)
293 ✗ return ret;
294
295 ✗ if (!strcmp(cmd, "expr")) {
296 ✗ ret = av_expr_parse(&new_expr, arg, var_names, NULL, NULL, NULL, NULL, 0, ctx);
297 // Only free and replace previous expression if new one succeeds,
298 // otherwise defensively keep everything intact even if reporting an error.
299 ✗ if (ret < 0) {
300 ✗ av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", arg);
301 } else {
302 ✗ av_expr_free(setpts->expr);
303 ✗ setpts->expr = new_expr;
304 ✗ V(T_CHANGE) = NAN;
305 }
306 } else {
307 ✗ ret = AVERROR(EINVAL);
308 }
309
310 ✗ return ret;
311 }
312 #undef V
313
314 #define OFFSET(x) offsetof(SetPTSContext, x)
315 #define V AV_OPT_FLAG_VIDEO_PARAM
316 #define A AV_OPT_FLAG_AUDIO_PARAM
317 #define R AV_OPT_FLAG_RUNTIME_PARAM
318 #define F AV_OPT_FLAG_FILTERING_PARAM
319
320 #if CONFIG_SETPTS_FILTER
321 static const AVOption setpts_options[] = {
322 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = V|F|R },
323 { NULL }
324 };
325 AVFILTER_DEFINE_CLASS(setpts);
326
327 static const AVFilterPad avfilter_vf_setpts_inputs[] = {
328 {
329 .name = "default",
330 .type = AVMEDIA_TYPE_VIDEO,
331 .config_props = config_input,
332 },
333 };
334
335 static const AVFilterPad outputs_video[] = {
336 {
337 .name = "default",
338 .type = AVMEDIA_TYPE_VIDEO,
339 .config_props = config_output_video,
340 },
341 };
342
343 const AVFilter ff_vf_setpts = {
344 .name = "setpts",
345 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
346 .init = init,
347 .activate = activate,
348 .uninit = uninit,
349 .process_command = process_command,
350 .flags = AVFILTER_FLAG_METADATA_ONLY,
351
352 .priv_size = sizeof(SetPTSContext),
353 .priv_class = &setpts_class,
354
355 FILTER_INPUTS(avfilter_vf_setpts_inputs),
356 FILTER_OUTPUTS(outputs_video),
357 };
358 #endif /* CONFIG_SETPTS_FILTER */
359
360 #if CONFIG_ASETPTS_FILTER
361
362 static const AVOption asetpts_options[] = {
363 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = A|F|R },
364 { NULL }
365 };
366 AVFILTER_DEFINE_CLASS(asetpts);
367
368 static const AVFilterPad asetpts_inputs[] = {
369 {
370 .name = "default",
371 .type = AVMEDIA_TYPE_AUDIO,
372 .config_props = config_input,
373 },
374 };
375
376 const AVFilter ff_af_asetpts = {
377 .name = "asetpts",
378 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
379 .init = init,
380 .activate = activate,
381 .uninit = uninit,
382 .process_command = process_command,
383 .priv_size = sizeof(SetPTSContext),
384 .priv_class = &asetpts_class,
385 .flags = AVFILTER_FLAG_METADATA_ONLY,
386 FILTER_INPUTS(asetpts_inputs),
387 FILTER_OUTPUTS(ff_audio_default_filterpad),
388 };
389 #endif /* CONFIG_ASETPTS_FILTER */
390