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path: root/libavfilter/setpts.c (plain)
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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 <inttypes.h>
28
29#include "libavutil/eval.h"
30#include "libavutil/internal.h"
31#include "libavutil/mathematics.h"
32#include "libavutil/opt.h"
33#include "libavutil/time.h"
34#include "audio.h"
35#include "avfilter.h"
36#include "internal.h"
37#include "video.h"
38
39static const char *const var_names[] = {
40 "FRAME_RATE", ///< defined only for constant frame-rate video
41 "INTERLACED", ///< tell if the current frame is interlaced
42 "N", ///< frame / sample number (starting at zero)
43 "NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
44 "NB_SAMPLES", ///< number of samples in the current frame (only audio)
45 "POS", ///< original position in the file of the frame
46 "PREV_INPTS", ///< previous input PTS
47 "PREV_INT", ///< previous input time in seconds
48 "PREV_OUTPTS", ///< previous output PTS
49 "PREV_OUTT", ///< previous output time in seconds
50 "PTS", ///< original pts in the file of the frame
51 "SAMPLE_RATE", ///< sample rate (only audio)
52 "STARTPTS", ///< PTS at start of movie
53 "STARTT", ///< time at start of movie
54 "T", ///< original time in the file of the frame
55 "TB", ///< timebase
56 "RTCTIME", ///< wallclock (RTC) time in micro seconds
57 "RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
58 "S", // Number of samples in the current frame
59 "SR", // Audio sample rate
60 NULL
61};
62
63enum var_name {
64 VAR_FRAME_RATE,
65 VAR_INTERLACED,
66 VAR_N,
67 VAR_NB_CONSUMED_SAMPLES,
68 VAR_NB_SAMPLES,
69 VAR_POS,
70 VAR_PREV_INPTS,
71 VAR_PREV_INT,
72 VAR_PREV_OUTPTS,
73 VAR_PREV_OUTT,
74 VAR_PTS,
75 VAR_SAMPLE_RATE,
76 VAR_STARTPTS,
77 VAR_STARTT,
78 VAR_T,
79 VAR_TB,
80 VAR_RTCTIME,
81 VAR_RTCSTART,
82 VAR_S,
83 VAR_SR,
84 VAR_VARS_NB
85};
86
87typedef struct SetPTSContext {
88 const AVClass *class;
89 char *expr_str;
90 AVExpr *expr;
91 double var_values[VAR_VARS_NB];
92 enum AVMediaType type;
93} SetPTSContext;
94
95static av_cold int init(AVFilterContext *ctx)
96{
97 SetPTSContext *setpts = ctx->priv;
98 int ret;
99
100 if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
101 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
102 av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
103 return ret;
104 }
105
106 setpts->var_values[VAR_N] = 0.0;
107 setpts->var_values[VAR_S] = 0.0;
108 setpts->var_values[VAR_PREV_INPTS] = NAN;
109 setpts->var_values[VAR_PREV_INT] = NAN;
110 setpts->var_values[VAR_PREV_OUTPTS] = NAN;
111 setpts->var_values[VAR_PREV_OUTT] = NAN;
112 setpts->var_values[VAR_STARTPTS] = NAN;
113 setpts->var_values[VAR_STARTT] = NAN;
114 return 0;
115}
116
117static int config_input(AVFilterLink *inlink)
118{
119 AVFilterContext *ctx = inlink->dst;
120 SetPTSContext *setpts = ctx->priv;
121
122 setpts->type = inlink->type;
123 setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
124 setpts->var_values[VAR_RTCSTART] = av_gettime();
125
126 setpts->var_values[VAR_SR] =
127 setpts->var_values[VAR_SAMPLE_RATE] =
128 setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
129
130 setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num &&
131 inlink->frame_rate.den ?
132 av_q2d(inlink->frame_rate) : NAN;
133
134 av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
135 setpts->var_values[VAR_TB],
136 setpts->var_values[VAR_FRAME_RATE],
137 setpts->var_values[VAR_SAMPLE_RATE]);
138 return 0;
139}
140
141#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
142#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
143#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
144
145#define BUF_SIZE 64
146
147static inline char *double2int64str(char *buf, double v)
148{
149 if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
150 else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
151 return buf;
152}
153
154#define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
155
156static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
157{
158 SetPTSContext *setpts = inlink->dst->priv;
159 int64_t in_pts = frame->pts;
160 double d;
161
162 if (isnan(setpts->var_values[VAR_STARTPTS])) {
163 setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
164 setpts->var_values[VAR_STARTT ] = TS2T(frame->pts, inlink->time_base);
165 }
166 setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
167 setpts->var_values[VAR_T ] = TS2T(frame->pts, inlink->time_base);
168 setpts->var_values[VAR_POS ] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);
169 setpts->var_values[VAR_RTCTIME ] = av_gettime();
170
171 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
172 setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
173 } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
174 setpts->var_values[VAR_S] = frame->nb_samples;
175 setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;
176 }
177
178 d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
179 frame->pts = D2TS(d);
180
181 av_log(inlink->dst, AV_LOG_TRACE,
182 "N:%"PRId64" PTS:%s T:%f POS:%s",
183 (int64_t)setpts->var_values[VAR_N],
184 d2istr(setpts->var_values[VAR_PTS]),
185 setpts->var_values[VAR_T],
186 d2istr(setpts->var_values[VAR_POS]));
187 switch (inlink->type) {
188 case AVMEDIA_TYPE_VIDEO:
189 av_log(inlink->dst, AV_LOG_TRACE, " INTERLACED:%"PRId64,
190 (int64_t)setpts->var_values[VAR_INTERLACED]);
191 break;
192 case AVMEDIA_TYPE_AUDIO:
193 av_log(inlink->dst, AV_LOG_TRACE, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
194 (int64_t)setpts->var_values[VAR_NB_SAMPLES],
195 (int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
196 break;
197 }
198 av_log(inlink->dst, AV_LOG_TRACE, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
199
200 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
201 setpts->var_values[VAR_N] += 1.0;
202 } else {
203 setpts->var_values[VAR_N] += frame->nb_samples;
204 }
205
206 setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
207 setpts->var_values[VAR_PREV_INT ] = TS2T(in_pts, inlink->time_base);
208 setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
209 setpts->var_values[VAR_PREV_OUTT] = TS2T(frame->pts, inlink->time_base);
210 if (setpts->type == AVMEDIA_TYPE_AUDIO) {
211 setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
212 }
213 return ff_filter_frame(inlink->dst->outputs[0], frame);
214}
215
216static av_cold void uninit(AVFilterContext *ctx)
217{
218 SetPTSContext *setpts = ctx->priv;
219 av_expr_free(setpts->expr);
220 setpts->expr = NULL;
221}
222
223#define OFFSET(x) offsetof(SetPTSContext, x)
224#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
225static const AVOption options[] = {
226 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
227 { NULL }
228};
229
230#if CONFIG_SETPTS_FILTER
231#define setpts_options options
232AVFILTER_DEFINE_CLASS(setpts);
233
234static const AVFilterPad avfilter_vf_setpts_inputs[] = {
235 {
236 .name = "default",
237 .type = AVMEDIA_TYPE_VIDEO,
238 .config_props = config_input,
239 .filter_frame = filter_frame,
240 },
241 { NULL }
242};
243
244static const AVFilterPad avfilter_vf_setpts_outputs[] = {
245 {
246 .name = "default",
247 .type = AVMEDIA_TYPE_VIDEO,
248 },
249 { NULL }
250};
251
252AVFilter ff_vf_setpts = {
253 .name = "setpts",
254 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
255 .init = init,
256 .uninit = uninit,
257
258 .priv_size = sizeof(SetPTSContext),
259 .priv_class = &setpts_class,
260
261 .inputs = avfilter_vf_setpts_inputs,
262 .outputs = avfilter_vf_setpts_outputs,
263};
264#endif /* CONFIG_SETPTS_FILTER */
265
266#if CONFIG_ASETPTS_FILTER
267
268#define asetpts_options options
269AVFILTER_DEFINE_CLASS(asetpts);
270
271static const AVFilterPad asetpts_inputs[] = {
272 {
273 .name = "default",
274 .type = AVMEDIA_TYPE_AUDIO,
275 .config_props = config_input,
276 .filter_frame = filter_frame,
277 },
278 { NULL }
279};
280
281static const AVFilterPad asetpts_outputs[] = {
282 {
283 .name = "default",
284 .type = AVMEDIA_TYPE_AUDIO,
285 },
286 { NULL }
287};
288
289AVFilter ff_af_asetpts = {
290 .name = "asetpts",
291 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
292 .init = init,
293 .uninit = uninit,
294 .priv_size = sizeof(SetPTSContext),
295 .priv_class = &asetpts_class,
296 .inputs = asetpts_inputs,
297 .outputs = asetpts_outputs,
298};
299#endif /* CONFIG_ASETPTS_FILTER */
300
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