2 * Copyright (c) 2010 Stefano Sabatini
3 * Copyright (c) 2008 Victor Paesa
5 * This file is part of FFmpeg.
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.
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.
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
24 * video presentation timestamp (PTS) modification filter
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"
39 static 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
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
67 VAR_NB_CONSUMED_SAMPLES,
87 typedef struct SetPTSContext {
91 double var_values[VAR_VARS_NB];
92 enum AVMediaType type;
95 static av_cold int init(AVFilterContext *ctx)
97 SetPTSContext *setpts = ctx->priv;
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);
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;
117 static int config_input(AVFilterLink *inlink)
119 AVFilterContext *ctx = inlink->dst;
120 SetPTSContext *setpts = ctx->priv;
122 setpts->type = inlink->type;
123 setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
124 setpts->var_values[VAR_RTCSTART] = av_gettime();
126 setpts->var_values[VAR_SR] =
127 setpts->var_values[VAR_SAMPLE_RATE] =
128 setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
130 setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num && inlink->frame_rate.den ?
131 av_q2d(inlink->frame_rate) : NAN;
133 av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
134 setpts->var_values[VAR_TB],
135 setpts->var_values[VAR_FRAME_RATE],
136 setpts->var_values[VAR_SAMPLE_RATE]);
140 #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
141 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
142 #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
146 static inline char *double2int64str(char *buf, double v)
148 if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
149 else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
153 #define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
155 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
157 SetPTSContext *setpts = inlink->dst->priv;
158 int64_t in_pts = frame->pts;
161 if (isnan(setpts->var_values[VAR_STARTPTS])) {
162 setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
163 setpts->var_values[VAR_STARTT ] = TS2T(frame->pts, inlink->time_base);
165 setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
166 setpts->var_values[VAR_T ] = TS2T(frame->pts, inlink->time_base);
167 setpts->var_values[VAR_POS ] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);
168 setpts->var_values[VAR_RTCTIME ] = av_gettime();
170 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
171 setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
172 } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
173 setpts->var_values[VAR_S] = frame->nb_samples;
174 setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;
177 d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
178 frame->pts = D2TS(d);
180 av_log(inlink->dst, AV_LOG_TRACE,
181 "N:%"PRId64" PTS:%s T:%f POS:%s",
182 (int64_t)setpts->var_values[VAR_N],
183 d2istr(setpts->var_values[VAR_PTS]),
184 setpts->var_values[VAR_T],
185 d2istr(setpts->var_values[VAR_POS]));
186 switch (inlink->type) {
187 case AVMEDIA_TYPE_VIDEO:
188 av_log(inlink->dst, AV_LOG_TRACE, " INTERLACED:%"PRId64,
189 (int64_t)setpts->var_values[VAR_INTERLACED]);
191 case AVMEDIA_TYPE_AUDIO:
192 av_log(inlink->dst, AV_LOG_TRACE, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
193 (int64_t)setpts->var_values[VAR_NB_SAMPLES],
194 (int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
197 av_log(inlink->dst, AV_LOG_TRACE, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
199 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
200 setpts->var_values[VAR_N] += 1.0;
202 setpts->var_values[VAR_N] += frame->nb_samples;
205 setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
206 setpts->var_values[VAR_PREV_INT ] = TS2T(in_pts, inlink->time_base);
207 setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
208 setpts->var_values[VAR_PREV_OUTT] = TS2T(frame->pts, inlink->time_base);
209 if (setpts->type == AVMEDIA_TYPE_AUDIO) {
210 setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
212 return ff_filter_frame(inlink->dst->outputs[0], frame);
215 static av_cold void uninit(AVFilterContext *ctx)
217 SetPTSContext *setpts = ctx->priv;
218 av_expr_free(setpts->expr);
222 #define OFFSET(x) offsetof(SetPTSContext, x)
223 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
224 static const AVOption options[] = {
225 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
229 #if CONFIG_SETPTS_FILTER
230 #define setpts_options options
231 AVFILTER_DEFINE_CLASS(setpts);
233 static const AVFilterPad avfilter_vf_setpts_inputs[] = {
236 .type = AVMEDIA_TYPE_VIDEO,
237 .config_props = config_input,
238 .filter_frame = filter_frame,
243 static const AVFilterPad avfilter_vf_setpts_outputs[] = {
246 .type = AVMEDIA_TYPE_VIDEO,
251 AVFilter ff_vf_setpts = {
253 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
257 .priv_size = sizeof(SetPTSContext),
258 .priv_class = &setpts_class,
260 .inputs = avfilter_vf_setpts_inputs,
261 .outputs = avfilter_vf_setpts_outputs,
263 #endif /* CONFIG_SETPTS_FILTER */
265 #if CONFIG_ASETPTS_FILTER
267 #define asetpts_options options
268 AVFILTER_DEFINE_CLASS(asetpts);
270 static const AVFilterPad asetpts_inputs[] = {
273 .type = AVMEDIA_TYPE_AUDIO,
274 .config_props = config_input,
275 .filter_frame = filter_frame,
280 static const AVFilterPad asetpts_outputs[] = {
283 .type = AVMEDIA_TYPE_AUDIO,
288 AVFilter ff_af_asetpts = {
290 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
293 .priv_size = sizeof(SetPTSContext),
294 .priv_class = &asetpts_class,
295 .inputs = asetpts_inputs,
296 .outputs = asetpts_outputs,
298 #endif /* CONFIG_ASETPTS_FILTER */