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
60 "FR", ///< defined only for constant frame-rate video
68 VAR_NB_CONSUMED_SAMPLES,
89 typedef struct SetPTSContext {
93 double var_values[VAR_VARS_NB];
94 enum AVMediaType type;
97 static av_cold int init(AVFilterContext *ctx)
99 SetPTSContext *setpts = ctx->priv;
102 if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
103 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
104 av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
108 setpts->var_values[VAR_N] = 0.0;
109 setpts->var_values[VAR_S] = 0.0;
110 setpts->var_values[VAR_PREV_INPTS] = NAN;
111 setpts->var_values[VAR_PREV_INT] = NAN;
112 setpts->var_values[VAR_PREV_OUTPTS] = NAN;
113 setpts->var_values[VAR_PREV_OUTT] = NAN;
114 setpts->var_values[VAR_STARTPTS] = NAN;
115 setpts->var_values[VAR_STARTT] = NAN;
119 static int config_input(AVFilterLink *inlink)
121 AVFilterContext *ctx = inlink->dst;
122 SetPTSContext *setpts = ctx->priv;
124 setpts->type = inlink->type;
125 setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
126 setpts->var_values[VAR_RTCSTART] = av_gettime();
128 setpts->var_values[VAR_SR] =
129 setpts->var_values[VAR_SAMPLE_RATE] =
130 setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
132 setpts->var_values[VAR_FRAME_RATE] =
133 setpts->var_values[VAR_FR] = inlink->frame_rate.num &&
134 inlink->frame_rate.den ?
135 av_q2d(inlink->frame_rate) : NAN;
137 av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
138 setpts->var_values[VAR_TB],
139 setpts->var_values[VAR_FRAME_RATE],
140 setpts->var_values[VAR_SAMPLE_RATE]);
144 #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
145 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
146 #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
150 static inline char *double2int64str(char *buf, double v)
152 if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
153 else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
157 #define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
159 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
161 SetPTSContext *setpts = inlink->dst->priv;
162 int64_t in_pts = frame->pts;
165 if (isnan(setpts->var_values[VAR_STARTPTS])) {
166 setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
167 setpts->var_values[VAR_STARTT ] = TS2T(frame->pts, inlink->time_base);
169 setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
170 setpts->var_values[VAR_T ] = TS2T(frame->pts, inlink->time_base);
171 setpts->var_values[VAR_POS ] = frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
172 setpts->var_values[VAR_RTCTIME ] = av_gettime();
174 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
175 setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
176 } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
177 setpts->var_values[VAR_S] = frame->nb_samples;
178 setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;
181 d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
182 frame->pts = D2TS(d);
184 av_log(inlink->dst, AV_LOG_TRACE,
185 "N:%"PRId64" PTS:%s T:%f POS:%s",
186 (int64_t)setpts->var_values[VAR_N],
187 d2istr(setpts->var_values[VAR_PTS]),
188 setpts->var_values[VAR_T],
189 d2istr(setpts->var_values[VAR_POS]));
190 switch (inlink->type) {
191 case AVMEDIA_TYPE_VIDEO:
192 av_log(inlink->dst, AV_LOG_TRACE, " INTERLACED:%"PRId64,
193 (int64_t)setpts->var_values[VAR_INTERLACED]);
195 case AVMEDIA_TYPE_AUDIO:
196 av_log(inlink->dst, AV_LOG_TRACE, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
197 (int64_t)setpts->var_values[VAR_NB_SAMPLES],
198 (int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
201 av_log(inlink->dst, AV_LOG_TRACE, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
203 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
204 setpts->var_values[VAR_N] += 1.0;
206 setpts->var_values[VAR_N] += frame->nb_samples;
209 setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
210 setpts->var_values[VAR_PREV_INT ] = TS2T(in_pts, inlink->time_base);
211 setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
212 setpts->var_values[VAR_PREV_OUTT] = TS2T(frame->pts, inlink->time_base);
213 if (setpts->type == AVMEDIA_TYPE_AUDIO) {
214 setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
216 return ff_filter_frame(inlink->dst->outputs[0], frame);
219 static av_cold void uninit(AVFilterContext *ctx)
221 SetPTSContext *setpts = ctx->priv;
222 av_expr_free(setpts->expr);
226 #define OFFSET(x) offsetof(SetPTSContext, x)
227 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
228 static const AVOption options[] = {
229 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
233 #if CONFIG_SETPTS_FILTER
234 #define setpts_options options
235 AVFILTER_DEFINE_CLASS(setpts);
237 static const AVFilterPad avfilter_vf_setpts_inputs[] = {
240 .type = AVMEDIA_TYPE_VIDEO,
241 .config_props = config_input,
242 .filter_frame = filter_frame,
247 static const AVFilterPad avfilter_vf_setpts_outputs[] = {
250 .type = AVMEDIA_TYPE_VIDEO,
255 AVFilter ff_vf_setpts = {
257 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
261 .priv_size = sizeof(SetPTSContext),
262 .priv_class = &setpts_class,
264 .inputs = avfilter_vf_setpts_inputs,
265 .outputs = avfilter_vf_setpts_outputs,
267 #endif /* CONFIG_SETPTS_FILTER */
269 #if CONFIG_ASETPTS_FILTER
271 #define asetpts_options options
272 AVFILTER_DEFINE_CLASS(asetpts);
274 static const AVFilterPad asetpts_inputs[] = {
277 .type = AVMEDIA_TYPE_AUDIO,
278 .config_props = config_input,
279 .filter_frame = filter_frame,
284 static const AVFilterPad asetpts_outputs[] = {
287 .type = AVMEDIA_TYPE_AUDIO,
292 AVFilter ff_af_asetpts = {
294 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
297 .priv_size = sizeof(SetPTSContext),
298 .priv_class = &asetpts_class,
299 .inputs = asetpts_inputs,
300 .outputs = asetpts_outputs,
302 #endif /* CONFIG_ASETPTS_FILTER */