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
27 #include "libavutil/eval.h"
28 #include "libavutil/internal.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/time.h"
37 static const char *const var_names[] = {
38 "FRAME_RATE", ///< defined only for constant frame-rate video
39 "INTERLACED", ///< tell if the current frame is interlaced
40 "N", ///< frame / sample number (starting at zero)
41 "NB_CONSUMED_SAMPLES", ///< number of samples consumed by the filter (only audio)
42 "NB_SAMPLES", ///< number of samples in the current frame (only audio)
43 "POS", ///< original position in the file of the frame
44 "PREV_INPTS", ///< previous input PTS
45 "PREV_INT", ///< previous input time in seconds
46 "PREV_OUTPTS", ///< previous output PTS
47 "PREV_OUTT", ///< previous output time in seconds
48 "PTS", ///< original pts in the file of the frame
49 "SAMPLE_RATE", ///< sample rate (only audio)
50 "STARTPTS", ///< PTS at start of movie
51 "STARTT", ///< time at start of movie
52 "T", ///< original time in the file of the frame
54 "RTCTIME", ///< wallclock (RTC) time in micro seconds
55 "RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
56 "S", // Number of samples in the current frame
57 "SR", // Audio sample rate
65 VAR_NB_CONSUMED_SAMPLES,
89 double var_values[VAR_VARS_NB];
90 enum AVMediaType type;
93 static av_cold int init(AVFilterContext *ctx)
95 SetPTSContext *setpts = ctx->priv;
98 if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
99 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
100 av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
104 setpts->var_values[VAR_N] = 0.0;
105 setpts->var_values[VAR_S] = 0.0;
106 setpts->var_values[VAR_PREV_INPTS] = NAN;
107 setpts->var_values[VAR_PREV_INT] = NAN;
108 setpts->var_values[VAR_PREV_OUTPTS] = NAN;
109 setpts->var_values[VAR_PREV_OUTT] = NAN;
110 setpts->var_values[VAR_STARTPTS] = NAN;
111 setpts->var_values[VAR_STARTT] = NAN;
115 static int config_input(AVFilterLink *inlink)
117 AVFilterContext *ctx = inlink->dst;
118 SetPTSContext *setpts = ctx->priv;
120 setpts->type = inlink->type;
121 setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
122 setpts->var_values[VAR_RTCSTART] = av_gettime();
124 setpts->var_values[VAR_SR] =
125 setpts->var_values[VAR_SAMPLE_RATE] =
126 setpts->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
128 setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num && inlink->frame_rate.den ?
129 av_q2d(inlink->frame_rate) : NAN;
131 av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f FRAME_RATE:%f SAMPLE_RATE:%f\n",
132 setpts->var_values[VAR_TB],
133 setpts->var_values[VAR_FRAME_RATE],
134 setpts->var_values[VAR_SAMPLE_RATE]);
138 #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
139 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
140 #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb))
144 static inline char *double2int64str(char *buf, double v)
146 if (isnan(v)) snprintf(buf, BUF_SIZE, "nan");
147 else snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)v);
151 #define d2istr(v) double2int64str((char[BUF_SIZE]){0}, v)
153 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
155 SetPTSContext *setpts = inlink->dst->priv;
156 int64_t in_pts = frame->pts;
159 if (isnan(setpts->var_values[VAR_STARTPTS])) {
160 setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
161 setpts->var_values[VAR_STARTT ] = TS2T(frame->pts, inlink->time_base);
163 setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
164 setpts->var_values[VAR_T ] = TS2T(frame->pts, inlink->time_base);
165 setpts->var_values[VAR_POS ] = av_frame_get_pkt_pos(frame) == -1 ? NAN : av_frame_get_pkt_pos(frame);
166 setpts->var_values[VAR_RTCTIME ] = av_gettime();
168 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
169 setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
170 } else if (inlink->type == AVMEDIA_TYPE_AUDIO) {
171 setpts->var_values[VAR_S] = frame->nb_samples;
172 setpts->var_values[VAR_NB_SAMPLES] = frame->nb_samples;
175 d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
176 frame->pts = D2TS(d);
178 av_log(inlink->dst, AV_LOG_DEBUG,
179 "N:%"PRId64" PTS:%s T:%f POS:%s",
180 (int64_t)setpts->var_values[VAR_N],
181 d2istr(setpts->var_values[VAR_PTS]),
182 setpts->var_values[VAR_T],
183 d2istr(setpts->var_values[VAR_POS]));
184 switch (inlink->type) {
185 case AVMEDIA_TYPE_VIDEO:
186 av_log(inlink->dst, AV_LOG_DEBUG, " INTERLACED:%"PRId64,
187 (int64_t)setpts->var_values[VAR_INTERLACED]);
189 case AVMEDIA_TYPE_AUDIO:
190 av_log(inlink->dst, AV_LOG_DEBUG, " NB_SAMPLES:%"PRId64" NB_CONSUMED_SAMPLES:%"PRId64,
191 (int64_t)setpts->var_values[VAR_NB_SAMPLES],
192 (int64_t)setpts->var_values[VAR_NB_CONSUMED_SAMPLES]);
195 av_log(inlink->dst, AV_LOG_DEBUG, " -> PTS:%s T:%f\n", d2istr(d), TS2T(d, inlink->time_base));
197 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
198 setpts->var_values[VAR_N] += 1.0;
200 setpts->var_values[VAR_N] += frame->nb_samples;
203 setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
204 setpts->var_values[VAR_PREV_INT ] = TS2T(in_pts, inlink->time_base);
205 setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
206 setpts->var_values[VAR_PREV_OUTT] = TS2T(frame->pts, inlink->time_base);
207 if (setpts->type == AVMEDIA_TYPE_AUDIO) {
208 setpts->var_values[VAR_NB_CONSUMED_SAMPLES] += frame->nb_samples;
210 return ff_filter_frame(inlink->dst->outputs[0], frame);
213 static av_cold void uninit(AVFilterContext *ctx)
215 SetPTSContext *setpts = ctx->priv;
216 av_expr_free(setpts->expr);
220 #define OFFSET(x) offsetof(SetPTSContext, x)
221 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
222 static const AVOption options[] = {
223 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
227 #if CONFIG_SETPTS_FILTER
228 #define setpts_options options
229 AVFILTER_DEFINE_CLASS(setpts);
231 static const AVFilterPad avfilter_vf_setpts_inputs[] = {
234 .type = AVMEDIA_TYPE_VIDEO,
235 .get_video_buffer = ff_null_get_video_buffer,
236 .config_props = config_input,
237 .filter_frame = filter_frame,
242 static const AVFilterPad avfilter_vf_setpts_outputs[] = {
245 .type = AVMEDIA_TYPE_VIDEO,
250 AVFilter avfilter_vf_setpts = {
252 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
256 .priv_size = sizeof(SetPTSContext),
257 .priv_class = &setpts_class,
259 .inputs = avfilter_vf_setpts_inputs,
260 .outputs = avfilter_vf_setpts_outputs,
262 #endif /* CONFIG_SETPTS_FILTER */
264 #if CONFIG_ASETPTS_FILTER
266 #define asetpts_options options
267 AVFILTER_DEFINE_CLASS(asetpts);
269 static const AVFilterPad asetpts_inputs[] = {
272 .type = AVMEDIA_TYPE_AUDIO,
273 .get_audio_buffer = ff_null_get_audio_buffer,
274 .config_props = config_input,
275 .filter_frame = filter_frame,
280 static const AVFilterPad asetpts_outputs[] = {
283 .type = AVMEDIA_TYPE_AUDIO,
288 AVFilter avfilter_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 */