2 * Copyright (c) 2010 Stefano Sabatini
3 * Copyright (c) 2008 Victor Paesa
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
42 static const char *const var_names[] = {
43 "E", ///< Euler number
44 "INTERLACED", ///< tell if the current frame is interlaced
45 "N", ///< frame / sample number (starting at zero)
46 "PHI", ///< golden ratio
48 "PREV_INPTS", ///< previous input PTS
49 "PREV_OUTPTS", ///< previous output PTS
50 "PTS", ///< original pts in the file of the frame
51 "STARTPTS", ///< PTS at start of movie
53 "RTCTIME", ///< wallclock (RTC) time in micro seconds
54 "RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
55 "S", // Number of samples in the current frame
56 "SR", // Audio sample rate
78 typedef struct SetPTSContext {
82 double var_values[VAR_VARS_NB];
85 static av_cold int init(AVFilterContext *ctx)
87 SetPTSContext *setpts = ctx->priv;
90 if ((ret = av_expr_parse(&setpts->expr, setpts->expr_str,
91 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
92 av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", setpts->expr_str);
96 setpts->var_values[VAR_E] = M_E;
97 setpts->var_values[VAR_N] = 0.0;
98 setpts->var_values[VAR_S] = 0.0;
99 setpts->var_values[VAR_PHI] = M_PHI;
100 setpts->var_values[VAR_PI] = M_PI;
101 setpts->var_values[VAR_PREV_INPTS] = NAN;
102 setpts->var_values[VAR_PREV_OUTPTS] = NAN;
103 setpts->var_values[VAR_STARTPTS] = NAN;
107 static int config_input(AVFilterLink *inlink)
109 SetPTSContext *setpts = inlink->dst->priv;
111 setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
112 setpts->var_values[VAR_RTCSTART] = av_gettime();
114 if (inlink->type == AVMEDIA_TYPE_AUDIO) {
115 setpts->var_values[VAR_SR] = inlink->sample_rate;
118 av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
122 #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
123 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
125 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
127 SetPTSContext *setpts = inlink->dst->priv;
128 int64_t in_pts = frame->pts;
131 if (isnan(setpts->var_values[VAR_STARTPTS]))
132 setpts->var_values[VAR_STARTPTS] = TS2D(frame->pts);
134 setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
135 setpts->var_values[VAR_RTCTIME ] = av_gettime();
137 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
138 setpts->var_values[VAR_INTERLACED] = frame->interlaced_frame;
140 setpts->var_values[VAR_S] = frame->nb_samples;
143 d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
144 frame->pts = D2TS(d);
147 "n:%"PRId64" interlaced:%d pts:%"PRId64" t:%f -> pts:%"PRId64" t:%f\n",
148 (int64_t)setpts->var_values[VAR_N],
149 (int)setpts->var_values[VAR_INTERLACED],
150 in_pts, in_pts * av_q2d(inlink->time_base),
151 frame->pts, frame->pts * av_q2d(inlink->time_base));
153 if (inlink->type == AVMEDIA_TYPE_VIDEO) {
154 setpts->var_values[VAR_N] += 1.0;
156 setpts->var_values[VAR_N] += frame->nb_samples;
159 setpts->var_values[VAR_PREV_INPTS ] = TS2D(in_pts);
160 setpts->var_values[VAR_PREV_OUTPTS] = TS2D(frame->pts);
161 return ff_filter_frame(inlink->dst->outputs[0], frame);
164 static av_cold void uninit(AVFilterContext *ctx)
166 SetPTSContext *setpts = ctx->priv;
167 av_expr_free(setpts->expr);
171 #define OFFSET(x) offsetof(SetPTSContext, x)
172 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM
173 static const AVOption options[] = {
174 { "expr", "Expression determining the frame timestamp", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "PTS" }, .flags = FLAGS },
178 #if CONFIG_SETPTS_FILTER
179 static const AVClass setpts_class = {
180 .class_name = "setpts",
181 .item_name = av_default_item_name,
183 .version = LIBAVUTIL_VERSION_INT,
186 static const AVFilterPad avfilter_vf_setpts_inputs[] = {
189 .type = AVMEDIA_TYPE_VIDEO,
190 .get_video_buffer = ff_null_get_video_buffer,
191 .config_props = config_input,
192 .filter_frame = filter_frame,
197 static const AVFilterPad avfilter_vf_setpts_outputs[] = {
200 .type = AVMEDIA_TYPE_VIDEO,
205 AVFilter ff_vf_setpts = {
207 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output video frame."),
211 .priv_size = sizeof(SetPTSContext),
212 .priv_class = &setpts_class,
214 .inputs = avfilter_vf_setpts_inputs,
215 .outputs = avfilter_vf_setpts_outputs,
219 #if CONFIG_ASETPTS_FILTER
220 static const AVClass asetpts_class = {
221 .class_name = "asetpts",
222 .item_name = av_default_item_name,
224 .version = LIBAVUTIL_VERSION_INT,
227 static const AVFilterPad asetpts_inputs[] = {
230 .type = AVMEDIA_TYPE_AUDIO,
231 .get_audio_buffer = ff_null_get_audio_buffer,
232 .config_props = config_input,
233 .filter_frame = filter_frame,
238 static const AVFilterPad asetpts_outputs[] = {
241 .type = AVMEDIA_TYPE_AUDIO,
246 AVFilter ff_af_asetpts = {
248 .description = NULL_IF_CONFIG_SMALL("Set PTS for the output audio frame."),
252 .priv_size = sizeof(SetPTSContext),
253 .priv_class = &asetpts_class,
255 .inputs = asetpts_inputs,
256 .outputs = asetpts_outputs,