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vf_fps: add 'start_time' option

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This allows for dropping or duplication to match a particular start time.
This commit is contained in:
Justin Ruggles
2013-08-15 16:14:57 -04:00
committed by Justin Ruggles
parent 2a61592573
commit 545a0b807c
2 changed files with 23 additions and 1 deletions
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16
libavfilter/vf_fps.c
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@@ -40,6 +40,8 @@ typedef struct FPSContext {
int64_t first_pts; ///< pts of the first frame that arrived on this filter
int64_t pts; ///< pts of the first frame currently in the fifo
double start_time; ///< pts, in seconds, of the expected first frame
AVRational framerate; ///< target framerate
char *fps; ///< a string describing target framerate
@@ -54,6 +56,7 @@ typedef struct FPSContext {
#define V AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
{ "fps", "A string describing desired output framerate", OFFSET(fps), AV_OPT_TYPE_STRING, { .str = "25" }, .flags = V },
{ "start_time", "Assume the first PTS should be this value.", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, { .dbl = AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX, V },
{ NULL },
};
@@ -78,6 +81,7 @@ static av_cold int init(AVFilterContext *ctx)
return AVERROR(ENOMEM);
s->pts = AV_NOPTS_VALUE;
s->first_pts = AV_NOPTS_VALUE;
av_log(ctx, AV_LOG_VERBOSE, "fps=%d/%d\n", s->framerate.num, s->framerate.den);
return 0;
@@ -177,7 +181,17 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
if (ret < 0)
return ret;
s->first_pts = s->pts = buf->pts;
if (s->start_time != AV_NOPTS_VALUE) {
double first_pts = s->start_time * AV_TIME_BASE;
first_pts = FFMIN(FFMAX(first_pts, INT64_MIN), INT64_MAX);
s->first_pts = s->pts = av_rescale_q(first_pts, AV_TIME_BASE_Q,
inlink->time_base);
av_log(ctx, AV_LOG_VERBOSE, "Set first pts to (in:%"PRId64" out:%"PRId64")\n",
s->first_pts, av_rescale_q(first_pts, AV_TIME_BASE_Q,
outlink->time_base));
} else {
s->first_pts = s->pts = buf->pts;
}
} else {
av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no "
"timestamp.\n");