[FFmpeg-cvslog] avfilter/f_realtime: add option to scale speed

[Moritz Barsnick]

ffmpeg | branch: master | Moritz Barsnick <barsnick at gmx.net> | Wed May  1 16:12:59 2019 +0200| [98541f70320bc42be277f0fadf74639c190bb827] | committer: Paul B Mahol

avfilter/f_realtime: add option to scale speed

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=98541f70320bc42be277f0fadf74639c190bb827
---

 doc/filters.texi         | 8 ++++++++
 libavfilter/f_realtime.c | 7 +++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index cd82869849..2f9333c3f3 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -21136,6 +21136,14 @@ They accept the following options:
 @item limit
 Time limit for the pauses. Any pause longer than that will be considered
 a timestamp discontinuity and reset the timer. Default is 2 seconds.
+ at item speed
+Speed factor for processing. The value must be a float larger than zero.
+Values larger than 1.0 will result in faster than realtime processing,
+smaller will slow processing down. The @var{limit} is automatically adapted
+accordingly. Default is 1.0.
+
+A processing speed faster than what is possible without these filters cannot
+be achieved.
 @end table
 
 @anchor{select}
diff --git a/libavfilter/f_realtime.c b/libavfilter/f_realtime.c
index 171c16aaaa..6fd3559dac 100644
--- a/libavfilter/f_realtime.c
+++ b/libavfilter/f_realtime.c
@@ -22,11 +22,13 @@
 #include "libavutil/time.h"
 #include "avfilter.h"
 #include "internal.h"
+#include <float.h>
 
 typedef struct RealtimeContext {
     const AVClass *class;
     int64_t delta;
     int64_t limit;
+    double speed;
     unsigned inited;
 } RealtimeContext;
 
@@ -36,7 +38,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
     RealtimeContext *s = ctx->priv;
 
     if (frame->pts != AV_NOPTS_VALUE) {
-        int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
+        int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q) / s->speed;
         int64_t now = av_gettime_relative();
         int64_t sleep = pts - now + s->delta;
         if (!s->inited) {
@@ -44,7 +46,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
             sleep = 0;
             s->delta = now - pts;
         }
-        if (sleep > s->limit || sleep < -s->limit) {
+        if (FFABS(sleep) > s->limit / s->speed) {
             av_log(ctx, AV_LOG_WARNING,
                    "time discontinuity detected: %"PRIi64" us, resetting\n",
                    sleep);
@@ -65,6 +67,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
 static const AVOption options[] = {
     { "limit", "sleep time limit", OFFSET(limit), AV_OPT_TYPE_DURATION, { .i64 = 2000000 }, 0, INT64_MAX, FLAGS },
+    { "speed", "speed factor", OFFSET(speed), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, DBL_MIN, DBL_MAX, FLAGS },
     { NULL }
 };