diff options
| -rw-r--r-- | doc/filters.texi | 8 | ||||
| -rw-r--r-- | libavfilter/af_adelay.c | 10 |
2 files changed, 16 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 8cef0a0345..f43465d05d 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -513,6 +513,7 @@ Set list of delays in milliseconds for each channel separated by '|'. At least one delay greater than 0 should be provided. Unused delays will be silently ignored. If number of given delays is smaller than number of channels all remaining channels will not be delayed. +If you want to delay exact number of samples, append 'S' to number. @end table @subsection Examples @@ -524,6 +525,13 @@ the second channel (and any other channels that may be present) unchanged. @example adelay=1500|0|500 @end example + +@item +Delay second channel by 500 samples, the third channel by 700 samples and leave +the first channel (and any other channels that may be present) unchanged. +@example +adelay=0|500S|700S +@end example @end itemize @section aecho diff --git a/libavfilter/af_adelay.c b/libavfilter/af_adelay.c index 09bf3c7732..187cacf28a 100644 --- a/libavfilter/af_adelay.c +++ b/libavfilter/af_adelay.c @@ -138,14 +138,20 @@ static int config_input(AVFilterLink *inlink) for (i = 0; i < s->nb_delays; i++) { ChanDelay *d = &s->chandelay[i]; float delay; + char type = 0; + int ret; if (!(arg = av_strtok(p, "|", &saveptr))) break; p = NULL; - sscanf(arg, "%f", &delay); - d->delay = delay * inlink->sample_rate / 1000.0; + ret = sscanf(arg, "%d%c", &d->delay, &type); + if (ret != 2 || type != 'S') { + sscanf(arg, "%f", &delay); + d->delay = delay * inlink->sample_rate / 1000.0; + } + if (d->delay < 0) { av_log(ctx, AV_LOG_ERROR, "Delay must be non negative number.\n"); return AVERROR(EINVAL); |