@@ -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

@@ -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);