[FFmpeg-cvslog] lavfi/atempo: avoid asendcmd assertion failure

[Rajiv Harlalka]

ffmpeg | branch: master | Rajiv Harlalka <rajivharlalka009 at gmail.com> | Tue Mar 12 21:01:16 2024 -0600| [4700925d22c79988688596bda8e862ef3ff39293] | committer: Kieran Kunhya

lavfi/atempo: avoid asendcmd assertion failure

Check for zeros equal to the total samples early, because in
that case we would already be leaving the first few frames out.

Fixes trac ticket #10692

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4700925d22c79988688596bda8e862ef3ff39293
---

 libavfilter/af_atempo.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/libavfilter/af_atempo.c b/libavfilter/af_atempo.c
index 4621b67b03..654b080e89 100644
--- a/libavfilter/af_atempo.c
+++ b/libavfilter/af_atempo.c
@@ -531,21 +531,21 @@ static int yae_load_frag(ATempoContext *atempo,
     dst = frag->data;
 
     start = atempo->position[0] - atempo->size;
-    zeros = 0;
 
-    if (frag->position[0] < start) {
-        // what we don't have we substitute with zeros:
-        zeros = FFMIN(start - frag->position[0], (int64_t)nsamples);
-        av_assert0(zeros != nsamples);
-
-        memset(dst, 0, zeros * atempo->stride);
-        dst += zeros * atempo->stride;
-    }
+    // what we don't have we substitute with zeros:
+    zeros =
+      frag->position[0] < start ?
+      FFMIN(start - frag->position[0], (int64_t)nsamples) : 0;
 
     if (zeros == nsamples) {
         return 0;
     }
 
+    if (frag->position[0] < start) {
+        memset(dst, 0, zeros * atempo->stride);
+        dst += zeros * atempo->stride;
+    }
+
     // get the remaining data from the ring buffer:
     na = (atempo->head < atempo->tail ?
           atempo->tail - atempo->head :