avfilter/buffersrc: check for valid sample rate

A sample rate <= 0 is invalid.

Fixes an assert in ffmpeg_enc.c that assumed a valid sample rate would be set.
Fixes ticket #11385.

Signed-off-by: James Almer <jamrial@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index bdf8b14451..c921803c67 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -421,6 +421,11 @@ static av_cold int init_audio(AVFilterContext *ctx)
         av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
     }
 
+    if (s->sample_rate <= 0) {
+        av_log(ctx, AV_LOG_ERROR, "Sample rate not set\n");
+        return AVERROR(EINVAL);
+    }
+
     if (!s->time_base.num)
         s->time_base = (AVRational){1, s->sample_rate};