@@ -251,6 +251,7 @@ static int wv_read_packet(AVFormatContext *s,

     int ret;

     int size, ver, off;

     int64_t pos;

+    uint32_t block_samples;

     if (s->pb->eof_reached)

         return AVERROR(EIO);

@@ -316,6 +317,12 @@ static int wv_read_packet(AVFormatContext *s,

     pkt->stream_index = 0;

     wc->block_parsed = 1;

     pkt->pts = wc->soff;

+    block_samples = AV_RN32(wc->extra);

+    if (block_samples > INT32_MAX)

+        av_log(s, AV_LOG_WARNING, "Too many samples in block: %"PRIu32"\n", block_samples);

+    else

+        pkt->duration = block_samples;

+

     av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);

     return 0;

 }