lavd/lavfi: compute and use the used samples buffer size for the output audio packet...

Do not assume the used size is the same of the allocated size, as it was
wrongly assumed. Fix audio playback when the two values differ.

diff --git a/libavdevice/lavfi.c b/libavdevice/lavfi.c
index 4d7297b..0477081 100644 (file)
--- a/libavdevice/lavfi.c
+++ b/libavdevice/lavfi.c
@@ -299,7 +299,9 @@ static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
         avpicture_layout(&pict, ref->format, ref->video->w,
                          ref->video->h, pkt->data, size);
     } else if (ref->audio) {
-        size = ref->linesize[0];
+        size = ref->audio->nb_samples *
+            av_get_bytes_per_sample(ref->format) *
+            av_get_channel_layout_nb_channels(ref->audio->channel_layout);
         if ((ret = av_new_packet(pkt, size)) < 0)
             return ret;
         memcpy(pkt->data, ref->data[0], size);