avdevice/lavfi: convert to new channel layout API

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

libavdevice/lavfi.c

@@ -332,9 +332,12 @@ av_cold static int lavfi_read_header(AVFormatContext *avctx)
             st       ->sample_aspect_ratio =
             par->sample_aspect_ratio = av_buffersink_get_sample_aspect_ratio(sink);
         } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
-            par->channels    = av_buffersink_get_channels(sink);
             par->sample_rate = av_buffersink_get_sample_rate(sink);
-            par->channel_layout = av_buffersink_get_channel_layout(sink);
+            ret = av_channel_layout_from_mask(&par->ch_layout, av_buffersink_get_channel_layout(sink));
+            if (ret < 0) {
+                par->ch_layout.nb_channels = av_buffersink_get_channels(sink);
+                par->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
+            }
             par->format      = av_buffersink_get_format(sink);
             par->codec_id    = av_get_pcm_codec(par->format, -1);
             if (par->codec_id == AV_CODEC_ID_NONE)