ws-snd1: set channel layout

libavcodec/ws-snd1.c

@@ -20,6 +20,8 @@
  */
 
 #include <stdint.h>
+
+#include "libavutil/audioconvert.h"
 #include "libavutil/common.h"
 #include "libavutil/intreadwrite.h"
 #include "avcodec.h"
@@ -46,12 +48,9 @@ static av_cold int ws_snd_decode_init(AVCodecContext *avctx)
 {
     WSSndContext *s = avctx->priv_data;
 
-    if (avctx->channels != 1) {
-        av_log_ask_for_sample(avctx, "unsupported number of channels\n");
-        return AVERROR(EINVAL);
-    }
-
-    avctx->sample_fmt = AV_SAMPLE_FMT_U8;
+    avctx->channels       = 1;
+    avctx->channel_layout = AV_CH_LAYOUT_MONO;
+    avctx->sample_fmt     = AV_SAMPLE_FMT_U8;
 
     avcodec_get_frame_defaults(&s->frame);
     avctx->coded_frame = &s->frame;