libilbc: convert to new channel layout API

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/libilbc.c

@@ -78,8 +78,8 @@ static av_cold int ilbc_decode_init(AVCodecContext *avctx)
 
     WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
 
-    avctx->channels       = 1;
-    avctx->channel_layout = AV_CH_LAYOUT_MONO;
+    av_channel_layout_uninit(&avctx->ch_layout);
+    avctx->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
     avctx->sample_rate    = 8000;
     avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
 
@@ -161,7 +161,7 @@ static av_cold int ilbc_encode_init(AVCodecContext *avctx)
         return AVERROR(EINVAL);
     }
 
-    if (avctx->channels != 1) {
+    if (avctx->ch_layout.nb_channels != 1) {
         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
         return AVERROR(EINVAL);
     }