g726: convert to new channel layout API

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/g726.c

@@ -324,7 +324,7 @@ static av_cold int g726_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 is supported\n");
         return AVERROR(EINVAL);
     }
@@ -436,12 +436,12 @@ static av_cold int g726_decode_init(AVCodecContext *avctx)
 {
     G726Context* c = avctx->priv_data;
 
-    if(avctx->channels > 1){
+    if (avctx->ch_layout.nb_channels > 1){
         avpriv_request_sample(avctx, "Decoding more than one channel");
         return AVERROR_PATCHWELCOME;
     }
-    avctx->channels       = 1;
+    av_channel_layout_uninit(&avctx->ch_layout);
-    avctx->channel_layout = AV_CH_LAYOUT_MONO;
+    avctx->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
 
     c->little_endian = !strcmp(avctx->codec->name, "g726le");