codec2: convert to new channel layout API

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

libavformat/codec2.c

@@ -129,9 +129,8 @@ static int codec2_read_header_common(AVFormatContext *s, AVStream *st)
     st->codecpar->codec_type        = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_id          = AV_CODEC_ID_CODEC2;
     st->codecpar->sample_rate       = 8000;
-    st->codecpar->channels          = 1;
     st->codecpar->format            = AV_SAMPLE_FMT_S16;
-    st->codecpar->channel_layout    = AV_CH_LAYOUT_MONO;
+    st->codecpar->ch_layout         = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
     st->codecpar->bit_rate          = codec2_mode_bit_rate(s, mode);
     st->codecpar->frame_size        = codec2_mode_frame_size(s, mode);
     st->codecpar->block_align       = codec2_mode_block_align(s, mode);