oss: port to new channel layout API

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

libavdevice/oss_dec.c

@@ -59,7 +59,7 @@ static int audio_read_header(AVFormatContext *s1)
     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_id = s->codec_id;
     st->codecpar->sample_rate = s->sample_rate;
-    st->codecpar->channels = s->channels;
+    st->codecpar->ch_layout.nb_channels = s->channels;
 
     avpriv_set_pts_info(st, 64, 1, 1000000);  /* 64 bits pts in us */
     return 0;

libavdevice/oss_enc.c

@@ -43,7 +43,7 @@ static int audio_write_header(AVFormatContext *s1)
 
     st = s1->streams[0];
     s->sample_rate = st->codecpar->sample_rate;
-    s->channels = st->codecpar->channels;
+    s->channels = st->codecpar->ch_layout.nb_channels;
     ret = ff_oss_audio_open(s1, 1, s1->url);
     if (ret < 0) {
         return AVERROR(EIO);