avformat/dfpwmdec: add support to set channel layout

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

libavformat/dfpwmdec.c

@@ -31,7 +31,10 @@
 typedef struct DFPWMAudioDemuxerContext {
     AVClass *class;
     int sample_rate;
+#if FF_API_OLD_CHANNEL_LAYOUT
     int channels;
+#endif
+    AVChannelLayout ch_layout;
 } DFPWMAudioDemuxerContext;
 
 static int dfpwm_read_header(AVFormatContext *s)
@@ -39,6 +42,7 @@ static int dfpwm_read_header(AVFormatContext *s)
     DFPWMAudioDemuxerContext *s1 = s->priv_data;
     AVCodecParameters *par;
     AVStream *st;
+    int ret;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
@@ -48,7 +52,16 @@ static int dfpwm_read_header(AVFormatContext *s)
     par->codec_type  = AVMEDIA_TYPE_AUDIO;
     par->codec_id    = s->iformat->raw_codec_id;
     par->sample_rate = s1->sample_rate;
-    par->ch_layout.nb_channels = s1->channels;
+#if FF_API_OLD_CHANNEL_LAYOUT
+    if (s1->ch_layout.nb_channels) {
+#endif
+    ret = av_channel_layout_copy(&par->ch_layout, &s1->ch_layout);
+    if (ret < 0)
+        return ret;
+#if FF_API_OLD_CHANNEL_LAYOUT
+    } else
+        par->ch_layout.nb_channels = s1->channels;
+#endif
     par->bits_per_coded_sample = 1;
     par->block_align = 1;
 
@@ -58,7 +71,12 @@ static int dfpwm_read_header(AVFormatContext *s)
 
 static const AVOption dfpwm_options[] = {
     { "sample_rate", "", offsetof(DFPWMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
-    { "channels",    "", offsetof(DFPWMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+#if FF_API_OLD_CHANNEL_LAYOUT
+    { "channels",    "", offsetof(DFPWMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_DEPRECATED },
+    { "ch_layout",   "", offsetof(DFPWMAudioDemuxerContext, ch_layout),   AV_OPT_TYPE_CHLAYOUT, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
+#else
+    { "ch_layout",   "", offsetof(DFPWMAudioDemuxerContext, ch_layout),   AV_OPT_TYPE_CHLAYOUT, {.str = "mono"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
+#endif
     { NULL },
 };
 static const AVClass dfpwm_demuxer_class = {