access/alsa.c: print the subdevices also

modules/access/alsa.c

@@ -207,9 +207,26 @@ static char *ListAvailableDevices( demux_t *p_demux, bool b_probe )
             if( snd_ctl_pcm_info( p_ctl, p_pcminfo ) < 0 ) continue;
 
             if( !b_probe )
+            {
                 msg_Dbg( p_demux, "    hw:%d,%d : %s (%s)", i_card, i_dev,
                          snd_pcm_info_get_id( p_pcminfo ),
                          snd_pcm_info_get_name( p_pcminfo ) );
+
+                int count = snd_pcm_info_get_subdevices_count( p_pcminfo );
+                msg_Dbg( p_demux, "      subdevices: %i/%i",
+                         snd_pcm_info_get_subdevices_avail( p_pcminfo ), count );
+                for( int idx = 0; idx < count; idx++ )
+                {
+                    snd_pcm_info_set_subdevice( p_pcminfo, idx );
+                    int err = snd_ctl_pcm_info( p_ctl, p_pcminfo );
+                    if( err < 0 )
+                        msg_Err( p_demux, "control digital audio playback info (%i): %s",
+                                 i_card, snd_strerror( err ) );
+                    else
+                        msg_Dbg( p_demux, "      %i: %s",
+                                 idx, snd_pcm_info_get_subdevice_name( p_pcminfo ) );
+                }
+            }
             else
             {
                 char *psz_device;