[PATCH 3/3] speaker-test: Show out-of-chmap channels as Unknown

[Anssi Hannula <anssi.hannula@iki.fi>]

Currently speaker-test falls back to ALSA default channel names for
channels out-of-chmap.

This causes e.g. the 4th channel of
$ speaker-test -c4 -Dhdmi -m "FR,FL,FC"
to be shown as "Rear Right".

Change the code to show such channels as Unknown instead, similar to
when snd_pcm_chmap_long_name() does not know the name.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
---
 speaker-test/speaker-test.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/speaker-test/speaker-test.c b/speaker-test/speaker-test.c
index 82cc3b1..8ab5011 100644
--- a/speaker-test/speaker-test.c
+++ b/speaker-test/speaker-test.c
@@ -254,8 +254,10 @@ static int get_speaker_channel(int chn)
 static const char *get_channel_name(int chn)
 {
 #ifdef CONFIG_SUPPORT_CHMAP
-  if (channel_map && chn < channel_map->channels) {
-    const char *name = snd_pcm_chmap_long_name(channel_map->pos[chn]);
+  if (channel_map) {
+    const char *name = NULL;
+    if (chn < channel_map->channels)
+      name = snd_pcm_chmap_long_name(channel_map->pos[chn]);
     return name ? name : "Unknown";
   }
 #endif
-- 
1.8.1.5