File 0026-PCM-Fill-SND_CHMAP_NA-to-silent-channels-in-route-pl.patch of Package alsa

From 5a2daef19225478df7e3c1f8c6c9cb847e574b44 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Thu, 20 Sep 2012 13:43:12 +0200
Subject: [PATCH 26/30] PCM: Fill SND_CHMAP_NA to silent channels in route
 plugin

Instead of SND_CHMAP_UNKNOWN, fill SND_CHMAP_NA to the silent channels.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 src/pcm/pcm_route.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/src/pcm/pcm_route.c
+++ b/src/pcm/pcm_route.c
@@ -720,11 +720,13 @@ static snd_pcm_chmap_t *snd_pcm_route_ge
 		return NULL;
 	}
 	map->channels = nsrcs;
+	for (src = 0; src < nsrcs; src++)
+		map->pos[src] = SND_CHMAP_NA;
 	for (dst = 0; dst < route->params.ndsts; dst++) {
 		snd_pcm_route_ttable_dst_t *d = &route->params.dsts[dst];
 		for (src = 0; src < d->nsrcs; src++) {
 			int c = d->srcs[src].channel;
-			if (c < nsrcs && !map->pos[c])
+			if (c < nsrcs && map->pos[c] == SND_CHMAP_NA)
 				map->pos[c] = slave_map->pos[dst];
 		}
 	}