bluetooth sco: fixed the softvol open error

This fixes #SPEC-2125.
The fix consists in specifying the number of channels
in the softvol pcm configuration.
When it is not set, the libasound detects a configuration
mismatch (the default number of channels being 2), and
attempts to remove the sotfvol control, which for unknown reason,
(broken support on kernel side ?) randomly fails.

Change-Id: I816b623715e413452e6793ee519e97fac6fdde43
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>

1 files changed, 3 insertions, 1 deletions

diff --git a/plugins/alsa/alsa-plug-vol.c b/plugins/alsa/alsa-plug-vol.c
index 67400a5..09025c4 100644
--- a/plugins/alsa/alsa-plug-vol.c
+++ b/plugins/alsa/alsa-plug-vol.c
@@ -32,7 +32,7 @@ PUBLIC AlsaPcmCtlT *AlsaCreateSoftvol(SoftMixerT *mixer, AlsaStreamAudioT *strea
     int error = 0;
 	AlsaPcmCtlT *pcmVol = NULL;
 
-	AFB_ApiDebug(mixer->api, "%s create SOFTVOL on %s", __func__, slaveid);
+	AFB_ApiDebug(mixer->api, "%s create SOFTVOL on %s (nb channels=%d)", __func__, slaveid, stream->params->channels);
 	if (asprintf(&cardid, "softvol-%s", stream->uid) == -1) {
 		SOFTMIXER_NOMEM(mixer->api);
         goto OnErrorExit;
@@ -70,6 +70,8 @@ PUBLIC AlsaPcmCtlT *AlsaCreateSoftvol(SoftMixerT *mixer, AlsaStreamAudioT *strea
     error += snd_config_add(controlConfig, elemConfig);
     error += snd_config_imake_integer(&elemConfig, "card", sndcard->cid.cardidx);
     error += snd_config_add(controlConfig, elemConfig);
+    error += snd_config_imake_integer(&elemConfig, "count", stream->params->channels);
+    error += snd_config_add(controlConfig, elemConfig);
     error += snd_config_add(streamConfig, controlConfig);
     if (error) goto OnErrorExit;