alsa-api-pcm: added an 'optional' parameter

This adds a boolean 'optional' parameter for both playback and
capture devices. When the device is not detected, the stream(s)
that use is are not created, without leading to the exit of the
softmixer.

Change-Id: I3effbd61bfe1d1d4a7cde573354b9db791f759cc
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>

1 files changed, 5 insertions, 0 deletions

diff --git a/plugins/alsa/alsa-softmixer.h b/plugins/alsa/alsa-softmixer.h
index c73dd0e..d895cef 100644
--- a/plugins/alsa/alsa-softmixer.h
+++ b/plugins/alsa/alsa-softmixer.h
@@ -211,6 +211,7 @@ typedef struct AlsaSndCtlT_ {
 	long nbRegistry;
 	struct cds_list_head registryList;
 	struct SubscribeHandleT_ * eventSubscribeHandle;
+	bool optional;
 } AlsaSndCtlT;
 
 
@@ -244,6 +245,7 @@ typedef struct {
 	bool isPcmPlug;
 	void * apiVerbHandle;
 	unsigned int quirks;
+	bool optional;
 } AlsaSndPcmT;
 
 typedef struct {
@@ -283,9 +285,12 @@ typedef struct AlsaStreamAudioT_ {
     AlsaPcmCopyHandleT *copy;
 	struct cds_list_head	list;	/* link to the global list*/
 	AlsaPcmCtlT * softvol;
+
 	snd_config_t * softvolConfig;
 	snd_config_t * rateConfig;
 	void * verbApiHandle;
+	bool optional;
+	bool noHwDetected;
 } AlsaStreamAudioT;
 
 typedef struct SoftMixerT_{