Add support for AVIRT

Leverage the new AVIRT driver for a more secure, more dynamically
configurable loopback sound driver.

To use, replace the file smixer-4a-default.json with
smixer-4a-avirt.json, at /usr/libexec/agl/smixer/etc.
The snd-avirt drivers are installed in AGL by default as of 6.99.2.

The existing snd-aloop configuration is not broken by this change.

Change-Id: I827636656c109a7393ad77997e05069a2462ea46
Signed-off-by: Mark Farrugia <mark.farrugia@fiberdyne.com.au>

1 files changed, 5 insertions, 4 deletions

diff --git a/plugins/alsa/alsa-softmixer.h b/plugins/alsa/alsa-softmixer.h
index b6c0e5b..2fb9370 100644
--- a/plugins/alsa/alsa-softmixer.h
+++ b/plugins/alsa/alsa-softmixer.h
@@ -242,7 +242,7 @@ typedef struct {
 
 typedef struct {
     char * uid;
-    int index;
+    int index; // AVIRT: parent PCM index (Since subdev idx is always 0)
     int numid;
 	struct cds_list_head list;
 } AlsaLoopSubdevT;
@@ -251,10 +251,11 @@ typedef struct {
 struct SoftMixerT_;
 
 typedef struct AlsaSndLoopT {
+    bool avirt; // AVIRT: Is this loop AVIRT?
     const char *uid;
 	struct SoftMixerT_ * mixer; /* owner */
-    int playback;
-    int capture;
+    int playback; // AVIRT: UNUSED
+    int capture; // AVIRT: UNUSED
     AlsaSndCtlT *sndcard;
 	int nbSubdevs;
 	AlsaLoopSubdevT subdevs;
@@ -368,7 +369,7 @@ PUBLIC AlsaPcmCtlT* AlsaCreateDmix(SoftMixerT *mixer, const char* pcmName, AlsaS
 
 // alsa-api-*
 
-PUBLIC int ApiLoopAttach(SoftMixerT *mixer, afb_req_t request, const char *, json_object * argsJ);
+PUBLIC int ApiLoopAttach(SoftMixerT *mixer, afb_req_t request, const char *, json_object * argsJ, json_object *streamsJ);
 PUBLIC int ApiSourceAttach(SoftMixerT *mixer, afb_req_t request, const char *, json_object * argsJ);
 PUBLIC int ApiSinkAttach(SoftMixerT *mixer, afb_req_t request, const char *, json_object * argsJ);
 PUBLIC int ApiStreamAttach(SoftMixerT *mixer, afb_req_t request, const char * uid, const char *prefix, json_object * argsJ);