Add support for bluetooth telephonyguppy_6.99.3guppy/6.99.36.99.3

This adds support for bluetooth telephony.
A big rework in the softmixer internals has been
mandatory, in order to support dynamic streams creation
and deletions.

Bluetooth telephony relies on the recent evolutions
of bluez-alsa, the most important one being the
support of HFP over Ofono. The softmixer opens
PCM ioplugs provided by bluez-alsa.
Bluetooth SCO needs 2 streams, one for listening
and the other for talking. These streams are created
upon requests sent by the hal-manager.
The hal manager subscribes for bluez-alsa events
and request the list of availalble transports.

For each "attach" transaction verb, the softmixer
maintains a list of the all created objects
(sources, sinks, zones, ramps, streams, and more)
Additionnally, it creates a new verb when the attach
succeeds, that verb is typically something like
"sco_XX:XX:XX:XX:XX:XX", and the only supported action
at the present time is {"action":"remove"}, that performs
all the cleanup of the registered objects.

Change-Id: I1b119e6c079e60daf771e63c083a1ef33a39f379
Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>

1 files changed, 37 insertions, 0 deletions

diff --git a/plugins/alsa/alsa-transaction.h b/plugins/alsa/alsa-transaction.h
new file mode 100644
index 0000000..a0af0ae
--- /dev/null
+++ b/plugins/alsa/alsa-transaction.h
@@ -0,0 +1,37 @@
+#ifndef __INC_ALSA_TRANSACTION_H
+#define __INC_ALSA_TRANSACTION_H
+
+#include <urcu/list.h>
+#include <stdbool.h>
+
+#include "afb-definitions.h"
+
+struct SoftMixerT_;
+
+typedef void (*AlsaTransactionDestructor) (struct SoftMixerT_ *, void*);
+
+typedef struct {
+	const char * uid;
+	struct SoftMixerT_*  mixer;
+	struct cds_list_head list;
+} AlsaMixerTransaction;
+
+typedef struct {
+	struct cds_list_head list_entry;
+	void * object;
+	AlsaTransactionDestructor destructor;
+} AlsaMixerTransactionDataItem;
+
+extern AlsaMixerTransaction * AlsaMixerTransactionNew(struct SoftMixerT_ * api, const char*);
+
+extern void AlsaMixerTransactionDataListDestroy(AlsaMixerTransaction*);
+
+extern bool AlsaMixerTransactionObjectAdd(AlsaMixerTransaction*, void * object, AlsaTransactionDestructor destructor);
+
+extern void AlsaMixerTransactionDoCleanup(AlsaMixerTransaction*);
+
+extern bool AlsaMixerTransactionVerbCreate(AlsaMixerTransaction*);
+
+extern void AlsaMixerTransactionVerbCB(AFB_ReqT request);
+
+#endif /* __INC_ALSA_TRANSACTION_H */