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, 55 insertions, 31 deletions

diff --git a/plugins/alsa/alsa-api-ramp.c b/plugins/alsa/alsa-api-ramp.c
index 21ec165..060c917 100644
--- a/plugins/alsa/alsa-api-ramp.c
+++ b/plugins/alsa/alsa-api-ramp.c
@@ -28,20 +28,22 @@
 
 PUBLIC AlsaVolRampT *ApiRampGetByUid(SoftMixerT *mixer, const char *uid) {
     AlsaVolRampT *ramp = NULL;
-
-    // Loop on every Register zone pcm and extract (cardid) from (uid)
-    for (int idx = 0; mixer->ramps[idx]->uid != NULL; idx++) {
-        if (!strcasecmp(mixer->ramps[idx]->uid, uid)) {
-            ramp = mixer->ramps[idx];
-            return ramp;
-        }
+	cds_list_for_each_entry(ramp, &mixer->ramps.list, list) {
+		if (!strcasecmp(ramp->uid, uid))
+			return ramp;
     }
     return NULL;
 }
 
 STATIC AlsaVolRampT *AttachOneRamp(SoftMixerT *mixer, const char *uid, json_object *rampJ) {
-    const char*rampUid;
+	const char * rampUid;
     AlsaVolRampT *ramp = calloc(1, sizeof (AlsaVolRampT));
+	if (ramp == NULL) {
+		SOFTMIXER_NOMEM(mixer->api);
+		goto fail;
+	}
+
+	CDS_INIT_LIST_HEAD(&ramp->list);
 
     int error = wrap_json_unpack(rampJ, "{ss,si,si,si !}"
             , "uid", &rampUid
@@ -50,65 +52,87 @@ STATIC AlsaVolRampT *AttachOneRamp(SoftMixerT *mixer, const char *uid, json_obje
             , "down", &ramp->stepDown
             );
     if (error) {
-        AFB_ApiError(mixer->api, "AttachOneRamp mixer=%s hal=%s error=%s json=%s", mixer->uid, uid, wrap_json_get_error_string(error), json_object_get_string(rampJ));
-        goto OnErrorExit;
+		AFB_ApiError(mixer->api,
+				"%s mixer=%s hal=%s error=%s json=%s",
+				__func__, mixer->uid, uid, wrap_json_get_error_string(error), json_object_get_string(rampJ));
+		goto fail_ramp;
     }
 
     ramp->delay = ramp->delay * 1000; // move from ms to us
     ramp->uid = strdup(rampUid);
+	if (ramp->uid == NULL) {
+		SOFTMIXER_NOMEM(mixer->api);
+		goto fail_ramp;
+	}
+
     return ramp;
 
-OnErrorExit:
+fail_ramp:
     free(ramp);
+fail:
     return NULL;
 }
 
-PUBLIC int ApiRampAttach(SoftMixerT *mixer, AFB_ReqT request, const char *uid, json_object *argsJ) {
-    int index;
 
-    for (index = 0; index < mixer->max.ramps; index++) {
-        if (!mixer->ramps[index]) break;
-    }
+static void rampDestroy(SoftMixerT * mixer, void * arg) {
+	AlsaVolRampT * ramp = (AlsaVolRampT*) arg;
+	AFB_ApiDebug(mixer->api, "%s... %s not implemented", __func__, ramp->uid);
+}
 
-    if (index == mixer->max.ramps) {
-        AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max ramp=%d", mixer->uid, uid, mixer->max.ramps);
-        goto OnErrorExit;
+static AlsaVolRampT * rampCreate(SoftMixerT * mixer, const char * uid, json_object *argsJ) {
+	AlsaVolRampT * newRamp = AttachOneRamp(mixer, uid, argsJ);
+	if (!newRamp) {
+		goto fail;
+	}
+	mixer->nbRamps++;
+	cds_list_add_tail(&newRamp->list, &mixer->ramps.list);
+	AlsaMixerTransactionObjectAdd(mixer->transaction, newRamp, rampDestroy);
+fail:
+	return newRamp;
+}
+
+PUBLIC int ApiRampAttach(SoftMixerT *mixer, AFB_ReqT request, const char * uid, json_object *argsJ) {
+
+	if (mixer->nbRamps >= mixer->max.ramps) {
+		AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max ramp=%d", mixer->uid, uid, mixer->max.ramps);
+		goto fail;
     }
 
+	AlsaVolRampT * newRamp = NULL;
+
     switch (json_object_get_type(argsJ)) {
         long count;
         
         case json_type_object:
-            mixer->ramps[index] = AttachOneRamp(mixer, uid, argsJ);
-            if (!mixer->ramps[index]) {
+			newRamp = rampCreate(mixer, uid, argsJ);
+			if (!newRamp) {
                 AFB_ReqFailF(request, "bad-ramp", "mixer=%s hal=%s invalid ramp= %s", mixer->uid, uid, json_object_get_string(argsJ));
-                goto OnErrorExit;
+				goto fail;
             }
             break;
 
         case json_type_array:
             count = json_object_array_length(argsJ);
-            if (count > (mixer->max.ramps - index)) {
+			if (count > (mixer->max.ramps - mixer->nbRamps)) {
                 AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max ramp=%d", mixer->uid, uid, mixer->max.ramps);
-                goto OnErrorExit;
-
+				goto fail;
             }
 
             for (int idx = 0; idx < count; idx++) {
                 json_object *streamAudioJ = json_object_array_get_idx(argsJ, idx);
-                mixer->ramps[index + idx] = AttachOneRamp(mixer, uid, streamAudioJ);
-                if (!mixer->ramps[index + idx]) {
-                    AFB_ReqFailF(request, "bad-ramp", "mixer=%s hal=%s invalid ramp= %s", mixer->uid, uid, json_object_get_string(streamAudioJ));
-                    goto OnErrorExit;
+				newRamp = rampCreate(mixer, uid, streamAudioJ);
+				if (!newRamp) {
+					AFB_ReqFailF(request, "bad-ramp", "mixer=%s hal=%s invalid ramp= %s", mixer->uid, uid, json_object_get_string(argsJ));
+					goto fail;
                 }
             }
             break;
         default:
             AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s ramps invalid argsJ= %s", mixer->uid, uid, json_object_get_string(argsJ));
-            goto OnErrorExit;
+			goto fail;
     }
     return 0;
 
-OnErrorExit:
+fail:
     return -1;
 }