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, 91 insertions, 62 deletions

diff --git a/plugins/alsa/alsa-api-sink.c b/plugins/alsa/alsa-api-sink.c
index 96437f5..a1137c5 100644
--- a/plugins/alsa/alsa-api-sink.c
+++ b/plugins/alsa/alsa-api-sink.c
@@ -24,106 +24,135 @@ PUBLIC AlsaPcmHwInfoT *ApiSinkGetParamsByZone(SoftMixerT *mixer, const char *tar
 
     // try to attach a zone as stream playback sink
     AlsaSndZoneT *zone = ApiZoneGetByUid(mixer, target);
-    if (zone && zone->sinks) {
 
-        // use 1st channel to find attached sound card.
-        const char *channel = zone->sinks[0]->uid;
-
-        // search for channel uid into mixer sinks and derive sound card
-        for (int idx = 0; mixer->sinks[idx]; idx++) {
-            for (int jdx = 0; jdx < mixer->sinks[idx]->ccount; jdx++) {
-                if (mixer->sinks[idx]->channels[jdx]->uid && !strcasecmp(channel, mixer->sinks[idx]->channels[jdx]->uid)) {
-                    return mixer->sinks[idx]->sndcard->params;
-                }
-            }
-        }
+	if (!zone) {
+		AFB_ApiError(mixer->api, "%s: Unable to find zone %s", __func__, target);
+		goto fail;
+	}
+	if (zone->nbSinks == 0) {
+		AFB_ApiError(mixer->api, "%s: Zone %s has no sinks", __func__, target);
+		goto fail;
+	}
+
+	// use 1st channel to find attached sound card.
+	AlsaPcmChannelT * pcmChannel = cds_list_first_entry(&zone->sinks.list, AlsaPcmChannelT , list);
+	const char *channel = pcmChannel->uid;
+
+	AFB_ApiDebug(mixer->api, "%s: first channel uid is %s, zone has %d sinks", __func__, channel, zone->nbSinks);
+
+	AlsaSndPcmT * sink = NULL;
+
+	cds_list_for_each_entry(sink, &mixer->sinks.list, list) {
+		AlsaPcmChannelT * pcmChannel;
+		cds_list_for_each_entry(pcmChannel, &sink->channels.list, list) {
+			if (pcmChannel->uid && !strcasecmp(channel, pcmChannel->uid)) {
+				AFB_ApiDebug(mixer->api, "%s: found %s, return", __func__, pcmChannel->uid);
+				return sink->sndcard->params;
+			}
+		}
     }
+
+fail:
     return NULL;
 }
 
 PUBLIC AlsaSndPcmT  *ApiSinkGetByUid(SoftMixerT *mixer, const char *target) {
     // if no attached zone found, then try direct sink attachment
-    for (int idx = 0; mixer->sinks[idx]; idx++) {
-        if (mixer->sinks[idx]->uid && !strcasecmp(mixer->sinks[idx]->uid, target)) {
-            return mixer->sinks[idx];
-        }
-    }
+	AlsaSndPcmT * sink;
+	cds_list_for_each_entry(sink, &mixer->sinks.list, list) {
+		if (sink->uid && !strcasecmp(sink->uid, target))
+			return sink;
+	}
     
     return NULL;
 }
 
-PUBLIC int ApiSinkAttach(SoftMixerT *mixer, AFB_ReqT request, const char *uid, json_object * argsJ) {
+static void sinkDestroy(SoftMixerT* mixer, void * arg) {
+	AlsaSndPcmT * sink = (AlsaSndPcmT*) arg;
+	AFB_ApiDebug(mixer->api, "%s... %s", __func__, sink->uid);
 
-    int index;
-    char *dmixUid = NULL;
+	cds_list_del(&sink->list);
+	mixer->nbSinks--;
+	ApiPcmDelete(mixer, sink);
+}
 
-    for (index = 0; index < mixer->max.sinks; index++) {
-        if (!mixer->sinks[index]) break;
+AlsaSndPcmT * sinkCreate(SoftMixerT * mixer, AFB_ReqT request, const char * uid, json_object * argsJ) {
+	AlsaPcmCtlT* dmixConfig = NULL;
+	char *dmixUid = NULL;
+	AlsaSndPcmT * newSink = ApiPcmAttachOne(mixer, uid, SND_PCM_STREAM_PLAYBACK, argsJ);
+	if (!newSink) {
+		goto fail;
+	}
+	/* DMIX only supports REAL hardware */
+	if (!newSink->isPcmPlug)  {
+		// move from hardware to DMIX attach to sndcard
+		if (asprintf(&dmixUid, "dmix-%s", newSink->uid) == -1) {
+			SOFTMIXER_NOMEM(mixer->api);
+			goto fail_pcm;
+		}
+		dmixConfig = AlsaCreateDmix(mixer, dmixUid, newSink, 0);
+		if (!dmixConfig) {
+			AFB_ReqFailF(request, "internal-error", "mixer=%s sink=%s fail to create DMIX config", mixer->uid, newSink->uid);
+			goto fail_dmix;
+		}
     }
 
-    if (index == mixer->max.sinks) {
+	mixer->nbSinks++;
+	cds_list_add_tail(&newSink->list, &mixer->sinks.list);
+	AlsaMixerTransactionObjectAdd(mixer->transaction, newSink, sinkDestroy);
+
+	return newSink;
+fail:
+fail_pcm:
+	// TODO delete PCM
+fail_dmix:
+	free(dmixUid);
+	return NULL;
+}
+
+
+PUBLIC int ApiSinkAttach(SoftMixerT *mixer, AFB_ReqT request, const char * uid, json_object * argsJ) {
+
+	if (mixer->nbSinks >= mixer->max.sinks) {
         AFB_ReqFailF(request, "too-small", "mixer=%s max sink=%d", mixer->uid, mixer->max.sinks);
-        goto OnErrorExit;
+		goto fail;
     }
 
     switch (json_object_get_type(argsJ)) {
-            long count;
-
-            AlsaPcmCtlT* dmixConfig;
+		long count;
 
-        case json_type_object:
-            mixer->sinks[index] = ApiPcmAttachOne(mixer, uid, SND_PCM_STREAM_PLAYBACK, argsJ);
-            if (!mixer->sinks[index]) {
+		case json_type_object: {
+			AlsaSndPcmT * newSink = sinkCreate(mixer, request, uid, argsJ);
+			if (!newSink) {
                 AFB_ReqFailF(request, "bad-pcm", "mixer=%s invalid sink= %s", mixer->uid, json_object_get_string(argsJ));
-                goto OnErrorExit;
-            }
-
-            // move from hardware to DMIX attach to sndcard
-            if (asprintf(&dmixUid, "dmix-%s", mixer->sinks[index]->uid) == -1)
-                goto OnErrorExit;
-
-            dmixConfig = AlsaCreateDmix(mixer, dmixUid, mixer->sinks[index], 0);
-            if (!dmixConfig) {
-                AFB_ReqFailF(request, "internal-error", "mixer=%s sink=%s fail to create DMIX config", mixer->uid, mixer->sinks[index]->uid);
-                goto OnErrorExit;
+				goto fail;
             }
-
             break;
-
-        case json_type_array:
+		}
+		case json_type_array: {
             count = json_object_array_length(argsJ);
-            if (count > (mixer->max.sinks - index)) {
+			if (count > (mixer->max.sinks - mixer->nbSinks)) {
                 AFB_ReqFailF(request, "too-small", "mixer=%s max sink=%d", mixer->uid, mixer->max.sinks);
-                goto OnErrorExit;
+				goto fail;
             }
 
             for (int idx = 0; idx < count; idx++) {
                 json_object *sinkJ = json_object_array_get_idx(argsJ, idx);
-                AlsaSndPcmT * pcm = ApiPcmAttachOne(mixer, uid, SND_PCM_STREAM_PLAYBACK, sinkJ);
-                if (!pcm) {
+				AlsaSndPcmT * newSink = sinkCreate(mixer, request, uid, sinkJ);
+				if (!newSink) {
                     AFB_ReqFailF(request, "bad-pcm", "mixer=%s invalid sink= %s", mixer->uid, json_object_get_string(sinkJ));
-                    goto OnErrorExit;
+					goto fail;
                 }
-                // move from hardware to DMIX attach to sndcard
-                if (asprintf(&dmixUid, "dmix-%s", pcm->uid) == -1)
-                    goto OnErrorExit;
-
-                dmixConfig = AlsaCreateDmix(mixer, dmixUid, pcm, 0);
-                if (!dmixConfig) {
-                    AFB_ReqFailF(request, "internal-error", "mixer=%s sink=%s fail to create DMIX config", mixer->uid, pcm->uid);
-                    goto OnErrorExit;
-                }
-                mixer->sinks[index + idx] = pcm;
             }
             break;
+		}
         default:
             AFB_ReqFailF(request, "invalid-syntax", "mixer=%s sinks invalid argsJ= %s", mixer->uid, json_object_get_string(argsJ));
-            goto OnErrorExit;
+			goto fail;
     }
 
     return 0;
 
-OnErrorExit:
-	free(dmixUid);
+fail:
     return -1;
 }