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-rw-r--r--plugins/alsa/alsa-api-loop.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-api-loop.c b/plugins/alsa/alsa-api-loop.c
new file mode 100644
index 0000000..9a746ea
--- /dev/null
+++ b/plugins/alsa/alsa-api-loop.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright (C) 2018 "IoT.bzh"
+ * Author Fulup Ar Foll <fulup@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#define _GNU_SOURCE // needed for vasprintf
+
+#include "alsa-softmixer.h"
+#include <string.h>
+
+PUBLIC AlsaLoopSubdevT *ApiLoopFindSubdev(SoftMixerT *mixer, const char *streamUid, const char *targetUid, AlsaSndLoopT **loop) {
+
+ // Either allocate a free loop subdev or search for a specific targetUid when specified
+ if (targetUid) {
+ for (int idx = 0; mixer->loops[idx]; idx++) {
+ for (int jdx = 0; jdx < mixer->loops[idx]->scount; jdx++) {
+ if (mixer->loops[idx]->subdevs[jdx]->uid && !strcasecmp(mixer->loops[idx]->subdevs[jdx]->uid, targetUid)) {
+ *loop = mixer->loops[idx];
+ return mixer->loops[idx]->subdevs[jdx];
+ }
+ }
+ }
+ } else {
+ for (int idx = 0; mixer->loops[idx]; idx++) {
+ for (int jdx = 0; mixer->loops[idx]->subdevs[jdx]; jdx++) {
+ if (!mixer->loops[idx]->subdevs[jdx]->uid) {
+ mixer->loops[idx]->subdevs[jdx]->uid = streamUid;
+ *loop = mixer->loops[idx];
+ return mixer->loops[idx]->subdevs[jdx];
+ }
+ }
+ }
+ }
+ return NULL;
+}
+
+STATIC AlsaLoopSubdevT *ProcessOneSubdev(SoftMixerT *mixer, AlsaSndLoopT *loop, json_object *subdevJ) {
+ AlsaLoopSubdevT *subdev = calloc(1, sizeof (AlsaPcmCtlT));
+
+ int error = wrap_json_unpack(subdevJ, "{s?s, si,si,s?o !}"
+ , "uid", &subdev->uid
+ , "subdev", &subdev->index
+ , "numid", &subdev->numid
+ );
+ if (error) {
+ AFB_ApiError(mixer->api, "ProcessOneSubdev: loop=%s missing (uid|subdev|numid) error=%s json=%s", loop->uid, wrap_json_get_error_string(error),json_object_get_string(subdevJ));
+ goto OnErrorExit;
+ }
+
+ // subdev with no UID are dynamically attached
+ if (subdev->uid) subdev->uid = strdup(subdev->uid);
+
+ // create loop subdev entry point with cardidx+device+subdev in order to open subdev and not sndcard
+ AlsaDevInfoT loopSubdev;
+ loopSubdev.devpath=NULL;
+ loopSubdev.cardid=NULL;
+ loopSubdev.cardidx = loop->sndcard->cid.cardidx;
+ loopSubdev.device = loop->capture;
+ loopSubdev.subdev = subdev->index;
+
+ // assert we may open this loopback subdev in capture mode
+ AlsaPcmCtlT *pcmInfo = AlsaByPathOpenPcm(mixer, &loopSubdev, SND_PCM_STREAM_CAPTURE);
+ if (!pcmInfo) goto OnErrorExit;
+
+ // free PCM as we only open loop to assert it's a valid capture device
+ snd_pcm_close(pcmInfo->handle);
+ free(pcmInfo);
+
+ return subdev;
+
+OnErrorExit:
+ return NULL;
+}
+
+STATIC AlsaSndLoopT *AttachOneLoop(SoftMixerT *mixer, const char *uid, json_object *argsJ) {
+ AlsaSndLoopT *loop = calloc(1, sizeof (AlsaSndLoopT));
+ json_object *subdevsJ = NULL, *devicesJ = NULL;
+ int error;
+
+ loop->sndcard = (AlsaSndCtlT*) calloc(1, sizeof (AlsaSndCtlT));
+ error = wrap_json_unpack(argsJ, "{ss,s?s,s?s,so,so !}"
+ , "uid", &loop->uid
+ , "path", &loop->sndcard->cid.devpath
+ , "cardid", &loop->sndcard->cid.cardid
+ , "devices", &devicesJ
+ , "subdevs", &subdevsJ
+ );
+ if (error || !loop->uid || !subdevsJ || (!loop->sndcard->cid.devpath && !loop->sndcard->cid.cardid)) {
+ AFB_ApiNotice(mixer->api, "AttachOneLoop mixer=%s hal=%s missing 'uid|path|cardid|devices|subdevs' error=%s args=%s", mixer->uid, uid, wrap_json_get_error_string(error),json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+ // try to open sound card control interface
+ loop->sndcard->ctl = AlsaByPathOpenCtl(mixer, loop->uid, loop->sndcard);
+ if (!loop->sndcard->ctl) {
+ AFB_ApiError(mixer->api, "AttachOneLoop mixer=%s hal=%s Fail open sndcard loop=%s devpath=%s cardid=%s (please check 'modprobe snd_aloop')", mixer->uid, uid, loop->uid, loop->sndcard->cid.devpath, loop->sndcard->cid.cardid);
+ goto OnErrorExit;
+ }
+
+ // Default devices is payback=0 capture=1
+ if (!devicesJ) {
+ loop->playback = 0;
+ loop->capture = 1;
+ } else {
+ error = wrap_json_unpack(devicesJ, "{si,si !}", "capture", &loop->capture, "playback", &loop->playback);
+ if (error) {
+ AFB_ApiNotice(mixer->api, "AttachOneLoop mixer=%s hal=%s Loop=%s missing 'capture|playback' error=%s devices=%s", mixer->uid, uid, loop->uid, wrap_json_get_error_string(error),json_object_get_string(devicesJ));
+ goto OnErrorExit;
+ }
+ }
+
+ switch (json_object_get_type(subdevsJ)) {
+ case json_type_object:
+ loop->scount = 1;
+ loop->subdevs = calloc(2, sizeof (void*));
+ loop->subdevs[0] = ProcessOneSubdev(mixer, loop, subdevsJ);
+ if (!loop->subdevs[0]) goto OnErrorExit;
+ break;
+ case json_type_array:
+ loop->scount = (int) json_object_array_length(subdevsJ);
+ loop->subdevs = calloc(loop->scount + 1, sizeof (void*));
+ for (int idx = 0; idx < loop->scount; idx++) {
+ json_object *subdevJ = json_object_array_get_idx(subdevsJ, idx);
+ loop->subdevs[idx] = ProcessOneSubdev(mixer, loop, subdevJ);
+ if (!loop->subdevs[idx]) goto OnErrorExit;
+ }
+ break;
+ default:
+ AFB_ApiError(mixer->api, "AttachOneLoop mixer=%s hal=%s Loop=%s invalid subdevs= %s", mixer->uid, uid, loop->uid, json_object_get_string(subdevsJ));
+ goto OnErrorExit;
+ }
+
+ // we may have to register up to 3 control per subdevice (vol, pause, actif)
+ loop->sndcard->registry = calloc(loop->scount * SMIXER_SUBDS_CTLS + 1, sizeof (RegistryEntryPcmT));
+ loop->sndcard->rcount = loop->scount*SMIXER_SUBDS_CTLS;
+
+ return loop;
+
+OnErrorExit:
+ return NULL;
+}
+
+PUBLIC int ApiLoopAttach(SoftMixerT *mixer, AFB_ReqT request, const char *uid, json_object * argsJ) {
+
+ int index;
+ for (index = 0; index < mixer->max.loops; index++) {
+ if (!mixer->loops[index]) break;
+ }
+
+ if (index == mixer->max.loops) {
+ AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max loop=%d argsJ= %s", mixer->uid, uid, mixer->max.loops, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+ switch (json_object_get_type(argsJ)) {
+ size_t count;
+
+ case json_type_object:
+ mixer->loops[index] = AttachOneLoop(mixer, uid, argsJ);
+ if (!mixer->loops[index]) {
+ AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s invalid loop= %s", mixer->uid, uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+ break;
+
+ case json_type_array:
+ count = json_object_array_length(argsJ);
+ if (count > (mixer->max.loops - count)) {
+ AFB_ReqFailF(request, "too-small", "mixer=%s hal=%s max loop=%d argsJ= %s", mixer->uid, uid, mixer->max.loops, json_object_get_string(argsJ));
+ goto OnErrorExit;
+
+ }
+
+ for (int idx = 0; idx < count; idx++) {
+ json_object *loopJ = json_object_array_get_idx(argsJ, idx);
+ mixer->loops[index + idx] = AttachOneLoop(mixer, uid, loopJ);
+ if (!mixer->loops[index + idx]) {
+ AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s invalid loop= %s", mixer->uid, uid, json_object_get_string(loopJ));
+ goto OnErrorExit;
+ }
+ }
+ break;
+ default:
+ AFB_ReqFailF(request, "invalid-syntax", "mixer=%s hal=%s loops invalid argsJ= %s", mixer->uid, uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+ return 0;
+
+OnErrorExit:
+ return -1;
+} \ No newline at end of file