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-rw-r--r--plugins/alsa/alsa-api-frontend.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-api-frontend.c b/plugins/alsa/alsa-api-frontend.c
new file mode 100644
index 0000000..c01a88b
--- /dev/null
+++ b/plugins/alsa/alsa-api-frontend.c
@@ -0,0 +1,179 @@
+/*
+ * 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>
+
+// Fulup need to be cleanup with new controller version
+extern Lua2cWrapperT Lua2cWrap;
+
+STATIC int ProcessOneSubdev(CtlSourceT *source, AlsaSndLoopT *loop, json_object *subdevJ, AlsaPcmHwInfoT *loopDefParams,AlsaPcmInfoT *subdev) {
+ json_object *paramsJ = NULL;
+
+ int error = wrap_json_unpack(subdevJ, "{si,si,s?o !}", "subdev", &subdev->subdev, "numid", &subdev->numid, "params", &paramsJ);
+ if (error) {
+ AFB_ApiError(source->api, "ProcessOneSubdev: loop=%s missing (uid|subdev|numid) json=%s", loop->uid, json_object_get_string(subdevJ));
+ goto OnErrorExit;
+ }
+
+ if (paramsJ) {
+ error = ProcessSndParams(source, loop->uid, paramsJ, loopDefParams);
+ if (error) {
+ AFB_ApiError(source->api, "ProcessOneLoop: sndcard=%s invalid params=%s", loop->uid, json_object_get_string(paramsJ));
+ goto OnErrorExit;
+ }
+ } else {
+ // use global loop params definition as default
+ memcpy (&subdev->params, loopDefParams, sizeof(AlsaPcmHwInfoT));
+ }
+ // create a fake uid and complete subdev info from loop handle
+ char subuid[30];
+ snprintf(subuid, sizeof (subuid), "loop:/%i/%i", subdev->subdev, subdev->numid);
+ subdev->uid = strdup(subuid);
+ subdev->device = loop->capture; // Fulup: with alsaloop softmixer only use capture device (playback is used by applications)
+ subdev->devpath = loop->devpath;
+ subdev->cardid = NULL; // force AlsaByPathDevId to rebuild a new one for each subdev
+ subdev->cardidx = loop->cardidx;
+
+ // check if card exist
+ error = AlsaByPathDevid(source, subdev);
+ if (error) {
+ AFB_ApiError(source->api, "ProcessOneSubdev: loop=%s fail to open subdev=%s", loop->uid, json_object_get_string(subdevJ));
+ goto OnErrorExit;
+ }
+
+ return 0;
+
+OnErrorExit:
+ return -1;
+}
+
+STATIC int ProcessOneLoop(CtlSourceT *source, json_object *loopJ, AlsaSndLoopT *loop) {
+ json_object *subdevsJ = NULL, *devicesJ = NULL, *paramsJ = NULL;
+ int error;
+
+ error = wrap_json_unpack(loopJ, "{ss,s?s,s?s,s?i,s?o,so,s?o !}", "uid", &loop->uid, "devpath", &loop->devpath, "cardid", &loop->cardid
+ , "cardidx", &loop->cardidx, "devices", &devicesJ, "subdevs", &subdevsJ, "params", &paramsJ);
+ if (error || !loop->uid || !subdevsJ || (!loop->devpath && !loop->cardid && loop->cardidx)) {
+ AFB_ApiNotice(source->api, "ProcessOneLoop missing 'uid|devpath|cardid|cardidx|devices|subdevs' loop=%s", json_object_get_string(loopJ));
+ goto OnErrorExit;
+ }
+
+ AlsaPcmHwInfoT *loopDefParams =alloca(sizeof(AlsaPcmHwInfoT));
+ if (paramsJ) {
+ error = ProcessSndParams(source, loop->uid, paramsJ, loopDefParams);
+ if (error) {
+ AFB_ApiError(source->api, "ProcessOneLoop: sndcard=%s invalid params=%s", loop->uid, json_object_get_string(paramsJ));
+ goto OnErrorExit;
+ }
+ } else {
+ loopDefParams->rate = ALSA_DEFAULT_PCM_RATE;
+ loopDefParams->rate= ALSA_DEFAULT_PCM_RATE;
+ loopDefParams->access=SND_PCM_ACCESS_RW_INTERLEAVED;
+ loopDefParams->format=SND_PCM_FORMAT_S16_LE;
+ loopDefParams->channels=2;
+ loopDefParams->sampleSize=0;
+ }
+
+ // make sure useful information will not be removed
+ loop->uid = strdup(loop->uid);
+ if (loop->cardid) loop->cardid = strdup(loop->cardid);
+ if (loop->devpath) loop->cardid = strdup(loop->devpath);
+
+ // 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(source->api, "ProcessOneLoop=%s missing 'capture|playback' devices=%s", loop->uid, json_object_get_string(devicesJ));
+ goto OnErrorExit;
+ }
+ }
+
+ switch (json_object_get_type(subdevsJ)) {
+ case json_type_object:
+ loop->scount = 1;
+ loop->subdevs = calloc(loop->scount + 1, sizeof (AlsaPcmInfoT));
+ error = ProcessOneSubdev(source, loop, subdevsJ, loopDefParams, &loop->subdevs[0]);
+ if (error) goto OnErrorExit;
+ break;
+ case json_type_array:
+ loop->scount = (int) json_object_array_length(subdevsJ);
+ loop->subdevs = calloc(loop->scount + 1, sizeof (AlsaPcmInfoT));
+ for (int idx = 0; idx < loop->scount; idx++) {
+ json_object *subdevJ = json_object_array_get_idx(subdevsJ, idx);
+ error = ProcessOneSubdev(source, loop, subdevJ, loopDefParams, &loop->subdevs[idx]);
+ if (error) goto OnErrorExit;
+ }
+ break;
+ default:
+ AFB_ApiError(source->api, "ProcessOneLoop=%s invalid subdevs= %s", loop->uid, json_object_get_string(subdevsJ));
+ goto OnErrorExit;
+ }
+
+ return 0;
+
+OnErrorExit:
+ return -1;
+}
+
+PUBLIC int SndFrontend (CtlSourceT *source, json_object *argsJ) {
+ SoftMixerHandleT *mixerHandle = (SoftMixerHandleT*) source->context;
+ int error;
+
+ assert (mixerHandle);
+
+ if (mixerHandle->loop) {
+ AFB_ApiError(source->api, "SndFrontend: mixer=%s SndFrontend already declared %s", mixerHandle->uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+ mixerHandle->loop= calloc(1, sizeof (AlsaSndLoopT));
+
+ // or syntax purpose array is accepted but frontend should have a single driver entry
+ json_type type= json_object_get_type(argsJ);
+ if (type == json_type_array) {
+ size_t count= json_object_array_length(argsJ);
+ if (count != 1) {
+ AFB_ApiError(source->api, "SndFrontend: mixer=%s frontend only support on input driver args=%s", mixerHandle->uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+ argsJ= json_object_array_get_idx(argsJ,0);
+ }
+
+ type= json_object_get_type(argsJ);
+ if (type != json_type_object) {
+ AFB_ApiError(source->api, "SndFrontend: mixer=%s invalid object type= %s", mixerHandle->uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+ error = ProcessOneLoop(source, argsJ, mixerHandle->loop);
+ if (error) {
+ AFB_ApiError(source->api, "SndFrontend: mixer=%s invalid object= %s", mixerHandle->uid, json_object_get_string(argsJ));
+ goto OnErrorExit;
+ }
+
+ return 0;
+
+OnErrorExit:
+ return -1;
+} \ No newline at end of file