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-rw-r--r--ALSA-afb/AlsaUseCase.c433
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diff --git a/ALSA-afb/AlsaUseCase.c b/ALSA-afb/AlsaUseCase.c
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+/*
+ * AlsaUseCase -- provide low level interface with ALSA lib (extracted from alsa-json-gateway code)
+ * Copyright (C) 2015,2016,2017, 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.
+
+ References:
+ http://www.alsa-project.org/alsa-doc/alsa-lib/group__ucm.html
+ https://www.alsa-project.org/main/index.php/DAPM
+ http://alsa-lib.sourcearchive.com/documentation/1.0.24.1-2/group__Use_ga4332c6bb50481bbdaf21be11551fb930.html
+ https://android.googlesource.com/platform/hardware/qcom/audio/+/jb-mr1-dev/libalsa-intf/alsa_ucm.h
+
+ Sample alsaucm commands using /usr/share/alsa/ucm/PandaBoard
+ - alsaucm -c PandaBoard list _verbs
+ - alsaucm -c PandaBoard list _devices/HiFi
+ - alsaucm -c PandaBoard list _modifiers/HiFi #need to uncomment modifiers section
+ - alsaucm -c PandaBoard list TQ/HiFi
+ - alsaucm -c PandaBoard get TQ/HiFi/Voice
+ - alsaucm -c PandaBoard get PlaybackPCM//HiFi
+ - alsaucm -c PandaBoard set _verb HiFi
+ - alsaucm -c PandaBoard set _verb HiFi _enadev Headset
+ - alsaucm -c 'HDA Intel PCH' set _verb HiFi set _enadev Headphone set _enamod RecordMedia
+ - alsaucm -c 'HDA Intel PCH' set _verb HiFi get OutputDspName//
+
+*/
+#define _GNU_SOURCE // needed for vasprintf
+
+#include <alsa/asoundlib.h>
+#include "AlsaCoreBinding.h"
+#include <alsa/asoundlib.h>
+#include <alsa/use-case.h>
+
+typedef struct {
+ snd_use_case_mgr_t *ucm;
+ int cardId;
+ char *cardName;
+} ucmHandleT;
+
+static ucmHandleT ucmHandles[MAX_SND_CARD];
+
+// Cache opened UCM handles
+STATIC int alsaUseCaseOpen (struct afb_req request, queryValuesT *queryValues, int allowNewMgr) {
+ snd_ctl_t *ctlDev;
+ snd_ctl_card_info_t *cardinfo;
+ snd_use_case_mgr_t *ucmHandle;
+ const char *cardName;
+ int cardId, idx, idxFree=-1, err;
+
+ // open control interface for devid
+ err = snd_ctl_open(&ctlDev, queryValues->devid, SND_CTL_READONLY);
+ if (err < 0) {
+ ctlDev=NULL;
+ afb_req_fail_f (request, "devid-unknown", "SndCard devid=[%s] Not Found err=%d", queryValues->devid, err);
+ goto OnErrorExit;
+ }
+
+ snd_ctl_card_info_alloca(&cardinfo);
+ if ((err = snd_ctl_card_info(ctlDev, cardinfo)) < 0) {
+ afb_req_fail_f (request, "devid-invalid", "SndCard devid=[%s] Not Found err=%s", queryValues->devid, snd_strerror(err));
+ goto OnErrorExit;
+ }
+
+ // search for an existing subscription and mark 1st free slot
+ cardId = snd_ctl_card_info_get_card(cardinfo);
+ for (idx= 0; idx < MAX_SND_CARD; idx ++) {
+ if (ucmHandles[idx].ucm != NULL) {
+ if (ucmHandles[idx].cardId == cardId) goto OnSuccessExit;
+ } else if (idxFree == -1) idxFree= idx;
+ };
+
+ if (!allowNewMgr) {
+ afb_req_fail_f (request, "ucm-nomgr", "SndCard devid=[%s] no exiting UCM manager session", queryValues->devid);
+ goto OnErrorExit;
+ }
+
+ if (idxFree < 0 && idx == MAX_SND_CARD) {
+ afb_req_fail_f (request, "ucm-toomany", "SndCard devid=[%s] too many open UCM Max=%d", queryValues->devid, MAX_SND_CARD);
+ goto OnErrorExit;
+ }
+
+ idx = idxFree;
+ cardName = snd_ctl_card_info_get_name(cardinfo);
+ err = snd_use_case_mgr_open(&ucmHandle, cardName);
+ if (err) {
+ afb_req_fail_f (request, "ucm-open", "SndCard devid=[%s] name=[%s] No UCM Profile err=%s", queryValues->devid, cardName, snd_strerror(err));
+ goto OnErrorExit;
+ }
+ ucmHandles[idx].ucm = ucmHandle;
+ ucmHandles[idx].cardId = cardId;
+ ucmHandles[idx].cardName = strdup(cardName);
+
+ OnSuccessExit:
+ if (ctlDev) snd_ctl_close(ctlDev);
+ return idx;
+
+ OnErrorExit:
+ if (ctlDev) snd_ctl_close(ctlDev);
+ return -1;
+}
+
+
+PUBLIC void alsaUseCaseQuery(struct afb_req request) {
+ int err, verbCount, ucmIdx;
+ const char **verbList;
+ snd_use_case_mgr_t *ucmHandle;
+ queryValuesT queryValues;
+ json_object *ucmJs;
+ const char *cardName;
+
+
+ err = alsaCheckQuery (request, &queryValues);
+ if (err) goto OnErrorExit;
+
+ ucmIdx = alsaUseCaseOpen (request, &queryValues, TRUE);
+ if (ucmIdx < 0) goto OnErrorExit;
+ ucmHandle = ucmHandles [ucmIdx].ucm;
+ cardName = ucmHandles [ucmIdx].cardName;
+
+ verbCount = snd_use_case_get_list (ucmHandle, "_verbs", &verbList);
+ if (verbCount < 0) {
+ afb_req_fail_f (request, "ucm-list", "SndCard devid=[%s] name=[%s] No UCM Verbs", queryValues.devid, cardName);
+ goto OnErrorExit;
+ }
+
+ ucmJs = json_object_new_array();
+ for (int idx=0; idx < verbCount; idx +=2) {
+ int devCount, modCount, tqCount;
+ const char **devList, **modList, **tqList;
+ json_object *ucmJ = json_object_new_object();
+ char identifier[32];
+
+ json_object_object_add (ucmJ, "verb", json_object_new_string(verbList[idx]));
+ if (verbList[idx+1]) json_object_object_add (ucmJ, "info", json_object_new_string(verbList[idx+1]));
+
+ DEBUG (afbIface, "Verb[%d] Action=%s Info=%s", idx, verbList[idx], verbList[idx+1]);
+
+ snprintf (identifier, sizeof(identifier), "_devices/%s", verbList[idx]);
+ devCount = snd_use_case_get_list (ucmHandle, identifier, &devList);
+ if (devCount > 0) {
+ json_object *devsJ = json_object_new_array();
+
+ for (int jdx=0; jdx < devCount; jdx+=2) {
+ json_object *devJ = json_object_new_object();
+ DEBUG (afbIface, "device[%d] Action=%s Info=%s", jdx, devList[jdx], devList[jdx+1]);
+ json_object_object_add (devJ, "dev", json_object_new_string(devList[jdx]));
+ if (devList[jdx+1]) json_object_object_add (devJ, "info", json_object_new_string(devList[jdx+1]));
+ json_object_array_add (devsJ, devJ);
+ }
+ json_object_object_add(ucmJ,"devices", devsJ);
+ snd_use_case_free_list(devList, err);
+ }
+
+ snprintf (identifier, sizeof(identifier), "_modifiers/%s", verbList[idx]);
+ modCount = snd_use_case_get_list (ucmHandle, identifier, &modList);
+ if (modCount > 0) {
+ json_object *modsJ = json_object_new_array();
+
+ for (int jdx=0; jdx < modCount; jdx+=2) {
+ json_object *modJ = json_object_new_object();
+ DEBUG (afbIface, "modifier[%d] Action=%s Info=%s", jdx, modList[jdx], modList[jdx+1]);
+ json_object_object_add (modJ, "mod", json_object_new_string(modList[jdx]));
+ if (modList[jdx+1]) json_object_object_add (modJ, "info", json_object_new_string(modList[jdx+1]));
+ json_object_array_add (modsJ, modJ);
+ }
+ json_object_object_add(ucmJ,"modifiers", modsJ);
+ snd_use_case_free_list(modList, err);
+ }
+
+ snprintf (identifier, sizeof(identifier), "TQ/%s", verbList[idx]);
+ tqCount = snd_use_case_get_list (ucmHandle, identifier, &tqList);
+ if (tqCount > 0) {
+ json_object *tqsJ = json_object_new_array();
+
+ for (int jdx=0; jdx < tqCount; jdx+=2) {
+ json_object *tqJ = json_object_new_object();
+ DEBUG (afbIface, "toneqa[%d] Action=%s Info=%s", jdx, tqList[jdx], tqList[jdx+1]);
+ json_object_object_add (tqJ, "tq", json_object_new_string(tqList[jdx]));
+ if (tqList[jdx+1]) json_object_object_add (tqJ, "info", json_object_new_string(tqList[jdx+1]));
+ json_object_array_add (tqsJ, tqJ);
+ }
+ json_object_object_add(ucmJ,"tqs", tqsJ);
+ snd_use_case_free_list(tqList, err);
+ }
+
+ json_object_array_add (ucmJs, ucmJ);
+ }
+
+ afb_req_success (request, ucmJs, NULL);
+ snd_use_case_free_list(verbList, err);
+
+ OnErrorExit:
+ return;
+}
+
+STATIC json_object *ucmGetValue (ucmHandleT *ucmHandle, const char *verb, const char *mod, const char *label) {
+ char identifier[80];
+ char *value;
+ int err;
+ json_object *jValue;
+
+ // handle optional parameters
+ if (!mod) mod="";
+ if (!verb) verb="";
+
+ if (!label) {
+ NOTICE (afbIface, "ucmGetValue cardname=[%s] value label missing", ucmHandle->cardName);
+ goto OnErrorExit;
+ }
+
+ snprintf (identifier, sizeof(identifier), "%s/%s/%s", label, mod, verb);
+ err = snd_use_case_get (ucmHandle->ucm, identifier, (const char**)&value); // Note: value casting is a known "FEATURE" of AlsaUCM API
+ if (err) {
+ DEBUG (afbIface, "ucmGetValue cardname=[%s] identifier=[%s] error=%s", ucmHandle->cardName, identifier, snd_strerror (err));
+ goto OnErrorExit;
+ }
+
+ // copy value into json object and free string
+ jValue = json_object_new_string (value);
+ free (value);
+ return (jValue);
+
+ OnErrorExit:
+ return (NULL);
+}
+
+PUBLIC void alsaUseCaseGet (struct afb_req request) {
+ int err, ucmIdx, labelCount;
+ queryValuesT queryValues;
+ json_object *jResponse = json_object_new_object();
+ json_object *jWarnings = json_object_new_array();
+ const char *warnings=NULL;
+
+ err = alsaCheckQuery (request, &queryValues);
+ if (err) goto OnErrorExit;
+
+ ucmIdx = alsaUseCaseOpen (request, &queryValues, TRUE);
+ if (ucmIdx < 0) goto OnErrorExit;
+
+ const char *cardName= ucmHandles[ucmIdx].cardName;
+
+ const char *verb = afb_req_value(request, "verb");
+ const char *mod = afb_req_value(request, "mod");
+ const char *dev = afb_req_value(request, "dev");
+
+ if (dev && mod) {
+ afb_req_fail_f (request, "ucmget-labels", "SndCard devid=[%s] name=[%s] UCM mod+dev incompatible", queryValues.devid, cardName);
+ goto OnErrorExit;
+ }
+
+ // device selection is handle as a modifier
+ if (dev) mod=dev;
+
+ const char *labels = afb_req_value(request, "values");
+ if (!labels) {
+ afb_req_fail_f (request, "ucmget-labels", "SndCard devid=[%s] name=[%s] UCM values name missing", queryValues.devid, cardName);
+ goto OnErrorExit;
+ }
+
+ json_object *jLabels = json_tokener_parse(labels);
+ if (!jLabels) {
+ afb_req_fail_f (request, "ucmget-notjson","labels=%s not a valid json entry", labels);
+ goto OnErrorExit;
+ };
+
+ enum json_type jtype= json_object_get_type(jLabels);
+ switch (jtype) {
+ json_object *jTmp;
+
+ case json_type_array:
+ labelCount = json_object_array_length (jLabels);
+ break;
+
+ case json_type_string:
+ jTmp = json_object_new_array ();
+ labelCount = 1;
+ json_object_array_add (jTmp, jLabels);
+ jLabels=jTmp;
+ break;
+
+ default:
+ afb_req_fail_f (request, "ucmget-notarray","labels=%s not valid JSON array", labels);
+ goto OnErrorExit;
+ }
+
+ for (int idx=0; idx < labelCount; idx++) {
+ json_object *jValue, *jLabel;
+ const char *label ;
+
+ jLabel= json_object_array_get_idx (jLabels, idx);
+ label= json_object_get_string (jLabel);
+ jValue = ucmGetValue (&ucmHandles[ucmIdx], verb, mod, label);
+ if (jValue) json_object_object_add (jResponse, label, jValue);
+ else {
+ json_object_array_add (jWarnings, jLabel);
+ }
+ }
+
+ // use info section to notified not found values label
+ if (json_object_array_length (jWarnings) > 0) {
+ json_object *jTmp = json_object_new_object ();
+ json_object_object_add (jTmp, "no-context", jWarnings);
+ warnings= json_object_to_json_string (jTmp);
+ }
+ afb_req_success (request, jResponse, warnings);
+
+ OnErrorExit:
+ return;
+}
+
+PUBLIC void alsaUseCaseSet(struct afb_req request) {
+ int err, ucmIdx;
+ queryValuesT queryValues;
+ json_object *jResponse = json_object_new_object();
+
+ err = alsaCheckQuery (request, &queryValues);
+ if (err) goto OnErrorExit;
+
+ ucmIdx = alsaUseCaseOpen (request, &queryValues, TRUE);
+ if (ucmIdx < 0) goto OnErrorExit;
+
+ snd_use_case_mgr_t *ucmMgr= ucmHandles[ucmIdx].ucm;
+ const char *cardName= ucmHandles[ucmIdx].cardName;
+
+ const char *verb = afb_req_value(request, "verb");
+ const char *mod = afb_req_value(request, "mod");
+ const char *dev = afb_req_value(request, "dev");
+ // Known identifiers: _verb - set current verb = value _enadev - enable given device = value _disdev - disable given device = value _swdev/{old_device} - new_device = value
+
+ if (verb) {
+ err = snd_use_case_set (ucmMgr, "_verb", verb);
+ if (err) {
+ afb_req_fail_f (request, "ucmset-verb", "SndCard devid=[%s] name=[%s] Invalid UCM verb=[%s] err=%s", queryValues.devid, cardName, verb, snd_strerror(err));
+ goto OnErrorExit;
+ }
+ }
+
+ if (dev) {
+ err = snd_use_case_set (ucmMgr, "_enadev", dev);
+ if (err) {
+ afb_req_fail_f (request, "ucmset-dev", "SndCard devid=[%s] name=[%s] Invalid UCMverb=[%s] dev=%s err=%s", queryValues.devid, cardName, verb, dev, snd_strerror(err));
+ goto OnErrorExit;
+ }
+ }
+
+ if (mod) {
+ err = snd_use_case_set (ucmMgr, "_enamod", mod);
+ if (err) {
+ afb_req_fail_f (request, "ucmset-mod", "SndCard devid=[%s] name=[%s] Invalid UCM verb=[%s] mod=[%s] err=%s", queryValues.devid, cardName, verb, mod, snd_strerror(err));
+ goto OnErrorExit;
+ }
+ }
+
+ // label are requested transfert request to get
+ if (afb_req_value(request, "values")) return alsaUseCaseGet(request);
+
+ if (queryValues.quiet <= 3) {
+ json_object *jValue;
+
+ jValue = ucmGetValue (&ucmHandles[ucmIdx], verb, dev, "OutputDspName");
+ if (jValue) json_object_object_add (jResponse, "OutputDspName", jValue);
+
+ jValue = ucmGetValue (&ucmHandles[ucmIdx], verb, dev, "PlaybackPCM");
+ if (jValue) json_object_object_add (jResponse, "PlaybackPCM", jValue);
+
+ jValue = ucmGetValue (&ucmHandles[ucmIdx], verb, mod, "CapturePCM");
+ if (jValue) json_object_object_add (jResponse, "CapturePCM", jValue);
+ }
+ afb_req_success (request, jResponse, NULL);
+
+ OnErrorExit:
+ return;
+}
+
+
+
+PUBLIC void alsaUseCaseReset (struct afb_req request) {
+ int err, ucmIdx;
+ queryValuesT queryValues;
+
+ err = alsaCheckQuery (request, &queryValues);
+ if (err) goto OnErrorExit;
+
+ ucmIdx = alsaUseCaseOpen (request, &queryValues, FALSE);
+ if (ucmIdx < 0) goto OnErrorExit;
+
+ err= snd_use_case_mgr_reset (ucmHandles[ucmIdx].ucm);
+ if (err) {
+ afb_req_fail_f (request, "ucmreset-fail","devid=%s Card Name=%s", queryValues.devid, ucmHandles[ucmIdx].cardName);
+ goto OnErrorExit;
+ }
+
+ afb_req_success (request, NULL, NULL);
+
+ OnErrorExit:
+ return;
+}
+
+PUBLIC void alsaUseCaseClose (struct afb_req request) {
+ int err, ucmIdx;
+ queryValuesT queryValues;
+
+ err = alsaCheckQuery (request, &queryValues);
+ if (err) goto OnErrorExit;
+
+ ucmIdx = alsaUseCaseOpen (request, &queryValues, FALSE);
+ if (ucmIdx < 0) goto OnErrorExit;
+
+ err= snd_use_case_mgr_close (ucmHandles[ucmIdx].ucm);
+ if (err) {
+ afb_req_fail_f (request, "ucmreset-close","devid=%s Card Name=%s", queryValues.devid, ucmHandles[ucmIdx].cardName);
+ goto OnErrorExit;
+ }
+
+ // do not forget to release sound card name string
+ free (ucmHandles[ucmIdx].cardName);
+
+ afb_req_success (request, NULL, NULL);
+
+ OnErrorExit:
+ return;
+}
+
+