/* * 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 #include #include #include "Alsa-ApiHat.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; }