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Diffstat (limited to 'ALSA-afb/AlsaUseCase.c')
| -rw-r--r-- | ALSA-afb/AlsaUseCase.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/ALSA-afb/AlsaUseCase.c b/ALSA-afb/AlsaUseCase.c new file mode 100644 index 0000000..8e23e3c --- /dev/null +++ b/ALSA-afb/AlsaUseCase.c @@ -0,0 +1,433 @@ +/* + * 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; +} + + |