diff options
Diffstat (limited to 'Alsa-afb/Alsa-SetGet.c')
| -rw-r--r-- | Alsa-afb/Alsa-SetGet.c | 809 |
1 files changed, 809 insertions, 0 deletions
diff --git a/Alsa-afb/Alsa-SetGet.c b/Alsa-afb/Alsa-SetGet.c new file mode 100644 index 0000000..04f2929 --- /dev/null +++ b/Alsa-afb/Alsa-SetGet.c @@ -0,0 +1,809 @@ +/* + * AlsaLibMapping -- 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: + https://github.com/fulup-bzh/AlsaJsonGateway (original code) + http://alsa-lib.sourcearchive.com/documentation/1.0.20/modules.html + http://alsa-lib.sourcearchive.com/documentation/1.0.8/group__Control_gd48d44da8e3bfe150e928267008b8ff5.html + http://alsa.opensrc.org/HowTo_access_a_mixer_control + https://github.com/gch1p/alsa-volume-monitor/blob/master/main.c + https://github.com/DongheonKim/android_hardware_alsa-sound/blob/master/ALSAControl.cpp (ALSA low level API) + https://www.kernel.org/doc/html/v4.11/sound/index.html + + */ + +#define _GNU_SOURCE // needed for vasprintf +#include "Alsa-ApiHat.h" + +PUBLIC void NumidsListParse(ActionSetGetT action, queryValuesT *queryValues, ctlRequestT *ctlRequest) { + int length; + + for (int idx = 0; idx < queryValues->count; idx++) { + json_object *jId, *valuesJ; + ctlRequest[idx].used = 0; + ctlRequest[idx].valuesJ = NULL; + + // when only one NUMID is provided it might not be encapsulated in a JSON array + if (json_type_array == json_object_get_type(queryValues->numidsJ)) ctlRequest[idx].jToken = json_object_array_get_idx(queryValues->numidsJ, idx); + else ctlRequest[idx].jToken = queryValues->numidsJ; + + enum json_type jtype = json_object_get_type(ctlRequest[idx].jToken); + switch (jtype) { + + case json_type_int: + // if NUMID is not an array then it should be an integer numid with no value + ctlRequest[idx].numId = json_object_get_int(ctlRequest[idx].jToken); + + // Special SET simple short numid form [numid, [VAL1...VALX]] + if (action == ACTION_SET && queryValues->count == 2) { + ctlRequest[idx].valuesJ = json_object_array_get_idx(queryValues->numidsJ, 1); + queryValues->count = 1; //In this form count==2 , when only one numid is to set + idx++; + continue; + } else + break; + + case json_type_array: + // NUMID is an array 1st slot should be numid, optionally values may come after + length = json_object_array_length(ctlRequest[idx].jToken); + + // numid must be in 1st slot of numid json array + ctlRequest[idx].numId = json_object_get_int(json_object_array_get_idx(ctlRequest[idx].jToken, 0)); + if (action == ACTION_GET) continue; + + // In Write mode second value should be the value + if (action == ACTION_SET && length == 2) { + ctlRequest[idx].valuesJ = json_object_array_get_idx(ctlRequest[idx].jToken, 1); + continue; + } + + // no numid value + ctlRequest[idx].used = -1; + break; + + case json_type_object: + // numid+values formated as {id:xxx, val:[aa,bb...,nn]} + if (!json_object_object_get_ex(ctlRequest[idx].jToken, "id", &jId) || !json_object_object_get_ex(ctlRequest[idx].jToken, "val", &valuesJ)) { + AFB_NOTICE("Invalid Json=%s missing 'id'|'val'", json_object_get_string(ctlRequest[idx].jToken)); + ctlRequest[idx].used = -1; + } else { + ctlRequest[idx].numId = json_object_get_int(jId); + if (action == ACTION_SET) ctlRequest[idx].valuesJ = valuesJ; + } + break; + + default: + ctlRequest[idx].used = -1; + } + } +} + +STATIC json_object *DB2StringJsonOject(long dB) { + char label [20]; + if (dB < 0) { + snprintf(label, sizeof (label), "-%li.%02lidB", -dB / 100, -dB % 100); + } else { + snprintf(label, sizeof (label), "%li.%02lidB", dB / 100, dB % 100); + } + + // json function takes care of string copy + return (json_object_new_string(label)); +} + + +// Direct port from amixer TLV decode routine. This code is too complex for me. +// I hopefully did not break it when porting it. + +STATIC json_object *decodeTlv(unsigned int *tlv, unsigned int tlv_size, int mode) { + char label[20]; + unsigned int type = tlv[0]; + unsigned int size; + unsigned int idx = 0; + const char *chmap_type = NULL; + json_object * decodeTlvJson = json_object_new_object(); + + if (tlv_size < (unsigned int) (2 * sizeof (unsigned int))) { + printf("TLV size error!\n"); + return NULL; + } + type = tlv[idx++]; + size = tlv[idx++]; + tlv_size -= (unsigned int) (2 * sizeof (unsigned int)); + if (size > tlv_size) { + fprintf(stderr, "TLV size error (%i, %i, %i)!\n", type, size, tlv_size); + return NULL; + } + switch (type) { + + case SND_CTL_TLVT_CONTAINER: + { + json_object * containerJson = json_object_new_array(); + + size += (unsigned int) (sizeof (unsigned int) - 1); + size /= (unsigned int) (sizeof (unsigned int)); + while (idx < size) { + json_object *embedJson; + + if (tlv[idx + 1] > (size - idx) * sizeof (unsigned int)) { + fprintf(stderr, "TLV size error in compound!\n"); + return NULL; + } + embedJson = decodeTlv(tlv + idx, tlv[idx + 1] + 8, mode); + json_object_array_add(containerJson, embedJson); + idx += (unsigned int) (2 + (tlv[idx + 1] + sizeof (unsigned int) - 1) / sizeof (unsigned int)); + } + json_object_object_add(decodeTlvJson, "container", containerJson); + break; + } + + case SND_CTL_TLVT_DB_SCALE: + { + json_object * dbscaleJson = json_object_new_object(); + + if (size != 2 * sizeof (unsigned int)) { + json_object * arrayJson = json_object_new_array(); + while (size > 0) { + if (mode >= QUERY_VERBOSE) { + snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]); + json_object_array_add(arrayJson, json_object_new_string(label)); + } else { + json_object_array_add(arrayJson, json_object_new_int(tlv[idx++])); + } + size -= (unsigned int) sizeof (unsigned int); + } + json_object_object_add(dbscaleJson, "array", arrayJson); + } else { + if (mode >= QUERY_VERBOSE) { + json_object_object_add(dbscaleJson, "min", DB2StringJsonOject((int) tlv[2])); + json_object_object_add(dbscaleJson, "step", DB2StringJsonOject(tlv[3] & 0xffff)); + json_object_object_add(dbscaleJson, "mute", DB2StringJsonOject((tlv[3] >> 16) & 1)); + } else { + json_object_object_add(dbscaleJson, "min", json_object_new_int((int) tlv[2])); + json_object_object_add(dbscaleJson, "step", json_object_new_int(tlv[3] & 0xffff)); + json_object_object_add(dbscaleJson, "mute", json_object_new_int((tlv[3] >> 16) & 1)); + } + } + json_object_object_add(decodeTlvJson, "dbscale", dbscaleJson); + break; + } + +#ifdef SND_CTL_TLVT_DB_LINEAR + case SND_CTL_TLVT_DB_LINEAR: + { + json_object * dbLinearJson = json_object_new_object(); + + if (size != 2 * sizeof (unsigned int)) { + json_object * arrayJson = json_object_new_array(); + while (size > 0) { + if (mode >= QUERY_VERBOSE) { + snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]); + json_object_array_add(arrayJson, json_object_new_string(label)); + } else { + json_object_array_add(arrayJson, json_object_new_int(tlv[idx++])); + } + size -= (unsigned int) sizeof (unsigned int); + } + json_object_object_add(dbLinearJson, "offset", arrayJson); + } else { + if (mode >= QUERY_VERBOSE) { + json_object_object_add(dbLinearJson, "min", DB2StringJsonOject((int) tlv[2])); + json_object_object_add(dbLinearJson, "max", DB2StringJsonOject((int) tlv[3])); + } else { + json_object_object_add(dbLinearJson, "min", json_object_new_int((int) tlv[2])); + json_object_object_add(dbLinearJson, "max", json_object_new_int((int) tlv[3])); + } + } + json_object_object_add(decodeTlvJson, "dblinear", dbLinearJson); + break; + } +#endif + +#ifdef SND_CTL_TLVT_DB_RANGE + case SND_CTL_TLVT_DB_RANGE: + { + json_object *dbRangeJson = json_object_new_object(); + + if ((size % (6 * sizeof (unsigned int))) != 0) { + json_object *arrayJson = json_object_new_array(); + while (size > 0) { + if (mode >= QUERY_VERBOSE) { + snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]); + json_object_array_add(arrayJson, json_object_new_string(label)); + } else { + json_object_array_add(arrayJson, json_object_new_int(tlv[idx++])); + } + size -= (unsigned int) sizeof (unsigned int); + } + json_object_object_add(dbRangeJson, "dbrange", arrayJson); + break; + } + while (size > 0) { + json_object * embedJson = json_object_new_object(); + json_object_object_add(embedJson, "rangemin", json_object_new_int(tlv[idx++])); + json_object_object_add(embedJson, "rangemax", json_object_new_int(tlv[idx++])); + embedJson = decodeTlv(tlv + idx, 4 * sizeof (unsigned int), mode); + json_object_object_add(embedJson, "tlv", embedJson); + idx += 4; + size -= (unsigned int) (6 * sizeof (unsigned int)); + json_object_array_add(dbRangeJson, embedJson); + } + json_object_object_add(decodeTlvJson, "dbrange", dbRangeJson); + break; + } +#endif +#ifdef SND_CTL_TLVT_DB_MINMAX + case SND_CTL_TLVT_DB_MINMAX: + case SND_CTL_TLVT_DB_MINMAX_MUTE: + { + json_object * dbMinMaxJson = json_object_new_object(); + + if (size != 2 * sizeof (unsigned int)) { + json_object * arrayJson = json_object_new_array(); + while (size > 0) { + if (mode >= QUERY_VERBOSE) { + snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]); + json_object_array_add(arrayJson, json_object_new_string(label)); + } else { + json_object_array_add(arrayJson, json_object_new_int(tlv[idx++])); + } + size -= (unsigned int) sizeof (unsigned int); + } + json_object_object_add(dbMinMaxJson, "array", arrayJson); + + } else { + if (mode >= QUERY_VERBOSE) { + json_object_object_add(dbMinMaxJson, "min", DB2StringJsonOject((int) tlv[2])); + json_object_object_add(dbMinMaxJson, "max", DB2StringJsonOject((int) tlv[3])); + } else { + json_object_object_add(dbMinMaxJson, "min", json_object_new_int((int) tlv[2])); + json_object_object_add(dbMinMaxJson, "max", json_object_new_int((int) tlv[3])); + } + } + + if (type == SND_CTL_TLVT_DB_MINMAX_MUTE) { + json_object_object_add(decodeTlvJson, "dbminmaxmute", dbMinMaxJson); + } else { + json_object_object_add(decodeTlvJson, "dbminmax", dbMinMaxJson); + } + break; + } +#endif +#ifdef SND_CTL_TLVT_CHMAP_FIXED + case SND_CTL_TLVT_CHMAP_FIXED: + chmap_type = "fixed"; + /* Fall through */ + case SND_CTL_TLVT_CHMAP_VAR: + if (!chmap_type) + chmap_type = "variable"; + /* Fall through */ + case SND_CTL_TLVT_CHMAP_PAIRED: + if (!chmap_type) + chmap_type = "paired"; + + json_object * chmapJson = json_object_new_object(); + json_object * arrayJson = json_object_new_array(); + + while (size > 0) { + snprintf(label, sizeof (label), "%s", snd_pcm_chmap_name(tlv[idx++])); + size -= (unsigned int) sizeof (unsigned int); + json_object_array_add(arrayJson, json_object_new_string(label)); + } + json_object_object_add(chmapJson, chmap_type, arrayJson); + json_object_object_add(decodeTlvJson, "chmap", chmapJson); + break; +#endif + default: + { + printf("unk-%i-", type); + json_object * arrayJson = json_object_new_array(); + + while (size > 0) { + snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]); + size -= (unsigned int) sizeof (unsigned int); + json_object_array_add(arrayJson, json_object_new_string(label)); + } + break; + json_object_object_add(decodeTlvJson, "unknown", arrayJson); + } + } + + return (decodeTlvJson); +} + + +// retreive info for one given card + +STATIC json_object* alsaCardProbe(const char *rqtSndId) { + const char *info, *name; + const char *devid, *driver; + json_object *ctlDev; + snd_ctl_t *handle; + snd_ctl_card_info_t *cardinfo; + int err; + + if ((err = snd_ctl_open(&handle, rqtSndId, 0)) < 0) { + AFB_INFO("alsaCardProbe '%s' Not Found", rqtSndId); + return NULL; + } + + snd_ctl_card_info_alloca(&cardinfo); + if ((err = snd_ctl_card_info(handle, cardinfo)) < 0) { + snd_ctl_close(handle); + AFB_WARNING("SndCard '%s' info error: %s", rqtSndId, snd_strerror(err)); + return NULL; + } + + // start a new json object to store card info + ctlDev = json_object_new_object(); + + devid = snd_ctl_card_info_get_id(cardinfo); + json_object_object_add(ctlDev, "devid", json_object_new_string(devid)); + name = snd_ctl_card_info_get_name(cardinfo); + json_object_object_add(ctlDev, "name", json_object_new_string(name)); + + if (AFB_GET_VERBOSITY > 1) { + json_object_object_add(ctlDev, "devid", json_object_new_string(rqtSndId)); + driver = snd_ctl_card_info_get_driver(cardinfo); + json_object_object_add(ctlDev, "driver", json_object_new_string(driver)); + info = strdup(snd_ctl_card_info_get_longname(cardinfo)); + json_object_object_add(ctlDev, "info", json_object_new_string(info)); + AFB_INFO("AJG: Soundcard Devid=%-5s devid=%-7s Name=%s\n", rqtSndId, devid, info); + } + + // free card handle and return info + snd_ctl_close(handle); + return (ctlDev); +} + +// Loop on every potential Sound card and register active one + +PUBLIC void alsaGetInfo(afb_req request) { + int card; + json_object *ctlDev, *ctlDevs; + char devid[32]; + + const char *rqtSndId = afb_req_value(request, "devid"); + + // if no specific card requested loop on all + + if (rqtSndId != NULL) { + // only one card was requested let's probe it + ctlDev = alsaCardProbe(rqtSndId); + if (ctlDev != NULL) afb_req_success(request, ctlDev, NULL); + else afb_req_fail_f(request, "sndscard-notfound", "SndCard '%s' Not Found", rqtSndId); + + } else { + // return an array of ctlDev + ctlDevs = json_object_new_array(); + + // loop on potential card number + for (card = 0; card < MAX_SND_CARD; card++) { + + // build card devid and probe it + snprintf(devid, sizeof (devid), "hw:%i", card); + ctlDev = alsaCardProbe(devid); + + // Alsa has hole within card list [ignore them] + if (ctlDev != NULL) { + // add current ctlDev to ctlDevs object + json_object_array_add(ctlDevs, ctlDev); + } + } + afb_req_success(request, ctlDevs, NULL); + } +} + +// pack Alsa element's ACL into a JSON object + +STATIC json_object *getControlAcl(snd_ctl_elem_info_t *info) { + + json_object * jsonAclCtl = json_object_new_object(); + + json_object_object_add(jsonAclCtl, "read", json_object_new_boolean(snd_ctl_elem_info_is_readable(info))); + json_object_object_add(jsonAclCtl, "write", json_object_new_boolean(snd_ctl_elem_info_is_writable(info))); + json_object_object_add(jsonAclCtl, "inact", json_object_new_boolean(snd_ctl_elem_info_is_inactive(info))); + json_object_object_add(jsonAclCtl, "volat", json_object_new_boolean(snd_ctl_elem_info_is_volatile(info))); + json_object_object_add(jsonAclCtl, "lock", json_object_new_boolean(snd_ctl_elem_info_is_locked(info))); + + // if TLV is readable we insert its ACL + if (!snd_ctl_elem_info_is_tlv_readable(info)) { + json_object * jsonTlv = json_object_new_object(); + + json_object_object_add(jsonTlv, "read", json_object_new_boolean(snd_ctl_elem_info_is_tlv_readable(info))); + json_object_object_add(jsonTlv, "write", json_object_new_boolean(snd_ctl_elem_info_is_tlv_writable(info))); + json_object_object_add(jsonTlv, "command", json_object_new_boolean(snd_ctl_elem_info_is_tlv_commandable(info))); + + json_object_object_add(jsonAclCtl, "tlv", jsonTlv); + } + return (jsonAclCtl); +} + +// process ALSA control and store resulting value into ctlRequest + +PUBLIC int alsaSetSingleCtl(snd_ctl_t *ctlDev, snd_ctl_elem_id_t *elemId, ctlRequestT *ctlRequest) { + snd_ctl_elem_value_t *elemData; + snd_ctl_elem_info_t *elemInfo; + int count, length, err, valueIsArray = 0; + + // let's make sure we are processing the right control + if (ctlRequest->numId != snd_ctl_elem_id_get_numid(elemId)) goto OnErrorExit; + + // set info event ID and get value + snd_ctl_elem_info_alloca(&elemInfo); + snd_ctl_elem_info_set_id(elemInfo, elemId); // map ctlInfo to ctlId elemInfo is updated !!! + if (snd_ctl_elem_info(ctlDev, elemInfo) < 0) { + AFB_NOTICE("Fail to load ALSA NUMID=%d Values='%s'", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ)); + goto OnErrorExit; + } + + if (!snd_ctl_elem_info_is_writable(elemInfo)) { + AFB_NOTICE("Not Writable ALSA NUMID=%d Values='%s'", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ)); + goto OnErrorExit; + } + + count = snd_ctl_elem_info_get_count(elemInfo); + if (count == 0) goto OnErrorExit; + + enum json_type jtype = json_object_get_type(ctlRequest->valuesJ); + switch (jtype) { + case json_type_array: + length = json_object_array_length(ctlRequest->valuesJ); + valueIsArray = 1; + break; + case json_type_int: + length = 1; + valueIsArray = 0; + break; + default: + length = 0; + break; + } + + + if (length == 0) { + AFB_NOTICE("Invalid values NUMID='%d' Values='%s' count='%d' wanted='%d'", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ), length, count); + goto OnErrorExit; + } + + snd_ctl_elem_value_alloca(&elemData); + snd_ctl_elem_value_set_id(elemData, elemId); // map ctlInfo to ctlId elemInfo is updated !!! + if (snd_ctl_elem_read(ctlDev, elemData) < 0) goto OnErrorExit; + + // Loop on every control value and push to sndcard + for (int index = 0; index < count; index++) { + json_object *element; + int value; + + // when not enough value duplicate last provided one + if (!valueIsArray) element = ctlRequest->valuesJ; + else { + if (index < length) element = json_object_array_get_idx(ctlRequest->valuesJ, index); + else element = json_object_array_get_idx(ctlRequest->valuesJ, length - 1); + } + + value = json_object_get_int(element); + snd_ctl_elem_value_set_integer(elemData, index, value); + } + + err = snd_ctl_elem_write(ctlDev, elemData); + if (err < 0) { + AFB_NOTICE("Fail to write ALSA NUMID=%d Values='%s' Error=%s", ctlRequest->numId, json_object_get_string(ctlRequest->valuesJ), snd_strerror(err)); + goto OnErrorExit; + } + + ctlRequest->used = 1; + return 0; + +OnErrorExit: + ctlRequest->used = -1; + return -1; +} + +// process ALSA control and store then into ctlRequest + +PUBLIC int alsaGetSingleCtl(snd_ctl_t *ctlDev, snd_ctl_elem_id_t *elemId, ctlRequestT *ctlRequest, halQueryMode queryMode) { + snd_ctl_elem_type_t elemType; + snd_ctl_elem_value_t *elemData; + snd_ctl_elem_info_t *elemInfo; + int count, idx, err; + + + // set info event ID and get value + + snd_ctl_elem_info_alloca(&elemInfo); + snd_ctl_elem_info_set_id(elemInfo, elemId); + if (snd_ctl_elem_info(ctlDev, elemInfo) < 0) goto OnErrorExit; + count = snd_ctl_elem_info_get_count(elemInfo); + if (count == 0) goto OnErrorExit; + + if (!snd_ctl_elem_info_is_readable(elemInfo)) goto OnErrorExit; + elemType = snd_ctl_elem_info_get_type(elemInfo); + + snd_ctl_elem_value_alloca(&elemData); + snd_ctl_elem_value_set_id(elemData, elemId); + if (snd_ctl_elem_read(ctlDev, elemData) < 0) goto OnErrorExit; + + int numid = snd_ctl_elem_info_get_numid(elemInfo); + + ctlRequest->valuesJ = json_object_new_object(); + json_object_object_add(ctlRequest->valuesJ, "id", json_object_new_int(numid)); + if (queryMode >= 1) json_object_object_add(ctlRequest->valuesJ, "name", json_object_new_string(snd_ctl_elem_id_get_name(elemId))); + if (queryMode >= 2) json_object_object_add(ctlRequest->valuesJ, "iface", json_object_new_string(snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(elemId)))); + if (queryMode >= 3) json_object_object_add(ctlRequest->valuesJ, "actif", json_object_new_boolean(!snd_ctl_elem_info_is_inactive(elemInfo))); + + json_object *jsonValuesCtl = json_object_new_array(); + for (idx = 0; idx < count; idx++) { // start from one in amixer.c !!! + switch (elemType) { + case SND_CTL_ELEM_TYPE_BOOLEAN: + { + json_object_array_add(jsonValuesCtl, json_object_new_boolean(snd_ctl_elem_value_get_boolean(elemData, idx))); + break; + } + case SND_CTL_ELEM_TYPE_INTEGER: + json_object_array_add(jsonValuesCtl, json_object_new_int((int) snd_ctl_elem_value_get_integer(elemData, idx))); + break; + case SND_CTL_ELEM_TYPE_INTEGER64: + json_object_array_add(jsonValuesCtl, json_object_new_int64(snd_ctl_elem_value_get_integer64(elemData, idx))); + break; + case SND_CTL_ELEM_TYPE_ENUMERATED: + json_object_array_add(jsonValuesCtl, json_object_new_int(snd_ctl_elem_value_get_enumerated(elemData, idx))); + break; + case SND_CTL_ELEM_TYPE_BYTES: + json_object_array_add(jsonValuesCtl, json_object_new_int((int) snd_ctl_elem_value_get_byte(elemData, idx))); + break; + case SND_CTL_ELEM_TYPE_IEC958: + { + json_object *jsonIec958Ctl = json_object_new_object(); + snd_aes_iec958_t iec958; + snd_ctl_elem_value_get_iec958(elemData, &iec958); + + json_object_object_add(jsonIec958Ctl, "AES0", json_object_new_int(iec958.status[0])); + json_object_object_add(jsonIec958Ctl, "AES1", json_object_new_int(iec958.status[1])); + json_object_object_add(jsonIec958Ctl, "AES2", json_object_new_int(iec958.status[2])); + json_object_object_add(jsonIec958Ctl, "AES3", json_object_new_int(iec958.status[3])); + json_object_array_add(jsonValuesCtl, jsonIec958Ctl); + break; + } + default: + json_object_array_add(jsonValuesCtl, json_object_new_string("?unknown?")); + break; + } + } + json_object_object_add(ctlRequest->valuesJ, "val", jsonValuesCtl); + + if (queryMode >= 1) { // in simple mode do not print usable values + json_object *jsonClassCtl = json_object_new_object(); + json_object_object_add(jsonClassCtl, "type", json_object_new_int(elemType)); + json_object_object_add(jsonClassCtl, "count", json_object_new_int(count)); + + switch (elemType) { + case SND_CTL_ELEM_TYPE_INTEGER: + json_object_object_add(jsonClassCtl, "min", json_object_new_int((int) snd_ctl_elem_info_get_min(elemInfo))); + json_object_object_add(jsonClassCtl, "max", json_object_new_int((int) snd_ctl_elem_info_get_max(elemInfo))); + json_object_object_add(jsonClassCtl, "step", json_object_new_int((int) snd_ctl_elem_info_get_step(elemInfo))); + break; + case SND_CTL_ELEM_TYPE_INTEGER64: + json_object_object_add(jsonClassCtl, "min", json_object_new_int64(snd_ctl_elem_info_get_min64(elemInfo))); + json_object_object_add(jsonClassCtl, "max", json_object_new_int64(snd_ctl_elem_info_get_max64(elemInfo))); + json_object_object_add(jsonClassCtl, "step", json_object_new_int64(snd_ctl_elem_info_get_step64(elemInfo))); + break; + case SND_CTL_ELEM_TYPE_ENUMERATED: + { + unsigned int item, items = snd_ctl_elem_info_get_items(elemInfo); + json_object *jsonEnum = json_object_new_array(); + + for (item = 0; item < items; item++) { + snd_ctl_elem_info_set_item(elemInfo, item); + if ((err = snd_ctl_elem_info(ctlDev, elemInfo)) >= 0) { + json_object_array_add(jsonEnum, json_object_new_string(snd_ctl_elem_info_get_item_name(elemInfo))); + } + } + json_object_object_add(jsonClassCtl, "enums", jsonEnum); + break; + } + default: break; // ignore any unknown type + } + + // add collected class info with associated ACLs + json_object_object_add(ctlRequest->valuesJ, "ctl", jsonClassCtl); + + if (queryMode >= QUERY_FULL) json_object_object_add(ctlRequest->valuesJ, "acl", getControlAcl(elemInfo)); + + // check for tlv [direct port from amixer.c] + if (snd_ctl_elem_info_is_tlv_readable(elemInfo)) { + unsigned int *tlv = alloca(TLV_BYTE_SIZE); + if ((err = snd_ctl_elem_tlv_read(ctlDev, elemId, tlv, 4096)) < 0) { + AFB_NOTICE("Control numid=%d err=%s element TLV read error\n", numid, snd_strerror(err)); + goto OnErrorExit; + } else { + json_object_object_add(ctlRequest->valuesJ, "tlv", decodeTlv(tlv, TLV_BYTE_SIZE, queryMode)); + } + } + } + + ctlRequest->used = 1; + return 0; + +OnErrorExit: + ctlRequest->used = -1; + return -1; +} + +// assign multiple control to the same value + +STATIC void alsaSetGetCtls(ActionSetGetT action, afb_req request) { + ctlRequestT *ctlRequest; + const char *warmsg = NULL; + int err = 0, status = 0, done; + unsigned int ctlCount; + snd_ctl_t *ctlDev; + snd_ctl_elem_list_t *ctlList; + queryValuesT queryValues; + json_object *queryJ, *numidsJ, *sndctls; + + queryJ = alsaCheckQuery(request, &queryValues); + if (!queryJ) goto OnErrorExit; + + // Prase Numids + optional values + done = json_object_object_get_ex(queryJ, "ctl", &numidsJ); + if (!done) queryValues.count = 0; + else { + enum json_type jtype = json_object_get_type(numidsJ); + switch (jtype) { + case json_type_array: + queryValues.numidsJ = numidsJ; + queryValues.count = json_object_array_length(numidsJ); + break; + + case json_type_int: + case json_type_object: + queryValues.count = 1; + queryValues.numidsJ = numidsJ; + break; + + default: + afb_req_fail_f(request, "numid-notarray", "NumId=%s NumId not valid JSON array", json_object_get_string(numidsJ)); + goto OnErrorExit; + } + } + + if ((err = snd_ctl_open(&ctlDev, queryValues.devid, 0)) < 0) { + afb_req_fail_f(request, "sndcrl-notfound", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err)); + goto OnErrorExit; + } + + snd_ctl_elem_list_alloca(&ctlList); + if ((err = snd_ctl_elem_list(ctlDev, ctlList)) < 0) { + afb_req_fail_f(request, "listInit-failed", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err)); + goto OnErrorExit; + } + + if ((err = snd_ctl_elem_list_alloc_space(ctlList, snd_ctl_elem_list_get_count(ctlList))) < 0) { + afb_req_fail_f(request, "listAlloc-failed", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err)); + goto OnErrorExit; + } + + if ((err = snd_ctl_elem_list(ctlDev, ctlList)) < 0) { + afb_req_fail_f(request, "listOpen-failed", "devid='%s' load fail error=%s\n", queryValues.devid, snd_strerror(err)); + goto OnErrorExit; + } + + // Parse numids string (empty == all) + ctlCount = snd_ctl_elem_list_get_used(ctlList); + if (queryValues.count == 0) { + ctlRequest = alloca(sizeof (ctlRequestT)*(ctlCount)); + } else { + ctlRequest = alloca(sizeof (ctlRequestT)*(queryValues.count)); + NumidsListParse(action, &queryValues, ctlRequest); + } + + // if more than one crl requested prepare an array for response + if (queryValues.count != 1 && action == ACTION_GET) sndctls = json_object_new_array(); + else sndctls = NULL; + + // Loop on all ctlDev controls + for (int ctlIndex = 0; ctlIndex < ctlCount; ctlIndex++) { + unsigned int selected = 0; + int jdx; + + if (queryValues.count == 0 && action == ACTION_GET) { + selected = 1; // check is this numid is selected within query + jdx = ctlIndex; // map all existing ctl as requested + } else { + int numid = snd_ctl_elem_list_get_numid(ctlList, ctlIndex); + if (numid < 0) { + AFB_NOTICE("snd_ctl_elem_list_get_numid index=%d fail", ctlIndex); + continue; + } + // check if current control was requested in query numids list + for (jdx = 0; jdx < queryValues.count; jdx++) { + if (numid == ctlRequest[jdx].numId) { + selected = 1; + break; + } + } + } + + // control is selected open ctlid and get value + if (selected) { + snd_ctl_elem_id_t *elemId; + snd_ctl_elem_id_alloca(&elemId); + + snd_ctl_elem_list_get_id(ctlList, ctlIndex, elemId); + switch (action) { + case ACTION_GET: + err = alsaGetSingleCtl(ctlDev, elemId, &ctlRequest[jdx], queryValues.mode); + break; + + case ACTION_SET: + err = alsaSetSingleCtl(ctlDev, elemId, &ctlRequest[jdx]); + break; + + default: + err = 1; + } + if (err) status++; + else { + // Do not embed response in an array when only one ctl was requested + if (action == ACTION_GET) { + if (queryValues.count > 1) json_object_array_add(sndctls, ctlRequest[jdx].valuesJ); + else sndctls = ctlRequest[jdx].valuesJ; + } + } + } + } + + // if we had error let's add them into response message info + json_object *warningsJ = json_object_new_array(); + for (int jdx = 0; jdx < queryValues.count; jdx++) { + if (ctlRequest[jdx].used <= 0) { + json_object *failctl = json_object_new_object(); + if (ctlRequest[jdx].numId == -1) json_object_object_add(failctl, "warning", json_object_new_string("Numid Invalid")); + else { + if (ctlRequest[jdx].used == 0) json_object_object_add(failctl, "warning", json_object_new_string("Numid Does Not Exist")); + if (ctlRequest[jdx].used == -1) json_object_object_add(failctl, "warning", json_object_new_string("Value Refused")); + } + + json_object_object_add(failctl, "ctl", ctlRequest[jdx].jToken); + + json_object_array_add(warningsJ, failctl); + } + /* WARNING!!!! Check with Jose why following put free valuesJ + if (ctlRequest[jdx].jToken) json_object_put(ctlRequest[jdx].jToken); + if (ctlRequest[jdx].valuesJ) json_object_put(ctlRequest[jdx].valuesJ); + */ + } + + if (json_object_array_length(warningsJ) > 0) warmsg = json_object_get_string(warningsJ); + else json_object_put(warningsJ); + + // send response+warning if any + afb_req_success(request, sndctls, warmsg); + snd_ctl_elem_list_clear(ctlList); + +OnErrorExit: + return; +} + +PUBLIC void alsaGetCtls(afb_req request) { + alsaSetGetCtls(ACTION_GET, request); +} + +PUBLIC void alsaSetCtls(afb_req request) { + alsaSetGetCtls(ACTION_SET, request); +} + + |