aboutsummaryrefslogtreecommitdiffstats
path: root/Alsa-afb/Alsa-AddCtl.c
diff options
context:
space:
mode:
Diffstat (limited to 'Alsa-afb/Alsa-AddCtl.c')
-rw-r--r--Alsa-afb/Alsa-AddCtl.c399
1 files changed, 0 insertions, 399 deletions
diff --git a/Alsa-afb/Alsa-AddCtl.c b/Alsa-afb/Alsa-AddCtl.c
deleted file mode 100644
index aaa9347..0000000
--- a/Alsa-afb/Alsa-AddCtl.c
+++ /dev/null
@@ -1,399 +0,0 @@
-/*
- * 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:
- * https://kernel.readthedocs.io/en/sphinx-samples/writing-an-alsa-driver.html#control-names
- * https://01.org/linuxgraphics/gfx-docs/drm/sound/designs/control-names.html
-
- */
-#define _GNU_SOURCE // needed for vasprintf
-
-#include <alsa/asoundlib.h>
-#include <alsa/sound/tlv.h>
-#include <systemd/sd-event.h>
-#include <sys/ioctl.h>
-
-#include "Alsa-ApiHat.h"
-
-// Performs like a toggle switch for attenuation, because they're bool (ref:user-ctl-element-set.c)
-
-#ifndef SNDRV_CTL_TLVD_DECLARE_DB_MINMAX
-// taken from alsa-lib-1.1.3:include/sound/tlv.h
-
-#define SNDRV_CTL_TLVD_LENGTH(...) \
- ((unsigned int)sizeof((const unsigned int[]) { __VA_ARGS__ }))
-
-#define SNDRV_CTL_TLVD_ITEM(type, ...) \
- (type), SNDRV_CTL_TLVD_LENGTH(__VA_ARGS__), __VA_ARGS__
-
-#define SNDRV_CTL_TLVT_DB_MINMAX 4
-
-#define SNDRV_CTL_TLVD_DB_MINMAX_ITEM(min_dB, max_dB) \
- SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_MINMAX, (min_dB), (max_dB))
-
-#define SNDRV_CTL_TLVD_DECLARE_DB_MINMAX(name, min_dB, max_dB) \
- unsigned int name[] = { \
- SNDRV_CTL_TLVD_DB_MINMAX_ITEM(min_dB, max_dB) \
- }
-
-#define SNDRV_CTL_TLVD_DB_SCALE_MASK 0xffff
-#define SNDRV_CTL_TLVD_DB_SCALE_MUTE 0x10000
-
-#endif
-static const unsigned int *allocate_bool_fake_tlv(void) {
- static const SNDRV_CTL_TLVD_DECLARE_DB_MINMAX(range, -10000, 0);
- unsigned int *tlv = malloc(sizeof (range));
- if (tlv == NULL) return NULL;
- memcpy(tlv, range, sizeof (range));
- return tlv;
-}
-
-static const unsigned int *allocate_int_dbscale_tlv(int min, int step, int mute) {
- // SNDRV_CTL_TLVD_DECLARE_DB_SCALE(range, min, step, mute);
- size_t tlvSize = sizeof (4 * sizeof (unsigned int));
- unsigned int *tlv = malloc(tlvSize);
- tlv[0] = SNDRV_CTL_TLVT_DB_LINEAR;
- tlv[1] = (int) tlvSize;
- tlv[2] = min * 100;
- tlv[3] = ((step * 100) & SNDRV_CTL_TLVD_DB_SCALE_MASK) | ((mute * 100) ? SNDRV_CTL_TLVD_DB_SCALE_MUTE : 0);
- return tlv;
-}
-
-static const unsigned int *allocate_int_linear_tlv(int max, int min) {
- // SNDRV_CTL_TLVD_DECLARE_DB_LINEAR (range, min, max);
- size_t tlvSize = sizeof (4 * sizeof (unsigned int));
- unsigned int *tlv = malloc(tlvSize);
- tlv[0] = SNDRV_CTL_TLVT_DB_LINEAR;
- tlv[1] = (int) tlvSize;
- tlv[2] = -min * 100;
- tlv[3] = max * 100;
- return tlv;
-}
-
-STATIC json_object * addOneSndCtl(afb_req request, snd_ctl_t *ctlDev, json_object *ctlJ, halQueryMode queryMode) {
- int err, done, ctlNumid, ctlValue=0, shouldCreate;
- json_object *tmpJ;
- const char *ctlName;
- ctlRequestT ctlRequest;
- int ctlMax=100, ctlMin=0, ctlStep, ctlCount, ctlSubDev=0, ctlSndDev=0;
- snd_ctl_elem_type_t ctlType=SND_CTL_ELEM_TYPE_NONE;
- snd_ctl_elem_info_t *elemInfo;
- snd_ctl_elem_id_t *elemId;
- snd_ctl_elem_value_t *elemValue;
- const unsigned int *elemTlv = NULL;
-
- // parse json ctl object
- json_object_object_get_ex(ctlJ, "name", &tmpJ);
- ctlName = json_object_get_string(tmpJ);
-
- json_object_object_get_ex(ctlJ, "ctl", &tmpJ);
- ctlNumid = json_object_get_int(tmpJ);
-
- if (!ctlNumid && !ctlName) {
- afb_req_fail_f(request, "ctl-invalid", "crl=%s name or numid missing", json_object_get_string(ctlJ));
- goto OnErrorExit;
- }
-
-
- // We are facing a software ctl
- if (ctlNumid == CTL_AUTO) {
- done = json_object_object_get_ex(ctlJ, "type", &tmpJ);
- if (done) ctlType = json_object_get_int(tmpJ);
- else ctlType = SND_CTL_ELEM_TYPE_INTEGER;
-
- json_object_object_get_ex(ctlJ, "val", &tmpJ);
- ctlValue = json_object_get_int(tmpJ);
-
- // default for json_object_get_int is zero
- json_object_object_get_ex(ctlJ, "min", &tmpJ);
- ctlMin = json_object_get_int(tmpJ);
-
- done = json_object_object_get_ex(ctlJ, "max", &tmpJ);
- if (done) ctlMax = json_object_get_int(tmpJ);
- else {
- if (ctlType == SND_CTL_ELEM_TYPE_BOOLEAN) ctlMax = 1;
- else ctlMax = 100;
- }
-
- done = json_object_object_get_ex(ctlJ, "step", &tmpJ);
- if (!done) ctlStep = 1;
- else ctlStep = json_object_get_int(tmpJ);
-
- done = json_object_object_get_ex(ctlJ, "count", &tmpJ);
- if (!done) ctlCount = 1;
- else ctlCount = json_object_get_int(tmpJ);
-
- json_object_object_get_ex(ctlJ, "snddev", &tmpJ);
- ctlSndDev = json_object_get_int(tmpJ);
-
- json_object_object_get_ex(ctlJ, "subdev", &tmpJ);
- ctlSubDev = json_object_get_int(tmpJ);
- }
-
- // Assert that this ctls is not used
- snd_ctl_elem_info_alloca(&elemInfo);
- if (ctlName) snd_ctl_elem_info_set_name(elemInfo, ctlName);
- if (ctlNumid > 0)snd_ctl_elem_info_set_numid(elemInfo, ctlNumid);
- snd_ctl_elem_info_set_interface(elemInfo, SND_CTL_ELEM_IFACE_MIXER);
-
- // If control exist try to reuse it
- err = snd_ctl_elem_info(ctlDev, elemInfo);
- if (err) {
- shouldCreate = 1;
- } else {
- int count, min, max, sndDev, subDev;
- snd_ctl_elem_type_t type;
-
- // ctl exit let's get associated elemID
- snd_ctl_elem_id_alloca(&elemId);
- snd_ctl_elem_info_get_id(elemInfo, elemId);
-
- // If this is a hardware ctl only update value
- if (ctlNumid != CTL_AUTO) {
- json_object_object_get_ex(ctlJ, "val", &tmpJ);
- ctlValue = json_object_get_int(tmpJ);
- goto UpdateDefaultVal;
- }
-
- count = snd_ctl_elem_info_get_count(elemInfo);
- min = (int) snd_ctl_elem_info_get_min(elemInfo);
- max = (int) snd_ctl_elem_info_get_max(elemInfo);
- type = snd_ctl_elem_info_get_type(elemInfo);
- sndDev = (int) snd_ctl_elem_info_get_device(elemInfo);
- subDev = (int) snd_ctl_elem_info_get_subdevice(elemInfo);
-
- if (count == ctlCount && min == ctlMin && max == ctlMax && type == ctlType && sndDev == ctlSndDev && subDev == ctlSubDev) {
- // Adjust value to best fit request
- shouldCreate = 0;
- } else {
- err = snd_ctl_elem_remove(ctlDev, elemId);
- shouldCreate = 1;
- if (err < 0) {
- AFB_ERROR("addOneSndCtl: ctlName=%s numid=%d fail to reset", snd_ctl_elem_info_get_name(elemInfo), snd_ctl_elem_info_get_numid(elemInfo));
- goto DoNotUpdate;
- };
-
- // Control was deleted need to refresh elemInfo
- snd_ctl_elem_info_alloca(&elemInfo);
- if (ctlName) snd_ctl_elem_info_set_name(elemInfo, ctlName);
- snd_ctl_elem_info_set_interface(elemInfo, SND_CTL_ELEM_IFACE_MIXER);
- snd_ctl_elem_info(ctlDev, elemInfo);
- }
- }
-
- // Add requested ID into elemInfo
- snd_ctl_elem_info_set_device(elemInfo, ctlSndDev);
- snd_ctl_elem_info_set_subdevice(elemInfo, ctlSubDev);
-
- switch (ctlType) {
- case SND_CTL_ELEM_TYPE_BOOLEAN:
- if (shouldCreate) {
- err = snd_ctl_add_boolean_elem_set(ctlDev, elemInfo, 1, ctlCount);
- if (err) {
- AFB_ERROR("AddOntSndCtl Boolean: devid='%s' name='%s' count=%d", snd_ctl_name(ctlDev), ctlName, ctlCount);
- afb_req_fail_f(request, "ctl-invalid-bool", "devid='%s' name='%s' count=%d", snd_ctl_name(ctlDev), ctlName, ctlCount);
- goto OnErrorExit;
- }
- }
-
- // Create a dummy TLV
- elemTlv = allocate_bool_fake_tlv();
-
- break;
-
- case SND_CTL_ELEM_TYPE_INTEGER:
- if (shouldCreate) {
- err = snd_ctl_add_integer_elem_set(ctlDev, elemInfo, 1, ctlCount, ctlMin, ctlMax, ctlStep);
- if (err) {
- AFB_ERROR("AddOntSndCtl Integer: devid='%s' name='%s' count=%d min=%d max=%d step=%d", snd_ctl_name(ctlDev), ctlName, ctlCount, ctlMin, ctlMax, ctlStep);
- afb_req_fail_f(request, "ctl-invalid-bool", "devid='%s' name='%s' count=%d min=%d max=%d step=%d", snd_ctl_name(ctlDev), ctlName, ctlCount, ctlMin, ctlMax, ctlStep);
- goto OnErrorExit;
- }
- }
-
- // Fulup needed to be tested with some dB expert !!!
- json_object *dbscaleJ;
- if (json_object_object_get_ex(ctlJ, "dbscale", &dbscaleJ)) {
- int min, max;
-
- if (json_object_get_type(dbscaleJ) != json_type_object) {
- afb_req_fail_f(request, "ctl-invalid-dbscale", "devid=%s crl=%s invalid json in integer control", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
- goto OnErrorExit;
-
- json_object_object_get_ex(ctlJ, "min", &tmpJ);
- min = json_object_get_int(tmpJ);
- if (min >= 0) {
- afb_req_fail_f(request, "ctl-invalid-dbscale", "devid=%s crl=%s min should be a negative number", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
- goto OnErrorExit;
- }
-
- // default value 0=mute
- json_object_object_get_ex(ctlJ, "max", &tmpJ);
- max = json_object_get_int(tmpJ);
-
- // default value 1dB
- json_object_object_get_ex(ctlJ, "step", &tmpJ);
- int step = json_object_get_int(tmpJ);
- if (step <= 0) step = 1;
-
- elemTlv = allocate_int_dbscale_tlv(min, max, step);
-
- }
- } else {
- // provide a fake linear TLV
- elemTlv = allocate_int_linear_tlv(ctlMin, ctlMax);
- }
- break;
-
- case SND_CTL_ELEM_TYPE_ENUMERATED:
-
- if (shouldCreate) {
- json_object *enumsJ;
- json_object_object_get_ex(ctlJ, "enums", &enumsJ);
- if (json_object_get_type(enumsJ) != json_type_array) {
- afb_req_fail_f(request, "ctl-missing-enums", "devid=%s crl=%s mandatory enum=xxx missing in enumerated control", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
- goto OnErrorExit;
- }
-
- int length = json_object_array_length(enumsJ);
- const char **enumlabels = malloc(length * sizeof (char*));
-
- for (int jdx = 0; jdx < length; jdx++) {
- tmpJ = json_object_array_get_idx(enumsJ, jdx);
- enumlabels[jdx] = json_object_get_string(tmpJ);
- }
-
- err = snd_ctl_add_enumerated_elem_set(ctlDev, elemInfo, 1, ctlCount, length, enumlabels);
- if (err) {
- afb_req_fail_f(request, "ctl-invalid-bool", "devid=%s crl=%s invalid enumerated control", snd_ctl_name(ctlDev), json_object_get_string(ctlJ));
- goto OnErrorExit;
- }
-
- // Fulup should be an empty container
- elemTlv = allocate_bool_fake_tlv();
- }
- break;
-
- // Long Term Waiting ToDoList
- case SND_CTL_ELEM_TYPE_INTEGER64:
- case SND_CTL_ELEM_TYPE_BYTES:
- default:
- afb_req_fail_f(request, "ctl-invalid-type", "crl=%s unsupported type type=%d numid=%d", json_object_get_string(ctlJ), ctlType, ctlNumid);
- goto OnErrorExit;
- }
-
-UpdateDefaultVal:
-
- // Set Value to default
- snd_ctl_elem_value_alloca(&elemValue);
- for (int idx = 0; idx < snd_ctl_elem_info_get_count(elemInfo); idx++) {
- snd_ctl_elem_value_set_integer(elemValue, idx, ctlValue);
- }
-
- // write default values in newly created control
- snd_ctl_elem_id_alloca(&elemId);
- snd_ctl_elem_info(ctlDev, elemInfo);
- snd_ctl_elem_info_get_id(elemInfo, elemId);
- snd_ctl_elem_value_set_id(elemValue, elemId);
- err = snd_ctl_elem_write(ctlDev, elemValue);
- if (err < 0) {
- AFB_WARNING("addOneSndCtl: crl=%s numid=%d fail to write Values error=%s", json_object_get_string(ctlJ), snd_ctl_elem_info_get_numid(elemInfo), snd_strerror(err));
- goto DoNotUpdate;
- }
-
- // write a default null TLV (if usefull should be implemented for every ctl type)
- if (elemTlv) {
- err = snd_ctl_elem_tlv_write(ctlDev, elemId, elemTlv);
- if (err < 0) {
- AFB_WARNING("addOneSndCtl: crl=%s numid=%d fail to write TLV error=%s", json_object_get_string(ctlJ), snd_ctl_elem_info_get_numid(elemInfo), snd_strerror(err));
- goto DoNotUpdate;
- }
- }
-
-DoNotUpdate:
- // return newly created as a JSON object
- alsaGetSingleCtl(ctlDev, elemId, &ctlRequest, queryMode);
- if (ctlRequest.used < 0) {
- AFB_WARNING("addOneSndCtl: crl=%s numid=%d Fail to get value", json_object_get_string(ctlJ), snd_ctl_elem_info_get_numid(elemInfo));
- }
- return ctlRequest.valuesJ;
-
-OnErrorExit:
- return NULL;
-}
-
-PUBLIC void alsaAddCustomCtls(afb_req request) {
- int err;
- json_object *ctlsJ, *ctlsValues, *ctlValues;
- enum json_type;
- snd_ctl_t *ctlDev = NULL;
- const char *devid, *mode;
-
- devid = afb_req_value(request, "devid");
- if (devid == NULL) {
- afb_req_fail_f(request, "devid-missing", "devid MUST be defined for alsaAddCustomCtls");
- goto OnErrorExit;
- }
-
- // open control interface for devid
- err = snd_ctl_open(&ctlDev, devid, 0);
- if (err < 0) {
- afb_req_fail_f(request, "devid-unknown", "SndCard devid=[%s] Not Found err=%s", devid, snd_strerror(err));
- goto OnErrorExit;
- }
-
- // get verbosity level
- halQueryMode queryMode = QUERY_QUIET;
- mode = afb_req_value(request, "mode");
- if (mode != NULL) {
- sscanf(mode, "%i", (int*) &queryMode);
- }
-
- // extract sound controls and parse json
- ctlsJ = json_tokener_parse(afb_req_value(request, "ctl"));
- if (!ctlsJ) {
- afb_req_fail_f(request, "ctls-missing", "ctls MUST be defined as a JSON array for alsaAddCustomCtls");
- goto OnErrorExit;
- }
-
- switch (json_object_get_type(ctlsJ)) {
- case json_type_object:
- ctlsValues = addOneSndCtl(request, ctlDev, ctlsJ, queryMode);
- if (!ctlsValues) goto OnErrorExit;
- break;
-
- case json_type_array:
- ctlsValues = json_object_new_array();
- for (int idx = 0; idx < json_object_array_length(ctlsJ); idx++) {
- json_object *ctlJ = json_object_array_get_idx(ctlsJ, idx);
- ctlValues = addOneSndCtl(request, ctlDev, ctlJ, queryMode);
- if (ctlValues) json_object_array_add(ctlsValues, ctlValues);
- else goto OnErrorExit;
- }
- break;
-
- default:
- afb_req_fail_f(request, "ctls-invalid", "ctls=%s not valid JSON array", json_object_get_string(ctlsJ));
- goto OnErrorExit;
- }
-
- // get ctl as a json response
- afb_req_success(request, ctlsValues, NULL);
-
-OnErrorExit:
- if (ctlDev) snd_ctl_close(ctlDev);
- return;
-}