summaryrefslogtreecommitdiffstats
path: root/Alsa/core-binding/AlsaLibMapping.c
diff options
context:
space:
mode:
Diffstat (limited to 'Alsa/core-binding/AlsaLibMapping.c')
-rw-r--r--Alsa/core-binding/AlsaLibMapping.c728
1 files changed, 0 insertions, 728 deletions
diff --git a/Alsa/core-binding/AlsaLibMapping.c b/Alsa/core-binding/AlsaLibMapping.c
deleted file mode 100644
index 59ce8ff..0000000
--- a/Alsa/core-binding/AlsaLibMapping.c
+++ /dev/null
@@ -1,728 +0,0 @@
-/*
- * 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
-
-*/
-
-#define _GNU_SOURCE // needed for vasprintf
-
-#include <alsa/asoundlib.h>
-#include "AlsaLibMapping.h"
-
-#include <systemd/sd-event.h>
-
-// generic structure to pass parsed query values
-typedef struct {
- const char *devid;
- int numid;
- int quiet;
-} queryValuesT;
-
-// generic sndctrl event handle hook to event callback when pooling
-typedef struct {
- struct pollfd pfds;
- sd_event_source *src;
- snd_ctl_t *ctl;
- struct afb_event afbevt;
-} evtHandleT;
-
-typedef struct {
- int cardid;
- int ucount;
- evtHandleT *evtHandle;
-} sndHandleT;
-
-
-
-
-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) {
- 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);
- 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) {
- snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
- json_object_array_add(arrayJson, json_object_new_string(label));
- size -= (unsigned int) sizeof (unsigned int);
- }
- json_object_object_add(dbscaleJson, "array", arrayJson);
- } else {
- 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));
- }
- 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) {
- snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
- json_object_array_add(arrayJson, json_object_new_string(label));
- size -= (unsigned int) sizeof (unsigned int);
- }
- json_object_object_add(dbLinearJson, "offset", arrayJson);
- } else {
- json_object_object_add(dbLinearJson, "min", DB2StringJsonOject((int) tlv[2]));
- json_object_object_add(dbLinearJson, "max", DB2StringJsonOject((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) {
- snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
- json_object_array_add(arrayJson, json_object_new_string(label));
- size -= (unsigned int) sizeof (unsigned int);
- }
- json_object_object_add(dbRangeJson, "dbrange", arrayJson);
- break;
- }
- while (size > 0) {
- json_object * embedJson = json_object_new_object();
- snprintf(label, sizeof (label), "%i,", tlv[idx++]);
- json_object_object_add(embedJson, "rangemin", json_object_new_string(label));
- snprintf(label, sizeof (label), "%i", tlv[idx++]);
- json_object_object_add(embedJson, "rangemax", json_object_new_string(label));
- embedJson = decodeTlv(tlv + idx, 4 * sizeof (unsigned int));
- 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) {
- snprintf(label, sizeof (label), "0x%08x,", tlv[idx++]);
- json_object_array_add(arrayJson, json_object_new_string(label));
- size -= (unsigned int) sizeof (unsigned int);
- }
- json_object_object_add(dbMinMaxJson, "array", arrayJson);
-
- } else {
- json_object_object_add(dbMinMaxJson, "min", DB2StringJsonOject((int) tlv[2]));
- json_object_object_add(dbMinMaxJson, "max", DB2StringJsonOject((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 *sndcard;
- snd_ctl_t *handle;
- snd_ctl_card_info_t *cardinfo;
- int err;
-
-
- snd_ctl_card_info_alloca(&cardinfo);
-
- if ((err = snd_ctl_open(&handle, rqtSndId, 0)) < 0) {
- INFO (afbIface, "SndCard [%s] Not Found", rqtSndId);
- return NULL;
- }
-
- if ((err = snd_ctl_card_info(handle, cardinfo)) < 0) {
- snd_ctl_close(handle);
- WARNING (afbIface, "SndCard [%s] info error: %s", rqtSndId, snd_strerror(err));
- return NULL;
- }
-
- // start a new json object to store card info
- sndcard = json_object_new_object();
-
- devid= snd_ctl_card_info_get_id(cardinfo);
- json_object_object_add (sndcard, "devid" , json_object_new_string(devid));
- name = snd_ctl_card_info_get_name(cardinfo);
- json_object_object_add (sndcard, "name", json_object_new_string (name));
-
- if (afbIface->verbosity > 1) {
- json_object_object_add (sndcard, "devid", json_object_new_string(rqtSndId));
- driver= snd_ctl_card_info_get_driver(cardinfo);
- json_object_object_add (sndcard, "driver" , json_object_new_string(driver));
- info = strdup(snd_ctl_card_info_get_longname (cardinfo));
- json_object_object_add (sndcard, "info" , json_object_new_string (info));
- INFO (afbIface, "AJG: Soundcard Devid=%-5s Cardid=%-7s Name=%s\n", rqtSndId, devid, info);
- }
-
- // free card handle and return info
- snd_ctl_close(handle);
- return (sndcard);
-}
-
-// Loop on every potential Sound card and register active one
-PUBLIC void alsaGetInfo (struct afb_req request) {
- int card;
- json_object *sndcard, *sndcards;
- 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
- sndcard = alsaCardProbe (rqtSndId);
- if (sndcard != NULL) afb_req_success(request, sndcard, NULL);
- else afb_req_fail_f (request, "SndCard [%s] Not Found", rqtSndId);
-
- } else {
- // return an array of sndcard
- sndcards =json_object_new_array();
-
- // loop on potential card number
- for (card =0; card < 32; card++) {
-
- // build card devid and probe it
- snprintf (devid, sizeof(devid), "hw:%i", card);
- sndcard = alsaCardProbe (devid);
-
- // Alsa has hole within card list [ignore them]
- if (sndcard != NULL) {
- // add current sndcard to sndcards object
- json_object_array_add (sndcards, sndcard);
- }
- }
- afb_req_success (request, sndcards, 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);
-}
-
-
-
-// pack element from ALSA control into a JSON object
-STATIC json_object * alsaGetSingleCtl (snd_hctl_elem_t *elem, snd_ctl_elem_info_t *info, queryValuesT *queryValues) {
-
- int err;
- json_object *jsonAlsaCtl,*jsonClassCtl;
- snd_ctl_elem_id_t *elemid;
- snd_ctl_elem_type_t elemtype;
- snd_ctl_elem_value_t *control;
- int count, idx;
-
- // allocate ram for ALSA elements
- snd_ctl_elem_value_alloca(&control);
- snd_ctl_elem_id_alloca (&elemid);
-
- // get elemId out of elem
- snd_hctl_elem_get_id(elem, elemid);
-
- // when ctrlid is set, return only this ctrl
- if (queryValues->numid != -1 && queryValues->numid != snd_ctl_elem_id_get_numid(elemid)) return NULL;
-
- // build a json object out of element
- jsonAlsaCtl = json_object_new_object(); // http://alsa-lib.sourcearchive.com/documentation/1.0.24.1-3/group__Control_ga4e4f251147f558bc2ad044e836e449d9.html
- json_object_object_add (jsonAlsaCtl,"numid", json_object_new_int(snd_ctl_elem_id_get_numid (elemid)));
- if (queryValues->quiet < 2) json_object_object_add (jsonAlsaCtl,"name" , json_object_new_string(snd_ctl_elem_id_get_name (elemid)));
- if (queryValues->quiet < 1) json_object_object_add (jsonAlsaCtl,"iface", json_object_new_string(snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(elemid))));
- if (queryValues->quiet < 3)json_object_object_add (jsonAlsaCtl,"actif", json_object_new_boolean(!snd_ctl_elem_info_is_inactive(info)));
-
- elemtype = snd_ctl_elem_info_get_type(info);
-
- // number item and value(s) within control.
- count = snd_ctl_elem_info_get_count (info);
-
- if (snd_ctl_elem_info_is_readable(info)) {
- json_object *jsonValuesCtl = json_object_new_array();
-
- if ((err = snd_hctl_elem_read(elem, control)) < 0) {
- json_object *jsonValuesCtl = json_object_new_object();
- json_object_object_add (jsonValuesCtl,"error", json_object_new_string(snd_strerror(err)));
- } else {
- 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(control, idx)));
- break;
- }
- case SND_CTL_ELEM_TYPE_INTEGER:
- json_object_array_add (jsonValuesCtl, json_object_new_int ((int)snd_ctl_elem_value_get_integer(control, idx)));
- break;
- case SND_CTL_ELEM_TYPE_INTEGER64:
- json_object_array_add (jsonValuesCtl, json_object_new_int64 (snd_ctl_elem_value_get_integer64(control, idx)));
- break;
- case SND_CTL_ELEM_TYPE_ENUMERATED:
- json_object_array_add (jsonValuesCtl, json_object_new_int (snd_ctl_elem_value_get_enumerated(control, idx)));
- break;
- case SND_CTL_ELEM_TYPE_BYTES:
- json_object_array_add (jsonValuesCtl, json_object_new_int ((int)snd_ctl_elem_value_get_byte(control, 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(control, &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 (jsonAlsaCtl,"value",jsonValuesCtl);
- }
-
-
- if (!queryValues->quiet) { // in simple mode do not print usable values
- jsonClassCtl = json_object_new_object();
- json_object_object_add (jsonClassCtl,"type" , json_object_new_string(snd_ctl_elem_type_name(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(info)));
- json_object_object_add (jsonClassCtl,"max", json_object_new_int((int)snd_ctl_elem_info_get_max(info)));
- json_object_object_add (jsonClassCtl,"step", json_object_new_int((int)snd_ctl_elem_info_get_step(info)));
- break;
- case SND_CTL_ELEM_TYPE_INTEGER64:
- json_object_object_add (jsonClassCtl,"min", json_object_new_int64(snd_ctl_elem_info_get_min64(info)));
- json_object_object_add (jsonClassCtl,"max", json_object_new_int64(snd_ctl_elem_info_get_max64(info)));
- json_object_object_add (jsonClassCtl,"step", json_object_new_int64(snd_ctl_elem_info_get_step64(info)));
- break;
- case SND_CTL_ELEM_TYPE_ENUMERATED: {
- unsigned int item, items = snd_ctl_elem_info_get_items(info);
- json_object *jsonEnum = json_object_new_array();
-
- for (item = 0; item < items; item++) {
- snd_ctl_elem_info_set_item(info, item);
- if ((err = snd_hctl_elem_info(elem, info)) >= 0) {
- json_object_array_add (jsonEnum, json_object_new_string(snd_ctl_elem_info_get_item_name(info)));
- }
- }
- 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 (jsonAlsaCtl,"ctrl", jsonClassCtl);
- json_object_object_add (jsonAlsaCtl,"acl" , getControlAcl (info));
-
- // check for tlv [direct port from amixer.c]
- if (snd_ctl_elem_info_is_tlv_readable(info)) {
- unsigned int *tlv;
- tlv = malloc(4096);
- if ((err = snd_hctl_elem_tlv_read(elem, tlv, 4096)) < 0) {
- fprintf (stderr, "Control %s element TLV read error\n", snd_strerror(err));
- free(tlv);
- } else {
- json_object_object_add (jsonAlsaCtl,"tlv", decodeTlv (tlv, 4096));
- }
- }
- }
- return (jsonAlsaCtl);
-}
-
-
-PUBLIC void alsaGetCtl(struct afb_req request) {
- int err = 0;
- snd_hctl_t *handle;
- snd_hctl_elem_t *elem;
- snd_ctl_elem_info_t *info;
- json_object *sndctrls, *control;
- queryValuesT queryValues;
-
- // get API params
- queryValues.devid = afb_req_value(request, "devid");
-
- const char *rqtNumid = afb_req_value(request, "numid");
- if (!rqtNumid) queryValues.numid=-1;
- else if (rqtNumid && ! sscanf (rqtNumid, "%d", &queryValues.numid)) {
- json_object *query = afb_req_json(request);
-
- afb_req_fail_f (request, "Query=%s NumID not integer &numid=%s&", json_object_to_json_string(query), rqtNumid);
- goto ExitOnError;
- };
-
- const char *rqtQuiet = afb_req_value(request, "quiet");
- if (!rqtQuiet) queryValues.quiet=99; // default super quiet
- else if (rqtQuiet && ! sscanf (rqtQuiet, "%d", &queryValues.quiet)) {
- json_object *query = afb_req_json(request);
-
- afb_req_fail_f (request, "Query=%s NumID not integer &numid=%s&", json_object_to_json_string(query), rqtQuiet);
- goto ExitOnError;
- };
-
- // Open sound we use Alsa high level API like amixer.c
- if (!queryValues.devid || (err = snd_hctl_open(&handle, queryValues.devid, 0)) < 0) {
- afb_req_fail_f (request, "alsaGetControl devid=[%s] open fail error=%s\n", queryValues.devid, snd_strerror(err));
- goto ExitOnError;
- }
-
- if ((err = snd_hctl_load(handle)) < 0) {
- afb_req_fail_f (request, "alsaGetControl devid=[%s] load fail error=%s\n", queryValues.devid, snd_strerror(err));
- goto ExitOnError;
- }
-
- // allocate ram for ALSA elements
- snd_ctl_elem_info_alloca(&info);
-
- // create an json array to hold all sndcard response
- sndctrls = json_object_new_array();
-
- for (elem = snd_hctl_first_elem(handle); elem != NULL; elem = snd_hctl_elem_next(elem)) {
-
- if ((err = snd_hctl_elem_info(elem, info)) < 0) {
- json_object_put(sndctrls); // we abandon request let's free response
- afb_req_fail_f (request, "alsaGetControl devid=[%s/%s] snd_hctl_elem_info error: %s\n"
- , queryValues.devid, snd_hctl_name(handle), snd_strerror(err));
- goto ExitOnError;
- }
-
- // each control is added into a JSON array
- control = alsaGetSingleCtl(elem, info, &queryValues);
- if (control) json_object_array_add(sndctrls, control);
-
- }
-
- afb_req_success (request, sndctrls, NULL);
- return;
-
- // nothing special only for debugger breakpoint
- ExitOnError:
- return;
-}
-
-// This routine is called when ALSA event are fired
-STATIC int sndCtlEventCB (sd_event_source* src, int fd, uint32_t revents, void* userData) {
- int err;
- evtHandleT *evtHandle = (evtHandleT*)userData;
- snd_ctl_event_t *ctlEvent;
- json_object *ctlEventJson;
- unsigned int mask;
- int numid;
- int iface;
- int device;
- int subdev;
- const char*devname;
- int index;
-
- if ((revents & EPOLLHUP) != 0) {
- NOTICE (afbIface, "SndCtl hanghup [car disconnected]");
- goto ExitOnSucess;
- }
-
- if ((revents & EPOLLIN) != 0) {
-
- snd_ctl_event_alloca(&ctlEvent); // initialise event structure on stack
-
- err = snd_ctl_read(evtHandle->ctl, ctlEvent);
- if (err < 0) goto ExitOnError;
-
- // we only process sndctrl element
- if (snd_ctl_event_get_type(ctlEvent) != SND_CTL_EVENT_ELEM) goto ExitOnSucess;
-
- // we only process value changed events
- mask = snd_ctl_event_elem_get_mask(ctlEvent);
- if (!(mask & SND_CTL_EVENT_MASK_VALUE)) goto ExitOnSucess;
-
- numid = snd_ctl_event_elem_get_numid(ctlEvent);
- iface = snd_ctl_event_elem_get_interface(ctlEvent);
- device = snd_ctl_event_elem_get_device(ctlEvent);
- subdev = snd_ctl_event_elem_get_subdevice(ctlEvent);
- devname= snd_ctl_event_elem_get_name(ctlEvent);
- index = snd_ctl_event_elem_get_index(ctlEvent);
-
- DEBUG(afbIface, "sndCtlEventCB: (%i,%i,%i,%i,%s,%i)", numid, iface, device, subdev, devname, index);
-
- // proxy ctlevent as a binder event
- ctlEventJson = json_object_new_object();
- json_object_object_add(ctlEventJson, "numid" ,json_object_new_int (numid));
- json_object_object_add(ctlEventJson, "iface" ,json_object_new_int (iface));
- json_object_object_add(ctlEventJson, "device" ,json_object_new_int (device));
- json_object_object_add(ctlEventJson, "subdev" ,json_object_new_int (subdev));
- json_object_object_add(ctlEventJson, "devname",json_object_new_string (devname));
- json_object_object_add(ctlEventJson, "index" ,json_object_new_int (index));
- afb_event_push(evtHandle->afbevt, ctlEventJson);
- }
-
- ExitOnSucess:
- return 0;
-
- ExitOnError:
- WARNING (afbIface, "sndCtlEventCB: ignored unsupported event type");
- return (0);
-}
-
-// Loop on every potential Sound card and register active one
-PUBLIC void alsaSubCtl (struct afb_req request) {
- static sndHandleT sndHandles[MAX_SND_CARD];
- evtHandleT *evtHandle;
- snd_ctl_t *ctlHandle;
- snd_ctl_card_info_t *card_info;
- int err, idx, cardid;
- int idxFree=-1;
-
- const char *devid = afb_req_value(request, "devid");
- if (devid == NULL) {
- afb_req_fail_f (request, "devid-missing", "devid=hw:xxx missing");
- goto ExitOnError;
- }
-
- // open control interface for devid
- err = snd_ctl_open(&ctlHandle, devid, SND_CTL_READONLY);
- if (err < 0) {
- afb_req_fail_f (request, "devid-unknown", "SndCard devid=%s Not Found err=%d", devid, err);
- goto ExitOnError;
- }
-
- // get sound card index use to search existing subscription
- snd_ctl_card_info_alloca(&card_info);
- snd_ctl_card_info(ctlHandle, card_info);
- cardid = snd_ctl_card_info_get_card(card_info);
-
- // search for an existing subscription and mark 1st free slot
- for (idx= 0; idx < MAX_SND_CARD; idx ++) {
- if (sndHandles[idx].ucount > 0 && sndHandles[idx].cardid == cardid) {
- evtHandle= sndHandles[idx].evtHandle;
- break;
- } else if (idxFree == -1) idxFree= idx;
- };
-
- // if not subscription exist for the event let's create one
- if (idx == MAX_SND_CARD) {
-
- // reach MAX_SND_CARD event registration
- if (idxFree == -1) {
- afb_req_fail_f (request, "register-toomany", "Cannot register new event Maxcard==%devent name=%s", idx);
- snd_ctl_close(ctlHandle);
- goto ExitOnError;
- }
-
- evtHandle = malloc (sizeof(evtHandleT));
- evtHandle->ctl = ctlHandle;
- sndHandles[idxFree].ucount = 0;
- sndHandles[idxFree].cardid = cardid;
-
- // subscribe for sndctl events attached to devid
- err = snd_ctl_subscribe_events(evtHandle->ctl, 1);
- if (err < 0) {
- afb_req_fail_f (request, "subscribe-fail", "Cannot subscribe events from devid=%s err=%d", devid, err);
- snd_ctl_close(ctlHandle);
- goto ExitOnError;
- }
-
- // get pollfd attach to this sound board
- snd_ctl_poll_descriptors(evtHandle->ctl, &evtHandle->pfds, 1);
-
- // register sound event to binder main loop
- err = sd_event_add_io(afb_daemon_get_event_loop(afbIface->daemon), &evtHandle->src, evtHandle->pfds.fd, EPOLLIN, sndCtlEventCB, evtHandle);
- if (err < 0) {
- afb_req_fail_f (request, "register-mainloop", "Cannot hook events to mainloop devid=%s err=%d", devid, err);
- snd_ctl_close(ctlHandle);
- goto ExitOnError;
- }
-
- // create binder event attached to devid name
- evtHandle->afbevt = afb_daemon_make_event (afbIface->daemon, devid);
- if (!afb_event_is_valid (evtHandle->afbevt)) {
- afb_req_fail_f (request, "register-event", "Cannot register new binder event name=%s", devid);
- snd_ctl_close(ctlHandle);
- goto ExitOnError;
- }
-
- // everything looks OK let's move forward
- idx=idxFree;
- }
-
- // subscribe to binder event
- err = afb_req_subscribe(request, evtHandle->afbevt);
- if (err != 0) {
- afb_req_fail_f (request, "register-eventname", "Cannot subscribe binder event name=%s [invalid channel]", devid, err);
- goto ExitOnError;
- }
-
- json_object *ctlEventJson = json_object_new_object();
- json_object_object_add(ctlEventJson, "test",json_object_new_string ("done"));
- afb_event_push(evtHandle->afbevt, ctlEventJson );
-
- // increase usage count and return success
- sndHandles[idx].ucount ++;
- afb_req_success(request, NULL, NULL);
- return;
-
- ExitOnError:
- return;
-}