diff options
Diffstat (limited to 'ALSA-afb/Alsa-RegEvt.c')
| -rw-r--r-- | ALSA-afb/Alsa-RegEvt.c | 395 |
1 files changed, 0 insertions, 395 deletions
diff --git a/ALSA-afb/Alsa-RegEvt.c b/ALSA-afb/Alsa-RegEvt.c deleted file mode 100644 index 080b6cc..0000000 --- a/ALSA-afb/Alsa-RegEvt.c +++ /dev/null @@ -1,395 +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. - - */ - -#define _GNU_SOURCE // needed for vasprintf - -#include "Alsa-ApiHat.h" - -// generic sndctrl event handle hook to event callback when pooling - -typedef struct { - struct pollfd pfds; - sd_event_source *src; - snd_ctl_t *ctlDev; - int mode; - struct afb_event afbevt; -} evtHandleT; - -typedef struct { - int ucount; - int cardId; - evtHandleT *evtHandle; -} sndHandleT; - -typedef struct { - char *devid; - char *apiprefix; - char *shortname; - char *longname; -} cardRegistryT; - -cardRegistryT *cardRegistry[MAX_SND_CARD + 1]; - -PUBLIC json_object *alsaCheckQuery(afb_req request, queryValuesT *queryValues) { - - json_object *tmpJ; - int done; - - // get query from request - json_object *queryInJ = afb_req_json(request); - - done = json_object_object_get_ex(queryInJ, "devid", &tmpJ); - if (!done) { - afb_req_fail_f(request, "devid-missing", "Invalid query='%s'", json_object_get_string(queryInJ)); - goto OnErrorExit; - } - queryValues->devid = json_object_get_string(tmpJ); - - done = json_object_object_get_ex(queryInJ, "mode", &tmpJ); - if (!done) queryValues->mode = QUERY_QUIET; // default quiet - else queryValues->mode = json_object_get_int(tmpJ); - - return queryInJ; - -OnErrorExit: - return NULL; -} - -// 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, ctlNumid; - evtHandleT *evtHandle = (evtHandleT*) userData; - snd_ctl_event_t *eventId; - json_object *ctlEventJ; - unsigned int mask; - int iface; - int device; - int subdev; - const char*ctlName; - ctlRequestT ctlRequest; - snd_ctl_elem_id_t *elemId; - - if ((revents & EPOLLHUP) != 0) { - AFB_NOTICE("SndCtl hanghup [car disconnected]"); - goto ExitOnSucess; - } - - if ((revents & EPOLLIN) != 0) { - - // initialise event structure on stack - snd_ctl_event_alloca(&eventId); - snd_ctl_elem_id_alloca(&elemId); - - err = snd_ctl_read(evtHandle->ctlDev, eventId); - if (err < 0) goto OnErrorExit; - - // we only process sndctrl element - if (snd_ctl_event_get_type(eventId) != SND_CTL_EVENT_ELEM) goto ExitOnSucess; - - // we only process value changed events - mask = snd_ctl_event_elem_get_mask(eventId); - if (!(mask & SND_CTL_EVENT_MASK_VALUE)) goto ExitOnSucess; - - snd_ctl_event_elem_get_id(eventId, elemId); - - err = alsaGetSingleCtl(evtHandle->ctlDev, elemId, &ctlRequest, evtHandle->mode); - if (err) goto OnErrorExit; - - // If CTL as a value use it as container for response - if (ctlRequest.valuesJ) ctlEventJ = ctlRequest.valuesJ; - else { - ctlEventJ = json_object_new_object(); - ctlNumid = snd_ctl_event_elem_get_numid(eventId); - json_object_object_add(ctlEventJ, "id", json_object_new_int(ctlNumid)); - } - - if (evtHandle->mode >= QUERY_COMPACT) { - ctlName = snd_ctl_event_elem_get_name(eventId); - json_object_object_add(ctlEventJ, "name", json_object_new_string(ctlName)); - } - - if (evtHandle->mode >= QUERY_VERBOSE) { - iface = snd_ctl_event_elem_get_interface(eventId); - device = snd_ctl_event_elem_get_device(eventId); - subdev = snd_ctl_event_elem_get_subdevice(eventId); - json_object_object_add(ctlEventJ, "ifc", json_object_new_int(iface)); - json_object_object_add(ctlEventJ, "dev", json_object_new_int(device)); - json_object_object_add(ctlEventJ, "sub", json_object_new_int(subdev)); - } - - - AFB_DEBUG("sndCtlEventCB=%s", json_object_get_string(ctlEventJ)); - afb_event_push(evtHandle->afbevt, ctlEventJ); - } - -ExitOnSucess: - return 0; - -OnErrorExit: - AFB_WARNING("sndCtlEventCB: ignored unsupported event type"); - return (0); -} - -// Subscribe to every Alsa CtlEvent send by a given board - -PUBLIC void alsaEvtSubcribe(afb_req request) { - static sndHandleT sndHandles[MAX_SND_CARD]; - evtHandleT *evtHandle = NULL; - snd_ctl_t *ctlDev = NULL; - int err, idx, cardId, idxFree = -1; - snd_ctl_card_info_t *cardinfo; - queryValuesT queryValues; - - json_object *queryJ = alsaCheckQuery(request, &queryValues); - if (!queryJ) goto OnErrorExit; - - // open control interface for devid - err = snd_ctl_open(&ctlDev, queryValues.devid, SND_CTL_READONLY); - if (err < 0) { - afb_req_fail_f(request, "devid-unknown", "SndCard devid=%s Not Found err=%s", queryValues.devid, snd_strerror(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; - } - - cardId = snd_ctl_card_info_get_card(cardinfo); - - // search for an existing subscription and mark 1st free slot - for (idx = 0; idx < MAX_SND_CARD; idx++) { - if (sndHandles[idx].ucount > 0 && cardId == sndHandles[idx].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==%d", idx); - goto OnErrorExit; - } - - evtHandle = malloc(sizeof (evtHandleT)); - evtHandle->ctlDev = ctlDev; - evtHandle->mode = queryValues.mode; - sndHandles[idxFree].ucount = 0; - sndHandles[idxFree].cardId = cardId; - sndHandles[idxFree].evtHandle = evtHandle; - - // subscribe for sndctl events attached to devid - err = snd_ctl_subscribe_events(evtHandle->ctlDev, 1); - if (err < 0) { - afb_req_fail_f(request, "subscribe-fail", "Cannot subscribe events from devid=%s err=%d", queryValues.devid, err); - goto OnErrorExit; - } - - // get pollfd attach to this sound board - snd_ctl_poll_descriptors(evtHandle->ctlDev, &evtHandle->pfds, 1); - - // register sound event to binder main loop - err = sd_event_add_io(afb_daemon_get_event_loop(), &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", queryValues.devid, err); - goto OnErrorExit; - } - - // create binder event attached to devid name - evtHandle->afbevt = afb_daemon_make_event(queryValues.devid); - if (!afb_event_is_valid(evtHandle->afbevt)) { - afb_req_fail_f(request, "register-event", "Cannot register new binder event name=%s", queryValues.devid); - goto OnErrorExit; - } - - // 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]", queryValues.devid); - goto OnErrorExit; - } - - // increase usage count and return success - sndHandles[idx].ucount++; - afb_req_success(request, NULL, NULL); - return; - -OnErrorExit: - if (ctlDev) snd_ctl_close(ctlDev); - return; -} - -// Subscribe to every Alsa CtlEvent send by a given board - -STATIC json_object *alsaProbeCardId(afb_req request) { - char devid [10]; - const char *ctlName, *shortname, *longname; - int card, err, index, idx; - json_object *responseJ; - snd_ctl_t *ctlDev; - snd_ctl_card_info_t *cardinfo; - - const char *sndname = afb_req_value(request, "sndname"); - if (sndname == NULL) { - afb_req_fail_f(request, "argument-missing", "sndname=SndCardName missing"); - goto OnErrorExit; - } - - // loop on potential card number - snd_ctl_card_info_alloca(&cardinfo); - for (card = 0; card < MAX_SND_CARD; card++) { - - // build card devid and probe it - snprintf(devid, sizeof (devid), "hw:%i", card); - - // open control interface for devid - err = snd_ctl_open(&ctlDev, devid, SND_CTL_READONLY); - if (err < 0) continue; - - // extract sound card information - snd_ctl_card_info(ctlDev, cardinfo); - index = snd_ctl_card_info_get_card(cardinfo); - ctlName = snd_ctl_card_info_get_id(cardinfo); - shortname = snd_ctl_card_info_get_name(cardinfo); - longname = snd_ctl_card_info_get_longname(cardinfo); - - // check if short|long name match - if (!strcmp(sndname, ctlName)) break; - if (!strcmp(sndname, shortname)) break; - if (!strcmp(sndname, longname)) break; - } - - if (card == MAX_SND_CARD) { - afb_req_fail_f(request, "ctlDev-notfound", "Fail to find card with name=%s", sndname); - goto OnErrorExit; - } - - // proxy ctlevent as a binder event - responseJ = json_object_new_object(); - json_object_object_add(responseJ, "index", json_object_new_int(index)); - json_object_object_add(responseJ, "devid", json_object_new_string(devid)); - json_object_object_add(responseJ, "shortname", json_object_new_string(shortname)); - json_object_object_add(responseJ, "longname", json_object_new_string(longname)); - - // search for a HAL binder card mapping name to api prefix - for (idx = 0; (idx < MAX_SND_CARD && cardRegistry[idx]); idx++) { - if (!strcmp(cardRegistry[idx]->shortname, shortname)) { - json_object_object_add(responseJ, "halapi", json_object_new_string(cardRegistry[idx]->apiprefix)); - break; - } - } - - return responseJ; - -OnErrorExit: - return NULL; -} - -// Make alsaProbeCardId compatible with AFB request - -PUBLIC void alsaGetCardId(afb_req request) { - - json_object *responseJ = alsaProbeCardId(request); - if (responseJ) afb_req_success(request, responseJ, NULL); -} - -// Return list of active resgistrated HAL with corresponding sndcard - -PUBLIC void alsaActiveHal(afb_req request) { - json_object *responseJ = json_object_new_array(); - - for (int idx = 0; idx < MAX_SND_CARD; idx++) { - if (!cardRegistry[idx]) break; - - json_object *haldevJ = json_object_new_object(); - json_object_object_add(haldevJ, "api", json_object_new_string(cardRegistry[idx]->apiprefix)); - if (cardRegistry[idx]->devid) json_object_object_add(haldevJ, "devid", json_object_new_string(cardRegistry[idx]->devid)); - if (cardRegistry[idx]->shortname)json_object_object_add(haldevJ, "shortname", json_object_new_string(cardRegistry[idx]->shortname)); - if (cardRegistry[idx]->longname) json_object_object_add(haldevJ, "longname", json_object_new_string(cardRegistry[idx]->longname)); - json_object_array_add(responseJ, haldevJ); - } - - afb_req_success(request, responseJ, NULL); -} - - -// Register loaded HAL with board Name and API prefix - -PUBLIC void alsaRegisterHal(afb_req request) { - static int index = 0; - json_object *responseJ; - const char *shortname, *apiPrefix; - - apiPrefix = afb_req_value(request, "prefix"); - if (apiPrefix == NULL) { - afb_req_fail_f(request, "argument-missing", "prefix=BindingApiPrefix missing"); - goto OnErrorExit; - } - - shortname = afb_req_value(request, "sndname"); - if (shortname == NULL) { - afb_req_fail_f(request, "argument-missing", "sndname=SndCardName missing"); - goto OnErrorExit; - } - - if (index == MAX_SND_CARD) { - afb_req_fail_f(request, "alsahal-toomany", "Fail to register sndname=[%s]", shortname); - goto OnErrorExit; - } - - // alsaGetCardId should be check to register only valid card - responseJ = alsaProbeCardId(request); - if (responseJ) { - json_object *tmpJ; - int done; - - cardRegistry[index] = malloc(sizeof (cardRegistry)); - cardRegistry[index]->apiprefix = strdup(apiPrefix); - cardRegistry[index]->shortname = strdup(shortname); - - done = json_object_object_get_ex(responseJ, "devid", &tmpJ); - if (done) cardRegistry[index]->devid = strdup(json_object_get_string(tmpJ)); - else cardRegistry[index]->devid = NULL; - - done = json_object_object_get_ex(responseJ, "longname", &tmpJ); - if (done) cardRegistry[index]->longname = strdup(json_object_get_string(tmpJ)); - else cardRegistry[index]->longname = NULL; - - // make sure register close with a null value - index++; - cardRegistry[index] = NULL; - - afb_req_success(request, responseJ, NULL); - } - - // If OK return sound card Alsa ID+Info - return; - -OnErrorExit: - return; -} - |