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/*
* Copyright (C) 2018 "IoT.bzh"
* Author 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-softmixer.h"
#include <string.h>
PUBLIC AlsaLoopSubdevT *ApiLoopFindSubdev(SoftMixerT *mixer, const char *streamUid, const char *targetUid, AlsaSndLoopT **loop) {
// Either allocate a free loop subdev or search for a specific targetUid when specified
AlsaSndLoopT * _loop;
if (targetUid) {
cds_list_for_each_entry(_loop, &mixer->loops.list, list) {
AlsaLoopSubdevT * subdev;
cds_list_for_each_entry(subdev, &_loop->subdevs.list, list) {
if (subdev->uid && !strcmp(subdev->uid, targetUid)) {
*loop = _loop;
return subdev;
}
}
}
} else {
cds_list_for_each_entry(_loop, &mixer->loops.list, list) {
AlsaLoopSubdevT * subdev;
cds_list_for_each_entry(subdev, &_loop->subdevs.list, list) {
if (!subdev->uid) {
subdev->uid = streamUid;
*loop = _loop;
return subdev;
}
}
}
}
return NULL;
}
STATIC AlsaLoopSubdevT *ProcessOneSubdev(SoftMixerT *mixer, AlsaSndLoopT *loop, json_object *subdevJ) {
AFB_ApiDebug(mixer->api, "%s", __func__);
AlsaLoopSubdevT *subdev = calloc(1, sizeof (AlsaLoopSubdevT));
if (subdev == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
int error = wrap_json_unpack(subdevJ, "{s?s, si,si !}"
, "uid", &subdev->uid
, "subdev", &subdev->index
, "numid", &subdev->numid
);
if (error) {
AFB_ApiError(mixer->api,
"%s: loop=%s missing (uid|subdev|numid) error=%s json=%s",
__func__, loop->uid, wrap_json_get_error_string(error),json_object_get_string(subdevJ));
goto fail_subdev;
}
// subdev with no UID are dynamically attached
if (subdev->uid) {
subdev->uid = strdup(subdev->uid);
if (subdev->uid == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail_subdev;
}
}
// create loop subdev entry point with cardidx+device+subdev in order to open subdev and not sndcard
AlsaDevInfoT loopSubdev;
loopSubdev.devpath=NULL;
loopSubdev.cardid=NULL;
loopSubdev.pcmplug_params = NULL;
loopSubdev.cardidx = loop->sndcard->cid.cardidx;
loopSubdev.device = loop->capture;
loopSubdev.subdev = subdev->index;
// assert we may open this loopback subdev in capture mode
AlsaPcmCtlT *pcmCtl = AlsaByPathOpenPcmCtl(mixer, &loopSubdev, SND_PCM_STREAM_CAPTURE);
if (!pcmCtl) {
goto fail_subdev_uid;
}
pcmCtl->closeAtDeletion = true;
// free PCM as we only open loop to assert it's a valid capture device
AlsaPcmCtlDelete(mixer, pcmCtl);
AFB_ApiDebug(mixer->api, "%s DONE", __func__);
return subdev;
fail_subdev_uid:
free((char*)subdev->uid);
fail_subdev:
free(subdev);
fail:
return NULL;
}
static void freeSubdev(AlsaLoopSubdevT * subdev) {
if (subdev->uid)
free((char*)subdev->uid);
free(subdev);
}
STATIC AlsaSndLoopT *AttachOneLoop(SoftMixerT *mixer, const char *uid, json_object *argsJ) {
json_object *subdevsJ = NULL, *devicesJ = NULL;
int error;
AFB_ApiNotice(mixer->api, "%s, uid %s", __func__, uid);
AlsaSndLoopT *loop = calloc(1, sizeof (AlsaSndLoopT));
if (loop == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
CDS_INIT_LIST_HEAD(&loop->list);
CDS_INIT_LIST_HEAD(&loop->subdevs.list);
AlsaSndCtlT * sndctl = (AlsaSndCtlT*) calloc(1, sizeof (AlsaSndCtlT));
if (sndctl == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail_loop;
}
CDS_INIT_LIST_HEAD(&sndctl->registryList);
loop->sndcard = sndctl;
error = wrap_json_unpack(argsJ, "{ss,s?s,s?s,so,so !}"
, "uid", &loop->uid
, "path", &loop->sndcard->cid.devpath
, "cardid", &loop->sndcard->cid.cardid
, "devices", &devicesJ
, "subdevs", &subdevsJ
);
if (error || !loop->uid || !subdevsJ || (!loop->sndcard->cid.devpath && !loop->sndcard->cid.cardid)) {
AFB_ApiNotice(mixer->api, "%s mixer=%s hal=%s missing 'uid|path|cardid|devices|subdevs' error=%s args=%s",
__func__, mixer->uid, uid, wrap_json_get_error_string(error),json_object_get_string(argsJ));
goto fail_snd_card;
}
// try to open sound card control interface
loop->sndcard->ctl = AlsaByPathOpenCtl(mixer, loop->uid, loop->sndcard);
if (!loop->sndcard->ctl) {
AFB_ApiError(mixer->api, "%s mixer=%s hal=%s Fail open sndcard loop=%s devpath=%s cardid=%s (please check 'modprobe snd_aloop')",
__func__, mixer->uid, uid, loop->uid, loop->sndcard->cid.devpath, loop->sndcard->cid.cardid);
goto fail_snd_card;
}
// Default devices is playback=0 capture=1
if (!devicesJ) {
loop->playback = 0;
loop->capture = 1;
} else {
error = wrap_json_unpack(devicesJ, "{si,si !}", "capture", &loop->capture, "playback", &loop->playback);
if (error) {
AFB_ApiNotice(mixer->api, "%s mixer=%s hal=%s Loop=%s missing 'capture|playback' error=%s devices=%s",
__func__, mixer->uid, uid, loop->uid, wrap_json_get_error_string(error),json_object_get_string(devicesJ));
goto fail_snd_card_ctl;
}
}
AlsaLoopSubdevT * subdev;
switch (json_object_get_type(subdevsJ)) {
case json_type_object:
subdev = ProcessOneSubdev(mixer, loop, subdevsJ);
if (!subdev)
goto fail_loop_subdev;
loop->nbSubdevs++;
cds_list_add_tail(&subdev->list, &loop->subdevs.list);
break;
case json_type_array: {
int nbSubDevs = (int) json_object_array_length(subdevsJ);
for (int idx = 0; idx < nbSubDevs; idx++) {
json_object *subdevJ = json_object_array_get_idx(subdevsJ, idx);
subdev = ProcessOneSubdev(mixer, loop, subdevJ);
if (!subdev) {
goto fail_loop_subdev;
}
loop->nbSubdevs++;
cds_list_add_tail(&subdev->list, &loop->subdevs.list);
}
break;
}
default:
AFB_ApiError(mixer->api, "%s mixer=%s hal=%s Loop=%s invalid subdevs= %s",
__func__, mixer->uid, uid, loop->uid, json_object_get_string(subdevsJ));
goto fail_snd_card_ctl;
}
AFB_ApiNotice(mixer->api, "%s, uid %s DONE", __func__, uid);
return loop;
fail_loop_subdev: {
AFB_ApiDebug(mixer->api, "%s cleanup", __func__);
AlsaLoopSubdevT * subdev, *tmp;
cds_list_for_each_entry_safe(subdev, tmp, &loop->subdevs.list, list) {
cds_list_del(&subdev->list);
freeSubdev(subdev);
}
}
fail_snd_card_ctl:
snd_ctl_close(loop->sndcard->ctl);
fail_snd_card:
free(loop->sndcard);
fail_loop:
free(loop);
fail:
return NULL;
}
static void loopDestroy(SoftMixerT * mixer, void* arg) {
AlsaSndLoopT * loop = (AlsaSndLoopT*) arg;
AFB_ApiDebug(mixer->api, "%s... %s not implemented", __func__, loop->uid);
return;
if (loop->sndcard) {
if (loop->sndcard->ctl) {
snd_ctl_close(loop->sndcard->ctl);
free(loop->sndcard->ctl);
}
free(loop->sndcard);
}
AlsaLoopSubdevT * subdev, *tmp;
cds_list_for_each_entry_safe(subdev, tmp, &loop->subdevs.list, list) {
cds_list_del(&subdev->list);
freeSubdev(subdev);
}
mixer->nbLoops--;
free(loop);
}
static AlsaSndLoopT * loopCreate(SoftMixerT *mixer, const char *uid, json_object *argsJ) {
AlsaSndLoopT * newLoop = AttachOneLoop(mixer, uid, argsJ);
if (!newLoop) {
goto fail;
}
mixer->nbLoops++;
cds_list_add_tail(&newLoop->list, &mixer->loops.list);
AlsaMixerTransactionObjectAdd(mixer->transaction, newLoop, loopDestroy);
fail:
return newLoop;
}
PUBLIC int ApiLoopAttach(SoftMixerT *mixer, AFB_ReqT request, const char * uid, json_object * argsJ) {
AlsaSndLoopT * newLoop = NULL;
if (mixer->nbLoops >= mixer->max.loops) {
AFB_IfReqFailF(mixer, request, "too-small", "mixer=%s hal=%s max loop=%d", mixer->uid, uid, mixer->max.loops);
goto fail;
}
switch (json_object_get_type(argsJ)) {
size_t count;
case json_type_object:
newLoop = loopCreate(mixer, uid, argsJ);
if (!newLoop) {
goto fail;
}
break;
case json_type_array:
count = json_object_array_length(argsJ);
if (count > (mixer->max.loops - mixer->nbLoops)) {
AFB_IfReqFailF(mixer, request, "too-small", "mixer=%s hal=%s max loop=%d", mixer->uid, uid, mixer->max.loops);
goto fail_loop;
}
for (int idx = 0; idx < count; idx++) {
json_object *loopJ = json_object_array_get_idx(argsJ, idx);
newLoop = loopCreate(mixer, uid, loopJ);
if (newLoop == NULL) {
goto fail_loop;
}
}
break;
default:
AFB_IfReqFailF(mixer, request, "bad-loop", "mixer=%s hal=%s loops invalid argsJ= %s", mixer->uid, uid, json_object_get_string(argsJ));
goto fail;
}
return 0;
fail_loop:
fail:
return -1;
}
|
