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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
if (targetUid) {
for (int idx = 0; mixer->loops[idx]; idx++) {
for (int jdx = 0; jdx < mixer->loops[idx]->scount; jdx++) {
if (mixer->loops[idx]->subdevs[jdx]->uid && !strcasecmp(mixer->loops[idx]->subdevs[jdx]->uid, targetUid)) {
*loop = mixer->loops[idx];
return mixer->loops[idx]->subdevs[jdx];
}
}
}
} else {
for (int idx = 0; mixer->loops[idx]; idx++) {
for (int jdx = 0; mixer->loops[idx]->subdevs[jdx]; jdx++) {
if (!mixer->loops[idx]->subdevs[jdx]->uid) {
mixer->loops[idx]->subdevs[jdx]->uid = streamUid;
*loop = mixer->loops[idx];
return mixer->loops[idx]->subdevs[jdx];
}
}
}
}
return NULL;
}
STATIC AlsaLoopSubdevT *ProcessOneSubdev(SoftMixerT *mixer, AlsaSndLoopT *loop, json_object *subdevJ) {
AlsaLoopSubdevT *subdev = calloc(1, sizeof (AlsaPcmCtlT));
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, "ProcessOneSubdev: loop=%s missing (uid|subdev|numid) error=%s json=%s", loop->uid, wrap_json_get_error_string(error),json_object_get_string(subdevJ));
goto OnErrorExit;
}
// subdev with no UID are dynamically attached
if (subdev->uid) subdev->uid = strdup(subdev->uid);
// 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 *pcmInfo = AlsaByPathOpenPcm(mixer, &loopSubdev, SND_PCM_STREAM_CAPTURE);
if (!pcmInfo) goto OnErrorExit;
// free PCM as we only open loop to assert it's a valid capture device
snd_pcm_close(pcmInfo->handle);
free(pcmInfo);
return subdev;
OnErrorExit:
return NULL;
}
STATIC AlsaSndLoopT *AttachOneLoop(SoftMixerT *mixer, const char *uid, json_object *argsJ) {
AlsaSndLoopT *loop = calloc(1, sizeof (AlsaSndLoopT));
json_object *subdevsJ = NULL, *devicesJ = NULL;
int error;
loop->sndcard = (AlsaSndCtlT*) calloc(1, sizeof (AlsaSndCtlT));
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, "AttachOneLoop mixer=%s hal=%s missing 'uid|path|cardid|devices|subdevs' error=%s args=%s", mixer->uid, uid, wrap_json_get_error_string(error),json_object_get_string(argsJ));
goto OnErrorExit;
}
// try to open sound card control interface
loop->sndcard->ctl = AlsaByPathOpenCtl(mixer, loop->uid, loop->sndcard);
if (!loop->sndcard->ctl) {
AFB_ApiError(mixer->api, "AttachOneLoop mixer=%s hal=%s Fail open sndcard loop=%s devpath=%s cardid=%s (please check 'modprobe snd_aloop')", mixer->uid, uid, loop->uid, loop->sndcard->cid.devpath, loop->sndcard->cid.cardid);
goto OnErrorExit;
}
// Default devices is payback=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, "AttachOneLoop mixer=%s hal=%s Loop=%s missing 'capture|playback' error=%s devices=%s", mixer->uid, uid, loop->uid, wrap_json_get_error_string(error),json_object_get_string(devicesJ));
goto OnErrorExit;
}
}
switch (json_object_get_type(subdevsJ)) {
case json_type_object:
loop->scount = 1;
loop->subdevs = calloc(2, sizeof (void*));
loop->subdevs[0] = ProcessOneSubdev(mixer, loop, subdevsJ);
if (!loop->subdevs[0]) goto OnErrorExit;
break;
case json_type_array:
loop->scount = (int) json_object_array_length(subdevsJ);
loop->subdevs = calloc(loop->scount + 1, sizeof (void*));
for (int idx = 0; idx < loop->scount; idx++) {
json_object *subdevJ = json_object_array_get_idx(subdevsJ, idx);
loop->subdevs[idx] = ProcessOneSubdev(mixer, loop, subdevJ);
if (!loop->subdevs[idx]) goto OnErrorExit;
}
break;
default:
AFB_ApiError(mixer->api, "AttachOneLoop mixer=%s hal=%s Loop=%s invalid subdevs= %s", mixer->uid, uid, loop->uid, json_object_get_string(subdevsJ));
goto OnErrorExit;
}
// we may have to register up to 3 control per subdevice (vol, pause, actif)
loop->sndcard->registry = calloc(loop->scount * SMIXER_SUBDS_CTLS + 1, sizeof (RegistryEntryPcmT));
loop->sndcard->rcount = loop->scount*SMIXER_SUBDS_CTLS;
return loop;
OnErrorExit:
return NULL;
}
PUBLIC int ApiLoopAttach(SoftMixerT *mixer, AFB_ReqT request, const char *uid, json_object * argsJ) {
int index;
for (index = 0; index < mixer->max.loops; index++) {
if (!mixer->loops[index]) break;
}
if (index == mixer->max.loops) {
AFB_IfReqFailF(mixer, request, "too-small", "mixer=%s hal=%s max loop=%d", mixer->uid, uid, mixer->max.loops);
goto OnErrorExit;
}
switch (json_object_get_type(argsJ)) {
size_t count;
case json_type_object:
mixer->loops[index] = AttachOneLoop(mixer, uid, argsJ);
if (!mixer->loops[index]) {
goto OnErrorExit;
}
break;
case json_type_array:
count = json_object_array_length(argsJ);
if (count > (mixer->max.loops - index)) {
AFB_IfReqFailF(mixer, request, "too-small", "mixer=%s hal=%s max loop=%d", mixer->uid, uid, mixer->max.loops);
goto OnErrorExit;
}
for (int idx = 0; idx < count; idx++) {
json_object *loopJ = json_object_array_get_idx(argsJ, idx);
mixer->loops[index + idx] = AttachOneLoop(mixer, uid, loopJ);
if (!mixer->loops[index + idx]) {
goto OnErrorExit;
}
}
break;
default:
AFB_IfReqFailF(mixer, request, "invalid-syntax", "mixer=%s hal=%s loops invalid argsJ= %s", mixer->uid, uid, json_object_get_string(argsJ));
goto OnErrorExit;
}
return 0;
OnErrorExit:
return -1;
}
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