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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"
ALSA_PLUG_PROTO(softvol); // stream uses solftvol plugin
STATIC AlsaPcmInfoT* SlaveZoneByUid(CtlSourceT *source, AlsaPcmInfoT **pcmZones, const char *uid) {
AlsaPcmInfoT *slaveZone= NULL;
// Loop on every Registryed zone pcm and extract (cardid) from (uid)
for (int idx = 0; pcmZones[idx] != NULL; idx++) {
if (!strcasecmp (pcmZones[idx]->uid, uid)) {
slaveZone= pcmZones[idx];
return slaveZone;
}
}
return NULL;
}
PUBLIC AlsaPcmInfoT* AlsaCreateSoftvol(CtlSourceT *source, AlsaLoopStreamT *stream, AlsaPcmInfoT *ctlControl, const char* ctlName, int max, int open) {
SoftMixerHandleT *mixerHandle = (SoftMixerHandleT*) source->context;
snd_config_t *streamConfig, *elemConfig, *slaveConfig, *controlConfig,*pcmConfig;
int error = 0;
AlsaPcmInfoT *pcmPlug= calloc(1,sizeof(AlsaPcmInfoT));
assert (mixerHandle);
// assert static/global softmixer handle get requited info
AlsaSndLoopT *ctlLoop = mixerHandle->frontend;
if (!ctlLoop) {
AFB_ApiError(source->api, "AlsaCreateSoftvol:%s(stream) No Loop found [should Registry snd_loop first]",stream->uid);
goto OnErrorExit;
}
// assert static/global softmixer handle get requited info
AlsaPcmInfoT **pcmZones = mixerHandle->routes;
if (!pcmZones) {
AFB_ApiError(source->api, "AlsaCreateSoftvol:%s(stream) No Zone found [should Registry snd_zones first]", stream->uid);
goto OnErrorExit;
}
// search for target zone uid
AlsaPcmInfoT *pcmSlave= SlaveZoneByUid (source, pcmZones, stream->zone);
if (!pcmSlave || !pcmSlave->uid) {
AFB_ApiError(source->api, "AlsaCreateSoftvol:%s(stream) fail to find Zone=%s", stream->uid, stream->zone);
goto OnErrorExit;
}
// stream inherit from zone channel count
pcmPlug->uid= strdup(stream->uid);
pcmPlug->cardid= pcmPlug->uid;
pcmPlug->devpath=NULL;
pcmPlug->ccount= pcmSlave->ccount;
memcpy (&pcmPlug->params, &stream->params, sizeof(AlsaPcmHwInfoT));
pcmPlug->params.channels= pcmSlave->ccount;
// refresh global alsalib config and create PCM top config
snd_config_update();
error += snd_config_top(&streamConfig);
error += snd_config_set_id (streamConfig, pcmPlug->cardid);
error += snd_config_imake_string(&elemConfig, "type", "softvol");
error += snd_config_add(streamConfig, elemConfig);
error += snd_config_imake_integer(&elemConfig, "resolution", max+1);
error += snd_config_add(streamConfig, elemConfig);
if (error) goto OnErrorExit;
// add slave leaf
error += snd_config_make_compound(&slaveConfig, "slave", 0);
error += snd_config_imake_string(&elemConfig, "pcm", pcmSlave->cardid);
error += snd_config_add(slaveConfig, elemConfig);
error += snd_config_add(streamConfig, slaveConfig);
if (error) goto OnErrorExit;
// add control leaf
error += snd_config_make_compound(&controlConfig, "control", 0);
error += snd_config_imake_string(&elemConfig, "name", ctlName);
error += snd_config_add(controlConfig, elemConfig);
error += snd_config_imake_integer(&elemConfig, "card", ctlControl->cardidx);
error += snd_config_add(controlConfig, elemConfig);
error += snd_config_add(streamConfig, controlConfig);
if (error) goto OnErrorExit;
// update top config to access previous plugin PCM
snd_config_update();
if (open) error = _snd_pcm_softvol_open(&pcmPlug->handle, stream->uid, snd_config, streamConfig, SND_PCM_STREAM_PLAYBACK , SND_PCM_NONBLOCK);
if (error) {
AFB_ApiError(source->api, "AlsaCreateSoftvol:%s(stream) fail to create Plug=%s Slave=%s error=%s", stream->uid, pcmPlug->cardid, pcmSlave->cardid, snd_strerror(error));
goto OnErrorExit;
}
error += snd_config_search(snd_config, "pcm", &pcmConfig);
error += snd_config_add(pcmConfig, streamConfig);
if (error) {
AFB_ApiError(source->api, "AlsaCreateSoftvol:%s(stream) fail to add config", stream->uid);
goto OnErrorExit;
}
// Debug config & pcm
//AlsaDumpCtlConfig (source, "plug-stream", streamConfig, 1);
AFB_ApiNotice(source->api, "AlsaCreateSoftvol:%s(stream) done\n", stream->uid);
return pcmPlug;
OnErrorExit:
AlsaDumpCtlConfig(source, "plug-stream", streamConfig, 1);
AFB_ApiNotice(source->api, "AlsaCreateSoftvol:%s(stream) OnErrorExit\n", stream->uid);
return NULL;
}
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