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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 softvol plugin
static void softVolConfigClean(SoftMixerT *mixer, void * arg) {
snd_config_t * softvolConfig = arg;
AFB_API_DEBUG(mixer->api, "%s... softvol config", __func__);
snd_config_delete(softvolConfig);
snd_config_update();
}
PUBLIC AlsaPcmCtlT *AlsaCreateSoftvol(SoftMixerT *mixer, AlsaStreamAudioT *stream, char* slaveid, AlsaSndCtlT *sndcard, char* ctlName, int max, int open) {
snd_config_t *streamConfig, *elemConfig, *slaveConfig, *controlConfig,*pcmConfig;
char *cardid = NULL;
int error = 0;
AlsaPcmCtlT *pcmVol = NULL;
AFB_API_DEBUG(mixer->api, "%s create SOFTVOL on %s (nb channels=%d)", __func__, slaveid, stream->params->channels);
if (asprintf(&cardid, "softvol-%s", stream->uid) == -1) {
SOFTMIXER_NOMEM(mixer->api);
goto OnErrorExit;
}
pcmVol = AlsaPcmCtlNew(mixer, cardid);
if (pcmVol == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto OnErrorExit;
}
pcmVol->cid.cardid = (const char *) cardid;
// refresh global alsalib config and create PCM top config
snd_config_update();
error += snd_config_top(&streamConfig);
error += snd_config_set_id (streamConfig, pcmVol->cid.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", slaveid);
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", sndcard->cid.cardidx);
error += snd_config_add(controlConfig, elemConfig);
error += snd_config_imake_integer(&elemConfig, "count", stream->params->channels);
error += snd_config_add(controlConfig, elemConfig);
error += snd_config_add(streamConfig, controlConfig);
if (error) goto OnErrorExit;
if (open) error = _snd_pcm_softvol_open(&pcmVol->handle, stream->uid, snd_config, streamConfig, SND_PCM_STREAM_PLAYBACK , SND_PCM_NONBLOCK);
if (error) {
AFB_API_ERROR(mixer->api,
"%s: %s(stream) fail to create Plug=%s Slave=%s error=%s",
__func__, stream->uid, pcmVol->cid.cardid, sndcard->cid.cardid, snd_strerror(error));
goto OnErrorExit;
}
// update top config to access previous plugin PCM
snd_config_update();
error += snd_config_search(snd_config, "pcm", &pcmConfig);
error += snd_config_add(pcmConfig, streamConfig);
if (error) {
AFB_API_ERROR(mixer->api,
"%s: %s(stream) fail to add config error=%s",
__func__, stream->uid, snd_strerror(error));
goto OnErrorExit;
}
pcmVol->private_data = streamConfig;
pcmVol->private_data_clean = softVolConfigClean;
// Debug config & pcm
//AlsaDumpCtlConfig (mixer, "plug-config", pcmConfig, 1);
AlsaDumpCtlConfig(mixer, "plug-softvol", streamConfig, 1);
AFB_API_NOTICE(mixer->api, "%s: %s(stream) done", __func__, stream->uid);
return pcmVol;
OnErrorExit:
free(cardid);
//AlsaDumpCtlConfig (mixer, "plug-config", pcmConfig, 1);
AlsaDumpCtlConfig(mixer, "plug-softvol", streamConfig, 1);
AFB_API_NOTICE(mixer->api, "AlsaCreateSoftvol:%s(stream) OnErrorExit", stream->uid);
return NULL;
}
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