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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"
static int uniqueIpcIndex = 1024;
ALSA_PLUG_PROTO(dmix);
PUBLIC AlsaPcmCtlT* AlsaCreateDmix(SoftMixerT *mixer, const char* pcmName, AlsaSndPcmT *pcmSlave, int open) {
snd_config_t *dmixConfig = NULL, *slaveConfig = NULL, *elemConfig = NULL, *pcmConfig=NULL;
AlsaPcmCtlT *pcmPlug= calloc(1,sizeof(AlsaPcmCtlT));
AlsaSndCtlT *sndSlave=pcmSlave->sndcard;
pcmPlug->cid.cardid=pcmName;
char * fullPcmName = NULL;
int error=0;
AFB_ApiInfo(mixer->api, "%s: %s, slave %s, cardid %s (dev %d, subdev %d)\n",
__func__,
pcmName,
pcmSlave->uid,
sndSlave->cid.cardid,
sndSlave->cid.device,
sndSlave->cid.subdev
);
error = asprintf(&fullPcmName,"%s,%d,%d", sndSlave->cid.cardid, sndSlave->cid.device, sndSlave->cid.subdev);
if (error == -1) {
AFB_ApiError(mixer->api,
"%s: Insufficient memory",
__func__);
goto OnErrorExit;
}
error = snd_config_top(&dmixConfig);
if (error) goto OnErrorExit;
error += snd_config_set_id (dmixConfig, pcmName);
if (error) goto OnErrorExit;
error += snd_config_imake_string(&elemConfig, "type", "dmix");
if (error) goto OnErrorExit;
error += snd_config_add(dmixConfig, elemConfig);
if (error) goto OnErrorExit;
error += snd_config_imake_integer(&elemConfig, "ipc_key", uniqueIpcIndex++);
if (error) goto OnErrorExit;
error += snd_config_add(dmixConfig, elemConfig);
if (error) goto OnErrorExit;
error += snd_config_make_compound(&slaveConfig, "slave", 0);
if (error) goto OnErrorExit;
error += snd_config_imake_string(&elemConfig, "pcm", fullPcmName);
if (error) goto OnErrorExit;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto OnErrorExit;
if (sndSlave->params->rate) {
error += snd_config_imake_integer(&elemConfig, "rate", sndSlave->params->rate);
if (error) goto OnErrorExit;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto OnErrorExit;
}
if (sndSlave->params->format) {
error += snd_config_imake_string(&elemConfig, "format", sndSlave->params->formatS);
if (error) goto OnErrorExit;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto OnErrorExit;
}
/* It is critical to set the right number of channels ... know.
* Trying to set another value later leads to silent failure
* */
error += snd_config_imake_integer(&elemConfig, "channels", pcmSlave->ccount);
if (error) goto OnErrorExit;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto OnErrorExit;
// add slave leaf into config
error += snd_config_add(dmixConfig, slaveConfig);
if (error) goto OnErrorExit;
if (open) error = _snd_pcm_dmix_open(&pcmPlug->handle, pcmPlug->cid.cardid, snd_config, dmixConfig, SND_PCM_STREAM_PLAYBACK , SND_PCM_NONBLOCK);
if (error) {
AFB_ApiError(mixer->api,
"%s: fail to create Dmix=%s Slave=%s Error=%s",
__func__, sndSlave->cid.cardid, sndSlave->cid.cardid, snd_strerror(error));
goto OnErrorExit;
}
snd_config_update();
error += snd_config_search(snd_config, "pcm", &pcmConfig);
error += snd_config_add(pcmConfig, dmixConfig);
if (error) {
AFB_ApiError(mixer->api, "%s: fail to add configDMIX=%s", __func__, pcmPlug->cid.cardid);
goto OnErrorExit;
}
// Debug config & pcm
AlsaDumpCtlConfig(mixer, "plug-dmix", dmixConfig, 1);
AFB_ApiNotice(mixer->api, "%s: %s done", __func__, pcmPlug->cid.cardid);
return pcmPlug;
OnErrorExit:
free(fullPcmName);
AlsaDumpCtlConfig(mixer, "plug-pcm", pcmConfig, 1);
AlsaDumpCtlConfig(mixer, "plug-dmix", dmixConfig, 1);
AFB_ApiNotice(mixer->api, "%s: FAIL", __func__);
return NULL;
}
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