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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(route);
STATIC int CardChannelByUid(CtlSourceT *source, AlsaPcmInfoT *pcmBackend, const char *uid) {
int channelIdx = -1;
// search for channel within all sound card backend (channel port target is computed by order)
int targetIdx=0;
for (int cardIdx = 0; pcmBackend[cardIdx].uid != NULL; cardIdx++) {
AlsaPcmChannels *channels = pcmBackend[cardIdx].channels;
if (!channels) {
AFB_ApiError(source->api, "CardChannelByUid: No Backend card=%s [should declare channels]", pcmBackend[cardIdx].uid);
goto OnErrorExit;
}
for (int idx = 0; channels[idx].uid != NULL; idx++) {
if (!strcmp(channels[idx].uid, uid)) return targetIdx;
targetIdx++;
}
}
// this is OnErrorExit
return channelIdx;
OnErrorExit:
return -1;
}
PUBLIC AlsaPcmInfoT* AlsaCreateRoute(CtlSourceT *source, AlsaSndZoneT *zone) {
snd_config_t *routeConfig, *elemConfig, *slaveConfig, *tableConfig, *pcmConfig;
int error = 0;
AlsaPcmInfoT *pcmPlug = calloc(1, sizeof (AlsaPcmInfoT));
pcmPlug->uid = zone->uid;
pcmPlug->cardid = zone->uid;
AlsaPcmInfoT *pcmBackend = Softmixer->sndcardCtl;
AlsaPcmInfoT* pcmSlave=Softmixer->multiPcm;
if (!pcmBackend || !pcmSlave) {
AFB_ApiError(source->api, "AlsaCreateRoute:zone(%s)(zone) No Sound Card Ctl find [should register snd_cards first]", zone->uid);
goto OnErrorExit;
}
// refresh global alsalib config and create PCM top config
snd_config_update();
error += snd_config_top(&routeConfig);
error += snd_config_set_id(routeConfig, pcmPlug->cardid);
error += snd_config_imake_string(&elemConfig, "type", "route");
error += snd_config_add(routeConfig, elemConfig);
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_imake_integer(&elemConfig, "channels", pcmSlave->ccount);
error += snd_config_add(slaveConfig, elemConfig);
error += snd_config_add(routeConfig, slaveConfig);
error += snd_config_make_compound(&tableConfig, "ttable", 0);
error += snd_config_add(routeConfig, tableConfig);
if (error) goto OnErrorExit;
// tempry store to unable multiple channel to route to the same port
snd_config_t **cports;
cports = alloca(sizeof (snd_config_t*)*(pcmSlave->ccount + 1));
memset(cports, 0, (sizeof (snd_config_t*)*(pcmSlave->ccount + 1)));
// loop on sound card to include into multi
for (int idx = 0; zone->channels[idx].uid != NULL; idx++) {
int target = CardChannelByUid(source, pcmBackend, zone->channels[idx].uid);
if (target < 0) {
AFB_ApiError(source->api, "AlsaCreateRoute:zone(%s) fail to find channel=%s", zone->uid, zone->channels[idx].uid);
goto OnErrorExit;
}
int channel = zone->channels[idx].port;
double volume = 1.0; // currently only support 100%
// if channel entry does not exit into ttable create it now
if (!cports[channel]) {
pcmPlug->ccount++;
char channelS[4]; // 999 channel should be more than enough
snprintf(channelS, sizeof (channelS), "%d", channel);
error += snd_config_make_compound(&cports[channel], channelS, 0);
error += snd_config_add(tableConfig, cports[channel]);
}
// ttable require target port as a table and volume as a value
char targetS[4];
snprintf(targetS, sizeof (targetS), "%d", target);
error += snd_config_imake_real(&elemConfig, targetS, volume);
error += snd_config_add(cports[channel], elemConfig);
if (error) goto OnErrorExit;
}
// update top config to access previous plugin PCM
snd_config_update();
error = _snd_pcm_route_open(&pcmPlug->handle, zone->uid, snd_config, routeConfig, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
if (error) {
AFB_ApiError(source->api, "AlsaCreateRoute:zone(%s) fail to create Plug=%s error=%s", zone->uid, pcmPlug->cardid, snd_strerror(error));
goto OnErrorExit;
}
error += snd_config_search(snd_config, "pcm", &pcmConfig);
error += snd_config_add(pcmConfig, routeConfig);
if (error) {
AFB_ApiError(source->api, "AlsaCreateDmix:%s fail to add configDMIX=%s", zone->uid, pcmPlug->cardid);
goto OnErrorExit;
}
// Debug config & pcm
AlsaDumpCtlConfig(source, "plug-route", routeConfig, 1);
AFB_ApiNotice(source->api, "AlsaCreateRoute:zone(%s) done\n", zone->uid);
return pcmPlug;
OnErrorExit:
AlsaDumpCtlConfig(source, "plug-route", routeConfig, 1);
AFB_ApiNotice(source->api, "AlsaCreateRoute:zone(%s) OnErrorExit\n", zone->uid);
return NULL;
}
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