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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 <stdbool.h>
ALSA_PLUG_PROTO(route);
typedef struct {
const char *uid;
const char *cardid;
const char * pcmplug_params;
int cardidx;
int ccount;
int port;
bool isPcmPlug;
} ChannelCardPortT;
STATIC int CardChannelByUid(SoftMixerT *mixer, const char *uid, ChannelCardPortT *response) {
AlsaSndPcmT * pcm = NULL;
bool found = false;
// search for channel within all sound card sink (channel port target is computed by order)
cds_list_for_each_entry(pcm, &mixer->sinks.list, list) {
if (pcm->nbChannels == 0) {
AFB_API_ERROR(mixer->api,
"%s: No Sink card=%s [should declare channels]",
__func__, pcm->uid);
goto OnErrorExit;
}
AlsaPcmChannelT * channel = NULL;
cds_list_for_each_entry(channel, &pcm->channels.list, list) {
if (channel->uid && !strcasecmp(channel->uid, uid)) {
response->port = channel->port;
response->uid = pcm->uid;
response->ccount = pcm->nbChannels;
response->cardid = pcm->sndcard->cid.cardid;
response->cardidx = pcm->sndcard->cid.cardidx;
response->pcmplug_params = pcm->sndcard->cid.pcmplug_params;
response->isPcmPlug= pcm->isPcmPlug;
found = true;
break;
}
}
}
if (!found) {
AFB_API_ERROR(mixer->api,
"%s: No Channel with uid=%s [should declare channels]",
__func__, uid);
goto OnErrorExit;
}
return 0;
OnErrorExit:
return -1;
}
PUBLIC AlsaPcmCtlT* AlsaCreateRoute(SoftMixerT *mixer, AlsaSndZoneT *zone, int open) {
snd_config_t *routeConfig, *elemConfig, *slaveConfig, *tableConfig, *pcmConfig;
int error = 0;
ChannelCardPortT slave, channelCardPort;
AlsaPcmCtlT *pcmRoute = NULL;
char *cardid = NULL;
char *slaveUid = NULL;
AFB_API_DEBUG(mixer->api, "%s (zone %s)", __func__, zone->uid);
if (mixer->nbSinks == 0) {
AFB_API_ERROR(mixer->api, "%s: mixer=%s zone(%s)(zone) No sink found [should Registry sound card first]", __func__, mixer->uid, zone->uid);
goto fail;
}
if (asprintf(&cardid, "route-%s", zone->uid) == -1) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
pcmRoute = AlsaPcmCtlNew(mixer, cardid);
if (!pcmRoute) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
pcmRoute->cid.cardid = (const char *) cardid;
pcmRoute->params = ApiSinkGetParamsByZone(mixer, zone->uid);
if (pcmRoute->params == NULL) {
AFB_API_ERROR(mixer->api, "%s: Failed to retrieve zone parameters", __func__);
goto fail_nodump;
}
pcmRoute->params = ApiPcmParamsDup(mixer, pcmRoute->params);
if (!pcmRoute->params) {
SOFTMIXER_NOMEM(mixer->api);
goto fail_nodump;
}
zone->params = ApiPcmParamsDup(mixer, pcmRoute->params);
if (!zone->params) {
SOFTMIXER_NOMEM(mixer->api);
goto fail_nodump;
}
// use 1st zone channel to retrieve sound card name + channel count.
AlsaPcmChannelT * channel = cds_list_first_entry(&zone->sinks.list, AlsaPcmChannelT, list);
error = CardChannelByUid(mixer, channel->uid, &slave);
if (error) {
AFB_API_ERROR(mixer->api, "%s:zone(%s) fail to find channel=%s", __func__, zone->uid, channel->uid);
goto fail;
}
// DMIX only supports real hardware as a slave
if (!slave.isPcmPlug) {
// move from hardware to DMIX attach to sndcard
if (asprintf(&slaveUid, "dmix-%s", slave.uid) == -1) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
} else {
slaveUid = strdup(slave.pcmplug_params);
if (!slaveUid) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
pcmRoute->isPcmPlug = true;
}
// temporary store to enable multiple channel to route to the same port
snd_config_t **cports = alloca(zone->nbSinks * sizeof (void*));
memset(cports, 0, zone->nbSinks * sizeof (void*));
int zcount = 0;
// We create 1st ttable to retrieve sndcard slave and channel count
(void)snd_config_make_compound(&tableConfig, "ttable", 0);
cds_list_for_each_entry(channel, &zone->sinks.list, list) {
AFB_API_DEBUG(mixer->api, "%s: zone->sink channel %s ", __func__, channel->uid);
error = CardChannelByUid(mixer, channel->uid, &channelCardPort);
if (error) {
AFB_API_ERROR(mixer->api, "%s: zone(%s) fail to find channel=%s", __func__, zone->uid, channel->uid);
goto fail;
}
if (slave.cardidx != channelCardPort.cardidx) {
AFB_API_ERROR(mixer->api,
"%s: zone(%s) cannot span over multiple sound card %s != %s ",
__func__, zone->uid, slave.cardid, channelCardPort.cardid);
goto fail;
}
int target = channelCardPort.port;
int port = channel->port;
double volume = 1.0; // currently only support 100%
// if channel entry does not exist into ttable create it now
if (!cports[port]) {
char channelS[4]; // 999 channel should be more than enough
snprintf(channelS, sizeof (channelS), "%d", port);
error = snd_config_make_compound(&cports[port], channelS, 0);
if (error) {
AFB_API_ERROR(mixer->api, "%s: make_compound failed , err %s", __func__, snd_strerror(error));
goto fail;
}
error = snd_config_add(tableConfig, cports[port]);
if (error) {
AFB_API_ERROR(mixer->api, "%s: add compound to table failed, err %s", __func__, snd_strerror(error));
goto fail;
}
}
zcount++;
// ttable require target port as a table and volume as a value
char targetS[4];
snprintf(targetS, sizeof (targetS), "%d", target);
if (channel->volume != -1)
volume = channel->volume;
else
volume = 1.0;
error = snd_config_imake_real(&elemConfig, targetS, volume);
if (error) {
AFB_API_ERROR(mixer->api, "%s: Failed to interpret volume real value, err %s", __func__, snd_strerror(error));
goto fail;
}
error = snd_config_add(cports[port], elemConfig);
if (error) {
AFB_API_ERROR(mixer->api, "%s Failed to add ttable entry:err=%s", __func__, snd_strerror(error));
goto fail;
}
}
// update zone with route channel count and sndcard params
pcmRoute->ccount = zcount;
zone->ccount=zcount;
// refresh global alsalib config and create PCM top config
snd_config_update();
error += snd_config_top(&routeConfig);
if (error) goto fail;
error += snd_config_set_id(routeConfig, cardid);
if (error) goto fail;
error += snd_config_imake_string(&elemConfig, "type", "route");
if (error) goto fail;
error += snd_config_add(routeConfig, elemConfig);
if (error) goto fail;
error += snd_config_make_compound(&slaveConfig, "slave", 0);
if (error) goto fail;
error += snd_config_imake_string(&elemConfig, "pcm", slaveUid);
if (error) goto fail;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto fail;
error += snd_config_imake_integer(&elemConfig, "channels", slave.ccount);
if (error) goto fail;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto fail;
error += snd_config_add(routeConfig, slaveConfig);
if (error) goto fail;
error += snd_config_add(routeConfig, tableConfig);
if (error) goto fail;
if (open) error = _snd_pcm_route_open(&pcmRoute->handle, pcmRoute->cid.cardid, snd_config, routeConfig, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
if (error) {
AFB_API_ERROR(mixer->api,
"%s: zone(%s) fail to create Plug=%s error=%s",
__func__, zone->uid, pcmRoute->cid.cardid, snd_strerror(error));
goto fail;
}
snd_config_update();
error += snd_config_search(snd_config, "pcm", &pcmConfig);
error += snd_config_add(pcmConfig, routeConfig);
if (error) {
AFB_API_ERROR(mixer->api,
"%s: %s fail to add config route=%s error=%s",
__func__, zone->uid, pcmRoute->cid.cardid, snd_strerror(error));
goto fail;
}
zone->routeConfig = routeConfig;
// Debug config & pcm
AFB_API_NOTICE(mixer->api, "%s: zone(%s) DONE", __func__, zone->uid);
AlsaDumpCtlConfig(mixer, "plug-route", routeConfig, 1);
return pcmRoute;
fail:
// AFB_API_ERROR(mixer->api, "%s ERROR, DUMPING PCM...", __func__);
// AlsaDumpCtlConfig(mixer, "plug-pcm", snd_config, 1);
AFB_API_ERROR(mixer->api, "%s ERROR, DUMPING ROUTE...", __func__);
AlsaDumpCtlConfig(mixer, "plug-route", routeConfig, 1);
fail_nodump:
free(pcmRoute);
free(cardid);
free(slaveUid);
AFB_API_NOTICE(mixer->api, "%s: zone(%s) FAIL", __func__, zone->uid);
return NULL;
}
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