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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;
int cardidx;
int ccount;
int port;
} ChannelCardPortT;
STATIC int CardChannelByUid(SoftMixerT *mixer, const char *uid, ChannelCardPortT *response) {
bool found = false;
// search for channel within all sound card sink (channel port target is computed by order)
for (int idx = 0; mixer->sinks[idx]; idx++) {
int jdx;
AlsaSndPcmT * pcm = mixer->sinks[idx];
AlsaPcmChannelT **channels = pcm->channels;
if (!channels) {
AFB_ApiError(mixer->api,
"%s: No Sink card=%s [should declare channels]",
__func__, pcm->uid);
goto OnErrorExit;
}
for (jdx = 0; jdx < pcm->ccount; jdx++) {
if (!strcasecmp(channels[jdx]->uid, uid)) {
response->port = channels[jdx]->port;
response->uid = pcm->uid;
response->ccount = pcm->ccount;
response->cardid = pcm->sndcard->cid.cardid;
response->cardidx = pcm->sndcard->cid.cardidx;
found = true;
break;
}
}
}
if (!found) {
AFB_ApiError(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 scount=0, error = 0;
ChannelCardPortT slave, channel;
AlsaPcmCtlT *pcmRoute = calloc(1, sizeof (AlsaPcmCtlT));
char *cardid = NULL;
char *dmixUid = NULL;
if (!mixer->sinks) {
AFB_ApiError(mixer->api, "AlsaCreateRoute: mixer=%s zone(%s)(zone) No sink found [should Registry sound card first]", mixer->uid, zone->uid);
goto OnErrorExit;
}
if (asprintf(&cardid, "route-%s", zone->uid) == -1)
goto OnErrorExit;
pcmRoute->cid.cardid = (const char *) cardid;
pcmRoute->params = ApiSinkGetParamsByZone(mixer, zone->uid);
zone->params=pcmRoute->params;
// use 1st zone channel to retrieve sound card name + channel count.
error = CardChannelByUid(mixer, zone->sinks[0]->uid, &slave);
if (error) {
AFB_ApiError(mixer->api, "AlsaCreateRoute:zone(%s) fail to find channel=%s", zone->uid, zone->sinks[0]->uid);
goto OnErrorExit;
}
// move from hardware to DMIX attach to sndcard
if (asprintf(&dmixUid, "dmix-%s", slave.uid) == -1)
goto OnErrorExit;
// temporary store to unable multiple channel to route to the same port
snd_config_t **cports = alloca(slave.ccount * sizeof (void*));
memset(cports, 0, slave.ccount * sizeof (void*));
int zcount = 0;
// We create 1st ttable to retrieve sndcard slave and channel count
(void)snd_config_make_compound(&tableConfig, "ttable", 0);
for (scount = 0; zone->sinks[scount] != NULL; scount++) {
error = CardChannelByUid(mixer, zone->sinks[scount]->uid, &channel);
if (error) {
AFB_ApiError(mixer->api, "AlsaCreateRoute:zone(%s) fail to find channel=%s", zone->uid, zone->sinks[scount]->uid);
goto OnErrorExit;
}
if (slave.cardidx != channel.cardidx) {
AFB_ApiError(mixer->api, "AlsaCreateRoute:zone(%s) cannot span over multiple sound card %s != %s ", zone->uid, slave.cardid, channel.cardid);
goto OnErrorExit;
}
int port = zone->sinks[scount]->port;
int target = channel.port;
double volume = 1.0; // currently only support 100%
// if channel entry does not exit into ttable create it now
if (!cports[port]) {
zcount++;
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);
error += snd_config_add(tableConfig, cports[port]);
}
// 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[port], elemConfig);
if (error) goto OnErrorExit;
}
if (error) goto OnErrorExit;
// 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 OnErrorExit;
error += snd_config_set_id(routeConfig, cardid);
if (error) goto OnErrorExit;
error += snd_config_imake_string(&elemConfig, "type", "route");
if (error) goto OnErrorExit;
error += snd_config_add(routeConfig, elemConfig);
if (error) goto OnErrorExit;
error += snd_config_make_compound(&slaveConfig, "slave", 0);
if (error) goto OnErrorExit;
error += snd_config_imake_string(&elemConfig, "pcm", dmixUid);
if (error) goto OnErrorExit;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto OnErrorExit;
error += snd_config_imake_integer(&elemConfig, "channels", slave.ccount);
if (error) goto OnErrorExit;
error += snd_config_add(slaveConfig, elemConfig);
if (error) goto OnErrorExit;
error += snd_config_add(routeConfig, slaveConfig);
if (error) goto OnErrorExit;
error += snd_config_add(routeConfig, tableConfig);
if (error) goto OnErrorExit;
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_ApiError(mixer->api,
"%s: zone(%s) fail to create Plug=%s error=%s",
__func__, zone->uid, pcmRoute->cid.cardid, snd_strerror(error));
goto OnErrorExit;
}
snd_config_update();
error += snd_config_search(snd_config, "pcm", &pcmConfig);
error += snd_config_add(pcmConfig, routeConfig);
if (error) {
AFB_ApiError(mixer->api,
"%s: %s fail to add config route=%s error=%s",
__func__, zone->uid, pcmRoute->cid.cardid, snd_strerror(error));
goto OnErrorExit;
}
// Debug config & pcm
AFB_ApiNotice(mixer->api, "%s: zone(%s) DONE", __func__, zone->uid);
AlsaDumpCtlConfig(mixer, "plug-route", routeConfig, 1);
return pcmRoute;
OnErrorExit:
free(pcmRoute);
free(cardid);
free(dmixUid);
AlsaDumpCtlConfig(mixer, "plug-pcm", snd_config, 1);
AlsaDumpCtlConfig(mixer, "plug-route", routeConfig, 1);
AFB_ApiNotice(mixer->api, "%s: zone(%s) FAIL", __func__, zone->uid);
return NULL;
}
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