diff options
Diffstat (limited to 'plugins/alsa/alsa-plug-route.c')
| -rw-r--r-- | plugins/alsa/alsa-plug-route.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-plug-route.c b/plugins/alsa/alsa-plug-route.c new file mode 100644 index 0000000..dc75b56 --- /dev/null +++ b/plugins/alsa/alsa-plug-route.c @@ -0,0 +1,140 @@ +/* + * 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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