diff options
Diffstat (limited to 'plugins/alsa/alsa-plug-vol.c')
| -rw-r--r-- | plugins/alsa/alsa-plug-vol.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-plug-vol.c b/plugins/alsa/alsa-plug-vol.c new file mode 100644 index 0000000..dc600f9 --- /dev/null +++ b/plugins/alsa/alsa-plug-vol.c @@ -0,0 +1,125 @@ +/* + * 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(softvol); // stream uses solftvol plugin + +STATIC AlsaPcmInfoT* SlaveZoneByUid(CtlSourceT *source, AlsaPcmInfoT **pcmZones, const char *uid) { + AlsaPcmInfoT *slaveZone= NULL; + + // Loop on every registered zone pcm and extract (cardid) from (uid) + for (int idx = 0; pcmZones[idx] != NULL; idx++) { + if (!strcasecmp (pcmZones[idx]->uid, uid)) { + slaveZone= pcmZones[idx]; + return slaveZone; + } + } + + return NULL; +} + +PUBLIC AlsaPcmInfoT* AlsaCreateStream(CtlSourceT *source, AlsaSndStreamT *stream, AlsaPcmInfoT *ctlControl, const char* ctlName, int max, int open) { + + snd_config_t *streamConfig, *elemConfig, *slaveConfig, *controlConfig,*pcmConfig; + int error = 0; + AlsaPcmInfoT *pcmPlug= calloc(1,sizeof(AlsaPcmInfoT)); + + // assert static/global softmixer handle get requited info + AlsaSndLoopT *ctlLoop = Softmixer->loopCtl; + if (!ctlLoop) { + AFB_ApiError(source->api, "AlsaCreateStream:%s(stream) No Loop found [should register snd_loop first]",stream->uid); + goto OnErrorExit; + } + + // assert static/global softmixer handle get requited info + AlsaPcmInfoT **pcmZones = Softmixer->zonePcms; + if (!pcmZones) { + AFB_ApiError(source->api, "AlsaCreateStream:%s(stream) No Zone found [should register snd_zones first]", stream->uid); + goto OnErrorExit; + } + + // search for target zone uid + AlsaPcmInfoT *pcmSlave= SlaveZoneByUid (source, pcmZones, stream->zone); + if (!pcmSlave || !pcmSlave->uid) { + AFB_ApiError(source->api, "AlsaCreateStream:%s(stream) fail to find Zone=%s", stream->uid, stream->zone); + goto OnErrorExit; + } + + // stream inherit from zone channel count + pcmPlug->uid= strdup(stream->uid); + pcmPlug->cardid= pcmPlug->uid; + pcmPlug->devpath=NULL; + pcmPlug->ccount= pcmSlave->ccount; + memcpy (&pcmPlug->params, &stream->params, sizeof(AlsaPcmHwInfoT)); + pcmPlug->params.channels= pcmSlave->ccount; + + // refresh global alsalib config and create PCM top config + snd_config_update(); + error += snd_config_top(&streamConfig); + error += snd_config_set_id (streamConfig, pcmPlug->cardid); + error += snd_config_imake_string(&elemConfig, "type", "softvol"); + error += snd_config_add(streamConfig, elemConfig); + error += snd_config_imake_integer(&elemConfig, "resolution", max+1); + error += snd_config_add(streamConfig, elemConfig); + if (error) goto OnErrorExit; + + // add slave leaf + 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_add(streamConfig, slaveConfig); + if (error) goto OnErrorExit; + + // add control leaf + error += snd_config_make_compound(&controlConfig, "control", 0); + error += snd_config_imake_string(&elemConfig, "name", ctlName); + error += snd_config_add(controlConfig, elemConfig); + error += snd_config_imake_integer(&elemConfig, "card", ctlControl->cardidx); + error += snd_config_add(controlConfig, elemConfig); + error += snd_config_add(streamConfig, controlConfig); + if (error) goto OnErrorExit; + + // update top config to access previous plugin PCM + snd_config_update(); + + if (open) error = _snd_pcm_softvol_open(&pcmPlug->handle, stream->uid, snd_config, streamConfig, SND_PCM_STREAM_PLAYBACK , SND_PCM_NONBLOCK); + if (error) { + AFB_ApiError(source->api, "AlsaCreateStream:%s(stream) fail to create Plug=%s Slave=%s error=%s", stream->uid, pcmPlug->cardid, pcmSlave->cardid, snd_strerror(error)); + goto OnErrorExit; + } + + error += snd_config_search(snd_config, "pcm", &pcmConfig); + error += snd_config_add(pcmConfig, streamConfig); + if (error) { + AFB_ApiError(source->api, "AlsaCreateStream:%s(stream) fail to add config", stream->uid); + goto OnErrorExit; + } + + // Debug config & pcm + //AlsaDumpCtlConfig (source, "plug-stream", streamConfig, 1); + AFB_ApiNotice(source->api, "AlsaCreateStream:%s(stream) done\n", stream->uid); + return pcmPlug; + +OnErrorExit: + AlsaDumpCtlConfig(source, "plug-stream", streamConfig, 1); + AFB_ApiNotice(source->api, "AlsaCreateStream:%s(stream) OnErrorExit\n", stream->uid); + return NULL; +}
\ No newline at end of file |