diff options
Diffstat (limited to 'plugins/alsa/alsa-plug-vol.c')
| -rw-r--r-- | plugins/alsa/alsa-plug-vol.c | 82 |
1 files changed, 82 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..42d1e0b --- /dev/null +++ b/plugins/alsa/alsa-plug-vol.c @@ -0,0 +1,82 @@ +/* + * 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); + +PUBLIC AlsaPcmInfoT* AlsaCreateVol(CtlSourceT *source, const char *pcmName, AlsaPcmInfoT* ctlTarget, AlsaPcmInfoT* pcmSlave) { + + snd_config_t *volConfig, *elemConfig, *slaveConfig, *controlConfig,*pcmConfig; + int error = 0; + AlsaPcmInfoT *pcmPlug= malloc(sizeof(AlsaPcmInfoT)); + pcmPlug->devid= pcmName; + + // refresh global alsalib config and create PCM top config + snd_config_update(); + error += snd_config_top(&volConfig); + error += snd_config_set_id (volConfig, pcmPlug->devid); + error += snd_config_imake_string(&elemConfig, "type", "softvol"); + error += snd_config_add(volConfig, elemConfig); + if (error) goto OnErrorExit; + + // add slave leaf + error += snd_config_make_compound(&slaveConfig, "slave", 0); + error += snd_config_imake_string(&elemConfig, "pcm", pcmSlave->devid); + error += snd_config_add(slaveConfig, elemConfig); + error += snd_config_add(volConfig, slaveConfig); + if (error) goto OnErrorExit; + + // add control leaf + error += snd_config_make_compound(&controlConfig, "control", 0); + error += snd_config_imake_string(&elemConfig, "name", pcmName); + error += snd_config_add(controlConfig, elemConfig); + error += snd_config_imake_integer(&elemConfig, "card", ctlTarget->cardid); + error += snd_config_add(controlConfig, elemConfig); + error += snd_config_add(volConfig, controlConfig); + if (error) goto OnErrorExit; + + // update top config to access previous plugin PCM + snd_config_update(); + + error = _snd_pcm_softvol_open(&pcmPlug->handle, pcmName, snd_config, volConfig, SND_PCM_STREAM_PLAYBACK , SND_PCM_NONBLOCK); + if (error) { + AFB_ApiError(source->api, "AlsaCreateVol: fail to create Plug=%s Slave=%s", pcmPlug->devid, pcmSlave->devid); + goto OnErrorExit; + } + + error += snd_config_search(snd_config, "pcm", &pcmConfig); + error += snd_config_add(pcmConfig, volConfig); + if (!error) { + AFB_ApiError(source->api, "AlsaCreateDmix: fail to add configDMIX=%s", pcmPlug->devid); + goto OnErrorExit; + } + + // Debug config & pcm + AlsaDumpCtlConfig (source, volConfig, 1); + //AlsaDumpPcmInfo(source, pcmPlug->handle, "pcmPlug->handle"); + AFB_ApiNotice(source->api, "AlsaCreateVol: %s done", pcmPlug->devid); + return pcmPlug; + +OnErrorExit: + AFB_ApiNotice(source->api, "AlsaCreateVol: OnErrorExit"); + AlsaDumpCtlConfig(source, volConfig, 1); + return NULL; +}
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