diff options
Diffstat (limited to 'plugins/alsa/alsa-plug-multi.c')
| -rw-r--r-- | plugins/alsa/alsa-plug-multi.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-plug-multi.c b/plugins/alsa/alsa-plug-multi.c new file mode 100644 index 0000000..d6ef46e --- /dev/null +++ b/plugins/alsa/alsa-plug-multi.c @@ -0,0 +1,105 @@ +/* + * 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(multi); + +PUBLIC AlsaPcmInfoT* AlsaCreateMulti(CtlSourceT *source, const char *pcmUid) { + + snd_config_t *multiConfig, *elemConfig, *slavesConfig, *slaveConfig, *bindingsConfig, *bindingConfig, *pcmConfig; + int error = 0, channelIdx=0; + AlsaPcmInfoT *pcmPlug = calloc(1, sizeof (AlsaPcmInfoT)); + pcmPlug->uid = pcmUid; + pcmPlug->cardid = pcmUid; + + AlsaPcmInfoT* pcmSlaves=Softmixer->sndcardCtl; + if (!Softmixer->sndcardCtl) { + AFB_ApiError(source->api, "AlsaCreateMulti: No Sound Card find [should register snd_cards first]"); + goto OnErrorExit; + } + + // refresh global alsalib config and create PCM top config + snd_config_update(); + error += snd_config_top(&multiConfig); + error += snd_config_set_id (multiConfig, pcmPlug->cardid); + error += snd_config_imake_string(&elemConfig, "type", "multi"); + error += snd_config_add(multiConfig, elemConfig); + if (error) goto OnErrorExit; + + error += snd_config_make_compound(&slavesConfig, "slaves", 0); + error += snd_config_make_compound(&bindingsConfig, "bindings", 0); + + // loop on sound card to include into multi + for (int idx = 0; pcmSlaves[idx].uid != NULL; idx++) { + AlsaPcmInfoT* sndcard=&pcmSlaves[idx]; + AlsaPcmChannels *channels = sndcard->channels; + + for (channelIdx=0; channels[channelIdx].uid != NULL; channelIdx++) { + char idxS[4]; // 999 channel should be more than enough + snprintf (idxS, sizeof(idxS), "%d", pcmPlug->ccount++); + // multi does not support to name channels + error += snd_config_make_compound(&bindingConfig,idxS, 0); + error += snd_config_imake_string(&elemConfig, "slave", sndcard->cardid); + error += snd_config_add(bindingConfig, elemConfig); + error += snd_config_imake_integer(&elemConfig,"channel", channelIdx); + error += snd_config_add(bindingConfig, elemConfig); + error += snd_config_add(bindingsConfig, bindingConfig); + } + + error += snd_config_make_compound(&slaveConfig, sndcard->uid, 0); + error += snd_config_imake_string(&elemConfig, "pcm", sndcard->cardid); + error += snd_config_add(slaveConfig, elemConfig); + error += snd_config_imake_integer(&elemConfig, "channels", channelIdx); + error += snd_config_add(slaveConfig, elemConfig); + error += snd_config_add(slavesConfig, slaveConfig); + } + + error += snd_config_add(multiConfig, slavesConfig); + error += snd_config_add(multiConfig, bindingsConfig); + if (error) goto OnErrorExit; + + // update top config to access previous plugin PCM + snd_config_update(); + + error = _snd_pcm_multi_open(&pcmPlug->handle, pcmUid, snd_config, multiConfig, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); + if (error) { + AFB_ApiError(source->api, "AlsaCreateMulti: fail to create Plug=%s Error=%s", pcmPlug->cardid, snd_strerror(error)); + goto OnErrorExit; + } + + error += snd_config_search(snd_config, "pcm", &pcmConfig); + error += snd_config_add(pcmConfig, multiConfig); + if (error) { + AFB_ApiError(source->api, "AlsaCreateDmix: fail to add configDMIX=%s", pcmPlug->cardid); + goto OnErrorExit; + } + + // Debug config & pcm + //AlsaDumpCtlConfig(source, "plug-multi", multiConfig, 1); + //AlsaDumpPcmInfo(source, pcmPlug->handle, "pcmPlug->handle"); + AFB_ApiNotice(source->api, "AlsaCreateMulti: %s done\n", pcmPlug->cardid); + return pcmPlug; + +OnErrorExit: + AlsaDumpCtlConfig(source, "plug-multi", multiConfig, 1); + AFB_ApiNotice(source->api, "AlsaCreateMulti: OnErrorExit\n"); + return NULL; +}
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