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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"
ALSA_PLUG_PROTO(multi);
PUBLIC AlsaPcmInfoT* AlsaCreateMulti(CtlSourceT *source, const char *pcmUid, int open) {
SoftMixerHandleT *mixerHandle = (SoftMixerHandleT*) source->context;
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;
assert(mixerHandle);
AlsaPcmInfoT* pcmSlaves=mixerHandle->backend;
if (!pcmSlaves) {
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->uid);
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();
if (open) 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);
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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