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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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "alsa-softmixer.h"
// extracted IOCTLs from <alsa/asoundlib.h>
#define _IOR_HACKED(type,nr,size) _IOC(_IOC_READ,(type),(nr),size)
#define SNDRV_CTL_IOCTL_CARD_INFO(size) _IOR_HACKED('U', 0x01, size)
// Clone of AlsaLib snd_card_load2 static function
PUBLIC snd_ctl_card_info_t *AlsaByPathInfo(CtlSourceT *source, const char *devpath) {
int open_dev;
snd_ctl_card_info_t *cardInfo = malloc(snd_ctl_card_info_sizeof());
if (!devpath) goto OnErrorExit;
open_dev = open(devpath, O_RDONLY);
if (open_dev < 0) goto OnErrorExit;
int rc = ioctl(open_dev, SNDRV_CTL_IOCTL_CARD_INFO(snd_ctl_card_info_sizeof()), cardInfo);
if (rc < 0) {
close(open_dev);
goto OnErrorExit;
}
close(open_dev);
return cardInfo;
OnErrorExit:
AFB_ApiError(source->api, "AlsaCardInfoByPath: fail to find sndcard by path= %s", devpath);
return NULL;
}
PUBLIC int AlsaByPathDevid(CtlSourceT *source, AlsaPcmInfoT *dev) {
// get card info from /dev/snd/xxx if not use hw:x,x,x
snd_ctl_card_info_t *cardInfo = NULL;
if (dev->devpath) {
cardInfo = AlsaByPathInfo(source, dev->devpath);
dev->cardid=NULL;
}
else if (dev->cardid) {
dev->cardid= strdup(dev->cardid);
cardInfo = AlsaCtlGetInfo(source, dev->cardid);
}
else {
dev->cardid=malloc(ALSA_CARDID_MAX_LEN);
snprintf((char*)dev->cardid, ALSA_CARDID_MAX_LEN, "hw:%i", dev->cardidx);
cardInfo = AlsaCtlGetInfo(source, dev->cardid);
}
if (!cardInfo) {
AFB_ApiWarning(source->api, "AlsaByPathOpenPcm: fail to find sndcard by path=%s id=%s", dev->devpath, dev->cardid);
goto OnErrorExit;
}
// extract useful info from cardInfo handle
dev->cardidx = snd_ctl_card_info_get_card(cardInfo);
// if not provided build a valid PCM cardid
if (!dev->cardid) {
dev->cardid=malloc(ALSA_CARDID_MAX_LEN);
if (dev->subdev) snprintf((char*)dev->cardid, ALSA_CARDID_MAX_LEN, "hw:%i,%i,%i", dev->cardidx, dev->device, dev->subdev);
else if (dev->device) snprintf((char*)dev->cardid, ALSA_CARDID_MAX_LEN, "hw:%i,%i", dev->cardidx, dev->device);
else snprintf((char*)dev->cardid, ALSA_CARDID_MAX_LEN, "hw:%i", dev->cardidx);
}
// make sure UID will cannot be removed
dev->uid= strdup(dev->uid);
return 0;
OnErrorExit:
return -1;
}
PUBLIC AlsaPcmInfoT* AlsaByPathOpenPcm(CtlSourceT *source, AlsaPcmInfoT *dev, snd_pcm_stream_t direction) {
int error;
// duplicate dev structure to allow caller to free dev
AlsaPcmInfoT* pcm=malloc(sizeof(AlsaPcmInfoT));
memcpy (pcm, dev, sizeof(AlsaPcmInfoT));
error = AlsaByPathDevid(source, pcm);
if (error) goto OnErrorExit;
error = snd_pcm_open(&pcm->handle, pcm->cardid, direction, SND_PCM_NONBLOCK);
if (error) {
AFB_ApiError(source->api, "AlsaByPathOpenPcm: fail openpcm (cardid=%s idxdev=%i subdev=%d): %s"
, pcm->cardid, pcm->device, pcm->subdev, snd_strerror(error));
goto OnErrorExit;
}
return (pcm);
OnErrorExit:
return NULL;
}
PUBLIC snd_ctl_t *AlsaByPathOpenCtl(CtlSourceT *source, AlsaPcmInfoT *dev) {
int err;
char cardid[32];
snd_ctl_t *handle;
// get card info from /dev/snd/xxx if not use hw:x,x,x
snd_ctl_card_info_t *cardInfo = NULL;
if (dev->devpath) cardInfo = AlsaByPathInfo(source, dev->devpath);
else if (dev->cardid) cardInfo = AlsaCtlGetInfo(source, dev->cardid);
if (!cardInfo) {
AFB_ApiError(source->api, "AlsaByPathOpenCtl: fail to find sndcard by path=%s id=%s", dev->devpath, dev->cardid);
goto OnErrorExit;
}
// extract useful info from cardInfo handle
int cardIndex = snd_ctl_card_info_get_card(cardInfo);
const char *cardId = snd_ctl_card_info_get_id(cardInfo);
const char *cardName = snd_ctl_card_info_get_name(cardInfo);
// build a valid name and open sndcard
snprintf(cardid, sizeof (cardid), "hw:%i", cardIndex);
if ((err = snd_ctl_open(&handle, cardid, 0)) < 0) {
AFB_ApiError(source->api, "control open (hw:%d -> %s): %s", cardIndex, cardName, snd_strerror(err));
goto OnErrorExit;
}
AFB_ApiNotice(source->api, "AlsaCtlOpenByPath: sndcard hw:%d id=%s name=%s", cardIndex, cardId, cardName);
free(cardInfo);
return handle;
OnErrorExit:
return NULL;
}
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