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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(SoftMixerT *mixer, 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(mixer->api, "AlsaCardInfoByPath: fail to find sndcard by path= %s", devpath);
return NULL;
}
PUBLIC AlsaPcmCtlT *AlsaByPathOpenPcm(SoftMixerT *mixer, AlsaDevInfoT *pcmDev, snd_pcm_stream_t direction) {
int error;
AlsaPcmCtlT *pcmCtl = calloc(1, sizeof (AlsaPcmCtlT));
if (!pcmDev->cardid) {
char *cardid;
if (pcmDev->subdev) (void)asprintf(&cardid, "hw:%i,%i,%i", pcmDev->cardidx, pcmDev->device, pcmDev->subdev);
else if (pcmDev->device) (void) asprintf(&cardid, "hw:%i,%i", pcmDev->cardidx, pcmDev->device);
else (void) asprintf(&cardid, "hw:%i", pcmDev->cardidx);
pcmDev->cardid= (const char*)cardid;
}
// inherit CID fropm pcmDev
pcmCtl->cid.cardid = pcmDev->cardid;
pcmCtl->cid.cardidx = pcmDev->cardidx;
pcmCtl->cid.device = pcmDev->device;
pcmCtl->cid.subdev = pcmDev->subdev;
pcmCtl->cid.name=NULL;
pcmCtl->cid.longname=NULL;
error = snd_pcm_open(&pcmCtl->handle, pcmCtl->cid.cardid, direction, SND_PCM_NONBLOCK);
if (error) {
AFB_ApiError(mixer->api, "AlsaByPathOpenPcm: fail openpcm cardid=%s error=%s", pcmCtl->cid.cardid, snd_strerror(error));
goto OnErrorExit;
}
return pcmCtl;
OnErrorExit:
free(pcmCtl);
return NULL;
}
PUBLIC snd_ctl_t *AlsaByPathOpenCtl(SoftMixerT *mixer, const char *uid, AlsaSndCtlT *dev) {
int err;
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->cid.devpath)
cardInfo = AlsaByPathInfo(mixer, dev->cid.devpath);
else if (dev->cid.cardid)
cardInfo = AlsaCtlGetInfo(mixer, dev->cid.cardid);
if (!cardInfo) {
AFB_ApiError(mixer->api, "AlsaByPathOpenCtl: uid=%s fail to find sndcard by path=%s id=%s", uid, dev->cid.devpath, dev->cid.cardid);
goto OnErrorExit;
}
// extract useful info from cardInfo handle
dev->cid.devpath = NULL;
dev->cid.cardidx = snd_ctl_card_info_get_card(cardInfo);
dev->cid.name = strdup(snd_ctl_card_info_get_name(cardInfo));
dev->cid.longname = strdup(snd_ctl_card_info_get_longname(cardInfo));
// build a valid name and open sndcard
(void) asprintf((char**) &dev->cid.cardid, "hw:%i", dev->cid.cardidx);
if ((err = snd_ctl_open(&handle, dev->cid.cardid, 0)) < 0) {
AFB_ApiError(mixer->api, "AlsaByPathOpenCtl uid=%s sndcard open fail cardid=%s longname=%s error=%s", uid, dev->cid.cardid, dev->cid.longname, snd_strerror(err));
goto OnErrorExit;
}
AFB_ApiNotice(mixer->api, "AlsaCtlOpenByPath: uid=%s cardid=%s cardname=%s", uid, dev->cid.cardid, dev->cid.longname);
free(cardInfo);
return handle;
OnErrorExit:
return NULL;
}
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