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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 = (snd_ctl_card_info_t *) malloc(snd_ctl_card_info_sizeof());
if (!devpath) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
open_dev = open(devpath, O_RDONLY);
if (open_dev < 0) {
AFB_API_ERROR(mixer->api, "%s: Unable to open %s", __func__, devpath);
goto fail_cardinfo;
}
int rc = ioctl(open_dev, SNDRV_CTL_IOCTL_CARD_INFO(snd_ctl_card_info_sizeof()), cardInfo);
if (rc < 0) {
AFB_API_ERROR(mixer->api, "%s: ioctl on %s failed", __func__, devpath);
goto fail_dev;
}
close(open_dev);
return cardInfo;
fail_dev:
close(open_dev);
fail_cardinfo:
free(cardInfo);
fail:
return NULL;
}
PUBLIC AlsaPcmCtlT * AlsaPcmCtlNew(SoftMixerT* mixer, const char * name) {
AFB_API_DEBUG(mixer->api, "%s: NEW %s",__func__, name);
AlsaPcmCtlT *pcmCtl = calloc(1, sizeof (AlsaPcmCtlT));
if (pcmCtl == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
pcmCtl->name = name;
pcmCtl->closeAtDeletion = false;
AlsaMixerTransactionObjectAdd(mixer->transaction, pcmCtl, AlsaPcmCtlDelete);
fail:
return pcmCtl;
}
PUBLIC void AlsaPcmCtlDelete(SoftMixerT* mixer, void * arg) {
int error = 0;
AlsaPcmCtlT * pcmCtl = (AlsaPcmCtlT *) arg;
AFB_API_DEBUG(mixer->api, "%s of %s (plug: %d)", __func__, pcmCtl->name, pcmCtl->isPcmPlug);
if (pcmCtl->private_data_clean)
pcmCtl->private_data_clean(mixer, pcmCtl->private_data);
if (!pcmCtl->closeAtDeletion)
goto done;
AFB_API_DEBUG(mixer->api, "%s: Closing %s", __func__, pcmCtl->cid.cardid);
error = snd_pcm_close(pcmCtl->handle);
if (error) {
// It's safe to ignore this error. In case of ioplug PCM, the device may have already disappeared
AFB_API_DEBUG(mixer->api,
"%s: failed to close capture PCM %s: err=%s", __func__, pcmCtl->cid.cardid, snd_strerror(error));
}
done:
ApiPcmDelParams(mixer, pcmCtl->params);
free((char*) pcmCtl->cid.cardid);
free(pcmCtl);
AFB_API_DEBUG(mixer->api, "%s DONE", __func__);
}
PUBLIC AlsaPcmCtlT *AlsaByPathOpenPcmCtl(SoftMixerT *mixer, AlsaDevInfoT *pcmDev, snd_pcm_stream_t direction) {
int error;
char *cardid = NULL;
AlsaPcmCtlT *pcmCtl = NULL;
if (pcmDev->pcmplug_params) {
pcmDev->cardid = strdup(pcmDev->pcmplug_params);
if (pcmDev->cardid == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
}
if (!pcmDev->cardid) {
if (pcmDev->subdev) {
if (asprintf(&cardid, "hw:%i,%i,%i", pcmDev->cardidx, pcmDev->device, pcmDev->subdev) == -1) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
}
else if (pcmDev->device) {
if (asprintf(&cardid, "hw:%i,%i", pcmDev->cardidx, pcmDev->device) == -1) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
}
else {
if (asprintf(&cardid, "hw:%i", pcmDev->cardidx) == -1) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
}
pcmDev->cardid = (const char*)cardid;
}
pcmCtl = AlsaPcmCtlNew(mixer, pcmDev->cardid);
if (pcmCtl == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail_cardid;
}
// inherit CID from 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;
if (pcmDev->pcmplug_params)
pcmCtl->isPcmPlug = true;
AFB_API_DEBUG(mixer->api,
"%s OPEN PCM '%s', direction %s",
__func__, pcmDev->cardid, direction==SND_PCM_STREAM_PLAYBACK?"playback":"capture");
error = snd_pcm_open(&pcmCtl->handle, pcmCtl->cid.cardid, direction, SND_PCM_NONBLOCK);
if (error < 0) {
AFB_API_ERROR(mixer->api, "%s: fail openpcm cardid=%s error=%s", __func__, pcmCtl->cid.cardid, snd_strerror(error));
goto fail_pcmctl;
}
return pcmCtl;
fail_pcmctl:
free(pcmCtl);
fail_cardid:
free((char*)pcmDev->cardid);
fail:
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;
AFB_API_DEBUG(mixer->api, "%s: devpath %s, cardid %s, plug %s", __func__, dev->cid.devpath, dev->cid.cardid, dev->cid.pcmplug_params);
if (dev->cid.devpath)
cardInfo = AlsaByPathInfo(mixer, dev->cid.devpath);
else if (dev->cid.cardid)
cardInfo = AlsaCtlGetCardInfo(mixer, dev->cid.cardid);
else if (dev->cid.pcmplug_params) {
AFB_API_DEBUG(mixer->api, "Get card info from plug params %s", dev->cid.pcmplug_params);
cardInfo = AlsaCtlGetCardInfo(mixer, dev->cid.pcmplug_params);
}
if (!cardInfo) {
AFB_API_ERROR(mixer->api,
"%s: uid=%s fail to find sndcard by path=%s id=%s",
__func__, uid, dev->cid.devpath, dev->cid.cardid);
goto fail;
}
// 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));
if (dev->cid.name == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail;
}
dev->cid.longname = strdup(snd_ctl_card_info_get_longname(cardInfo));
if (dev->cid.longname == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto fail_cid_name;
}
// build a valid name and open sndcard
if (asprintf((char**) &dev->cid.cardid, "hw:%i", dev->cid.cardidx) == -1) {
SOFTMIXER_NOMEM(mixer->api);
goto fail_cid_longname;
}
if ((err = snd_ctl_open(&handle, dev->cid.cardid, 0)) < 0) {
AFB_API_ERROR(mixer->api,
"%s uid=%s sndcard open fail cardid=%s longname=%s error=%s",
__func__, uid, dev->cid.cardid, dev->cid.longname, snd_strerror(err));
goto fail_cardid;
}
AFB_API_NOTICE(mixer->api,
"%s: uid=%s cardid=%s cardname=%s pcmplug %s",
__func__, uid, dev->cid.cardid, dev->cid.longname, dev->cid.pcmplug_params);
free(cardInfo);
return handle;
fail_cid_longname:
free((char*)dev->cid.longname);
fail_cid_name:
free((char*)dev->cid.name);
fail_cardid:
free((char*)dev->cid.cardid);
fail:
return NULL;
}
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