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-rw-r--r--plugins/alsa/alsa-utils-bypath.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-utils-bypath.c b/plugins/alsa/alsa-utils-bypath.c
new file mode 100644
index 0000000..e4a8833
--- /dev/null
+++ b/plugins/alsa/alsa-utils-bypath.c
@@ -0,0 +1,127 @@
+/*
+ * 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 snd_pcm_t* AlsaByPathOpenPcm(CtlSourceT *source, AlsaDevByPathT *dev, snd_pcm_stream_t direction) {
+ char pcmName[32];
+ int error;
+ snd_pcm_t *pcmHandle;
+
+ // 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->devid) cardInfo = AlsaCtlGetInfo (source, dev->devid);
+
+ if (!cardInfo) {
+ AFB_ApiError(source->api, "AlsaByPathOpenPcm: fail to find sndcard by path=%s id=%s", dev->devpath, dev->devid);
+ goto OnErrorExit;
+ }
+
+ // extract useful info from cardInfo handle
+ int cardIdx = snd_ctl_card_info_get_card(cardInfo);
+ const char *cardName = snd_ctl_card_info_get_name(cardInfo);
+
+ // build a valid name and open sndcard
+ snprintf(pcmName, sizeof (pcmName), "hw:%i,%i,%i", cardIdx, dev->device, dev->subdev);
+ error = snd_pcm_open(&pcmHandle, pcmName, direction, SND_PCM_NONBLOCK);
+ if (error) {
+ AFB_ApiError(source->api, "AlsaByPathOpenPcm: fail openpcm (hw:%d -> %s name=%i subdev=%d): %s"
+ , cardIdx, cardName, dev->device, dev->subdev, snd_strerror(error));
+ goto OnErrorExit;
+ }
+
+ return (pcmHandle);
+
+OnErrorExit:
+ return NULL;
+}
+
+PUBLIC snd_ctl_t *AlsaByPathOpenCtl (CtlSourceT *source, AlsaDevByPathT *dev) {
+ int err;
+ char devid[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->devid) cardInfo = AlsaCtlGetInfo (source, dev->devid);
+
+ if (!cardInfo) {
+ AFB_ApiError(source->api, "AlsaByPathOpenCtl: fail to find sndcard by path=%s id=%s", dev->devpath, dev->devid);
+ 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(devid, sizeof (devid), "hw:%i", cardIndex);
+ if ((err = snd_ctl_open(&handle, devid, 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;
+}