1 files changed, 55 insertions, 0 deletions
diff --git a/plugins/alsa/alsa-tools-low.c b/plugins/alsa/alsa-tools-low.c
new file mode 100644
index 0000000..57b5e5c
--- /dev/null
+++ b/plugins/alsa/alsa-tools-low.c
@@ -0,0 +1,55 @@
+/*
+ * 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
+int AlsaCardInfoByPath (const char *devpath) {
+    int open_dev;
+    snd_ctl_card_info_t *cardinfo = alloca(snd_ctl_card_info_sizeof());
+
+    open_dev = open(devpath, O_RDONLY);
+    if (open_dev >= 0) {
+        int rc = ioctl(open_dev, SNDRV_CTL_IOCTL_CARD_INFO(snd_ctl_card_info_sizeof()), cardinfo);
+        if (rc < 0) {
+            int err = -errno;
+            close(open_dev);
+            return err;
+        }
+        close(open_dev);
+        int cardId = snd_ctl_card_info_get_card(cardinfo);
+        return cardId;
+    } else {
+        return -errno;
+    }
+}
+