From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date: Sun, 21 Jun 2020 12:35:14 +0000 (+0900)
Subject: seq: add an API to retrieve current version of protocol in sequencer interface
X-Git-Tag: v0.1.0~5
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=2eb591115d9748324ff0d4b017639f1ac1ece16f;p=alsa-gobject.git

seq: add an API to retrieve current version of protocol in sequencer interface

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---

diff --git a/src/seq/alsaseq.map b/src/seq/alsaseq.map
index c07d13c..22ed438 100644
--- a/src/seq/alsaseq.map
+++ b/src/seq/alsaseq.map
@@ -42,6 +42,7 @@ ALSA_GOBJECT_0_0_0 {
     "alsaseq_user_client_get_type";
     "alsaseq_user_client_new";
     "alsaseq_user_client_open";
+    "alsaseq_user_client_get_protocol_version";
     "alsaseq_user_client_set_info";
     "alsaseq_user_client_get_info";
     "alsaseq_user_client_create_port";
diff --git a/src/seq/user-client.c b/src/seq/user-client.c
index 32ba0d5..1337cd5 100644
--- a/src/seq/user-client.c
+++ b/src/seq/user-client.c
@@ -29,6 +29,7 @@
 struct _ALSASeqUserClientPrivate {
     int fd;
     int client_id;
+    guint16 proto_ver_triplet[3];
 };
 G_DEFINE_TYPE_WITH_PRIVATE(ALSASeqUserClient, alsaseq_user_client, G_TYPE_OBJECT)
 
@@ -155,6 +156,7 @@ void alsaseq_user_client_open(ALSASeqUserClient *self, gint open_flag,
 {
     ALSASeqUserClientPrivate *priv;
     char *devnode;
+    int proto_ver;
 
     g_return_if_fail(ALSASEQ_IS_USER_CLIENT(self));
     priv = alsaseq_user_client_get_instance_private(self);
@@ -176,6 +178,47 @@ void alsaseq_user_client_open(ALSASeqUserClient *self, gint open_flag,
         close(priv->fd);
         priv->fd = -1;
     }
+
+    // Remember the version of protocol currently used.
+    if (ioctl(priv->fd, SNDRV_SEQ_IOCTL_PVERSION, &proto_ver) < 0) {
+        generate_error(error, errno);
+        close(priv->fd);
+        priv->fd = -1;
+        return;
+    }
+
+    priv->proto_ver_triplet[0] = SNDRV_PROTOCOL_MAJOR(proto_ver);
+    priv->proto_ver_triplet[1] = SNDRV_PROTOCOL_MINOR(proto_ver);
+    priv->proto_ver_triplet[2] = SNDRV_PROTOCOL_MICRO(proto_ver);
+}
+
+/**
+ * alsaseq_user_client_get_protocol_version:
+ * @self: A #ALSASeqUserClient.
+ * @proto_ver_triplet: (array fixed-size=3)(out)(transfer none): The version of
+ *                     protocol currently used.
+ * @error: A #GError.
+ *
+ * Get the version of sequencer protocol currently used. The version is
+ * represented as the array with three elements; major, minor, and micro version
+ * in the order. The length of major version is 16 bit, the length of minor
+ * and micro version is 8 bit each.
+ */
+void alsaseq_user_client_get_protocol_version(ALSASeqUserClient *self,
+                                        const guint16 *proto_ver_triplet[3],
+                                        GError **error)
+{
+    ALSASeqUserClientPrivate *priv;
+
+    g_return_if_fail(ALSASEQ_IS_USER_CLIENT(self));
+    priv = alsaseq_user_client_get_instance_private(self);
+
+    if (priv->fd < 0) {
+        generate_error(error, ENXIO);
+        return;
+    }
+
+    *proto_ver_triplet = (const guint16 *)priv->proto_ver_triplet;
 }
 
 /**
diff --git a/src/seq/user-client.h b/src/seq/user-client.h
index 160e03b..0a98fdc 100644
--- a/src/seq/user-client.h
+++ b/src/seq/user-client.h
@@ -74,6 +74,10 @@ ALSASeqUserClient *alsaseq_user_client_new();
 void alsaseq_user_client_open(ALSASeqUserClient *self, gint open_flag,
                               GError **error);
 
+void alsaseq_user_client_get_protocol_version(ALSASeqUserClient *self,
+                                        const guint16 *proto_ver_triplet[3],
+                                        GError **error);
+
 void alsaseq_user_client_set_info(ALSASeqUserClient *self,
                                   ALSASeqClientInfo *client_info,
                                   GError **error);
diff --git a/tests/alsaseq-user-client b/tests/alsaseq-user-client
index dbe508c..896c370 100644
--- a/tests/alsaseq-user-client
+++ b/tests/alsaseq-user-client
@@ -16,6 +16,7 @@ props = (
 methods = (
     'new',
     'open',
+    'get_protocol_version',
     'set_info',
     'get_info',
     'create_port',