From: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date: Mon, 18 Nov 2019 04:22:44 +0000 (+0900)
Subject: rawmidi: stream_pair: add an API to drop queued data for attached substream
X-Git-Tag: v0.1.0~172
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=9833cf31e5a46801a0c41c30fb4805d9fc4b54ce;p=alsa-gobject.git

rawmidi: stream_pair: add an API to drop queued data for attached substream

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

diff --git a/src/rawmidi/alsarawmidi.map b/src/rawmidi/alsarawmidi.map
index 0429bf3..9f81ab1 100644
--- a/src/rawmidi/alsarawmidi.map
+++ b/src/rawmidi/alsarawmidi.map
@@ -20,6 +20,7 @@ ALSA_GOBJECT_0_0_0 {
     "alsarawmidi_stream_pair_read_from_substream";
     "alsarawmidi_stream_pair_write_to_substream";
     "alsarawmidi_stream_pair_drain_substream";
+    "alsarawmidi_stream_pair_drop_substream";
 
     "alsarawmidi_substream_params_get_type";
     "alsarawmidi_substream_params_new";
diff --git a/src/rawmidi/stream-pair.c b/src/rawmidi/stream-pair.c
index bede69f..265e0c2 100644
--- a/src/rawmidi/stream-pair.c
+++ b/src/rawmidi/stream-pair.c
@@ -324,3 +324,26 @@ void alsarawmidi_stream_pair_drain_substream(ALSARawmidiStreamPair *self,
     if (ioctl(priv->fd, SNDRV_RAWMIDI_IOCTL_DRAIN, &direction) < 0)
         generate_error(error, errno);
 }
+
+/**
+ * alsarawmidi_stream_pair_drop:
+ * @self: A #ALSARawmidiStreamPair.
+ * @direction: The direction of substream attached to the stream pair.
+ * @err: A #GError.
+ *
+ * Drop queued data in intermediate buffer immediately for substream attached
+ * to the pair of streams. In implementation of ALSA rawmidi core, the
+ * direction should be for output substream.
+ */
+void alsarawmidi_stream_pair_drop_substream(ALSARawmidiStreamPair *self,
+                                        ALSARawmidiStreamDirection direction,
+                                        GError **error)
+{
+    ALSARawmidiStreamPairPrivate *priv;
+
+    g_return_if_fail(ALSARAWMIDI_IS_STREAM_PAIR(self));
+    priv = alsarawmidi_stream_pair_get_instance_private(self);
+
+    if (ioctl(priv->fd, SNDRV_RAWMIDI_IOCTL_DROP, &direction) < 0)
+        generate_error(error, errno);
+}
diff --git a/src/rawmidi/stream-pair.h b/src/rawmidi/stream-pair.h
index 7f2ddc9..79a4d8e 100644
--- a/src/rawmidi/stream-pair.h
+++ b/src/rawmidi/stream-pair.h
@@ -83,6 +83,10 @@ void alsarawmidi_stream_pair_drain_substream(ALSARawmidiStreamPair *self,
                                         ALSARawmidiStreamDirection direction,
                                         GError **error);
 
+void alsarawmidi_stream_pair_drop_substream(ALSARawmidiStreamPair *self,
+                                        ALSARawmidiStreamDirection direction,
+                                        GError **error);
+
 G_END_DECLS
 
 #endif
diff --git a/tests/alsarawmidi-stream-pair b/tests/alsarawmidi-stream-pair
index 7457b9d..3002461 100644
--- a/tests/alsarawmidi-stream-pair
+++ b/tests/alsarawmidi-stream-pair
@@ -22,6 +22,7 @@ methods = (
     'read_from_substream',
     'write_to_substream',
     'drain_substream',
+    'drop_substream',
 )
 signals = ()