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 drain queued data for attached substream
X-Git-Tag: v0.1.0~173
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=9b23c028ef5851d0d196fc8409829a6efd037c66;p=alsa-gobject.git

rawmidi: stream_pair: add an API to drain 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 2994533..0429bf3 100644
--- a/src/rawmidi/alsarawmidi.map
+++ b/src/rawmidi/alsarawmidi.map
@@ -19,6 +19,7 @@ ALSA_GOBJECT_0_0_0 {
     "alsarawmidi_stream_pair_get_substream_status";
     "alsarawmidi_stream_pair_read_from_substream";
     "alsarawmidi_stream_pair_write_to_substream";
+    "alsarawmidi_stream_pair_drain_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 0bf91bc..bede69f 100644
--- a/src/rawmidi/stream-pair.c
+++ b/src/rawmidi/stream-pair.c
@@ -300,3 +300,27 @@ void alsarawmidi_stream_pair_write_to_substream(ALSARawmidiStreamPair *self,
         return;
     }
 }
+
+/**
+ * alsarawmidi_stream_pair_drain:
+ * @self: A #ALSARawmidiStreamPair.
+ * @direction: The direction of substream attached to the stream pair.
+ * @error: A #GError.
+ *
+ * Drain queued data in intermediate buffer for substream attached to the pair
+ * of streams. In a case that the instance is opened without O_NONBLOCK and the
+ * call is for output substream and any data is in the intermediate buffer, the
+ * call is blocked till no data is in the intermediate buffer.
+ */
+void alsarawmidi_stream_pair_drain_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_DRAIN, &direction) < 0)
+        generate_error(error, errno);
+}
diff --git a/src/rawmidi/stream-pair.h b/src/rawmidi/stream-pair.h
index ffa80e6..7f2ddc9 100644
--- a/src/rawmidi/stream-pair.h
+++ b/src/rawmidi/stream-pair.h
@@ -79,6 +79,10 @@ void alsarawmidi_stream_pair_write_to_substream(ALSARawmidiStreamPair *self,
                                         const guint8 *buf, gsize buf_size,
                                         GError **error);
 
+void alsarawmidi_stream_pair_drain_substream(ALSARawmidiStreamPair *self,
+                                        ALSARawmidiStreamDirection direction,
+                                        GError **error);
+
 G_END_DECLS
 
 #endif
diff --git a/tests/alsarawmidi-stream-pair b/tests/alsarawmidi-stream-pair
index 433c74d..7457b9d 100644
--- a/tests/alsarawmidi-stream-pair
+++ b/tests/alsarawmidi-stream-pair
@@ -21,6 +21,7 @@ methods = (
     'get_substream_status',
     'read_from_substream',
     'write_to_substream',
+    'drain_substream',
 )
 signals = ()