Implement a basic non-real-time loopback device

Currently it behaves just like a normal device except contexts are only
processed during calls to alcRenderSamples. Additionally, the ALC_SYNC and
ALC_REFRESH context attributes are not valid for these devices, and there are
two new context attributes to specify the rendering format: ALC_FORMAT_TYPE
and ALC_FORMAT_CHANNELS. These each take one of the type and channel enums
added.
This stuff is subject to change.

1 files changed, 76 insertions, 0 deletions

diff --git a/Alc/loopback.c b/Alc/loopback.c
new file mode 100644
index 00000000..036e72c1
--- /dev/null
+++ b/Alc/loopback.c
@@ -0,0 +1,76 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2011 by Chris Robinson
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ *  Boston, MA  02111-1307, USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include "alMain.h"
+#include "AL/al.h"
+#include "AL/alc.h"
+
+
+static ALCboolean loopback_open_playback(ALCdevice *device, const ALCchar *deviceName)
+{
+    device->szDeviceName = strdup(deviceName);
+    return ALC_TRUE;
+}
+
+static void loopback_close_playback(ALCdevice *device)
+{
+    (void)device;
+}
+
+static ALCboolean loopback_reset_playback(ALCdevice *device)
+{
+    SetDefaultWFXChannelOrder(device);
+    return ALC_TRUE;
+}
+
+static void loopback_stop_playback(ALCdevice *device)
+{
+    (void)device;
+}
+
+static BackendFuncs loopback_funcs = {
+    loopback_open_playback,
+    loopback_close_playback,
+    loopback_reset_playback,
+    loopback_stop_playback,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+
+void alc_loopback_init(BackendFuncs *func_list)
+{
+    *func_list = loopback_funcs;
+}
+
+void alc_loopback_deinit(void)
+{
+}
+
+void alc_loopback_probe(int type)
+{
+    (void)type;
+}