sys/osxaudio/Makefile.am: New OS X audio plugin by Zaheer Merali

Original commit message from CVS:
* sys/osxaudio/Makefile.am:  New OS X audio plugin by Zaheer Merali
* sys/osxaudio/gstosxaudio.c:
* sys/osxaudio/gstosxaudioelement.c:
* sys/osxaudio/gstosxaudioelement.h:
* sys/osxaudio/gstosxaudiosink.c:
* sys/osxaudio/gstosxaudiosink.h:
* sys/osxaudio/gstosxaudiosrc.c:
* sys/osxaudio/gstosxaudiosrc.h:

8 files changed, 1219 insertions, 0 deletions

diff --git a/sys/osxaudio/Makefile.am b/sys/osxaudio/Makefile.am
new file mode 100644
index 00000000..7d6bcfa7
--- /dev/null
+++ b/sys/osxaudio/Makefile.am
@@ -0,0 +1,17 @@
+plugin_LTLIBRARIES = libgstosxaudio.la
+
+libgstosxaudio_la_SOURCES = gstosxaudio.c	\
+			    gstosxaudioelement.c	\
+			    gstosxaudiosink.c		\
+			    gstosxaudiosrc.c
+
+libgstosxaudio_la_CFLAGS = $(GST_CFLAGS)
+libgstosxaudio_la_LIBADD = $(top_builddir)/gst-libs/gst/libgstinterfaces-@GST_MAJORMINOR@.la
+libgstosxaudio_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -framework CoreAudio
+
+noinst_HEADERS = gstosxaudiosink.h	\
+		gstosxaudioelement.h	\
+		gstosxaudiosrc.h
+
+
+
diff --git a/sys/osxaudio/gstosxaudio.c b/sys/osxaudio/gstosxaudio.c
new file mode 100644
index 00000000..d3b6dd04
--- /dev/null
+++ b/sys/osxaudio/gstosxaudio.c
@@ -0,0 +1,58 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+
+#include "gstosxaudioelement.h"
+#include "gstosxaudiosink.h"
+#include "gstosxaudiosrc.h"
+extern gchar *__gst_osxaudio_plugin_dir;
+
+GST_DEBUG_CATEGORY (osxaudio_debug);
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  if (!gst_library_load ("gstaudio"))
+    return FALSE;
+
+
+  if (!gst_element_register (plugin, "osxaudiosink", GST_RANK_PRIMARY,
+          GST_TYPE_OSXAUDIOSINK)) {
+    return FALSE;
+  }
+  if (!gst_element_register (plugin, "osxaudiosrc", GST_RANK_PRIMARY,
+          GST_TYPE_OSXAUDIOSRC)) {
+    return FALSE;
+  }
+
+  GST_DEBUG_CATEGORY_INIT (osxaudio_debug, "osx", 0, "OSX audio elements");
+
+
+  return TRUE;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    "osxaudio",
+    "OSX (Mac OS X) audio support for GStreamer",
+    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)
diff --git a/sys/osxaudio/gstosxaudioelement.c b/sys/osxaudio/gstosxaudioelement.c
new file mode 100644
index 00000000..5a25eb0f
--- /dev/null
+++ b/sys/osxaudio/gstosxaudioelement.c
@@ -0,0 +1,450 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wim.taymans@chello.be>
+ *
+ * gstosxaudioelement.c: 
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <CoreAudio/CoreAudio.h>
+#include <pthread.h>
+
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include "gstosxaudioelement.h"
+
+enum
+{
+  ARG_0,
+  ARG_DEVICE,
+};
+
+/* elementfactory information */
+static GstElementDetails gst_osxaudioelement_details =
+GST_ELEMENT_DETAILS ("Audio Mixer (OSX)",
+    "Generic/Audio",
+    "Mac OS X audio mixer element",
+    "Zaheer Abbas Merali <zaheerabbas at merali.org>");
+
+static void gst_osxaudioelement_base_init (GstOsxAudioElementClass * klass);
+static void gst_osxaudioelement_class_init (GstOsxAudioElementClass * klass);
+
+static void gst_osxaudioelement_init (GstOsxAudioElement * osxaudio);
+static void gst_osxaudioelement_dispose (GObject * object);
+
+static void gst_osxaudioelement_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_osxaudioelement_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+static GstElementStateReturn gst_osxaudioelement_change_state (GstElement *
+    element);
+
+static GstElementClass *parent_class = NULL;
+
+
+GType
+gst_osxaudioelement_get_type (void)
+{
+  static GType osxaudioelement_type = 0;
+
+  if (!osxaudioelement_type) {
+    static const GTypeInfo osxaudioelement_info = {
+      sizeof (GstOsxAudioElementClass),
+      (GBaseInitFunc) gst_osxaudioelement_base_init,
+      NULL,
+      (GClassInitFunc) gst_osxaudioelement_class_init,
+      NULL,
+      NULL,
+      sizeof (GstOsxAudioElement),
+      0,
+      (GInstanceInitFunc) gst_osxaudioelement_init
+    };
+
+    osxaudioelement_type = g_type_register_static (GST_TYPE_ELEMENT,
+        "GstOsxAudioElement", &osxaudioelement_info, 0);
+  }
+
+  return osxaudioelement_type;
+}
+
+static void
+gst_osxaudioelement_base_init (GstOsxAudioElementClass * klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  klass->device_combinations = NULL;
+
+  gst_element_class_set_details (element_class, &gst_osxaudioelement_details);
+}
+
+static void
+gst_osxaudioelement_class_init (GstOsxAudioElementClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DEVICE,
+      g_param_spec_int ("device", "Device index",
+          "Mac OS X CoreAudio Device Index (0 usually)", 0, G_MAXINT, 0,
+          G_PARAM_READWRITE));
+  gobject_class->set_property = gst_osxaudioelement_set_property;
+  gobject_class->get_property = gst_osxaudioelement_get_property;
+  gobject_class->dispose = gst_osxaudioelement_dispose;
+
+  gstelement_class->change_state = gst_osxaudioelement_change_state;
+}
+
+static void
+gst_osxaudioelement_init (GstOsxAudioElement * osxaudio)
+{
+  OSStatus status;
+  UInt32 propertySize;
+
+  pthread_mutex_init (&osxaudio->buffer_mutex, NULL);
+  pthread_mutex_unlock (&osxaudio->buffer_mutex);
+  propertySize = sizeof (osxaudio->device_id);
+  status =
+      AudioHardwareGetProperty (kAudioHardwarePropertyDefaultOutputDevice,
+      &propertySize, &(osxaudio->device_id));
+
+  if (status) {
+    GST_DEBUG ("AudioHardwareGetProperty returned %d\n", (int) status);
+  }
+  if (osxaudio->device_id == kAudioDeviceUnknown) {
+    GST_DEBUG ("AudioHardwareGetProperty: device_id is kAudioDeviceUnknown\n");
+  }
+  /* get requested buffer length */
+  propertySize = sizeof (osxaudio->buffer_len);
+  status =
+      AudioDeviceGetProperty (osxaudio->device_id, 0, false,
+      kAudioDevicePropertyBufferSize, &propertySize, &osxaudio->buffer_len);
+  if (status) {
+    GST_DEBUG
+        ("AudioDeviceGetProperty returned %d when getting kAudioDevicePropertyBufferSize\n",
+        (int) status);
+  }
+  GST_DEBUG ("%5d osxaudio->buffer_len\n", (int) osxaudio->buffer_len);
+
+}
+
+static void
+gst_osxaudioelement_dispose (GObject * object)
+{
+  GstOsxAudioElement *osxaudio = (GstOsxAudioElement *) object;
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+/* General purpose Ring-buffering routines */
+int
+write_buffer (GstOsxAudioElement * osxaudio, unsigned char *data, int len)
+{
+  int len2 = 0;
+  int x;
+
+  while (len > 0) {
+    if (osxaudio->full_buffers == NUM_BUFS) {
+      GST_DEBUG ("Buffer overrun\n");
+      break;
+    }
+
+    x = osxaudio->buffer_len - osxaudio->buf_write_pos;
+    if (x > len)
+      x = len;
+    memcpy (osxaudio->buffer[osxaudio->buf_write] + osxaudio->buf_write_pos,
+        data + len2, x);
+
+    /* accessing common variables, locking mutex */
+    pthread_mutex_lock (&osxaudio->buffer_mutex);
+    len2 += x;
+    len -= x;
+    osxaudio->buffered_bytes += x;
+    osxaudio->buf_write_pos += x;
+    if (osxaudio->buf_write_pos >= osxaudio->buffer_len) {
+      /* block is full, find next! */
+      osxaudio->buf_write = (osxaudio->buf_write + 1) % NUM_BUFS;
+      ++osxaudio->full_buffers;
+      osxaudio->buf_write_pos = 0;
+    }
+    pthread_mutex_unlock (&osxaudio->buffer_mutex);
+  }
+
+  return len2;
+}
+
+int
+read_buffer (GstOsxAudioElement * osxaudio, unsigned char *data)
+{
+  int len2 = 0;
+  int len = osxaudio->buffer_len;
+  int x;
+
+  while (len > 0) {
+    if (osxaudio->full_buffers == 0) {
+      GST_DEBUG ("Buffer underrun\n");
+      break;
+    }
+
+    x = osxaudio->buffer_len - osxaudio->buf_read_pos;
+    if (x > len)
+      x = len;
+    memcpy (data + len2,
+        osxaudio->buffer[osxaudio->buf_read] + osxaudio->buf_read_pos, x);
+    len2 += x;
+    len -= x;
+
+    /* accessing common variables, locking mutex */
+    pthread_mutex_lock (&osxaudio->buffer_mutex);
+    osxaudio->buffered_bytes -= x;
+    osxaudio->buf_read_pos += x;
+    if (osxaudio->buf_read_pos >= osxaudio->buffer_len) {
+      /* block is empty, find next! */
+      osxaudio->buf_read = (osxaudio->buf_read + 1) % NUM_BUFS;
+      --osxaudio->full_buffers;
+      osxaudio->buf_read_pos = 0;
+    }
+    pthread_mutex_unlock (&osxaudio->buffer_mutex);
+  }
+
+
+  return len2;
+}
+
+/* The function that the CoreAudio thread calls when it has data */
+OSStatus
+inputAudioDeviceIOProc (AudioDeviceID inDevice, const AudioTimeStamp * inNow,
+    const AudioBufferList * inInputData, const AudioTimeStamp * inInputTime,
+    AudioBufferList * outOutputData, const AudioTimeStamp * inOutputTime,
+    void *inClientData)
+{
+  GstOsxAudioElement *osxaudio = GST_OSXAUDIOELEMENT (inClientData);
+
+  write_buffer (GST_OSXAUDIOELEMENT (osxaudio),
+      (char *) inInputData->mBuffers[0].mData, osxaudio->buffer_len);
+
+  return 0;
+}
+
+/* The function that the CoreAudio thread calls when it wants more data */
+
+OSStatus
+outputAudioDeviceIOProc (AudioDeviceID inDevice, const AudioTimeStamp * inNow,
+    const AudioBufferList * inInputData, const AudioTimeStamp * inInputTime,
+    AudioBufferList * outOutputData, const AudioTimeStamp * inOutputTime,
+    void *inClientData)
+{
+  GstOsxAudioElement *osxaudio = GST_OSXAUDIOELEMENT (inClientData);
+
+  outOutputData->mBuffers[0].mDataByteSize =
+      read_buffer (osxaudio, (char *) outOutputData->mBuffers[0].mData);
+
+  return 0;
+}
+
+static gboolean
+gst_osxaudioelement_open_audio (GstOsxAudioElement * osxaudio, gboolean input)
+{
+  gint caps;
+  int i;
+  OSErr status;
+
+  GST_INFO ("osxaudioelement: attempting to open sound device");
+
+  /* Allocate ring-buffer memory */
+  for (i = 0; i < NUM_BUFS; i++)
+    osxaudio->buffer[i] = (unsigned char *) malloc (osxaudio->buffer_len);
+  if (input) {
+    status =
+        AudioDeviceAddIOProc (osxaudio->device_id, inputAudioDeviceIOProc,
+        osxaudio);
+  } else {
+    /* Set the IO proc that CoreAudio will call when it needs data */
+    status =
+        AudioDeviceAddIOProc (osxaudio->device_id, outputAudioDeviceIOProc,
+        osxaudio);
+  }
+  if (status) {
+    GST_DEBUG ("AudioDeviceAddIOProc returned %d\n", (int) status);
+    return FALSE;
+  }
+
+  pthread_mutex_lock (&osxaudio->buffer_mutex);
+
+  /* reset ring-buffer state */
+  osxaudio->buf_read = 0;
+  osxaudio->buf_write = 0;
+  osxaudio->buf_read_pos = 0;
+  osxaudio->buf_write_pos = 0;
+
+  osxaudio->full_buffers = 0;
+  osxaudio->buffered_bytes = 0;
+
+  /* zero buffer */
+  for (i = 0; i < NUM_BUFS; i++)
+    bzero (osxaudio->buffer[i], osxaudio->buffer_len);
+
+  pthread_mutex_unlock (&osxaudio->buffer_mutex);
+
+  return TRUE;
+}
+
+static void
+gst_osxaudioelement_close_audio (GstOsxAudioElement * osxaudio, gboolean input)
+{
+  OSErr status;
+  int i;
+
+  /* stop callback */
+  if (input) {
+    status = AudioDeviceStop (osxaudio->device_id, inputAudioDeviceIOProc);
+  } else {
+    status = AudioDeviceStop (osxaudio->device_id, outputAudioDeviceIOProc);
+  }
+  if (status)
+    GST_DEBUG ("AudioDeviceStop returned %d\n", (int) status);
+
+  if (input) {
+    status =
+        AudioDeviceRemoveIOProc (osxaudio->device_id, inputAudioDeviceIOProc);
+  } else {
+    status =
+        AudioDeviceRemoveIOProc (osxaudio->device_id, outputAudioDeviceIOProc);
+  }
+  if (status)
+    GST_DEBUG ("AudioDeviceRemoveIOProc " "returned %d\n", (int) status);
+
+  for (i = 0; i < NUM_BUFS; i++)
+    free (osxaudio->buffer[i]);
+
+}
+
+static void
+gst_osxaudioelement_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  GstOsxAudioElement *osxaudio = GST_OSXAUDIOELEMENT (object);
+  OSStatus status;
+  int nDevices;
+  UInt32 propertySize;
+  int deviceid;
+  AudioDeviceID *devids;
+
+  switch (prop_id) {
+    case ARG_DEVICE:
+      /* check index given is in bounds, if not use default device */
+      status = AudioHardwareGetPropertyInfo (kAudioHardwarePropertyDevices,
+          &propertySize, NULL);
+      nDevices = propertySize / sizeof (AudioDeviceID);
+      deviceid = g_value_get_int (value);
+      if (deviceid < nDevices) {
+        devids = malloc (propertySize);
+        status =
+            AudioHardwareGetProperty (kAudioHardwarePropertyDevices,
+            &propertySize, devids);
+        osxaudio->device_id = devids[deviceid];
+        free (devids);
+      } else {
+        GST_DEBUG ("device index %d out of range.  Max index is currently %d\n",
+            deviceid, nDevices);
+      }
+      break;
+    default:
+      break;
+  }
+}
+
+static void
+gst_osxaudioelement_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  GstOsxAudioElement *osxaudio = GST_OSXAUDIOELEMENT (object);
+  OSStatus status;
+  int nDevices;
+  UInt32 propertySize;
+  int deviceid;
+  AudioDeviceID *devids;
+  int i;
+
+  switch (prop_id) {
+    case ARG_DEVICE:
+      /* figure out what index the current one is */
+      status = AudioHardwareGetPropertyInfo (kAudioHardwarePropertyDevices,
+          &propertySize, NULL);
+      nDevices = propertySize / sizeof (AudioDeviceID);
+      devids = malloc (propertySize);
+      status =
+          AudioHardwareGetProperty (kAudioHardwarePropertyDevices,
+          &propertySize, devids);
+      for (i = 0; i < nDevices; i++) {
+        if (osxaudio->device_id == devids[i])
+          break;
+      }
+      g_value_set_int (value, i);
+      free (devids);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstElementStateReturn
+gst_osxaudioelement_change_state (GstElement * element)
+{
+  GstOsxAudioElement *osxaudio = GST_OSXAUDIOELEMENT (element);
+  const GList *padlist;
+  gboolean input = TRUE;
+
+  padlist = gst_element_get_pad_list (element);
+  if (padlist != NULL) {
+    GstPad *firstpad = padlist->data;
+
+    if (GST_PAD_IS_SINK (firstpad)) {
+      input = FALSE;
+    }
+  }
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_NULL_TO_READY:
+      if (!gst_osxaudioelement_open_audio (osxaudio, input)) {
+        return GST_STATE_FAILURE;
+      }
+      GST_INFO ("osxaudioelement: opened sound device");
+      break;
+    case GST_STATE_READY_TO_NULL:
+      gst_osxaudioelement_close_audio (osxaudio, input);
+      GST_INFO ("osxaudioelement: closed sound device");
+      break;
+    default:
+      break;
+  }
+
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
diff --git a/sys/osxaudio/gstosxaudioelement.h b/sys/osxaudio/gstosxaudioelement.h
new file mode 100644
index 00000000..d11f7975
--- /dev/null
+++ b/sys/osxaudio/gstosxaudioelement.h
@@ -0,0 +1,91 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wim.taymans@chello.be>
+ *
+ * gstosxaudioelement.h: 
+ *
+ * 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.
+ */
+
+#ifndef __GST_OSXAUDIO_ELEMENT_H__
+#define __GST_OSXAUDIO_ELEMENT_H__
+
+#include <gst/gst.h>
+#include <CoreAudio/CoreAudio.h>
+#include <pthread.h>
+
+/* debugging category */
+GST_DEBUG_CATEGORY_EXTERN (osxaudio_debug);
+#define GST_CAT_DEFAULT osxaudio_debug
+
+G_BEGIN_DECLS
+
+OSStatus outputAudioDeviceIOProc(AudioDeviceID inDevice, const AudioTimeStamp *inNow, const AudioBufferList *inInputData, const AudioTimeStamp *inInputTime, AudioBufferList *outOutputData, const AudioTimeStamp *inOutputTime, void *inClientData);
+
+OSStatus inputAudioDeviceIOProc(AudioDeviceID inDevice, const AudioTimeStamp *inNow, const AudioBufferList *inInputData, const AudioTimeStamp *inInputTime, AudioBufferList *outOutputData, const AudioTimeStamp *inOutputTime, void *inClientData);
+
+#define GST_TYPE_OSXAUDIOELEMENT \
+  (gst_osxaudioelement_get_type())
+#define GST_OSXAUDIOELEMENT(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OSXAUDIOELEMENT,GstOsxAudioElement))
+#define GST_OSXAUDIOELEMENT_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OSXAUDIOELEMENT,GstOsxAudioElementClass))
+#define GST_IS_OSXAUDIOELEMENT(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OSXAUDIOELEMENT))
+#define GST_IS_OSXAUDIOELEMENT_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OSXAUDIOELEMENT))
+#define GST_OSXAUDIOELEMENT_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_OSXAUDIOELEMENT, GstOsxAudioElementClass))
+
+typedef struct _GstOsxAudioElement GstOsxAudioElement;
+typedef struct _GstOsxAudioElementClass GstOsxAudioElementClass;
+
+/* This is large, but best (maybe it should be even larger).
+ * CoreAudio supposedly has an internal latency in the order of 2ms */
+#define NUM_BUFS 128
+
+struct _GstOsxAudioElement
+{
+  /* yes, we're a gstelement too */
+  GstElement     parent;
+  
+  pthread_mutex_t buffer_mutex; /* mutex covering buffer variables */
+  AudioDeviceID  device_id;
+
+  unsigned char *buffer[NUM_BUFS];
+  unsigned int buffer_len;
+   
+  unsigned int buf_read;
+  unsigned int buf_write;
+  unsigned int buf_read_pos;
+  unsigned int buf_write_pos;
+  int full_buffers;
+  int buffered_bytes;
+
+};
+
+struct _GstOsxAudioElementClass {
+  GstElementClass klass;
+
+  GList		*device_combinations;
+};
+
+GType		gst_osxaudioelement_get_type		(void);
+int read_buffer(GstOsxAudioElement* osxaudio, unsigned char* data);
+int write_buffer(GstOsxAudioElement* osxaudio, unsigned char* data, int len);
+G_END_DECLS
+
+#endif /* __GST_OSXAUDIO_ELEMENT_H__ */
diff --git a/sys/osxaudio/gstosxaudiosink.c b/sys/osxaudio/gstosxaudiosink.c
new file mode 100644
index 00000000..75d7ee2b
--- /dev/null
+++ b/sys/osxaudio/gstosxaudiosink.c
@@ -0,0 +1,230 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wim.taymans@chello.be>
+ *
+ * gstosxaudiosink.c: 
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <CoreAudio/CoreAudio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "gstosxaudiosink.h"
+
+/* elementfactory information */
+static GstElementDetails gst_osxaudiosink_details =
+GST_ELEMENT_DETAILS ("Audio Sink (Mac OS X)",
+    "Sink/Audio",
+    "Output to a Mac OS X CoreAudio Sound Device",
+    "Zaheer Abbas Merali <zaheerabbas at merali.org>");
+
+static void gst_osxaudiosink_base_init (gpointer g_class);
+static void gst_osxaudiosink_class_init (GstOsxAudioSinkClass * klass);
+static void gst_osxaudiosink_init (GstOsxAudioSink * osxaudiosink);
+static void gst_osxaudiosink_dispose (GObject * object);
+
+static GstElementStateReturn gst_osxaudiosink_change_state (GstElement *
+    element);
+
+static void gst_osxaudiosink_chain (GstPad * pad, GstData * _data);
+
+/* OssSink signals and args */
+enum
+{
+  SIGNAL_HANDOFF,
+  LAST_SIGNAL
+};
+
+static GstStaticPadTemplate osxaudiosink_sink_factory =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-raw-float, "
+        "endianness = (int) BYTE_ORDER, "
+        "signed = (boolean) TRUE, "
+        "width = (int) 32, " "rate = (int) 44100, " "channels = (int) 2")
+    );
+
+static GstElementClass *parent_class = NULL;
+static guint gst_osssink_signals[LAST_SIGNAL] = { 0 };
+
+GType
+gst_osxaudiosink_get_type (void)
+{
+  static GType osxaudiosink_type = 0;
+
+  if (!osxaudiosink_type) {
+    static const GTypeInfo osxaudiosink_info = {
+      sizeof (GstOsxAudioSinkClass),
+      gst_osxaudiosink_base_init,
+      NULL,
+      (GClassInitFunc) gst_osxaudiosink_class_init,
+      NULL,
+      NULL,
+      sizeof (GstOsxAudioSink),
+      0,
+      (GInstanceInitFunc) gst_osxaudiosink_init,
+    };
+
+    osxaudiosink_type =
+        g_type_register_static (GST_TYPE_OSXAUDIOELEMENT, "GstOsxAudioSink",
+        &osxaudiosink_info, 0);
+  }
+
+  return osxaudiosink_type;
+}
+
+static void
+gst_osxaudiosink_dispose (GObject * object)
+{
+  GstOsxAudioSink *osxaudiosink = (GstOsxAudioSink *) object;
+
+  /*gst_object_unparent (GST_OBJECT (osxaudiosink->provided_clock)); */
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gst_osxaudiosink_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_set_details (element_class, &gst_osxaudiosink_details);
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&osxaudiosink_sink_factory));
+}
+static void
+gst_osxaudiosink_class_init (GstOsxAudioSinkClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_OSXAUDIOELEMENT);
+
+  gst_osssink_signals[SIGNAL_HANDOFF] =
+      g_signal_new ("handoff", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstOsxAudioSinkClass, handoff), NULL, NULL,
+      g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
+
+  gobject_class->dispose = gst_osxaudiosink_dispose;
+
+  gstelement_class->change_state =
+      GST_DEBUG_FUNCPTR (gst_osxaudiosink_change_state);
+}
+
+static void
+gst_osxaudiosink_init (GstOsxAudioSink * osxaudiosink)
+{
+  osxaudiosink->sinkpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&osxaudiosink_sink_factory), "sink");
+  gst_element_add_pad (GST_ELEMENT (osxaudiosink), osxaudiosink->sinkpad);
+
+  gst_pad_set_chain_function (osxaudiosink->sinkpad, gst_osxaudiosink_chain);
+
+  GST_DEBUG ("initializing osxaudiosink");
+
+  GST_FLAG_SET (osxaudiosink, GST_ELEMENT_THREAD_SUGGESTED);
+  GST_FLAG_SET (osxaudiosink, GST_ELEMENT_EVENT_AWARE);
+}
+
+static void
+gst_osxaudiosink_chain (GstPad * pad, GstData * _data)
+{
+  GstBuffer *buf = GST_BUFFER (_data);
+  GstOsxAudioSink *osxaudiosink;
+  guchar *data;
+  guint to_write;
+  gint amount_written;
+  gint delay;
+
+  /* this has to be an audio buffer */
+  osxaudiosink = GST_OSXAUDIOSINK (gst_pad_get_parent (pad));
+
+  if (GST_IS_EVENT (buf)) {
+    GstEvent *event = GST_EVENT (buf);
+
+    switch (GST_EVENT_TYPE (event)) {
+      case GST_EVENT_EOS:
+        gst_pad_event_default (pad, event);
+        return;
+      case GST_EVENT_DISCONTINUOUS:
+        /* pass-through */
+      default:
+        gst_pad_event_default (pad, event);
+        return;
+    }
+    g_assert_not_reached ();
+  }
+
+  data = GST_BUFFER_DATA (buf);
+  to_write = GST_BUFFER_SIZE (buf);
+  amount_written = 0;
+
+  while (amount_written < to_write) {
+    data += amount_written;
+    to_write -= amount_written;
+    amount_written =
+        write_buffer (GST_OSXAUDIOELEMENT (osxaudiosink), data, to_write);
+  }
+  gst_buffer_unref (buf);
+}
+
+static GstElementStateReturn
+gst_osxaudiosink_change_state (GstElement * element)
+{
+  GstOsxAudioSink *osxaudiosink;
+  OSErr status;
+
+  osxaudiosink = GST_OSXAUDIOSINK (element);
+
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_READY_TO_PAUSED:
+      break;
+    case GST_STATE_PAUSED_TO_PLAYING:
+      status =
+          AudioDeviceStart (GST_OSXAUDIOELEMENT (osxaudiosink)->device_id,
+          outputAudioDeviceIOProc);
+      if (status)
+        GST_DEBUG ("AudioDeviceStart returned %d\n", (int) status);
+      break;
+    case GST_STATE_PLAYING_TO_PAUSED:
+      status =
+          AudioDeviceStop (GST_OSXAUDIOELEMENT (osxaudiosink)->device_id,
+          outputAudioDeviceIOProc);
+      if (status)
+        GST_DEBUG ("AudioDeviceStop returned %d\n", (int) status);
+      break;
+    case GST_STATE_PAUSED_TO_READY:
+      break;
+    default:
+      break;
+  }
+
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
diff --git a/sys/osxaudio/gstosxaudiosink.h b/sys/osxaudio/gstosxaudiosink.h
new file mode 100644
index 00000000..8cffa2be
--- /dev/null
+++ b/sys/osxaudio/gstosxaudiosink.h
@@ -0,0 +1,82 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wtay@chello.be>
+ *
+ * gstosxaudiosink.h: 
+ *
+ * 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.
+ */
+
+
+#ifndef __GST_OSXAUDIOSINK_H__
+#define __GST_OSXAUDIOSINK_H__
+
+
+#include <gst/gst.h>
+
+#include "gstosxaudioelement.h"
+#include <CoreAudio/CoreAudio.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_OSXAUDIOSINK \
+  (gst_osxaudiosink_get_type())
+#define GST_OSXAUDIOSINK(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OSXAUDIOSINK,GstOsxAudioSink))
+#define GST_OSXAUDIOSINK_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OSXAUDIOSINK,GstOsxAudioSinkClass))
+#define GST_IS_OSXAUDIOSINK(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OSXAUDIOSINK))
+#define GST_IS_OSXAUDIOSINK_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OSXAUDIOSINK))
+
+typedef enum {
+  GST_OSXAUDIOSINK_OPEN		= GST_ELEMENT_FLAG_LAST,
+
+  GST_OSXAUDIOSINK_FLAG_LAST	= GST_ELEMENT_FLAG_LAST+2,
+} GstOsxAudioSinkFlags;
+
+typedef struct _GstOsxAudioSink GstOsxAudioSink;
+typedef struct _GstOsxAudioSinkClass GstOsxAudioSinkClass;
+
+struct _GstOsxAudioSink {
+  GstOsxAudioElement	 element;
+
+  GstPad 	*sinkpad;
+
+/*  GstClock 	*provided_clock;
+  GstClock 	*clock;
+  gboolean	 resync;
+  gboolean	 sync;
+  guint64	 handled;
+
+  gboolean 	 mute;
+  guint 	 bufsize;
+  guint 	 chunk_size;*/
+};
+
+struct _GstOsxAudioSinkClass {
+  GstOsxAudioElementClass parent_class;
+
+  /* signals */
+  void (*handoff) (GstElement *element,GstPad *pad);
+};
+
+GType gst_osxaudiosink_get_type(void);
+
+G_END_DECLS
+
+#endif /* __GST_OSXAUDIOSINK_H__ */
diff --git a/sys/osxaudio/gstosxaudiosrc.c b/sys/osxaudio/gstosxaudiosrc.c
new file mode 100644
index 00000000..41a2a36f
--- /dev/null
+++ b/sys/osxaudio/gstosxaudiosrc.c
@@ -0,0 +1,216 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wtay@chello.be>
+ *
+ * gstosxaudiosrc.c: 
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <CoreAudio/CoreAudio.h>
+
+#include <gstosxaudiosrc.h>
+#include <gstosxaudioelement.h>
+
+/* elementfactory information */
+static GstElementDetails gst_osxaudiosrc_details =
+GST_ELEMENT_DETAILS ("Audio Source (Mac OS X)",
+    "Source/Audio",
+    "Read from the sound card",
+    "Zaheer Abbas Merali <zaheerabbas at merali.org>");
+
+
+/* Osxaudiosrc signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+static GstStaticPadTemplate osxaudiosrc_src_factory =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-raw-float, "
+        "endianness = (int) BYTE_ORDER, "
+        "signed = (boolean) TRUE , "
+        "width = (int) 32, " "rate = (int) 44100, " "channels = (int) 2")
+    );
+
+static void gst_osxaudiosrc_base_init (gpointer g_class);
+static void gst_osxaudiosrc_class_init (GstOsxAudioSrcClass * klass);
+static void gst_osxaudiosrc_init (GstOsxAudioSrc * osxaudiosrc);
+static void gst_osxaudiosrc_dispose (GObject * object);
+
+static GstElementStateReturn gst_osxaudiosrc_change_state (GstElement *
+    element);
+
+static GstData *gst_osxaudiosrc_get (GstPad * pad);
+
+static GstElementClass *parent_class = NULL;
+
+/*static guint gst_osxaudiosrc_signals[LAST_SIGNAL] = { 0 }; */
+
+GType
+gst_osxaudiosrc_get_type (void)
+{
+  static GType osxaudiosrc_type = 0;
+
+  if (!osxaudiosrc_type) {
+    static const GTypeInfo osxaudiosrc_info = {
+      sizeof (GstOsxAudioSrcClass),
+      gst_osxaudiosrc_base_init,
+      NULL,
+      (GClassInitFunc) gst_osxaudiosrc_class_init,
+      NULL,
+      NULL,
+      sizeof (GstOsxAudioSrc),
+      0,
+      (GInstanceInitFunc) gst_osxaudiosrc_init,
+    };
+
+    osxaudiosrc_type =
+        g_type_register_static (GST_TYPE_OSXAUDIOELEMENT, "GstOsxAudioSrc",
+        &osxaudiosrc_info, 0);
+  }
+  return osxaudiosrc_type;
+}
+
+static void
+gst_osxaudiosrc_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_set_details (element_class, &gst_osxaudiosrc_details);
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&osxaudiosrc_src_factory));
+}
+static void
+gst_osxaudiosrc_class_init (GstOsxAudioSrcClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+
+  parent_class = g_type_class_ref (GST_TYPE_OSXAUDIOELEMENT);
+
+  gobject_class->dispose = gst_osxaudiosrc_dispose;
+
+  gstelement_class->change_state = gst_osxaudiosrc_change_state;
+
+}
+
+static void
+gst_osxaudiosrc_init (GstOsxAudioSrc * osxaudiosrc)
+{
+  osxaudiosrc->srcpad =
+      gst_pad_new_from_template (gst_static_pad_template_get
+      (&osxaudiosrc_src_factory), "src");
+  gst_pad_set_get_function (osxaudiosrc->srcpad, gst_osxaudiosrc_get);
+
+  gst_element_add_pad (GST_ELEMENT (osxaudiosrc), osxaudiosrc->srcpad);
+
+}
+
+static void
+gst_osxaudiosrc_dispose (GObject * object)
+{
+  GstOsxAudioSrc *osxaudiosrc = (GstOsxAudioSrc *) object;
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static GstData *
+gst_osxaudiosrc_get (GstPad * pad)
+{
+  GstOsxAudioSrc *src;
+  GstBuffer *buf;
+  glong readbytes;
+
+  src = GST_OSXAUDIOSRC (gst_pad_get_parent (pad));
+
+  buf = gst_buffer_new_and_alloc ((GST_OSXAUDIOELEMENT (src))->buffer_len);
+
+  readbytes = read_buffer (src, (char *) GST_BUFFER_DATA (buf));
+
+  if (readbytes < 0) {
+    gst_buffer_unref (buf);
+    GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
+    return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
+  }
+
+  if (readbytes == 0) {
+    gst_buffer_unref (buf);
+    return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
+  }
+
+  GST_BUFFER_SIZE (buf) = readbytes;
+  GST_BUFFER_OFFSET (buf) = src->curoffset;
+
+  src->curoffset += readbytes;
+
+  GST_DEBUG ("pushed buffer from soundcard of %ld bytes", readbytes);
+
+  return GST_DATA (buf);
+}
+
+static GstElementStateReturn
+gst_osxaudiosrc_change_state (GstElement * element)
+{
+  GstOsxAudioSrc *osxaudiosrc = GST_OSXAUDIOSRC (element);
+  OSErr status;
+
+  GST_DEBUG ("osxaudiosrc: state change");
+
+  switch (GST_STATE_TRANSITION (element)) {
+    case GST_STATE_READY_TO_PAUSED:
+      osxaudiosrc->curoffset = 0;
+      break;
+    case GST_STATE_PAUSED_TO_PLAYING:
+      status =
+          AudioDeviceStart (GST_OSXAUDIOELEMENT (osxaudiosrc)->device_id,
+          inputAudioDeviceIOProc);
+      if (status)
+        GST_DEBUG ("AudioDeviceStart returned %d\n", (int) status);
+      break;
+    case GST_STATE_PLAYING_TO_PAUSED:
+      status =
+          AudioDeviceStop (GST_OSXAUDIOELEMENT (osxaudiosrc)->device_id,
+          inputAudioDeviceIOProc);
+      if (status)
+        GST_DEBUG ("AudioDeviceStop returned %d\n", (int) status);
+      break;
+    case GST_STATE_PAUSED_TO_READY:
+      break;
+    default:
+      break;
+  }
+
+  if (GST_ELEMENT_CLASS (parent_class)->change_state)
+    return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+
+  return GST_STATE_SUCCESS;
+}
diff --git a/sys/osxaudio/gstosxaudiosrc.h b/sys/osxaudio/gstosxaudiosrc.h
new file mode 100644
index 00000000..bef9decf
--- /dev/null
+++ b/sys/osxaudio/gstosxaudiosrc.h
@@ -0,0 +1,75 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wtay@chello.be>
+ *
+ * gstosxaudiosrc.h: 
+ *
+ * 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.
+ */
+
+
+#ifndef __GST_OSXAUDIOSRC_H__
+#define __GST_OSXAUDIOSRC_H__
+
+
+#include <gst/gst.h>
+#include "gstosxaudioelement.h"
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_OSXAUDIOSRC \
+  (gst_osxaudiosrc_get_type())
+#define GST_OSXAUDIOSRC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_OSXAUDIOSRC,GstOsxAudioSrc))
+#define GST_OSXAUDIOSRC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_OSXAUDIOSRC,GstOsxAudioSrcClass))
+#define GST_IS_OSXAUDIOSRC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_OSXAUDIOSRC))
+#define GST_IS_OSXAUDIOSRC_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OSXAUDIOSRC))
+
+typedef enum {
+  GST_OSXAUDIOSRC_OPEN		= GST_ELEMENT_FLAG_LAST,
+
+  GST_OSXAUDIOSRC_FLAG_LAST	= GST_ELEMENT_FLAG_LAST+2,
+} GstOsxAudioSrcFlags;
+
+typedef struct _GstOsxAudioSrc GstOsxAudioSrc;
+typedef struct _GstOsxAudioSrcClass GstOsxAudioSrcClass;
+
+struct _GstOsxAudioSrc {
+  GstOsxAudioElement  element;
+
+  /* pads */
+  GstPad 	*srcpad;
+
+  gboolean	 need_eos; /* Do we need to emit an EOS? */
+  
+  /* blocking */
+  gulong 	 curoffset;
+  gulong 	 buffersize;
+
+};
+
+struct _GstOsxAudioSrcClass {
+  GstOsxAudioElementClass parent_class;
+};
+
+GType gst_osxaudiosrc_get_type(void);
+
+G_END_DECLS
+
+#endif /* __GST_OSXAUDIOSRC_H__ */