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:

1 files changed, 91 insertions, 0 deletions

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__ */