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, 216 insertions, 0 deletions

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;
+}