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, 230 insertions, 0 deletions

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;
+}