osxaudio: add support for iOS using the RemoteIO AudioUnit

configure.ac

@@ -444,9 +444,19 @@ AG_GST_CHECK_FEATURE(SUNAUDIO, [Sun Audio], sunaudio, [
 
 dnl *** OSX Audio ***
 translit(dnm, m, l) AM_CONDITIONAL(USE_OSX_AUDIO, true)
+have_ios="no"
 AG_GST_CHECK_FEATURE(OSX_AUDIO, [OSX audio], osxaudio, [
-  AC_CHECK_HEADER(CoreAudio/CoreAudio.h, HAVE_OSX_AUDIO="yes", HAVE_OSX_AUDIO="no")
+  AC_CHECK_HEADER(CoreAudio/CoreAudio.h,
+    HAVE_OSX_AUDIO="yes",
+    dnl *** Check for the iOS headers ***
+    [AC_CHECK_HEADER(CoreAudio/CoreAudioTypes.h,
+      [HAVE_OSX_AUDIO="YES";have_ios="yes"], HAVE_OSX_AUDIO="no"
+    )])
 ])
+if test "x$have_ios" = "xyes"; then
+  AC_DEFINE(HAVE_IOS, 1, [building for iOS platofrm])
+fi
+AM_CONDITIONAL(HAVE_IOS, test "x$have_ios" = "xyes")
 
 dnl *** OS X video ***
 translit(dnm, m, l) AM_CONDITIONAL(USE_OSX_VIDEO, true)

sys/osxaudio/Makefile.am

@@ -16,8 +16,14 @@ libgstosxaudio_la_LIBADD = 			  \
     $(GST_PLUGINS_BASE_LIBS)          \
     $(GST_BASE_LIBS)                  \
     $(GST_LIBS)
-libgstosxaudio_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -Wl,-framework -Wl,CoreAudio -Wl,-framework -Wl,AudioUnit -Wl,-framework -Wl,AudioToolbox -Wl,-framework -Wl,CoreServices
-libgstosxaudio_la_LIBTOOLFLAGS = --tag=disable-static
+
+libgstosxaudio_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) -Wl,-framework,CoreAudio  -Wl,-framework,AudioToolbox
+
+if !HAVE_IOS
+libgstosxaudio_la_LDFLAGS += -Wl,-framework,AudioUnit -Wl,-framework,CoreServices
+endif
+
+libgstosxaudio_la_LIBTOOLFLAGS = --tag=disable-static --tag=CC
 
 noinst_HEADERS = gstosxaudiosink.h	  \
                  gstosxaudioelement.h \
@@ -25,7 +31,8 @@ noinst_HEADERS = gstosxaudiosink.h	  \
                  gstosxaudiosrc.h     \
                  gstosxcoreaudiocommon.h     \
                  gstosxcoreaudio.h \
-                 gstosxcoreaudiohal.c
+                 gstosxcoreaudiohal.c \
+                 gstosxcoreaudioremoteio.c
 
 
 

sys/osxaudio/gstosxaudioelement.h

@@ -49,8 +49,16 @@
 #ifndef __GST_OSX_AUDIO_ELEMENT_H__
 #define __GST_OSX_AUDIO_ELEMENT_H__
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <gst/gst.h>
+#ifdef HAVE_IOS
+#include <CoreAudio/CoreAudioTypes.h>
+#else
 #include <CoreAudio/CoreAudio.h>
+#endif
 #include <AudioUnit/AudioUnit.h>
 
 G_BEGIN_DECLS

sys/osxaudio/gstosxaudiosink.c

@@ -210,9 +210,11 @@ gst_osx_audio_sink_class_init (GstOsxAudioSinkClass * klass)
   gobject_class->set_property = gst_osx_audio_sink_set_property;
   gobject_class->get_property = gst_osx_audio_sink_get_property;
 
+#ifndef HAVE_IOS
   g_object_class_install_property (gobject_class, ARG_DEVICE,
       g_param_spec_int ("device", "Device ID", "Device ID of output device",
           0, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+#endif
 
   g_object_class_install_property (gobject_class, ARG_VOLUME,
       g_param_spec_double ("volume", "Volume", "Volume of this stream",
@@ -248,9 +250,11 @@ gst_osx_audio_sink_set_property (GObject * object, guint prop_id,
   GstOsxAudioSink *sink = GST_OSX_AUDIO_SINK (object);
 
   switch (prop_id) {
+#ifndef HAVE_IOS
     case ARG_DEVICE:
       sink->device_id = g_value_get_int (value);
       break;
+#endif
     case ARG_VOLUME:
       sink->volume = g_value_get_double (value);
       gst_osx_audio_sink_set_volume (sink);
@@ -267,9 +271,11 @@ gst_osx_audio_sink_get_property (GObject * object, guint prop_id,
 {
   GstOsxAudioSink *sink = GST_OSX_AUDIO_SINK (object);
   switch (prop_id) {
+#ifndef HAVE_IOS
     case ARG_DEVICE:
       g_value_set_int (value, sink->device_id);
       break;
+#endif
     case ARG_VOLUME:
       g_value_set_double (value, sink->volume);
       break;

sys/osxaudio/gstosxcoreaudio.c

@@ -30,7 +30,11 @@ GST_DEBUG_CATEGORY_STATIC (osx_audio_debug);
 
 G_DEFINE_TYPE (GstCoreAudio, gst_core_audio, G_TYPE_OBJECT);
 
+#ifdef HAVE_IOS
+#include "gstosxcoreaudioremoteio.c"
+#else
 #include "gstosxcoreaudiohal.c"
+#endif
 
 
 static void

sys/osxaudio/gstosxcoreaudioremoteio.c

@@ -0,0 +1,127 @@
+/*
+ * GStreamer
+ * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
+ *   Authors: Andoni Morales Alastruey <amorales@fluendo.com>
+ *
+ * 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.
+ *
+ */
+
+#import <AudioUnit/AUComponent.h>
+
+static gboolean
+gst_core_audio_open_impl (GstCoreAudio * core_audio)
+{
+  return gst_core_audio_open_device (core_audio, kAudioUnitSubType_RemoteIO,
+      "RemoteIO");
+}
+
+static gboolean
+gst_core_audio_start_processing_impl (GstCoreAudio * core_audio)
+{
+  return gst_core_audio_io_proc_start (core_audio);
+}
+
+static gboolean
+gst_core_audio_pause_processing_impl (GstCoreAudio * core_audio)
+{
+  GST_DEBUG_OBJECT (core_audio,
+      "osx ring buffer pause ioproc: %p device_id %lu",
+      core_audio->element->io_proc, (gulong) core_audio->device_id);
+
+  if (core_audio->io_proc_active) {
+    /* CoreAudio isn't threadsafe enough to do this here;
+     * we must deactivate the render callback elsewhere. See:
+     * http://lists.apple.com/archives/Coreaudio-api/2006/Mar/msg00010.html
+     */
+    core_audio->io_proc_needs_deactivation = TRUE;
+  }
+  return TRUE;
+}
+
+static gboolean
+gst_core_audio_stop_processing_impl (GstCoreAudio * core_audio)
+{
+  gst_core_audio_io_proc_stop (core_audio);
+  return TRUE;
+}
+
+static gboolean
+gst_core_audio_get_samples_and_latency_impl (GstCoreAudio * core_audio,
+    gdouble rate, guint * samples, gdouble * latency)
+{
+  OSStatus status;
+  UInt32 size;
+
+  status = AudioUnitGetProperty (core_audio->audiounit, kAudioUnitProperty_Latency, kAudioUnitScope_Global, 0,  /* N/A for global */
+      latency, &size);
+
+  if (status) {
+    GST_WARNING_OBJECT (core_audio, "Failed to get latency: %"
+        GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+    *samples = 0;
+    return FALSE;
+  }
+
+  *samples = *latency * rate;
+  return TRUE;
+}
+
+static gboolean
+gst_core_audio_initialize_impl (GstCoreAudio * core_audio,
+    AudioStreamBasicDescription format, GstCaps * caps,
+    gboolean is_passthrough, guint32 * frame_size)
+{
+  core_audio->is_passthrough = is_passthrough;
+  core_audio->stream_idx = 0;
+  if (!gst_core_audio_set_format (core_audio, format))
+    return FALSE;
+
+  /* FIXME: Use kAudioSessionProperty_CurrentHardwareSampleRate and
+   * kAudioSessionProperty_CurrentHardwareIOBufferDuration with property
+   * listeners to detect changes in screen locks.
+   * For now use the maximum value */
+  *frame_size = 4196;
+
+  GST_DEBUG_OBJECT (core_audio, "osxbuf ring buffer acquired");
+  return TRUE;
+}
+
+AudioChannelLayout *
+gst_core_audio_audio_device_get_channel_layout (AudioDeviceID device_id)
+{
+  return NULL;
+}
+
+static gboolean
+gst_core_audio_select_device_impl (AudioDeviceID * device_id)
+{
+  /* No device selection in iOS */
+  return TRUE;
+}
+
+static gboolean
+gst_core_audio_select_source_device_impl (AudioDeviceID * device_id)
+{
+  return TRUE;
+}
+
+static gboolean
+gst_core_audio_audio_device_is_spdif_avail_impl (AudioDeviceID device_id)
+{
+  /* No SPDIF in iOS */
+  return FALSE;
+}