osxaudiosink: Add support for SPDIF output

A big refactoring to allow passthrough AC3/DTS over SPDIF.
Several random cleanups and minor fixes.

sys/osxaudio/Makefile.am

@@ -20,7 +20,8 @@ libgstosxaudio_la_LIBTOOLFLAGS = --tag=disable-static
 noinst_HEADERS = gstosxaudiosink.h	  \
                  gstosxaudioelement.h \
                  gstosxringbuffer.h	  \
-                 gstosxaudiosrc.h
+                 gstosxaudiosrc.h     \
+                 gstosxcoreaudio.h
 
 
 

sys/osxaudio/gstosxaudiosink.c

@@ -2,6 +2,7 @@
  * GStreamer
  * Copyright (C) 2005,2006 Zaheer Abbas Merali <zaheerabbas at merali dot org>
  * Copyright (C) 2007,2008 Pioneers of the Inevitable <songbird@songbirdnest.com>
+ * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -71,9 +72,13 @@
 #include "gstosxaudiosink.h"
 #include "gstosxaudioelement.h"
 
+#include <gst/audio/gstaudioiec61937.h>
+
 GST_DEBUG_CATEGORY_STATIC (osx_audiosink_debug);
 #define GST_CAT_DEFAULT osx_audiosink_debug
 
+#include "gstosxcoreaudio.h"
+
 /* Filter signals and args */
 enum
 {
@@ -126,7 +131,9 @@ static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
         "signed = (boolean) { TRUE }, "
         "width = (int) 8, "
         "depth = (int) 8, "
-        "rate = (int) [1, MAX], " "channels = (int) [1, MAX]")
+        "rate = (int) [1, MAX], " "channels = (int) [1, MAX];"
+        "audio/x-ac3, framed = (boolean) true;"
+        "audio/x-dts, framed = (boolean) true")
     );
 
 static void gst_osx_audio_sink_set_property (GObject * object, guint prop_id,
@@ -134,11 +141,17 @@ static void gst_osx_audio_sink_set_property (GObject * object, guint prop_id,
 static void gst_osx_audio_sink_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);
 
+static gboolean gst_osx_audio_sink_stop (GstBaseSink * base);
+static GstCaps *gst_osx_audio_sink_getcaps (GstBaseSink * base);
+static gboolean gst_osx_audio_sink_acceptcaps (GstPad * pad, GstCaps * caps);
+
+static GstBuffer *gst_osx_audio_sink_sink_payload (GstBaseAudioSink * sink,
+    GstBuffer * buf);
 static GstRingBuffer *gst_osx_audio_sink_create_ringbuffer (GstBaseAudioSink *
     sink);
 static void gst_osx_audio_sink_osxelement_init (gpointer g_iface,
     gpointer iface_data);
-static void gst_osx_audio_sink_select_device (GstOsxAudioSink * osxsink);
+static gboolean gst_osx_audio_sink_select_device (GstOsxAudioSink * osxsink);
 static void gst_osx_audio_sink_set_volume (GstOsxAudioSink * sink);
 
 static OSStatus gst_osx_audio_sink_io_proc (GstOsxRingBuffer * buf,
@@ -205,8 +218,13 @@ gst_osx_audio_sink_class_init (GstOsxAudioSinkClass * klass)
       g_param_spec_double ("volume", "Volume", "Volume of this stream",
           0, 1.0, 1.0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 
+  gstbasesink_class->get_caps = GST_DEBUG_FUNCPTR (gst_osx_audio_sink_getcaps);
+  gstbasesink_class->stop = GST_DEBUG_FUNCPTR (gst_osx_audio_sink_stop);
+
   gstbaseaudiosink_class->create_ringbuffer =
       GST_DEBUG_FUNCPTR (gst_osx_audio_sink_create_ringbuffer);
+  gstbaseaudiosink_class->payload =
+      GST_DEBUG_FUNCPTR (gst_osx_audio_sink_sink_payload);
 }
 
 static void
@@ -215,7 +233,12 @@ gst_osx_audio_sink_init (GstOsxAudioSink * sink, GstOsxAudioSinkClass * gclass)
   GST_DEBUG ("Initialising object");
 
   sink->device_id = kAudioDeviceUnknown;
+  sink->cached_caps = NULL;
+
   sink->volume = DEFAULT_VOLUME;
+
+  gst_pad_set_acceptcaps_function (GST_BASE_SINK (sink)->sinkpad,
+      GST_DEBUG_FUNCPTR (gst_osx_audio_sink_acceptcaps));
 }
 
 static void
@@ -256,6 +279,178 @@ gst_osx_audio_sink_get_property (GObject * object, guint prop_id,
   }
 }
 
+static gboolean
+gst_osx_audio_sink_stop (GstBaseSink * base)
+{
+  GstOsxAudioSink *sink = GST_OSX_AUDIO_SINK (base);
+
+  if (sink->cached_caps) {
+    gst_caps_unref (sink->cached_caps);
+    sink->cached_caps = NULL;
+  }
+
+  return GST_CALL_PARENT_WITH_DEFAULT (GST_BASE_SINK_CLASS, stop, (base), TRUE);
+}
+
+static GstCaps *
+gst_osx_audio_sink_getcaps (GstBaseSink * base)
+{
+  GstOsxAudioSink *sink = GST_OSX_AUDIO_SINK (base);
+  GstOsxRingBuffer *osxbuf;
+  GstElementClass *element_class;
+  GstPadTemplate *pad_template;
+  GstCaps *caps;
+  gchar *caps_string = NULL;
+
+  osxbuf = GST_OSX_RING_BUFFER (GST_BASE_AUDIO_SINK (sink)->ringbuffer);
+
+  if (!osxbuf) {
+    GST_DEBUG_OBJECT (sink, "device not open, using template caps");
+    return NULL;                /* base class will get template caps for us */
+  }
+
+  if (sink->cached_caps) {
+    caps_string = gst_caps_to_string (sink->cached_caps);
+    GST_DEBUG_OBJECT (sink, "using cached caps: %s", caps_string);
+    g_free (caps_string);
+    return gst_caps_ref (sink->cached_caps);
+  }
+
+  element_class = GST_ELEMENT_GET_CLASS (sink);
+  pad_template = gst_element_class_get_pad_template (element_class, "sink");
+  g_return_val_if_fail (pad_template != NULL, NULL);
+
+  caps = gst_caps_copy (gst_pad_template_get_caps (pad_template));
+
+  if (caps) {
+    if (!osxbuf->is_spdif_capable) {
+      GstCaps *sub_caps, *orig_caps = caps;
+
+      sub_caps = gst_caps_from_string ("audio/x-ac3;audio/x-dts");
+      caps = gst_caps_subtract (orig_caps, sub_caps);
+      gst_caps_unref (sub_caps);
+      gst_caps_unref (orig_caps);
+    }
+    sink->cached_caps = gst_caps_ref (caps);
+    caps_string = gst_caps_to_string (caps);
+    GST_DEBUG_OBJECT (sink, "cached caps: %s", caps_string);
+    g_free (caps_string);
+  }
+
+  return caps;
+}
+
+static gboolean
+gst_osx_audio_sink_acceptcaps (GstPad * pad, GstCaps * caps)
+{
+  GstOsxAudioSink *sink = GST_OSX_AUDIO_SINK (gst_pad_get_parent_element (pad));
+  GstOsxRingBuffer *osxbuf;
+  GstCaps *pad_caps;
+  GstStructure *st;
+  gboolean ret = FALSE;
+  GstRingBufferSpec spec = { 0 };
+  gchar *caps_string = NULL;
+
+  osxbuf = GST_OSX_RING_BUFFER (GST_BASE_AUDIO_SINK (sink)->ringbuffer);
+
+  caps_string = gst_caps_to_string (caps);
+  GST_DEBUG_OBJECT (sink, "acceptcaps called with %s", caps_string);
+  g_free (caps_string);
+
+  pad_caps = gst_pad_get_caps_reffed (pad);
+  if (pad_caps) {
+    gboolean cret = gst_caps_can_intersect (pad_caps, caps);
+    gst_caps_unref (pad_caps);
+    if (!cret)
+      goto done;
+  }
+
+  /* If we've not got fixed caps, creating a stream might fail,
+   * so let's just return from here with default acceptcaps
+   * behaviour */
+  if (!gst_caps_is_fixed (caps))
+    goto done;
+
+  /* parse helper expects this set, so avoid nasty warning
+   * will be set properly later on anyway  */
+  spec.latency_time = GST_SECOND;
+  if (!gst_ring_buffer_parse_caps (&spec, caps))
+    goto done;
+
+  /* Make sure input is framed and can be payloaded */
+  switch (spec.type) {
+    case GST_BUFTYPE_AC3:
+    {
+      gboolean framed = FALSE;
+
+      if (!osxbuf->is_spdif_capable)
+        goto done;
+
+      st = gst_caps_get_structure (caps, 0);
+
+      gst_structure_get_boolean (st, "framed", &framed);
+      if (!framed || gst_audio_iec61937_frame_size (&spec) <= 0)
+        goto done;
+      break;
+    }
+    case GST_BUFTYPE_DTS:
+    {
+      gboolean parsed = FALSE;
+
+      if (!osxbuf->is_spdif_capable)
+        goto done;
+
+      st = gst_caps_get_structure (caps, 0);
+
+      gst_structure_get_boolean (st, "parsed", &parsed);
+      if (!parsed || gst_audio_iec61937_frame_size (&spec) <= 0)
+        goto done;
+      break;
+    }
+    default:
+      break;
+  }
+  ret = TRUE;
+
+done:
+  gst_object_unref (sink);
+  return ret;
+}
+
+static GstBuffer *
+gst_osx_audio_sink_sink_payload (GstBaseAudioSink * sink, GstBuffer * buf)
+{
+  GstOsxAudioSink *osxsink;
+
+  osxsink = GST_OSX_AUDIO_SINK (sink);
+
+  if (RINGBUFFER_IS_SPDIF (sink->ringbuffer->spec.type)) {
+    gint framesize = gst_audio_iec61937_frame_size (&sink->ringbuffer->spec);
+    GstBuffer *out;
+
+    if (framesize <= 0)
+      return NULL;
+
+    out = gst_buffer_new_and_alloc (framesize);
+
+    if (!gst_audio_iec61937_payload (GST_BUFFER_DATA (buf),
+            GST_BUFFER_SIZE (buf), GST_BUFFER_DATA (out),
+            GST_BUFFER_SIZE (out), &sink->ringbuffer->spec)) {
+      gst_buffer_unref (out);
+      return NULL;
+    }
+
+    gst_buffer_copy_metadata (out, buf, GST_BUFFER_COPY_ALL);
+
+    /* Fix endianness */
+    swab ((gchar *) GST_BUFFER_DATA (buf),
+        (gchar *) GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
+    return out;
+  } else {
+    return gst_buffer_ref (buf);
+  }
+}
+
 static GstRingBuffer *
 gst_osx_audio_sink_create_ringbuffer (GstBaseAudioSink * sink)
 {
@@ -264,11 +459,13 @@ gst_osx_audio_sink_create_ringbuffer (GstBaseAudioSink * sink)
 
   osxsink = GST_OSX_AUDIO_SINK (sink);
 
-  gst_osx_audio_sink_select_device (osxsink);
+  if (!gst_osx_audio_sink_select_device (osxsink)) {
+    return NULL;
+  }
 
   GST_DEBUG ("Creating ringbuffer");
   ringbuffer = g_object_new (GST_TYPE_OSX_RING_BUFFER, NULL);
-  GST_DEBUG ("osx sink 0x%p element 0x%p  ioproc 0x%p", osxsink,
+  GST_DEBUG ("osx sink %p element %p  ioproc %p", osxsink,
       GST_OSX_AUDIO_ELEMENT_GET_INTERFACE (osxsink),
       (void *) gst_osx_audio_sink_io_proc);
 
@@ -280,10 +477,10 @@ gst_osx_audio_sink_create_ringbuffer (GstBaseAudioSink * sink)
   return GST_RING_BUFFER (ringbuffer);
 }
 
-/* HALOutput AudioUnit will request fairly arbitrarily-sized chunks of data,
+/* HALOutput AudioUnit will request fairly arbitrarily-sized chunks
- * not of a fixed size. So, we keep track of where in the current ringbuffer
+ * of data, not of a fixed size. So, we keep track of where in
- * segment we are, and only advance the segment once we've read the whole
+ * the current ringbuffer segment we are, and only advance the segment
- * thing */
+ * once we've read the whole thing */
 static OSStatus
 gst_osx_audio_sink_io_proc (GstOsxRingBuffer * buf,
     AudioUnitRenderActionFlags * ioActionFlags,
@@ -293,7 +490,8 @@ gst_osx_audio_sink_io_proc (GstOsxRingBuffer * buf,
   guint8 *readptr;
   gint readseg;
   gint len;
-  gint remaining = bufferList->mBuffers[0].mDataByteSize;
+  gint stream_idx = buf->stream_idx;
+  gint remaining = bufferList->mBuffers[stream_idx].mDataByteSize;
   gint offset = 0;
 
   while (remaining) {
@@ -306,7 +504,7 @@ gst_osx_audio_sink_io_proc (GstOsxRingBuffer * buf,
     if (len > remaining)
       len = remaining;
 
-    memcpy ((char *) bufferList->mBuffers[0].mData + offset,
+    memcpy ((char *) bufferList->mBuffers[stream_idx].mData + offset,
         readptr + buf->segoffset, len);
 
     buf->segoffset += len;
@@ -344,34 +542,95 @@ gst_osx_audio_sink_set_volume (GstOsxAudioSink * sink)
       kAudioUnitScope_Global, 0, (float) sink->volume, 0);
 }
 
-static void
+static inline void
-gst_osx_audio_sink_select_device (GstOsxAudioSink * osxsink)
+_dump_channel_layout (AudioChannelLayout * channel_layout)
 {
-  OSStatus status;
+  UInt32 i;
-  UInt32 propertySize;
 
-  if (osxsink->device_id == kAudioDeviceUnknown) {
+  GST_DEBUG ("mChannelLayoutTag: 0x%lx",
-    /* If no specific device has been selected by the user, then pick the
+      (unsigned long) channel_layout->mChannelLayoutTag);
-     * default device */
+  GST_DEBUG ("mChannelBitmap: 0x%lx",
-    GST_DEBUG_OBJECT (osxsink, "Selecting device for OSXAudioSink");
+      (unsigned long) channel_layout->mChannelBitmap);
-    propertySize = sizeof (osxsink->device_id);
+  GST_DEBUG ("mNumberChannelDescriptions: %lu",
-    status =
+      (unsigned long) channel_layout->mNumberChannelDescriptions);
-        AudioHardwareGetProperty (kAudioHardwarePropertyDefaultOutputDevice,
+  for (i = 0; i < channel_layout->mNumberChannelDescriptions; i++) {
-        &propertySize, &osxsink->device_id);
+    AudioChannelDescription *channel_desc =
-
+        &channel_layout->mChannelDescriptions[i];
-    if (status) {
+    GST_DEBUG ("  mChannelLabel: 0x%lx mChannelFlags: 0x%lx "
-      GST_WARNING_OBJECT (osxsink,
+        "mCoordinates[0]: %f mCoordinates[1]: %f "
-          "AudioHardwareGetProperty returned %d", (int) status);
+        "mCoordinates[2]: %f",
-    } else {
+        (unsigned long) channel_desc->mChannelLabel,
-      GST_DEBUG_OBJECT (osxsink, "AudioHardwareGetProperty returned 0");
+        (unsigned long) channel_desc->mChannelFlags,
-    }
+        channel_desc->mCoordinates[0], channel_desc->mCoordinates[1],
-
+        channel_desc->mCoordinates[2]);
-    if (osxsink->device_id == kAudioDeviceUnknown) {
-      GST_WARNING_OBJECT (osxsink,
-          "AudioHardwareGetProperty: device_id is kAudioDeviceUnknown");
-    }
-
-    GST_DEBUG_OBJECT (osxsink, "AudioHardwareGetProperty: device_id is %lu",
-        (long) osxsink->device_id);
   }
 }
+
+static gboolean
+gst_osx_audio_sink_select_device (GstOsxAudioSink * osxsink)
+{
+  AudioDeviceID *devices = NULL;
+  AudioDeviceID default_device_id = 0;
+  AudioChannelLayout *channel_layout;
+  gint i, ndevices = 0;
+  gboolean res = FALSE;
+
+  devices = _audio_system_get_devices (&ndevices);
+
+  if (ndevices < 1) {
+    GST_ERROR_OBJECT (osxsink, "no audio output devices found");
+    goto done;
+  }
+
+  GST_DEBUG_OBJECT (osxsink, "found %d audio device(s)", ndevices);
+
+  for (i = 0; i < ndevices; i++) {
+    gchar *device_name;
+
+    if ((device_name = _audio_device_get_name (devices[i]))) {
+      if (!_audio_device_has_output (devices[i])) {
+        GST_DEBUG_OBJECT (osxsink, "Input Device ID: %u Name: %s",
+            (unsigned) devices[i], device_name);
+      } else {
+        GST_DEBUG_OBJECT (osxsink, "Output Device ID: %u Name: %s",
+            (unsigned) devices[i], device_name);
+
+        channel_layout = _audio_device_get_channel_layout (devices[i]);
+        if (channel_layout) {
+          _dump_channel_layout (channel_layout);
+          g_free (channel_layout);
+        }
+      }
+
+      g_free (device_name);
+    }
+  }
+
+  /* Find the ID of the default output device */
+  default_device_id = _audio_system_get_default_output ();
+
+  /* Here we decide if selected device is valid or autoselect
+   * the default one when required */
+  if (osxsink->device_id == kAudioDeviceUnknown) {
+    if (default_device_id != kAudioDeviceUnknown) {
+      osxsink->device_id = default_device_id;
+      res = TRUE;
+    }
+  } else {
+    for (i = 0; i < ndevices; i++) {
+      if (osxsink->device_id == devices[i]) {
+        res = TRUE;
+      }
+    }
+
+    if (res && !_audio_device_is_alive (osxsink->device_id)) {
+      GST_ERROR_OBJECT (osxsink, "Requested device not usable");
+      res = FALSE;
+    }
+  }
+
+done:
+  g_free (devices);
+
+  return res;
+}

sys/osxaudio/gstosxaudiosink.h

@@ -2,6 +2,7 @@
  * GStreamer
  * Copyright (C) 2005-2006 Zaheer Abbas Merali <zaheerabbas at merali dot org>
  * Copyright (C) 2007 Pioneers of the Inevitable <songbird@songbirdnest.com>
+ * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -72,6 +73,7 @@ struct _GstOsxAudioSink
   AudioDeviceID device_id;
   AudioUnit audiounit;
   double volume;
+  GstCaps *cached_caps;
 };
 
 struct _GstOsxAudioSinkClass
@@ -84,3 +86,4 @@ GType gst_osx_audio_sink_get_type (void);
 G_END_DECLS
 
 #endif /* __GST_OSXAUDIOSINK_H__ */
+

sys/osxaudio/gstosxcoreaudio.h

@@ -0,0 +1,576 @@
+/*
+ * GStreamer
+ * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * 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.
+ *
+ * The development of this code was made possible due to the involvement of
+ * Pioneers of the Inevitable, the creators of the Songbird Music player
+ *
+ */
+
+#define CORE_AUDIO_FORMAT "FormatID: %" GST_FOURCC_FORMAT " rate: %f flags: 0x%x BytesPerPacket: %u FramesPerPacket: %u BytesPerFrame: %u ChannelsPerFrame: %u BitsPerChannel: %u"
+#define CORE_AUDIO_FORMAT_ARGS(f) GST_FOURCC_ARGS((f).mFormatID),(f).mSampleRate,(unsigned)(f).mFormatFlags,(unsigned)(f).mBytesPerPacket,(unsigned)(f).mFramesPerPacket,(unsigned)(f).mBytesPerFrame,(unsigned)(f).mChannelsPerFrame,(unsigned)(f).mBitsPerChannel
+
+#define CORE_AUDIO_FORMAT_IS_SPDIF(f) ((f).mFormat.mFormatID == 'IAC3' || (f).mFormat.mFormatID == 'iac3' || (f).mFormat.mFormatID == kAudioFormat60958AC3 || (f).mFormat.mFormatID == kAudioFormatAC3)
+
+static inline gboolean
+_audio_system_set_runloop (CFRunLoopRef runLoop)
+{
+  OSStatus status = noErr;
+
+  gboolean res = FALSE;
+
+  AudioObjectPropertyAddress runloopAddress = {
+    kAudioHardwarePropertyRunLoop,
+    kAudioObjectPropertyScopeGlobal,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectSetPropertyData (kAudioObjectSystemObject,
+      &runloopAddress, 0, NULL, sizeof (CFRunLoopRef), &runLoop);
+  if (status == noErr) {
+    res = TRUE;
+  } else {
+    GST_ERROR ("failed to set runloop to %p: %" GST_FOURCC_FORMAT,
+        runLoop, GST_FOURCC_ARGS (status));
+  }
+
+  return res;
+}
+
+static inline AudioDeviceID
+_audio_system_get_default_output (void)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = sizeof (AudioDeviceID);
+  AudioDeviceID device_id = kAudioDeviceUnknown;
+
+  AudioObjectPropertyAddress defaultDeviceAddress = {
+    kAudioHardwarePropertyDefaultOutputDevice,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyData (kAudioObjectSystemObject,
+      &defaultDeviceAddress, 0, NULL, &propertySize, &device_id);
+  if (status != noErr) {
+    GST_ERROR ("failed getting default output device: %"
+        GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+  }
+
+  return device_id;
+}
+
+static inline AudioDeviceID *
+_audio_system_get_devices (gint * ndevices)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = 0;
+  AudioDeviceID *devices = NULL;
+
+  AudioObjectPropertyAddress audioDevicesAddress = {
+    kAudioHardwarePropertyDevices,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyDataSize (kAudioObjectSystemObject,
+      &audioDevicesAddress, 0, NULL, &propertySize);
+  if (status != noErr) {
+    GST_WARNING ("failed getting number of devices: %"
+        GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+    return NULL;
+  }
+
+  *ndevices = propertySize / sizeof (AudioDeviceID);
+
+  devices = (AudioDeviceID *) g_malloc (propertySize);
+  if (devices) {
+    status = AudioObjectGetPropertyData (kAudioObjectSystemObject,
+        &audioDevicesAddress, 0, NULL, &propertySize, devices);
+    if (status != noErr) {
+      GST_WARNING ("failed getting the list of devices: %"
+          GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+      g_free (devices);
+      *ndevices = 0;
+      return NULL;
+    }
+  }
+  return devices;
+}
+
+static inline gboolean
+_audio_device_is_alive (AudioDeviceID device_id)
+{
+  OSStatus status = noErr;
+  int alive = FALSE;
+  UInt32 propertySize = sizeof (alive);
+
+  AudioObjectPropertyAddress audioDeviceAliveAddress = {
+    kAudioDevicePropertyDeviceIsAlive,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyData (device_id,
+      &audioDeviceAliveAddress, 0, NULL, &propertySize, &alive);
+  if (status != noErr) {
+    alive = FALSE;
+  }
+
+  return alive;
+}
+
+static inline guint
+_audio_device_get_latency (AudioDeviceID device_id)
+{
+  OSStatus status = noErr;
+  UInt32 latency = 0;
+  UInt32 propertySize = sizeof (latency);
+
+  AudioObjectPropertyAddress audioDeviceLatencyAddress = {
+    kAudioDevicePropertyLatency,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyData (device_id,
+      &audioDeviceLatencyAddress, 0, NULL, &propertySize, &latency);
+  if (status != noErr) {
+    GST_ERROR ("failed to get latency: %" GST_FOURCC_FORMAT,
+        GST_FOURCC_ARGS (status));
+    latency = -1;
+  }
+
+  return latency;
+}
+
+static inline pid_t
+_audio_device_get_hog (AudioDeviceID device_id)
+{
+  OSStatus status = noErr;
+  pid_t hog_pid;
+  UInt32 propertySize = sizeof (hog_pid);
+
+  AudioObjectPropertyAddress audioDeviceHogModeAddress = {
+    kAudioDevicePropertyHogMode,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyData (device_id,
+      &audioDeviceHogModeAddress, 0, NULL, &propertySize, &hog_pid);
+  if (status != noErr) {
+    GST_ERROR ("failed to get hog: %" GST_FOURCC_FORMAT,
+        GST_FOURCC_ARGS (status));
+    hog_pid = -1;
+  }
+
+  return hog_pid;
+}
+
+static inline gboolean
+_audio_device_set_hog (AudioDeviceID device_id, pid_t hog_pid)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = sizeof (hog_pid);
+  gboolean res = FALSE;
+
+  AudioObjectPropertyAddress audioDeviceHogModeAddress = {
+    kAudioDevicePropertyHogMode,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectSetPropertyData (device_id,
+      &audioDeviceHogModeAddress, 0, NULL, propertySize, &hog_pid);
+
+  if (status == noErr) {
+    res = TRUE;
+  } else {
+    GST_ERROR ("failed to set hog: %" GST_FOURCC_FORMAT,
+        GST_FOURCC_ARGS (status));
+  }
+
+  return res;
+}
+
+static inline gboolean
+_audio_device_set_mixing (AudioDeviceID device_id, gboolean enable_mix)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = 0, can_mix = enable_mix;
+  Boolean writable = FALSE;
+  gboolean res = FALSE;
+
+  AudioObjectPropertyAddress audioDeviceSupportsMixingAddress = {
+    kAudioDevicePropertySupportsMixing,
+    kAudioObjectPropertyScopeGlobal,
+    kAudioObjectPropertyElementMaster
+  };
+
+  if (AudioObjectHasProperty (device_id, &audioDeviceSupportsMixingAddress)) {
+    /* Set mixable to false if we are allowed to */
+    status = AudioObjectIsPropertySettable (device_id,
+        &audioDeviceSupportsMixingAddress, &writable);
+    if (status) {
+      GST_DEBUG ("AudioObjectIsPropertySettable: %" GST_FOURCC_FORMAT,
+          GST_FOURCC_ARGS (status));
+    }
+    status = AudioObjectGetPropertyDataSize (device_id,
+        &audioDeviceSupportsMixingAddress, 0, NULL, &propertySize);
+    if (status) {
+      GST_DEBUG ("AudioObjectGetPropertyDataSize: %" GST_FOURCC_FORMAT,
+          GST_FOURCC_ARGS (status));
+    }
+    status = AudioObjectGetPropertyData (device_id,
+        &audioDeviceSupportsMixingAddress, 0, NULL, &propertySize, &can_mix);
+    if (status) {
+      GST_DEBUG ("AudioObjectGetPropertyData: %" GST_FOURCC_FORMAT,
+          GST_FOURCC_ARGS (status));
+    }
+
+    if (status == noErr && writable) {
+      can_mix = enable_mix;
+      status = AudioObjectSetPropertyData (device_id,
+          &audioDeviceSupportsMixingAddress, 0, NULL, propertySize, &can_mix);
+      res = TRUE;
+    }
+
+    if (status != noErr) {
+      GST_ERROR ("failed to set mixmode: %" GST_FOURCC_FORMAT,
+          GST_FOURCC_ARGS (status));
+    }
+  } else {
+    GST_DEBUG ("property not found, mixing coudln't be changed");
+  }
+
+  return res;
+}
+
+static inline gchar *
+_audio_device_get_name (AudioDeviceID device_id)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = 0;
+  gchar *device_name = NULL;
+
+  AudioObjectPropertyAddress deviceNameAddress = {
+    kAudioDevicePropertyDeviceName,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  /* Get the length of the device name */
+  status = AudioObjectGetPropertyDataSize (device_id,
+      &deviceNameAddress, 0, NULL, &propertySize);
+  if (status != noErr) {
+    goto beach;
+  }
+
+  /* Get the name of the device */
+  device_name = (gchar *) g_malloc (propertySize);
+  status = AudioObjectGetPropertyData (device_id,
+      &deviceNameAddress, 0, NULL, &propertySize, device_name);
+  if (status != noErr) {
+    g_free (device_name);
+    device_name = NULL;
+  }
+
+beach:
+  return device_name;
+}
+
+static inline gboolean
+_audio_device_has_output (AudioDeviceID device_id)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize;
+
+  AudioObjectPropertyAddress streamsAddress = {
+    kAudioDevicePropertyStreams,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyDataSize (device_id,
+      &streamsAddress, 0, NULL, &propertySize);
+  if (status != noErr) {
+    return FALSE;
+  }
+  if (propertySize == 0) {
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+static inline AudioChannelLayout *
+_audio_device_get_channel_layout (AudioDeviceID device_id)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = 0;
+  AudioChannelLayout *channel_layout = NULL;
+
+  AudioObjectPropertyAddress channelLayoutAddress = {
+    kAudioDevicePropertyPreferredChannelLayout,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  /* Get the length of the default channel layout structure */
+  status = AudioObjectGetPropertyDataSize (device_id,
+      &channelLayoutAddress, 0, NULL, &propertySize);
+  if (status != noErr) {
+    goto beach;
+  }
+
+  /* Get the default channel layout of the device */
+  channel_layout = (AudioChannelLayout *) g_malloc (propertySize);
+  status = AudioObjectGetPropertyData (device_id,
+      &channelLayoutAddress, 0, NULL, &propertySize, channel_layout);
+  if (status != noErr) {
+    g_free (channel_layout);
+    channel_layout = NULL;
+  }
+
+beach:
+  return channel_layout;
+}
+
+static inline AudioStreamID *
+_audio_device_get_streams (AudioDeviceID device_id, gint * nstreams)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = 0;
+  AudioStreamID *streams = NULL;
+
+  AudioObjectPropertyAddress streamsAddress = {
+    kAudioDevicePropertyStreams,
+    kAudioDevicePropertyScopeOutput,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyDataSize (device_id,
+      &streamsAddress, 0, NULL, &propertySize);
+  if (status != noErr) {
+    GST_WARNING ("failed getting number of streams: %"
+        GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+    return NULL;
+  }
+
+  *nstreams = propertySize / sizeof (AudioStreamID);
+  streams = (AudioStreamID *) g_malloc (propertySize);
+
+  if (streams) {
+    status = AudioObjectGetPropertyData (device_id,
+        &streamsAddress, 0, NULL, &propertySize, streams);
+    if (status != noErr) {
+      GST_WARNING ("failed getting the list of streams: %"
+          GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+      g_free (streams);
+      *nstreams = 0;
+      return NULL;
+    }
+  }
+
+  return streams;
+}
+
+static inline guint
+_audio_stream_get_latency (AudioStreamID stream_id)
+{
+  OSStatus status = noErr;
+  UInt32 latency;
+  UInt32 propertySize = sizeof (latency);
+
+  AudioObjectPropertyAddress latencyAddress = {
+    kAudioStreamPropertyLatency,
+    kAudioObjectPropertyScopeGlobal,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyData (stream_id,
+      &latencyAddress, 0, NULL, &propertySize, &latency);
+  if (status != noErr) {
+    GST_ERROR ("failed to get latency: %" GST_FOURCC_FORMAT,
+        GST_FOURCC_ARGS (status));
+    latency = -1;
+  }
+
+  return latency;
+}
+
+static inline gboolean
+_audio_stream_get_current_format (AudioStreamID stream_id,
+    AudioStreamBasicDescription * format)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = sizeof (AudioStreamBasicDescription);
+
+  AudioObjectPropertyAddress formatAddress = {
+    kAudioStreamPropertyPhysicalFormat,
+    kAudioObjectPropertyScopeGlobal,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyData (stream_id,
+      &formatAddress, 0, NULL, &propertySize, format);
+  if (status != noErr) {
+    GST_ERROR ("failed to get current format: %" GST_FOURCC_FORMAT,
+        GST_FOURCC_ARGS (status));
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+static inline gboolean
+_audio_stream_set_current_format (AudioStreamID stream_id,
+    AudioStreamBasicDescription format)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = sizeof (AudioStreamBasicDescription);
+
+  AudioObjectPropertyAddress formatAddress = {
+    kAudioStreamPropertyPhysicalFormat,
+    kAudioObjectPropertyScopeGlobal,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectSetPropertyData (stream_id,
+      &formatAddress, 0, NULL, propertySize, &format);
+  if (status != noErr) {
+    GST_ERROR ("failed to set current format: %" GST_FOURCC_FORMAT,
+        GST_FOURCC_ARGS (status));
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+static inline AudioStreamRangedDescription *
+_audio_stream_get_formats (AudioStreamID stream_id, gint * nformats)
+{
+  OSStatus status = noErr;
+  UInt32 propertySize = 0;
+  AudioStreamRangedDescription *formats = NULL;
+
+  AudioObjectPropertyAddress formatsAddress = {
+    kAudioStreamPropertyAvailablePhysicalFormats,
+    kAudioObjectPropertyScopeGlobal,
+    kAudioObjectPropertyElementMaster
+  };
+
+  status = AudioObjectGetPropertyDataSize (stream_id,
+      &formatsAddress, 0, NULL, &propertySize);
+  if (status != noErr) {
+    GST_WARNING ("failed getting number of stream formats: %"
+        GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+    return NULL;
+  }
+
+  *nformats = propertySize / sizeof (AudioStreamRangedDescription);
+
+  formats = (AudioStreamRangedDescription *) g_malloc (propertySize);
+  if (formats) {
+    status = AudioObjectGetPropertyData (stream_id,
+        &formatsAddress, 0, NULL, &propertySize, formats);
+    if (status != noErr) {
+      GST_WARNING ("failed getting the list of stream formats: %"
+          GST_FOURCC_FORMAT, GST_FOURCC_ARGS (status));
+      g_free (formats);
+      *nformats = 0;
+      return NULL;
+    }
+  }
+  return formats;
+}
+
+static inline gboolean
+_audio_stream_is_spdif_avail (AudioStreamID stream_id)
+{
+  AudioStreamRangedDescription *formats;
+  gint i, nformats = 0;
+  gboolean res = FALSE;
+
+  formats = _audio_stream_get_formats (stream_id, &nformats);
+  GST_DEBUG ("found %d stream formats", nformats);
+
+  if (formats) {
+    GST_DEBUG ("formats supported on stream ID: %u",
+        (unsigned) stream_id);
+
+    for (i = 0; i < nformats; i++) {
+      GST_DEBUG ("  " CORE_AUDIO_FORMAT,
+          CORE_AUDIO_FORMAT_ARGS (formats[i].mFormat));
+
+      if (CORE_AUDIO_FORMAT_IS_SPDIF (formats[i])) {
+        res = TRUE;
+      }
+    }
+    g_free (formats);
+  }
+
+  return res;
+}
+
+static inline gboolean
+_audio_device_is_spdif_avail (AudioDeviceID device_id)
+{
+  AudioStreamID *streams = NULL;
+  gint i, nstreams = 0;
+  gboolean res = FALSE;
+
+  streams = _audio_device_get_streams (device_id, &nstreams);
+  GST_DEBUG ("found %d streams", nstreams);
+  if (streams) {
+    for (i = 0; i < nstreams; i++) {
+      if (_audio_stream_is_spdif_avail (streams[i])) {
+        res = TRUE;
+      }
+    }
+
+    g_free (streams);
+  }
+
+  return res;
+}
+

sys/osxaudio/gstosxringbuffer.h

@@ -1,6 +1,7 @@
 /*
  * GStreamer
  * Copyright (C) 2006 Zaheer Abbas Merali <zaheerabbas at merali dot org>
+ * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -64,6 +65,8 @@ G_BEGIN_DECLS
 #define GST_IS_OSX_RING_BUFFER_CLASS(klass) \
   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_OSX_RING_BUFFER))
 
+#define RINGBUFFER_IS_SPDIF(t) ((t) == GST_BUFTYPE_AC3 || (t) == GST_BUFTYPE_DTS)
+
 typedef struct _GstOsxRingBuffer GstOsxRingBuffer;
 typedef struct _GstOsxRingBufferClass GstOsxRingBufferClass;
 
@@ -71,15 +74,31 @@ struct _GstOsxRingBuffer
 {
   GstRingBuffer object;
 
+  gboolean is_spdif_capable;
   gboolean is_src;
-  AudioUnit audiounit;
+  gboolean is_passthrough;
+  gint stream_idx;
+
   AudioDeviceID device_id;
   gboolean io_proc_active;
   gboolean io_proc_needs_deactivation;
   guint buffer_len;
   guint segoffset;
-  AudioBufferList * recBufferList;
+
-  GstOsxAudioElementInterface * element;
+  GstOsxAudioElementInterface *element;
+
+  /* For LPCM in/out */
+  AudioUnit audiounit;
+  AudioBufferList *recBufferList;
+
+  /* For SPDIF out */
+  pid_t hog_pid;
+  gboolean disabled_mixing;
+  AudioStreamID stream_id;
+  gboolean revert_format;
+  AudioStreamBasicDescription stream_format;
+  AudioStreamBasicDescription original_format;
+  AudioDeviceIOProcID procID;
 };
 
 struct _GstOsxRingBufferClass
@@ -92,3 +111,4 @@ GType gst_osx_ring_buffer_get_type (void);
 G_END_DECLS
 
 #endif /* __GST_OSX_RING_BUFFER_H__ */
+