gstreamer/sys/osxaudio/gstosxaudiosink.c
Josep Torra d2c6cc3a39 osxaudiosink: respect the prefered channel layout
In OSX is allowed to configure the default audio output device,
prefered channel layout and speaker positions through the tool
"Audio MIDI Setup".
2012-06-19 12:55:37 +01:00

725 lines
22 KiB
C

/*
* 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"),
* 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
*
*/
/**
* SECTION:element-osxaudiosink
*
* This element renders raw audio samples using the CoreAudio api.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch filesrc location=sine.ogg ! oggdemux ! vorbisdec ! audioconvert ! audioresample ! osxaudiosink
* ]| Play an Ogg/Vorbis file.
* </refsect2>
*
* Last reviewed on 2006-03-01 (0.10.4)
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <gst/audio/multichannel.h>
#include <gst/audio/gstaudioiec61937.h>
#include <CoreAudio/CoreAudio.h>
#include <CoreAudio/AudioHardware.h>
#include "gstosxaudiosink.h"
#include "gstosxaudioelement.h"
GST_DEBUG_CATEGORY_STATIC (osx_audiosink_debug);
#define GST_CAT_DEFAULT osx_audiosink_debug
#include "gstosxcoreaudio.h"
/* Filter signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_DEVICE,
ARG_VOLUME
};
#define DEFAULT_VOLUME 1.0
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-float, "
"endianness = (int) {" G_STRINGIFY (G_BYTE_ORDER) " }, "
"signed = (boolean) { TRUE }, "
"width = (int) 32, "
"depth = (int) 32, "
"rate = (int) [1, MAX], "
"channels = (int) [1, 9];"
"audio/x-raw-int, "
"endianness = (int) {" G_STRINGIFY (G_BYTE_ORDER) " }, "
"signed = (boolean) { TRUE }, "
"width = (int) 32, "
"depth = (int) 32, "
"rate = (int) [1, MAX], "
"channels = (int) [1, 9];"
"audio/x-raw-int, "
"endianness = (int) {" G_STRINGIFY (G_BYTE_ORDER) " }, "
"signed = (boolean) { TRUE }, "
"width = (int) 24, "
"depth = (int) 24, "
"rate = (int) [1, MAX], "
"channels = (int) [1, 9];"
"audio/x-raw-int, "
"endianness = (int) {" G_STRINGIFY (G_BYTE_ORDER) " }, "
"signed = (boolean) { TRUE }, "
"width = (int) 16, "
"depth = (int) 16, "
"rate = (int) [1, MAX], "
"channels = (int) [1, 9];"
"audio/x-raw-int, "
"endianness = (int) {" G_STRINGIFY (G_BYTE_ORDER) " }, "
"signed = (boolean) { TRUE }, "
"width = (int) 8, "
"depth = (int) 8, "
"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,
const GValue * value, GParamSpec * pspec);
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 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,
AudioUnitRenderActionFlags * ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * bufferList);
static void
gst_osx_audio_sink_do_init (GType type)
{
static const GInterfaceInfo osxelement_info = {
gst_osx_audio_sink_osxelement_init,
NULL,
NULL
};
GST_DEBUG_CATEGORY_INIT (osx_audiosink_debug, "osxaudiosink", 0,
"OSX Audio Sink");
GST_DEBUG ("Adding static interface");
g_type_add_interface_static (type, GST_OSX_AUDIO_ELEMENT_TYPE,
&osxelement_info);
}
GST_BOILERPLATE_FULL (GstOsxAudioSink, gst_osx_audio_sink, GstBaseAudioSink,
GST_TYPE_BASE_AUDIO_SINK, gst_osx_audio_sink_do_init);
static void
gst_osx_audio_sink_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_static_metadata (element_class, "Audio Sink (OSX)",
"Sink/Audio",
"Output to a sound card in OS X",
"Zaheer Abbas Merali <zaheerabbas at merali dot org>");
}
static void
gst_osx_audio_sink_class_init (GstOsxAudioSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
GstBaseAudioSinkClass *gstbaseaudiosink_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesink_class = (GstBaseSinkClass *) klass;
gstbaseaudiosink_class = (GstBaseAudioSinkClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_osx_audio_sink_set_property;
gobject_class->get_property = gst_osx_audio_sink_get_property;
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));
g_object_class_install_property (gobject_class, ARG_VOLUME,
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
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
gst_osx_audio_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstOsxAudioSink *sink = GST_OSX_AUDIO_SINK (object);
switch (prop_id) {
case ARG_DEVICE:
sink->device_id = g_value_get_int (value);
break;
case ARG_VOLUME:
sink->volume = g_value_get_double (value);
gst_osx_audio_sink_set_volume (sink);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_osx_audio_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstOsxAudioSink *sink = GST_OSX_AUDIO_SINK (object);
switch (prop_id) {
case ARG_DEVICE:
g_value_set_int (value, sink->device_id);
break;
case ARG_VOLUME:
g_value_set_double (value, sink->volume);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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);
gchar *caps_string = NULL;
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);
}
GST_DEBUG_OBJECT (sink, "using template caps");
return NULL;
}
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;
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;
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)
{
GstOsxAudioSink *osxsink;
GstOsxRingBuffer *ringbuffer;
osxsink = GST_OSX_AUDIO_SINK (sink);
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 %p element %p ioproc %p", osxsink,
GST_OSX_AUDIO_ELEMENT_GET_INTERFACE (osxsink),
(void *) gst_osx_audio_sink_io_proc);
gst_osx_audio_sink_set_volume (osxsink);
ringbuffer->element = GST_OSX_AUDIO_ELEMENT_GET_INTERFACE (osxsink);
ringbuffer->device_id = osxsink->device_id;
return GST_RING_BUFFER (ringbuffer);
}
/* HALOutput AudioUnit will request fairly arbitrarily-sized chunks
* of data, not of a fixed size. So, we keep track of where in
* the current ringbuffer segment we are, and only advance the segment
* once we've read the whole thing */
static OSStatus
gst_osx_audio_sink_io_proc (GstOsxRingBuffer * buf,
AudioUnitRenderActionFlags * ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * bufferList)
{
guint8 *readptr;
gint readseg;
gint len;
gint stream_idx = buf->stream_idx;
gint remaining = bufferList->mBuffers[stream_idx].mDataByteSize;
gint offset = 0;
while (remaining) {
if (!gst_ring_buffer_prepare_read (GST_RING_BUFFER (buf),
&readseg, &readptr, &len))
return 0;
len -= buf->segoffset;
if (len > remaining)
len = remaining;
memcpy ((char *) bufferList->mBuffers[stream_idx].mData + offset,
readptr + buf->segoffset, len);
buf->segoffset += len;
offset += len;
remaining -= len;
if ((gint) buf->segoffset == GST_RING_BUFFER (buf)->spec.segsize) {
/* clear written samples */
gst_ring_buffer_clear (GST_RING_BUFFER (buf), readseg);
/* we wrote one segment */
gst_ring_buffer_advance (GST_RING_BUFFER (buf), 1);
buf->segoffset = 0;
}
}
return 0;
}
static void
gst_osx_audio_sink_osxelement_init (gpointer g_iface, gpointer iface_data)
{
GstOsxAudioElementInterface *iface = (GstOsxAudioElementInterface *) g_iface;
iface->io_proc = (AURenderCallback) gst_osx_audio_sink_io_proc;
}
static void
gst_osx_audio_sink_set_volume (GstOsxAudioSink * sink)
{
if (!sink->audiounit)
return;
AudioUnitSetParameter (sink->audiounit, kHALOutputParam_Volume,
kAudioUnitScope_Global, 0, (float) sink->volume, 0);
}
static inline void
_dump_channel_layout (AudioChannelLayout * channel_layout)
{
UInt32 i;
GST_DEBUG ("mChannelLayoutTag: 0x%lx",
(unsigned long) channel_layout->mChannelLayoutTag);
GST_DEBUG ("mChannelBitmap: 0x%lx",
(unsigned long) channel_layout->mChannelBitmap);
GST_DEBUG ("mNumberChannelDescriptions: %lu",
(unsigned long) channel_layout->mNumberChannelDescriptions);
for (i = 0; i < channel_layout->mNumberChannelDescriptions; i++) {
AudioChannelDescription *channel_desc =
&channel_layout->mChannelDescriptions[i];
GST_DEBUG (" mChannelLabel: 0x%lx mChannelFlags: 0x%lx "
"mCoordinates[0]: %f mCoordinates[1]: %f "
"mCoordinates[2]: %f",
(unsigned long) channel_desc->mChannelLabel,
(unsigned long) channel_desc->mChannelFlags,
channel_desc->mCoordinates[0], channel_desc->mCoordinates[1],
channel_desc->mCoordinates[2]);
}
}
static gboolean
gst_osx_audio_sink_allowed_caps (GstOsxAudioSink * osxsink)
{
gint i, max_channels = 0;
gboolean spdif_allowed, use_positions = FALSE;
AudioChannelLayout *layout;
GstElementClass *element_class;
GstPadTemplate *pad_template;
GstCaps *caps, *in_caps;
GstAudioChannelPosition pos[9] = {
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID,
GST_AUDIO_CHANNEL_POSITION_INVALID
};
/* First collect info about the HW capabilites and preferences */
spdif_allowed = _audio_device_is_spdif_avail (osxsink->device_id);
layout = _audio_device_get_channel_layout (osxsink->device_id);
GST_DEBUG_OBJECT (osxsink, "Selected device ID: %u SPDIF allowed: %d",
(unsigned) osxsink->device_id, spdif_allowed);
if (layout) {
_dump_channel_layout (layout);
max_channels = layout->mNumberChannelDescriptions;
} else {
GST_WARNING_OBJECT (osxsink, "This driver does not support "
"kAudioDevicePropertyPreferredChannelLayout.");
max_channels = 2;
}
if (max_channels > 2) {
max_channels = MIN (max_channels, 9);
use_positions = TRUE;
for (i = 0; i < max_channels; i++) {
switch (layout->mChannelDescriptions[i].mChannelLabel) {
case kAudioChannelLabel_Left:
pos[i] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
break;
case kAudioChannelLabel_Right:
pos[i] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
break;
case kAudioChannelLabel_Center:
pos[i] = GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER;
break;
case kAudioChannelLabel_LFEScreen:
pos[i] = GST_AUDIO_CHANNEL_POSITION_LFE;
break;
case kAudioChannelLabel_LeftSurround:
pos[i] = GST_AUDIO_CHANNEL_POSITION_REAR_LEFT;
break;
case kAudioChannelLabel_RightSurround:
pos[i] = GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT;
break;
case kAudioChannelLabel_RearSurroundLeft:
pos[i] = GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT;
break;
case kAudioChannelLabel_RearSurroundRight:
pos[i] = GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT;
break;
case kAudioChannelLabel_CenterSurround:
pos[i] = GST_AUDIO_CHANNEL_POSITION_REAR_CENTER;
break;
default:
GST_WARNING_OBJECT (osxsink, "unrecognized channel: %d",
(int) layout->mChannelDescriptions[i].mChannelLabel);
use_positions = FALSE;
max_channels = 2;
break;
}
}
}
g_free (layout);
/* Recover the template caps */
element_class = GST_ELEMENT_GET_CLASS (osxsink);
pad_template = gst_element_class_get_pad_template (element_class, "sink");
in_caps = gst_pad_template_get_caps (pad_template);
/* Create the allowed subset */
caps = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (in_caps); i++) {
GstStructure *in_s, *out_s;
in_s = gst_caps_get_structure (in_caps, i);
if (gst_structure_has_name (in_s, "audio/x-ac3") ||
gst_structure_has_name (in_s, "audio/x-dts")) {
if (spdif_allowed) {
gst_caps_append_structure (caps, gst_structure_copy (in_s));
}
} else {
if (max_channels > 2 && use_positions) {
out_s = gst_structure_copy (in_s);
gst_structure_remove_field (out_s, "channels");
gst_structure_set (out_s, "channels", G_TYPE_INT, max_channels, NULL);
gst_audio_set_channel_positions (out_s, pos);
gst_caps_append_structure (caps, out_s);
}
out_s = gst_structure_copy (in_s);
gst_structure_remove_field (out_s, "channels");
gst_structure_set (out_s, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
gst_caps_append_structure (caps, out_s);
}
}
if (osxsink->cached_caps) {
gst_caps_unref (osxsink->cached_caps);
}
osxsink->cached_caps = caps;
return TRUE;
}
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;
goto done;
}
}
res = gst_osx_audio_sink_allowed_caps (osxsink);
done:
g_free (devices);
return res;
}