gstreamer/sys/osxaudio/gstosxcoreaudioremoteio.c

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/*
* 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;
}