gstreamer/sys/osxaudio/gstosxcoreaudioremoteio.c
Arun Raghavan 691ecebe22 osxaudio: Don't set the format on an initialized AudioUnit
We need to initialize the AudioUnit early to be able to probe the
underlying device, but according to the AudioUnitInitialize() and
AudioUnitUninitialize() documentation, format changes should be done
while the AudioUnit is uninitialized. So we explicitly uninitialize the
AudioUnit during a format change and reinitialize it when we're done.
2015-07-14 17:49:50 +05:30

137 lines
3.9 KiB
C

/*
* 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 = sizeof (double);
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: %d", (int) 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)
{
gboolean ret = FALSE;
OSStatus status;
/* Uninitialize the AudioUnit before changing formats */
status = AudioUnitUninitialize (core_audio->audiounit);
if (status) {
GST_ERROR_OBJECT (core_audio, "Failed to uninitialize AudioUnit: %d",
(int) status);
return FALSE;
}
core_audio->is_passthrough = is_passthrough;
core_audio->stream_idx = 0;
if (!gst_core_audio_set_format (core_audio, format))
goto done;
/* 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");
ret = TRUE;
done:
/* Format changed, initialise the AudioUnit again */
status = AudioUnitInitialize (core_audio->audiounit);
if (status) {
GST_ERROR_OBJECT (core_audio, "Failed to initialize AudioUnit: %d",
(int) status);
ret = FALSE;
}
return ret;
}
static gboolean
gst_core_audio_select_device_impl (GstCoreAudio * core_audio)
{
/* No device selection in iOS */
return TRUE;
}
static gboolean
gst_core_audio_audio_device_is_spdif_avail_impl (AudioDeviceID device_id)
{
/* No SPDIF in iOS */
return FALSE;
}