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691ecebe22
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.
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* GStreamer
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* Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
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* Authors: Andoni Morales Alastruey <amorales@fluendo.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*/
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#import <AudioUnit/AUComponent.h>
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static gboolean
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gst_core_audio_open_impl (GstCoreAudio * core_audio)
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{
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return gst_core_audio_open_device (core_audio, kAudioUnitSubType_RemoteIO,
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"RemoteIO");
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}
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static gboolean
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gst_core_audio_start_processing_impl (GstCoreAudio * core_audio)
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{
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return gst_core_audio_io_proc_start (core_audio);
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}
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static gboolean
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gst_core_audio_pause_processing_impl (GstCoreAudio * core_audio)
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{
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GST_DEBUG_OBJECT (core_audio,
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"osx ring buffer pause ioproc: %p device_id %lu",
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core_audio->element->io_proc, (gulong) core_audio->device_id);
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if (core_audio->io_proc_active) {
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/* CoreAudio isn't threadsafe enough to do this here;
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* we must deactivate the render callback elsewhere. See:
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* http://lists.apple.com/archives/Coreaudio-api/2006/Mar/msg00010.html
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*/
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core_audio->io_proc_needs_deactivation = TRUE;
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}
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return TRUE;
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}
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static gboolean
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gst_core_audio_stop_processing_impl (GstCoreAudio * core_audio)
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{
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gst_core_audio_io_proc_stop (core_audio);
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return TRUE;
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}
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static gboolean
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gst_core_audio_get_samples_and_latency_impl (GstCoreAudio * core_audio,
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gdouble rate, guint * samples, gdouble * latency)
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{
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OSStatus status;
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UInt32 size = sizeof (double);
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status = AudioUnitGetProperty (core_audio->audiounit, kAudioUnitProperty_Latency, kAudioUnitScope_Global, 0, /* N/A for global */
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latency, &size);
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if (status) {
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GST_WARNING_OBJECT (core_audio, "Failed to get latency: %d", (int) status);
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*samples = 0;
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return FALSE;
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}
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*samples = *latency * rate;
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return TRUE;
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}
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static gboolean
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gst_core_audio_initialize_impl (GstCoreAudio * core_audio,
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AudioStreamBasicDescription format, GstCaps * caps,
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gboolean is_passthrough, guint32 * frame_size)
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{
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gboolean ret = FALSE;
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OSStatus status;
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/* Uninitialize the AudioUnit before changing formats */
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status = AudioUnitUninitialize (core_audio->audiounit);
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if (status) {
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GST_ERROR_OBJECT (core_audio, "Failed to uninitialize AudioUnit: %d",
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(int) status);
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return FALSE;
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}
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core_audio->is_passthrough = is_passthrough;
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core_audio->stream_idx = 0;
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if (!gst_core_audio_set_format (core_audio, format))
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goto done;
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/* FIXME: Use kAudioSessionProperty_CurrentHardwareSampleRate and
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* kAudioSessionProperty_CurrentHardwareIOBufferDuration with property
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* listeners to detect changes in screen locks.
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* For now use the maximum value */
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*frame_size = 4196;
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GST_DEBUG_OBJECT (core_audio, "osxbuf ring buffer acquired");
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ret = TRUE;
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done:
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/* Format changed, initialise the AudioUnit again */
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status = AudioUnitInitialize (core_audio->audiounit);
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if (status) {
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GST_ERROR_OBJECT (core_audio, "Failed to initialize AudioUnit: %d",
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(int) status);
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ret = FALSE;
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}
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return ret;
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}
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static gboolean
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gst_core_audio_select_device_impl (GstCoreAudio * core_audio)
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{
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/* No device selection in iOS */
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return TRUE;
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}
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static gboolean
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gst_core_audio_audio_device_is_spdif_avail_impl (AudioDeviceID device_id)
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{
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/* No SPDIF in iOS */
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return FALSE;
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}
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