1 /*
2 * GStreamer
3 * Copyright (C) 2012 Fluendo S.A. <support@fluendo.com>
4 * Authors: Andoni Morales Alastruey <amorales@fluendo.com>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
20 *
21 */
22
23 #import <AudioUnit/AUComponent.h>
24
25 static gboolean
gst_core_audio_open_impl(GstCoreAudio * core_audio)26 gst_core_audio_open_impl (GstCoreAudio * core_audio)
27 {
28 return gst_core_audio_open_device (core_audio, kAudioUnitSubType_RemoteIO,
29 "RemoteIO");
30 }
31
32 static gboolean
gst_core_audio_start_processing_impl(GstCoreAudio * core_audio)33 gst_core_audio_start_processing_impl (GstCoreAudio * core_audio)
34 {
35 return gst_core_audio_io_proc_start (core_audio);
36 }
37
38 static gboolean
gst_core_audio_pause_processing_impl(GstCoreAudio * core_audio)39 gst_core_audio_pause_processing_impl (GstCoreAudio * core_audio)
40 {
41 GST_DEBUG_OBJECT (core_audio,
42 "osx ring buffer pause ioproc: %p device_id %lu",
43 core_audio->element->io_proc, (gulong) core_audio->device_id);
44
45 if (core_audio->io_proc_active) {
46 /* CoreAudio isn't threadsafe enough to do this here;
47 * we must deactivate the render callback elsewhere. See:
48 * http://lists.apple.com/archives/Coreaudio-api/2006/Mar/msg00010.html
49 */
50 core_audio->io_proc_needs_deactivation = TRUE;
51 }
52 return TRUE;
53 }
54
55 static gboolean
gst_core_audio_stop_processing_impl(GstCoreAudio * core_audio)56 gst_core_audio_stop_processing_impl (GstCoreAudio * core_audio)
57 {
58 gst_core_audio_io_proc_stop (core_audio);
59 return TRUE;
60 }
61
62 static gboolean
gst_core_audio_get_samples_and_latency_impl(GstCoreAudio * core_audio,gdouble rate,guint * samples,gdouble * latency)63 gst_core_audio_get_samples_and_latency_impl (GstCoreAudio * core_audio,
64 gdouble rate, guint * samples, gdouble * latency)
65 {
66 OSStatus status;
67 UInt32 size = sizeof (double);
68
69 status = AudioUnitGetProperty (core_audio->audiounit, kAudioUnitProperty_Latency, kAudioUnitScope_Global, 0, /* N/A for global */
70 latency, &size);
71
72 if (status) {
73 GST_WARNING_OBJECT (core_audio, "Failed to get latency: %d", (int) status);
74 *samples = 0;
75 return FALSE;
76 }
77
78 *samples = *latency * rate;
79 return TRUE;
80 }
81
82 static gboolean
gst_core_audio_initialize_impl(GstCoreAudio * core_audio,AudioStreamBasicDescription format,GstCaps * caps,gboolean is_passthrough,guint32 * frame_size)83 gst_core_audio_initialize_impl (GstCoreAudio * core_audio,
84 AudioStreamBasicDescription format, GstCaps * caps,
85 gboolean is_passthrough, guint32 * frame_size)
86 {
87 gboolean ret = FALSE;
88 OSStatus status;
89
90 /* Uninitialize the AudioUnit before changing formats */
91 status = AudioUnitUninitialize (core_audio->audiounit);
92 if (status) {
93 GST_ERROR_OBJECT (core_audio, "Failed to uninitialize AudioUnit: %d",
94 (int) status);
95 return FALSE;
96 }
97
98 core_audio->is_passthrough = is_passthrough;
99 core_audio->stream_idx = 0;
100
101 if (!gst_core_audio_set_format (core_audio, format))
102 goto done;
103
104 /* FIXME: Use kAudioSessionProperty_CurrentHardwareSampleRate and
105 * kAudioSessionProperty_CurrentHardwareIOBufferDuration with property
106 * listeners to detect changes in screen locks.
107 * For now use the maximum value */
108 *frame_size = 4196;
109
110 GST_DEBUG_OBJECT (core_audio, "osxbuf ring buffer acquired");
111 ret = TRUE;
112
113 done:
114 /* Format changed, initialise the AudioUnit again */
115 status = AudioUnitInitialize (core_audio->audiounit);
116 if (status) {
117 GST_ERROR_OBJECT (core_audio, "Failed to initialize AudioUnit: %d",
118 (int) status);
119 ret = FALSE;
120 }
121
122 return ret;
123 }
124
125 static gboolean
gst_core_audio_select_device_impl(GstCoreAudio * core_audio)126 gst_core_audio_select_device_impl (GstCoreAudio * core_audio)
127 {
128 /* No device selection in iOS */
129 return TRUE;
130 }
131
132 static gboolean
gst_core_audio_audio_device_is_spdif_avail_impl(AudioDeviceID device_id)133 gst_core_audio_audio_device_is_spdif_avail_impl (AudioDeviceID device_id)
134 {
135 /* No SPDIF in iOS */
136 return FALSE;
137 }
138