1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
//
// AudioUnitEventArgs.cs: AudioUnit callback argument
//
// Author:
// AKIHIRO Uehara (u-akihiro@reinforce-lab.com)
//
// Copyright 2010 Reinforce Lab.
//
// 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.
//
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using MonoMac.AudioToolbox;
using MonoMac.Foundation;
namespace MonoMac.AudioUnit
{
public static class AudioUnitUtils
{
public const int SampleFractionBits = 24;
[Advice ("Use AudioStreamBasicDescription::CreateLinearPCM instead")]
public static AudioStreamBasicDescription AUCanonicalASBD(double sampleRate, int channel)
{
// setting AudioStreamBasicDescription
int AudioUnitSampleTypeSize =
#if !MONOMAC
(MonoMac.ObjCRuntime.Runtime.Arch == MonoTouch.ObjCRuntime.Arch.SIMULATOR) ? sizeof(float) : sizeof(int);
#else
sizeof (float);
#endif
AudioStreamBasicDescription audioFormat = new AudioStreamBasicDescription()
{
SampleRate = sampleRate,
Format = AudioFormatType.LinearPCM,
//kAudioFormatFlagsAudioUnitCanonical = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked | kAudioFormatFlagIsNonInterleaved | (SampleFractionBits << kLinearPCMFormatFlagsSampleFractionShift),
FormatFlags = (AudioFormatFlags)((int)AudioFormatFlags.IsSignedInteger | (int)AudioFormatFlags.IsPacked | (int)AudioFormatFlags.IsNonInterleaved | (int)(SampleFractionBits << (int)AudioFormatFlags.LinearPCMSampleFractionShift)),
ChannelsPerFrame = channel,
BytesPerPacket = AudioUnitSampleTypeSize,
BytesPerFrame = AudioUnitSampleTypeSize,
FramesPerPacket = 1,
BitsPerChannel = 8 * AudioUnitSampleTypeSize,
Reserved = 0
};
return audioFormat;
}
[Advice ("Use AudioSession::OverrideCategoryDefaultToSpeaker instead")]
public static void SetOverrideCategoryDefaultToSpeaker(bool isSpeaker)
{
int val = isSpeaker ? 1 : 0;
int err = AudioSessionSetProperty(
0x6373706b, //'cspk'
(UInt32)sizeof(UInt32),
ref val);
if (err != 0)
throw new ArgumentException();
}
[DllImport(MonoMac.Constants.AudioToolboxLibrary, EntryPoint = "AudioSessionSetProperty")]
static extern int AudioSessionSetProperty(
UInt32 inID,
UInt32 inDataSize,
ref int inData);
}
}
|