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1/* Copyright: � Copyright 2005 Apple Computer, Inc. All rights reserved.
2
3 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
4 ("Apple") in consideration of your agreement to the following terms, and your
5 use, installation, modification or redistribution of this Apple software
6 constitutes acceptance of these terms. If you do not agree with these terms,
7 please do not use, install, modify or redistribute this Apple software.
8
9 In consideration of your agreement to abide by the following terms, and subject
10 to these terms, Apple grants you a personal, non-exclusive license, under Apple�s
11 copyrights in this original Apple software (the "Apple Software"), to use,
12 reproduce, modify and redistribute the Apple Software, with or without
13 modifications, in source and/or binary forms; provided that if you redistribute
14 the Apple Software in its entirety and without modifications, you must retain
15 this notice and the following text and disclaimers in all such redistributions of
16 the Apple Software. Neither the name, trademarks, service marks or logos of
17 Apple Computer, Inc. may be used to endorse or promote products derived from the
18 Apple Software without specific prior written permission from Apple. Except as
19 expressly stated in this notice, no other rights or licenses, express or implied,
20 are granted by Apple herein, including but not limited to any patent rights that
21 may be infringed by your derivative works or by other works in which the Apple
22 Software may be incorporated.
23
24 The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
25 WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
26 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
27 PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
28 COMBINATION WITH YOUR PRODUCTS.
29
30 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
32 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
34 OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
35 (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
36 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37*/
38/*=============================================================================
39 CAChannelMapper.cpp
40
41=============================================================================*/
42
43#include "CAChannelMapper.h"
44#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
45 #include <AudioToolbox/AudioToolbox.h>
46#else
47 #include <AudioToolbox.h>
48#endif
49
50static void DefaultChannelLayout(CAAudioChannelLayout &layout, UInt32 nchannels)
51{
52 // we really can't do a sensible downmix without valid source/destination channel layouts
53 if (nchannels == 1)
54 layout = CAAudioChannelLayout(kAudioChannelLayoutTag_Mono);
55 else if (nchannels == 2)
56 layout = CAAudioChannelLayout(kAudioChannelLayoutTag_Stereo);
57}
58
59CAChannelMapper::CAChannelMapper( const CAStreamBasicDescription &srcFormat,
60 const CAStreamBasicDescription &destFormat,
61 const CAAudioChannelLayout * inSrcLayout,
62 const CAAudioChannelLayout * inDestLayout) :
63 mSrcNChannels(srcFormat.mChannelsPerFrame),
64 mDestNChannels(destFormat.mChannelsPerFrame)
65{
66 if (inSrcLayout && inSrcLayout->IsValid())
67 mSrcLayout = *inSrcLayout;
68 else
69 DefaultChannelLayout(mSrcLayout, srcFormat.mChannelsPerFrame);
70
71 if (inDestLayout && inDestLayout->IsValid())
72 mDestLayout = *inDestLayout;
73 else
74 DefaultChannelLayout(mDestLayout, destFormat.mChannelsPerFrame);
75}
76
77CAChannelMapper::~CAChannelMapper()
78{
79 if (mMatrixMixer)
80 CloseComponent(mMatrixMixer);
81}
82
83OSStatus CAChannelMapper::OpenMixer(double sampleRate)
84{
85 CAComponent comp(kAudioUnitType_Mixer, kAudioUnitSubType_MatrixMixer, kAudioUnitManufacturer_Apple);
86 OSStatus err;
87
88 err = CAAudioUnit::Open(comp, mMatrixMixer);
89 if (err) return err;
90
91 CAStreamBasicDescription fmt;
92 fmt.mSampleRate = sampleRate;
93 UInt32 nbuses = 1;
94
95 err = mMatrixMixer.SetProperty(kAudioUnitProperty_BusCount, kAudioUnitScope_Input, 0, &nbuses, sizeof(UInt32));
96 if (err) return err;
97 err = mMatrixMixer.SetProperty(kAudioUnitProperty_BusCount, kAudioUnitScope_Output, 0, &nbuses, sizeof(UInt32));
98 if (err) return err;
99
100 fmt.SetCanonical(mSrcNChannels, false);
101 err = mMatrixMixer.SetFormat(kAudioUnitScope_Input, 0, fmt);
102 if (err) return err;
103
104 fmt.SetCanonical(mDestNChannels, false);
105 err = mMatrixMixer.SetFormat(kAudioUnitScope_Output, 0, fmt);
106 if (err) return err;
107
108 // set render callback
109 AURenderCallbackStruct input;
110 input.inputProc = MixerInputProc;
111 input.inputProcRefCon = this;
112 err = mMatrixMixer.SetProperty(
113 kAudioUnitProperty_SetRenderCallback,
114 kAudioUnitScope_Global,
115 0,
116 &input,
117 sizeof(input));
118
119 err = mMatrixMixer.Initialize();
120 if (err) return err;
121
122 return ResetMixer();
123}
124
125OSStatus CAChannelMapper::ResetMixer()
126{
127 int nin = mSrcNChannels, nout = mDestNChannels;
128 int i, j;
129
130 // set global, input and output volumes
131 mMatrixMixer.SetParameter(kMatrixMixerParam_Volume, kAudioUnitScope_Global, 0xFFFFFFFF, 1.);
132 for (i = 0; i < nout; ++i) {
133 mMatrixMixer.SetParameter(kMatrixMixerParam_Volume, kAudioUnitScope_Global, 0xFFFF0000 | i, 1.);
134 }
135 for (i = 0; i < nin; ++i) {
136 mMatrixMixer.SetParameter(kMatrixMixerParam_Volume, kAudioUnitScope_Global, (i<<16) | 0xFFFF, 1.);
137 }
138 // set crosspoint volumes
139 for (i = 0; i < nin; ++i) {
140 for (j = 0; j < nout; ++j) {
141 mMatrixMixer.SetParameter(kMatrixMixerParam_Volume, kAudioUnitScope_Global, (i<<16) | j, 0.);
142 }
143 }
144 return noErr;
145}
146
147OSStatus CAChannelMapper::ConfigureDownmix()
148{
149 OSStatus err = ResetMixer();
150 if (err)
151 return err;
152
153 const AudioChannelLayout *layouts[] = { &mSrcLayout.Layout(), &mDestLayout.Layout() };
154 UInt32 propSize;
155 err = AudioFormatGetPropertyInfo(kAudioFormatProperty_MatrixMixMap, sizeof(layouts), layouts, &propSize);
156 if (err)
157 return err;
158
159 void *mixmap = malloc(propSize);
160 err = AudioFormatGetProperty(kAudioFormatProperty_MatrixMixMap, sizeof(layouts), layouts, &propSize, mixmap);
161 if (!err) {
162 mMatrixMixer.SetParameter(kMatrixMixerParam_Volume, kAudioUnitScope_Global, 0xFFFFFFFF, 1.);
163 int nin = mSrcNChannels, nout = mDestNChannels;
164 int i, j;
165 // set the crosspoint volumes
166 Float32 *val = (Float32 *)mixmap;
167 for (i = 0; i < nin; ++i) {
168 for (j = 0; j < nout; ++j) {
169 mMatrixMixer.SetParameter(kMatrixMixerParam_Volume, kAudioUnitScope_Global, (i<<16) | j, *val++);
170 }
171 }
172 }
173 free(mixmap);
174 return noErr;
175}
176
177OSStatus CAChannelMapper::ConnectChannelToChannel(UInt32 inChannel, UInt32 outChannel)
178{
179 return mMatrixMixer.SetParameter(kMatrixMixerParam_Volume, kAudioUnitScope_Global,
180 (inChannel << 16) | outChannel, 1.);
181}
182
183OSStatus CAChannelMapper::Mix(const AudioBufferList *src, AudioBufferList *dest, UInt32 nFrames)
184{
185 mMixInputBufferList = src;
186 AudioUnitRenderActionFlags flags = 0;
187 AudioTimeStamp ts;
188 ts.mFlags = 0;
189 return AudioUnitRender(mMatrixMixer.AU(), &flags, &ts, 0, nFrames, dest);
190}
191
192OSStatus CAChannelMapper::MixerInputProc(
193 void * inRefCon,
194 AudioUnitRenderActionFlags *ioActionFlags,
195 const AudioTimeStamp * inTimeStamp,
196 UInt32 inBusNumber,
197 UInt32 inNumberFrames,
198 AudioBufferList * ioData)
199{
200 CAChannelMapper *This = static_cast<CAChannelMapper *>(inRefCon);
201 const AudioBufferList *mixInputBufferList = This->mMixInputBufferList;
202 UInt32 copySize = sizeof(UInt32) + (mixInputBufferList->mNumberBuffers * sizeof(AudioBuffer));
203 memcpy(ioData, mixInputBufferList, copySize);
204
205 return noErr;
206}