1 /*
2 File: MatrixMixerVolumes.cpp
3 Abstract: MatrixMixerVolumes.h
4 Version: 1.1
5
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44 Copyright (C) 2014 Apple Inc. All Rights Reserved.
45
46 */
47 #include "MatrixMixerVolumes.h"
48 #include "CAXException.h"
49
50 OSStatus NumberChannels (AudioUnit au,
51 AudioUnitScope inScope,
52 AudioUnitElement inEl,
53 UInt32 &outChans);
54
55
PrintBuses(FILE * file,const char * str,AudioUnit au,AudioUnitScope inScope)56 OSStatus PrintBuses (FILE* file, const char* str, AudioUnit au, AudioUnitScope inScope)
57 {
58 OSStatus result;
59 UInt32 busCount;
60 UInt32 theSize = sizeof(busCount);
61
62 ca_require_noerr (result = AudioUnitGetProperty (au, kAudioUnitProperty_ElementCount,
63 inScope, 0, &busCount, &theSize), home);
64
65 fprintf (file, "\t%s Elements:\n\t\t", str);
66 for (UInt32 i = 0; i < busCount; ++i) {
67 Float32 val;
68 ca_require_noerr (result = AudioUnitGetParameter (au, kMatrixMixerParam_Enable, inScope, i, &val), home);
69 UInt32 numChans;
70 ca_require_noerr (result = NumberChannels (au, inScope, i, numChans), home);
71 char frameCharStart = (val != 0 ? '[' : '{');
72 char frameCharEnd = (val != 0 ? ']' : '}');
73 fprintf (file, "%d:%c%d, %c%c ", (int)i, frameCharStart, (int)numChans, (val != 0 ? 'T' : 'F'), frameCharEnd);
74 }
75 fprintf (file, "\n");
76 home:
77 return result;
78 }
79
PrintMatrixMixerVolumes(FILE * file,AudioUnit au)80 void PrintMatrixMixerVolumes (FILE* file, AudioUnit au)
81 {
82 UInt32 dims[2];
83 UInt32 theSize = sizeof(UInt32) * 2;
84 Float32 *theVols = NULL;
85 OSStatus result;
86
87 // this call will fail if the unit is NOT initialized as it would present an incomplete state
88 ca_require_noerr (result = AudioUnitGetProperty (au, kAudioUnitProperty_MatrixDimensions,
89 kAudioUnitScope_Global, 0, dims, &theSize), home);
90
91 theSize = ((dims[0] + 1) * (dims[1] + 1)) * sizeof(Float32);
92
93 theVols = static_cast<Float32*> (malloc (theSize));
94
95 ca_require_noerr (result = AudioUnitGetProperty (au, kAudioUnitProperty_MatrixLevels,
96 kAudioUnitScope_Global, 0, theVols, &theSize), home);
97
98 home:
99 if (result) {
100 if (theVols)
101 free(theVols);
102 return;
103 }
104
105 theSize /= sizeof(Float32);
106
107 unsigned int inputs = dims[0];
108 unsigned int outputs = dims[1];
109
110 fprintf (file, "\tInput Channels = %d, Output Channels = %d\n", (int)dims[0], (int)dims[1]);
111 PrintBuses (file, "Input", au, kAudioUnitScope_Input);
112 PrintBuses (file, "Output", au, kAudioUnitScope_Output);
113 fprintf (file, "\tGlobal Volume: %.3f\n", theVols [theSize - 1]);
114 for (unsigned int i = 0; i < (inputs + 1); ++i) {
115 if (i < inputs) {
116 fprintf (file, "\t%.3f ", theVols[(i + 1) * (outputs + 1) - 1]);
117
118 for (unsigned int j = 0; j < outputs; ++j)
119 fprintf (file, "(%.3f) ", theVols[(i * (outputs + 1)) + j]);
120 } else {
121 fprintf (file, "\t ");
122 for (unsigned int j = 0; j < outputs; ++j)
123 fprintf (file, " %.3f ", theVols[(i * (outputs + 1)) + j]);
124 }
125 fprintf (file, "\n");
126 }
127
128 #if 0
129 for (unsigned int i = 0; i < theSize; ++i)
130 printf ("%f, ", theVols[i]);
131 #endif
132 free(theVols);
133 }
134
135 // Utility routine that gets the number of channels from an audio unit
NumberChannels(AudioUnit au,AudioUnitScope inScope,AudioUnitElement inEl,UInt32 & outChans)136 OSStatus NumberChannels (AudioUnit au,
137 AudioUnitScope inScope,
138 AudioUnitElement inEl,
139 UInt32 &outChans)
140 {
141 AudioStreamBasicDescription desc;
142 UInt32 dataSize = sizeof (AudioStreamBasicDescription);
143 OSStatus result = AudioUnitGetProperty (au, kAudioUnitProperty_StreamFormat,
144 inScope, inEl,
145 &desc, &dataSize);
146 if (!result)
147 outChans = desc.mChannelsPerFrame;
148 return result;
149 }
150