Jamoma API  0.6.0.a19
MatrixMixerVolumes.cpp
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41 #include "MatrixMixerVolumes.h"
42 #include "CAXException.h"
43 
44 OSStatus NumberChannels (AudioUnit au,
45  AudioUnitScope inScope,
46  AudioUnitElement inEl,
47  UInt32 &outChans);
48 
49 
50 OSStatus PrintBuses (FILE* file, char* str, AudioUnit au, AudioUnitScope inScope)
51 {
52  OSStatus result;
53  UInt32 busCount;
54  UInt32 theSize = sizeof(busCount);
55 
56  ca_require_noerr (result = AudioUnitGetProperty (au, kAudioUnitProperty_ElementCount,
57  inScope, 0, &busCount, &theSize), home);
58 
59  fprintf (file, "\t%s Elements:\n\t\t", str);
60  for (UInt32 i = 0; i < busCount; ++i) {
61  Float32 val;
62  ca_require_noerr (result = AudioUnitGetParameter (au, kMatrixMixerParam_Enable, inScope, i, &val), home);
63  UInt32 numChans;
64  ca_require_noerr (result = NumberChannels (au, inScope, i, numChans), home);
65  char frameCharStart = (val != 0 ? '[' : '{');
66  char frameCharEnd = (val != 0 ? ']' : '}');
67  fprintf (file, "%d:%c%d, %c%c ", (int)i, frameCharStart, (int)numChans, (val != 0 ? 'T' : 'F'), frameCharEnd);
68  }
69  fprintf (file, "\n");
70 home:
71  return result;
72 }
73 
74 void PrintMatrixMixerVolumes (FILE* file, AudioUnit au)
75 {
76  UInt32 dims[2];
77  UInt32 theSize = sizeof(UInt32) * 2;
78  Float32 *theVols = NULL;
79  OSStatus result;
80 
81 // this call will fail if the unit is NOT initialized as it would present an incomplete state
82  ca_require_noerr (result = AudioUnitGetProperty (au, kAudioUnitProperty_MatrixDimensions,
83  kAudioUnitScope_Global, 0, dims, &theSize), home);
84 
85  theSize = ((dims[0] + 1) * (dims[1] + 1)) * sizeof(Float32);
86 
87  theVols = static_cast<Float32*> (malloc (theSize));
88 
89  ca_require_noerr (result = AudioUnitGetProperty (au, kAudioUnitProperty_MatrixLevels,
90  kAudioUnitScope_Global, 0, theVols, &theSize), home);
91 
92 home:
93  if (result) {
94  if (theVols)
95  free(theVols);
96  return;
97  }
98 
99  theSize /= sizeof(Float32);
100 
101  unsigned int inputs = dims[0];
102  unsigned int outputs = dims[1];
103 
104  fprintf (file, "\tInput Channels = %d, Output Channels = %d\n", (int)dims[0], (int)dims[1]);
105  PrintBuses (file, "Input", au, kAudioUnitScope_Input);
106  PrintBuses (file, "Output", au, kAudioUnitScope_Output);
107  fprintf (file, "\tGlobal Volume: %.3f\n", theVols [theSize - 1]);
108  for (unsigned int i = 0; i < (inputs + 1); ++i) {
109  if (i < inputs) {
110  fprintf (file, "\t%.3f ", theVols[(i + 1) * (outputs + 1) - 1]);
111 
112  for (unsigned int j = 0; j < outputs; ++j)
113  fprintf (file, "(%.3f) ", theVols[(i * (outputs + 1)) + j]);
114  } else {
115  fprintf (file, "\t ");
116  for (unsigned int j = 0; j < outputs; ++j)
117  fprintf (file, " %.3f ", theVols[(i * (outputs + 1)) + j]);
118  }
119  fprintf (file, "\n");
120  }
121 
122 #if 0
123  for (unsigned int i = 0; i < theSize; ++i)
124  printf ("%f, ", theVols[i]);
125 #endif
126  free(theVols);
127 }
128 
129 // Utility routine that gets the number of channels from an audio unit
130 OSStatus NumberChannels (AudioUnit au,
131  AudioUnitScope inScope,
132  AudioUnitElement inEl,
133  UInt32 &outChans)
134 {
135  AudioStreamBasicDescription desc;
136  UInt32 dataSize = sizeof (AudioStreamBasicDescription);
137  OSStatus result = AudioUnitGetProperty (au, kAudioUnitProperty_StreamFormat,
138  inScope, inEl,
139  &desc, &dataSize);
140  if (!result)
141  outChans = desc.mChannelsPerFrame;
142  return result;
143 }