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47 #include "AUOutputBL.h"
48 #if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
49 #include <AudioUnit/AUComponent.h>
51 #include <AUComponent.h>
54 struct AudioBufferList
56 UInt32 mNumberBuffers;
57 AudioBuffer mBuffers[1];
61 UInt32 mNumberChannels; // number of interleaved channels in the buffer
62 UInt32 mDataByteSize; // the size of the buffer pointed to by mData
63 void* mData; // the pointer to the buffer
67 AUOutputBL::AUOutputBL (const CAStreamBasicDescription &inDesc, UInt32 inDefaultNumFrames)
71 mNumberBuffers (0), // keep this here, so can ensure integrity of ABL
73 mFrames(inDefaultNumFrames)
75 mNumberBuffers = mFormat.IsInterleaved() ? 1 : mFormat.NumberChannels();
76 mBufferList = reinterpret_cast<AudioBufferList*>(new Byte[offsetof(AudioBufferList, mBuffers) + (mNumberBuffers * sizeof(AudioBuffer))]);
79 AUOutputBL::~AUOutputBL()
82 delete[] mBufferMemory;
85 delete [] (Byte *)mBufferList;
88 void AUOutputBL::Prepare (UInt32 inNumFrames, bool inWantNullBufferIfAllocated)
90 UInt32 channelsPerBuffer = mFormat.IsInterleaved() ? mFormat.NumberChannels() : 1;
92 if (mBufferMemory == NULL || inWantNullBufferIfAllocated)
94 mBufferList->mNumberBuffers = mNumberBuffers;
95 AudioBuffer *buf = &mBufferList->mBuffers[0];
96 for (UInt32 i = 0; i < mNumberBuffers; ++i, ++buf) {
97 buf->mNumberChannels = channelsPerBuffer;
98 buf->mDataByteSize = mFormat.FramesToBytes (inNumFrames);
104 UInt32 nBytes = mFormat.FramesToBytes (inNumFrames);
105 if ((nBytes * mNumberBuffers) > AllocatedBytes())
106 throw OSStatus(kAudioUnitErr_TooManyFramesToProcess);
108 mBufferList->mNumberBuffers = mNumberBuffers;
109 AudioBuffer *buf = &mBufferList->mBuffers[0];
110 Byte* p = mBufferMemory;
111 for (UInt32 i = 0; i < mNumberBuffers; ++i, ++buf) {
112 buf->mNumberChannels = channelsPerBuffer;
113 buf->mDataByteSize = nBytes;
121 void AUOutputBL::Allocate (UInt32 inNumFrames)
125 UInt32 nBytes = mFormat.FramesToBytes (inNumFrames);
127 if (nBytes <= AllocatedBytes())
130 // align successive buffers for Altivec and to take alternating
131 // cache line hits by spacing them by odd multiples of 16
132 if (mNumberBuffers > 1)
133 nBytes = (nBytes + (0x10 - (nBytes & 0xF))) | 0x10;
135 mBufferSize = nBytes;
137 UInt32 memorySize = mBufferSize * mNumberBuffers;
138 Byte *newMemory = new Byte[memorySize];
139 memset(newMemory, 0, memorySize); // make buffer "hot"
141 Byte *oldMemory = mBufferMemory;
142 mBufferMemory = newMemory;
145 mFrames = inNumFrames;
150 delete [] mBufferMemory;
151 mBufferMemory = NULL;
159 void AUOutputBL::Print()
161 printf ("AUOutputBL::Print\n");
163 printf ("Num Buffers:%d, mFrames:%d, allocatedMemory:%c\n", (int)mBufferList->mNumberBuffers, (int)mFrames, (mBufferMemory != NULL ? 'T' : 'F'));
164 AudioBuffer *buf = &mBufferList->mBuffers[0];
165 for (UInt32 i = 0; i < mBufferList->mNumberBuffers; ++i, ++buf)
166 printf ("\tBuffer:%d, Size:%d, Chans:%d, Buffer:%p\n", (int)i, (int)buf->mDataByteSize, (int)buf->mNumberChannels, buf->mData);