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livetrax/libs/appleutility/CoreAudio/AudioCodecs/ACPublic/ACSimpleCodec.cpp

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/*
File: ACSimpleCodec.cpp
Abstract: ACSimpleCodec.h
Version: 1.1
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*/
//=============================================================================
// Includes
//=============================================================================
#include "ACSimpleCodec.h"
#include <string.h>
//=============================================================================
// ACSimpleCodec
//=============================================================================
static const UInt32 kBufferPad = 64; // this is used to prevent end from passing start.
ACSimpleCodec::ACSimpleCodec(UInt32 inInputBufferByteSize, AudioComponentInstance inInstance)
:
ACBaseCodec(inInstance),
mInputBuffer(NULL),
mInputBufferByteSize(inInputBufferByteSize+kBufferPad),
mInputBufferStart(0),
mInputBufferEnd(0)
{
}
ACSimpleCodec::~ACSimpleCodec()
{
delete[] mInputBuffer;
}
void ACSimpleCodec::Initialize(const AudioStreamBasicDescription* inInputFormat, const AudioStreamBasicDescription* inOutputFormat, const void* inMagicCookie, UInt32 inMagicCookieByteSize)
{
ReallocateInputBuffer(mInputBufferByteSize - kBufferPad);
// By definition CBR has this greater than 0. We must avoid a div by 0 error in AppendInputData()
// Note this will cause us to fail initialization which is intended
if (mInputFormat.mBytesPerPacket == 0)
{
CODEC_THROW(kAudioCodecUnsupportedFormatError);
}
ACBaseCodec::Initialize(inInputFormat, inOutputFormat, inMagicCookie, inMagicCookieByteSize);
}
void ACSimpleCodec::Uninitialize()
{
// get rid of the buffer
delete[] mInputBuffer;
mInputBuffer = NULL;
// reset the ring buffer state
mInputBufferStart = 0;
mInputBufferEnd = 0;
ACBaseCodec::Uninitialize();
}
void ACSimpleCodec::Reset()
{
// clear the entire input buffer
if (mInputBuffer) { // could be called before allocated.
memset(mInputBuffer, 0, mInputBufferByteSize);
}
// reset the ring buffer state
mInputBufferStart = 0;
mInputBufferEnd = 0;
ACBaseCodec::Reset();
}
UInt32 ACSimpleCodec::GetInputBufferByteSize() const
{
return mInputBufferByteSize - kBufferPad; // minus kBufferPad to prevent end moving past start
}
UInt32 ACSimpleCodec::GetUsedInputBufferByteSize() const
{
UInt32 theAnswer = 0;
// this object uses a ring buffer
if(mInputBufferStart <= mInputBufferEnd)
{
// the active region is contiguous
theAnswer = mInputBufferEnd - mInputBufferStart;
}
else
{
// the active region wraps around
theAnswer = (mInputBufferByteSize - mInputBufferStart) + mInputBufferEnd;
}
return theAnswer;
}
void ACSimpleCodec::AppendInputData(const void* inInputData, UInt32& ioInputDataByteSize, UInt32& ioNumberPackets, const AudioStreamPacketDescription* inPacketDescription)
{
// this buffer handling code doesn't care about such things as the packet descriptions
if(!mIsInitialized) CODEC_THROW(kAudioCodecStateError);
// this is a ring buffer we're dealing with, so we need to set up a few things
UInt32 theUsedByteSize = GetUsedInputBufferByteSize();
UInt32 theAvailableByteSize = GetInputBufferByteSize() - theUsedByteSize;
UInt32 theMaxAvailableInputBytes = ioInputDataByteSize; // we can't consume more than we get
const Byte* theInputData = static_cast<const Byte*>(inInputData);
// >>jamesmcc: added this because ioNumberPackets was not being updated if less was taken than given.
// THIS ASSUMES CBR!
UInt32 bytesPerPacketOfInput = mInputFormat.mBytesPerPacket;
UInt32 theAvailablePacketSize = theAvailableByteSize / bytesPerPacketOfInput;
UInt32 minPacketSize = ioNumberPackets < theAvailablePacketSize ? ioNumberPackets : theAvailablePacketSize;
UInt32 minByteSize = minPacketSize * bytesPerPacketOfInput;
// we can copy only as much data as there is or up to how much space is availiable
ioNumberPackets = minPacketSize;
ioInputDataByteSize = minByteSize;
// ioInputDataByteSize had better be <= to theMaxAvailableInputBytes or we're screwed
if (ioInputDataByteSize > theMaxAvailableInputBytes)
{
CODEC_THROW(kAudioCodecStateError);
}
// <<jamesmcc
// now we have to copy the data taking into account the wrap around and where the start is
if(mInputBufferEnd + ioInputDataByteSize < mInputBufferByteSize)
{
// no wrap around here
memcpy(mInputBuffer + mInputBufferEnd, theInputData, ioInputDataByteSize);
// adjust the end point
mInputBufferEnd += ioInputDataByteSize;
}
else
{
// the copy will wrap
// copy the first part
UInt32 theBeforeWrapByteSize = mInputBufferByteSize - mInputBufferEnd;
memcpy(mInputBuffer + mInputBufferEnd, theInputData, theBeforeWrapByteSize);
// and the rest
UInt32 theAfterWrapByteSize = ioInputDataByteSize - theBeforeWrapByteSize;
memcpy(mInputBuffer, theInputData + theBeforeWrapByteSize, theAfterWrapByteSize);
// adjust the end point
mInputBufferEnd = theAfterWrapByteSize;
}
}
void ACSimpleCodec::ZeroPadInputData(UInt32& ioNumberPackets, const AudioStreamPacketDescription* inPacketDescription)
{
// this buffer handling code doesn't care about such things as the packet descriptions
if(!mIsInitialized) CODEC_THROW(kAudioCodecStateError);
// this is a ring buffer we're dealing with, so we need to set up a few things
UInt32 theUsedByteSize = GetUsedInputBufferByteSize();
UInt32 theAvailableByteSize = GetInputBufferByteSize() - theUsedByteSize;
// >>jamesmcc: added this because ioNumberPackets was not being updated if less was taken than given.
// THIS ASSUMES CBR!
UInt32 bytesPerPacketOfInput = mInputFormat.mBytesPerPacket;
UInt32 theAvailablePacketSize = theAvailableByteSize / bytesPerPacketOfInput;
UInt32 minPacketSize = ioNumberPackets < theAvailablePacketSize ? ioNumberPackets : theAvailablePacketSize;
UInt32 minByteSize = minPacketSize * bytesPerPacketOfInput;
// we can copy only as much data as there is or up to how much space is availiable
ioNumberPackets = minPacketSize;
// <<jamesmcc
// now we have to copy the data taking into account the wrap around and where the start is
if(mInputBufferEnd + minByteSize < mInputBufferByteSize)
{
// no wrap around here
memset(mInputBuffer + mInputBufferEnd, 0, minByteSize);
// adjust the end point
mInputBufferEnd += minByteSize;
}
else
{
// the copy will wrap
// copy the first part
UInt32 theBeforeWrapByteSize = mInputBufferByteSize - mInputBufferEnd;
memset(mInputBuffer + mInputBufferEnd, 0, theBeforeWrapByteSize);
// and the rest
UInt32 theAfterWrapByteSize = minByteSize - theBeforeWrapByteSize;
memset(mInputBuffer, 0, theAfterWrapByteSize);
// adjust the end point
mInputBufferEnd = theAfterWrapByteSize;
}
}
void ACSimpleCodec::ConsumeInputData(UInt32 inConsumedByteSize)
{
// this is a convenience routine to make maintaining the ring buffer state easy
UInt32 theContiguousRange = GetInputBufferContiguousByteSize();
if(inConsumedByteSize > GetUsedInputBufferByteSize()) CODEC_THROW(kAudioCodecUnspecifiedError);
if(inConsumedByteSize <= theContiguousRange)
{
// the region to consume doesn't wrap
// figure out how much to consume
inConsumedByteSize = (theContiguousRange < inConsumedByteSize) ? theContiguousRange : inConsumedByteSize;
// clear the consumed bits
memset(mInputBuffer + mInputBufferStart, 0, inConsumedByteSize);
// adjust the start
mInputBufferStart += inConsumedByteSize;
}
else
{
// the region to consume will wrap
// clear the bits to the end of the buffer
memset(mInputBuffer + mInputBufferStart, 0, theContiguousRange);
// now clear the bits left from the start
memset(mInputBuffer, 0, inConsumedByteSize - theContiguousRange);
// adjust the start
mInputBufferStart = inConsumedByteSize - theContiguousRange;
}
}
Byte* ACSimpleCodec::GetBytes(UInt32& ioNumberBytes) const
{
// if a client's algorithm has to have contiguous data and mInputBuffer wraps, then someone has to make a copy.
// I can do it more efficiently than the client.
if(!mIsInitialized) CODEC_THROW(kAudioCodecStateError);
UInt32 theUsedByteSize = GetUsedInputBufferByteSize();
//UInt32 theAvailableByteSize = GetInputBufferByteSize() - theUsedByteSize;
if (ioNumberBytes > theUsedByteSize) ioNumberBytes = theUsedByteSize;
SInt32 leftOver = mInputBufferStart + ioNumberBytes - mInputBufferByteSize;
if(leftOver > 0)
{
// need to copy beginning of buffer to the end.
// We cleverly over allocated our buffer space to make this possible.
memmove(mInputBuffer + mInputBufferByteSize, mInputBuffer, leftOver);
}
return GetInputBufferStart();
}
void ACSimpleCodec::ReallocateInputBuffer(UInt32 inInputBufferByteSize)
{
mInputBufferByteSize = inInputBufferByteSize + kBufferPad;
// toss the old buffer
delete[] mInputBuffer;
mInputBuffer = NULL;
// allocate the new one
// allocate extra in order to allow making contiguous data.
UInt32 allocSize = 2*inInputBufferByteSize + kBufferPad;
mInputBuffer = new Byte[allocSize];
memset(mInputBuffer, 0, allocSize);
// reset the ring buffer state
mInputBufferStart = 0;
mInputBufferEnd = 0;
}
void ACSimpleCodec::GetPropertyInfo(AudioCodecPropertyID inPropertyID, UInt32& outPropertyDataSize, Boolean& outWritable)
{
switch(inPropertyID)
{
case kAudioCodecPropertyInputBufferSize:
outPropertyDataSize = SizeOf32(UInt32);
outWritable = true;
break;
default:
ACBaseCodec::GetPropertyInfo(inPropertyID, outPropertyDataSize, outWritable);
break;
}
}
void ACSimpleCodec::SetProperty(AudioCodecPropertyID inPropertyID, UInt32 inPropertyDataSize, const void* inPropertyData)
{
switch(inPropertyID)
{
case kAudioCodecPropertyInputBufferSize:
if(inPropertyDataSize == sizeof(UInt32))
{
ReallocateInputBuffer(*reinterpret_cast<const UInt32*>(inPropertyData));
}
else
{
CODEC_THROW(kAudioCodecBadPropertySizeError);
}
break;
default:
ACBaseCodec::SetProperty(inPropertyID, inPropertyDataSize, inPropertyData);
break;
}
}