/*
File: CAStreamBasicDescription.cpp
Abstract: Helper class for audio stream descriptions
Version: 2.0
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IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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*/
#include "CAStreamBasicDescription.h"
#include "CAMath.h"
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
#include <CoreFoundation/CFByteOrder.h>
#else
#include <CFByteOrder.h>
#endif
#if TARGET_OS_WIN32
#include <stddef.h>
#endif
#pragma mark This file needs to compile on earlier versions of the OS, so please keep that in mind when editing it
const AudioStreamBasicDescription CAStreamBasicDescription::sEmpty = { 0.0, 0, 0, 0, 0, 0, 0, 0, 0 };
CAStreamBasicDescription::CAStreamBasicDescription(double inSampleRate, UInt32 inFormatID,
UInt32 inBytesPerPacket, UInt32 inFramesPerPacket,
UInt32 inBytesPerFrame, UInt32 inChannelsPerFrame,
UInt32 inBitsPerChannel, UInt32 inFormatFlags)
{
mSampleRate = inSampleRate;
mFormatID = inFormatID;
mBytesPerPacket = inBytesPerPacket;
mFramesPerPacket = inFramesPerPacket;
mBytesPerFrame = inBytesPerFrame;
mChannelsPerFrame = inChannelsPerFrame;
mBitsPerChannel = inBitsPerChannel;
mFormatFlags = inFormatFlags;
mReserved = 0;
}
char *CAStreamBasicDescription::AsString(char *buf, size_t bufsize) const
{
char *theBuffer = buf;
int nc;
char formatID[5];
*(UInt32 *)formatID = CFSwapInt32HostToBig(mFormatID);
formatID[4] = '\0';
nc = snprintf(buf, bufsize, "%2d ch, %6.0f Hz, '%-4.4s' (0x%08X) ", (int)NumberChannels(), mSampleRate, formatID, (int)mFormatFlags);
buf += nc; bufsize -= nc;
if (mFormatID == kAudioFormatLinearPCM)
{
bool isInt = !(mFormatFlags & kLinearPCMFormatFlagIsFloat);
int wordSize = SampleWordSize();
const char *endian = (wordSize > 1) ?
((mFormatFlags & kLinearPCMFormatFlagIsBigEndian) ? " big-endian" : " little-endian" ) : "";
const char *sign = isInt ?
((mFormatFlags & kLinearPCMFormatFlagIsSignedInteger) ? " signed" : " unsigned") : "";
const char *floatInt = isInt ? "integer" : "float";
char packed[32];
if (wordSize > 0 && PackednessIsSignificant())
{
if (mFormatFlags & kLinearPCMFormatFlagIsPacked)
sprintf(packed, "packed in %d bytes", wordSize);
else
sprintf(packed, "unpacked in %d bytes", wordSize);
} else
packed[0] = '\0';
const char *align = (wordSize > 0 && AlignmentIsSignificant()) ?
((mFormatFlags & kLinearPCMFormatFlagIsAlignedHigh) ? " high-aligned" : " low-aligned") : "";
const char *deinter = (mFormatFlags & kAudioFormatFlagIsNonInterleaved) ? ", deinterleaved" : "";
const char *commaSpace = (packed[0]!='\0') || (align[0]!='\0') ? ", " : "";
char bitdepth[20];
#if CA_PREFER_FIXED_POINT
int fracbits = (mFormatFlags & kLinearPCMFormatFlagsSampleFractionMask) >> kLinearPCMFormatFlagsSampleFractionShift;
if (fracbits > 0)
sprintf(bitdepth, "%d.%d", (int)mBitsPerChannel - fracbits, fracbits);
else
#endif
sprintf(bitdepth, "%d", (int)mBitsPerChannel);
nc = snprintf(buf, bufsize, "%s-bit%s%s %s%s%s%s%s",
bitdepth, endian, sign, floatInt,
commaSpace, packed, align, deinter);
//buf += nc; bufsize -= nc;
} else if (mFormatID == 'alac') { // kAudioFormatAppleLossless
int sourceBits = 0;
switch (mFormatFlags)
{
case 1: // kAppleLosslessFormatFlag_16BitSourceData
sourceBits = 16;
break;
case 2: // kAppleLosslessFormatFlag_20BitSourceData
sourceBits = 20;
break;
case 3: // kAppleLosslessFormatFlag_24BitSourceData
sourceBits = 24;
break;
case 4: // kAppleLosslessFormatFlag_32BitSourceData
sourceBits = 32;
break;
}
if (sourceBits)
nc = snprintf(buf, bufsize, "from %d-bit source, ", sourceBits);
else
nc = snprintf(buf, bufsize, "from UNKNOWN source bit depth, ");
buf += nc; bufsize -= nc;
nc = snprintf(buf, bufsize, "%d frames/packet", (int)mFramesPerPacket);
//buf += nc; bufsize -= nc;
}
else
nc = snprintf(buf, bufsize, "%d bits/channel, %d bytes/packet, %d frames/packet, %d bytes/frame",
(int)mBitsPerChannel, (int)mBytesPerPacket, (int)mFramesPerPacket, (int)mBytesPerFrame);
return theBuffer;
}
void CAStreamBasicDescription::NormalizeLinearPCMFormat(AudioStreamBasicDescription& ioDescription)
{
// the only thing that changes is to make mixable linear PCM into the canonical linear PCM format
if((ioDescription.mFormatID == kAudioFormatLinearPCM) && ((ioDescription.mFormatFlags & kIsNonMixableFlag) == 0))
{
// the canonical linear PCM format
ioDescription.mFormatFlags = kAudioFormatFlagsCanonical;
ioDescription.mBytesPerPacket = sizeof(AudioSampleType) * ioDescription.mChannelsPerFrame;
ioDescription.mFramesPerPacket = 1;
ioDescription.mBytesPerFrame = sizeof(AudioSampleType) * ioDescription.mChannelsPerFrame;
ioDescription.mBitsPerChannel = 8 * sizeof(AudioSampleType);
}
}
void CAStreamBasicDescription::ResetFormat(AudioStreamBasicDescription& ioDescription)
{
ioDescription.mSampleRate = 0;
ioDescription.mFormatID = 0;
ioDescription.mBytesPerPacket = 0;
ioDescription.mFramesPerPacket = 0;
ioDescription.mBytesPerFrame = 0;
ioDescription.mChannelsPerFrame = 0;
ioDescription.mBitsPerChannel = 0;
ioDescription.mFormatFlags = 0;
}
void CAStreamBasicDescription::FillOutFormat(AudioStreamBasicDescription& ioDescription, const AudioStreamBasicDescription& inTemplateDescription)
{
if(fiszero(ioDescription.mSampleRate))
{
ioDescription.mSampleRate = inTemplateDescription.mSampleRate;
}
if(ioDescription.mFormatID == 0)
{
ioDescription.mFormatID = inTemplateDescription.mFormatID;
}
if(ioDescription.mFormatFlags == 0)
{
ioDescription.mFormatFlags = inTemplateDescription.mFormatFlags;
}
if(ioDescription.mBytesPerPacket == 0)
{
io
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