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livetrax/libs/appleutility/CoreAudio/PublicUtility/CAStreamBasicDescription.cpp

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/*
File: CAStreamBasicDescription.cpp
Abstract: CAStreamBasicDescription.h
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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terms, and your use, installation, modification or redistribution of
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In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
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Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
#include "CAStreamBasicDescription.h"
#include "CAMath.h"
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
#include <CoreFoundation/CFByteOrder.h>
#else
#include <CFByteOrder.h>
#endif
#pragma mark This file needs to compile on earlier versions of the OS, so please keep that in mind when editing it
char *CAStringForOSType (OSType t, char *writeLocation, size_t bufsize)
{
if (bufsize > 0) {
char *p = writeLocation, *pend = writeLocation + bufsize;
union { UInt32 i; unsigned char str[4]; } u;
unsigned char *q = u.str;
u.i = CFSwapInt32HostToBig(t);
bool hasNonPrint = false;
for (int i = 0; i < 4; ++i) {
if (!(isprint(*q) && *q != '\\')) {
hasNonPrint = true;
break;
}
q++;
}
q = u.str;
if (hasNonPrint)
p += snprintf (p, pend - p, "0x");
else if (p < pend)
*p++ = '\'';
for (int i = 0; i < 4 && p < pend; ++i) {
if (hasNonPrint) {
p += snprintf(p, pend - p, "%02X", *q++);
} else {
*p++ = *q++;
}
}
if (!hasNonPrint && p < pend)
*p++ = '\'';
if (p >= pend) p -= 1;
*p = '\0';
}
return writeLocation;
}
const AudioStreamBasicDescription CAStreamBasicDescription::sEmpty = { 0.0, 0, 0, 0, 0, 0, 0, 0, 0 };
CAStreamBasicDescription::CAStreamBasicDescription()
{
memset (this, 0, sizeof(AudioStreamBasicDescription));
}
CAStreamBasicDescription::CAStreamBasicDescription(const AudioStreamBasicDescription &desc)
{
SetFrom(desc);
}
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, bool brief /*=false*/) const
{
int bufsize = (int)_bufsize; // must be signed to protect against overflow
char *theBuffer = buf;
int nc;
char formatID[24];
CAStringForOSType(mFormatID, formatID, sizeof(formatID));
if (brief) {
CommonPCMFormat com;
bool interleaved;
if (IdentifyCommonPCMFormat(com, &interleaved) && com != kPCMFormatOther) {
const char *desc;
switch (com) {
case kPCMFormatInt16:
desc = "Int16";
break;
case kPCMFormatFixed824:
desc = "Int8.24";
break;
case kPCMFormatFloat32:
desc = "Float32";
break;
case kPCMFormatFloat64:
desc = "Float64";
break;
default:
desc = NULL;
break;
}
if (desc) {
const char *inter ="";
if (mChannelsPerFrame > 1)
inter = !interleaved ? ", non-inter" : ", inter";
snprintf(buf, static_cast<size_t>(bufsize), "%2d ch, %6.0f Hz, %s%s", (int)mChannelsPerFrame, mSampleRate, desc, inter);
return theBuffer;
}
}
if (mChannelsPerFrame == 0 && mSampleRate == 0.0 && mFormatID == 0) {
snprintf(buf, static_cast<size_t>(bufsize), "%2d ch, %6.0f Hz", (int)mChannelsPerFrame, mSampleRate);
return theBuffer;
}
}
nc = snprintf(buf, static_cast<size_t>(bufsize), "%2d ch, %6.0f Hz, %s (0x%08X) ", (int)NumberChannels(), mSampleRate, formatID, (int)mFormatFlags);
buf += nc; if ((bufsize -= nc) <= 0) goto exit;
if (mFormatID == kAudioFormatLinearPCM) {
bool isInt = !(mFormatFlags & kLinearPCMFormatFlagIsFloat);
int wordSize = static_cast<int>(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)
snprintf(packed, sizeof(packed), "packed in %d bytes", wordSize);
else
snprintf(packed, sizeof(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];
int fracbits = (mFormatFlags & kLinearPCMFormatFlagsSampleFractionMask) >> kLinearPCMFormatFlagsSampleFractionShift;
if (fracbits > 0)
snprintf(bitdepth, sizeof(bitdepth), "%d.%d", (int)mBitsPerChannel - fracbits, fracbits);
else
snprintf(bitdepth, sizeof(bitdepth), "%d", (int)mBitsPerChannel);
/*nc =*/ snprintf(buf, static_cast<size_t>(bufsize), "%s-bit%s%s %s%s%s%s%s",
bitdepth, endian, sign, floatInt,
commaSpace, packed, align, deinter);
// buf += nc; if ((bufsize -= nc) <= 0) goto exit;
} else if (mFormatID == 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, static_cast<size_t>(bufsize), "from %d-bit source, ", sourceBits);
else
nc = snprintf(buf, static_cast<size_t>(bufsize), "from UNKNOWN source bit depth, ");
buf += nc; if ((bufsize -= nc) <= 0) goto exit;
/*nc =*/ snprintf(buf, static_cast<size_t>(bufsize), "%d frames/packet", (int)mFramesPerPacket);
// buf += nc; if ((bufsize -= nc) <= 0) goto exit;
}
else
/*nc =*/ snprintf(buf, static_cast<size_t>(bufsize), "%d bits/channel, %d bytes/packet, %d frames/packet, %d bytes/frame",
(int)mBitsPerChannel, (int)mBytesPerPacket, (int)mFramesPerPacket, (int)mBytesPerFrame);
exit:
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 = SizeOf32(AudioSampleType) * ioDescription.mChannelsPerFrame;
ioDescription.mFramesPerPacket = 1;
ioDescription.mBytesPerFrame = SizeOf32(AudioSampleType) * ioDescription.mChannelsPerFrame;
ioDescription.mBitsPerChannel = 8 * SizeOf32(AudioSampleType);
}
}
void CAStreamBasicDescription::NormalizeLinearPCMFormat(bool inNativeEndian, 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 = kAudioFormatFlagIsFloat | kAudioFormatFlagIsPacked;
if(inNativeEndian)
{
#if TARGET_RT_BIG_ENDIAN
ioDescription.mFormatFlags |= kAudioFormatFlagIsBigEndian;
#endif
}
else
{
#if TARGET_RT_LITTLE_ENDIAN
ioDescription.mFormatFlags |= kAudioFormatFlagIsBigEndian;
#endif
}
ioDescription.mBytesPerPacket = SizeOf32(AudioSampleType) * ioDescription.mChannelsPerFrame;
ioDescription.mFramesPerPacket = 1;
ioDescription.mBytesPerFrame = SizeOf32(AudioSampleType) * ioDescription.mChannelsPerFrame;
ioDescription.mBitsPerChannel = 8 * SizeOf32(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)
{
ioDescription.mBytesPerPacket = inTemplateDescription.mBytesPerPacket;
}
if(ioDescription.mFramesPerPacket == 0)
{
ioDescription.mFramesPerPacket = inTemplateDescription.mFramesPerPacket;
}
if(ioDescription.mBytesPerFrame == 0)
{
ioDescription.mBytesPerFrame = inTemplateDescription.mBytesPerFrame;
}
if(ioDescription.mChannelsPerFrame == 0)
{
ioDescription.mChannelsPerFrame = inTemplateDescription.mChannelsPerFrame;
}
if(ioDescription.mBitsPerChannel == 0)
{
ioDescription.mBitsPerChannel = inTemplateDescription.mBitsPerChannel;
}
}
void CAStreamBasicDescription::GetSimpleName(const AudioStreamBasicDescription& inDescription, char* outName, UInt32 inMaxNameLength, bool inAbbreviate, bool inIncludeSampleRate)
{
if(inIncludeSampleRate)
{
int theCharactersWritten = snprintf(outName, inMaxNameLength, "%.0f ", inDescription.mSampleRate);
outName += theCharactersWritten;
inMaxNameLength -= static_cast<UInt32>(theCharactersWritten);
}
switch(inDescription.mFormatID)
{
case kAudioFormatLinearPCM:
{
const char* theEndianString = NULL;
if((inDescription.mFormatFlags & kAudioFormatFlagIsBigEndian) != 0)
{
#if TARGET_RT_LITTLE_ENDIAN
theEndianString = "Big Endian";
#endif
}
else
{
#if TARGET_RT_BIG_ENDIAN
theEndianString = "Little Endian";
#endif
}
const char* theKindString = NULL;
if((inDescription.mFormatFlags & kAudioFormatFlagIsFloat) != 0)
{
theKindString = (inAbbreviate ? "Float" : "Floating Point");
}
else if((inDescription.mFormatFlags & kAudioFormatFlagIsSignedInteger) != 0)
{
theKindString = (inAbbreviate ? "SInt" : "Signed Integer");
}
else
{
theKindString = (inAbbreviate ? "UInt" : "Unsigned Integer");
}
const char* thePackingString = NULL;
if((inDescription.mFormatFlags & kAudioFormatFlagIsPacked) == 0)
{
if((inDescription.mFormatFlags & kAudioFormatFlagIsAlignedHigh) != 0)
{
thePackingString = "High";
}
else
{
thePackingString = "Low";
}
}
const char* theMixabilityString = NULL;
if((inDescription.mFormatFlags & kIsNonMixableFlag) == 0)
{
theMixabilityString = "Mixable";
}
else
{
theMixabilityString = "Unmixable";
}
if(inAbbreviate)
{
if(theEndianString != NULL)
{
if(thePackingString != NULL)
{
snprintf(outName, inMaxNameLength, "%s %d Ch %s %s %s%d/%s%d", theMixabilityString, (int)inDescription.mChannelsPerFrame, theEndianString, thePackingString, theKindString, (int)inDescription.mBitsPerChannel, theKindString, (int)(inDescription.mBytesPerFrame / inDescription.mChannelsPerFrame) * 8);
}
else
{
snprintf(outName, inMaxNameLength, "%s %d Ch %s %s%d", theMixabilityString, (int)inDescription.mChannelsPerFrame, theEndianString, theKindString, (int)inDescription.mBitsPerChannel);
}
}
else
{
if(thePackingString != NULL)
{
snprintf(outName, inMaxNameLength, "%s %d Ch %s %s%d/%s%d", theMixabilityString, (int)inDescription.mChannelsPerFrame, thePackingString, theKindString, (int)inDescription.mBitsPerChannel, theKindString, (int)((inDescription.mBytesPerFrame / inDescription.mChannelsPerFrame) * 8));
}
else
{
snprintf(outName, inMaxNameLength, "%s %d Ch %s%d", theMixabilityString, (int)inDescription.mChannelsPerFrame, theKindString, (int)inDescription.mBitsPerChannel);
}
}
}
else
{
if(theEndianString != NULL)
{
if(thePackingString != NULL)
{
snprintf(outName, inMaxNameLength, "%s %d Channel %d Bit %s %s Aligned %s in %d Bits", theMixabilityString, (int)inDescription.mChannelsPerFrame, (int)inDescription.mBitsPerChannel, theEndianString, theKindString, thePackingString, (int)(inDescription.mBytesPerFrame / inDescription.mChannelsPerFrame) * 8);
}
else
{
snprintf(outName, inMaxNameLength, "%s %d Channel %d Bit %s %s", theMixabilityString, (int)inDescription.mChannelsPerFrame, (int)inDescription.mBitsPerChannel, theEndianString, theKindString);
}
}
else
{
if(thePackingString != NULL)
{
snprintf(outName, inMaxNameLength, "%s %d Channel %d Bit %s Aligned %s in %d Bits", theMixabilityString, (int)inDescription.mChannelsPerFrame, (int)inDescription.mBitsPerChannel, theKindString, thePackingString, (int)(inDescription.mBytesPerFrame / inDescription.mChannelsPerFrame) * 8);
}
else
{
snprintf(outName, inMaxNameLength, "%s %d Channel %d Bit %s", theMixabilityString, (int)inDescription.mChannelsPerFrame, (int)inDescription.mBitsPerChannel, theKindString);
}
}
}
}
break;
case kAudioFormatAC3:
strlcpy(outName, "AC-3", sizeof(outName));
break;
case kAudioFormat60958AC3:
strlcpy(outName, "AC-3 for SPDIF", sizeof(outName));
break;
default:
CACopy4CCToCString(outName, inDescription.mFormatID);
break;
};
}
#if CoreAudio_Debug
#include "CALogMacros.h"
void CAStreamBasicDescription::PrintToLog(const AudioStreamBasicDescription& inDesc)
{
PrintFloat (" Sample Rate: ", inDesc.mSampleRate);
Print4CharCode (" Format ID: ", inDesc.mFormatID);
PrintHex (" Format Flags: ", inDesc.mFormatFlags);
PrintInt (" Bytes per Packet: ", inDesc.mBytesPerPacket);
PrintInt (" Frames per Packet: ", inDesc.mFramesPerPacket);
PrintInt (" Bytes per Frame: ", inDesc.mBytesPerFrame);
PrintInt (" Channels per Frame: ", inDesc.mChannelsPerFrame);
PrintInt (" Bits per Channel: ", inDesc.mBitsPerChannel);
}
#endif
bool operator<(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y)
{
bool theAnswer = false;
bool isDone = false;
// note that if either side is 0, that field is skipped
// format ID is the first order sort
if((!isDone) && ((x.mFormatID != 0) && (y.mFormatID != 0)))
{
if(x.mFormatID != y.mFormatID)
{
// formats are sorted numerically except that linear
// PCM is always first
if(x.mFormatID == kAudioFormatLinearPCM)
{
theAnswer = true;
}
else if(y.mFormatID == kAudioFormatLinearPCM)
{
theAnswer = false;
}
else
{
theAnswer = x.mFormatID < y.mFormatID;
}
isDone = true;
}
}
// mixable is always better than non-mixable for linear PCM and should be the second order sort item
if((!isDone) && ((x.mFormatID == kAudioFormatLinearPCM) && (y.mFormatID == kAudioFormatLinearPCM)))
{
if(((x.mFormatFlags & kIsNonMixableFlag) == 0) && ((y.mFormatFlags & kIsNonMixableFlag) != 0))
{
theAnswer = true;
isDone = true;
}
else if(((x.mFormatFlags & kIsNonMixableFlag) != 0) && ((y.mFormatFlags & kIsNonMixableFlag) == 0))
{
theAnswer = false;
isDone = true;
}
}
// floating point vs integer for linear PCM only
if((!isDone) && ((x.mFormatID == kAudioFormatLinearPCM) && (y.mFormatID == kAudioFormatLinearPCM)))
{
if((x.mFormatFlags & kAudioFormatFlagIsFloat) != (y.mFormatFlags & kAudioFormatFlagIsFloat))
{
// floating point is better than integer
theAnswer = y.mFormatFlags & kAudioFormatFlagIsFloat;
isDone = true;
}
}
// bit depth
if((!isDone) && ((x.mBitsPerChannel != 0) && (y.mBitsPerChannel != 0)))
{
if(x.mBitsPerChannel != y.mBitsPerChannel)
{
// deeper bit depths are higher quality
theAnswer = x.mBitsPerChannel < y.mBitsPerChannel;
isDone = true;
}
}
// sample rate
if((!isDone) && fnonzero(x.mSampleRate) && fnonzero(y.mSampleRate))
{
if(fnotequal(x.mSampleRate, y.mSampleRate))
{
// higher sample rates are higher quality
theAnswer = x.mSampleRate < y.mSampleRate;
isDone = true;
}
}
// number of channels
if((!isDone) && ((x.mChannelsPerFrame != 0) && (y.mChannelsPerFrame != 0)))
{
if(x.mChannelsPerFrame != y.mChannelsPerFrame)
{
// more channels is higher quality
theAnswer = x.mChannelsPerFrame < y.mChannelsPerFrame;
//isDone = true;
}
}
return theAnswer;
}
void CAStreamBasicDescription::ModifyFormatFlagsForMatching(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y, UInt32& xFlags, UInt32& yFlags, bool converterOnly )
{
// match wildcards
if (x.mFormatID == 0 || y.mFormatID == 0 || xFlags == 0 || yFlags == 0)
{
// Obliterate all flags.
xFlags = yFlags = 0;
return;
}
if (x.mFormatID == kAudioFormatLinearPCM) {
// knock off the all clear flag
xFlags = xFlags & ~kAudioFormatFlagsAreAllClear;
yFlags = yFlags & ~kAudioFormatFlagsAreAllClear;
// if both kAudioFormatFlagIsPacked bits are set, then we don't care about the kAudioFormatFlagIsAlignedHigh bit.
if (xFlags & yFlags & kAudioFormatFlagIsPacked) {
xFlags = xFlags & ~static_cast<UInt32>(kAudioFormatFlagIsAlignedHigh);
yFlags = yFlags & ~static_cast<UInt32>(kAudioFormatFlagIsAlignedHigh);
}
// if both kAudioFormatFlagIsFloat bits are set, then we don't care about the kAudioFormatFlagIsSignedInteger bit.
if (xFlags & yFlags & kAudioFormatFlagIsFloat) {
xFlags = xFlags & ~static_cast<UInt32>(kAudioFormatFlagIsSignedInteger);
yFlags = yFlags & ~static_cast<UInt32>(kAudioFormatFlagIsSignedInteger);
}
// if the bit depth is 8 bits or less and the format is packed, we don't care about endianness
if((x.mBitsPerChannel <= 8) && ((xFlags & kAudioFormatFlagIsPacked) == kAudioFormatFlagIsPacked))
{
xFlags = xFlags & ~static_cast<UInt32>(kAudioFormatFlagIsBigEndian);
}
if((y.mBitsPerChannel <= 8) && ((yFlags & kAudioFormatFlagIsPacked) == kAudioFormatFlagIsPacked))
{
yFlags = yFlags & ~static_cast<UInt32>(kAudioFormatFlagIsBigEndian);
}
// if the number of channels is 1, we don't care about non-interleavedness
if (x.mChannelsPerFrame == 1 && y.mChannelsPerFrame == 1) {
xFlags &= ~static_cast<UInt32>(kLinearPCMFormatFlagIsNonInterleaved);
yFlags &= ~static_cast<UInt32>(kLinearPCMFormatFlagIsNonInterleaved);
}
if (converterOnly) {
CAStreamBasicDescription cas_x = CAStreamBasicDescription(x);
CAStreamBasicDescription cas_y = CAStreamBasicDescription(y);
if (!cas_x.PackednessIsSignificant() && !cas_y.PackednessIsSignificant()) {
xFlags &= ~static_cast<UInt32>(kAudioFormatFlagIsPacked);
yFlags &= ~static_cast<UInt32>(kAudioFormatFlagIsPacked);
}
if (!cas_x.AlignmentIsSignificant() && !cas_y.AlignmentIsSignificant()) {
xFlags &= ~static_cast<UInt32>(kAudioFormatFlagIsAlignedHigh);
yFlags &= ~static_cast<UInt32>(kAudioFormatFlagIsAlignedHigh);
}
// We don't care about whether the streams are mixable in this case
xFlags &= ~static_cast<UInt32>(kAudioFormatFlagIsNonMixable);
yFlags &= ~static_cast<UInt32>(kAudioFormatFlagIsNonMixable);
}
}
}
static bool MatchFormatFlags(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y)
{
UInt32 xFlags = x.mFormatFlags;
UInt32 yFlags = y.mFormatFlags;
CAStreamBasicDescription::ModifyFormatFlagsForMatching(x, y, xFlags, yFlags, false);
return xFlags == yFlags;
}
bool operator==(const AudioStreamBasicDescription& x, const AudioStreamBasicDescription& y)
{
// the semantics for equality are:
// 1) Values must match exactly -- except for PCM format flags, see above.
// 2) wildcard's are ignored in the comparison
#define MATCH(name) ((x.name) == 0 || (y.name) == 0 || (x.name) == (y.name))
return
// check all but the format flags
CAStreamBasicDescription::FlagIndependentEquivalence(x, y)
// check the format flags
&& MatchFormatFlags(x, y);
}
bool CAStreamBasicDescription::FlagIndependentEquivalence(const AudioStreamBasicDescription &x, const AudioStreamBasicDescription &y)
{
return
// check the sample rate
(fiszero(x.mSampleRate) || fiszero(y.mSampleRate) || fequal(x.mSampleRate, y.mSampleRate))
// check the format ids
&& MATCH(mFormatID)
// check the bytes per packet
&& MATCH(mBytesPerPacket)
// check the frames per packet
&& MATCH(mFramesPerPacket)
// check the bytes per frame
&& MATCH(mBytesPerFrame)
// check the channels per frame
&& MATCH(mChannelsPerFrame)
// check the channels per frame
&& MATCH(mBitsPerChannel) ;
}
bool CAStreamBasicDescription::IsEqual(const AudioStreamBasicDescription &other, bool interpretingWildcards) const
{
if (interpretingWildcards)
return *this == other;
return memcmp(this, &other, offsetof(AudioStreamBasicDescription, mReserved)) == 0;
}
bool CAStreamBasicDescription::IsFunctionallyEquivalent(const AudioStreamBasicDescription &x, const AudioStreamBasicDescription &y)
{
UInt32 xFlags = x.mFormatFlags, yFlags = y.mFormatFlags;
CAStreamBasicDescription::ModifyFormatFlagsForMatching(x, y, xFlags, yFlags, true);
return
// check all but the format flags
CAStreamBasicDescription::FlagIndependentEquivalence(x, y)
// check the format flags with converter focus
&& (xFlags == yFlags);
}
bool SanityCheck(const AudioStreamBasicDescription& x)
{
// This function returns false if there are sufficiently insane values in any field.
// It is very conservative so even some very unlikely values will pass.
// This is just meant to catch the case where the data from a file is corrupted.
return
(x.mSampleRate >= 0.)
&& (x.mSampleRate < 3e6) // SACD sample rate is 2.8224 MHz
&& (x.mBytesPerPacket < 1000000)
&& (x.mFramesPerPacket < 1000000)
&& (x.mBytesPerFrame < 1000000)
&& (x.mChannelsPerFrame <= 1024)
&& (x.mBitsPerChannel <= 1024)
&& (x.mFormatID != 0)
&& !(x.mFormatID == kAudioFormatLinearPCM && (x.mFramesPerPacket != 1 || x.mBytesPerPacket != x.mBytesPerFrame));
}
bool CAStreamBasicDescription::FromText(const char *inTextDesc, AudioStreamBasicDescription &fmt)
{
const char *p = inTextDesc;
memset(&fmt, 0, sizeof(fmt));
bool isPCM = true; // until proven otherwise
UInt32 pcmFlags = kAudioFormatFlagIsPacked | kAudioFormatFlagIsSignedInteger;
if (p[0] == '-') // previously we required a leading dash on PCM formats
++p;
if (p[0] == 'B' && p[1] == 'E') {
pcmFlags |= kLinearPCMFormatFlagIsBigEndian;
p += 2;
} else if (p[0] == 'L' && p[1] == 'E') {
p += 2;
} else {
// default is native-endian
#if TARGET_RT_BIG_ENDIAN
pcmFlags |= kLinearPCMFormatFlagIsBigEndian;
#endif
}
if (p[0] == 'F') {
pcmFlags = (pcmFlags & ~static_cast<UInt32>(kAudioFormatFlagIsSignedInteger)) | kAudioFormatFlagIsFloat;
++p;
} else {
if (p[0] == 'U') {
pcmFlags &= ~static_cast<UInt32>(kAudioFormatFlagIsSignedInteger);
++p;
}
if (p[0] == 'I')
++p;
else {
// it's not PCM; presumably some other format (NOT VALIDATED; use AudioFormat for that)
isPCM = false;
p = inTextDesc; // go back to the beginning
char buf[4] = { ' ',' ',' ',' ' };
for (int i = 0; i < 4; ++i) {
if (*p != '\\') {
if ((buf[i] = *p++) == '\0') {
// special-case for 'aac'
if (i != 3) return false;
--p; // keep pointing at the terminating null
buf[i] = ' ';
break;
}
} else {
// "\xNN" is a hex byte
if (*++p != 'x') return false;
int x;
if (sscanf(++p, "%02X", &x) != 1) return false;
buf[i] = static_cast<char>(x);
p += 2;
}
}
if (strchr("-@/#", buf[3])) {
// further special-casing for 'aac'
buf[3] = ' ';
--p;
}
memcpy(&fmt.mFormatID, buf, 4);
fmt.mFormatID = CFSwapInt32BigToHost(fmt.mFormatID);
}
}
if (isPCM) {
fmt.mFormatID = kAudioFormatLinearPCM;
fmt.mFormatFlags = pcmFlags;
fmt.mFramesPerPacket = 1;
fmt.mChannelsPerFrame = 1;
UInt32 bitdepth = 0, fracbits = 0;
while (isdigit(*p))
bitdepth = 10 * bitdepth + static_cast<UInt32>(*p++ - '0');
if (*p == '.') {
++p;
if (!isdigit(*p)) {
fprintf(stderr, "Expected fractional bits following '.'\n");
goto Bail;
}
while (isdigit(*p))
fracbits = 10 * fracbits + static_cast<UInt32>(*p++ - '0');
bitdepth += fracbits;
fmt.mFormatFlags |= (fracbits << kLinearPCMFormatFlagsSampleFractionShift);
}
fmt.mBitsPerChannel = bitdepth;
fmt.mBytesPerPacket = fmt.mBytesPerFrame = (bitdepth + 7) / 8;
if (bitdepth & 7) {
// assume unpacked. (packed odd bit depths are describable but not supported in AudioConverter.)
fmt.mFormatFlags &= ~static_cast<UInt32>(kLinearPCMFormatFlagIsPacked);
// alignment matters; default to high-aligned. use ':L_' for low.
fmt.mFormatFlags |= kLinearPCMFormatFlagIsAlignedHigh;
}
}
if (*p == '@') {
++p;
while (isdigit(*p))
fmt.mSampleRate = 10 * fmt.mSampleRate + (*p++ - '0');
}
if (*p == '/') {
UInt32 flags = 0;
while (true) {
char c = *++p;
if (c >= '0' && c <= '9')
flags = (flags << 4) | static_cast<UInt32>(c - '0');
else if (c >= 'A' && c <= 'F')
flags = (flags << 4) | static_cast<UInt32>(c - 'A' + 10);
else if (c >= 'a' && c <= 'f')
flags = (flags << 4) | static_cast<UInt32>(c - 'a' + 10);
else break;
}
fmt.mFormatFlags = flags;
}
if (*p == '#') {
++p;
while (isdigit(*p))
fmt.mFramesPerPacket = 10 * fmt.mFramesPerPacket + static_cast<UInt32>(*p++ - '0');
}
if (*p == ':') {
++p;
fmt.mFormatFlags &= ~static_cast<UInt32>(kLinearPCMFormatFlagIsPacked);
if (*p == 'L')
fmt.mFormatFlags &= ~static_cast<UInt32>(kLinearPCMFormatFlagIsAlignedHigh);
else if (*p == 'H')
fmt.mFormatFlags |= kLinearPCMFormatFlagIsAlignedHigh;
else
goto Bail;
++p;
UInt32 bytesPerFrame = 0;
while (isdigit(*p))
bytesPerFrame = 10 * bytesPerFrame + static_cast<UInt32>(*p++ - '0');
fmt.mBytesPerFrame = fmt.mBytesPerPacket = bytesPerFrame;
}
if (*p == ',') {
++p;
int ch = 0;
while (isdigit(*p))
ch = 10 * ch + (*p++ - '0');
fmt.mChannelsPerFrame = static_cast<UInt32>(ch);
if (*p == 'D') {
++p;
if (fmt.mFormatID != kAudioFormatLinearPCM) {
fprintf(stderr, "non-interleaved flag invalid for non-PCM formats\n");
goto Bail;
}
fmt.mFormatFlags |= kAudioFormatFlagIsNonInterleaved;
} else {
if (*p == 'I') ++p; // default
if (fmt.mFormatID == kAudioFormatLinearPCM)
fmt.mBytesPerPacket = fmt.mBytesPerFrame *= static_cast<UInt32>(ch);
}
}
if (*p != '\0') {
fprintf(stderr, "extra characters at end of format string: %s\n", p);
goto Bail;
}
return true;
Bail:
fprintf(stderr, "Invalid format string: %s\n", inTextDesc);
fprintf(stderr, "Syntax of format strings is: \n");
return false;
}
const char *CAStreamBasicDescription::sTextParsingUsageString =
"format[@sample_rate_hz][/format_flags][#frames_per_packet][:LHbytesPerFrame][,channelsDI].\n"
"Format for PCM is [-][BE|LE]{F|I|UI}{bitdepth}; else a 4-char format code (e.g. aac, alac).\n";
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