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Get all of the basic AIFF properties working.

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git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@808275 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
This commit is contained in:
Scott Wheeler 2008-05-16 08:50:17 +00:00
parent c52f3a4974
commit 08b6514420
2 changed files with 57 additions and 5 deletions
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9
taglib/riff/aiff/aifffile.cpp
View File

@ -39,6 +39,7 @@ class RIFF::AIFF::File::FilePrivate
{
public:
FilePrivate() :
properties(0),
tag(0)
{
@ -46,9 +47,11 @@ public:
~FilePrivate()
{
delete properties;
delete tag;
}
Properties *properties;
ID3v2::Tag *tag;
};
@ -76,7 +79,7 @@ ID3v2::Tag *RIFF::AIFF::File::tag() const
RIFF::AIFF::Properties *RIFF::AIFF::File::audioProperties() const
{
return 0;
return d->properties;
}
bool RIFF::AIFF::File::save()
@ -95,11 +98,13 @@ bool RIFF::AIFF::File::save()
// private members
////////////////////////////////////////////////////////////////////////////////
void RIFF::AIFF::File::read(bool readProperties, Properties::ReadStyle /* propertiesStyle */)
void RIFF::AIFF::File::read(bool readProperties, Properties::ReadStyle propertiesStyle)
{
for(uint i = 0; i < chunkCount(); i++) {
if(chunkName(i) == "ID3 ")
d->tag = new ID3v2::Tag(this, chunkOffset(i));
else if(chunkName(i) == "COMM" && readProperties)
d->properties = new Properties(chunkData(i), propertiesStyle);
}
if(!d->tag)

53
taglib/riff/aiff/aiffproperties.cpp
View File

@ -25,10 +25,52 @@
#include <tstring.h>
#include <tdebug.h>
#include <bitset>
#include <cmath>
#include "aiffproperties.h"
////////////////////////////////////////////////////////////////////////////////
// nasty 80-bit float helpers
////////////////////////////////////////////////////////////////////////////////
#define UnsignedToFloat(u) (((double)((long)(u - 2147483647L - 1))) + 2147483648.0)
static double ConvertFromIeeeExtended(unsigned char *bytes)
{
double f;
int expon;
unsigned long hiMant, loMant;
expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
hiMant = ((unsigned long)(bytes[2] & 0xFF) << 24) |
((unsigned long)(bytes[3] & 0xFF) << 16) |
((unsigned long)(bytes[4] & 0xFF) << 8) |
((unsigned long)(bytes[5] & 0xFF));
loMant = ((unsigned long)(bytes[6] & 0xFF) << 24) |
((unsigned long)(bytes[7] & 0xFF) << 16) |
((unsigned long)(bytes[8] & 0xFF) << 8) |
((unsigned long)(bytes[9] & 0xFF));
if (expon == 0 && hiMant == 0 && loMant == 0)
f = 0;
else {
if(expon == 0x7FFF) /* Infinity or NaN */
f = HUGE_VAL;
else {
expon -= 16383;
f = ldexp(UnsignedToFloat(hiMant), expon -= 31);
f += ldexp(UnsignedToFloat(loMant), expon -= 32);
}
}
if(bytes[0] & 0x80)
return -f;
else
return f;
}
using namespace TagLib;
class RIFF::AIFF::Properties::PropertiesPrivate
@ -84,12 +126,17 @@ int RIFF::AIFF::Properties::channels() const
return d->channels;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
void RIFF::AIFF::Properties::read(const ByteVector &data)
{
d->channels = data.mid(0, 2).toShort();
uint sampleFrames = data.mid(2, 4).toUInt();
short sampleSize = data.mid(6, 2).toShort();
double sampleRate = ConvertFromIeeeExtended(reinterpret_cast<unsigned char *>(data.mid(8, 10).data()));
d->sampleRate = sampleRate;
d->bitrate = (sampleRate * sampleSize * d->channels) / 1024.0;
d->length = sampleFrames / d->sampleRate;
}