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Added sampleFrames() to audio properties

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This commit is contained in:
Stephen F. Booth
2012-04-06 18:30:13 -04:00
parent 2297a6d531
commit 69ac59f5f0
6 changed files with 51 additions and 11 deletions
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39
taglib/mpc/mpcproperties.cpp
View File

@ -43,7 +43,9 @@ public:
length(0),
bitrate(0),
sampleRate(0),
channels(0) {}
channels(0),
totalFrames(0),
sampleFrames(0) {}
ByteVector data;
long streamLength;
@ -53,6 +55,8 @@ public:
int bitrate;
int sampleRate;
int channels;
uint totalFrames;
uint sampleFrames;
};
////////////////////////////////////////////////////////////////////////////////
@ -95,6 +99,16 @@ int MPC::Properties::mpcVersion() const
return d->version;
}
uint MPC::Properties::totalFrames() const
{
return d->totalFrames;
}
uint MPC::Properties::sampleFrames() const
{
return d->sampleFrames;
}
////////////////////////////////////////////////////////////////////////////////
// private members
////////////////////////////////////////////////////////////////////////////////
@ -108,14 +122,21 @@ void MPC::Properties::read()
d->version = d->data[3] & 15;
unsigned int frames;
if(d->version >= 7) {
frames = d->data.mid(4, 4).toUInt(false);
d->totalFrames = d->data.mid(4, 4).toUInt(false);
std::bitset<32> flags(TAGLIB_CONSTRUCT_BITSET(d->data.mid(8, 4).toUInt(false)));
d->sampleRate = sftable[flags[17] * 2 + flags[16]];
d->channels = 2;
uint gapless = d->data.mid(5, 4).toUInt(false);
bool trueGapless = (gapless >> 31) & 0x0001;
if(trueGapless) {
uint lastFrameSamples = (gapless >> 20) & 0x07FF;
d->sampleFrames = d->totalFrames * 1152 - lastFrameSamples;
}
else
d->sampleFrames = d->totalFrames * 1152 - 576;
}
else {
uint headerData = d->data.mid(0, 4).toUInt(false);
@ -126,14 +147,14 @@ void MPC::Properties::read()
d->channels = 2;
if(d->version >= 5)
frames = d->data.mid(4, 4).toUInt(false);
d->totalFrames = d->data.mid(4, 4).toUInt(false);
else
frames = d->data.mid(6, 2).toUInt(false);
d->totalFrames = d->data.mid(6, 2).toUInt(false);
d->sampleFrames = d->totalFrames * 1152 - 576;
}
uint samples = frames * 1152 - 576;
d->length = d->sampleRate > 0 ? (samples + (d->sampleRate / 2)) / d->sampleRate : 0;
d->length = d->sampleRate > 0 ? (d->sampleFrames + (d->sampleRate / 2)) / d->sampleRate : 0;
if(!d->bitrate)
d->bitrate = d->length > 0 ? ((d->streamLength * 8L) / d->length) / 1000 : 0;

2
taglib/mpc/mpcproperties.h
View File

@ -69,6 +69,8 @@ namespace TagLib {
* Returns the version of the bitstream (SV4-SV7)
*/
int mpcVersion() const;
uint totalFrames() const;
uint sampleFrames() const;
private:
Properties(const Properties &);