192 lines
5.1 KiB
C++
192 lines
5.1 KiB
C++
/**************************************************************************
|
|
copyright : (C) 2007 by Lukáš Lalinský
|
|
email : lalinsky@gmail.com
|
|
**************************************************************************/
|
|
|
|
/***************************************************************************
|
|
* This library is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU Lesser General Public License version *
|
|
* 2.1 as published by the Free Software Foundation. *
|
|
* *
|
|
* This library is distributed in the hope that it will be useful, but *
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of *
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
|
|
* Lesser General Public License for more details. *
|
|
* *
|
|
* You should have received a copy of the GNU Lesser General Public *
|
|
* License along with this library; if not, write to the Free Software *
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
|
|
* 02110-1301 USA *
|
|
* *
|
|
* Alternatively, this file is available under the Mozilla Public *
|
|
* License Version 1.1. You may obtain a copy of the License at *
|
|
* http://www.mozilla.org/MPL/ *
|
|
***************************************************************************/
|
|
|
|
#include <tdebug.h>
|
|
#include <tstring.h>
|
|
#include "mp4file.h"
|
|
#include "mp4atom.h"
|
|
#include "mp4properties.h"
|
|
|
|
using namespace TagLib;
|
|
|
|
class MP4::Properties::PropertiesPrivate
|
|
{
|
|
public:
|
|
PropertiesPrivate() : length(0), bitrate(0), sampleRate(0), channels(0), bitsPerSample(0), encrypted(false) {}
|
|
|
|
int length;
|
|
int bitrate;
|
|
int sampleRate;
|
|
int channels;
|
|
int bitsPerSample;
|
|
bool encrypted;
|
|
};
|
|
|
|
MP4::Properties::Properties(File *file, MP4::Atoms *atoms, ReadStyle style)
|
|
: AudioProperties(style)
|
|
{
|
|
d = new PropertiesPrivate;
|
|
|
|
MP4::Atom *moov = atoms->find("moov");
|
|
if(!moov) {
|
|
debug("MP4: Atom 'moov' not found");
|
|
return;
|
|
}
|
|
|
|
MP4::Atom *trak = 0;
|
|
ByteVector data;
|
|
|
|
MP4::AtomList trakList = moov->findall("trak");
|
|
for (unsigned int i = 0; i < trakList.size(); i++) {
|
|
trak = trakList[i];
|
|
MP4::Atom *hdlr = trak->find("mdia", "hdlr");
|
|
if(!hdlr) {
|
|
debug("MP4: Atom 'trak.mdia.hdlr' not found");
|
|
return;
|
|
}
|
|
file->seek(hdlr->offset);
|
|
data = file->readBlock(hdlr->length);
|
|
if(data.mid(16, 4) == "soun") {
|
|
break;
|
|
}
|
|
trak = 0;
|
|
}
|
|
if (!trak) {
|
|
debug("MP4: No audio tracks");
|
|
return;
|
|
}
|
|
|
|
MP4::Atom *mdhd = trak->find("mdia", "mdhd");
|
|
if(!mdhd) {
|
|
debug("MP4: Atom 'trak.mdia.mdhd' not found");
|
|
return;
|
|
}
|
|
|
|
file->seek(mdhd->offset);
|
|
data = file->readBlock(mdhd->length);
|
|
uint version = data[8];
|
|
if(version == 1) {
|
|
if (data.size() < 36 + 8) {
|
|
debug("MP4: Atom 'trak.mdia.mdhd' is smaller than expected");
|
|
return;
|
|
}
|
|
const long long unit = data.toLongLong(28U);
|
|
const long long length = data.toLongLong(36U);
|
|
d->length = unit ? int(length / unit) : 0;
|
|
}
|
|
else {
|
|
if (data.size() < 24 + 4) {
|
|
debug("MP4: Atom 'trak.mdia.mdhd' is smaller than expected");
|
|
return;
|
|
}
|
|
const unsigned int unit = data.toUInt(20U);
|
|
const unsigned int length = data.toUInt(24U);
|
|
d->length = unit ? length / unit : 0;
|
|
}
|
|
|
|
MP4::Atom *atom = trak->find("mdia", "minf", "stbl", "stsd");
|
|
if(!atom) {
|
|
return;
|
|
}
|
|
|
|
file->seek(atom->offset);
|
|
data = file->readBlock(atom->length);
|
|
if(data.mid(20, 4) == "mp4a") {
|
|
d->channels = data.toShort(40U);
|
|
d->bitsPerSample = data.toShort(42U);
|
|
d->sampleRate = data.toUInt(46U);
|
|
if(data.mid(56, 4) == "esds" && data[64] == 0x03) {
|
|
uint pos = 65;
|
|
if(data.mid(pos, 3) == "\x80\x80\x80") {
|
|
pos += 3;
|
|
}
|
|
pos += 4;
|
|
if(data[pos] == 0x04) {
|
|
pos += 1;
|
|
if(data.mid(pos, 3) == "\x80\x80\x80") {
|
|
pos += 3;
|
|
}
|
|
pos += 10;
|
|
d->bitrate = (data.toUInt(pos) + 500) / 1000;
|
|
}
|
|
}
|
|
}
|
|
else if (data.mid(20, 4) == "alac") {
|
|
if (atom->length == 88 && data.mid(56, 4) == "alac") {
|
|
d->bitsPerSample = data.at(69);
|
|
d->channels = data.at(73);
|
|
d->bitrate = data.toUInt(80U) / 1000;
|
|
d->sampleRate = data.toUInt(84U);
|
|
}
|
|
}
|
|
|
|
MP4::Atom *drms = atom->find("drms");
|
|
if(drms) {
|
|
d->encrypted = true;
|
|
}
|
|
}
|
|
|
|
MP4::Properties::~Properties()
|
|
{
|
|
delete d;
|
|
}
|
|
|
|
int
|
|
MP4::Properties::channels() const
|
|
{
|
|
return d->channels;
|
|
}
|
|
|
|
int
|
|
MP4::Properties::sampleRate() const
|
|
{
|
|
return d->sampleRate;
|
|
}
|
|
|
|
int
|
|
MP4::Properties::length() const
|
|
{
|
|
return d->length;
|
|
}
|
|
|
|
int
|
|
MP4::Properties::bitrate() const
|
|
{
|
|
return d->bitrate;
|
|
}
|
|
|
|
int
|
|
MP4::Properties::bitsPerSample() const
|
|
{
|
|
return d->bitsPerSample;
|
|
}
|
|
|
|
bool
|
|
MP4::Properties::isEncrypted() const
|
|
{
|
|
return d->encrypted;
|
|
}
|
|
|