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/**************************************************************************
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/ *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <tdebug.h>
#include <tstring.h>
#include "mp4atom.h"
using namespace TagLib;
const char *MP4::Atom::containers[11] = {
"moov", "udta", "mdia", "meta", "ilst",
"stbl", "minf", "moof", "traf", "trak",
"stsd"
};
MP4::Atom::Atom(File *file)
{
offset = file->tell();
ByteVector header = file->readBlock(8);
if (header.size() != 8) {
// The atom header must be 8 bytes long, otherwise there is either
// trailing garbage or the file is truncated
debug("MP4: Couldn't read 8 bytes of data for atom header");
length = 0;
file->seek(0, File::End);
return;
}
length = header.mid(0, 4).toUInt();
if (length == 1) {
long long longLength = file->readBlock(8).toLongLong();
if (longLength >= 8 && longLength <= 0xFFFFFFFF) {
// The atom has a 64-bit length, but it's actually a 32-bit value
length = (long)longLength;
}
else {
debug("MP4: 64-bit atoms are not supported");
length = 0;
file->seek(0, File::End);
return;
}
}
if (length < 8) {
debug("MP4: Invalid atom size");
length = 0;
file->seek(0, File::End);
return;
}
name = header.mid(4, 4);
for(int i = 0; i < numContainers; i++) {
if(name == containers[i]) {
if(name == "meta") {
file->seek(4, File::Current);
}
else if(name == "stsd") {
file->seek(8, File::Current);
}
while(file->tell() < offset + length) {
MP4::Atom *child = new MP4::Atom(file);
children.append(child);
if (child->length == 0)
return;
}
return;
}
}
file->seek(offset + length);
}
MP4::Atom::~Atom()
{
for(unsigned int i = 0; i < children.size(); i++) {
delete children[i];
}
children.clear();
}
MP4::Atom *
MP4::Atom::find(const char *name1, const char *name2, const char *name3, const char *name4)
{
if(name1 == 0) {
return this;
}
for(unsigned int i = 0; i < children.size(); i++) {
if(children[i]->name == name1) {
return children[i]->find(name2, name3, name4);
}
}
return 0;
}
MP4::AtomList
MP4::Atom::findall(const char *name, bool recursive)
{
MP4::AtomList result;
for(unsigned int i = 0; i < children.size(); i++) {
if(children[i]->name == name) {
result.append(children[i]);
}
if(recursive) {
result.append(children[i]->findall(name, recursive));
}
}
return result;
}
bool
MP4::Atom::path(MP4::AtomList &path, const char *name1, const char *name2, const char *name3)
{
path.append(this);
if(name1 == 0) {
return true;
}
for(unsigned int i = 0; i < children.size(); i++) {
if(children[i]->name == name1) {
return children[i]->path(path, name2, name3);
}
}
return false;
}
MP4::Atoms::Atoms(File *file)
{
file->seek(0, File::End);
long end = file->tell();
file->seek(0);
while(file->tell() + 8 <= end) {
MP4::Atom *atom = new MP4::Atom(file);
atoms.append(atom);
if (atom->length == 0)
break;
}
}
MP4::Atoms::~Atoms()
{
for(unsigned int i = 0; i < atoms.size(); i++) {
delete atoms[i];
}
atoms.clear();
}
MP4::Atom *
MP4::Atoms::find(const char *name1, const char *name2, const char *name3, const char *name4)
{
for(unsigned int i = 0; i < atoms.size(); i++) {
if(atoms[i]->name == name1) {
return atoms[i]->find(name2, name3, name4);
}
}
return 0;
}
MP4::AtomList
MP4::Atoms::path(const char *name1, const char *name2, const char *name3, const char *name4)
{
MP4::AtomList path;
for(unsigned int i = 0; i < atoms.size(); i++) {
if(atoms[i]->name == name1) {
if(!atoms[i]->path(path, name2, name3, name4)) {
path.clear();
}
return path;
}
}
return path;
}
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