/***************************************************************************    copyright            : (C) 2002, 2003, 2006 by Jochen Issing    email                : jochen.issing@isign-softart.de ***************************************************************************//*************************************************************************** *   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                                                   * ***************************************************************************/#include <iostream>#include "mp4audiosampleentry.h"#include "mp4isobox.h"#include "mp4file.h"#include "mp4propsproxy.h"using namespace TagLib;class MP4::Mp4AudioSampleEntry::Mp4AudioSampleEntryPrivate{public:  TagLib::uint channelcount;  TagLib::uint samplerate;  TagLib::uint bitrate;};MP4::Mp4AudioSampleEntry::Mp4AudioSampleEntry( TagLib::File* file, MP4::Fourcc fourcc, uint size, long offset )	:Mp4SampleEntry(file, fourcc, size, offset){  d = new MP4::Mp4AudioSampleEntry::Mp4AudioSampleEntryPrivate();}MP4::Mp4AudioSampleEntry::~Mp4AudioSampleEntry(){  delete d;}TagLib::uint MP4::Mp4AudioSampleEntry::channels() const{  return d->channelcount;}TagLib::uint MP4::Mp4AudioSampleEntry::samplerate() const{  return d->samplerate;}TagLib::uint MP4::Mp4AudioSampleEntry::bitrate() const{  return d->bitrate;}void MP4::Mp4AudioSampleEntry::parseEntry(){  TagLib::MP4::File* mp4file = dynamic_cast<TagLib::MP4::File*>(file());  if(!mp4file)    return;  // read 8 reserved bytes  mp4file->seek( 8, TagLib::File::Current );  // read channelcount  if(!mp4file->readShort( d->channelcount ))    return;  // seek over samplesize, pre_defined and reserved  mp4file->seek( 6, TagLib::File::Current );  // read samplerate  if(!mp4file->readInt( d->samplerate ))    return;  // register box at proxy  mp4file->propProxy()->registerAudioSampleEntry( this );  //std::cout << "fourcc of audio sample entry: " << fourcc().toString() << std::endl;  // check for both mp4a (plain files) and drms (encrypted files)  if( (fourcc() == MP4::Fourcc("mp4a")) ||      (fourcc() == MP4::Fourcc("drms"))  )  {    TagLib::MP4::Fourcc fourcc;    TagLib::uint        esds_size;    if (!mp4file->readSizeAndType( esds_size, fourcc ))	return;    // read esds' main parts    if( size()-48 > 0 )      ByteVector flags_version = mp4file->readBlock(4);    else      return;    ByteVector EsDescrTag = mp4file->readBlock(1);    // first 4 bytes contain full box specifics (version & flags)    // upcoming byte must be ESDescrTag (0x03)    if( EsDescrTag[0] == 0x03 )    {      TagLib::uint descr_len = mp4file->readSystemsLen();      TagLib::uint EsId;      if( !mp4file->readShort( EsId ) )	return;      ByteVector priority = mp4file->readBlock(1);      if( descr_len < 20 )	return;    }    else    {      TagLib::uint EsId;      if( !mp4file->readShort( EsId ) )	return;    }    // read decoder configuration tag (0x04)    ByteVector DecCfgTag = mp4file->readBlock(1);    if( DecCfgTag[0] != 0x04 )      return;    // read decoder configuration length    // TagLib::uint deccfg_len = mp4file->readSystemsLen();    // read object type Id    ByteVector objId = mp4file->readBlock(1);    // read stream type id    ByteVector strId = mp4file->readBlock(1);    // read buffer Size DB    ByteVector bufferSizeDB = mp4file->readBlock(3);    // read max bitrate    TagLib::uint max_bitrate;    if( !mp4file->readInt( max_bitrate ) )      return;    // read average bitrate    if( !mp4file->readInt( d->bitrate ) )      return;    // skip the rest    mp4file->seek( offset()+size()-8, File::Beginning );  }  else    mp4file->seek( size()-36, File::Current );}