diff options
Diffstat (limited to 'src/metadata/m4a/mp4audiosampleentry.cpp')
| -rw-r--r-- | src/metadata/m4a/mp4audiosampleentry.cpp | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/src/metadata/m4a/mp4audiosampleentry.cpp b/src/metadata/m4a/mp4audiosampleentry.cpp new file mode 100644 index 0000000..fb87547 --- /dev/null +++ b/src/metadata/m4a/mp4audiosampleentry.cpp @@ -0,0 +1,146 @@ +/*************************************************************************** + 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 ); +} + |