Examples of org.jaudiotagger.audio.exceptions.CannotReadException

Package org.jaudiotagger.audio.exceptions

Examples of org.jaudiotagger.audio.exceptions.CannotReadException

org.jaudiotagger.audio.exceptions.CannotReadException
This exception is thrown if an audio file cannot be read.
Causes may be invalid data or IO errors. @author Raphael Slinckx

        checkFileExists(f);
        String ext = Utils.getExtension(f);


        AudioFileReader afr = readers.get(ext);
        if (afr == null) {
            throw new CannotReadException(ErrorMessage.NO_READER_FOR_THIS_FORMAT.getMsg(ext));
        }


        return afr.read(f);
    }

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            return dataTree;
        } finally {
            //If we cant find the audio then we cannot modify this file so better to throw exception
            //now rather than later when try and write to it.
            if (mdatNode == null) {
                throw new CannotReadException(ErrorMessage.MP4_CANNOT_FIND_AUDIO.getMsg());
            }


            if (closeExit) {
                fc.close();
            }

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        //Now at start of packets on page 2 , check this is the vorbis comment header 
        byte[] b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
        raf.read(b);
        if (!isVorbisCommentHeader(b)) {
            throw new CannotReadException("Cannot find comment block (no vorbiscomment header)");
        }


        //Convert the comment raw data which maybe over many pages back into raw packet
        byte[] rawVorbisCommentData = convertToVorbisCommentPacket(pageHeader, raf);
        return rawVorbisCommentData;

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        //Now should be at start of next packet, check this is the vorbis setup header
        byte[] b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
        raf.read(b);
        if (!isVorbisSetupHeader(b)) {
            throw new CannotReadException("Unable to find setup header(2), unable to write ogg file");
        }


        //Go back to start of setupheader data
        raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));

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        //Now should be at start of next packet, check this is the vorbis setup header
        byte[] b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
        raf.read(b);
        if (!isVorbisSetupHeader(b)) {
            throw new CannotReadException("Unable to find setup header(2), unable to write ogg file");
        }


        //Go back to start of setupheader data
        raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));

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        //Now at start of packets on page 2 , check this is the vorbis comment header
        byte[] b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
        raf.read(b);
        if (!isVorbisCommentHeader(b)) {
            throw new CannotReadException("Cannot find comment block (no vorbiscomment header)");
        }
        raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));
//        //logger.fine("Found start of comment header at:" + raf.getFilePointer());


        //Calculate Comment Size (not inc header)
        while (true) {
            List<OggPageHeader.PacketStartAndLength> packetList = pageHeader.getPacketList();
            commentHeaderSize += packetList.get(0).getLength();
            raf.skipBytes(packetList.get(0).getLength());


            //If this page contains multiple packets or if this last packet is complete then the Comment header
            //end son this page and we can break
            if (packetList.size() > 1 || !pageHeader.isLastPacketIncomplete()) {
                //done comment size
//                //logger.fine("Found end of comment:size:" + commentHeaderSize + "finishes at file position:" + raf.getFilePointer());
                break;
            }
            pageHeader = OggPageHeader.read(raf);
        }


        //If there are no more packets on this page we need to go to next page to get the setup header
        OggPageHeader.PacketStartAndLength packet;
        if (pageHeader.getPacketList().size() == 1) {
            pageHeader = OggPageHeader.read(raf);
            List<OggPageHeader.PacketStartAndLength> packetList = pageHeader.getPacketList();
            packet = pageHeader.getPacketList().get(0);


            //Now at start of next packet , check this is the vorbis setup header
            b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
            raf.read(b);
            if (!isVorbisSetupHeader(b)) {
                throw new CannotReadException(ErrorMessage.OGG_VORBIS_NO_VORBIS_HEADER_FOUND.getMsg());
            }
            raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));
//        //logger.fine("Found start of vorbis setup header at file position:" + raf.getFilePointer());


            //Set this to the  start of the OggPage that setupheader was found on
            setupHeaderStartPosition = raf.getFilePointer() - (OggPageHeader.OGG_PAGE_HEADER_FIXED_LENGTH + pageHeader.getSegmentTable().length);


            //Add packet data to size to the setup header size
            setupHeaderSize = packet.getLength();
//        //logger.fine("Adding:" + packetList.get(1).getLength() + " to setup header size");


            //Skip over the packet data
            raf.skipBytes(packet.getLength());


            //If there are other packets that follow this one, or if the last packet is complete then we must have
            //got the size of the setup header.
            if (packetList.size() > 1 || !pageHeader.isLastPacketIncomplete()) {
//                logger.info("Found end of setupheader:size:" + setupHeaderSize + "finishes at:" + raf.getFilePointer());
                if (packetList.size() > 1) {
                    extraPackets = packetList.subList(1, packetList.size());
                }
            }
            //The setup header continues onto the next page
            else {
                pageHeader = OggPageHeader.read(raf);
                packetList = pageHeader.getPacketList();
                while (true) {
                    setupHeaderSize += packetList.get(0).getLength();
//                    logger.fine("Adding:" + packetList.get(0).getLength() + " to setup header size");
                    raf.skipBytes(packetList.get(0).getLength());
                    if (packetList.size() > 1 || !pageHeader.isLastPacketIncomplete()) {
                        //done setup size
//                        logger.fine("Found end of setupheader:size:" + setupHeaderSize + "finishes at:" + raf.getFilePointer());
                        if (packetList.size() > 1) {
                            extraPackets = packetList.subList(1, packetList.size());
                        }
                        break;
                    }
                    //Continues onto another page
                    pageHeader = OggPageHeader.read(raf);
                }
            }
        }
        //else its next packet on this page
        else {
            packet = pageHeader.getPacketList().get(1);
            List<OggPageHeader.PacketStartAndLength> packetList = pageHeader.getPacketList();


            //Now at start of next packet , check this is the vorbis setup header
            b = new byte[VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH];
            raf.read(b);
            if (!isVorbisSetupHeader(b)) {
                //logger.warning("Expecting but got:" + new String(b) + "at " + (raf.getFilePointer() - b.length));
                throw new CannotReadException(ErrorMessage.OGG_VORBIS_NO_VORBIS_HEADER_FOUND.getMsg());
            }
            raf.seek(raf.getFilePointer() - (VorbisHeader.FIELD_PACKET_TYPE_LENGTH + VorbisHeader.FIELD_CAPTURE_PATTERN_LENGTH));
//            logger.info("Found start of vorbis setup header at file position:" + raf.getFilePointer());


            //Set this to the  start of the OggPage that setupheader was found on

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    public void processData() throws CannotReadException {
        //4-skip the meta flags and check they are the meta flags
        byte[] b = new byte[FLAGS_LENGTH];
        dataBuffer.get(b);
        if (b[0] != 0) {
            throw new CannotReadException(ErrorMessage.MP4_FILE_META_ATOM_CHILD_DATA_NOT_NULL.getMsg());
        }
    }

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    }


    public static void debugShowStcoInfo(RandomAccessFile raf) throws IOException, CannotReadException {
        Mp4BoxHeader moovHeader = Mp4BoxHeader.seekWithinLevel(raf, Mp4NotMetaFieldKey.MOOV.getFieldName());
        if (moovHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }
        ByteBuffer moovBuffer = ByteBuffer.allocate(moovHeader.getLength() - Mp4BoxHeader.HEADER_LENGTH);
        raf.getChannel().read(moovBuffer);
        moovBuffer.rewind();


        //Level 2-Searching for "mvhd" somewhere within "moov", we make a slice after finding header
        //so all getFields() methods will be relative to mvdh positions
        Mp4BoxHeader boxHeader = Mp4BoxHeader.seekWithinLevel(moovBuffer, Mp4NotMetaFieldKey.MVHD.getFieldName());
        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }
        ByteBuffer mvhdBuffer = moovBuffer.slice();
        Mp4MvhdBox mvhd = new Mp4MvhdBox(boxHeader, mvhdBuffer);
        mvhdBuffer.position(mvhdBuffer.position() + boxHeader.getDataLength());


        //Level 2-Searching for "trak" within "moov"
        boxHeader = Mp4BoxHeader.seekWithinLevel(mvhdBuffer, Mp4NotMetaFieldKey.TRAK.getFieldName());
        int endOfFirstTrackInBuffer = mvhdBuffer.position() + boxHeader.getDataLength();


        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }
        //Level 3-Searching for "mdia" within "trak"
        boxHeader = Mp4BoxHeader.seekWithinLevel(mvhdBuffer, Mp4NotMetaFieldKey.MDIA.getFieldName());
        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }


        //Level 4-Searching for "mdhd" within "mdia"
        boxHeader = Mp4BoxHeader.seekWithinLevel(mvhdBuffer, Mp4NotMetaFieldKey.MDHD.getFieldName());
        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }


        //Level 4-Searching for "minf" within "mdia"
        mvhdBuffer.position(mvhdBuffer.position() + boxHeader.getDataLength());
        boxHeader = Mp4BoxHeader.seekWithinLevel(mvhdBuffer, Mp4NotMetaFieldKey.MINF.getFieldName());
        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }


        //Level 5-Searching for "smhd" within "minf"
        //Only an audio track would have a smhd frame
        boxHeader = Mp4BoxHeader.seekWithinLevel(mvhdBuffer, Mp4NotMetaFieldKey.SMHD.getFieldName());
        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }
        mvhdBuffer.position(mvhdBuffer.position() + boxHeader.getDataLength());


        //Level 5-Searching for "stbl within "minf"
        boxHeader = Mp4BoxHeader.seekWithinLevel(mvhdBuffer, Mp4NotMetaFieldKey.STBL.getFieldName());
        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }


        //Level 6-Searching for "stco within "stbl"
        boxHeader = Mp4BoxHeader.seekWithinLevel(mvhdBuffer, Mp4NotMetaFieldKey.STCO.getFieldName());
        if (boxHeader == null) {
            throw new CannotReadException("This file does not appear to be an audio file");
        }
        Mp4StcoBox stco = new Mp4StcoBox(boxHeader, mvhdBuffer);
        stco.printAlloffsets();
    }

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Related Classes of org.jaudiotagger.audio.exceptions.CannotReadException

org.jaudiotagger.audio.AudioFileIO

org.jaudiotagger.audio.flac.FlacInfoReader

org.jaudiotagger.audio.flac.FlacStreamReader

org.jaudiotagger.audio.generic.AudioFileReader

org.jaudiotagger.audio.mp4.atom.Mp4MetaBox

org.jaudiotagger.audio.mp4.atom.Mp4StcoBox

org.jaudiotagger.audio.mp4.Mp4AtomTree

org.jaudiotagger.audio.mp4.Mp4InfoReader

org.jaudiotagger.audio.mp4.Mp4TagReader

org.jaudiotagger.audio.ogg.OggVorbisTagReader

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