Examples of org.jaudiotagger.audio.ogg.util.OggPageHeader

org.jaudiotagger.audio.ogg.util.OggPageHeader
org/ogg/doc/framing.html @author Raphael Slinckx (KiKiDonK) @version 16 d�cembre 2003

    public void write(Tag tag, RandomAccessFile raf, RandomAccessFile rafTemp) throws CannotReadException, CannotWriteException, IOException {
        //logger.info("Starting to write file:");


        //1st Page:Identification Header
        //logger.fine("Read 1st Page:identificationHeader:");
        OggPageHeader pageHeader = OggPageHeader.read(raf);
        raf.seek(0);


        //Write 1st page (unchanged) and place writer pointer at end of data
        rafTemp.getChannel().transferFrom(raf.getChannel(), 0, pageHeader.getPageLength() + OggPageHeader.OGG_PAGE_HEADER_FIXED_LENGTH + pageHeader.getSegmentTable().length);
        rafTemp.skipBytes(pageHeader.getPageLength() + OggPageHeader.OGG_PAGE_HEADER_FIXED_LENGTH + pageHeader.getSegmentTable().length);
        //logger.fine("Written identificationHeader:");


        //2nd page:Comment and Setup if there is enough room, may also (although not normally) contain audio frames
        OggPageHeader secondPageHeader = OggPageHeader.read(raf);


        //2nd Page:Store the end of Header
        long secondPageHeaderEndPos = raf.getFilePointer();
        //logger.fine("Read 2nd Page:comment and setup and possibly audio:Header finishes at file position:" + secondPageHeaderEndPos);


        //Get header sizes
        raf.seek(0);
        OggVorbisTagReader.OggVorbisHeaderSizes vorbisHeaderSizes = reader.readOggVorbisHeaderSizes(raf);


        //Convert the OggVorbisComment header to raw packet data
        ByteBuffer newComment = tc.convert(tag);


        //Compute new comment length(this may need to be spread over multiple pages)
        int newCommentLength = newComment.capacity();


        //Calculate new size of new 2nd page
        int newSecondPageDataLength = vorbisHeaderSizes.getSetupHeaderSize() + newCommentLength + vorbisHeaderSizes.getExtraPacketDataSize();
        //logger.fine("Old 2nd Page no of packets: " + secondPageHeader.getPacketList().size());
        //logger.fine("Old 2nd Page size: " + secondPageHeader.getPageLength());
//        logger.fine("Old last packet incomplete: " + secondPageHeader.isLastPacketIncomplete());
        //logger.fine("Setup Header Size: " + vorbisHeaderSizes.getSetupHeaderSize());
//        logger.fine("Extra Packets: " + vorbisHeaderSizes.getExtraPacketList().size());
        //logger.fine("Extra Packet Size: " + vorbisHeaderSizes.getExtraPacketDataSize());
        //logger.fine("Old comment: " + vorbisHeaderSizes.getCommentHeaderSize());
        //logger.fine("New comment: " + newCommentLength);
        //logger.fine("New Page Data Size: " + newSecondPageDataLength);


        //Second Page containing new vorbis, setup and possibly some extra packets can fit on one page
        if (isCommentAndSetupHeaderFitsOnASinglePage(newCommentLength, vorbisHeaderSizes.getSetupHeaderSize(), vorbisHeaderSizes.getExtraPacketList())) {
            //And if comment and setup header originally fitted on both, the length of the 2nd
            //page must be less than maximum size allowed
            //AND
            //there must be two packets with last being complete because they may have
            //elected to split the setup over multiple pages instead of using up whole page - (as long
            //as the last lacing value is 255 they can do this)
            //   OR
            //There are more than the packets in which case have complete setup header and some audio packets
            //we dont care if the last audio packet is split on next page as long as we preserve it
            if ((secondPageHeader.getPageLength() < OggPageHeader.MAXIMUM_PAGE_DATA_SIZE) && (((secondPageHeader.getPacketList().size() == 2) && (!secondPageHeader.isLastPacketIncomplete())) || (secondPageHeader.getPacketList().size() > 2))) {
                //logger.info("Header and Setup remain on single page:");
                replaceSecondPageOnly(vorbisHeaderSizes, newCommentLength, newSecondPageDataLength, secondPageHeader, newComment, secondPageHeaderEndPos, raf, rafTemp);
            }
            //Original 2nd page spanned multiple pages so more work to do
            else {

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        //Read in the rest of the data into bytebuffer and rewind it to start
        raf.getChannel().read(bb);
        bb.rewind();
        while (bb.hasRemaining()) {
            OggPageHeader nextPage = OggPageHeader.read(bb);


            //Create buffer large enough for next page (header and data) and set byte order to LE so we can use
            //putInt method
            ByteBuffer nextPageHeaderBuffer = ByteBuffer.allocate(nextPage.getRawHeaderData().length + nextPage.getPageLength());
            nextPageHeaderBuffer.order(ByteOrder.LITTLE_ENDIAN);
            nextPageHeaderBuffer.put(nextPage.getRawHeaderData());
            ByteBuffer data = bb.slice();
            data.limit(nextPage.getPageLength());
            nextPageHeaderBuffer.put(data);
            nextPageHeaderBuffer.putInt(OggPageHeader.FIELD_PAGE_SEQUENCE_NO_POS, ++pageSequence);
            calculateChecksumOverPage(nextPageHeaderBuffer);
            bb.position(bb.position() + nextPage.getPageLength());


            nextPageHeaderBuffer.rewind();
            bbTemp.put(nextPageHeaderBuffer);
        }
        //Now just write as a single IO operation

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        long startAudio = raf.getFilePointer();
        long startAudioWritten = rafTemp.getFilePointer();
//        logger.fine("Writing audio, audio starts in original file at :" + startAudio + ":Written to:" + startAudioWritten);
        while (raf.getFilePointer() < raf.length()) {
//            logger.fine("Reading Ogg Page");
            OggPageHeader nextPage = OggPageHeader.read(raf);


            //Create buffer large enough for next page (header and data) and set byte order to LE so we can use
            //putInt method
            ByteBuffer nextPageHeaderBuffer = ByteBuffer.allocate(nextPage.getRawHeaderData().length + nextPage.getPageLength());
            nextPageHeaderBuffer.order(ByteOrder.LITTLE_ENDIAN);


            nextPageHeaderBuffer.put(nextPage.getRawHeaderData());
            raf.getChannel().read(nextPageHeaderBuffer);


            //Recalculate Page Sequence Number
            nextPageHeaderBuffer.putInt(OggPageHeader.FIELD_PAGE_SEQUENCE_NO_POS, ++pageSequence);

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     * @return
     * @throws CannotReadException
     * @throws IOException
     */
    public OggPageHeader readOggPageHeader(RandomAccessFile raf, int count) throws CannotReadException, IOException {
        OggPageHeader pageHeader = OggPageHeader.read(raf);
        while (count > 0) {
            raf.seek(raf.getFilePointer() + pageHeader.getPageLength());
            pageHeader = OggPageHeader.read(raf);
            count--;
        }
        return pageHeader;
    }

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    public void summarizeOggPageHeaders(File oggFile) throws CannotReadException, IOException {
        RandomAccessFile raf = new RandomAccessFile(oggFile, "r");


        while (raf.getFilePointer() < raf.length()) {
            System.out.println("pageHeader starts at absolute file position:" + raf.getFilePointer());
            OggPageHeader pageHeader = OggPageHeader.read(raf);
            System.out.println("pageHeader finishes at absolute file position:" + raf.getFilePointer());
            System.out.println(pageHeader + "\n");
            raf.seek(raf.getFilePointer() + pageHeader.getPageLength());
        }
        System.out.println("Raf File Pointer at:" + raf.getFilePointer() + "File Size is:" + raf.length());
        raf.close();
    }

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        RandomAccessFile raf = new RandomAccessFile(oggFile, "r");


        int i = 0;
        while (raf.getFilePointer() < raf.length()) {
            System.out.println("pageHeader starts at absolute file position:" + raf.getFilePointer());
            OggPageHeader pageHeader = OggPageHeader.read(raf);
            System.out.println("pageHeader finishes at absolute file position:" + raf.getFilePointer());
            System.out.println(pageHeader + "\n");
            raf.seek(raf.getFilePointer() + pageHeader.getPageLength());
            i++;
            if (i >= 5) {
                break;
            }
        }

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     * @throws IOException
     */
    public byte[] readRawPacketData(RandomAccessFile raf) throws CannotReadException, IOException {
//        //logger.fine("Read 1st page");
        //1st page = codec infos
        OggPageHeader pageHeader = OggPageHeader.read(raf);
        //Skip over data to end of page header 1
        raf.seek(raf.getFilePointer() + pageHeader.getPageLength());


//        //logger.fine("Read 2nd page");
        //2nd page = comment, may extend to additional pages or not , may also have setup header
        pageHeader = OggPageHeader.read(raf);

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        //The VorbisComment extends to the next page, so should be at end of page already
        //so carry on reading pages until we get to the end of comment
        while (true) {
//            //logger.info("Reading next page");
            OggPageHeader nextPageHeader = OggPageHeader.read(raf);
            b = new byte[nextPageHeader.getPacketList().get(0).getLength()];
            raf.read(b);
            baos.write(b);


            //Because there is at least one other packet (SetupHeaderPacket) this means the Comment Packet has finished
            //on this page so thats all we need and we can return
            if (nextPageHeader.getPacketList().size() > 1) {
//                //logger.info("Comments finish on Page because there is another packet on this page");
                return baos.toByteArray();
            }


            //There is only the VorbisComment packet on page if it has completed on this page we can return
            if (!nextPageHeader.isLastPacketIncomplete()) {
//                //logger.info("Comments finish on Page because this packet is complete");
                return baos.toByteArray();
            }
        }
    }

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        //Seek to specified offset
        raf.seek(fileOffsetOfStartingOggPage);


        //Read Page
        OggPageHeader setupPageHeader = OggPageHeader.read(raf);


        //Assume that if multiple packets first packet is VorbisComment and second packet
        //is setupheader
        if (setupPageHeader.getPacketList().size() > 1) {
            raf.skipBytes(setupPageHeader.getPacketList().get(0).getLength());
        }


        //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));


        //Read data
        if (setupPageHeader.getPacketList().size() > 1) {
            b = new byte[setupPageHeader.getPacketList().get(1).getLength()];
            raf.read(b);
            baos.write(b);
        } else {
            b = new byte[setupPageHeader.getPacketList().get(0).getLength()];
            raf.read(b);
            baos.write(b);
        }


        //Return Data
        if (!setupPageHeader.isLastPacketIncomplete() || setupPageHeader.getPacketList().size() > 2) {
//            //logger.info("Setupheader finishes on this page");
            return baos.toByteArray();
        }


        //The Setupheader extends to the next page, so should be at end of page already
        //so carry on reading pages until we get to the end of comment
        while (true) {
//            //logger.info("Reading another page");
            OggPageHeader nextPageHeader = OggPageHeader.read(raf);
            b = new byte[nextPageHeader.getPacketList().get(0).getLength()];
            raf.read(b);
            baos.write(b);


            //Because there is at least one other packet this means the Setupheader Packet has finished
            //on this page so thats all we need and we can return
            if (nextPageHeader.getPacketList().size() > 1) {
//                //logger.info("Setupheader finishes on this page");
                return baos.toByteArray();
            }


            //There is only the Setupheader packet on page if it has completed on this page we can return
            if (!nextPageHeader.isLastPacketIncomplete()) {
//                //logger.info("Setupheader finish on Page because this packet is complete");
                return baos.toByteArray();
            }
        }
    }

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        //Seek to specified offset
        raf.seek(fileOffsetOfStartingOggPage);


        //Read Page
        OggPageHeader setupPageHeader = OggPageHeader.read(raf);


        //Assume that if multiple packets first packet is VorbisComment and second packet
        //is setupheader
        if (setupPageHeader.getPacketList().size() > 1) {
            raf.skipBytes(setupPageHeader.getPacketList().get(0).getLength());
        }


        //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));


        //Read data
        if (setupPageHeader.getPacketList().size() > 1) {
            b = new byte[setupPageHeader.getPacketList().get(1).getLength()];
            raf.read(b);
            baos.write(b);
        } else {
            b = new byte[setupPageHeader.getPacketList().get(0).getLength()];
            raf.read(b);
            baos.write(b);
        }


        //Return Data
        if (!setupPageHeader.isLastPacketIncomplete() || setupPageHeader.getPacketList().size() > 2) {
//            //logger.info("Setupheader finishes on this page");
            if (setupPageHeader.getPacketList().size() > 2) {
                for (int i = 2; i < setupPageHeader.getPacketList().size(); i++) {
                    b = new byte[setupPageHeader.getPacketList().get(i).getLength()];
                    raf.read(b);
                    baos.write(b);
                }
            }
            return baos.toByteArray();
        }


        //The Setupheader extends to the next page, so should be at end of page already
        //so carry on reading pages until we get to the end of comment
        while (true) {
//            //logger.info("Reading another page");
            OggPageHeader nextPageHeader = OggPageHeader.read(raf);
            b = new byte[nextPageHeader.getPacketList().get(0).getLength()];
            raf.read(b);
            baos.write(b);


            //Because there is at least one other packet this means the Setupheader Packet has finished
            //on this page so thats all we need and we can return
            if (nextPageHeader.getPacketList().size() > 1) {
//                //logger.info("Setupheader finishes on this page");
                return baos.toByteArray();
            }


            //There is only the Setupheader packet on page if it has completed on this page we can return
            if (!nextPageHeader.isLastPacketIncomplete()) {
//                //logger.info("Setupheader finish on Page because this packet is complete");
                return baos.toByteArray();
            }
        }
    }

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Related Classes of org.jaudiotagger.audio.ogg.util.OggPageHeader

org.jaudiotagger.audio.ogg.OggFileReader

org.jaudiotagger.audio.ogg.OggVorbisTagReader

org.jaudiotagger.audio.ogg.OggVorbisTagWriter

org.jaudiotagger.audio.exceptions.CannotReadException

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