Examples of org.jaudiotagger.audio.generic.GenericAudioHeader

org.jaudiotagger.audio.generic.GenericAudioHeader
This class represents a structure for storing and retrieving information about the codec respectively the encoding parameters.
Most of the parameters are available for nearly each audio format. Some others would result in standard values.
Consider: None of the setter methods will actually affect the audio file. This is just a structure for retrieving information, not manipulating the audio file.
@author Raphael Slinckx

import java.io.RandomAccessFile;


public class WavInfoReader {
    public GenericAudioHeader read(RandomAccessFile raf) throws CannotReadException, IOException {
        // Reads wav header----------------------------------------
        GenericAudioHeader info = new GenericAudioHeader();


        if (raf.length() < 12) {
            throw new CannotReadException("This is not a WAV File (<12 bytes)");
        }
        byte[] b = new byte[12];
        raf.read(b);


        WavRIFFHeader wh = new WavRIFFHeader(b);
        if (wh.isValid()) {
            b = new byte[24];
            raf.read(b);


            WavFormatHeader wfh = new WavFormatHeader(b);
            if (wfh.isValid()) {
                // Populates
                // encodingInfo----------------------------------------------------
                info.setPreciseLength(((float) raf.length() - (float) 36) / wfh.getBytesPerSecond());
                info.setChannelNumber(wfh.getChannelNumber());
                info.setSamplingRate(wfh.getSamplingRate());
                info.setEncodingType("WAV-RIFF " + wfh.getBitrate() + " bits");
                info.setExtraEncodingInfos("");
                info.setBitrate(wfh.getBytesPerSecond() * 8 / 1000);
                info.setVariableBitRate(false);
            } else {
                throw new CannotReadException("Wav Format Header not valid");
            }
        } else {
            throw new CannotReadException("Wav RIFF Header not valid");

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                FlacFileReader reader = new FlacFileReader();
                AudioFile af1 = reader.read(trackData.getFile());
                Tag tag = af1.getTag();
                copyCommonTagFields(tag, track);
                copySpecificTagFields(tag, track);
                GenericAudioHeader audioHeader = (GenericAudioHeader) af1.getAudioHeader();
                copyHeaderFields(audioHeader, track);
            }
        } catch (Exception e) {
            System.out.println("Couldn't read file: " + trackData.getFile());
        }

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        if (mbdsi == null) {
            throw new CannotReadException("Unable to find Flac StreamInfo");
        }


        GenericAudioHeader info = new GenericAudioHeader();
        info.setLength(mbdsi.getSongLength());
        info.setPreciseLength(mbdsi.getPreciseLength());
        info.setChannelNumber(mbdsi.getChannelNumber());
        info.setSamplingRate(mbdsi.getSamplingRate());
        info.setEncodingType(mbdsi.getEncodingType());
        info.setExtraEncodingInfos("");
        info.setBitrate(computeBitrate((float) mbdsi.getPreciseLength(), raf.length() - raf.getFilePointer()));
        info.setTotalSamples(mbdsi.getTotalNumberOfSamples());
        return info;
    }

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public class OggInfoReader {
    // Logger Object
    public static Logger logger = Logger.getLogger("org.jaudiotagger.audio.ogg.atom");


    public GenericAudioHeader read(RandomAccessFile raf) throws CannotReadException, IOException {
        GenericAudioHeader info = new GenericAudioHeader();
//        //logger.fine("Started");
        long oldPos;


        //Check start of file does it have Ogg pattern
        byte[] b = new byte[OggPageHeader.CAPTURE_PATTERN.length];
        raf.read(b);
        if (!(Arrays.equals(b, OggPageHeader.CAPTURE_PATTERN))) {
            throw new CannotReadException(ErrorMessage.OGG_HEADER_CANNOT_BE_FOUND.getMsg(new String(b)));
        }


        //Now work backwards from file looking for the last ogg page, it reads the granule position for this last page
        //which must be set.
        //TODO should do buffering to cut down the number of file reads
        raf.seek(0);
        double pcmSamplesNumber = -1;
        raf.seek(raf.length() - 2);
        while (raf.getFilePointer() >= 4) {
            if (raf.read() == OggPageHeader.CAPTURE_PATTERN[3]) {
                raf.seek(raf.getFilePointer() - OggPageHeader.FIELD_CAPTURE_PATTERN_LENGTH);
                byte[] ogg = new byte[3];
                raf.readFully(ogg);
                if (ogg[0] == OggPageHeader.CAPTURE_PATTERN[0] && ogg[1] == OggPageHeader.CAPTURE_PATTERN[1] && ogg[2] == OggPageHeader.CAPTURE_PATTERN[2]) {
                    raf.seek(raf.getFilePointer() - 3);


                    oldPos = raf.getFilePointer();
                    raf.seek(raf.getFilePointer() + OggPageHeader.FIELD_PAGE_SEGMENTS_POS);
                    int pageSegments = raf.readByte() & 0xFF; //Unsigned
                    raf.seek(oldPos);


                    b = new byte[OggPageHeader.OGG_PAGE_HEADER_FIXED_LENGTH + pageSegments];
                    raf.readFully(b);


                    OggPageHeader pageHeader = new OggPageHeader(b);
                    raf.seek(0);
                    pcmSamplesNumber = pageHeader.getAbsoluteGranulePosition();
                    break;
                }
            }
            raf.seek(raf.getFilePointer() - 2);
        }


        if (pcmSamplesNumber == -1) {
            //According to spec a value of -1 indicates no packet finished on this page, this should not occur
            throw new CannotReadException(ErrorMessage.OGG_VORBIS_NO_SETUP_BLOCK.getMsg());
        }


        //1st page = Identification Header
        OggPageHeader pageHeader = OggPageHeader.read(raf);
        byte[] vorbisData = new byte[pageHeader.getPageLength()];
        raf.read(vorbisData);
        VorbisIdentificationHeader vorbisIdentificationHeader = new VorbisIdentificationHeader(vorbisData);


        //Map to generic encodingInfo
        info.setTotalSamples((long) pcmSamplesNumber);
        info.setPreciseLength((double) (pcmSamplesNumber / vorbisIdentificationHeader.getSamplingRate()));
        info.setChannelNumber(vorbisIdentificationHeader.getChannelNumber());
        info.setSamplingRate(vorbisIdentificationHeader.getSamplingRate());
        info.setEncodingType(vorbisIdentificationHeader.getEncodingType());
        info.setExtraEncodingInfos("");


        //TODO this calculation should be done within identification header
        if (vorbisIdentificationHeader.getNominalBitrate() != 0 && vorbisIdentificationHeader.getMaxBitrate() == vorbisIdentificationHeader.getNominalBitrate() && vorbisIdentificationHeader.getMinBitrate() == vorbisIdentificationHeader.getNominalBitrate()) {
            //CBR (in kbps)
            info.setBitrate(vorbisIdentificationHeader.getNominalBitrate() / 1000);
            info.setVariableBitRate(false);
        } else if (vorbisIdentificationHeader.getNominalBitrate() != 0 && vorbisIdentificationHeader.getMaxBitrate() == 0 && vorbisIdentificationHeader.getMinBitrate() == 0) {
            //Average vbr (in kpbs)
            info.setBitrate(vorbisIdentificationHeader.getNominalBitrate() / 1000);
            info.setVariableBitRate(true);
        } else {
            //TODO need to remove comment from raf.getLength()
            info.setBitrate(computeBitrate(info.getTrackLength(), raf.length()));
            info.setVariableBitRate(true);
        }
//        //logger.fine("Finished");
        return info;
    }

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Related Classes of org.jaudiotagger.audio.generic.GenericAudioHeader

com.tulskiy.musique.audio.formats.flac.FLACFileReader

org.jaudiotagger.audio.flac.FlacInfoReader

org.jaudiotagger.audio.ogg.util.OggInfoReader

org.jaudiotagger.audio.wav.util.WavInfoReader

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