amaudioformat.java

实现了语音聊天和文字聊天的p2p聊天工具

package audio;


/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
import	javax.sound.sampled.*;

public class AMAudioFormat {

        public static final int FORMAT_CODE_CD=1;
        public static final int FORMAT_CODE_FM=2;
        public static final int FORMAT_CODE_TELEPHONE=3;
        public static final int FORMAT_CODE_GSM=4;

        public static final String[] FORMAT_NAMES={
                "Cell phone GSM (13.2KBit/s - Modem)",
                "Telephone ulaw (64KBit/s - ISDN)",
                "FM quality mono (352.8KBit/s - ADSL)",
                "CD quality mono (705.6KBit/s - LAN)"
        };

        public static final int[] FORMAT_CODES={
                FORMAT_CODE_GSM,
                FORMAT_CODE_TELEPHONE,
                FORMAT_CODE_FM,
                FORMAT_CODE_CD
        };

        public static final int FORMAT_CODE_DEFAULT=FORMAT_CODE_GSM;

        private static int SAMPLE_RATE;
        private static float LINE_FRAME_SIZE=2.0f; // always using lines with 16 bit
        private static float NET_BYTES_PER_SAMPLE;

        // quick look-up tables
        private static final float[] netFrameSize={
                1, // nothing
                2, // CD
                2, // FM
                1, // Telephone
                33.0f // GSM
        };

        private static final float[] netSampleRate={
                1.0f,  // nothing
                44100.0f, // CD
                22050.0f, // FM
                8000.0f,  // Telephone
                8000.0f   // GSM
        };

        private static final float[] netFrameRate={
                1.0f,  // nothing
                44100.0f, // CD
                22050.0f, // FM
                8000.0f,  // Telephone
                50.0f   // GSM
        };

        public static long lineBytes2Ms(long bytes) {
                return (long) (bytes/LINE_FRAME_SIZE*1000/SAMPLE_RATE);
        }

        public static long netBytes2Ms(long bytes, int formatCode) {
                return (long) (bytes/netFrameRate[formatCode]*1000/netFrameSize[formatCode]);
        }

        public static long bytes2Ms(long bytes, AudioFormat format) {
                return (long) (bytes/format.getFrameRate()*1000/format.getFrameSize());
        }

        public static long ms2Bytes(long ms, AudioFormat format) {
                return (long) (ms*format.getFrameRate()/1000*format.getFrameSize());
        }

        public static AudioFormat getLineAudioFormat(int formatCode) {
                return getLineAudioFormat(netSampleRate[formatCode]);
        }

        public static AudioFormat getLineAudioFormat(float sampleRate) {
                return new AudioFormat(
                 AudioFormat.Encoding.PCM_SIGNED,
                 sampleRate,    // sampleRate
                 16,            // sampleSizeInBits
                 1,             // channels
                 2,             // frameSize
                 sampleRate,    // frameRate
                 false);        // bigEndian
                 // ulaw conversion does not work with Sun's ulaw provider if big endian...
        }

        public static AudioFormat getNetAudioFormat(int nformat) throws UnsupportedAudioFileException {
                if (nformat==FORMAT_CODE_CD) {
                        return new AudioFormat(
                 AudioFormat.Encoding.PCM_SIGNED,
                 44100.0f,   // sampleRate
                 16,            // sampleSizeInBits
                 1,             // channels
                 2,             // frameSize
                 44100.0f,      // frameRate
                 true);         // bigEndian
                }
                else if (nformat==FORMAT_CODE_FM) {
                        return new AudioFormat(
                 AudioFormat.Encoding.PCM_SIGNED,
                 22050.0f,   // sampleRate
                 16,            // sampleSizeInBits
                 1,             // channels
                 2,             // frameSize
                 22050.0f,      // frameRate
                 true);         // bigEndian
                }
                else if (nformat==FORMAT_CODE_TELEPHONE) {
                        return new AudioFormat(
                 AudioFormat.Encoding.ULAW,
                 8000.0f,       // sampleRate
                 8,             // sampleSizeInBits
                 1,             // channels
                 1,             // frameSize
                 8000.0f,       // frameRate
                 false);        // bigEndian
                }
                else if (nformat==FORMAT_CODE_GSM) {
                        try {
                                Class.forName("org.tritonus.share.sampled.Encodings");
                        } catch (ClassNotFoundException cnfe) {
                                throw new RuntimeException("Tritonus shared classes not properly installed!");
                        }
                        return new AudioFormat(
                                org.tritonus.share.sampled.Encodings.getEncoding("GSM0610"),
                                8000.0F,        // sampleRate
                                -1,             // sampleSizeInBits
                                1,              // channels
                                33,             // frameSize
                                50.0F,          // frameRate
                                false);         // bigEndian
                }
                throw new RuntimeException("Wrong format code!");
        }

        public static int getFormatCode(AudioFormat format) {
                AudioFormat.Encoding encoding = format.getEncoding();
                // very simple check...
                if (encoding.equals(AudioFormat.Encoding.PCM_SIGNED)) {
                        if (format.getSampleRate()==44100.0f) {
                                return FORMAT_CODE_CD;
                        } else {
                                return FORMAT_CODE_FM;
                        }
                }
                if (encoding.equals(AudioFormat.Encoding.ULAW)) {
                        return FORMAT_CODE_TELEPHONE;
                }
                if (encoding.equals(org.tritonus.share.sampled.Encodings.getEncoding("GSM0610"))) {
                        return FORMAT_CODE_GSM;
                }
                throw new RuntimeException("Wrong Format");
        }

}

/*** AMAudioFormat.java ***/