java实现网络音频 视频通信

/* * AMAudioFormat.java */ /* * Copyright (c) 2001 by Florian Bomers <florian@bome.com> * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ //TODO: enable dynamic change of audio format - especially for owner client... package com.audio; 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 ***/