Android应用源码之语音压缩，android开发语音功能较多使用的时候，压缩大小50%.zi项目安卓应用源码下载p

/****************************************************************************** * * * Copyright (c) 1999-2004 Wimba S.A., All Rights Reserved. * * * * COPYRIGHT: * * This software is the property of Wimba S.A. * * This software is redistributed under the Xiph.org variant of * * the BSD license. * * Redistribution and use in source and binary forms, with or without * * modification, are permitted provided that the following conditions * * are met: * * - Redistributions of source code must retain the above copyright * * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * * notice, this list of conditions and the following disclaimer in the * * documentation and/or other materials provided with the distribution. * * - Neither the name of Wimba, the Xiph.org Foundation nor the names of * * its contributors may be used to endorse or promote products derived * * from this software without specific prior written permission. * * * * WARRANTIES: * * This software is made available by the authors in the hope * * that it will be useful, but without any warranty. * * Wimba S.A. is not liable for any consequence related to the * * use of the provided software. * * * * Class: RawWriter.java * * * * Author: Marc GIMPEL * * * * Date: 6th January 2004 * * * ******************************************************************************/ /* $Id: AudioFileWriter.java,v 1.1 2011/12/27 04:39:13 gauss Exp $ */ package com.gauss.writer.speex; import java.io.DataOutput; import java.io.File; import java.io.IOException; import java.io.OutputStream; /** * Abstract Class that defines an Audio File Writer. * * @author Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com) * @version $Revision: 1.1 $ */ public abstract class AudioFileWriter { /** * Closes the output file. * @exception IOException if there was an exception closing the Audio Writer. */ public abstract void close() throws IOException; /** * Open the output file. * @param file - file to open. * @exception IOException if there was an exception opening the Audio Writer. */ public abstract void open(File file) throws IOException; /** * Open the output file. * @param filename - file to open. * @exception IOException if there was an exception opening the Audio Writer. */ public abstract void open(String filename) throws IOException; /** * Writes the header pages that start the Ogg Speex file. * Prepares file for data to be written. * @param comment description to be included in the header. * @exception IOException */ public abstract void writeHeader(String comment) throws IOException; /** * Writes a packet of audio. * @param data audio data * @param offset the offset from which to start reading the data. * @param len the length of data to read. * @exception IOException */ public abstract void writePacket(byte[] data, int offset, int len) throws IOException; /** * Writes an Ogg Page Header to the given byte array. * @param buf the buffer to write to. * @param offset the from which to start writing. * @param headerType the header type flag * (0=normal, 2=bos: beginning of stream, 4=eos: end of stream). * @param granulepos the absolute granule position. * @param streamSerialNumber * @param pageCount * @param packetCount * @param packetSizes * @return the amount of data written to the buffer. */ public static int writeOggPageHeader(byte[] buf, int offset, int headerType, long granulepos, int streamSerialNumber, int pageCount, int packetCount, byte[] packetSizes) { writeString(buf, offset, "OggS"); // 0 - 3: capture_pattern buf[offset+4] = 0; // 4: stream_structure_version buf[offset+5] = (byte) headerType; // 5: header_type_flag writeLong(buf, offset+6, granulepos); // 6 - 13: absolute granule position writeInt(buf, offset+14, streamSerialNumber); // 14 - 17: stream serial number writeInt(buf, offset+18, pageCount); // 18 - 21: page sequence no writeInt(buf, offset+22, 0); // 22 - 25: page checksum buf[offset+26] = (byte) packetCount; // 26: page_segments System.arraycopy(packetSizes, 0, // 27 - x: segment_table buf, offset+27, packetCount); return packetCount+27; } /** * Builds and returns an Ogg Page Header. * @param headerType the header type flag * (0=normal, 2=bos: beginning of stream, 4=eos: end of stream). * @param granulepos the absolute granule position. * @param streamSerialNumber * @param pageCount * @param packetCount * @param packetSizes * @return an Ogg Page Header. */ public static byte[] buildOggPageHeader(int headerType, long granulepos, int streamSerialNumber, int pageCount, int packetCount, byte[] packetSizes) { byte[] data = new byte[packetCount+27]; writeOggPageHeader(data, 0, headerType, granulepos, streamSerialNumber, pageCount, packetCount, packetSizes); return data; } /** * Writes a Speex Header to the given byte array. * @param buf the buffer to write to. * @param offset the from which to start writing. * @param sampleRate * @param mode * @param channels * @param vbr * @param nframes * @return the amount of data written to the buffer. */ public static int writeSpeexHeader(byte[] buf, int offset, int sampleRate, int mode, int channels, boolean vbr, int nframes) { writeString(buf, offset, "Speex "); // 0 - 7: speex_string writeString(buf, offset+8, "speex-1.2rc"); // 8 - 27: speex_version System.arraycopy(new byte[11], 0, buf, offset+17, 11); // : speex_version (fill in up to 20 bytes) writeInt(buf, offset+28, 1); // 28 - 31: speex_version_id writeInt(buf, offset+32, 80); // 32 - 35: header_size writeInt(buf, offset+36, sampleRate); // 36 - 39: rate writeInt(buf, offset+40, mode); // 40 - 43: mode (0=NB, 1=WB, 2=UWB) writeInt(buf, offset+44, 4); // 44 - 47: mode_bitstream_version writeInt(buf, offset+48, channels); // 48 - 5