WaveHeader.java revision 9066cfe9886ac131c34d59ed0e2d287b0e3c0087
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2009 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.speech.srec; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.IOException; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.InputStream; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.OutputStream; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This class represents the header of a WAVE format audio file, which usually 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * have a .wav suffix. The following integer valued fields are contained: 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <ul> 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> format - usually PCM, ALAW or ULAW. 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> numChannels - 1 for mono, 2 for stereo. 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> sampleRate - usually 8000, 11025, 16000, 22050, or 44100 hz. 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> bitsPerSample - usually 16 for PCM, 8 for ALAW, or 8 for ULAW. 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li> numBytes - size of audio data after this header, in bytes. 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </ul> 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @hide pending API council approval 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class WaveHeader { 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // follows WAVE format in http://ccrma.stanford.edu/courses/422/projects/WaveFormat 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final String TAG = "WaveHeader"; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final int HEADER_LENGTH = 44; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Indicates PCM format. */ 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final short FORMAT_PCM = 1; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Indicates ALAW format. */ 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final short FORMAT_ALAW = 6; 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Indicates ULAW format. */ 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final short FORMAT_ULAW = 7; 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private short mFormat; 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private short mNumChannels; 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mSampleRate; 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private short mBitsPerSample; 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mNumBytes; 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Construct a WaveHeader, with all fields defaulting to zero. 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader() { 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Construct a WaveHeader, with fields initialized. 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param format format of audio data, 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * one of {@link #FORMAT_PCM}, {@link #FORMAT_ULAW}, or {@link #FORMAT_ALAW}. 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numChannels 1 for mono, 2 for stereo. 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param sampleRate typically 8000, 11025, 16000, 22050, or 44100 hz. 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bitsPerSample usually 16 for PCM, 8 for ULAW or 8 for ALAW. 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numBytes size of audio data after this header, in bytes. 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader(short format, short numChannels, int sampleRate, short bitsPerSample, int numBytes) { 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat = format; 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSampleRate = sampleRate; 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumChannels = numChannels; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBitsPerSample = bitsPerSample; 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumBytes = numBytes; 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the format field. 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return format field, 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * one of {@link #FORMAT_PCM}, {@link #FORMAT_ULAW}, or {@link #FORMAT_ALAW}. 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getFormat() { 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFormat; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the format field. 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param format 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * one of {@link #FORMAT_PCM}, {@link #FORMAT_ULAW}, or {@link #FORMAT_ALAW}. 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setFormat(short format) { 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat = format; 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the number of channels. 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of channels, 1 for mono, 2 for stereo. 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getNumChannels() { 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mNumChannels; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the number of channels. 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numChannels 1 for mono, 2 for stereo. 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setNumChannels(short numChannels) { 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumChannels = numChannels; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the sample rate. 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return sample rate, typically 8000, 11025, 16000, 22050, or 44100 hz. 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getSampleRate() { 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSampleRate; 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the sample rate. 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param sampleRate sample rate, typically 8000, 11025, 16000, 22050, or 44100 hz. 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setSampleRate(int sampleRate) { 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSampleRate = sampleRate; 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the number of bits per sample. 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of bits per sample, 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * usually 16 for PCM, 8 for ULAW or 8 for ALAW. 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getBitsPerSample() { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mBitsPerSample; 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the number of bits per sample. 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bitsPerSample number of bits per sample, 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * usually 16 for PCM, 8 for ULAW or 8 for ALAW. 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setBitsPerSample(short bitsPerSample) { 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBitsPerSample = bitsPerSample; 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the size of audio data after this header, in bytes. 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return size of audio data after this header, in bytes. 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getNumBytes() { 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mNumBytes; 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the size of audio data after this header, in bytes. 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numBytes size of audio data after this header, in bytes. 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setNumBytes(int numBytes) { 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumBytes = numBytes; 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Read and initialize a WaveHeader. 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param in {@link java.io.InputStream} to read from. 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of bytes consumed. 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws IOException 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(InputStream in) throws IOException { 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* RIFF header */ 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "RIFF"); 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int numBytes = readInt(in) - 36; 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "WAVE"); 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* fmt chunk */ 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "fmt "); 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (16 != readInt(in)) throw new IOException("fmt chunk length not 16"); 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat = readShort(in); 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumChannels = readShort(in); 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSampleRate = readInt(in); 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int byteRate = readInt(in); 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project short blockAlign = readShort(in); 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBitsPerSample = readShort(in); 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (byteRate != mNumChannels * mSampleRate * mBitsPerSample / 8) { 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("fmt.ByteRate field inconsistent"); 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (blockAlign != mNumChannels * mBitsPerSample / 8) { 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("fmt.BlockAlign field inconsistent"); 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* data chunk */ 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "data"); 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumBytes = readInt(in); 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return HEADER_LENGTH; 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void readId(InputStream in, String id) throws IOException { 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < id.length(); i++) { 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (id.charAt(i) != in.read()) throw new IOException( id + " tag not present"); 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static int readInt(InputStream in) throws IOException { 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return in.read() | (in.read() << 8) | (in.read() << 16) | (in.read() << 24); 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static short readShort(InputStream in) throws IOException { 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (short)(in.read() | (in.read() << 8)); 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Write a WAVE file header. 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param out {@link java.io.OutputStream} to receive the header. 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of bytes written. 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws IOException 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int write(OutputStream out) throws IOException { 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* RIFF header */ 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "RIFF"); 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, 36 + mNumBytes); 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "WAVE"); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* fmt chunk */ 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "fmt "); 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, 16); 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, mFormat); 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, mNumChannels); 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, mSampleRate); 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, mNumChannels * mSampleRate * mBitsPerSample / 8); 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, (short)(mNumChannels * mBitsPerSample / 8)); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, mBitsPerSample); 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* data chunk */ 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "data"); 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, mNumBytes); 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return HEADER_LENGTH; 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void writeId(OutputStream out, String id) throws IOException { 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < id.length(); i++) out.write(id.charAt(i)); 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void writeInt(OutputStream out, int val) throws IOException { 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 0); 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 8); 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 16); 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 24); 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void writeShort(OutputStream out, short val) throws IOException { 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 0); 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 8); 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String toString() { 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return String.format( 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project "WaveHeader format=%d numChannels=%d sampleRate=%d bitsPerSample=%d numBytes=%d", 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat, mNumChannels, mSampleRate, mBitsPerSample, mNumBytes); 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 275