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> 33935ae463d495d41155e27feb849768ad2b8b16dbDianne Hackborn * 34935ae463d495d41155e27feb849768ad2b8b16dbDianne Hackborn * Not yet ready to be supported, so 35935ae463d495d41155e27feb849768ad2b8b16dbDianne Hackborn * @hide 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class WaveHeader { 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // follows WAVE format in http://ccrma.stanford.edu/courses/422/projects/WaveFormat 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final String TAG = "WaveHeader"; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final int HEADER_LENGTH = 44; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Indicates PCM format. */ 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final short FORMAT_PCM = 1; 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Indicates ALAW format. */ 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final short FORMAT_ALAW = 6; 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** Indicates ULAW format. */ 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final short FORMAT_ULAW = 7; 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private short mFormat; 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private short mNumChannels; 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mSampleRate; 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private short mBitsPerSample; 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mNumBytes; 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Construct a WaveHeader, with all fields defaulting to zero. 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader() { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Construct a WaveHeader, with fields initialized. 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param format format of audio data, 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * one of {@link #FORMAT_PCM}, {@link #FORMAT_ULAW}, or {@link #FORMAT_ALAW}. 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numChannels 1 for mono, 2 for stereo. 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param sampleRate typically 8000, 11025, 16000, 22050, or 44100 hz. 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bitsPerSample usually 16 for PCM, 8 for ULAW or 8 for ALAW. 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numBytes size of audio data after this header, in bytes. 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader(short format, short numChannels, int sampleRate, short bitsPerSample, int numBytes) { 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat = format; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSampleRate = sampleRate; 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumChannels = numChannels; 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBitsPerSample = bitsPerSample; 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumBytes = numBytes; 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the format field. 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return format field, 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * one of {@link #FORMAT_PCM}, {@link #FORMAT_ULAW}, or {@link #FORMAT_ALAW}. 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getFormat() { 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFormat; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the format field. 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param format 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * one of {@link #FORMAT_PCM}, {@link #FORMAT_ULAW}, or {@link #FORMAT_ALAW}. 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setFormat(short format) { 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat = format; 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the number of channels. 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of channels, 1 for mono, 2 for stereo. 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getNumChannels() { 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mNumChannels; 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the number of channels. 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numChannels 1 for mono, 2 for stereo. 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setNumChannels(short numChannels) { 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumChannels = numChannels; 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the sample rate. 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return sample rate, typically 8000, 11025, 16000, 22050, or 44100 hz. 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getSampleRate() { 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSampleRate; 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the sample rate. 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param sampleRate sample rate, typically 8000, 11025, 16000, 22050, or 44100 hz. 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setSampleRate(int sampleRate) { 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSampleRate = sampleRate; 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the number of bits per sample. 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of bits per sample, 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * usually 16 for PCM, 8 for ULAW or 8 for ALAW. 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public short getBitsPerSample() { 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mBitsPerSample; 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the number of bits per sample. 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bitsPerSample number of bits per sample, 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * usually 16 for PCM, 8 for ULAW or 8 for ALAW. 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setBitsPerSample(short bitsPerSample) { 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBitsPerSample = bitsPerSample; 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Get the size of audio data after this header, in bytes. 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return size of audio data after this header, in bytes. 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getNumBytes() { 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mNumBytes; 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set the size of audio data after this header, in bytes. 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param numBytes size of audio data after this header, in bytes. 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return reference to this WaveHeader instance. 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public WaveHeader setNumBytes(int numBytes) { 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumBytes = numBytes; 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return this; 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Read and initialize a WaveHeader. 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param in {@link java.io.InputStream} to read from. 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of bytes consumed. 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws IOException 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(InputStream in) throws IOException { 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* RIFF header */ 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "RIFF"); 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int numBytes = readInt(in) - 36; 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "WAVE"); 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* fmt chunk */ 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "fmt "); 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (16 != readInt(in)) throw new IOException("fmt chunk length not 16"); 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat = readShort(in); 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumChannels = readShort(in); 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSampleRate = readInt(in); 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int byteRate = readInt(in); 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project short blockAlign = readShort(in); 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBitsPerSample = readShort(in); 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (byteRate != mNumChannels * mSampleRate * mBitsPerSample / 8) { 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("fmt.ByteRate field inconsistent"); 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (blockAlign != mNumChannels * mBitsPerSample / 8) { 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IOException("fmt.BlockAlign field inconsistent"); 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* data chunk */ 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project readId(in, "data"); 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNumBytes = readInt(in); 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return HEADER_LENGTH; 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void readId(InputStream in, String id) throws IOException { 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < id.length(); i++) { 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (id.charAt(i) != in.read()) throw new IOException( id + " tag not present"); 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static int readInt(InputStream in) throws IOException { 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return in.read() | (in.read() << 8) | (in.read() << 16) | (in.read() << 24); 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static short readShort(InputStream in) throws IOException { 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (short)(in.read() | (in.read() << 8)); 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Write a WAVE file header. 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param out {@link java.io.OutputStream} to receive the header. 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return number of bytes written. 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws IOException 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int write(OutputStream out) throws IOException { 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* RIFF header */ 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "RIFF"); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, 36 + mNumBytes); 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "WAVE"); 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* fmt chunk */ 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "fmt "); 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, 16); 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, mFormat); 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, mNumChannels); 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, mSampleRate); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, mNumChannels * mSampleRate * mBitsPerSample / 8); 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, (short)(mNumChannels * mBitsPerSample / 8)); 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeShort(out, mBitsPerSample); 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* data chunk */ 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeId(out, "data"); 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project writeInt(out, mNumBytes); 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return HEADER_LENGTH; 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void writeId(OutputStream out, String id) throws IOException { 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < id.length(); i++) out.write(id.charAt(i)); 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void writeInt(OutputStream out, int val) throws IOException { 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 0); 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 8); 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 16); 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 24); 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static void writeShort(OutputStream out, short val) throws IOException { 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 0); 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project out.write(val >> 8); 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String toString() { 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return String.format( 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project "WaveHeader format=%d numChannels=%d sampleRate=%d bitsPerSample=%d numBytes=%d", 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFormat, mNumChannels, mSampleRate, mBitsPerSample, mNumBytes); 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 277