19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2008 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.media; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.InputStream; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.IOException; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ResampleInputStream 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @hide 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic final class ResampleInputStream extends InputStream 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static { 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.loadLibrary("media_jni"); 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final static String TAG = "ResampleInputStream"; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // pcm input stream 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private InputStream mInputStream; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sample rates, assumed to be normalized 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final int mRateIn; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final int mRateOut; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // input pcm data 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private byte[] mBuf; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mBufCount; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // length of 2:1 fir 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final int mFirLength = 29; 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // helper for bytewise read() 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final byte[] mOneByte = new byte[1]; 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Create a new ResampleInputStream, which converts the sample rate 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param inputStream InputStream containing 16 bit PCM. 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rateIn the input sample rate. 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rateOut the output sample rate. 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This only handles rateIn == rateOut / 2 for the moment. 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ResampleInputStream(InputStream inputStream, int rateIn, int rateOut) { 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // only support 2:1 at the moment 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rateIn != 2 * rateOut) throw new IllegalArgumentException("only support 2:1 at the moment"); 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rateIn = 2; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rateOut = 1; 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mInputStream = inputStream; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRateIn = rateIn; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRateOut = rateOut; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read() throws IOException { 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int rtn = read(mOneByte, 0, 1); 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return rtn == 1 ? (0xff & mOneByte[0]) : -1; 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(byte[] b) throws IOException { 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return read(b, 0, b.length); 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(byte[] b, int offset, int length) throws IOException { 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mInputStream == null) throw new IllegalStateException("not open"); 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // ensure that mBuf is big enough to cover requested 'length' 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nIn = ((length / 2) * mRateIn / mRateOut + mFirLength) * 2; 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mBuf == null) { 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBuf = new byte[nIn]; 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (nIn > mBuf.length) { 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] bf = new byte[nIn]; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.arraycopy(mBuf, 0, bf, 0, mBufCount); 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBuf = bf; 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // read until we have enough data for at least one output sample 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project while (true) { 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int len = ((mBufCount / 2 - mFirLength) * mRateOut / mRateIn) * 2; 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (len > 0) { 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project length = len < length ? len : (length / 2) * 2; 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // TODO: should mBuf.length below be nIn instead? 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int n = mInputStream.read(mBuf, mBufCount, mBuf.length - mBufCount); 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (n == -1) return -1; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBufCount += n; 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // resample input data 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project fir21(mBuf, 0, b, offset, length / 2); 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // move any unused bytes to front of mBuf 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nFwd = length * mRateIn / mRateOut; 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBufCount -= nFwd; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mBufCount > 0) System.arraycopy(mBuf, nFwd, mBuf, 0, mBufCount); 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return length; 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int available() throws IOException { 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nsamples = (mIn - mOut + mInputStream.available()) / 2; 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return ((nsamples - mFirLength) * mRateOut / mRateIn) * 2; 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project*/ 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void close() throws IOException { 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mInputStream != null) mInputStream.close(); 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } finally { 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mInputStream = null; 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void finalize() throws Throwable { 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mInputStream != null) { 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(); 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("someone forgot to close ResampleInputStream"); 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // fir filter code JNI interface 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static native void fir21(byte[] in, int inOffset, 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] out, int outOffset, int npoints); 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 151