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 android.util.Log; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.InputStream; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.io.IOException; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ResampleInputStream 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @hide 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic final class ResampleInputStream extends InputStream 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static { 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.loadLibrary("media_jni"); 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final static String TAG = "ResampleInputStream"; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // pcm input stream 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private InputStream mInputStream; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sample rates, assumed to be normalized 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final int mRateIn; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final int mRateOut; 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // input pcm data 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private byte[] mBuf; 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mBufCount; 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // length of 2:1 fir 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final int mFirLength = 29; 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // helper for bytewise read() 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final byte[] mOneByte = new byte[1]; 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Create a new ResampleInputStream, which converts the sample rate 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param inputStream InputStream containing 16 bit PCM. 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rateIn the input sample rate. 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rateOut the output sample rate. 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This only handles rateIn == rateOut / 2 for the moment. 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ResampleInputStream(InputStream inputStream, int rateIn, int rateOut) { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // only support 2:1 at the moment 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rateIn != 2 * rateOut) throw new IllegalArgumentException("only support 2:1 at the moment"); 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rateIn = 2; 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rateOut = 1; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mInputStream = inputStream; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRateIn = rateIn; 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mRateOut = rateOut; 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read() throws IOException { 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int rtn = read(mOneByte, 0, 1); 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return rtn == 1 ? (0xff & mOneByte[0]) : -1; 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(byte[] b) throws IOException { 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return read(b, 0, b.length); 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int read(byte[] b, int offset, int length) throws IOException { 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mInputStream == null) throw new IllegalStateException("not open"); 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // ensure that mBuf is big enough to cover requested 'length' 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nIn = ((length / 2) * mRateIn / mRateOut + mFirLength) * 2; 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mBuf == null) { 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBuf = new byte[nIn]; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (nIn > mBuf.length) { 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] bf = new byte[nIn]; 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project System.arraycopy(mBuf, 0, bf, 0, mBufCount); 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBuf = bf; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // read until we have enough data for at least one output sample 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project while (true) { 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int len = ((mBufCount / 2 - mFirLength) * mRateOut / mRateIn) * 2; 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (len > 0) { 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project length = len < length ? len : (length / 2) * 2; 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // TODO: should mBuf.length below be nIn instead? 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int n = mInputStream.read(mBuf, mBufCount, mBuf.length - mBufCount); 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (n == -1) return -1; 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBufCount += n; 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // resample input data 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project fir21(mBuf, 0, b, offset, length / 2); 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // move any unused bytes to front of mBuf 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nFwd = length * mRateIn / mRateOut; 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mBufCount -= nFwd; 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mBufCount > 0) System.arraycopy(mBuf, nFwd, mBuf, 0, mBufCount); 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return length; 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int available() throws IOException { 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nsamples = (mIn - mOut + mInputStream.available()) / 2; 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return ((nsamples - mFirLength) * mRateOut / mRateIn) * 2; 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project*/ 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void close() throws IOException { 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mInputStream != null) mInputStream.close(); 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } finally { 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mInputStream = null; 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void finalize() throws Throwable { 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mInputStream != null) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("someone forgot to close ResampleInputStream"); 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // fir filter code JNI interface 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static native void fir21(byte[] in, int inOffset, 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project byte[] out, int outOffset, int npoints); 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 153