auto import from //depot/cupcake/@135843

media/java/android/media/ResampleInputStream.java

@@ -1,153 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.media;
-
-import android.util.Config;
-import android.util.Log;
-
-import java.io.InputStream;
-import java.io.IOException;
-
-
-/**
- * ResampleInputStream
- * @hide
- */
-public final class ResampleInputStream extends InputStream
-{    
-    static {
-        System.loadLibrary("media_jni");
-    }
-    
-    private final static String TAG = "ResampleInputStream";
-    
-    // pcm input stream
-    private InputStream mInputStream;
-
-    // sample rates, assumed to be normalized
-    private final int mRateIn;
-    private final int mRateOut;
-    
-    // input pcm data
-    private byte[] mBuf;
-    private int mBufCount;
-    
-    // length of 2:1 fir
-    private static final int mFirLength = 29;
-    
-    // helper for bytewise read()
-    private final byte[] mOneByte = new byte[1];
-    
-    /**
-     * Create a new ResampleInputStream, which converts the sample rate
-     * @param inputStream InputStream containing 16 bit PCM.
-     * @param rateIn the input sample rate.
-     * @param rateOut the output sample rate.
-     * This only handles rateIn == rateOut / 2 for the moment.
-     */
-    public ResampleInputStream(InputStream inputStream, int rateIn, int rateOut) {
-        // only support 2:1 at the moment
-        if (rateIn != 2 * rateOut) throw new IllegalArgumentException("only support 2:1 at the moment");
-        rateIn = 2;
-        rateOut = 1;
-
-        mInputStream = inputStream;
-        mRateIn = rateIn;
-        mRateOut = rateOut;
-    }
-
-    @Override
-    public int read() throws IOException {
-        int rtn = read(mOneByte, 0, 1);
-        return rtn == 1 ? (0xff & mOneByte[0]) : -1;
-    }
-    
-    @Override
-    public int read(byte[] b) throws IOException {
-        return read(b, 0, b.length);
-    }
-
-    @Override
-    public int read(byte[] b, int offset, int length) throws IOException {
-        if (mInputStream == null) throw new IllegalStateException("not open");
-
-        // ensure that mBuf is big enough to cover requested 'length'
-        int nIn = ((length / 2) * mRateIn / mRateOut + mFirLength) * 2;
-        if (mBuf == null) {
-            mBuf = new byte[nIn];
-        } else if (nIn > mBuf.length) {
-            byte[] bf = new byte[nIn];
-            System.arraycopy(mBuf, 0, bf, 0, mBufCount);
-            mBuf = bf;
-        }
-        
-        // read until we have enough data for at least one output sample
-        while (true) {
-            int len = ((mBufCount / 2 - mFirLength) * mRateOut / mRateIn) * 2;
-            if (len > 0) {
-                length = len < length ? len : (length / 2) * 2;
-                break;
-            }
-            // TODO: should mBuf.length below be nIn instead?
-            int n = mInputStream.read(mBuf, mBufCount, mBuf.length - mBufCount);
-            if (n == -1) return -1;
-            mBufCount += n;
-        }
-
-        // resample input data
-        fir21(mBuf, 0, b, offset, length / 2);
-        
-        // move any unused bytes to front of mBuf
-        int nFwd = length * mRateIn / mRateOut;
-        mBufCount -= nFwd;
-        if (mBufCount > 0) System.arraycopy(mBuf, nFwd, mBuf, 0, mBufCount);
-        
-        return length;
-    }
-
-/*
-    @Override
-    public int available() throws IOException {
-        int nsamples = (mIn - mOut + mInputStream.available()) / 2;
-        return ((nsamples - mFirLength) * mRateOut / mRateIn) * 2;
-    }
-*/
-
-    @Override
-    public void close() throws IOException {
-        try {
-            if (mInputStream != null) mInputStream.close();
-        } finally {
-            mInputStream = null;
-        }
-    }
-
-    @Override
-    protected void finalize() throws Throwable {
-        if (mInputStream != null) {
-            close();
-            throw new IllegalStateException("someone forgot to close ResampleInputStream");
-        }
-    }
-
-    //
-    // fir filter code JNI interface
-    //
-    private static native void fir21(byte[] in, int inOffset,
-            byte[] out, int outOffset, int npoints);
-
-}