ac8bd534dd
* commit '99aec6b5d1cb73a3f5b57badc53e6f56b2a53c4d': AArch64: Use long for pointers in AmrInputStream
139 lines
4.0 KiB
Java
139 lines
4.0 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media;
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import java.io.InputStream;
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import java.io.IOException;
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/**
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* AmrInputStream
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* @hide
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*/
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public final class AmrInputStream extends InputStream
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{
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static {
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System.loadLibrary("media_jni");
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}
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private final static String TAG = "AmrInputStream";
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// frame is 20 msec at 8.000 khz
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private final static int SAMPLES_PER_FRAME = 8000 * 20 / 1000;
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// pcm input stream
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private InputStream mInputStream;
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// native handle
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private long mGae;
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// result amr stream
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private final byte[] mBuf = new byte[SAMPLES_PER_FRAME * 2];
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private int mBufIn = 0;
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private int mBufOut = 0;
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// helper for bytewise read()
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private byte[] mOneByte = new byte[1];
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/**
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* Create a new AmrInputStream, which converts 16 bit PCM to AMR
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* @param inputStream InputStream containing 16 bit PCM.
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*/
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public AmrInputStream(InputStream inputStream) {
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mInputStream = inputStream;
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mGae = GsmAmrEncoderNew();
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GsmAmrEncoderInitialize(mGae);
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}
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@Override
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public int read() throws IOException {
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int rtn = read(mOneByte, 0, 1);
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return rtn == 1 ? (0xff & mOneByte[0]) : -1;
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}
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@Override
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public int read(byte[] b) throws IOException {
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return read(b, 0, b.length);
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}
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@Override
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public int read(byte[] b, int offset, int length) throws IOException {
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if (mGae == 0) throw new IllegalStateException("not open");
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// local buffer of amr encoded audio empty
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if (mBufOut >= mBufIn) {
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// reset the buffer
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mBufOut = 0;
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mBufIn = 0;
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// fetch a 20 msec frame of pcm
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for (int i = 0; i < SAMPLES_PER_FRAME * 2; ) {
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int n = mInputStream.read(mBuf, i, SAMPLES_PER_FRAME * 2 - i);
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if (n == -1) return -1;
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i += n;
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}
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// encode it
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mBufIn = GsmAmrEncoderEncode(mGae, mBuf, 0, mBuf, 0);
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}
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// return encoded audio to user
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if (length > mBufIn - mBufOut) length = mBufIn - mBufOut;
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System.arraycopy(mBuf, mBufOut, b, offset, length);
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mBufOut += length;
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return length;
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}
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@Override
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public void close() throws IOException {
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try {
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if (mInputStream != null) mInputStream.close();
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} finally {
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mInputStream = null;
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try {
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if (mGae != 0) GsmAmrEncoderCleanup(mGae);
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} finally {
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try {
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if (mGae != 0) GsmAmrEncoderDelete(mGae);
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} finally {
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mGae = 0;
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}
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}
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}
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}
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@Override
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protected void finalize() throws Throwable {
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if (mGae != 0) {
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close();
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throw new IllegalStateException("someone forgot to close AmrInputStream");
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}
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}
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//
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// AudioRecord JNI interface
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//
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private static native long GsmAmrEncoderNew();
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private static native void GsmAmrEncoderInitialize(long gae);
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private static native int GsmAmrEncoderEncode(long gae,
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byte[] pcm, int pcmOffset, byte[] amr, int amrOffset) throws IOException;
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private static native void GsmAmrEncoderCleanup(long gae);
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private static native void GsmAmrEncoderDelete(long gae);
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}
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