android.media.AmrInputStream Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of android-all Show documentation
Show all versions of android-all Show documentation
A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* 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 java.io.InputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import android.media.MediaCodec.BufferInfo;
import android.util.Log;
/**
* AmrInputStream
* @hide
*/
public final class AmrInputStream extends InputStream {
private final static String TAG = "AmrInputStream";
// frame is 20 msec at 8.000 khz
private final static int SAMPLES_PER_FRAME = 8000 * 20 / 1000;
MediaCodec mCodec;
BufferInfo mInfo;
boolean mSawOutputEOS;
boolean mSawInputEOS;
// pcm input stream
private InputStream mInputStream;
// result amr stream
private final byte[] mBuf = new byte[SAMPLES_PER_FRAME * 2];
private int mBufIn = 0;
private int mBufOut = 0;
// helper for bytewise read()
private byte[] mOneByte = new byte[1];
/**
* Create a new AmrInputStream, which converts 16 bit PCM to AMR
* @param inputStream InputStream containing 16 bit PCM.
*/
public AmrInputStream(InputStream inputStream) {
mInputStream = inputStream;
MediaFormat format = new MediaFormat();
format.setString(MediaFormat.KEY_MIME, MediaFormat.MIMETYPE_AUDIO_AMR_NB);
format.setInteger(MediaFormat.KEY_SAMPLE_RATE, 8000);
format.setInteger(MediaFormat.KEY_CHANNEL_COUNT, 1);
format.setInteger(MediaFormat.KEY_BIT_RATE, 12200);
MediaCodecList mcl = new MediaCodecList(MediaCodecList.REGULAR_CODECS);
String name = mcl.findEncoderForFormat(format);
if (name != null) {
try {
mCodec = MediaCodec.createByCodecName(name);
mCodec.configure(format,
null /* surface */,
null /* crypto */,
MediaCodec.CONFIGURE_FLAG_ENCODE);
mCodec.start();
} catch (IOException e) {
if (mCodec != null) {
mCodec.release();
}
mCodec = null;
}
}
mInfo = new BufferInfo();
}
@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 (mCodec == null) {
throw new IllegalStateException("not open");
}
if (mBufOut >= mBufIn && !mSawOutputEOS) {
// no data left in buffer, refill it
mBufOut = 0;
mBufIn = 0;
// first push as much data into the encoder as possible
while (!mSawInputEOS) {
int index = mCodec.dequeueInputBuffer(0);
if (index < 0) {
// no input buffer currently available
break;
} else {
int numRead;
for (numRead = 0; numRead < SAMPLES_PER_FRAME * 2; ) {
int n = mInputStream.read(mBuf, numRead, SAMPLES_PER_FRAME * 2 - numRead);
if (n == -1) {
mSawInputEOS = true;
break;
}
numRead += n;
}
ByteBuffer buf = mCodec.getInputBuffer(index);
buf.put(mBuf, 0, numRead);
mCodec.queueInputBuffer(index,
0 /* offset */,
numRead,
0 /* presentationTimeUs */,
mSawInputEOS ? MediaCodec.BUFFER_FLAG_END_OF_STREAM : 0 /* flags */);
}
}
// now read encoded data from the encoder (blocking, since we just filled up the
// encoder's input with data it should be able to output at least one buffer)
while (true) {
int index = mCodec.dequeueOutputBuffer(mInfo, -1);
if (index >= 0) {
mBufIn = mInfo.size;
ByteBuffer out = mCodec.getOutputBuffer(index);
out.get(mBuf, 0 /* offset */, mBufIn /* length */);
mCodec.releaseOutputBuffer(index, false /* render */);
if ((mInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
mSawOutputEOS = true;
}
break;
}
}
}
if (mBufOut < mBufIn) {
// there is data in the buffer
if (length > mBufIn - mBufOut) {
length = mBufIn - mBufOut;
}
System.arraycopy(mBuf, mBufOut, b, offset, length);
mBufOut += length;
return length;
}
if (mSawInputEOS && mSawOutputEOS) {
// no more data available in buffer, codec or input stream
return -1;
}
// caller should try again
return 0;
}
@Override
public void close() throws IOException {
try {
if (mInputStream != null) {
mInputStream.close();
}
} finally {
mInputStream = null;
try {
if (mCodec != null) {
mCodec.release();
}
} finally {
mCodec = null;
}
}
}
@Override
protected void finalize() throws Throwable {
if (mCodec != null) {
Log.w(TAG, "AmrInputStream wasn't closed");
mCodec.release();
}
}
}