Revert "Remove AmrInputStream"

This reverts commit 0c3518cc7724df29b790d9d81af9a105e7958cf7.

Change-Id: I250d86d2d6ce462cb5f29bc6c312d88a49ac24a4

diff --git a/media/java/android/media/AmrInputStream.java b/media/java/android/media/AmrInputStream.java
new file mode 100644 (file)
index 0000000..fb91bbb
--- /dev/null
+++ b/media/java/android/media/AmrInputStream.java
@@ -0,0 +1,195 @@
+/*
+ * 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();
+        }
+    }
+}