1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17
18package android.media;
19
20import java.io.Closeable;
21
22/**
23 * An abstraction for a media data source, e.g. a file or an http stream
24 * {@hide}
25 */
26public interface DataSource extends Closeable {
27    /**
28     * Reads data from the data source at the requested position
29     *
30     * @param offset where in the source to read
31     * @param buffer the buffer to read the data into
32     * @param size how many bytes to read
33     * @return the number of bytes read, or -1 if there was an error
34     */
35    public int readAt(long offset, byte[] buffer, int size);
36
37    /**
38     * Gets the size of the data source.
39     *
40     * @return size of data source, or -1 if the length is unknown
41     */
42    public long getSize();
43}
44