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 18 package android.media; 19 20 import java.io.Closeable; 21 22 /** 23 * An abstraction for a media data source, e.g. a file or an http stream 24 * {@hide} 25 */ 26 public 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 */ readAt(long offset, byte[] buffer, int size)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 */ getSize()42 public long getSize(); 43 } 44