| /* |
| * Copyright 2008 CoreMedia AG, Hamburg |
| * |
| * 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 com.coremedia.iso.boxes; |
| |
| import com.coremedia.iso.IsoTypeWriter; |
| import com.coremedia.iso.boxes.sampleentry.SampleEntry; |
| import com.googlecode.mp4parser.FullContainerBox; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * The sample description table gives detailed information about the coding type used, and any initialization |
| * information needed for that coding. <br> |
| * The information stored in the sample description box after the entry-count is both track-type specific as |
| * documented here, and can also have variants within a track type (e.g. different codings may use different |
| * specific information after some common fields, even within a video track).<br> |
| * For video tracks, a VisualSampleEntry is used; for audio tracks, an AudioSampleEntry. Hint tracks use an |
| * entry format specific to their protocol, with an appropriate name. Timed Text tracks use a TextSampleEntry |
| * For hint tracks, the sample description contains appropriate declarative data for the streaming protocol being |
| * used, and the format of the hint track. The definition of the sample description is specific to the protocol. |
| * Multiple descriptions may be used within a track.<br> |
| * The 'protocol' and 'codingname' fields are registered identifiers that uniquely identify the streaming protocol or |
| * compression format decoder to be used. A given protocol or codingname may have optional or required |
| * extensions to the sample description (e.g. codec initialization parameters). All such extensions shall be within |
| * boxes; these boxes occur after the required fields. Unrecognized boxes shall be ignored. |
| * <br> |
| * Defined in ISO/IEC 14496-12 |
| * |
| * @see com.coremedia.iso.boxes.sampleentry.VisualSampleEntry |
| * @see com.coremedia.iso.boxes.sampleentry.TextSampleEntry |
| * @see com.coremedia.iso.boxes.sampleentry.AudioSampleEntry |
| */ |
| public class SampleDescriptionBox extends FullContainerBox { |
| public static final String TYPE = "stsd"; |
| |
| public SampleDescriptionBox() { |
| super(TYPE); |
| } |
| |
| @Override |
| protected long getContentSize() { |
| return super.getContentSize() + 4; |
| } |
| |
| @Override |
| public void _parseDetails(ByteBuffer content) { |
| parseVersionAndFlags(content); |
| content.get(new byte[4]); |
| parseChildBoxes(content); |
| } |
| |
| @Override |
| protected void getContent(ByteBuffer byteBuffer) { |
| writeVersionAndFlags(byteBuffer); |
| IsoTypeWriter.writeUInt32(byteBuffer, boxes.size()); |
| writeChildBoxes(byteBuffer); |
| } |
| |
| public SampleEntry getSampleEntry() { |
| for (Box box : boxes) { |
| if (box instanceof SampleEntry) { |
| return (SampleEntry) box; |
| } |
| } |
| return null; |
| } |
| } |