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A generic parser and writer for all ISO 14496 based files (MP4, Quicktime, DCF, PDCF, ...)

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/*  
 * 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.BoxParser;
import com.coremedia.iso.IsoTypeReader;
import com.coremedia.iso.IsoTypeWriter;
import com.coremedia.iso.boxes.sampleentry.AbstractSampleEntry;
import com.googlecode.mp4parser.AbstractContainerBox;

import java.io.IOException;
import java.nio.ByteBuffer;

import com.googlecode.mp4parser.DataSource;

import java.nio.channels.WritableByteChannel;

/**
 * 

4cc = "{@value #TYPE}"

* The sample description table gives detailed information about the coding type used, and any initialization * information needed for that coding.
* 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).
* 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.
* 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. *
* 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 AbstractContainerBox implements FullBox { public static final String TYPE = "stsd"; public SampleDescriptionBox() { super(TYPE); } private int version; private int flags; public int getVersion() { return version; } public void setVersion(int version) { this.version = version; } public int getFlags() { return flags; } public void setFlags(int flags) { this.flags = flags; } @Override public void parse(DataSource dataSource, ByteBuffer header, long contentSize, BoxParser boxParser) throws IOException { ByteBuffer versionFlagNumOfChildBoxes = ByteBuffer.allocate(8); dataSource.read(versionFlagNumOfChildBoxes); versionFlagNumOfChildBoxes.rewind(); version = IsoTypeReader.readUInt8(versionFlagNumOfChildBoxes); flags = IsoTypeReader.readUInt24(versionFlagNumOfChildBoxes); // number of child boxes is not required initContainer(dataSource, contentSize - 8, boxParser); } @Override public void getBox(WritableByteChannel writableByteChannel) throws IOException { writableByteChannel.write(getHeader()); ByteBuffer versionFlagNumOfChildBoxes = ByteBuffer.allocate(8); IsoTypeWriter.writeUInt8(versionFlagNumOfChildBoxes, version); IsoTypeWriter.writeUInt24(versionFlagNumOfChildBoxes, flags); IsoTypeWriter.writeUInt32(versionFlagNumOfChildBoxes, getBoxes().size()); writableByteChannel.write((ByteBuffer) versionFlagNumOfChildBoxes.rewind()); writeContainer(writableByteChannel); } public AbstractSampleEntry getSampleEntry() { for (AbstractSampleEntry box : getBoxes(AbstractSampleEntry.class)) { return box; } return null; } @Override public long getSize() { long s = getContainerSize(); long t = 8; return s + t + ((largeBox || (s + t + 8) >= (1L << 32)) ? 16 : 8); } }




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