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/*
* Copyright 2002-2017 Drew Noakes
*
* 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.
*
* More information about this project is available at:
*
* https://drewnoakes.com/code/exif/
* https://github.com/drewnoakes/metadata-extractor
*/
package com.drew.metadata.avi;
import com.drew.imaging.riff.RiffHandler;
import com.drew.lang.ByteArrayReader;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Metadata;
import java.io.IOException;
/**
* Implementation of {@link RiffHandler} specialising in AVI support.
*
* Extracts data from chunk/list types:
*
* <ul>
* <li><code>"avih"</code>: width, height, streams</li>
* <li><code>"strh"</code>: frames/second, samples/second, duration, video codec</li>
* </ul>
*
* Sources: http://www.alexander-noe.com/video/documentation/avi.pdf
* https://msdn.microsoft.com/en-us/library/ms899422.aspx
* https://www.loc.gov/preservation/digital/formats/fdd/fdd000025.shtml
*
* @author Payton Garland
*/
public class AviRiffHandler implements RiffHandler
{
@NotNull
private final AviDirectory _directory;
// @NotNull
// private String _currentList = "";
public AviRiffHandler(@NotNull Metadata metadata)
{
_directory = new AviDirectory();
metadata.addDirectory(_directory);
}
public boolean shouldAcceptRiffIdentifier(@NotNull String identifier)
{
return identifier.equals(AviDirectory.FORMAT);
}
public boolean shouldAcceptChunk(@NotNull String fourCC)
{
return fourCC.equals(AviDirectory.CHUNK_STREAM_HEADER)
|| fourCC.equals(AviDirectory.CHUNK_MAIN_HEADER);
}
public boolean shouldAcceptList(@NotNull String fourCC)
{
// if (fourCC.equals(AviDirectory.LIST_HEADER) || fourCC.equals(AviDirectory.LIST_STREAM_HEADER) || fourCC.equals(AviDirectory.FORMAT)) {
// _currentList = fourCC;
// } else {
// _currentList = "";
// }
return fourCC.equals(AviDirectory.LIST_HEADER)
|| fourCC.equals(AviDirectory.LIST_STREAM_HEADER)
|| fourCC.equals(AviDirectory.FORMAT);
}
public void processChunk(@NotNull String fourCC, @NotNull byte[] payload)
{
try {
if (fourCC.equals(AviDirectory.CHUNK_STREAM_HEADER)) {
ByteArrayReader reader = new ByteArrayReader(payload);
reader.setMotorolaByteOrder(false);
String fccType = new String(reader.getBytes(0, 4));
String fccHandler = new String(reader.getBytes(4, 4));
// int dwFlags = reader.getInt32(8);
// int wPriority = reader.getInt16(12);
// int wLanguage = reader.getInt16(14);
// int dwInitialFrames = reader.getInt32(16);
float dwScale = reader.getFloat32(20);
float dwRate = reader.getFloat32(24);
// int dwStart = reader.getInt32(28);
int dwLength = reader.getInt32(32);
// int dwSuggestedBufferSize = reader.getInt32(36);
// int dwQuality = reader.getInt32(40);
// int dwSampleSize = reader.getInt32(44);
// byte[] rcFrame = reader.getBytes(48, 2);
if (fccType.equals("vids")) {
if (!_directory.containsTag(AviDirectory.TAG_FRAMES_PER_SECOND)) {
_directory.setDouble(AviDirectory.TAG_FRAMES_PER_SECOND, (dwRate / dwScale));
double duration = dwLength / (dwRate / dwScale);
Integer hours = (int) duration / (int) (Math.pow(60, 2));
Integer minutes = ((int) duration / (int) (Math.pow(60, 1))) - (hours * 60);
Integer seconds = (int) Math.round((duration / (Math.pow(60, 0))) - (minutes * 60));
String time = String.format("%1$02d:%2$02d:%3$02d", hours, minutes, seconds);
_directory.setString(AviDirectory.TAG_DURATION, time);
_directory.setString(AviDirectory.TAG_VIDEO_CODEC, fccHandler);
}
} else if (fccType.equals("auds")) {
if (!_directory.containsTag(AviDirectory.TAG_SAMPLES_PER_SECOND)) {
_directory.setDouble(AviDirectory.TAG_SAMPLES_PER_SECOND, (dwRate / dwScale));
}
}
} else if (fourCC.equals(AviDirectory.CHUNK_MAIN_HEADER)) {
ByteArrayReader reader = new ByteArrayReader(payload);
reader.setMotorolaByteOrder(false);
// int dwMicroSecPerFrame = reader.getInt32(0);
// int dwMaxBytesPerSec = reader.getInt32(4);
// int dwPaddingGranularity = reader.getInt32(8);
// int dwFlags = reader.getInt32(12);
// int dwTotalFrames = reader.getInt32(16);
// int dwInitialFrames = reader.getInt32(20);
int dwStreams = reader.getInt32(24);
// int dwSuggestedBufferSize = reader.getInt32(28);
int dwWidth = reader.getInt32(32);
int dwHeight = reader.getInt32(36);
// byte[] dwReserved = reader.getBytes(40, 4);
_directory.setInt(AviDirectory.TAG_WIDTH, dwWidth);
_directory.setInt(AviDirectory.TAG_HEIGHT, dwHeight);
_directory.setInt(AviDirectory.TAG_STREAMS, dwStreams);
}
} catch (IOException ex) {
_directory.addError(ex.getMessage());
}
}
}
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