AviMainHeaderChunk.java
/*
* Copyright 2022 The Android Open Source Project
*
* 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 androidx.media3.extractor.avi;
import androidx.media3.common.util.ParsableByteArray;
/** Wrapper around the AVIMAINHEADER structure */
/* package */ final class AviMainHeaderChunk implements AviChunk {
private static final int AVIF_HAS_INDEX = 0x10;
public static AviMainHeaderChunk parseFrom(ParsableByteArray body) {
int microSecPerFrame = body.readLittleEndianInt();
body.skipBytes(8); // Skip dwMaxBytesPerSec (4 bytes), dwPaddingGranularity (4 bytes).
int flags = body.readLittleEndianInt();
int totalFrames = body.readLittleEndianInt();
body.skipBytes(4); // dwInitialFrames (4 bytes).
int streams = body.readLittleEndianInt();
body.skipBytes(12); // dwSuggestedBufferSize (4 bytes), dwWidth (4 bytes), dwHeight (4 bytes).
return new AviMainHeaderChunk(microSecPerFrame, flags, totalFrames, streams);
}
public final int frameDurationUs;
public final int flags;
public final int totalFrames;
public final int streams;
private AviMainHeaderChunk(int frameDurationUs, int flags, int totalFrames, int streams) {
this.frameDurationUs = frameDurationUs;
this.flags = flags;
this.totalFrames = totalFrames;
this.streams = streams;
}
@Override
public int getType() {
return AviExtractor.FOURCC_avih;
}
public boolean hasIndex() {
return (flags & AVIF_HAS_INDEX) == AVIF_HAS_INDEX;
}
}