/*
* 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.C;
import androidx.media3.common.util.Log;
import androidx.media3.common.util.ParsableByteArray;
import androidx.media3.common.util.Util;
/** Parses and holds information from the AVISTREAMHEADER structure. */
/* package */ final class AviStreamHeaderChunk implements AviChunk {
private static final String TAG = "AviStreamHeaderChunk";
public static AviStreamHeaderChunk parseFrom(ParsableByteArray body) {
int streamType = body.readLittleEndianInt();
body.skipBytes(12); // fccHandler (4 bytes), dwFlags (4 bytes), wPriority (2 bytes),
// wLanguage (2 bytes).
int initialFrames = body.readLittleEndianInt();
int scale = body.readLittleEndianInt();
int rate = body.readLittleEndianInt();
body.skipBytes(4); // dwStart (4 bytes).
int length = body.readLittleEndianInt();
int suggestedBufferSize = body.readLittleEndianInt();
body.skipBytes(8); // dwQuality (4 bytes), dwSampleSize (4 bytes).
return new AviStreamHeaderChunk(
streamType, initialFrames, scale, rate, length, suggestedBufferSize);
}
public final int streamType;
public final int initialFrames;
public final int scale;
public final int rate;
public final int length;
public final int suggestedBufferSize;
private AviStreamHeaderChunk(
int streamType, int initialFrames, int scale, int rate, int length, int suggestedBufferSize) {
this.streamType = streamType;
this.initialFrames = initialFrames;
this.scale = scale;
this.rate = rate;
this.length = length;
this.suggestedBufferSize = suggestedBufferSize;
}
@Override
public int getType() {
return AviExtractor.FOURCC_strh;
}
public @C.TrackType int getTrackType() {
switch (streamType) {
case AviExtractor.FOURCC_auds:
return C.TRACK_TYPE_AUDIO;
case AviExtractor.FOURCC_vids:
return C.TRACK_TYPE_VIDEO;
case AviExtractor.FOURCC_txts:
return C.TRACK_TYPE_TEXT;
default:
Log.w(TAG, "Found unsupported streamType fourCC: " + Integer.toHexString(streamType));
return C.TRACK_TYPE_UNKNOWN;
}
}
public float getFrameRate() {
return rate / (float) scale;
}
public long getDurationUs() {
return Util.scaleLargeTimestamp(
/* timestamp= */ length,
/* multiplier= */ C.MICROS_PER_SECOND * scale,
/* divisor= */ rate);
}
}