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/*
* Copyright (C) 2016 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 org.mozilla.thirdparty.com.google.android.exoplayer2.extractor.mp4;
import androidx.annotation.IntDef;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* Encapsulates information describing an MP4 track.
*/
public final class Track {
/**
* The transformation to apply to samples in the track, if any. One of {@link
* #TRANSFORMATION_NONE} or {@link #TRANSFORMATION_CEA608_CDAT}.
*/
@Documented
@Retention(RetentionPolicy.SOURCE)
@IntDef({TRANSFORMATION_NONE, TRANSFORMATION_CEA608_CDAT})
public @interface Transformation {}
/**
* A no-op sample transformation.
*/
public static final int TRANSFORMATION_NONE = 0;
/**
* A transformation for caption samples in cdat atoms.
*/
public static final int TRANSFORMATION_CEA608_CDAT = 1;
/**
* The track identifier.
*/
public final int id;
/**
* One of {@link C#TRACK_TYPE_AUDIO}, {@link C#TRACK_TYPE_VIDEO} and {@link C#TRACK_TYPE_TEXT}.
*/
public final int type;
/**
* The track timescale, defined as the number of time units that pass in one second.
*/
public final long timescale;
/**
* The movie timescale.
*/
public final long movieTimescale;
/**
* The duration of the track in microseconds, or {@link C#TIME_UNSET} if unknown.
*/
public final long durationUs;
/**
* The format.
*/
public final Format format;
/**
* One of {@code TRANSFORMATION_*}. Defines the transformation to apply before outputting each
* sample.
*/
@Transformation public final int sampleTransformation;
/**
* Durations of edit list segments in the movie timescale. Null if there is no edit list.
*/
@Nullable public final long[] editListDurations;
/**
* Media times for edit list segments in the track timescale. Null if there is no edit list.
*/
@Nullable public final long[] editListMediaTimes;
/**
* For H264 video tracks, the length in bytes of the NALUnitLength field in each sample. 0 for
* other track types.
*/
public final int nalUnitLengthFieldLength;
@Nullable private final TrackEncryptionBox[] sampleDescriptionEncryptionBoxes;
public Track(int id, int type, long timescale, long movieTimescale, long durationUs,
Format format, @Transformation int sampleTransformation,
@Nullable TrackEncryptionBox[] sampleDescriptionEncryptionBoxes, int nalUnitLengthFieldLength,
@Nullable long[] editListDurations, @Nullable long[] editListMediaTimes) {
this.id = id;
this.type = type;
this.timescale = timescale;
this.movieTimescale = movieTimescale;
this.durationUs = durationUs;
this.format = format;
this.sampleTransformation = sampleTransformation;
this.sampleDescriptionEncryptionBoxes = sampleDescriptionEncryptionBoxes;
this.nalUnitLengthFieldLength = nalUnitLengthFieldLength;
this.editListDurations = editListDurations;
this.editListMediaTimes = editListMediaTimes;
}
/**
* Returns the {@link TrackEncryptionBox} for the given sample description index.
*
* @param sampleDescriptionIndex The given sample description index
* @return The {@link TrackEncryptionBox} for the given sample description index. Maybe null if no
* such entry exists.
*/
@Nullable
public TrackEncryptionBox getSampleDescriptionEncryptionBox(int sampleDescriptionIndex) {
return sampleDescriptionEncryptionBoxes == null ? null
: sampleDescriptionEncryptionBoxes[sampleDescriptionIndex];
}
// incompatible types in argument.
@SuppressWarnings("nullness:argument.type.incompatible")
public Track copyWithFormat(Format format) {
return new Track(
id,
type,
timescale,
movieTimescale,
durationUs,
format,
sampleTransformation,
sampleDescriptionEncryptionBoxes,
nalUnitLengthFieldLength,
editListDurations,
editListMediaTimes);
}
}
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