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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 org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
/**
* Sample table for a track in an MP4 file.
*/
/* package */ final class TrackSampleTable {
/** The track corresponding to this sample table. */
public final Track track;
/** Number of samples. */
public final int sampleCount;
/** Sample offsets in bytes. */
public final long[] offsets;
/** Sample sizes in bytes. */
public final int[] sizes;
/** Maximum sample size in {@link #sizes}. */
public final int maximumSize;
/** Sample timestamps in microseconds. */
public final long[] timestampsUs;
/** Sample flags. */
public final int[] flags;
/**
* The duration of the track sample table in microseconds, or {@link C#TIME_UNSET} if the sample
* table is empty.
*/
public final long durationUs;
public TrackSampleTable(
Track track,
long[] offsets,
int[] sizes,
int maximumSize,
long[] timestampsUs,
int[] flags,
long durationUs) {
Assertions.checkArgument(sizes.length == timestampsUs.length);
Assertions.checkArgument(offsets.length == timestampsUs.length);
Assertions.checkArgument(flags.length == timestampsUs.length);
this.track = track;
this.offsets = offsets;
this.sizes = sizes;
this.maximumSize = maximumSize;
this.timestampsUs = timestampsUs;
this.flags = flags;
this.durationUs = durationUs;
sampleCount = offsets.length;
if (flags.length > 0) {
flags[flags.length - 1] |= C.BUFFER_FLAG_LAST_SAMPLE;
}
}
/**
* Returns the sample index of the closest synchronization sample at or before the given
* timestamp, if one is available.
*
* @param timeUs Timestamp adjacent to which to find a synchronization sample.
* @return Index of the synchronization sample, or {@link C#INDEX_UNSET} if none.
*/
public int getIndexOfEarlierOrEqualSynchronizationSample(long timeUs) {
// Video frame timestamps may not be sorted, so the behavior of this call can be undefined.
// Frames are not reordered past synchronization samples so this works in practice.
int startIndex = Util.binarySearchFloor(timestampsUs, timeUs, true, false);
for (int i = startIndex; i >= 0; i--) {
if ((flags[i] & C.BUFFER_FLAG_KEY_FRAME) != 0) {
return i;
}
}
return C.INDEX_UNSET;
}
/**
* Returns the sample index of the closest synchronization sample at or after the given timestamp,
* if one is available.
*
* @param timeUs Timestamp adjacent to which to find a synchronization sample.
* @return index Index of the synchronization sample, or {@link C#INDEX_UNSET} if none.
*/
public int getIndexOfLaterOrEqualSynchronizationSample(long timeUs) {
int startIndex = Util.binarySearchCeil(timestampsUs, timeUs, true, false);
for (int i = startIndex; i < timestampsUs.length; i++) {
if ((flags[i] & C.BUFFER_FLAG_KEY_FRAME) != 0) {
return i;
}
}
return C.INDEX_UNSET;
}
}
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