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This seeker is only seeking to frames that have already been read by the extractor for playback. Seeking to not-yet-read frames will be implemented in another change. Issue: #6787 PiperOrigin-RevId: 291888899
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library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp3/IndexSeeker.java
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| /* | ||
| * Copyright (C) 2020 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 com.google.android.exoplayer2.extractor.mp3; | ||
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| import com.google.android.exoplayer2.C; | ||
| import com.google.android.exoplayer2.extractor.SeekPoint; | ||
| import com.google.android.exoplayer2.util.LongArray; | ||
| import com.google.android.exoplayer2.util.Util; | ||
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| /** MP3 seeker that builds a time-to-byte mapping as the stream is read. */ | ||
| /* package */ final class IndexSeeker implements Seeker { | ||
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| private static final long MIN_TIME_BETWEEN_POINTS_US = C.MICROS_PER_SECOND / 10; | ||
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| private final long durationUs; | ||
| private final long dataEndPosition; | ||
| private final LongArray timesUs; | ||
| private final LongArray positions; | ||
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| public IndexSeeker(long durationUs, long dataStartPosition, long dataEndPosition) { | ||
| this.durationUs = durationUs; | ||
| this.dataEndPosition = dataEndPosition; | ||
| timesUs = new LongArray(); | ||
| positions = new LongArray(); | ||
| timesUs.add(0L); | ||
| positions.add(dataStartPosition); | ||
| } | ||
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| @Override | ||
| public long getTimeUs(long position) { | ||
| int targetIndex = | ||
| Util.binarySearchFloor( | ||
| positions, position, /* inclusive= */ true, /* stayInBounds= */ true); | ||
| return timesUs.get(targetIndex); | ||
| } | ||
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| @Override | ||
| public long getDataEndPosition() { | ||
| return dataEndPosition; | ||
| } | ||
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| @Override | ||
| public boolean isSeekable() { | ||
| return true; | ||
| } | ||
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| @Override | ||
| public long getDurationUs() { | ||
| return durationUs; | ||
| } | ||
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| @Override | ||
| public SeekPoints getSeekPoints(long timeUs) { | ||
| int targetIndex = | ||
| Util.binarySearchFloor(timesUs, timeUs, /* inclusive= */ true, /* stayInBounds= */ true); | ||
| SeekPoint seekPoint = new SeekPoint(timesUs.get(targetIndex), positions.get(targetIndex)); | ||
| if (seekPoint.timeUs >= timeUs || targetIndex == timesUs.size() - 1) { | ||
| return new SeekPoints(seekPoint); | ||
| } else { | ||
| SeekPoint nextSeekPoint = | ||
| new SeekPoint(timesUs.get(targetIndex + 1), positions.get(targetIndex + 1)); | ||
| return new SeekPoints(seekPoint, nextSeekPoint); | ||
| } | ||
| } | ||
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| /** | ||
| * Adds a seek point to the index if it is sufficiently distant from the other points. | ||
| * | ||
| * <p>Seek points must be added in order. | ||
| * | ||
| * @param timeUs The time corresponding to the seek point to add in microseconds. | ||
| * @param position The position corresponding to the seek point to add in bytes. | ||
| */ | ||
| public void maybeAddSeekPoint(long timeUs, long position) { | ||
| long lastTimeUs = timesUs.get(timesUs.size() - 1); | ||
| if (timeUs - lastTimeUs < MIN_TIME_BETWEEN_POINTS_US) { | ||
| return; | ||
| } | ||
| timesUs.add(timeUs); | ||
| positions.add(position); | ||
| } | ||
| } |
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