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Add TrackSelectionUtil.getAverageBitrate method
------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=218877191
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eguven
Oliver Woodman
parent
9ea678c5e6
commit
ed32e2a7f7
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/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.exoplayer2.trackselection;
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import com.google.android.exoplayer2.C;
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import com.google.android.exoplayer2.source.chunk.MediaChunkIterator;
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/** Track selection related utility methods. */
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public final class TrackSelectionUtil {
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private TrackSelectionUtil() {}
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/**
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* Returns average bitrate for chunks in bits per second. Chunks are included in average until
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* {@code maxDurationMs} or the first unknown length chunk.
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*
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* @param iterator Iterator for media chunk sequences.
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* @param maxDurationUs Maximum duration of chunks to be included in average bitrate, in
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* microseconds.
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* @return Average bitrate for chunks in bits per second, or {@link C#LENGTH_UNSET} if there are
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* no chunks or the first chunk length is unknown.
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*/
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public static int getAverageBitrate(MediaChunkIterator iterator, long maxDurationUs) {
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long totalDurationUs = 0;
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long totalLength = 0;
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while (iterator.next()) {
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long chunkLength = iterator.getDataSpec().length;
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if (chunkLength == C.LENGTH_UNSET) {
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break;
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}
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long chunkDurationUs = iterator.getChunkEndTimeUs() - iterator.getChunkStartTimeUs();
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if (totalDurationUs + chunkDurationUs >= maxDurationUs) {
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totalLength += chunkLength * (maxDurationUs - totalDurationUs) / chunkDurationUs;
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totalDurationUs = maxDurationUs;
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break;
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}
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totalDurationUs += chunkDurationUs;
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totalLength += chunkLength;
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}
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return totalDurationUs == 0
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? C.LENGTH_UNSET
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: (int) (totalLength * C.BITS_PER_BYTE * C.MICROS_PER_SECOND / totalDurationUs);
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}
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}
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/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.exoplayer2.trackselection;
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import static com.google.common.truth.Truth.assertThat;
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import android.net.Uri;
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import com.google.android.exoplayer2.C;
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import com.google.android.exoplayer2.source.chunk.BaseMediaChunkIterator;
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import com.google.android.exoplayer2.source.chunk.MediaChunkIterator;
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import com.google.android.exoplayer2.upstream.DataSpec;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.robolectric.RobolectricTestRunner;
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/** {@link TrackSelectionUtil} tests. */
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@RunWith(RobolectricTestRunner.class)
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public class TrackSelectionUtilTest {
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public static final long MAX_DURATION_US = 30 * C.MICROS_PER_SECOND;
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@Test
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public void getAverageBitrate_emptyIterator_returnsUnsetLength() {
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assertThat(TrackSelectionUtil.getAverageBitrate(MediaChunkIterator.EMPTY, MAX_DURATION_US))
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.isEqualTo(C.LENGTH_UNSET);
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}
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@Test
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public void getAverageBitrate_oneChunk_returnsChunkBitrate() {
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long[] chunkTimeBoundariesSec = {0, 5};
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long[] chunkLengths = {10};
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FakeIterator iterator = new FakeIterator(chunkTimeBoundariesSec, chunkLengths);
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int expectedAverageBitrate =
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(int) (chunkLengths[0] * C.BITS_PER_BYTE / chunkTimeBoundariesSec[1]);
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assertThat(TrackSelectionUtil.getAverageBitrate(iterator, MAX_DURATION_US))
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.isEqualTo(expectedAverageBitrate);
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}
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@Test
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public void getAverageBitrate_multipleSameDurationChunks_returnsAverageChunkBitrate() {
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long[] chunkTimeBoundariesSec = {0, 5, 10};
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long[] chunkLengths = {10, 20};
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FakeIterator iterator = new FakeIterator(chunkTimeBoundariesSec, chunkLengths);
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long totalLength = chunkLengths[0] + chunkLengths[1];
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int expectedAverageBitrate = (int) (totalLength * C.BITS_PER_BYTE / chunkTimeBoundariesSec[2]);
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assertThat(TrackSelectionUtil.getAverageBitrate(iterator, MAX_DURATION_US))
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.isEqualTo(expectedAverageBitrate);
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}
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@Test
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public void getAverageBitrate_multipleDifferentDurationChunks_returnsAverageChunkBitrate() {
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long[] chunkTimeBoundariesSec = {0, 5, 15, 30};
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long[] chunkLengths = {10, 20, 30};
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FakeIterator iterator = new FakeIterator(chunkTimeBoundariesSec, chunkLengths);
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long totalLength = chunkLengths[0] + chunkLengths[1] + chunkLengths[2];
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int expectedAverageBitrate = (int) (totalLength * C.BITS_PER_BYTE / chunkTimeBoundariesSec[3]);
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assertThat(TrackSelectionUtil.getAverageBitrate(iterator, MAX_DURATION_US))
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.isEqualTo(expectedAverageBitrate);
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}
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@Test
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public void getAverageBitrate_firstChunkLengthUnset_returnsUnsetLength() {
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long[] chunkTimeBoundariesSec = {0, 5, 15, 30};
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long[] chunkLengths = {C.LENGTH_UNSET, 20, 30};
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FakeIterator iterator = new FakeIterator(chunkTimeBoundariesSec, chunkLengths);
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assertThat(TrackSelectionUtil.getAverageBitrate(iterator, MAX_DURATION_US))
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.isEqualTo(C.LENGTH_UNSET);
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}
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@Test
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public void getAverageBitrate_secondChunkLengthUnset_returnsFirstChunkBitrate() {
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long[] chunkTimeBoundariesSec = {0, 5, 15, 30};
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long[] chunkLengths = {10, C.LENGTH_UNSET, 30};
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FakeIterator iterator = new FakeIterator(chunkTimeBoundariesSec, chunkLengths);
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int expectedAverageBitrate =
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(int) (chunkLengths[0] * C.BITS_PER_BYTE / chunkTimeBoundariesSec[1]);
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assertThat(TrackSelectionUtil.getAverageBitrate(iterator, MAX_DURATION_US))
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.isEqualTo(expectedAverageBitrate);
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}
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@Test
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public void
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getAverageBitrate_chunksExceedingMaxDuration_returnsAverageChunkBitrateUpToMaxDuration() {
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long[] chunkTimeBoundariesSec = {0, 5, 15, 45, 50};
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long[] chunkLengths = {10, 20, 30, 100};
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FakeIterator iterator = new FakeIterator(chunkTimeBoundariesSec, chunkLengths);
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// Just half of the third chunk is in the max duration
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long totalLength = chunkLengths[0] + chunkLengths[1] + chunkLengths[2] / 2;
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int expectedAverageBitrate =
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(int) (totalLength * C.BITS_PER_BYTE * C.MICROS_PER_SECOND / MAX_DURATION_US);
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assertThat(TrackSelectionUtil.getAverageBitrate(iterator, MAX_DURATION_US))
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.isEqualTo(expectedAverageBitrate);
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}
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@Test
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public void getAverageBitrate_zeroMaxDuration_returnsUnsetLength() {
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long[] chunkTimeBoundariesSec = {0, 5, 10};
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long[] chunkLengths = {10, 20};
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FakeIterator iterator = new FakeIterator(chunkTimeBoundariesSec, chunkLengths);
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assertThat(TrackSelectionUtil.getAverageBitrate(iterator, /* maxDurationUs= */ 0))
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.isEqualTo(C.LENGTH_UNSET);
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}
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private static final class FakeIterator extends BaseMediaChunkIterator {
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private final long[] chunkTimeBoundariesSec;
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private final long[] chunkLengths;
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public FakeIterator(long[] chunkTimeBoundariesSec, long[] chunkLengths) {
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super(/* fromIndex= */ 0, /* toIndex= */ chunkTimeBoundariesSec.length - 2);
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this.chunkTimeBoundariesSec = chunkTimeBoundariesSec;
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this.chunkLengths = chunkLengths;
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}
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@Override
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public DataSpec getDataSpec() {
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checkInBounds();
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return new DataSpec(
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Uri.EMPTY,
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/* absoluteStreamPosition= */ 0,
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chunkLengths[(int) getCurrentIndex()],
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/* key= */ null);
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}
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@Override
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public long getChunkStartTimeUs() {
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checkInBounds();
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return chunkTimeBoundariesSec[(int) getCurrentIndex()] * C.MICROS_PER_SECOND;
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}
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@Override
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public long getChunkEndTimeUs() {
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checkInBounds();
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return chunkTimeBoundariesSec[(int) getCurrentIndex() + 1] * C.MICROS_PER_SECOND;
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}
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}
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}
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