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Boxes: Update STTS duration calculation.

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Update the function convertPresentationTimestampsToDurationsVu
to return a list of duration in decoding order,used in the
creation of STTS boxes.

PiperOrigin-RevId: 627052898
This commit is contained in:
Googler 2024-04-22 08:56:19 -07:00 committed by Copybara-Service
parent 03a041c452
commit 430fafded6
2 changed files with 34 additions and 2 deletions
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20
libraries/muxer/src/main/java/androidx/media3/muxer/Boxes.java
View File

@ -629,15 +629,31 @@ import java.util.Locale;
long firstSamplePresentationTimeUs,
int videoUnitTimescale,
@Mp4Muxer.LastFrameDurationBehavior int lastDurationBehavior) {
List<Long> presentationTimestampsUs = new ArrayList<>(samplesInfo.size());
List<Long> durationsVu = new ArrayList<>(samplesInfo.size());
if (samplesInfo.isEmpty()) {
return durationsVu;
}
boolean hasBframe = false;
long lastSamplePresentationTimeUs = 0L;
for (int sampleId = 0; sampleId < samplesInfo.size(); sampleId++) {
long currentSamplePresentationTimeUs = samplesInfo.get(sampleId).presentationTimeUs;
presentationTimestampsUs.add(currentSamplePresentationTimeUs);
if (currentSamplePresentationTimeUs < lastSamplePresentationTimeUs) {
hasBframe = true;
}
lastSamplePresentationTimeUs = currentSamplePresentationTimeUs;
}
if (hasBframe) {
Collections.sort(presentationTimestampsUs);
}
long currentSampleTimeUs = firstSamplePresentationTimeUs;
for (int nextSampleId = 1; nextSampleId < samplesInfo.size(); nextSampleId++) {
long nextSampleTimeUs = samplesInfo.get(nextSampleId).presentationTimeUs;
for (int nextSampleId = 1; nextSampleId < presentationTimestampsUs.size(); nextSampleId++) {
long nextSampleTimeUs = presentationTimestampsUs.get(nextSampleId);
// TODO: b/316158030 - First calculate the duration and then convert us to vu to avoid
// rounding error.
long currentSampleDurationVu =

16
libraries/muxer/src/test/java/androidx/media3/muxer/BoxesTest.java
View File

@ -461,6 +461,22 @@ public class BoxesTest {
assertThat(durationsVu).containsExactly(3_000L, 5_000L, 5_000L);
}
@Test
public void
convertPresentationTimestampsToDurationsVu_withOutOfOrderSampleTimestamps_returnsExpectedDurations() {
List<MediaCodec.BufferInfo> sampleBufferInfos =
createBufferInfoListWithSamplePresentationTimestamps(0L, 10_000L, 1_000L, 2_000L, 11_000L);
List<Long> durationsVu =
Boxes.convertPresentationTimestampsToDurationsVu(
sampleBufferInfos,
/* firstSamplePresentationTimeUs= */ 0L,
VU_TIMEBASE,
LAST_FRAME_DURATION_BEHAVIOR_INSERT_SHORT_FRAME);
assertThat(durationsVu).containsExactly(100L, 100L, 800L, 100L, 0L);
}
@Test
public void createSttsBox_withSingleSampleDuration_matchesExpected() throws IOException {
ImmutableList<Long> sampleDurations = ImmutableList.of(500L);