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FMP4: Fix output of mixed v0 and v1 emsg samples

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Issue: google/ExoPlayer#9996
#minor-release
PiperOrigin-RevId: 430773329
(cherry picked from commit 5a304fdbd9bc8af8229b1a9cddc79f359fe8e215)
This commit is contained in:
olly 2022-02-24 20:59:58 +00:00 committed by Ian Baker
parent 7125a3361b
commit d10700456d
1 changed files with 35 additions and 13 deletions
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48
libraries/extractor/src/main/java/androidx/media3/extractor/mp4/FragmentedMp4Extractor.java
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@ -666,14 +666,23 @@ public class FragmentedMp4Extractor implements Extractor {
emsgTrackOutput.sampleData(encodedEventMessage, sampleSize); emsgTrackOutput.sampleData(encodedEventMessage, sampleSize);
} }
// Output the sample metadata. This is made a little complicated because emsg-v0 atoms // Output the sample metadata.
// have presentation time *delta* while v1 atoms have absolute presentation time.
if (sampleTimeUs == C.TIME_UNSET) { if (sampleTimeUs == C.TIME_UNSET) {
// We need the first sample timestamp in the segment before we can output the metadata. // We're processing a v0 emsg atom, which contains a presentation time delta, and cannot yet
// calculate its absolute sample timestamp. Defer outputting the metadata until we can.
pendingMetadataSampleInfos.addLast( pendingMetadataSampleInfos.addLast(
new MetadataSampleInfo(presentationTimeDeltaUs, sampleSize)); new MetadataSampleInfo(
presentationTimeDeltaUs, /* sampleTimeIsRelative= */ true, sampleSize));
pendingMetadataSampleBytes += sampleSize;
} else if (!pendingMetadataSampleInfos.isEmpty()) {
// We also need to defer outputting metadata if pendingMetadataSampleInfos is non-empty, else
// we will output metadata for samples in the wrong order. See:
// https://github.com/google/ExoPlayer/issues/9996.
pendingMetadataSampleInfos.addLast(
new MetadataSampleInfo(sampleTimeUs, /* sampleTimeIsRelative= */ false, sampleSize));
pendingMetadataSampleBytes += sampleSize; pendingMetadataSampleBytes += sampleSize;
} else { } else {
// We can output the sample metadata immediately.
if (timestampAdjuster != null) { if (timestampAdjuster != null) {
sampleTimeUs = timestampAdjuster.adjustSampleTimestamp(sampleTimeUs); sampleTimeUs = timestampAdjuster.adjustSampleTimestamp(sampleTimeUs);
} }
@ -1459,19 +1468,30 @@ public class FragmentedMp4Extractor implements Extractor {
return true; return true;
} }
/**
* Called immediately after outputting a non-metadata sample, to output any pending metadata
* samples.
*
* @param sampleTimeUs The timestamp of the non-metadata sample that was just output.
*/
private void outputPendingMetadataSamples(long sampleTimeUs) { private void outputPendingMetadataSamples(long sampleTimeUs) {
while (!pendingMetadataSampleInfos.isEmpty()) { while (!pendingMetadataSampleInfos.isEmpty()) {
MetadataSampleInfo sampleInfo = pendingMetadataSampleInfos.removeFirst(); MetadataSampleInfo metadataSampleInfo = pendingMetadataSampleInfos.removeFirst();
pendingMetadataSampleBytes -= sampleInfo.size; pendingMetadataSampleBytes -= metadataSampleInfo.size;
long metadataTimeUs = sampleTimeUs + sampleInfo.presentationTimeDeltaUs; long metadataSampleTimeUs = metadataSampleInfo.sampleTimeUs;
if (metadataSampleInfo.sampleTimeIsRelative) {
// The metadata sample timestamp is relative to the timestamp of the non-metadata sample
// that was just output. Make it absolute.
metadataSampleTimeUs += sampleTimeUs;
}
if (timestampAdjuster != null) { if (timestampAdjuster != null) {
metadataTimeUs = timestampAdjuster.adjustSampleTimestamp(metadataTimeUs); metadataSampleTimeUs = timestampAdjuster.adjustSampleTimestamp(metadataSampleTimeUs);
} }
for (TrackOutput emsgTrackOutput : emsgTrackOutputs) { for (TrackOutput emsgTrackOutput : emsgTrackOutputs) {
emsgTrackOutput.sampleMetadata( emsgTrackOutput.sampleMetadata(
metadataTimeUs, metadataSampleTimeUs,
C.BUFFER_FLAG_KEY_FRAME, C.BUFFER_FLAG_KEY_FRAME,
sampleInfo.size, metadataSampleInfo.size,
pendingMetadataSampleBytes, pendingMetadataSampleBytes,
null); null);
} }
@ -1577,11 +1597,13 @@ public class FragmentedMp4Extractor implements Extractor {
/** Holds data corresponding to a metadata sample. */ /** Holds data corresponding to a metadata sample. */
private static final class MetadataSampleInfo { private static final class MetadataSampleInfo {
public final long presentationTimeDeltaUs; public final long sampleTimeUs;
public final boolean sampleTimeIsRelative;
public final int size; public final int size;
public MetadataSampleInfo(long presentationTimeDeltaUs, int size) { public MetadataSampleInfo(long sampleTimeUs, boolean sampleTimeIsRelative, int size) {
this.presentationTimeDeltaUs = presentationTimeDeltaUs; this.sampleTimeUs = sampleTimeUs;
this.sampleTimeIsRelative = sampleTimeIsRelative;
this.size = size; this.size = size;
} }
} }