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Add limited support for edit lists in fragmented MP4s.

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Currently only supports a single offset to the full media timeline
(indicated by a duration of 0). This is most often used to fix the
non-zero starting presentation timestamp introduced when B-frames
are present.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=111816916
This commit is contained in:
rileya 2016-01-10 18:56:50 -08:00 committed by Oliver Woodman
parent aec9657c76
commit c6cdf7e083
1 changed files with 16 additions and 3 deletions
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19
library/src/main/java/com/google/android/exoplayer/extractor/mp4/FragmentedMp4Extractor.java
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@ -530,6 +530,17 @@ public final class FragmentedMp4Extractor implements Extractor {
boolean sampleCompositionTimeOffsetsPresent =
(flags & 0x800 /* sample_composition_time_offsets_present */) != 0;
// Offset to the entire video timeline. In the presence of B-frames this is usually used to
// ensure that the first frame's presentation timestamp is zero.
long edtsOffset = 0;
// Currently we only support a single edit that moves the entire media timeline (indicated by
// duration == 0). Other uses of edit lists are uncommon and unsupported.
if (track.editListDurations != null && track.editListDurations.length == 1
&& track.editListDurations[0] == 0) {
edtsOffset = Util.scaleLargeTimestamp(track.editListMediaTimes[0], 1000, track.timescale);
}
out.initTables(sampleCount);
int[] sampleSizeTable = out.sampleSizeTable;
int[] sampleCompositionTimeOffsetTable = out.sampleCompositionTimeOffsetTable;
@ -558,7 +569,8 @@ public final class FragmentedMp4Extractor implements Extractor {
} else {
sampleCompositionTimeOffsetTable[i] = 0;
}
sampleDecodingTimeTable[i] = Util.scaleLargeTimestamp(cumulativeTime, 1000, timescale);
sampleDecodingTimeTable[i] =
Util.scaleLargeTimestamp(cumulativeTime, 1000, timescale) - edtsOffset;
sampleSizeTable[i] = sampleSize;
sampleIsSyncFrameTable[i] = ((sampleFlags >> 16) & 0x1) == 0
&& (!workaroundEveryVideoFrameIsSyncFrame || i == 0);
@ -802,14 +814,15 @@ public final class FragmentedMp4Extractor implements Extractor {
|| atom == Atom.TYPE_sidx || atom == Atom.TYPE_stsd || atom == Atom.TYPE_tfdt
|| atom == Atom.TYPE_tfhd || atom == Atom.TYPE_tkhd || atom == Atom.TYPE_trex
|| atom == Atom.TYPE_trun || atom == Atom.TYPE_pssh || atom == Atom.TYPE_saiz
|| atom == Atom.TYPE_saio || atom == Atom.TYPE_senc || atom == Atom.TYPE_uuid;
|| atom == Atom.TYPE_saio || atom == Atom.TYPE_senc || atom == Atom.TYPE_uuid
|| atom == Atom.TYPE_elst;
}
/** Returns whether the extractor should parse a container atom with type {@code atom}. */
private static boolean shouldParseContainerAtom(int atom) {
return atom == Atom.TYPE_moov || atom == Atom.TYPE_trak || atom == Atom.TYPE_mdia
|| atom == Atom.TYPE_minf || atom == Atom.TYPE_stbl || atom == Atom.TYPE_moof
|| atom == Atom.TYPE_traf || atom == Atom.TYPE_mvex;
|| atom == Atom.TYPE_traf || atom == Atom.TYPE_mvex || atom == Atom.TYPE_edts;
}
}