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Refactor track specific logic in Mp4MoovStructure

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PiperOrigin-RevId: 530878135
This commit is contained in:
sheenachhabra 2023-05-10 12:06:01 +00:00 committed by Tofunmi Adigun-Hameed
parent ecaf219d74
commit 97b65bcf67
1 changed files with 43 additions and 20 deletions
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63
libraries/muxer/src/main/java/androidx/media3/muxer/Mp4MoovStructure.java
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@ -19,6 +19,7 @@ import static androidx.media3.muxer.Mp4Utils.MVHD_TIMEBASE;
import static java.lang.Math.max;
import android.media.MediaCodec.BufferInfo;
import androidx.media3.common.C;
import androidx.media3.common.Format;
import androidx.media3.common.MimeTypes;
import androidx.media3.common.util.Util;
@ -71,9 +72,6 @@ import org.checkerframework.checker.nullness.qual.PolyNull;
Format format = track.format();
String languageCode = bcp47LanguageTagToIso3(format.language);
boolean isVideo = MimeTypes.isVideo(format.sampleMimeType);
boolean isAudio = MimeTypes.isAudio(format.sampleMimeType);
// Generate the sample durations to calculate the total duration for tkhd box.
List<Long> sampleDurationsVu =
Boxes.durationsVuForStts(
@ -90,21 +88,52 @@ import org.checkerframework.checker.nullness.qual.PolyNull;
long trackDurationUs =
Mp4Utils.usFromVu(trackDurationInTrackUnitsVu, track.videoUnitTimebase());
String handlerType = isVideo ? "vide" : (isAudio ? "soun" : "meta");
String handlerName = isVideo ? "VideoHandle" : (isAudio ? "SoundHandle" : "MetaHandle");
ByteBuffer stsd =
Boxes.stsd(
isVideo
? Boxes.videoSampleEntry(format)
: (isAudio
? Boxes.audioSampleEntry(format)
: Boxes.textMetaDataSampleEntry(format)));
@C.TrackType int trackType = MimeTypes.getTrackType(format.sampleMimeType);
ByteBuffer stts = Boxes.stts(sampleDurationsVu);
ByteBuffer stsz = Boxes.stsz(track.writtenSamples());
ByteBuffer stsc = Boxes.stsc(track.writtenChunkSampleCounts());
ByteBuffer co64 = Boxes.co64(track.writtenChunkOffsets());
String handlerType;
String handlerName;
ByteBuffer mhdBox;
ByteBuffer sampleEntryBox;
ByteBuffer stsdBox;
ByteBuffer stblBox;
switch (trackType) {
case C.TRACK_TYPE_VIDEO:
handlerType = "vide";
handlerName = "VideoHandle";
mhdBox = Boxes.vmhd();
sampleEntryBox = Boxes.videoSampleEntry(format);
stsdBox = Boxes.stsd(sampleEntryBox);
stblBox =
Boxes.stbl(stsdBox, stts, stsz, stsc, co64, Boxes.stss(track.writtenSamples()));
break;
case C.TRACK_TYPE_AUDIO:
handlerType = "soun";
handlerName = "SoundHandle";
mhdBox = Boxes.smhd();
sampleEntryBox = Boxes.audioSampleEntry(format);
stsdBox = Boxes.stsd(sampleEntryBox);
stblBox = Boxes.stbl(stsdBox, stts, stsz, stsc, co64);
break;
case C.TRACK_TYPE_METADATA:
// TODO: (b/280443593) - Check if we can identify a metadata track type from a custom
// mime type.
case C.TRACK_TYPE_UNKNOWN:
handlerType = "meta";
handlerName = "MetaHandle";
mhdBox = Boxes.nmhd();
sampleEntryBox = Boxes.textMetaDataSampleEntry(format);
stsdBox = Boxes.stsd(sampleEntryBox);
stblBox = Boxes.stbl(stsdBox, stts, stsz, stsc, co64);
break;
default:
throw new IllegalArgumentException("Unsupported track type");
}
// The below statement is also a description of how a mdat box looks like, with all the
// inner boxes and what they actually store. Although they're technically instance methods,
// everything that is written to a box is visible in the argument list.
@ -125,13 +154,7 @@ import org.checkerframework.checker.nullness.qual.PolyNull;
metadataCollector.modificationDateUnixMs,
languageCode),
Boxes.hdlr(handlerType, handlerName),
Boxes.minf(
isVideo ? Boxes.vmhd() : (isAudio ? Boxes.smhd() : Boxes.nmhd()),
Boxes.dinf(Boxes.dref(Boxes.localUrl())),
isVideo
? Boxes.stbl(
stsd, stts, stsz, stsc, co64, Boxes.stss(track.writtenSamples()))
: Boxes.stbl(stsd, stts, stsz, stsc, co64))));
Boxes.minf(mhdBox, Boxes.dinf(Boxes.dref(Boxes.localUrl())), stblBox)));
trakBoxes.add(trakBox);
videoDurationUs = max(videoDurationUs, trackDurationUs);