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Revert logic to decide whether meta atom is full

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The previous logic was changed under the assumption that the first box
inside a meta box was not always an hdlr box, but this is not true.

#minor-release

PiperOrigin-RevId: 357200713
This commit is contained in:
kimvde 2021-02-12 16:58:14 +00:00 committed by Oliver Woodman
parent 086d8f3a8e
commit c1ef00ab42
2 changed files with 12 additions and 10 deletions
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18
library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/AtomParsers.java
View File

@ -231,20 +231,22 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
* <p>Atoms of type {@link Atom#TYPE_meta} are defined to be full atoms which have four additional
* bytes for a version and a flags field (see 4.2 'Object Structure' in ISO/IEC 14496-12:2005).
* QuickTime do not have such a full box structure. Since some of these files are encoded wrongly,
* we can't rely on the file type though. Instead we must check the 4 bytes after the common
* we can't rely on the file type though. Instead we must check the 8 bytes after the common
* header bytes ourselves.
*
* @param meta The 4 or more bytes following the meta atom size and type.
* @param meta The 8 or more bytes following the meta atom size and type.
*/
public static void maybeSkipRemainingMetaAtomHeaderBytes(ParsableByteArray meta) {
int startPosition = meta.getPosition();
// The next 4 bytes can be either:
// (iso) 4 zero bytes (version + flags)
// (qt) 4 byte size of next atom
int endPosition = meta.getPosition();
// The next 8 bytes can be either:
// (iso) [1 byte version + 3 bytes flags][4 byte size of next atom]
// (qt) [4 byte size of next atom ][4 byte hdlr atom type ]
// In case of (iso) we need to skip the next 4 bytes.
if (meta.readInt() != 0) {
meta.setPosition(startPosition);
meta.skipBytes(4);
if (meta.readInt() != Atom.TYPE_hdlr) {
endPosition += 4;
}
meta.setPosition(endPosition);
}
/**

4
library/extractor/src/main/java/com/google/android/exoplayer2/extractor/mp4/Mp4Extractor.java
View File

@ -728,8 +728,8 @@ public final class Mp4Extractor implements Extractor, SeekMap {
}
private void maybeSkipRemainingMetaAtomHeaderBytes(ExtractorInput input) throws IOException {
scratch.reset(4);
input.peekFully(scratch.getData(), 0, 4);
scratch.reset(8);
input.peekFully(scratch.getData(), 0, 8);
AtomParsers.maybeSkipRemainingMetaAtomHeaderBytes(scratch);
input.skipFully(scratch.getPosition());
input.resetPeekPosition();