MediaMuxer: Create FullBox for APV

APV box extends ISOBMFF `FullBox`. `FullBox` has extra 32 bits of
data containing flag and version. Thus, added 4 byte data in apvC
box creation.

Bug: 392976813
Bug: 392976819
Test: atest MediaMuxerTest
Change-Id: I703e3e7b6e5515bd777a227c8ca11f4a1ff48ba7

parent 2e264b11

media/libstagefright/MPEG4Writer.cpp

+3 −0

Original line number	Diff line number	Diff line
		@@ -5128,6 +5128,9 @@ void MPEG4Writer::Track::writeApvcBox() {
		CHECK_GE(mCodecSpecificDataSize, 4u);

		mOwner->beginBox("apvC");
		// apvC extends FullBox and hence the need to write first
		// 4 bytes here when compared with av1C which extends Box.
		mOwner->writeInt32(0); // version=0, flags=0
		mOwner->write(mCodecSpecificData, mCodecSpecificDataSize);
		mOwner->endBox(); // apvC
		}