When converting NAL units from AnnexB to Avcc format,
one byte at a time was read. In fact many bytes were read
multiple times due to suboptimal logic.
Changed the logic to read 4 bytes at once and also to avoid
reading same bytes again.
This improved the time taken for writing a batch of 30
samples from 40ms to 20ms.
PiperOrigin-RevId: 673025781
In the current implementation due to missing "="
operator, last three bytes were not checked for
000 or 001 sequence.
In sample_no_bframes file, few samples has extra 0 at the end.
It was working fine with the bug because muxer was writing some
harmless 0 at the end.
PiperOrigin-RevId: 672994054
This interface was used by Boxes.moov. This CL removes the interface and just uses the Track object directly.
Since Track is package-private it seems fine to use it directly.
The drawback with interface is that, with every new field addition in the
Track class, we need to update the interface as well (if we need to access that field for moov box).
PiperOrigin-RevId: 669295399
The CL aims to
1. Shorten unnecessary lengthy chatty comments.
2. Remove dead TODOs.
3. nit fixes for comment style consistency.
4. Remove usage of "we" in the comments.
5. Media3 muxer does not need to mention the behaviour of framework muxer
unless its required for some purpose, so remove them.
PiperOrigin-RevId: 668985875
The CL adds another way of writing editable video
tracks where the samples will be interleaved with the
primary track samples in the "mdat" box.
PiperOrigin-RevId: 665313751
The parameter class will allow addition of more
parameters (link shouldInterleaveSamples), which are specific to
editable video file format.
PiperOrigin-RevId: 662923844
The TrackToken is primarily for public API.
Using Track object internally will remove unnecessary
type casting at various places.
PiperOrigin-RevId: 662564224
There are two ways to write editable tracks samples.
1. In the embedded edit data MP4.
2. Interleaved with primary tracks samples.
Initial plan was to support only option 1 but then the
decision is to support both ways. To identify between these two
an additional key will be required.
Option 2 is yet to be implemented in Mp4Muxer.
PiperOrigin-RevId: 658791214
Creating a moov box is same as creating any other box so
there is no particular need to have a separate class for this.
In a follow up CL the method will be moved into Boxes.java along with
other box creation methods.
Made nit changes in the final fields ordering to match with
constructor parameter ordering.
PiperOrigin-RevId: 653602558
Boxes.moov() simply wraps the subboxes and this logic can be
put into main method which has all the logic of creating moov box.
This is to eventually move Mp4MoovStucture.moov() into
Boxes.java where all other box creation methods are already present.
PiperOrigin-RevId: 653319292
All other AndroidX libraries have already increased their min SDK to
21.
This change renames private symbols to remove `V21` suffixes and
similar, but doesn't change public or protected symbols with similar
names, to avoid needless breakages/churn on users of the library.
Some of the dead code removal is more complex, so I've split it out
into follow-up changes to make it easier to review.
PiperOrigin-RevId: 651776556
Add support for MPEG4 codec to enable muxing video encoded with the mp4v-es codec. Use esdsBox method to generate esds box required for Mp4v box.
PiperOrigin-RevId: 651000744
Some external media files have CodecSpecificData greater than 128 bytes. Currently, that size
isn't fitting in one byte. Hence, added support to store large CodecSpecificDataSize, as per
ISO standard, by extending to more than one byte as required.
PiperOrigin-RevId: 650972472
Since the muxer supported only AAC audio codec, the esdsBox was unconditionally created within the audioSampleEntry. This CL refactors the box creation logic by moving it to the codecSpecificBox method. This is to make adding support for new audio codecs easier.
PiperOrigin-RevId: 650130935
Add the following NAL unit parsing utility functions that will be needed for the MV-HEVC support as proposed in Apple's HEVC stereo video interoperability profile:
- NAL unit header parsing to get the layer information needed for MV-HEVC support.
- VPS parsing, including vps_extension() needed for MV-HEVC support.
- SPS parsing modifications to support MV-HEVC.
PiperOrigin-RevId: 647329211
This is done by reserving some space for moov box at the start of the file and writing it there if it fits. If it doesn't fit, then it is written at the end of the file.
PiperOrigin-RevId: 643944698
