Commit Graph

11 Commits

Author SHA1 Message Date
Tim Ledbetter
cb16c217b8 Tests: Add regression tests for fixed OSS-Fuzz test cases 2023-10-24 07:30:04 +02:00
Zaggy1024
b94c132dd1 Tests/LibVideo: Add a test for Matroska files containing CRC32 elements 2023-06-25 20:27:02 -04:00
Zaggy1024
1422f7f904 LibVideo/VP9: Revert framebuffer size reduction to allow OOB blocks
The framebuffer size was reduced in f2c0cee, but this caused some niche
block layouts to write outside of the frame.

This could be fixed by adding checks to see if a block being predicted/
reconstructed is within the frame, but the branches introduced by that
reduce performance slightly. Therefore, it's better to keep the
framebuffer sized according to the decoded frame size in 8x8 blocks so
that any block can be decoded without bounds checking.

A test was added to ensure that this continues to work.
2023-05-02 07:00:46 -04:00
Zaggy1024
dfd0eb877f TestVP9Decode: Dequeue frames from the decoder after sending a sample
Frames must be dequeued from the decoder, or the queue will grow
continuously until OOM.
2023-04-14 07:07:38 -04:00
Zaggy1024
25c9dfbf90 Tests/LibVideo: Test to ensure that VP9 reference vector clamping works
The test file is a short clip from Big Buck Bunny, so a license file
was added to the directory to attribute it.
2023-02-08 18:56:42 +00:00
Zaggy1024
393cfdd5c5 LibVideo: Read Matroska lazily so that large files can start quickly
The Demuxer class was changed to return errors for more functions so
that all of the underlying reading can be done lazily. Other than that,
the demuxer interface is unchanged, and only the underlying reader was
modified.

The MatroskaDocument class is no more, and MatroskaReader's getter
functions replace it. Every MatroskaReader getter beyond the Segment
element's position is parsed lazily from the file as needed. This means
that all getter functions can return DecoderErrors which must be
handled by callers.
2022-11-25 23:28:39 +01:00
Zaggy1024
2dfd236dcd LibVideo: Propagate decoder errors in the Matroska Reader
Matroska::Reader functions now return DecoderErrorOr instead of values
being declared Optional. Useful errors can be handled by the users of
the parser, similarly to the VP9 decoder. A lot of the error checking
in the reader is a lot cleaner thanks to this change, since all reads
can be range checked in Streamer::read_octet() now.

Most functions for the Streamer class are now also out-of-line in
Reader.cpp now instead of residing in the header.
2022-11-25 23:28:39 +01:00
Zaggy1024
9cf7e8c5aa LibVideo: Reorganize demuxer file hierarchy and rename Matroska files
As new demuxers are added, this will get quite full of files, so it'll
be good to have a separate folder for these.

To avoid too many chained namespaces, the Containers subdirectory is
not also a namespace, but the Matroska folder is for the sake of
separating the multiple classes for parsed information entering the
Video namespace.
2022-11-25 23:28:39 +01:00
Zaggy1024
074f771b59 LibVideo: Add VideoFrame class for decoded video frames
The class is virtual and has one subclass, SubsampledYUVFrame, which
is used by the VP9 decoder to return a single frame. The
output_to_bitmap(Bitmap&) function can be used to set pixels on an
existing bitmap of the correct size to the RGB values that
should be displayed. The to_bitmap() function will allocate a new bitmap
and fill it using output_to_bitmap.

This new class also implements bilinear scaling of the subsampled U and
V planes so that subsampled videos' colors will appear smoother.
2022-10-31 14:47:13 +01:00
Zaggy1024
41cb705b47 LibVideo: Allow the VP9 decoder to decode ultra high resolution video
Previously, some integer overflows and truncations were causing parsing
errors for 4K videos, with those fixed it can fully decode 8K video.

This adds a test to ensure that 4K video will continue to be decoded.

Note: There seems to be unexpectedly high memory usage while decoding
them, causing 8K video to require more than a gigabyte of RAM. (!!!)
2022-10-12 00:54:31 -06:00
Zaggy1024
d67231312e LibVideo: Add test to ensure that a VP9 WebM file will decode
This will test decoding of one second of video, to ensure that it can
fully decode the entire file.
2022-10-09 20:32:40 -06:00