Commit graph

5 commits

Author SHA1 Message Date
Zaggy1024
b10da81c7c LibVideo: Fast-path converting colors by only matrix coefficients
We don't need to run through the whole floating-point color converter
for videos that use sRGB transfer characteristics and BT.709 color
primaries. This commit adds a new templated inlining function to
ColorConverter to do a very fast fixed-point YCbCr to RGB conversion.

With the fast path, frame conversion times go from ~7.8ms down to
~3.7ms. The fast path can benefit a lot more from extra SIMD vector
width, as well.
2023-04-25 17:44:36 -04:00
Zaggy1024
7a58577fee LibVideo: Convert subsampled frames in a vectorization-friendly way
This change reduces the time spent converting frames for display in
a 1080p video from ~19ms per frame to ~12ms per frame.
2023-04-25 17:44:36 -04:00
Linus Groh
9c08bb9555 AK: Remove try_ prefix from FixedArray creation functions 2023-01-28 22:41:36 +01:00
Ben Wiederhake
6fd478b6ce Everywhere: Remove unused includes of AK/Format.h
These instances were detected by searching for files that include
AK/Format.h, but don't match the regex:

\\b(CheckedFormatString|critical_dmesgln|dbgln|dbgln_if|dmesgln|FormatBu
ilder|__FormatIfSupported|FormatIfSupported|FormatParser|FormatString|Fo
rmattable|Formatter|__format_value|HasFormatter|max_format_arguments|out
|outln|set_debug_enabled|StandardFormatter|TypeErasedFormatParams|TypeEr
asedParameter|VariadicFormatParams|v_critical_dmesgln|vdbgln|vdmesgln|vf
ormat|vout|warn|warnln|warnln_if)\\b

(Without the linebreaks.)

This regex is pessimistic, so there might be more files that don't
actually use any formatting functions.

Observe that this revealed that Userland/Libraries/LibC/signal.cpp is
missing an include.

In theory, one might use LibCPP to detect things like this
automatically, but let's do this one step after another.
2023-01-02 20:27:20 -05:00
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