Virtually zero increase in compression efficiency compared to 4:2:0 with empty
chroma planes. Performance is better though, especially with fast settings.
Fixes some thread safety doubts and makes code cleaner.
Downside: slightly higher memory usage when calling multiple encoders from the same application.
Add 'i_bitdepth' to x264_param_t with the corresponding '--output-depth' CLI
option to set the bit depth at runtime.
Drop the 'x264_bit_depth' global variable. Rather than hardcoding it to an
incorrect value, it's preferable to induce a linking failure. If applications
relies on this symbol this will make it more obvious where the problem is.
Add Makefile rules that compiles modules with different bit depths. Assembly
on x86 is prefixed with the 'private_prefix' define, while all other archs
modify their function prefix internally.
Templatize the main C library, x86/x86_64 assembly, ARM assembly, AARCH64
assembly, PowerPC assembly, and MIPS assembly.
The depth and cache CLI filters heavily depend on bit depth size, so they
need to be duplicated for each value. This means having to rename these
filters, and adjust the callers to use the right version.
Unfortunately the threaded input CLI module inherits a common.h dependency
(input/frame -> common/threadpool -> common/frame -> common/common) which
is extremely complicated to address in a sensible way. Instead duplicate
the module and select the appropriate one at run time.
Each bitdepth needs different checkasm compilation rules, so split the main
checkasm target into two executables.
Use a dynamic size depending on the MV range. Reduces memory consumption by
up to a few megabytes.
Drop a related old miscompilation check since it may otherwise cause an
out-of-bounds memory access.
Also remove an unused extern variable declaration.
Reorder some elements in the x264_mb_analysis_list_t struct to reduce the
amount of padding required.
Also drop the MMX implementation in favor of SSE.
Drop ALIGNED_N and ALIGNED_ARRAY_N in favor of using explicit alignment.
This will allow us to increase the native alignment without unnecessarily
increasing the alignment of everything that's currently 32-byte aligned.
Makes the printf() family functions on MinGW use the correct C99 POSIX
versions instead of the broken pre-VS2015 Microsoft ones.
Also allows us to get rid of some _GNU_SOURCE and _ISOC99_SOURCE defines.
Furthermore, the x264_analyse_prepare_costs() and x264_analyse_init_costs()
functions were only used in x264_encoder_open(), so move that entire section
of code to analyse.c as well to simplify things.
This format has been reverse engineered and x264's output has almost exactly
the same bitstream as Panasonic cameras and encoders produce. It therefore does
not comply with SMPTE RP2027 since Panasonic themselves do not comply with
their own specification. It has been tested in Avid, Premiere, Edius and
Quantel.
Parts of this patch were written by Fiona Glaser and some reverse
engineering was done by Joseph Artsimovich.
Branchlessly handle elimination of candidates in MMX roundclip asm.
Add a new asm function, similar to roundclip, except without the round part.
Optimize and organize the C code, and make both subme>=3 and subme<3 consistent.
Add lots of explanatory comments and try to make things a little more understandable.
~5-10% faster with subme>=3, ~15-20% faster with subme<3.
Ziemowit Zabawa