Codec45 is used in some RA2 videos on top of codec37.
It consists of 2 tables (768 and 32768 bytes), and datapackets
like codec2 (delta-x, delta-y) with a pixel counter instead of a color value.
It then reads the 4 surrounding pixels, looks up 3 separate values
for each in table1, adds them together to form an index into
table2 for a new pixel value, in a row.
The data coming in gets the x/y coordinates out of the visible
area very quickly (2-3 iterations); I don't see any visual
difference between the ffmpeg-produced frames and ones captured
with dosbox from rebel assault 2, which leads me to believe this
codec never worked as intended.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Handle STOR/FTCH the same way the RA1 game engine does:
On STOR, save the next following FOBJ (not the decoded image)
in a buffer; decode it on FTCH.
The RA1 codecs and the fobj handler now take an explicit
GetByteContext in order to be able to replay stored data.
Used extensively by Rebel Assault 1 for e.g. backgrounds and
the cockpit overlay.
For ANIMv2 keep the current system to store the decoded image, as
replaying a FOBJ would not work with codecs37/47/48 due to sequence
violations.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Compression 4 code 0 means copy from delta buffer without mv,
AND start of a skip run. This gets rid of the extra case and column
index manipulation and implements this as it is implemented in the
original game exe, i.e. as a special case for after mv copy.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
This codec works on 4x4 pixel tiles, which can be generated and read
from the datastream. They're both identical, codec5 misses a tile
index to skip the current tile.
Codecs33/34 are the same as 4/5 but with a different tileset generator.
Used only in Rebel Assault 1.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
This codec alternatingly skips and changes existing pixels.
A second 16bit parameter in the FOBJ header indicates how to do
the pixel changes: either by specifying a LUT in the codec datastream
or by adding a constant value to the pixel.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
this codec consists of 4 byte packets: 2bytes delta-x, 1 byte delta-y
and 1 byte color to put at that spot.
Used in Rebel Assault 1 only.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
codec3 is codec1 which writes zero values instead of skipping them.
This fixes a lot of RA1 videos.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
- clear the front buffer with color 0 on the first FOBJ.
Fixes a lot of Rebel Assault 1 videos and Rebel Assault 2 space
scenes (e.g. 08PLAY.SAN which consists only of codec1/2/21 objects
which only ever touch parts of the buffer).
- for ANIMv1 (Rebel Assault 1): set palette index 0 to all zeroes.
This fixes a lot of stray colors in e.g L1HANGAR.ANM, L2INTRO.ANM,
space scenes.
- Esp in RA1, there are a lot of FRME objects which don't contain
any video data (prebuffering some audio only). Account for that.
- In RA1 L2PLAY.ANM there are a few unaligned FOBJs, handle this
in a generic way.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
The size of the video frame (FOBJ) of the old codecs (ANIMv0/1/2) can
very reliably be determined:
- ANIMv0/1 (=Rebel Assault 1) uses a 384x242 internal buffer for
everything. The codec parameters only describe the size and offset
of the specific FOBJ on that buffer.
- ANIMv2 titles usually use one of the fullscreen codecs (37/47/48)
as first FOBJ, and their dimensions can generally be trusted.
- RA2 uses 424x260 as internal buffer, use that if encountered:
08PLAY.SAN does not use codec37 so we need to guess using the
codec coordinates.
- ignore sizes smaller than 2x2 or larger than 800x600.
- some game videos have an initial fobj with either 1x1 or -1x-1
pixels in size, ignore them with a warning (Full Throttle
and the Rebel Assault 2 xxRETRY.SAN videos).
Once a known/valid dimension set has been discovered, use it and
don't change it for subsequent FOBJs, rather clamp the large frame
to the determined dimensions.
Tested with RA1, RA2, Full Throttle, Dig, Outlaws, SotE and MotS
videos.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
The left/top parameters of a FOBJ are signed values. Adjust
codec1 code accordingly to not draw outside the buffer area.
Rebel Assault 1 makes heavy use of this.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
The block-based codecs 37/47/48 work on the full frame, and there's no
existing LucasArts game video that uses left/top offsets for these,
as it doesn't make sense. Ignore the left/top parameters for these codecs.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
If h2645data.c were changed in a way that makes it rely on another
object file, all components that need h2645data.o would need to be
updated. And given that the VVC decoder->h2645data.o dependency is
currently hidden in a separate Makefile, it would likely be forgotten.
So move it to the libavcodec/Makefile.
Reviewed-by: Nuo Mi <nuomi2021@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This patch adds a fully-featured level 3 and 4 decoder for FFv1,
supporting Golomb and all Range coding variants, all pixel formats,
and all features, except for the newly added floating-point formats.
On a 6000 Ada, for 3840x2160 bgr0 content at 50Mbps (standard desktop
recording), it is able to do 400fps.
An Alder Lake with 24 threads can barely do 100fps.
This commit adds a reference to the buffer as an argument to
start_frame, and adapts all existing code.
This allows for asynchronous hardware accelerators to skip
copying packet data by referencing it.
This commit adds support for hardware accelerated decoding to
the decoder.
The previous commits already refactored the decoder, this commit
simply adds calls to hooks to decode.
Previously, the callback was only called on init. This makes it
get called on every frame.
We should switch to VK_KHR_video_maintenance2 and provide all params
upfront, but almost nothing supports it yet.
Nothing in this decoder would break if the generic code were to be
changed to allow slice "threading" with only one thread.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Fixes undefined integer overflows. The overflows could always
happen, yet before 4d8b706b1d
it was not undefined because the code implicitly used atomic
types, for which signed integer overflow is defined.
Reported-by: Kacper Michajlow <kasper93@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
If there were not enough data, checksum_size would be read
as zero (due to the implicit checks of the bytestream2 API)
and run into a "data block size invalid" error. Erroring out
earlier via "not enough extradata" is better.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
It makes no sense to try to be exact with max depth
in get_vlc2(): It will mean that the compiler emits code
for all three stages of parsing and runtime checks for
whether max_depth is big enough to parse the next stage
when a not yet complete code has been encountered.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Up until now, decode_block() zeroed every block (of 128 bytes)
before decoding a block; yet this is suboptimal for all modes,
because all modes need to reset all the blocks they use anyway
and so it should be done in one go for all blocks.
For the alpha modes (where blocks need not be coded) all blocks
are zeroed initially anyway, because decode_block() might not
be doing it, so zeroing there again for the coded blocks is
a waste.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
It allows to share them between frame threads.
dc11 can unfortunately not be made static without increasing
LOCALBUF_ELEMS in vlc.c.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
