1. Algorithm modification:
Instead of having same filter threshold for a whole frame, now we
allow the thresholds to be adjusted for each macroblock. In current
implementation, to avoid excessive blur on background as reported
in issue480(http://code.google.com/p/webm/issues/detail?id=480), we
reduce the thresholds for skipped macroblocks.
2. SSE2 optimization:
As started in issue479(http://code.google.com/p/webm/issues/detail?id=479),
the filter calculation was adjusted for better performance. The c
code was also modified accordingly. This made the deblock filter
2x faster, and the decoder was 1.2x faster overall.
Next, the demacroblock filter will be modified similarly.
Change-Id: I05e54c3f580ccd427487d085096b3174f2ab7e86
In some situations, believed to be an interaction between temporal
scalability and dropped frames, the references available to an
encoder may not be the same references available to its parent.
Previously, the code tried to force the reference frame chosen by
the parent to be used on this frame, even if it was disabled. This
was preventing the pick mode loop from running even once, which led
to a crash.
Attempts to reproduce this bug locally were unsuccessful, so it is
still undetermined what the underlying cause of this issue is. In
the specific case that was failing, the application did not set
any flags which influenced the reference selection on that frame.
ref_frame_flags indicated that the golden frame was disabled,
believed to be because the last frame updated the last and golden
frames, so golden was shut off by default. It's not clear why this
wouldn't have also been true in the lower res encoder, ie, why the
lower res encoder decided to use and/or was allowed to use the
golden frame. We weren't able to debug into the non-crashing
lower res encoder as the crash couldn't be reproduced locally.
Change-Id: Ifb265253d26963ac2afde0e20cf6792788be6af7
This unit test compares the difference in quality with
error resilience enabled and disabled. The test runs
for all of the one-pass encoding modes.
The test ensures that the effect of turning on error
resilience makes less than a 10% difference in PSNR.
Further cases should be added to do a more comprehensive
test.
Change-Id: I1fc747fc78c9459bc6c74494f4b38308dbed0c32
If a parent mb is available but is intra coded, then parent_ref_mv is
invalid. Check that the parent is inter coded before trying to access
the parent_ref_mv. Previously the parent_ref_mv was being read from
an uninitialized stack allocation, causing potential OOB reads and
other undefined behavior.
Change-Id: I0c93cd412a19c3a184bcf6decaa145b3a036a6c0
Modified EncoderTest class to have separate member variables
for initialization time and per-frame.
Change-Id: I08a1901f8f3ec16e45f96297e08e7f6df0f4aa0b
The stats buffer needs to be reset between runs of the
encoder. I added a Reset() function to TwopassStatsStore
and called it at the beginning of each encode.
This enables us to run multiple encodes which was
previously not possible since there was no way to reset
the stats between runs.
Change-Id: Iebb18dab83ba9331f009f764cc858609738a27f9
Protect the call to {Initialize,Delete}CriticalSection() with an
Interlocked{Inc,Dec}rement() pair, rather than the previous static
initialization. This should play better with AppVerifier, and fix issue
http://code.google.com/p/webm/issues/detail?id=467
Change-Id: I06eadbfac1b3b4414adb8eac862ef9bd14bbe4ad
The codec as it stood placed a keyframe one frame after a
real cut scene - and ignored datarate and other considerations.
TODO: Its possible that we should detect a keyframe and recode
the frame ( in certain circumstances) to improve quality.
Change-Id: Ia1fd6d90103f4da4d21ca5ab62897d22e0b888a8
Reset the cyclie refresh mode index in alloc_compressor_data().
This is needed to handle both cases of internal and
external spatial resizing.
Change-Id: I2697e12d45135eae2e8f0d45161811f24722312a
On an internal spatial resize, this mode index was not reset to 0,
and therefore could exceed dimensions of seg_map or cyclic_refresh_map.
Change-Id: I6fe85dbd2765eb0207a9d9f71fda8d8b8c34f075
Patch Set 1: gain familiarity with unit tests... added simple
4x4 subtract test
Patch Set 2: fixed mistakes, parameterized as suggested
Patch Set 3: randomized the source/predictor data
Change-Id: I33432bdf7c9f2a9b8c2533a37106382c2a8209ee
Signed-off-by: Scott LaVarnway <slavarnway@google.com>
Fixes some build issues for people building for win32 who have a
pthreads emulation layer installed.
Change-Id: I0e0003fa01f65020f6ced35d961dcb1130db37a8
This should avoid problems with blocks gettings high quality
improvement despite having recently moved:
Change-Id: Ic0af0de2d6577807fa3c553f47b55d547ef36359
Set the seg map to 0 for key frame.
In previous commit on cyclic refresh, the seg map for key frame
was not reset, and instead used the seg map from last frame.
Change-Id: I848eb2face420dfcd2f7daca6f070b9127ca938b
-Increase the amount of mbs to be refreshed.
-Replace the delta qp with a fixed and reduced delta.
-Change to the mb update loop to try to always update same amount of mbs.
Change-Id: I93ac88002fd8dc677d2337f77998ff93f64e4ff9
This change is necessary for the frame-based multithreading
implementation.
Since the postproc occurs in this call, vpxdec was modified to time around
vpx_codec_get_frame()
Change-Id: I389acf78b6003cd35e41becc16c893f7d3028523
Initialize the top line at the beginning of each frame and
the left column at the beginning of each row.
Change-Id: I5412f7ea49ffc490215cf65a62715a6c5e3a5a29
Multiple decoders were getting allocated per frame.
If the decoder crashed we exitted with out freeing
them and the next time in we'd allocate over.
This fix removes the allocation and just has 8
boolcoders in the pbi structure
Change-Id: I638b5bda23b622b43b7992aec21dd7cf6f6278da
If the decoder crashes and returned an error before it set up
block offsets but after it set up frame buffers. We had a
problem decoding the next keyframe because the block offsets
were never set.
Change-Id: Ied2866e9770d80fc66241d5e0d978d4f5f9cdd89
