We have renamed following Macros to avoid name confusion:
REFS_PER_FRAME --> INTER_REFS_PER_FRAME
(= ALTREF_FRAME - LAST_FRAME + 1)
MAX_REF_FRAMES --> TOTAL_REFS_PER_FRAME
(= ALTREF_FRAME - INTRA_FRAME + 1)
INTER_REFS_PER_FRAME specifies the maximum number of reference frames
that each Inter frame may use.
TOTAL_REFS_PER_FRAME is equal to INTER_REFS_PER_FRAME + 1, which
counts the INTRA_FRAME.
Further, at the encoder side, since REF_FRAMES specifies the maximum
number of the reference frames that the encoder may store, REF_FRAMES
is usually larger than INTER_REFS_PER_FRAME. For example, in the
ext-refs experiment, REF_FRAMES == 8, which allows the encoder to
store maximum 8 reference frames in the buffer, but
INTER_REFS_PER_FRAME equals to 6, which allows each Inter frame may
use up to 6 frames out of the 8 buffered frames as its references.
Hence, in order to explore the possibility to store more reference
frames in future patches, we modified a couple of array sizes to
accomodate the case that the number of buffered reference frames is
not always equal to the number of the references that are being used
by each Inter frame.
Change-Id: I19e42ef608946cc76ebfd3e965a05f4b9b93a0b3
Originally we need to send the refresh flag and the virtual indices
mapping for the reference frame buffer update for show_existing_frame to
have the BWDREF_FRAME replace the LAST_FRAME.
To remove sending this information, we update the the virtual indices
of the reference frame buffer after the last_bipred_frame is encoded,
and therefore the decoder will receive the updated reference mapping
at the next non-show-existing frame.
As a result, we can save 4 bytes per show-existing frame, and get 0.12,
0.2, and 0.07 BDRATE improvement in lowres, derf, and midref test set
respectively.
Change-Id: I63d41ee6ea99884798f0778b789d2701e2f2d3e0
This patch removed the experiment of BIDIR_PRED and merged the feature
into the experiment of EXT_REFS:
(1) Each frame now has up to 6 reference frames, namely
LAST_FRAME, LAST2_FRAME, LAST3_FRAME, GOLDEN_FRAME, (forward) and
BWDREF_FRAME, ALTREF_FRAME (backward);
LAST4_FRAME has been removed;
(2) First pass still keeps the 8 updates:
KF_UPDATE, LF_UPDATE, GF_UPDATE, ARF_UPDATE, OVERLAY_UPDATE, and
BRF_UPDATE, LAST_BIPRED_UPDATE, BI_PRED_UPDATE;
(3) show_existing_frame==1 is supported in the experiment of EXT_REFS;
(4) New encoding modes are added for both single-ref and compound cases,
through the use of the 2 extra forward references (LAST2 & LAST3)
and the 1 extra backward reference (BWDREF).
RD performance wise, using Overall PSNR: Avg/BDRate
Bipred only Prev EXT_REFS Current EXT_REFS with bipred
lowres: -3.474/-3.324 -1.748/-1.586 -4.613/-4.387
derflr: -2.097/-1.353 -1.439/-1.215 -3.120/-2.252
midres: -2.129/-1.901 -1.345/-1.185 -2.898/-2.636
If in vp10/encoder/firstpass.h, change BFG_INTERVAL from 2 to 3, i.e. to
use 2 bi-predictive frames than 1, a further improvement may be
obtained:
Current EXT_REFS with bipred
1 bi-predictive frame 2 bi-predictive frames
lowres: -4.613/-4.387 -4.675/-4.465
derflr: -3.120/-2.252 -3.333/-2.516
midres: -2.898/-2.636 -3.406/-3.095
Change-Id: Ib06fe9ea0a5cfd7418a1d79b978ee9d80bf191cb
Major parts have been implemented as follows:
(1) Added BRF_UPDATE, LASTNRF_UPDATE, and NRF_UPDATE in firstpass.c;
(2) Added the handling for the scenario of
"cpi->common.show_existing_frame == 1" at the encoder;
(3) Added a new reference frame of BWDREF_FRAME;
(4) Have bwd-ref work with upsampled references.
Note that when the experiment of "ext_refs" turned on, this experiment
will be turned off automatically currently.
RD performance in Overall PSNR has been improved, compared against the
VP10 baseline:
lowres: Avg -3.312; BDRate -3.154
derflr: Avg -1.927; BDRate -1.176
midres: Avg -2.149; BDRate -2.001
hdres : Avg -0.567; BDRate -0.588
Change-Id: I4c06ff51cc20194bffbd4d2346e57ba3dcf6b62c
This patch always compares the most recent show frames between
the encoder and the decoder to test the mismatch.
Change-Id: I68a91ad0996a598231450debfd616e24992419b5
This will facilitate bringing the zero node into the token set while
allowing its probability to vary independently.
Change-Id: I57b44c0fce44debb8e612021e44713b229d1b3cf
Moved the API patch from NextGen to NextGenv2 and also added this
API to VP10. An example was included. To try it, for example, run
the following command:
$ examples/vpx_cx_set_ref vp10 352 288 in.yuv out.ivf 4 30
Change-Id: Ib56bc3d365e530cfc8d859a13ddbf4c007907b81
After porting tile coding from VP9 to VP10, some performance
degradation was seen because of the difference between VP9 and
Vp10 baseline. This patch disabled some features in VP10 while
tile coding is turned on. Also, an encoder control API was added
back for this use case.
Change-Id: I8f736db8388408a8cc35320a2f80abb02906571c
Make the RANS implementation operate on cumulative distribution
functions rather than individual probability distribution functions.
CDFs have shown themselves more flexible to work with.
Reduces decoding memory usage from scaling O(num_distributions *
symbol_resolution) to O(num_distributions).
No bitstream change. This is an purely implementation change.
Change-Id: I4e18d3a0a3d37a36a61487c3d778f9d088b0b374
This commit unifies the encoder and decoder border extension and
motion compensated prediction process. Remove the decoder specific
flow to simplify the development flow.
Change-Id: I9c43bbe6d7c017e6da2db6a62c5bf3d0af7ccfce
There were a number of compiler warnings:
1. int16_t to uint8_t in recon_intra.c;
2. double to float conversions in psnrhvs.c
3. intptr_t to int in quantize.c
4. size_t to int32_t in decoder.c
Change-Id: Id95423b17779dcfa6cf39d9a90fe8cb8b910f5df
Under the experiment of EXT_REFS: LAST2_FRAME, LAST3_FRAME, and
LAST4_FRAME.
Coding efficiency: derflr +1.601%; hevchr +1.895%
Speed: Encoder slowed down by ~75%
Change-Id: Ifeee5f049c2c1f7cb29bc897622ef88897082ecf
Remove MISC_FIXES flags except for the changes on MV precision, which
has a 0.1% performance drop.
On derflr, the impact is -0.012%.
Change-Id: I0a74e5a212dd0cb827192a318c92a714c9681e45
This is identical to what the tile size does for the last tile. See
issue 1042 (which covers generalizing the superframe/tile concepts).
Change-Id: I1f187d2e3b984e424e3b6d79201b8723069e1a50
