The bit accounting was broken when refactor portions of PVQ to use the
 aom_reader / aom_writer API because the daala_ec calls were using
 OD_ACCOUNTING instead of CONFIG_ACCOUNTING.
This fixes them so that bit accounting will still work with pvq while
 the full port to --enable-accounting is in review.

Change-Id: I99e6b6debc716f1a6780116d5602085f7a2bb827

This commit reworks the transform block partition context update
to support cb4x4 mode in the recursive transform block partition.
It resolves the remaining enc/dec mismatch issue when both cb4x4
and var-tx are turned on.

Change-Id: I850d121204fe4c68e81488f1d2848c570d9d08b9

Fix the 8x4 inverse transform for ADST row process.

Change-Id: Iceff4ab356a51218a952b53b1134606548832eac

Replace hard coded 4x4 transform block step size assumption with
scalable table access.

Change-Id: Ib1cc555c2641e5634acdd91ca33217f00aeb0b89

Enables Wiener based loop restoration only for the UV
frames. The selfguided and domaintranform filters do not
work very well for UV components, hence they are disabled.
For each UV frame a single set of wiener parameters are
sent. They are applied tile-wise, but all tiles use the
same parameters.

BDRATE (Global PSNR) results:
-----------------------------
lowres: -1.266% (up from -0.666%, good improvement)
midres: -1.815% (up from -1.792%, tiny improvement)

Tiling on UV components will be explored subsequently.

Change-Id: Ib5be93121c4e88e05edf3c36c46488df3cfcd1e2

The functions generic_encode() and generic_decode() code the lsb values
 as raw bits using the od_ec_enc_bits() and od_ec_dec_bits() functions.
These code bits in the reverse order as the aom_write_literal() and
 aom_read_literal() functions, so both the encoder and decoder must
 be changed at the same time.
This commit has no impact on metrics but is a bitstream change.

Change-Id: I83546e2d4b73c28a7f269ddc850742df53d227ce

Delete the unused od_laplace_decode(), od_laplace_decode_vector(), and
 laplace_decode_vector_delta() functions.

Change-Id: Iec581e8cdb0bc9cac9199c09486891500c707c03

Change the od_decode_band_pvq_splits() and od_decode_pvq_split()
 functions to take an aom_reader struct instead of an od_ec_dec struct.
Rename od_decode_band_pvq_splits() to aom_decode_band_pvq_splits() and
 od_decode_pvq_split() to aom_decode_pvq_split().

Change-Id: I5979b32977377e1541c609a13242852e5cfab233

Change the od_decode_pvq_codeword() function to take an aom_reader
 struct instead of an od_ec_dec struct.
Rename od_decode_pvq_codeword() to aom_decode_pvq_codeword().

Change-Id: I9fc2dda28a6169cb04410e822070991f3bcbc25a

Change the generic_decode() function to take an aom_reader struct
 instead of an od_ec_dec struct.

Change-Id: Ifa19ab1dbdd9fa1af19e6740839708b27ab4a44b

Change the pvq_decode_partition() function to take an aom_reader struct
 instead of an od_ec_dec struct.

Change-Id: I7247aaa0be3eedd336371ba677dc2d9f16f27d20

Use the generic AOM entropy decoder in the daala_dec_ctx struct.
This is done in preparation for migrating other entropy coder calls to
 use the more generic entropy coding API.

Change-Id: I473a278174195401bcf35730fb5db7eb368b097a

Change-Id: Ied21efe93b2508e052087d84deebaf46c61e9c3d

Change the od_encode_band_pvq_splits() and od_encode_pvq_split()
 functions to take an aom_writer struct instead of an od_ec_enc struct.
Rename od_encode_band_pvq_splits() to aom_encode_band_pvq_splits() and
 od_encode_pvq_split() to aom_encode_pvq_split().

Change-Id: I72e6684e032f4c8f9f9133c6102f870830001712

Change the od_encode_pvq_codeword() function to take an aom_writer
 struct instead of an od_ec_enc struct.
Rename od_encode_pvq_codeword() to aom_encode_pvq_codeword().

Change-Id: I1254eca06291740770a4371dc01c78c12e613c3a

Change the generic_encode() function to take an aom_writer struct
 instead of an od_ec_enc struct.

Change-Id: Icb447fe5ada27aba45fbaea08b28e9fe42c5a404

Change the pvq_encode_partition() function to take an aom_writer struct
 instead of an od_ec_enc struct.

Change-Id: I459d31c600467958c9a1cbebd632fec05e01f534

Delete the unused od_laplace_encode(), od_laplace_encode_vector(), and
 laplace_encode_vector_delta() functions.

Change-Id: I92e393836c0ba4e5149b2565e7142a161c44c612

Use the generic AOM entropy encoder in the daala_enc_ctx struct.
This is done in preparation for migrating other entropy coder calls to
 use the more generic entropy coding API.

Change-Id: Id627d12402a397bcb21d48d896c0de249d4d8657

Add aom_write_symbol_unscaled() and aom_read_symbol_unscaled() calls
 for encoding and decoding symbols with non-dyadic CDFs, e.g. that
 don't add up to 32768.
This currently only works with the DAALA_EC backend, but does support
 AOM bit accounting.

Change-Id: Icb37500f1b051dd2e8893ff0920302ece1d6ccfd

Change the od_decode_cdf_adapt_q15() function to take an aom_reader
 struct instead of an od_ec_enc struct.
Rename od_decode_cdf_adapt_q15() to aom_decode_cdf_adapt_q15().

Change-Id: I72315c6e89d689e232c53a99a7d4e0f9cdcfbd0c

Change the od_encode_cdf_adapt_q15() function to take an aom_writer
 struct instead of an od_ec_enc struct.
Rename od_encode_cdf_adapt_q15() to aom_encode_cdf_adapt_q15().

Change-Id: I631af7be4b553fbb10a4c72e1958aa48a4c8245a

Change-Id: I79addac857ff10c89f2ad79a5d2bf8d4c5e89ef4

Change-Id: I74d6cd507460d418c7be7faa31394fbcd8bb0d5d

Change-Id: I0cacd4e8cdd07458b36bbdd56e4f005327854b34

Change-Id: Ic0eba16329d7b63dd7d18e9cd28b89be4b5f2710

Change-Id: Ia5046d9158d5421a7f6e0397f4fa1e1925ae2ccb

Change-Id: I1cf27d2f029c1e985cafb468f60e7117d92593f5

Change-Id: I3f7eeff102fc30e2cef59c2c07df94826587d100

Change-Id: I21785bec0563299b4b0c1d17aaaa788e4e8df4d7

Change-Id: I76259d6ec925a0c7024e7c70a517debe2d3bf1ab

* Remove some unused variables
* Reduce need for casts by typing intermediate buffers appropriately
* Avoid copying data which is never modified; use the original data
  instead.
* Reduce number of intermediate buffers required, saving allocations
  of 576KiB in the decoder and ~1MiB in the encoder

No effect on performance

Change-Id: I55243904dd8e818fb6d43fa431903736475d23ff

This CL aims at simplify transform code.

Change-Id: Ibaf1dd8607e37d44a0f77788a72e344583f81fa0

Change-Id: I5ad51375287b40170882c4816d34858be50afacd

This commit enables the cb4x4 mode to support ext-tx experiment. The
coding performance gains are:

       ext-tx   cb4x4    ext-tx + cb4x4
lowres  2.7%     2.6%      4.9%
midres  2.1%     1.2%      3.0%

Change-Id: I6c566b6073527262abcdbb1a0c6bcb8729988f3b

Remove unnecessary #if statements from the implementation.

Change-Id: I09c2f046aec2c43894f8dcfd99216fdf0a50451d

Change-Id: I6ce654b582f2a9d45a40bf22ba597b47d418a0be

Similarly to the refactoring of PVQ codes for 4x4 intra,
instead of calling tx and pvq_encode_helper() in 4x4 inter,
av1_xform_quant() is called.

This commit gives no change in metrics.

Change-Id: Ib69efb00ed5a5b2254478bf5db5a19d9dac12b3b

This commit adds a new experiment to allow disabling of loop filtering
on tile boundaries. It is implemented by adding a syntax field
"loopfilter_across_tiles_enabled" into the uncompressed frame header. 
If it is set to 0, decoder and encoder will disables loop filtering for
block edges that are also tile boundaries.

Change-Id: Ib80bfd82d49c74f1ba46ae18ceedb30704ac8aa5

In 4x4 intra search for RDO, AV1 codes has been changed to
call av1_xform_quant() while ago, while PVQ did not but call
txfm and pvq_encode_helper() instead, which caused duplicated codes
and thus worse maintenance and testing.

This refactor also has fixed the long-sitting bug,
which we couldn't find before refactoring.

PSNR    PSNR-HVS  SSIM  FAST-SSIM  CIEDE 2000 MS-SSIM
-2.77   -2.62     -2.90 -4.07       -2.94     -2.63

Change-Id: I6e526123a64af810897962d11d53028719e82e16