configure:  --enable-experimental --enable-scalability

New applications:  scalable_encoder, scalable_decoder

scalable_encoder:
  * Encodes inputs as 2-layer (same size) stream
  * Encodes as obu file (OBU_NO_IVF must be enabled)
  * Base layer encoded in IPPPP where P's reference
    only the previous (in time) base layer
  * Enhancement layer encoded using its base layer as
    sole reference frame
  * Base layer encoded with fixed high QP
  * Enhancement layer encoded with fixed low QP

scalable_decoder:
  * Able to decode scalable stream generated by
    scalable_encoder
  * Able to decode any single-layer stream encoded
    by aomenc
  * Outputs base layer as out_lyr0.yuv, and enhancement
    layer (if they exist) as out_lyrN.yuv (N = 1, 2, 3, ..)
  * Able to decode N layers (more than 2)

Change-Id: I8555735db71e5b9b6f900ffdf978e0ad6f6bfc00

Change-Id: I2d2ce75c184011884de8a015a6666b5209de2082

Encoder: Prior to this patch, some chroma data was calculated and
later discarded when in monochrome mode. This patch ensures that
the chroma planes are left uninitialised and that chroma
calculations are not performed.

Decoder: Prior to this patch, some chroma calculations were still
being performed in monochrome mode (e.g. loop filtering). This
patch ensures that calculations are only performed on the y
plane, with the chroma planes being set to a constant.

Change-Id: I394c0c9fc50f884e76a65e6131bd6598b8b21b10

Change-Id: If47ac212044a977b12c8df1322759d173dd29ed5

Change-Id: I69e07309b708caa59c313ae2156828d8c089cf4d

Removed compressed header related code that is not used anymore.

Change-Id: I8e4881ecf9a4e0a25bd59a456eab9815d4bdd418

Change-Id: I6cd366d929d689217f292db07cbeaf1fd35c2055

This patch made several changes.
1. Removed writing large_scale_tile bit to bitstream.
2. Created SET_TILE_MODE API in decoder to pass in tile coding mode
information.
3. Modified related unit tests.

BUG=aomedia:1204

Change-Id: I2d729afba8b1b9278543a5da154be7ae6c99d184

BUG=aomedia:1233

Change-Id: Ib740ee063b87003cf8c6cbd8f2ae4b917892e41c

Change-Id: I0156df138342be1f4ffa867a5e293887ff83e251

In the decoder, the function get_tx_size_context() is called
by read_selected_tx_size(), *before* mbmi->ref_frame is set up.
This means that mbmi->ref_frame still holds the ref frames from
the previous block, and does not indicate if the current block is
inter or not.

Fortunately, all of the other functions called by read_selected_tx_size()
have an explicit "is_inter" parameter, which is set correctly.
So we can just plumb this through into get_tx_size_context().

Change-Id: I00f0f3704937f592ccc5d304ed20ee25196dd520

BUG=aomedia:1230

Change-Id: I8a66b6303752b77a09cca1fe6890137146c50d1e

Change-Id: Ic68c6e8d54782f47fe9d1d1775b861edeb52bf35

This is to exclude coding CFL for block sizes where it is normatively
not allowed.

Reuse the alternate CDFs from the --disable-cfl path.

This yields some improvement on subset1:
   PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
-0.0113 | -0.2630 | -0.2138 |   0.0021 | -0.0110 | -0.0157 |    -0.0511

BUG=aomedia:1182

Change-Id: I1e5f23ef7f2debcf8edce788bfa63ec95db4a679

Change-Id: I0d76adba7c5ea387a9c58076369d1eba89b0fbfe

BUG=aomedia:1215

Change-Id: Idc2d732e2574b61b5970d3fe9aa3723790a2be36

When the coding block size is above 64x64, process the YUV planes
in each 64x64 block unit.

BUG=aomedia:1055

Change-Id: If66f67514cc5de4a6cff94c9f74e335c241c8c9b

This experiment has been adopted, we can simplify the code
by dropping the associated preprocessor conditionals.

Change-Id: Ia2100f102de6d9d5a67ba7178a20a50202839636

Was forgotten when commited.
Happened only when temporal prediction was on.

Change-Id: I08c3f03f3442d0b0c6c9aa0bb2a3943dcdb303ab

Make the intra mode transform block coding operation processed in
64x64 unit.

BUG=aomedia:1055

Change-Id: I7cf0f38ce7afc87febfc6b26fd663e6a3392537c

The loop restoration parameters were previously written
at the end of each superblock, and have now been moved
to the beginning.

Change-Id: I45fc57a82d0ee340e6281f0a70d42ec0829caf9c

Replace av1_foreach_transformed_block_in_plane() function call
with partition based transform block indexing. This allows one to
make 64x64 based YUV plane coding.

BUG=aomedia:1055

Change-Id: I3a01c61697116eaa649f029808ca6b49067b540f

Change-Id: I03c6cf0b58f9e1d74c7d30d76e846be9a640dab7

Designs the sequence header syntax to support various
profiles as decided in the AV1 codec WG:

Profile 0: 4:2:0 and 4:0:0 8/10-bit
Profile 1: 4:4:4 8/10-bit
Profile 2: 4:2:0/4:0:0/4:4:4 12-bit as well as 4:2:2 8/10/12-bit

Change-Id: Iea351698280e37d65847bf75a43c5bbeba8f7cf4

dq_type now takes 4 possible values, one of which is
the original multiply-only dequantizer.

Change-Id: I2180f632f0d7f91dc391a6e802a93a77de789228

Change-Id: I0f0cdf479091c308594a0288a0546dbdb76e4450

Change-Id: I66a542da0c7b8fdb9ac2d4efee73aa62414c10f9

Change-Id: I9c013f1c7bd1ae5adf58ac884f884ea0c59a382c

Change-Id: Iede0e0eaccfd4c4751a35056efeba0c7578c3dac

Change-Id: Ic803d86bae707e9728f819d4c7098f8971facbc4

This experiment has been adopted, we can simplify the code
by dropping the associated preprocessor conditionals.

Change-Id: I09423f67995ea4bea6f1de71bfeef7f6f1c2ae19

At this point, av1_adapt_intra_frame_probs() can be removed.

Change-Id: I7e9f97e8e782b88c10e108230e5d12309460c477

Properly handle the tile load size writing operations in ext-tile
when large-scale-tile is on and off. This fixes an enc/dec mismatch
issue when both ext-tile and obu are turned on.

BUG=aomedia:1179

Change-Id: I460e0cd55ba5d0bf5b75b5a5f6866c8774693207

Fix the broken unit test when ext-tile and obu are both turned on.
The test failure was due to the merge of CONFIG_ADD_4BYTES_OBUSIZE.
This solves the unit test failure cases when cm->large_scale_tile
is on.

BUG=aomedia:1179

Change-Id: I7b4a5720e493db2a7d914fc9f8b886a67b1e85cd

Change-Id: I2fbf8f0b44c48719e597a98c118ec38b3347071a

- Make the add_4bytes_obusize experiment part of the obu experiment.
- Remove the add_4bytes_obusize experiment flags.
- Update the encoder, decoder, and tooling sources.

BUG=aomedia:1125

Change-Id: Ia5c443c855e52618257b39c44ca2632703bf83fd

Part2 of ext-warped-motion experiment was removed.

Change-Id: I1b7aebad1fd7cb60d92c3ce959d5101228addae2

Bakes in DISABLE_VARTX_FOR_CHROMA/DISABLE_SMLTX_FOR_CHROMA_INTRA
macros.
Cleans up code and removes the unwieldy uv_txsize_lookup array.

Change-Id: I9aec8bfcfe218791517ab18e427bc645687916c3

Change-Id: I70ebb6ada7ec4a975a8984a2e1ea2fa51664a786

Encoder now writes the binary symbol for show_existing_frame to
indicate the value of reset_decoder_state. The default value now
is set as zero regardless. This enables the bitstream match with
the decoder.

With this patch when fwd-kf is enabled, one additional bit is
signaled at the frame header for show_existing_frame, but without
any coding performance impact.

Change-Id: Ib0137e6a513011c0ac9506837d32e9ad405508af