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11 Commits

Author SHA1 Message Date
skal
1667bded67 Remove ReadOneBit() and ReadSymbolUnsafe() 
Simplify and re-organize the VP8L bit-reader functions
(e.g.: the 40-bit look-ahead code was helping much)

Speed-up with LBITS=64, on arm7-a:

=> before:
./dwebp_justify_24_neon -v bryce_ll.webp
Time to decode picture: 11.393s
File bryce_ll.webp can be decoded (dimensions: 11158 x 2156).
...

=> after (LBITS=64):	Time to decode picture: 9.953s

making the VP8L bit-reader in 32 bit mode is going to be
harder (because we need to be able to read two symbols
at a time, each with max length 15 bits)

Change-Id: I89746fb103b87b5e2fd40a3208a6fbc584b88297
 2013-02-20 00:13:23 +01:00
skal
3383885799 faster decoding (3%-6%) 
. revamped the boolean decoder to use less shifts
. added some description and ASCII art as explanations too.
. clarified the types further (bit_t, lbit_t, range_t, etc.)
. changed the negative field 'missing_' into positive 'bits_'

Some stats, decoding some randomly encoded WebP files:

with USE_RIGHT_JUSTIFY:
  BITS=32 => 133 files, 50 loops => 7.3s (1.097 ms/file/iterations)
  BITS=24 => 133 files, 50 loops => 7.3s (1.097 ms/file/iterations)
  BITS=16 => 133 files, 50 loops => 7.4s (1.120 ms/file/iterations)
  BITS=8 => 133 files, 50 loops => 7.5s (1.128 ms/file/iterations)

without USE_RIGHT_JUSTIFY:
  BITS=32 => 133 files, 50 loops => 7.5s (1.131 ms/file/iterations)
  BITS=24 => 133 files, 50 loops => 7.6s (1.142 ms/file/iterations)
  BITS=16 => 133 files, 50 loops => 7.6s (1.143 ms/file/iterations)
  BITS=8 => 133 files, 50 loops => 7.6s (1.149 ms/file/iterations)

Change-Id: I9277fb051676c05582e9c7ea3cb5a4b2a3ffb12e
 2013-02-14 15:42:58 +01:00
Pascal Massimino
6920c71f0a fix MSVC warnings regarding implicit uint64 to uint32 conversions 
Change-Id: I284dae9222a3817bba3c5ba6be271b31b5bf660d
 2012-09-01 07:21:45 -07:00
James Zern
596dff784d VP8LFillBitWindow: use 64-bit path for msvc x64 builds 
Change-Id: I14a3865f4091dd048e02abc99aa4e7f1e325e12a
 2012-07-14 13:20:26 -07:00
Pascal Massimino
48b39eb17a fix underflow for very short bitstreams 
+ hardened the asserts

Change-Id: Ie798ef2f9d848c131f6f84a35ea28ef254822d1e
 2012-07-09 16:47:34 -07:00
Pascal Massimino
fac0f12e1b rename BitReader to VP8LBitReader 
Change-Id: I192b76422e131a94fb58c2c4a5520a5dba807126
 2012-04-13 01:56:31 -07:00
Pascal Massimino
6f01b830e2 split the VP8 and VP8L decoding properly 
* each with their own decoder instances.
* Refactor the incremental buffer-update code a lot.
* remove br_offset_ for VP8LDecoder along the way
* make VP8GetHeaders() be used only for VP8, not VP8L bitstream
* remove VP8LInitDecoder()
* rename VP8LBitReaderResize() to VP8LBitReaderSetBuffer()
(cherry picked from commit 5529a2e6d47212a721ca4ab003215f97bd88ebb4)

Change-Id: I58f0b8abe1ef31c8b0e1a6175d2d86b863793ead
 2012-04-10 23:06:58 -07:00
James Zern
c4ae53c8b3 add utils/bit_reader.[hc] changes from experimental 
Pulled from the parent of the current version (5529a2e^).
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.

Change-Id: I6dae97fc381cd6c1d1640c4c565b2084a41ec955
 2012-04-10 17:48:49 -07:00
Pascal Massimino
01b6380656 4-5% faster decoding, optimized byte loads in arithmetic decoder. 
Bits are loaded 32bits at a time (and often aligned).
Rather 64bit-friendly

Change-Id: If7f67dbe5e37696efbeb6d579d9d8482350b79ee
 2012-01-31 02:07:15 -08:00
James Zern
ad1e163a0d cosmetics: normalize copyright headers 
Change-Id: I5e2462b101e0447a4f15a1455c07131bc97a52dd
 2012-01-06 14:49:06 -08:00
Pascal Massimino
b112e83647 create a libwebputils under src/utils 
with bit_reader bit_writer and thread for now.

Change-Id: If961933fcfc43e60220913fe4d527230ba8f46bb
 2011-09-13 15:34:15 -07:00