2010-05-18 11:58:33 -04:00
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/*
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2010-09-09 08:16:39 -04:00
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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2010-05-18 11:58:33 -04:00
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*
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2010-06-18 12:39:21 -04:00
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* Use of this source code is governed by a BSD-style license
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2010-06-04 16:19:40 -04:00
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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2010-06-18 12:39:21 -04:00
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* in the file PATENTS. All contributing project authors may
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2010-06-04 16:19:40 -04:00
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* be found in the AUTHORS file in the root of the source tree.
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2010-05-18 11:58:33 -04:00
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*/
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#ifndef __INC_DCT_H
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#define __INC_DCT_H
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#define prototype_fdct(sym) void (sym)(short *input, short *output, int pitch)
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#if ARCH_X86 || ARCH_X86_64
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#include "x86/dct_x86.h"
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#endif
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#if ARCH_ARM
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#include "arm/dct_arm.h"
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#endif
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2012-02-28 17:11:12 -08:00
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2012-06-25 12:26:09 -07:00
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#if CONFIG_HYBRIDTRANSFORM
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void vp8_fht4x4_c(short *input, short *output, int pitch, TX_TYPE tx_type);
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void vp8_fht8x4_c(short *input, short *output, int pitch, TX_TYPE tx_type);
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#endif
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2011-02-14 14:18:18 -08:00
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#ifndef vp8_fdct_short8x8
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#define vp8_fdct_short8x8 vp8_short_fdct8x8_c
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#endif
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extern prototype_fdct(vp8_fdct_short8x8);
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#ifndef vp8_fhaar_short2x2
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#define vp8_fhaar_short2x2 vp8_short_fhaar2x2_c
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#endif
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extern prototype_fdct(vp8_fhaar_short2x2);
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2010-05-18 11:58:33 -04:00
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#ifndef vp8_fdct_short4x4
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#define vp8_fdct_short4x4 vp8_short_fdct4x4_c
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#endif
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extern prototype_fdct(vp8_fdct_short4x4);
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#ifndef vp8_fdct_short8x4
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#define vp8_fdct_short8x4 vp8_short_fdct8x4_c
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#endif
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extern prototype_fdct(vp8_fdct_short8x4);
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2010-07-07 10:26:30 -07:00
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// There is no fast4x4 (for now)
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#ifndef vp8_fdct_fast4x4
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#define vp8_fdct_fast4x4 vp8_short_fdct4x4_c
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#endif
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#ifndef vp8_fdct_fast8x4
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#define vp8_fdct_fast8x4 vp8_short_fdct8x4_c
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#endif
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2010-05-18 11:58:33 -04:00
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#ifndef vp8_fdct_walsh_short4x4
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#define vp8_fdct_walsh_short4x4 vp8_short_walsh4x4_c
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#endif
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extern prototype_fdct(vp8_fdct_walsh_short4x4);
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Add lossless compression mode.
This commit adds lossless compression capability to the experimental
branch. The lossless experiment can be enabled using --enable-lossless
in configure. When the experiment is enabled, the encoder will use
lossless compression mode by command line option --lossless, and the
decoder automatically recognizes a losslessly encoded clip and decodes
accordingly.
To achieve the lossless coding, this commit has changed the following:
1. To encode at lossless mode, encoder forces the use of unit
quantizer, i.e, Q 0, where effective quantization is 1. Encoder also
disables the usage of 8x8 transform and allows only 4x4 transform;
2. At Q 0, the first order 4x4 DCT/IDCT have been switched over
to a pair of forward and inverse Walsh-Hadamard Transform
(http://goo.gl/EIsfy), with proper scaling applied to match the range
of the original 4x4 DCT/IDCT pair;
3. At Q 0, the second order remains to use the previous
walsh-hadamard transform pair. However, to maintain the reversibility
in second order transform at Q 0, scaling down is applied to first
order DC coefficients prior to forward transform, and scaling up is
applied to the second order output prior to quantization. Symmetric
upscaling and downscaling are added around inverse second order
transform;
4. At lossless mode, encoder also disables a number of minor
features to ensure no loss is introduced, these features includes:
a. Trellis quantization optimization
b. Loop filtering
c. Aggressive zero-binning, rounding and zero-bin boosting
d. Mode based zero-bin boosting
Lossless coding test was performed on all clips within the derf set,
to verify that the commit has achieved lossless compression for all
clips. The average compression ratio is around 2.57 to 1.
(http://goo.gl/dEShs)
Change-Id: Ia3aba7dd09df40dd590f93b9aba134defbc64e34
2012-06-13 19:03:31 -07:00
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#if CONFIG_LOSSLESS
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extern prototype_fdct(vp8_short_walsh4x4_x8_c);
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extern prototype_fdct(vp8_short_walsh8x4_x8_c);
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extern prototype_fdct(vp8_short_walsh4x4_lossless_c);
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#endif
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2010-05-18 11:58:33 -04:00
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typedef prototype_fdct(*vp8_fdct_fn_t);
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2012-07-13 15:21:29 -07:00
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typedef struct {
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vp8_fdct_fn_t short8x8;
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vp8_fdct_fn_t haar_short2x2;
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vp8_fdct_fn_t short4x4;
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vp8_fdct_fn_t short8x4;
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vp8_fdct_fn_t fast4x4;
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vp8_fdct_fn_t fast8x4;
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vp8_fdct_fn_t walsh_short4x4;
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2010-05-18 11:58:33 -04:00
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} vp8_fdct_rtcd_vtable_t;
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#if CONFIG_RUNTIME_CPU_DETECT
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#define FDCT_INVOKE(ctx,fn) (ctx)->fn
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#else
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#define FDCT_INVOKE(ctx,fn) vp8_fdct_##fn
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#endif
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#endif
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