FFmpeg
vc1dsp.h
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1 /*
2  * VC-1 and WMV3 decoder - DSP functions
3  * Copyright (c) 2006 Konstantin Shishkov
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * VC-1 and WMV3 decoder
25  */
26 
27 #ifndef AVCODEC_VC1DSP_H
28 #define AVCODEC_VC1DSP_H
29 
30 #include "hpeldsp.h"
31 #include "h264chroma.h"
32 
33 typedef void (*vc1op_pixels_func)(uint8_t *block/*align width (8 or 16)*/, const uint8_t *pixels/*align 1*/, ptrdiff_t line_size, int h);
34 
35 typedef struct VC1DSPContext {
36  /* vc1 functions */
37  void (*vc1_inv_trans_8x8)(int16_t *b);
38  void (*vc1_inv_trans_8x4)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
39  void (*vc1_inv_trans_4x8)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
40  void (*vc1_inv_trans_4x4)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
41  void (*vc1_inv_trans_8x8_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
42  void (*vc1_inv_trans_8x4_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
43  void (*vc1_inv_trans_4x8_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
44  void (*vc1_inv_trans_4x4_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block);
47  void (*vc1_v_s_overlap)(int16_t *top, int16_t *bottom);
48  void (*vc1_h_s_overlap)(int16_t *left, int16_t *right, int left_stride, int right_stride, int flags);
55 
56  /* put 8x8 block with bicubic interpolation and quarterpel precision
57  * last argument is actually round value instead of height
58  */
61 
62  /* This is really one func used in VC-1 decoding */
65 
66  /* Windows Media Image functions */
67  void (*sprite_h)(uint8_t *dst, const uint8_t *src, int offset, int advance, int count);
68  void (*sprite_v_single)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src1b, int offset, int width);
69  void (*sprite_v_double_noscale)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src2a, int alpha, int width);
70  void (*sprite_v_double_onescale)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src1b, int offset1,
71  const uint8_t *src2a, int alpha, int width);
72  void (*sprite_v_double_twoscale)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src1b, int offset1,
73  const uint8_t *src2a, const uint8_t *src2b, int offset2,
74  int alpha, int width);
75 
76  /**
77  * Search buf from the start for up to size bytes. Return the index
78  * of a zero byte, or >= size if not found. Ideally, use lookahead
79  * to filter out any zero bytes that are known to not be followed by
80  * one or more further zero bytes and a one byte.
81  */
84 
91 
92 #endif /* AVCODEC_VC1DSP_H */
void(* sprite_v_double_onescale)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src1b, int offset1, const uint8_t *src2a, int alpha, int width)
Definition: vc1dsp.h:70
void(* vc1_inv_trans_8x4)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vc1dsp.h:38
void(* vc1_v_loop_filter16)(uint8_t *src, int stride, int pq)
Definition: vc1dsp.h:53
void(* vc1_v_overlap)(uint8_t *src, int stride)
Definition: vc1dsp.h:45
void(* sprite_v_single)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src1b, int offset, int width)
Definition: vc1dsp.h:68
void(* vc1_h_loop_filter16)(uint8_t *src, int stride, int pq)
Definition: vc1dsp.h:54
void(* vc1_h_s_overlap)(int16_t *left, int16_t *right, int left_stride, int right_stride, int flags)
Definition: vc1dsp.h:48
int(* startcode_find_candidate)(const uint8_t *buf, int size)
Search buf from the start for up to size bytes.
Definition: vc1dsp.h:82
#define src
Definition: vp8dsp.c:254
void(* vc1_v_loop_filter4)(uint8_t *src, int stride, int pq)
Definition: vc1dsp.h:49
vc1op_pixels_func put_vc1_mspel_pixels_tab[2][16]
Definition: vc1dsp.h:59
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
void(* vc1_inv_trans_4x8_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vc1dsp.h:43
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
void(* vc1_inv_trans_8x8)(int16_t *b)
Definition: vc1dsp.h:37
void ff_vc1dsp_init_mips(VC1DSPContext *dsp)
ptrdiff_t size
Definition: opengl_enc.c:100
void(* vc1_h_loop_filter8)(uint8_t *src, int stride, int pq)
Definition: vc1dsp.h:52
void(* vc1_inv_trans_4x4)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vc1dsp.h:40
void ff_vc1dsp_init_aarch64(VC1DSPContext *dsp)
void(* h264_chroma_mc_func)(uint8_t *dst, uint8_t *src, ptrdiff_t srcStride, int h, int x, int y)
Definition: h264chroma.h:25
void(* vc1_v_loop_filter8)(uint8_t *src, int stride, int pq)
Definition: vc1dsp.h:51
GLsizei count
Definition: opengl_enc.c:108
#define b
Definition: input.c:41
#define width
void ff_vc1dsp_init_x86(VC1DSPContext *dsp)
Definition: vc1dsp_init.c:105
void(* vc1_h_overlap)(uint8_t *src, int stride)
Definition: vc1dsp.h:46
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
void(* vc1op_pixels_func)(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
Definition: vc1dsp.h:33
void(* vc1_v_s_overlap)(int16_t *top, int16_t *bottom)
Definition: vc1dsp.h:47
void(* vc1_inv_trans_8x8_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vc1dsp.h:41
h264_chroma_mc_func avg_no_rnd_vc1_chroma_pixels_tab[3]
Definition: vc1dsp.h:64
Half-pel DSP functions.
void(* sprite_v_double_noscale)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src2a, int alpha, int width)
Definition: vc1dsp.h:69
static const int16_t alpha[]
Definition: ilbcdata.h:55
void ff_vc1dsp_init_arm(VC1DSPContext *dsp)
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2]...the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so...,+,-,+,-,+,+,-,+,-,+,...hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32-hcoeff[1]-hcoeff[2]-...a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2}an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||.........intra?||||:Block01:yes no||||:Block02:.................||||:Block03::y DC::ref index:||||:Block04::cb DC::motion x:||||.........:cr DC::motion y:||||.................|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------------------------------|||Y subbands||Cb subbands||Cr subbands||||------||------||------|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||------||------||------||||------||------||------|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||------||------||------||||------||------||------|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||------||------||------||||------||------||------|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------------------------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction------------|\Dequantization-------------------\||Reference frames|\IDWT|--------------|Motion\|||Frame 0||Frame 1||Compensation.OBMC v-------|--------------|--------------.\------> Frame n output Frame Frame<----------------------------------/|...|-------------------Range Coder:============Binary Range Coder:-------------------The implemented range coder is an adapted version based upon"Range encoding: an algorithm for removing redundancy from a digitised message."by G.N.N.Martin.The symbols encoded by the Snow range coder are bits(0|1).The associated probabilities are not fix but change depending on the symbol mix seen so far.bit seen|new state---------+-----------------------------------------------0|256-state_transition_table[256-old_state];1|state_transition_table[old_state];state_transition_table={0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:-------------------------FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1.the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:206
void(* vc1_inv_trans_4x8)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vc1dsp.h:39
vc1op_pixels_func avg_vc1_mspel_pixels_tab[2][16]
Definition: vc1dsp.h:60
void * buf
Definition: avisynth_c.h:766
void(* vc1_inv_trans_8x4_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vc1dsp.h:42
void(* sprite_v_double_twoscale)(uint8_t *dst, const uint8_t *src1a, const uint8_t *src1b, int offset1, const uint8_t *src2a, const uint8_t *src2b, int offset2, int alpha, int width)
Definition: vc1dsp.h:72
h264_chroma_mc_func put_no_rnd_vc1_chroma_pixels_tab[3]
Definition: vc1dsp.h:63
void(* vc1_inv_trans_4x4_dc)(uint8_t *dest, ptrdiff_t stride, int16_t *block)
Definition: vc1dsp.h:44
#define flags(name, subs,...)
Definition: cbs_av1.c:561
void ff_vc1dsp_init(VC1DSPContext *c)
Definition: vc1dsp.c:971
int
void ff_vc1dsp_init_ppc(VC1DSPContext *c)
int pixels
Definition: avisynth_c.h:390
void(* vc1_h_loop_filter4)(uint8_t *src, int stride, int pq)
Definition: vc1dsp.h:50
#define stride
void(* sprite_h)(uint8_t *dst, const uint8_t *src, int offset, int advance, int count)
Definition: vc1dsp.h:67