FFmpeg  4.3
faanidct.c
Go to the documentation of this file.
1 /*
2  * Floating point AAN IDCT
3  * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
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 #include "faanidct.h"
22 #include "libavutil/common.h"
23 
24 /* To allow switching to double. */
25 typedef float FLOAT;
26 
27 #define B0 1.0000000000000000000000
28 #define B1 1.3870398453221474618216 // cos(pi*1/16)sqrt(2)
29 #define B2 1.3065629648763765278566 // cos(pi*2/16)sqrt(2)
30 #define B3 1.1758756024193587169745 // cos(pi*3/16)sqrt(2)
31 #define B4 1.0000000000000000000000 // cos(pi*4/16)sqrt(2)
32 #define B5 0.7856949583871021812779 // cos(pi*5/16)sqrt(2)
33 #define B6 0.5411961001461969843997 // cos(pi*6/16)sqrt(2)
34 #define B7 0.2758993792829430123360 // cos(pi*7/16)sqrt(2)
35 
36 #define A4 0.70710678118654752438 // cos(pi*4/16)
37 #define A2 0.92387953251128675613 // cos(pi*2/16)
38 
39 static const FLOAT prescale[64]={
40 B0*B0/8, B0*B1/8, B0*B2/8, B0*B3/8, B0*B4/8, B0*B5/8, B0*B6/8, B0*B7/8,
41 B1*B0/8, B1*B1/8, B1*B2/8, B1*B3/8, B1*B4/8, B1*B5/8, B1*B6/8, B1*B7/8,
42 B2*B0/8, B2*B1/8, B2*B2/8, B2*B3/8, B2*B4/8, B2*B5/8, B2*B6/8, B2*B7/8,
43 B3*B0/8, B3*B1/8, B3*B2/8, B3*B3/8, B3*B4/8, B3*B5/8, B3*B6/8, B3*B7/8,
44 B4*B0/8, B4*B1/8, B4*B2/8, B4*B3/8, B4*B4/8, B4*B5/8, B4*B6/8, B4*B7/8,
45 B5*B0/8, B5*B1/8, B5*B2/8, B5*B3/8, B5*B4/8, B5*B5/8, B5*B6/8, B5*B7/8,
46 B6*B0/8, B6*B1/8, B6*B2/8, B6*B3/8, B6*B4/8, B6*B5/8, B6*B6/8, B6*B7/8,
47 B7*B0/8, B7*B1/8, B7*B2/8, B7*B3/8, B7*B4/8, B7*B5/8, B7*B6/8, B7*B7/8,
48 };
49 
50 static inline void p8idct(int16_t data[64], FLOAT temp[64], uint8_t *dest,
51  ptrdiff_t stride, int x, int y, int type)
52 {
53  int i;
54  FLOAT s04, d04, s17, d17, s26, d26, s53, d53;
55  FLOAT os07, os16, os25, os34;
56  FLOAT od07, od16, od25, od34;
57 
58  for(i=0; i<y*8; i+=y){
59  s17= temp[1*x + i] + temp[7*x + i];
60  d17= temp[1*x + i] - temp[7*x + i];
61  s53= temp[5*x + i] + temp[3*x + i];
62  d53= temp[5*x + i] - temp[3*x + i];
63 
64  od07= s17 + s53;
65  od25= (s17 - s53)*(2*A4);
66 
67  od34= d17*(2*(B6-A2)) - d53*(2*A2);
68  od16= d53*(2*(A2-B2)) + d17*(2*A2);
69 
70  od16 -= od07;
71  od25 -= od16;
72  od34 += od25;
73 
74  s26 = temp[2*x + i] + temp[6*x + i];
75  d26 = temp[2*x + i] - temp[6*x + i];
76  d26*= 2*A4;
77  d26-= s26;
78 
79  s04= temp[0*x + i] + temp[4*x + i];
80  d04= temp[0*x + i] - temp[4*x + i];
81 
82  os07= s04 + s26;
83  os34= s04 - s26;
84  os16= d04 + d26;
85  os25= d04 - d26;
86 
87  if(type==0){
88  temp[0*x + i]= os07 + od07;
89  temp[7*x + i]= os07 - od07;
90  temp[1*x + i]= os16 + od16;
91  temp[6*x + i]= os16 - od16;
92  temp[2*x + i]= os25 + od25;
93  temp[5*x + i]= os25 - od25;
94  temp[3*x + i]= os34 - od34;
95  temp[4*x + i]= os34 + od34;
96  }else if(type==1){
97  data[0*x + i]= lrintf(os07 + od07);
98  data[7*x + i]= lrintf(os07 - od07);
99  data[1*x + i]= lrintf(os16 + od16);
100  data[6*x + i]= lrintf(os16 - od16);
101  data[2*x + i]= lrintf(os25 + od25);
102  data[5*x + i]= lrintf(os25 - od25);
103  data[3*x + i]= lrintf(os34 - od34);
104  data[4*x + i]= lrintf(os34 + od34);
105  }else if(type==2){
106  dest[0*stride + i]= av_clip_uint8(((int)dest[0*stride + i]) + lrintf(os07 + od07));
107  dest[7*stride + i]= av_clip_uint8(((int)dest[7*stride + i]) + lrintf(os07 - od07));
108  dest[1*stride + i]= av_clip_uint8(((int)dest[1*stride + i]) + lrintf(os16 + od16));
109  dest[6*stride + i]= av_clip_uint8(((int)dest[6*stride + i]) + lrintf(os16 - od16));
110  dest[2*stride + i]= av_clip_uint8(((int)dest[2*stride + i]) + lrintf(os25 + od25));
111  dest[5*stride + i]= av_clip_uint8(((int)dest[5*stride + i]) + lrintf(os25 - od25));
112  dest[3*stride + i]= av_clip_uint8(((int)dest[3*stride + i]) + lrintf(os34 - od34));
113  dest[4*stride + i]= av_clip_uint8(((int)dest[4*stride + i]) + lrintf(os34 + od34));
114  }else{
115  dest[0*stride + i]= av_clip_uint8(lrintf(os07 + od07));
116  dest[7*stride + i]= av_clip_uint8(lrintf(os07 - od07));
117  dest[1*stride + i]= av_clip_uint8(lrintf(os16 + od16));
118  dest[6*stride + i]= av_clip_uint8(lrintf(os16 - od16));
119  dest[2*stride + i]= av_clip_uint8(lrintf(os25 + od25));
120  dest[5*stride + i]= av_clip_uint8(lrintf(os25 - od25));
121  dest[3*stride + i]= av_clip_uint8(lrintf(os34 - od34));
122  dest[4*stride + i]= av_clip_uint8(lrintf(os34 + od34));
123  }
124  }
125 }
126 
127 void ff_faanidct(int16_t block[64]){
128  FLOAT temp[64];
129  int i;
130 
131  emms_c();
132 
133  for(i=0; i<64; i++)
134  temp[i] = block[i] * prescale[i];
135 
136  p8idct(block, temp, NULL, 0, 1, 8, 0);
137  p8idct(block, temp, NULL, 0, 8, 1, 1);
138 }
139 
140 void ff_faanidct_add(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
141 {
142  FLOAT temp[64];
143  int i;
144 
145  emms_c();
146 
147  for(i=0; i<64; i++)
148  temp[i] = block[i] * prescale[i];
149 
150  p8idct(block, temp, NULL, 0, 1, 8, 0);
151  p8idct(NULL , temp, dest, line_size, 8, 1, 2);
152 }
153 
154 void ff_faanidct_put(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
155 {
156  FLOAT temp[64];
157  int i;
158 
159  emms_c();
160 
161  for(i=0; i<64; i++)
162  temp[i] = block[i] * prescale[i];
163 
164  p8idct(block, temp, NULL, 0, 1, 8, 0);
165  p8idct(NULL , temp, dest, line_size, 8, 1, 3);
166 }
stride
int stride
Definition: mace.c:144
p8idct
static void p8idct(int16_t data[64], FLOAT temp[64], uint8_t *dest, ptrdiff_t stride, int x, int y, int type)
Definition: faanidct.c:50
B0
#define B0
Definition: faanidct.c:27
data
const char data[16]
Definition: mxf.c:91
A2
#define A2
Definition: faanidct.c:37
x
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new please make sure they are as small as space on each network bandwidth and so on benefit from smaller test cases Also keep in mind older checkouts use existing sample that means in practice generally do not remove or overwrite files as it likely would break older checkouts or releases Also all needed samples for a commit should be ideally before the push If you need an account for frequently uploading samples or you wish to help others by doing that send a mail to ffmpeg devel rsync vauL Duo x
Definition: fate.txt:150
type
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 type
Definition: writing_filters.txt:86
A4
#define A4
Definition: faanidct.c:36
emms_c
#define emms_c()
Definition: internal.h:55
ff_faanidct_add
void ff_faanidct_add(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
Definition: faanidct.c:140
ff_faanidct
void ff_faanidct(int16_t block[64])
Definition: faanidct.c:127
B2
#define B2
Definition: faanidct.c:29
prescale
static const FLOAT prescale[64]
Definition: faanidct.c:39
NULL
#define NULL
Definition: coverity.c:32
B3
#define B3
Definition: faanidct.c:30
B5
#define B5
Definition: faanidct.c:32
ff_faanidct_put
void ff_faanidct_put(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
Definition: faanidct.c:154
B7
#define B7
Definition: faanidct.c:34
faanidct.h
lrintf
#define lrintf(x)
Definition: libm_mips.h:70
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
common.h
uint8_t
uint8_t
Definition: audio_convert.c:194
FLOAT
float FLOAT
Definition: faandct.c:32
B6
#define B6
Definition: faanidct.c:33
temp
else temp
Definition: vf_mcdeint.c:256
FLOAT
float FLOAT
Definition: faanidct.c:25
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
B1
#define B1
Definition: faanidct.c:28
B4
#define B4
Definition: faanidct.c:31