iirfilter_mips.c
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1 /*
2  * Copyright (c) 2012
3  * MIPS Technologies, Inc., California.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
14  * contributors may be used to endorse or promote products derived from
15  * this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * Author: Bojan Zivkovic (bojan@mips.com)
30  *
31  * IIR filter optimized for MIPS floating-point architecture
32  *
33  * This file is part of FFmpeg.
34  *
35  * FFmpeg is free software; you can redistribute it and/or
36  * modify it under the terms of the GNU Lesser General Public
37  * License as published by the Free Software Foundation; either
38  * version 2.1 of the License, or (at your option) any later version.
39  *
40  * FFmpeg is distributed in the hope that it will be useful,
41  * but WITHOUT ANY WARRANTY; without even the implied warranty of
42  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
43  * Lesser General Public License for more details.
44  *
45  * You should have received a copy of the GNU Lesser General Public
46  * License along with FFmpeg; if not, write to the Free Software
47  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
48  */
49 
50  /**
51  * @file
52  * Reference: libavcodec/iirfilter.c
53  */
54 
55 #include "libavcodec/iirfilter.h"
56 
57 #if HAVE_INLINE_ASM
58 typedef struct FFIIRFilterCoeffs {
59  int order;
60  float gain;
61  int *cx;
62  float *cy;
63 } FFIIRFilterCoeffs;
64 
65 typedef struct FFIIRFilterState {
66  float x[1];
67 } FFIIRFilterState;
68 
69 static void ff_iir_filter_flt_mips(const struct FFIIRFilterCoeffs *c,
70  struct FFIIRFilterState *s, int size,
71  const float *src, int sstep, float *dst, int dstep)
72 {
73  if (c->order == 2) {
74  int i;
75  const float *src0 = src;
76  float *dst0 = dst;
77  for (i = 0; i < size; i++) {
78  float in = *src0 * c->gain + s->x[0] * c->cy[0] + s->x[1] * c->cy[1];
79  *dst0 = s->x[0] + in + s->x[1] * c->cx[1];
80  s->x[0] = s->x[1];
81  s->x[1] = in;
82  src0 += sstep;
83  dst0 += dstep;
84  }
85  } else if (c->order == 4) {
86  int i;
87  const float *src0 = src;
88  float *dst0 = dst;
89  float four = 4.0;
90  float six = 6.0;
91  for (i = 0; i < size; i += 4) {
92  float in1, in2, in3, in4;
93  float res1, res2, res3, res4;
94  float *x = s->x;
95  float *cy = c->cy;
96  float gain = c->gain;
97  float src0_0 = src0[0 ];
98  float src0_1 = src0[sstep ];
99  float src0_2 = src0[2*sstep];
100  float src0_3 = src0[3*sstep];
101 
102  __asm__ volatile (
103  "lwc1 $f0, 0(%[cy]) \n\t"
104  "lwc1 $f4, 0(%[x]) \n\t"
105  "lwc1 $f5, 4(%[x]) \n\t"
106  "lwc1 $f6, 8(%[x]) \n\t"
107  "lwc1 $f7, 12(%[x]) \n\t"
108  "mul.s %[in1], %[src0_0], %[gain] \n\t"
109  "mul.s %[in2], %[src0_1], %[gain] \n\t"
110  "mul.s %[in3], %[src0_2], %[gain] \n\t"
111  "mul.s %[in4], %[src0_3], %[gain] \n\t"
112  "lwc1 $f1, 4(%[cy]) \n\t"
113  "madd.s %[in1], %[in1], $f0, $f4 \n\t"
114  "madd.s %[in2], %[in2], $f0, $f5 \n\t"
115  "madd.s %[in3], %[in3], $f0, $f6 \n\t"
116  "madd.s %[in4], %[in4], $f0, $f7 \n\t"
117  "lwc1 $f2, 8(%[cy]) \n\t"
118  "madd.s %[in1], %[in1], $f1, $f5 \n\t"
119  "madd.s %[in2], %[in2], $f1, $f6 \n\t"
120  "madd.s %[in3], %[in3], $f1, $f7 \n\t"
121  "lwc1 $f3, 12(%[cy]) \n\t"
122  "add.s $f8, $f5, $f7 \n\t"
123  "madd.s %[in1], %[in1], $f2, $f6 \n\t"
124  "madd.s %[in2], %[in2], $f2, $f7 \n\t"
125  "mul.s $f9, $f6, %[six] \n\t"
126  "mul.s $f10, $f7, %[six] \n\t"
127  "madd.s %[in1], %[in1], $f3, $f7 \n\t"
128  "madd.s %[in2], %[in2], $f3, %[in1] \n\t"
129  "madd.s %[in3], %[in3], $f2, %[in1] \n\t"
130  "madd.s %[in4], %[in4], $f1, %[in1] \n\t"
131  "add.s %[res1], $f4, %[in1] \n\t"
132  "swc1 %[in1], 0(%[x]) \n\t"
133  "add.s $f0, $f6, %[in1] \n\t"
134  "madd.s %[in3], %[in3], $f3, %[in2] \n\t"
135  "madd.s %[in4], %[in4], $f2, %[in2] \n\t"
136  "add.s %[res2], $f5, %[in2] \n\t"
137  "madd.s %[res1], %[res1], $f8, %[four] \n\t"
138  "add.s $f8, $f7, %[in2] \n\t"
139  "swc1 %[in2], 4(%[x]) \n\t"
140  "madd.s %[in4], %[in4], $f3, %[in3] \n\t"
141  "add.s %[res3], $f6, %[in3] \n\t"
142  "add.s %[res1], %[res1], $f9 \n\t"
143  "madd.s %[res2], %[res2], $f0, %[four] \n\t"
144  "swc1 %[in3], 8(%[x]) \n\t"
145  "add.s %[res4], $f7, %[in4] \n\t"
146  "madd.s %[res3], %[res3], $f8, %[four] \n\t"
147  "swc1 %[in4], 12(%[x]) \n\t"
148  "add.s %[res2], %[res2], $f10 \n\t"
149  "add.s $f8, %[in1], %[in3] \n\t"
150  "madd.s %[res3], %[res3], %[in1], %[six] \n\t"
151  "madd.s %[res4], %[res4], $f8, %[four] \n\t"
152  "madd.s %[res4], %[res4], %[in2], %[six] \n\t"
153 
154  : [in1]"=&f"(in1), [in2]"=&f"(in2),
155  [in3]"=&f"(in3), [in4]"=&f"(in4),
156  [res1]"=&f"(res1), [res2]"=&f"(res2),
157  [res3]"=&f"(res3), [res4]"=&f"(res4)
158  : [src0_0]"f"(src0_0), [src0_1]"f"(src0_1),
159  [src0_2]"f"(src0_2), [src0_3]"f"(src0_3),
160  [gain]"f"(gain), [x]"r"(x), [cy]"r"(cy),
161  [four]"f"(four), [six]"f"(six)
162  : "$f0", "$f1", "$f2", "$f3",
163  "$f4", "$f5", "$f6", "$f7",
164  "$f8", "$f9", "$f10",
165  "memory"
166  );
167 
168  dst0[0 ] = res1;
169  dst0[sstep ] = res2;
170  dst0[2*sstep] = res3;
171  dst0[3*sstep] = res4;
172 
173  src0 += 4*sstep;
174  dst0 += 4*dstep;
175  }
176  } else {
177  int i;
178  const float *src0 = src;
179  float *dst0 = dst;
180  for (i = 0; i < size; i++) {
181  int j;
182  float in, res;
183  in = *src0 * c->gain;
184  for(j = 0; j < c->order; j++)
185  in += c->cy[j] * s->x[j];
186  res = s->x[0] + in + s->x[c->order >> 1] * c->cx[c->order >> 1];
187  for(j = 1; j < c->order >> 1; j++)
188  res += (s->x[j] + s->x[c->order - j]) * c->cx[j];
189  for(j = 0; j < c->order - 1; j++)
190  s->x[j] = s->x[j + 1];
191  *dst0 = res;
192  s->x[c->order - 1] = in;
193  src0 += sstep;
194  dst0 += dstep;
195  }
196  }
197 }
198 #endif /* HAVE_INLINE_ASM */
199 
200 void ff_iir_filter_init_mips(FFIIRFilterContext *f) {
201 #if HAVE_INLINE_ASM
202  f->filter_flt = ff_iir_filter_flt_mips;
203 #endif /* HAVE_INLINE_ASM */
204 }
s
const char * s
Definition: avisynth_c.h:668
f
Sinusoidal phase f
Definition: FFT of a Simple Sinusoid.m:8
in
About Git write you should know how to use GIT properly Luckily Git comes with excellent documentation git help man git shows you the available git< command > help man git< command > shows information about the subcommand< command > The most comprehensive manual is the website Git Reference visit they are quite exhaustive You do not need a special username or password All you need is to provide a ssh public key to the Git server admin What follows now is a basic introduction to Git and some FFmpeg specific guidelines Read it at least if you are granted commit privileges to the FFmpeg project you are expected to be familiar with these rules I if not You can get git from etc no matter how small Every one of them has been saved from looking like a fool by this many times It s very easy for stray debug output or cosmetic modifications to slip in
Definition: git-howto.txt:5
FFIIRFilterState
struct FFIIRFilterState FFIIRFilterState
IIR filter state.
FFIIRFilterCoeffs
struct FFIIRFilterCoeffs FFIIRFilterCoeffs
IIR filter global parameters.
x
Discrete Time axis x
Definition: FFT of a Simple Sinusoid.m:10
size
int size
Definition: twinvq_data.h:11127
FFIIRFilterState
IIR filter state.
Definition: iirfilter.c:44
FFIIRFilterContext::filter_flt
void(* filter_flt)(const struct FFIIRFilterCoeffs *coeffs, struct FFIIRFilterState *state, int size, const float *src, int sstep, float *dst, int dstep)
Perform IIR filtering on floating-point input samples.
Definition: iirfilter.h:62
ff_iir_filter_init_mips
void ff_iir_filter_init_mips(FFIIRFilterContext *f)
Definition: iirfilter_mips.c:200
FFIIRFilterState::x
float x[1]
Definition: iirfilter.c:45
src
AVS_Value src
Definition: avisynth_c.h:523
i
synthesis window for stochastic i
Definition: code Kat/hpsmodel.m:34
FFIIRFilterCoeffs
IIR filter global parameters.
Definition: iirfilter.c:34
c
static double c[64]
Definition: vsrc_mptestsrc.c:88
iirfilter.h
IIR filter interface.
dst
else dst[i][x+y *dst_stride[i]]
Definition: vf_mcdeint.c:160
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