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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 | } |