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fft_vsx.c
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1 /*
2  * FFT transform, optimized with VSX built-in functions
3  * Copyright (c) 2014 Rong Yan
4  *
5  * This algorithm (though not any of the implementation details) is
6  * based on libdjbfft by D. J. Bernstein.
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 
26 #include "config.h"
27 #include "libavutil/cpu.h"
28 #include "libavutil/ppc/types_altivec.h"
29 #include "libavutil/ppc/util_altivec.h"
30 #include "libavcodec/fft.h"
31 #include "libavcodec/fft-internal.h"
32 #include "fft_vsx.h"
33 
34 #if HAVE_VSX
35 
36 static void fft32_vsx_interleave(FFTComplex *z)
37 {
38  fft16_vsx_interleave(z);
39  fft8_vsx_interleave(z+16);
40  fft8_vsx_interleave(z+24);
41  pass_vsx_interleave(z,ff_cos_32,4);
42 }
43 
44 static void fft64_vsx_interleave(FFTComplex *z)
45 {
46  fft32_vsx_interleave(z);
47  fft16_vsx_interleave(z+32);
48  fft16_vsx_interleave(z+48);
49  pass_vsx_interleave(z,ff_cos_64, 8);
50 }
51 static void fft128_vsx_interleave(FFTComplex *z)
52 {
53  fft64_vsx_interleave(z);
54  fft32_vsx_interleave(z+64);
55  fft32_vsx_interleave(z+96);
56  pass_vsx_interleave(z,ff_cos_128,16);
57 }
58 static void fft256_vsx_interleave(FFTComplex *z)
59 {
60  fft128_vsx_interleave(z);
61  fft64_vsx_interleave(z+128);
62  fft64_vsx_interleave(z+192);
63  pass_vsx_interleave(z,ff_cos_256,32);
64 }
65 static void fft512_vsx_interleave(FFTComplex *z)
66 {
67  fft256_vsx_interleave(z);
68  fft128_vsx_interleave(z+256);
69  fft128_vsx_interleave(z+384);
70  pass_vsx_interleave(z,ff_cos_512,64);
71 }
72 static void fft1024_vsx_interleave(FFTComplex *z)
73 {
74  fft512_vsx_interleave(z);
75  fft256_vsx_interleave(z+512);
76  fft256_vsx_interleave(z+768);
77  pass_vsx_interleave(z,ff_cos_1024,128);
78 
79 }
80 static void fft2048_vsx_interleave(FFTComplex *z)
81 {
82  fft1024_vsx_interleave(z);
83  fft512_vsx_interleave(z+1024);
84  fft512_vsx_interleave(z+1536);
85  pass_vsx_interleave(z,ff_cos_2048,256);
86 }
87 static void fft4096_vsx_interleave(FFTComplex *z)
88 {
89  fft2048_vsx_interleave(z);
90  fft1024_vsx_interleave(z+2048);
91  fft1024_vsx_interleave(z+3072);
92  pass_vsx_interleave(z,ff_cos_4096, 512);
93 }
94 static void fft8192_vsx_interleave(FFTComplex *z)
95 {
96  fft4096_vsx_interleave(z);
97  fft2048_vsx_interleave(z+4096);
98  fft2048_vsx_interleave(z+6144);
99  pass_vsx_interleave(z,ff_cos_8192,1024);
100 }
101 static void fft16384_vsx_interleave(FFTComplex *z)
102 {
103  fft8192_vsx_interleave(z);
104  fft4096_vsx_interleave(z+8192);
105  fft4096_vsx_interleave(z+12288);
106  pass_vsx_interleave(z,ff_cos_16384,2048);
107 }
108 static void fft32768_vsx_interleave(FFTComplex *z)
109 {
110  fft16384_vsx_interleave(z);
111  fft8192_vsx_interleave(z+16384);
112  fft8192_vsx_interleave(z+24576);
113  pass_vsx_interleave(z,ff_cos_32768,4096);
114 }
115 static void fft65536_vsx_interleave(FFTComplex *z)
116 {
117  fft32768_vsx_interleave(z);
118  fft16384_vsx_interleave(z+32768);
119  fft16384_vsx_interleave(z+49152);
120  pass_vsx_interleave(z,ff_cos_65536,8192);
121 }
122 
123 static void fft32_vsx(FFTComplex *z)
124 {
125  fft16_vsx(z);
126  fft8_vsx(z+16);
127  fft8_vsx(z+24);
128  pass_vsx(z,ff_cos_32,4);
129 }
130 
131 static void fft64_vsx(FFTComplex *z)
132 {
133  fft32_vsx(z);
134  fft16_vsx(z+32);
135  fft16_vsx(z+48);
136  pass_vsx(z,ff_cos_64, 8);
137 }
138 static void fft128_vsx(FFTComplex *z)
139 {
140  fft64_vsx(z);
141  fft32_vsx(z+64);
142  fft32_vsx(z+96);
143  pass_vsx(z,ff_cos_128,16);
144 }
145 static void fft256_vsx(FFTComplex *z)
146 {
147  fft128_vsx(z);
148  fft64_vsx(z+128);
149  fft64_vsx(z+192);
150  pass_vsx(z,ff_cos_256,32);
151 }
152 static void fft512_vsx(FFTComplex *z)
153 {
154  fft256_vsx(z);
155  fft128_vsx(z+256);
156  fft128_vsx(z+384);
157  pass_vsx(z,ff_cos_512,64);
158 }
159 static void fft1024_vsx(FFTComplex *z)
160 {
161  fft512_vsx(z);
162  fft256_vsx(z+512);
163  fft256_vsx(z+768);
164  pass_vsx(z,ff_cos_1024,128);
165 
166 }
167 static void fft2048_vsx(FFTComplex *z)
168 {
169  fft1024_vsx(z);
170  fft512_vsx(z+1024);
171  fft512_vsx(z+1536);
172  pass_vsx(z,ff_cos_2048,256);
173 }
174 static void fft4096_vsx(FFTComplex *z)
175 {
176  fft2048_vsx(z);
177  fft1024_vsx(z+2048);
178  fft1024_vsx(z+3072);
179  pass_vsx(z,ff_cos_4096, 512);
180 }
181 static void fft8192_vsx(FFTComplex *z)
182 {
183  fft4096_vsx(z);
184  fft2048_vsx(z+4096);
185  fft2048_vsx(z+6144);
186  pass_vsx(z,ff_cos_8192,1024);
187 }
188 static void fft16384_vsx(FFTComplex *z)
189 {
190  fft8192_vsx(z);
191  fft4096_vsx(z+8192);
192  fft4096_vsx(z+12288);
193  pass_vsx(z,ff_cos_16384,2048);
194 }
195 static void fft32768_vsx(FFTComplex *z)
196 {
197  fft16384_vsx(z);
198  fft8192_vsx(z+16384);
199  fft8192_vsx(z+24576);
200  pass_vsx(z,ff_cos_32768,4096);
201 }
202 static void fft65536_vsx(FFTComplex *z)
203 {
204  fft32768_vsx(z);
205  fft16384_vsx(z+32768);
206  fft16384_vsx(z+49152);
207  pass_vsx(z,ff_cos_65536,8192);
208 }
209 
210 static void (* const fft_dispatch_vsx[])(FFTComplex*) = {
211  fft4_vsx, fft8_vsx, fft16_vsx, fft32_vsx, fft64_vsx, fft128_vsx, fft256_vsx, fft512_vsx, fft1024_vsx,
212  fft2048_vsx, fft4096_vsx, fft8192_vsx, fft16384_vsx, fft32768_vsx, fft65536_vsx,
213 };
214 static void (* const fft_dispatch_vsx_interleave[])(FFTComplex*) = {
215  fft4_vsx_interleave, fft8_vsx_interleave, fft16_vsx_interleave, fft32_vsx_interleave, fft64_vsx_interleave,
216  fft128_vsx_interleave, fft256_vsx_interleave, fft512_vsx_interleave, fft1024_vsx_interleave,
217  fft2048_vsx_interleave, fft4096_vsx_interleave, fft8192_vsx_interleave, fft16384_vsx_interleave, fft32768_vsx_interleave, fft65536_vsx_interleave,
218 };
219 void ff_fft_calc_interleave_vsx(FFTContext *s, FFTComplex *z)
220 {
221  fft_dispatch_vsx_interleave[s->nbits-2](z);
222 }
223 void ff_fft_calc_vsx(FFTContext *s, FFTComplex *z)
224 {
225  fft_dispatch_vsx[s->nbits-2](z);
226 }
227 #endif /* HAVE_VSX */
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