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1 | /* |
2 | * Altivec optimized MP3 decoding functions | |
3 | * Copyright (c) 2010 Vitor Sessak | |
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 | #include "config.h" | |
23 | #include "libavutil/attributes.h" | |
24 | #include "libavutil/cpu.h" | |
25 | #include "libavutil/internal.h" | |
26 | #include "libavutil/ppc/cpu.h" | |
27 | #include "libavutil/ppc/util_altivec.h" | |
28 | #include "libavcodec/mpegaudiodsp.h" | |
29 | ||
30 | #if HAVE_ALTIVEC | |
31 | ||
32 | #define MACS(rt, ra, rb) rt+=(ra)*(rb) | |
33 | #define MLSS(rt, ra, rb) rt-=(ra)*(rb) | |
34 | ||
35 | #define SUM8(op, sum, w, p) \ | |
36 | { \ | |
37 | op(sum, (w)[0 * 64], (p)[0 * 64]); \ | |
38 | op(sum, (w)[1 * 64], (p)[1 * 64]); \ | |
39 | op(sum, (w)[2 * 64], (p)[2 * 64]); \ | |
40 | op(sum, (w)[3 * 64], (p)[3 * 64]); \ | |
41 | op(sum, (w)[4 * 64], (p)[4 * 64]); \ | |
42 | op(sum, (w)[5 * 64], (p)[5 * 64]); \ | |
43 | op(sum, (w)[6 * 64], (p)[6 * 64]); \ | |
44 | op(sum, (w)[7 * 64], (p)[7 * 64]); \ | |
45 | } | |
46 | ||
47 | static void apply_window(const float *buf, const float *win1, | |
48 | const float *win2, float *sum1, float *sum2, int len) | |
49 | { | |
50 | const vector float *win1a = (const vector float *) win1; | |
51 | const vector float *win2a = (const vector float *) win2; | |
52 | const vector float *bufa = (const vector float *) buf; | |
53 | vector float *sum1a = (vector float *) sum1; | |
54 | vector float *sum2a = (vector float *) sum2; | |
55 | vector float av_uninit(v0), av_uninit(v4); | |
56 | vector float v1, v2, v3; | |
57 | ||
58 | len = len >> 2; | |
59 | ||
60 | #define MULT(a, b) \ | |
61 | { \ | |
62 | v1 = vec_ld(a, win1a); \ | |
63 | v2 = vec_ld(b, win2a); \ | |
64 | v3 = vec_ld(a, bufa); \ | |
65 | v0 = vec_madd(v3, v1, v0); \ | |
66 | v4 = vec_madd(v2, v3, v4); \ | |
67 | } | |
68 | ||
69 | while (len--) { | |
70 | v0 = vec_xor(v0, v0); | |
71 | v4 = vec_xor(v4, v4); | |
72 | ||
73 | MULT( 0, 0); | |
74 | MULT( 256, 64); | |
75 | MULT( 512, 128); | |
76 | MULT( 768, 192); | |
77 | MULT(1024, 256); | |
78 | MULT(1280, 320); | |
79 | MULT(1536, 384); | |
80 | MULT(1792, 448); | |
81 | ||
82 | vec_st(v0, 0, sum1a); | |
83 | vec_st(v4, 0, sum2a); | |
84 | sum1a++; | |
85 | sum2a++; | |
86 | win1a++; | |
87 | win2a++; | |
88 | bufa++; | |
89 | } | |
90 | } | |
91 | ||
92 | static void apply_window_mp3(float *in, float *win, int *unused, float *out, | |
93 | int incr) | |
94 | { | |
95 | LOCAL_ALIGNED_16(float, suma, [17]); | |
96 | LOCAL_ALIGNED_16(float, sumb, [17]); | |
97 | LOCAL_ALIGNED_16(float, sumc, [17]); | |
98 | LOCAL_ALIGNED_16(float, sumd, [17]); | |
99 | ||
100 | float sum; | |
101 | int j; | |
102 | float *out2 = out + 32 * incr; | |
103 | ||
104 | /* copy to avoid wrap */ | |
105 | memcpy(in + 512, in, 32 * sizeof(*in)); | |
106 | ||
107 | apply_window(in + 16, win , win + 512, suma, sumc, 16); | |
108 | apply_window(in + 32, win + 48, win + 640, sumb, sumd, 16); | |
109 | ||
110 | SUM8(MLSS, suma[0], win + 32, in + 48); | |
111 | ||
112 | sumc[ 0] = 0; | |
113 | sumb[16] = 0; | |
114 | sumd[16] = 0; | |
115 | ||
116 | out[0 ] = suma[ 0]; | |
117 | out += incr; | |
118 | out2 -= incr; | |
119 | for(j=1;j<16;j++) { | |
120 | *out = suma[ j] - sumd[16-j]; | |
121 | *out2 = -sumb[16-j] - sumc[ j]; | |
122 | out += incr; | |
123 | out2 -= incr; | |
124 | } | |
125 | ||
126 | sum = 0; | |
127 | SUM8(MLSS, sum, win + 16 + 32, in + 32); | |
128 | *out = sum; | |
129 | } | |
130 | ||
131 | #endif /* HAVE_ALTIVEC */ | |
132 | ||
133 | av_cold void ff_mpadsp_init_ppc(MPADSPContext *s) | |
134 | { | |
135 | #if HAVE_ALTIVEC | |
136 | if (!PPC_ALTIVEC(av_get_cpu_flags())) | |
137 | return; | |
138 | ||
139 | s->apply_window_float = apply_window_mp3; | |
140 | #endif /* HAVE_ALTIVEC */ | |
141 | } |