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/mem_internal.h"
27 #include "libavutil/ppc/cpu.h"
28 #include "libavutil/ppc/util_altivec.h"
29 #include "libavcodec/mpegaudiodsp.h"
30
31 #if HAVE_ALTIVEC
32
33 #define MACS(rt, ra, rb) rt+=(ra)*(rb)
34 #define MLSS(rt, ra, rb) rt-=(ra)*(rb)
35
36 #define SUM8(op, sum, w, p) \
37 { \
38 op(sum, (w)[0 * 64], (p)[0 * 64]); \
39 op(sum, (w)[1 * 64], (p)[1 * 64]); \
40 op(sum, (w)[2 * 64], (p)[2 * 64]); \
41 op(sum, (w)[3 * 64], (p)[3 * 64]); \
42 op(sum, (w)[4 * 64], (p)[4 * 64]); \
43 op(sum, (w)[5 * 64], (p)[5 * 64]); \
44 op(sum, (w)[6 * 64], (p)[6 * 64]); \
45 op(sum, (w)[7 * 64], (p)[7 * 64]); \
46 }
47
apply_window(const float * buf,const float * win1,const float * win2,float * sum1,float * sum2,int len)48 static void apply_window(const float *buf, const float *win1,
49 const float *win2, float *sum1, float *sum2, int len)
50 {
51 const vector float *win1a = (const vector float *) win1;
52 const vector float *win2a = (const vector float *) win2;
53 const vector float *bufa = (const vector float *) buf;
54 vector float *sum1a = (vector float *) sum1;
55 vector float *sum2a = (vector float *) sum2;
56 vector float av_uninit(v0), av_uninit(v4);
57 vector float v1, v2, v3;
58
59 len = len >> 2;
60
61 #define MULT(a, b) \
62 { \
63 v1 = vec_ld(a, win1a); \
64 v2 = vec_ld(b, win2a); \
65 v3 = vec_ld(a, bufa); \
66 v0 = vec_madd(v3, v1, v0); \
67 v4 = vec_madd(v2, v3, v4); \
68 }
69
70 while (len--) {
71 v0 = vec_xor(v0, v0);
72 v4 = vec_xor(v4, v4);
73
74 MULT( 0, 0);
75 MULT( 256, 64);
76 MULT( 512, 128);
77 MULT( 768, 192);
78 MULT(1024, 256);
79 MULT(1280, 320);
80 MULT(1536, 384);
81 MULT(1792, 448);
82
83 vec_st(v0, 0, sum1a);
84 vec_st(v4, 0, sum2a);
85 sum1a++;
86 sum2a++;
87 win1a++;
88 win2a++;
89 bufa++;
90 }
91 }
92
apply_window_mp3(float * in,float * win,int * unused,float * out,ptrdiff_t incr)93 static void apply_window_mp3(float *in, float *win, int *unused, float *out,
94 ptrdiff_t incr)
95 {
96 LOCAL_ALIGNED_16(float, suma, [17]);
97 LOCAL_ALIGNED_16(float, sumb, [17]);
98 LOCAL_ALIGNED_16(float, sumc, [17]);
99 LOCAL_ALIGNED_16(float, sumd, [17]);
100
101 float sum;
102 int j;
103 float *out2 = out + 32 * incr;
104
105 /* copy to avoid wrap */
106 memcpy(in + 512, in, 32 * sizeof(*in));
107
108 apply_window(in + 16, win , win + 512, suma, sumc, 16);
109 apply_window(in + 32, win + 48, win + 640, sumb, sumd, 16);
110
111 SUM8(MLSS, suma[0], win + 32, in + 48);
112
113 sumc[ 0] = 0;
114 sumb[16] = 0;
115 sumd[16] = 0;
116
117 out[0 ] = suma[ 0];
118 out += incr;
119 out2 -= incr;
120 for(j=1;j<16;j++) {
121 *out = suma[ j] - sumd[16-j];
122 *out2 = -sumb[16-j] - sumc[ j];
123 out += incr;
124 out2 -= incr;
125 }
126
127 sum = 0;
128 SUM8(MLSS, sum, win + 16 + 32, in + 32);
129 *out = sum;
130 }
131
132 #endif /* HAVE_ALTIVEC */
133
ff_mpadsp_init_ppc(MPADSPContext * s)134 av_cold void ff_mpadsp_init_ppc(MPADSPContext *s)
135 {
136 #if HAVE_ALTIVEC
137 if (!PPC_ALTIVEC(av_get_cpu_flags()))
138 return;
139
140 s->apply_window_float = apply_window_mp3;
141 #endif /* HAVE_ALTIVEC */
142 }
143