| 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 | } |