| 1 | /* |
| 2 | * Copyright (c) 2002 Dieter Shirley |
| 3 | * |
| 4 | * dct_unquantize_h263_altivec: |
| 5 | * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org> |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | #include <stdlib.h> |
| 25 | #include <stdio.h> |
| 26 | |
| 27 | #include "config.h" |
| 28 | #include "libavutil/attributes.h" |
| 29 | #include "libavutil/cpu.h" |
| 30 | #include "libavutil/ppc/cpu.h" |
| 31 | #include "libavutil/ppc/types_altivec.h" |
| 32 | #include "libavutil/ppc/util_altivec.h" |
| 33 | #include "libavcodec/mpegvideo.h" |
| 34 | |
| 35 | #if HAVE_ALTIVEC |
| 36 | |
| 37 | /* AltiVec version of dct_unquantize_h263 |
| 38 | this code assumes `block' is 16 bytes-aligned */ |
| 39 | static void dct_unquantize_h263_altivec(MpegEncContext *s, |
| 40 | int16_t *block, int n, int qscale) |
| 41 | { |
| 42 | int i, level, qmul, qadd; |
| 43 | int nCoeffs; |
| 44 | |
| 45 | assert(s->block_last_index[n]>=0); |
| 46 | |
| 47 | qadd = (qscale - 1) | 1; |
| 48 | qmul = qscale << 1; |
| 49 | |
| 50 | if (s->mb_intra) { |
| 51 | if (!s->h263_aic) { |
| 52 | if (n < 4) |
| 53 | block[0] = block[0] * s->y_dc_scale; |
| 54 | else |
| 55 | block[0] = block[0] * s->c_dc_scale; |
| 56 | }else |
| 57 | qadd = 0; |
| 58 | i = 1; |
| 59 | nCoeffs= 63; //does not always use zigzag table |
| 60 | } else { |
| 61 | i = 0; |
| 62 | nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ]; |
| 63 | } |
| 64 | |
| 65 | { |
| 66 | register const vector signed short vczero = (const vector signed short)vec_splat_s16(0); |
| 67 | DECLARE_ALIGNED(16, short, qmul8) = qmul; |
| 68 | DECLARE_ALIGNED(16, short, qadd8) = qadd; |
| 69 | register vector signed short blockv, qmulv, qaddv, nqaddv, temp1; |
| 70 | register vector bool short blockv_null, blockv_neg; |
| 71 | register short backup_0 = block[0]; |
| 72 | register int j = 0; |
| 73 | |
| 74 | qmulv = vec_splat((vec_s16)vec_lde(0, &qmul8), 0); |
| 75 | qaddv = vec_splat((vec_s16)vec_lde(0, &qadd8), 0); |
| 76 | nqaddv = vec_sub(vczero, qaddv); |
| 77 | |
| 78 | // vectorize all the 16 bytes-aligned blocks |
| 79 | // of 8 elements |
| 80 | for(; (j + 7) <= nCoeffs ; j+=8) { |
| 81 | blockv = vec_ld(j << 1, block); |
| 82 | blockv_neg = vec_cmplt(blockv, vczero); |
| 83 | blockv_null = vec_cmpeq(blockv, vczero); |
| 84 | // choose between +qadd or -qadd as the third operand |
| 85 | temp1 = vec_sel(qaddv, nqaddv, blockv_neg); |
| 86 | // multiply & add (block{i,i+7} * qmul [+-] qadd) |
| 87 | temp1 = vec_mladd(blockv, qmulv, temp1); |
| 88 | // put 0 where block[{i,i+7} used to have 0 |
| 89 | blockv = vec_sel(temp1, blockv, blockv_null); |
| 90 | vec_st(blockv, j << 1, block); |
| 91 | } |
| 92 | |
| 93 | // if nCoeffs isn't a multiple of 8, finish the job |
| 94 | // using good old scalar units. |
| 95 | // (we could do it using a truncated vector, |
| 96 | // but I'm not sure it's worth the hassle) |
| 97 | for(; j <= nCoeffs ; j++) { |
| 98 | level = block[j]; |
| 99 | if (level) { |
| 100 | if (level < 0) { |
| 101 | level = level * qmul - qadd; |
| 102 | } else { |
| 103 | level = level * qmul + qadd; |
| 104 | } |
| 105 | block[j] = level; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | if (i == 1) { |
| 110 | // cheat. this avoid special-casing the first iteration |
| 111 | block[0] = backup_0; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | #endif /* HAVE_ALTIVEC */ |
| 117 | |
| 118 | av_cold void ff_mpv_common_init_ppc(MpegEncContext *s) |
| 119 | { |
| 120 | #if HAVE_ALTIVEC |
| 121 | if (!PPC_ALTIVEC(av_get_cpu_flags())) |
| 122 | return; |
| 123 | |
| 124 | if ((s->avctx->dct_algo == FF_DCT_AUTO) || |
| 125 | (s->avctx->dct_algo == FF_DCT_ALTIVEC)) { |
| 126 | s->dct_unquantize_h263_intra = dct_unquantize_h263_altivec; |
| 127 | s->dct_unquantize_h263_inter = dct_unquantize_h263_altivec; |
| 128 | } |
| 129 | #endif /* HAVE_ALTIVEC */ |
| 130 | } |