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/libavcodec/ppc/idct_altivec.c

http://github.com/FFmpeg/FFmpeg
C | 217 lines | 166 code | 18 blank | 33 comment | 0 complexity | 5c3c4fac5a17f17e8bc425f59a871ad1 MD5 | raw file
  1/*
  2 * Copyright (c) 2001 Michel Lespinasse
  3 *
  4 * This file is part of FFmpeg.
  5 *
  6 * FFmpeg is free software; you can redistribute it and/or
  7 * modify it under the terms of the GNU Lesser General Public
  8 * License as published by the Free Software Foundation; either
  9 * version 2.1 of the License, or (at your option) any later version.
 10 *
 11 * FFmpeg is distributed in the hope that it will be useful,
 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 14 * Lesser General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU Lesser General Public
 17 * License along with FFmpeg; if not, write to the Free Software
 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 19 */
 20
 21/*
 22 * NOTE: This code is based on GPL code from the libmpeg2 project.  The
 23 * author, Michel Lespinasses, has given explicit permission to release
 24 * under LGPL as part of FFmpeg.
 25 */
 26
 27/*
 28 * FFmpeg integration by Dieter Shirley
 29 *
 30 * This file is a direct copy of the AltiVec IDCT module from the libmpeg2
 31 * project.  I've deleted all of the libmpeg2-specific code, renamed the
 32 * functions and reordered the function parameters.  The only change to the
 33 * IDCT function itself was to factor out the partial transposition, and to
 34 * perform a full transpose at the end of the function.
 35 */
 36
 37
 38#include <stdlib.h>                                      /* malloc(), free() */
 39#include <string.h>
 40#include "config.h"
 41#if HAVE_ALTIVEC_H
 42#include <altivec.h>
 43#endif
 44#include "libavutil/ppc/types_altivec.h"
 45#include "libavcodec/dsputil.h"
 46#include "dsputil_altivec.h"
 47
 48#define IDCT_HALF                                       \
 49    /* 1st stage */                                     \
 50    t1 = vec_mradds (a1, vx7, vx1 );                    \
 51    t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7));    \
 52    t7 = vec_mradds (a2, vx5, vx3);                     \
 53    t3 = vec_mradds (ma2, vx3, vx5);                    \
 54                                                        \
 55    /* 2nd stage */                                     \
 56    t5 = vec_adds (vx0, vx4);                           \
 57    t0 = vec_subs (vx0, vx4);                           \
 58    t2 = vec_mradds (a0, vx6, vx2);                     \
 59    t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6));    \
 60    t6 = vec_adds (t8, t3);                             \
 61    t3 = vec_subs (t8, t3);                             \
 62    t8 = vec_subs (t1, t7);                             \
 63    t1 = vec_adds (t1, t7);                             \
 64                                                        \
 65    /* 3rd stage */                                     \
 66    t7 = vec_adds (t5, t2);                             \
 67    t2 = vec_subs (t5, t2);                             \
 68    t5 = vec_adds (t0, t4);                             \
 69    t0 = vec_subs (t0, t4);                             \
 70    t4 = vec_subs (t8, t3);                             \
 71    t3 = vec_adds (t8, t3);                             \
 72                                                        \
 73    /* 4th stage */                                     \
 74    vy0 = vec_adds (t7, t1);                            \
 75    vy7 = vec_subs (t7, t1);                            \
 76    vy1 = vec_mradds (c4, t3, t5);                      \
 77    vy6 = vec_mradds (mc4, t3, t5);                     \
 78    vy2 = vec_mradds (c4, t4, t0);                      \
 79    vy5 = vec_mradds (mc4, t4, t0);                     \
 80    vy3 = vec_adds (t2, t6);                            \
 81    vy4 = vec_subs (t2, t6);
 82
 83
 84#define IDCT                                                            \
 85    vec_s16 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7;                \
 86    vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7;                \
 87    vec_s16 a0, a1, a2, ma2, c4, mc4, zero, bias;                  \
 88    vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8;                    \
 89    vec_u16 shift;                                                 \
 90                                                                        \
 91    c4 = vec_splat (constants[0], 0);                                   \
 92    a0 = vec_splat (constants[0], 1);                                   \
 93    a1 = vec_splat (constants[0], 2);                                   \
 94    a2 = vec_splat (constants[0], 3);                                   \
 95    mc4 = vec_splat (constants[0], 4);                                  \
 96    ma2 = vec_splat (constants[0], 5);                                  \
 97    bias = (vec_s16)vec_splat ((vec_s32)constants[0], 3);     \
 98                                                                        \
 99    zero = vec_splat_s16 (0);                                           \
100    shift = vec_splat_u16 (4);                                          \
101                                                                        \
102    vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero);    \
103    vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero);    \
104    vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero);    \
105    vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero);    \
106    vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero);    \
107    vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero);    \
108    vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero);    \
109    vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero);    \
110                                                                        \
111    IDCT_HALF                                                           \
112                                                                        \
113    vx0 = vec_mergeh (vy0, vy4);                                        \
114    vx1 = vec_mergel (vy0, vy4);                                        \
115    vx2 = vec_mergeh (vy1, vy5);                                        \
116    vx3 = vec_mergel (vy1, vy5);                                        \
117    vx4 = vec_mergeh (vy2, vy6);                                        \
118    vx5 = vec_mergel (vy2, vy6);                                        \
119    vx6 = vec_mergeh (vy3, vy7);                                        \
120    vx7 = vec_mergel (vy3, vy7);                                        \
121                                                                        \
122    vy0 = vec_mergeh (vx0, vx4);                                        \
123    vy1 = vec_mergel (vx0, vx4);                                        \
124    vy2 = vec_mergeh (vx1, vx5);                                        \
125    vy3 = vec_mergel (vx1, vx5);                                        \
126    vy4 = vec_mergeh (vx2, vx6);                                        \
127    vy5 = vec_mergel (vx2, vx6);                                        \
128    vy6 = vec_mergeh (vx3, vx7);                                        \
129    vy7 = vec_mergel (vx3, vx7);                                        \
130                                                                        \
131    vx0 = vec_adds (vec_mergeh (vy0, vy4), bias);                       \
132    vx1 = vec_mergel (vy0, vy4);                                        \
133    vx2 = vec_mergeh (vy1, vy5);                                        \
134    vx3 = vec_mergel (vy1, vy5);                                        \
135    vx4 = vec_mergeh (vy2, vy6);                                        \
136    vx5 = vec_mergel (vy2, vy6);                                        \
137    vx6 = vec_mergeh (vy3, vy7);                                        \
138    vx7 = vec_mergel (vy3, vy7);                                        \
139                                                                        \
140    IDCT_HALF                                                           \
141                                                                        \
142    shift = vec_splat_u16 (6);                                          \
143    vx0 = vec_sra (vy0, shift);                                         \
144    vx1 = vec_sra (vy1, shift);                                         \
145    vx2 = vec_sra (vy2, shift);                                         \
146    vx3 = vec_sra (vy3, shift);                                         \
147    vx4 = vec_sra (vy4, shift);                                         \
148    vx5 = vec_sra (vy5, shift);                                         \
149    vx6 = vec_sra (vy6, shift);                                         \
150    vx7 = vec_sra (vy7, shift);
151
152
153static const vec_s16 constants[5] = {
154    {23170, 13573,  6518, 21895, -23170, -21895,    32,    31},
155    {16384, 22725, 21407, 19266,  16384,  19266, 21407, 22725},
156    {22725, 31521, 29692, 26722,  22725,  26722, 29692, 31521},
157    {21407, 29692, 27969, 25172,  21407,  25172, 27969, 29692},
158    {19266, 26722, 25172, 22654,  19266,  22654, 25172, 26722}
159};
160
161void ff_idct_put_altivec(uint8_t* dest, int stride, int16_t *blk)
162{
163    vec_s16 *block = (vec_s16*)blk;
164    vec_u8 tmp;
165
166    IDCT
167
168#define COPY(dest,src)                                          \
169    tmp = vec_packsu (src, src);                                \
170    vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest);       \
171    vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest);
172
173    COPY (dest, vx0)    dest += stride;
174    COPY (dest, vx1)    dest += stride;
175    COPY (dest, vx2)    dest += stride;
176    COPY (dest, vx3)    dest += stride;
177    COPY (dest, vx4)    dest += stride;
178    COPY (dest, vx5)    dest += stride;
179    COPY (dest, vx6)    dest += stride;
180    COPY (dest, vx7)
181}
182
183void ff_idct_add_altivec(uint8_t* dest, int stride, int16_t *blk)
184{
185    vec_s16 *block = (vec_s16*)blk;
186    vec_u8 tmp;
187    vec_s16 tmp2, tmp3;
188    vec_u8 perm0;
189    vec_u8 perm1;
190    vec_u8 p0, p1, p;
191
192    IDCT
193
194    p0 = vec_lvsl (0, dest);
195    p1 = vec_lvsl (stride, dest);
196    p = vec_splat_u8 (-1);
197    perm0 = vec_mergeh (p, p0);
198    perm1 = vec_mergeh (p, p1);
199
200#define ADD(dest,src,perm)                                              \
201    /* *(uint64_t *)&tmp = *(uint64_t *)dest; */                        \
202    tmp = vec_ld (0, dest);                                             \
203    tmp2 = (vec_s16)vec_perm (tmp, (vec_u8)zero, perm);       \
204    tmp3 = vec_adds (tmp2, src);                                        \
205    tmp = vec_packsu (tmp3, tmp3);                                      \
206    vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest);               \
207    vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest);
208
209    ADD (dest, vx0, perm0)      dest += stride;
210    ADD (dest, vx1, perm1)      dest += stride;
211    ADD (dest, vx2, perm0)      dest += stride;
212    ADD (dest, vx3, perm1)      dest += stride;
213    ADD (dest, vx4, perm0)      dest += stride;
214    ADD (dest, vx5, perm1)      dest += stride;
215    ADD (dest, vx6, perm0)      dest += stride;
216    ADD (dest, vx7, perm1)
217}