VC1: merge idct8x8, coeff adjustments and put_pixels.
[ffmpeg.git] / libavcodec / ppc / idct_altivec.c
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 "libavcodec/dsputil.h"
45 #include "types_altivec.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
153 static 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
161 void 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
183 void 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 }
218