ppc: don't return a value from a function declared void
[libav.git] / libswscale / ppc / yuv2yuv_altivec.c
1 /*
2 * AltiVec-enhanced yuv-to-yuv conversion routines.
3 *
4 * Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
5 * based on the equivalent C code in swscale.c
6 *
7 * This file is part of Libav.
8 *
9 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include <inttypes.h>
25
26 #include "config.h"
27 #include "libavutil/attributes.h"
28 #include "libavutil/cpu.h"
29 #include "libswscale/swscale.h"
30 #include "libswscale/swscale_internal.h"
31
32 #if HAVE_ALTIVEC
33
34 static int yv12toyuy2_unscaled_altivec(SwsContext *c, const uint8_t *src[],
35 int srcStride[], int srcSliceY,
36 int srcSliceH, uint8_t *dstParam[],
37 int dstStride_a[])
38 {
39 uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
40 // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
41 // srcStride[0], srcStride[1], dstStride[0]);
42 const uint8_t *ysrc = src[0];
43 const uint8_t *usrc = src[1];
44 const uint8_t *vsrc = src[2];
45 const int width = c->srcW;
46 const int height = srcSliceH;
47 const int lumStride = srcStride[0];
48 const int chromStride = srcStride[1];
49 const int dstStride = dstStride_a[0];
50 const vector unsigned char yperm = vec_lvsl(0, ysrc);
51 const int vertLumPerChroma = 2;
52 register unsigned int y;
53
54 /* This code assumes:
55 *
56 * 1) dst is 16 bytes-aligned
57 * 2) dstStride is a multiple of 16
58 * 3) width is a multiple of 16
59 * 4) lum & chrom stride are multiples of 8
60 */
61
62 for (y = 0; y < height; y++) {
63 int i;
64 for (i = 0; i < width - 31; i += 32) {
65 const unsigned int j = i >> 1;
66 vector unsigned char v_yA = vec_ld(i, ysrc);
67 vector unsigned char v_yB = vec_ld(i + 16, ysrc);
68 vector unsigned char v_yC = vec_ld(i + 32, ysrc);
69 vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
70 vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
71 vector unsigned char v_uA = vec_ld(j, usrc);
72 vector unsigned char v_uB = vec_ld(j + 16, usrc);
73 vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
74 vector unsigned char v_vA = vec_ld(j, vsrc);
75 vector unsigned char v_vB = vec_ld(j + 16, vsrc);
76 vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
77 vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
78 vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
79 vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
80 vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
81 vector unsigned char v_yuy2_2 = vec_mergeh(v_y2, v_uv_b);
82 vector unsigned char v_yuy2_3 = vec_mergel(v_y2, v_uv_b);
83 vec_st(v_yuy2_0, (i << 1), dst);
84 vec_st(v_yuy2_1, (i << 1) + 16, dst);
85 vec_st(v_yuy2_2, (i << 1) + 32, dst);
86 vec_st(v_yuy2_3, (i << 1) + 48, dst);
87 }
88 if (i < width) {
89 const unsigned int j = i >> 1;
90 vector unsigned char v_y1 = vec_ld(i, ysrc);
91 vector unsigned char v_u = vec_ld(j, usrc);
92 vector unsigned char v_v = vec_ld(j, vsrc);
93 vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
94 vector unsigned char v_yuy2_0 = vec_mergeh(v_y1, v_uv_a);
95 vector unsigned char v_yuy2_1 = vec_mergel(v_y1, v_uv_a);
96 vec_st(v_yuy2_0, (i << 1), dst);
97 vec_st(v_yuy2_1, (i << 1) + 16, dst);
98 }
99 if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
100 usrc += chromStride;
101 vsrc += chromStride;
102 }
103 ysrc += lumStride;
104 dst += dstStride;
105 }
106
107 return srcSliceH;
108 }
109
110 static int yv12touyvy_unscaled_altivec(SwsContext *c, const uint8_t *src[],
111 int srcStride[], int srcSliceY,
112 int srcSliceH, uint8_t *dstParam[],
113 int dstStride_a[])
114 {
115 uint8_t *dst = dstParam[0] + dstStride_a[0] * srcSliceY;
116 // yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH,
117 // srcStride[0], srcStride[1], dstStride[0]);
118 const uint8_t *ysrc = src[0];
119 const uint8_t *usrc = src[1];
120 const uint8_t *vsrc = src[2];
121 const int width = c->srcW;
122 const int height = srcSliceH;
123 const int lumStride = srcStride[0];
124 const int chromStride = srcStride[1];
125 const int dstStride = dstStride_a[0];
126 const int vertLumPerChroma = 2;
127 const vector unsigned char yperm = vec_lvsl(0, ysrc);
128 register unsigned int y;
129
130 /* This code assumes:
131 *
132 * 1) dst is 16 bytes-aligned
133 * 2) dstStride is a multiple of 16
134 * 3) width is a multiple of 16
135 * 4) lum & chrom stride are multiples of 8
136 */
137
138 for (y = 0; y < height; y++) {
139 int i;
140 for (i = 0; i < width - 31; i += 32) {
141 const unsigned int j = i >> 1;
142 vector unsigned char v_yA = vec_ld(i, ysrc);
143 vector unsigned char v_yB = vec_ld(i + 16, ysrc);
144 vector unsigned char v_yC = vec_ld(i + 32, ysrc);
145 vector unsigned char v_y1 = vec_perm(v_yA, v_yB, yperm);
146 vector unsigned char v_y2 = vec_perm(v_yB, v_yC, yperm);
147 vector unsigned char v_uA = vec_ld(j, usrc);
148 vector unsigned char v_uB = vec_ld(j + 16, usrc);
149 vector unsigned char v_u = vec_perm(v_uA, v_uB, vec_lvsl(j, usrc));
150 vector unsigned char v_vA = vec_ld(j, vsrc);
151 vector unsigned char v_vB = vec_ld(j + 16, vsrc);
152 vector unsigned char v_v = vec_perm(v_vA, v_vB, vec_lvsl(j, vsrc));
153 vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
154 vector unsigned char v_uv_b = vec_mergel(v_u, v_v);
155 vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
156 vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
157 vector unsigned char v_uyvy_2 = vec_mergeh(v_uv_b, v_y2);
158 vector unsigned char v_uyvy_3 = vec_mergel(v_uv_b, v_y2);
159 vec_st(v_uyvy_0, (i << 1), dst);
160 vec_st(v_uyvy_1, (i << 1) + 16, dst);
161 vec_st(v_uyvy_2, (i << 1) + 32, dst);
162 vec_st(v_uyvy_3, (i << 1) + 48, dst);
163 }
164 if (i < width) {
165 const unsigned int j = i >> 1;
166 vector unsigned char v_y1 = vec_ld(i, ysrc);
167 vector unsigned char v_u = vec_ld(j, usrc);
168 vector unsigned char v_v = vec_ld(j, vsrc);
169 vector unsigned char v_uv_a = vec_mergeh(v_u, v_v);
170 vector unsigned char v_uyvy_0 = vec_mergeh(v_uv_a, v_y1);
171 vector unsigned char v_uyvy_1 = vec_mergel(v_uv_a, v_y1);
172 vec_st(v_uyvy_0, (i << 1), dst);
173 vec_st(v_uyvy_1, (i << 1) + 16, dst);
174 }
175 if ((y & (vertLumPerChroma - 1)) == vertLumPerChroma - 1) {
176 usrc += chromStride;
177 vsrc += chromStride;
178 }
179 ysrc += lumStride;
180 dst += dstStride;
181 }
182 return srcSliceH;
183 }
184
185 #endif /* HAVE_ALTIVEC */
186
187 av_cold void ff_get_unscaled_swscale_ppc(SwsContext *c)
188 {
189 #if HAVE_ALTIVEC
190 if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
191 return;
192
193 if (!(c->srcW & 15) && !(c->flags & SWS_BITEXACT) &&
194 c->srcFormat == AV_PIX_FMT_YUV420P) {
195 enum AVPixelFormat dstFormat = c->dstFormat;
196
197 // unscaled YV12 -> packed YUV, we want speed
198 if (dstFormat == AV_PIX_FMT_YUYV422)
199 c->swscale = yv12toyuy2_unscaled_altivec;
200 else if (dstFormat == AV_PIX_FMT_UYVY422)
201 c->swscale = yv12touyvy_unscaled_altivec;
202 }
203 #endif /* HAVE_ALTIVEC */
204 }