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yuv2rgb_bfin.c
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1 /*
2  * Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com>
3  *
4  * Blackfin video color space converter operations
5  * convert I420 YV12 to RGB in various formats
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 "libavutil/pixdesc.h"
25 #include <stdint.h>
26 
27 #include "config.h"
28 #include "libavutil/attributes.h"
29 #include "libavutil/bfin/attributes.h"
30 #include "libswscale/swscale_internal.h"
31 
32 void ff_bfin_yuv2rgb555_line(const uint8_t *Y, const uint8_t *U,
33  const uint8_t *V, uint8_t *out,
34  int w, uint32_t *coeffs) attribute_l1_text;
35 
36 void ff_bfin_yuv2rgb565_line(const uint8_t *Y, const uint8_t *U,
37  const uint8_t *V, uint8_t *out,
38  int w, uint32_t *coeffs) attribute_l1_text;
39 
40 void ff_bfin_yuv2rgb24_line(const uint8_t *Y, const uint8_t *U,
41  const uint8_t *V, uint8_t *out,
42  int w, uint32_t *coeffs) attribute_l1_text;
43 
44 typedef void (*ltransform)(const uint8_t *Y, const uint8_t *U, const uint8_t *V,
45  uint8_t *out, int w, uint32_t *coeffs);
46 
47 static void bfin_prepare_coefficients(SwsContext *c, int rgb, int masks)
48 {
49  int oy;
50  oy = c->yOffset & 0xffff;
51  oy = oy >> 3; // keep everything U8.0 for offset calculation
52 
53  c->oc = 128 * 0x01010101U;
54  c->oy = oy * 0x01010101U;
55 
56  /* copy 64bit vector coeffs down to 32bit vector coeffs */
57  c->cy = c->yCoeff;
58  c->zero = 0;
59 
60  if (rgb) {
61  c->crv = c->vrCoeff;
62  c->cbu = c->ubCoeff;
63  c->cgu = c->ugCoeff;
64  c->cgv = c->vgCoeff;
65  } else {
66  c->crv = c->ubCoeff;
67  c->cbu = c->vrCoeff;
68  c->cgu = c->vgCoeff;
69  c->cgv = c->ugCoeff;
70  }
71 
72  if (masks == 555) {
73  c->rmask = 0x001f * 0x00010001U;
74  c->gmask = 0x03e0 * 0x00010001U;
75  c->bmask = 0x7c00 * 0x00010001U;
76  } else if (masks == 565) {
77  c->rmask = 0x001f * 0x00010001U;
78  c->gmask = 0x07e0 * 0x00010001U;
79  c->bmask = 0xf800 * 0x00010001U;
80  }
81 }
82 
83 static int core_yuv420_rgb(SwsContext *c, const uint8_t **in, int *instrides,
84  int srcSliceY, int srcSliceH, uint8_t **oplanes,
85  int *outstrides, ltransform lcscf,
86  int rgb, int masks)
87 {
88  const uint8_t *py, *pu, *pv;
89  uint8_t *op;
90  int w = instrides[0];
91  int h2 = srcSliceH >> 1;
92  int i;
93 
94  bfin_prepare_coefficients(c, rgb, masks);
95 
96  py = in[0];
97  pu = in[1 + (1 ^ rgb)];
98  pv = in[1 + (0 ^ rgb)];
99 
100  op = oplanes[0] + srcSliceY * outstrides[0];
101 
102  for (i = 0; i < h2; i++) {
103  lcscf(py, pu, pv, op, w, &c->oy);
104 
105  py += instrides[0];
106  op += outstrides[0];
107 
108  lcscf(py, pu, pv, op, w, &c->oy);
109 
110  py += instrides[0];
111  pu += instrides[1];
112  pv += instrides[2];
113  op += outstrides[0];
114  }
115 
116  return srcSliceH;
117 }
118 
119 static int bfin_yuv420_rgb555(SwsContext *c, const uint8_t **in, int *instrides,
120  int srcSliceY, int srcSliceH,
121  uint8_t **oplanes, int *outstrides)
122 {
123  return core_yuv420_rgb(c, in, instrides, srcSliceY, srcSliceH, oplanes,
124  outstrides, ff_bfin_yuv2rgb555_line, 1, 555);
125 }
126 
127 static int bfin_yuv420_bgr555(SwsContext *c, const uint8_t **in, int *instrides,
128  int srcSliceY, int srcSliceH,
129  uint8_t **oplanes, int *outstrides)
130 {
131  return core_yuv420_rgb(c, in, instrides, srcSliceY, srcSliceH, oplanes,
132  outstrides, ff_bfin_yuv2rgb555_line, 0, 555);
133 }
134 
135 static int bfin_yuv420_rgb24(SwsContext *c, const uint8_t **in, int *instrides,
136  int srcSliceY, int srcSliceH,
137  uint8_t **oplanes, int *outstrides)
138 {
139  return core_yuv420_rgb(c, in, instrides, srcSliceY, srcSliceH, oplanes,
140  outstrides, ff_bfin_yuv2rgb24_line, 1, 888);
141 }
142 
143 static int bfin_yuv420_bgr24(SwsContext *c, const uint8_t **in, int *instrides,
144  int srcSliceY, int srcSliceH,
145  uint8_t **oplanes, int *outstrides)
146 {
147  return core_yuv420_rgb(c, in, instrides, srcSliceY, srcSliceH, oplanes,
148  outstrides, ff_bfin_yuv2rgb24_line, 0, 888);
149 }
150 
151 static int bfin_yuv420_rgb565(SwsContext *c, const uint8_t **in, int *instrides,
152  int srcSliceY, int srcSliceH,
153  uint8_t **oplanes, int *outstrides)
154 {
155  return core_yuv420_rgb(c, in, instrides, srcSliceY, srcSliceH, oplanes,
156  outstrides, ff_bfin_yuv2rgb565_line, 1, 565);
157 }
158 
159 static int bfin_yuv420_bgr565(SwsContext *c, const uint8_t **in, int *instrides,
160  int srcSliceY, int srcSliceH,
161  uint8_t **oplanes, int *outstrides)
162 {
163  return core_yuv420_rgb(c, in, instrides, srcSliceY, srcSliceH, oplanes,
164  outstrides, ff_bfin_yuv2rgb565_line, 0, 565);
165 }
166 
167 av_cold SwsFunc ff_yuv2rgb_init_bfin(SwsContext *c)
168 {
169  SwsFunc f;
170 
171  switch (c->dstFormat) {
172  case AV_PIX_FMT_RGB555:
173  f = bfin_yuv420_rgb555;
174  break;
175  case AV_PIX_FMT_BGR555:
176  f = bfin_yuv420_bgr555;
177  break;
178  case AV_PIX_FMT_RGB565:
179  f = bfin_yuv420_rgb565;
180  break;
181  case AV_PIX_FMT_BGR565:
182  f = bfin_yuv420_bgr565;
183  break;
184  case AV_PIX_FMT_RGB24:
185  f = bfin_yuv420_rgb24;
186  break;
187  case AV_PIX_FMT_BGR24:
188  f = bfin_yuv420_bgr24;
189  break;
190  default:
191  return 0;
192  }
193 
194  av_log(c, AV_LOG_INFO, "BlackFin accelerated color space converter %s\n",
195  av_get_pix_fmt_name(c->dstFormat));
196 
197  return f;
198 }
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