avpicture: Suppress warning from deprecated code
[libav.git] / libavcodec / imgconvert.c
1 /*
2 * Misc image conversion routines
3 * Copyright (c) 2001, 2002, 2003 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * misc image conversion routines
25 */
26
27 /* TODO:
28 * - write 'ffimg' program to test all the image related stuff
29 * - move all api to slice based system
30 * - integrate deinterlacing, postprocessing and scaling in the conversion process
31 */
32
33 #include "avcodec.h"
34 #include "imgconvert.h"
35 #include "internal.h"
36 #include "mathops.h"
37 #include "libavutil/colorspace.h"
38 #include "libavutil/common.h"
39 #include "libavutil/pixdesc.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/imgutils.h"
42
43 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
44 {
45 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
46 *h_shift = desc->log2_chroma_w;
47 *v_shift = desc->log2_chroma_h;
48 }
49
50 static int is_gray(const AVPixFmtDescriptor *desc)
51 {
52 return desc->nb_components - (desc->flags & AV_PIX_FMT_FLAG_ALPHA) == 1;
53 }
54
55 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
56 enum AVPixelFormat src_pix_fmt,
57 int has_alpha)
58 {
59 const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
60 const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
61 int loss, i, nb_components = FFMIN(src_desc->nb_components,
62 dst_desc->nb_components);
63
64 /* compute loss */
65 loss = 0;
66
67 if (dst_pix_fmt == src_pix_fmt)
68 return 0;
69
70 for (i = 0; i < nb_components; i++)
71 if (src_desc->comp[i].depth > dst_desc->comp[i].depth)
72 loss |= FF_LOSS_DEPTH;
73
74 if (dst_desc->log2_chroma_w > src_desc->log2_chroma_w ||
75 dst_desc->log2_chroma_h > src_desc->log2_chroma_h)
76 loss |= FF_LOSS_RESOLUTION;
77
78 if ((src_desc->flags & AV_PIX_FMT_FLAG_RGB) != (dst_desc->flags & AV_PIX_FMT_FLAG_RGB))
79 loss |= FF_LOSS_COLORSPACE;
80
81 if (has_alpha && !(dst_desc->flags & AV_PIX_FMT_FLAG_ALPHA) &&
82 (src_desc->flags & AV_PIX_FMT_FLAG_ALPHA))
83 loss |= FF_LOSS_ALPHA;
84
85 if (dst_pix_fmt == AV_PIX_FMT_PAL8 && !is_gray(src_desc))
86 return loss | FF_LOSS_COLORQUANT;
87
88 if (src_desc->nb_components > dst_desc->nb_components)
89 if (is_gray(dst_desc))
90 loss |= FF_LOSS_CHROMA;
91
92 return loss;
93 }
94
95 static enum AVPixelFormat avcodec_find_best_pix_fmt1(enum AVPixelFormat *pix_fmt_list,
96 enum AVPixelFormat src_pix_fmt,
97 int has_alpha,
98 int loss_mask)
99 {
100 int dist, i, loss, min_dist;
101 enum AVPixelFormat dst_pix_fmt;
102
103 /* find exact color match with smallest size */
104 dst_pix_fmt = AV_PIX_FMT_NONE;
105 min_dist = 0x7fffffff;
106 i = 0;
107 while (pix_fmt_list[i] != AV_PIX_FMT_NONE) {
108 enum AVPixelFormat pix_fmt = pix_fmt_list[i];
109
110 if (i > AV_PIX_FMT_NB) {
111 av_log(NULL, AV_LOG_ERROR, "Pixel format list longer than expected, "
112 "it is either not properly terminated or contains duplicates\n");
113 return AV_PIX_FMT_NONE;
114 }
115
116 loss = avcodec_get_pix_fmt_loss(pix_fmt, src_pix_fmt, has_alpha) & loss_mask;
117 if (loss == 0) {
118 dist = av_get_bits_per_pixel(av_pix_fmt_desc_get(pix_fmt));
119 if (dist < min_dist) {
120 min_dist = dist;
121 dst_pix_fmt = pix_fmt;
122 }
123 }
124 i++;
125 }
126 return dst_pix_fmt;
127 }
128
129 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
130 enum AVPixelFormat src_pix_fmt,
131 int has_alpha, int *loss_ptr)
132 {
133 enum AVPixelFormat dst_pix_fmt;
134 int loss_mask, i;
135 static const int loss_mask_order[] = {
136 ~0, /* no loss first */
137 ~FF_LOSS_ALPHA,
138 ~FF_LOSS_RESOLUTION,
139 ~(FF_LOSS_COLORSPACE | FF_LOSS_RESOLUTION),
140 ~FF_LOSS_COLORQUANT,
141 ~FF_LOSS_DEPTH,
142 0,
143 };
144
145 /* try with successive loss */
146 i = 0;
147 for(;;) {
148 loss_mask = loss_mask_order[i++];
149 dst_pix_fmt = avcodec_find_best_pix_fmt1(pix_fmt_list, src_pix_fmt,
150 has_alpha, loss_mask);
151 if (dst_pix_fmt >= 0)
152 goto found;
153 if (loss_mask == 0)
154 break;
155 }
156 return AV_PIX_FMT_NONE;
157 found:
158 if (loss_ptr)
159 *loss_ptr = avcodec_get_pix_fmt_loss(dst_pix_fmt, src_pix_fmt, has_alpha);
160 return dst_pix_fmt;
161 }
162
163 /* 2x2 -> 1x1 */
164 void ff_shrink22(uint8_t *dst, int dst_wrap,
165 const uint8_t *src, int src_wrap,
166 int width, int height)
167 {
168 int w;
169 const uint8_t *s1, *s2;
170 uint8_t *d;
171
172 for(;height > 0; height--) {
173 s1 = src;
174 s2 = s1 + src_wrap;
175 d = dst;
176 for(w = width;w >= 4; w-=4) {
177 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
178 d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
179 d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
180 d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
181 s1 += 8;
182 s2 += 8;
183 d += 4;
184 }
185 for(;w > 0; w--) {
186 d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
187 s1 += 2;
188 s2 += 2;
189 d++;
190 }
191 src += 2 * src_wrap;
192 dst += dst_wrap;
193 }
194 }
195
196 /* 4x4 -> 1x1 */
197 void ff_shrink44(uint8_t *dst, int dst_wrap,
198 const uint8_t *src, int src_wrap,
199 int width, int height)
200 {
201 int w;
202 const uint8_t *s1, *s2, *s3, *s4;
203 uint8_t *d;
204
205 for(;height > 0; height--) {
206 s1 = src;
207 s2 = s1 + src_wrap;
208 s3 = s2 + src_wrap;
209 s4 = s3 + src_wrap;
210 d = dst;
211 for(w = width;w > 0; w--) {
212 d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
213 s2[0] + s2[1] + s2[2] + s2[3] +
214 s3[0] + s3[1] + s3[2] + s3[3] +
215 s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
216 s1 += 4;
217 s2 += 4;
218 s3 += 4;
219 s4 += 4;
220 d++;
221 }
222 src += 4 * src_wrap;
223 dst += dst_wrap;
224 }
225 }
226
227 /* 8x8 -> 1x1 */
228 void ff_shrink88(uint8_t *dst, int dst_wrap,
229 const uint8_t *src, int src_wrap,
230 int width, int height)
231 {
232 int w, i;
233
234 for(;height > 0; height--) {
235 for(w = width;w > 0; w--) {
236 int tmp=0;
237 for(i=0; i<8; i++){
238 tmp += src[0] + src[1] + src[2] + src[3] + src[4] + src[5] + src[6] + src[7];
239 src += src_wrap;
240 }
241 *(dst++) = (tmp + 32)>>6;
242 src += 8 - 8*src_wrap;
243 }
244 src += 8*src_wrap - 8*width;
245 dst += dst_wrap - width;
246 }
247 }
248
249 /* return true if yuv planar */
250 static inline int is_yuv_planar(const AVPixFmtDescriptor *desc)
251 {
252 return (!(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
253 (desc->flags & AV_PIX_FMT_FLAG_PLANAR));
254 }
255
256 #if FF_API_AVPICTURE
257 FF_DISABLE_DEPRECATION_WARNINGS
258
259 int av_picture_crop(AVPicture *dst, const AVPicture *src,
260 enum AVPixelFormat pix_fmt, int top_band, int left_band)
261 {
262 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
263 int y_shift;
264 int x_shift;
265
266 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB || !is_yuv_planar(desc))
267 return -1;
268
269 y_shift = desc->log2_chroma_h;
270 x_shift = desc->log2_chroma_w;
271
272 dst->data[0] = src->data[0] + (top_band * src->linesize[0]) + left_band;
273 dst->data[1] = src->data[1] + ((top_band >> y_shift) * src->linesize[1]) + (left_band >> x_shift);
274 dst->data[2] = src->data[2] + ((top_band >> y_shift) * src->linesize[2]) + (left_band >> x_shift);
275
276 dst->linesize[0] = src->linesize[0];
277 dst->linesize[1] = src->linesize[1];
278 dst->linesize[2] = src->linesize[2];
279 return 0;
280 }
281
282 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width,
283 enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright,
284 int *color)
285 {
286 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
287 uint8_t *optr;
288 int y_shift;
289 int x_shift;
290 int yheight;
291 int i, y;
292
293 if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB ||
294 !is_yuv_planar(desc)) return -1;
295
296 for (i = 0; i < 3; i++) {
297 x_shift = i ? desc->log2_chroma_w : 0;
298 y_shift = i ? desc->log2_chroma_h : 0;
299
300 if (padtop || padleft) {
301 memset(dst->data[i], color[i],
302 dst->linesize[i] * (padtop >> y_shift) + (padleft >> x_shift));
303 }
304
305 if (padleft || padright) {
306 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
307 (dst->linesize[i] - (padright >> x_shift));
308 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
309 for (y = 0; y < yheight; y++) {
310 memset(optr, color[i], (padleft + padright) >> x_shift);
311 optr += dst->linesize[i];
312 }
313 }
314
315 if (src) { /* first line */
316 uint8_t *iptr = src->data[i];
317 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
318 (padleft >> x_shift);
319 memcpy(optr, iptr, (width - padleft - padright) >> x_shift);
320 iptr += src->linesize[i];
321 optr = dst->data[i] + dst->linesize[i] * (padtop >> y_shift) +
322 (dst->linesize[i] - (padright >> x_shift));
323 yheight = (height - 1 - (padtop + padbottom)) >> y_shift;
324 for (y = 0; y < yheight; y++) {
325 memset(optr, color[i], (padleft + padright) >> x_shift);
326 memcpy(optr + ((padleft + padright) >> x_shift), iptr,
327 (width - padleft - padright) >> x_shift);
328 iptr += src->linesize[i];
329 optr += dst->linesize[i];
330 }
331 }
332
333 if (padbottom || padright) {
334 optr = dst->data[i] + dst->linesize[i] *
335 ((height - padbottom) >> y_shift) - (padright >> x_shift);
336 memset(optr, color[i],dst->linesize[i] *
337 (padbottom >> y_shift) + (padright >> x_shift));
338 }
339 }
340 return 0;
341 }
342
343 FF_DISABLE_DEPRECATION_WARNINGS
344 #endif /* FF_API_AVPICTURE */