9bb661e27c0c6bf4e20702948605c386f96602ad
[libav.git] / libswscale / swscale-example.c
1 /*
2 * Copyright (C) 2003 Michael Niedermayer <michaelni@gmx.at>
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 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <inttypes.h>
25 #include <stdarg.h>
26
27 #undef HAVE_AV_CONFIG_H
28 #include "libavutil/avutil.h"
29 #include "libavutil/lfg.h"
30 #include "swscale.h"
31
32 /* HACK Duplicated from swscale_internal.h.
33 * Should be removed when a cleaner pixel format system exists. */
34 const char *sws_format_name(enum PixelFormat format);
35 #define isGray(x) ( \
36 (x)==PIX_FMT_GRAY8 \
37 || (x)==PIX_FMT_GRAY16BE \
38 || (x)==PIX_FMT_GRAY16LE \
39 )
40 #define hasChroma(x) (!( \
41 isGray(x) \
42 || (x)==PIX_FMT_MONOBLACK \
43 || (x)==PIX_FMT_MONOWHITE \
44 ))
45 #define isALPHA(x) ( \
46 (x)==PIX_FMT_BGR32 \
47 || (x)==PIX_FMT_BGR32_1 \
48 || (x)==PIX_FMT_RGB32 \
49 || (x)==PIX_FMT_RGB32_1 \
50 || (x)==PIX_FMT_YUVA420P \
51 )
52
53 static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, int w, int h)
54 {
55 int x,y;
56 uint64_t ssd=0;
57
58 //printf("%d %d\n", w, h);
59
60 for (y=0; y<h; y++) {
61 for (x=0; x<w; x++) {
62 int d= src1[x + y*stride1] - src2[x + y*stride2];
63 ssd+= d*d;
64 //printf("%d", abs(src1[x + y*stride1] - src2[x + y*stride2])/26 );
65 }
66 //printf("\n");
67 }
68 return ssd;
69 }
70
71 // test by ref -> src -> dst -> out & compare out against ref
72 // ref & out are YV12
73 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h,
74 enum PixelFormat srcFormat, enum PixelFormat dstFormat,
75 int srcW, int srcH, int dstW, int dstH, int flags)
76 {
77 uint8_t *src[4] = {0};
78 uint8_t *dst[4] = {0};
79 uint8_t *out[4] = {0};
80 int srcStride[4], dstStride[4];
81 int i;
82 uint64_t ssdY, ssdU=0, ssdV=0, ssdA=0;
83 struct SwsContext *srcContext = NULL, *dstContext = NULL,
84 *outContext = NULL;
85 int res;
86
87 res = 0;
88 for (i=0; i<4; i++) {
89 // avoid stride % bpp != 0
90 if (srcFormat==PIX_FMT_RGB24 || srcFormat==PIX_FMT_BGR24)
91 srcStride[i]= srcW*3;
92 else if (srcFormat==PIX_FMT_RGB48BE || srcFormat==PIX_FMT_RGB48LE)
93 srcStride[i]= srcW*6;
94 else
95 srcStride[i]= srcW*4;
96
97 if (dstFormat==PIX_FMT_RGB24 || dstFormat==PIX_FMT_BGR24)
98 dstStride[i]= dstW*3;
99 else if (dstFormat==PIX_FMT_RGB48BE || dstFormat==PIX_FMT_RGB48LE)
100 dstStride[i]= dstW*6;
101 else
102 dstStride[i]= dstW*4;
103
104 src[i]= malloc(srcStride[i]*srcH);
105 dst[i]= malloc(dstStride[i]*dstH);
106 out[i]= malloc(refStride[i]*h);
107 if (!src[i] || !dst[i] || !out[i]) {
108 perror("Malloc");
109 res = -1;
110
111 goto end;
112 }
113 }
114
115 srcContext= sws_getContext(w, h, PIX_FMT_YUVA420P, srcW, srcH, srcFormat, flags, NULL, NULL, NULL);
116 if (!srcContext) {
117 fprintf(stderr, "Failed to get %s ---> %s\n",
118 sws_format_name(PIX_FMT_YUVA420P),
119 sws_format_name(srcFormat));
120 res = -1;
121
122 goto end;
123 }
124 dstContext= sws_getContext(srcW, srcH, srcFormat, dstW, dstH, dstFormat, flags, NULL, NULL, NULL);
125 if (!dstContext) {
126 fprintf(stderr, "Failed to get %s ---> %s\n",
127 sws_format_name(srcFormat),
128 sws_format_name(dstFormat));
129 res = -1;
130
131 goto end;
132 }
133 outContext= sws_getContext(dstW, dstH, dstFormat, w, h, PIX_FMT_YUVA420P, flags, NULL, NULL, NULL);
134 if (!outContext) {
135 fprintf(stderr, "Failed to get %s ---> %s\n",
136 sws_format_name(dstFormat),
137 sws_format_name(PIX_FMT_YUVA420P));
138 res = -1;
139
140 goto end;
141 }
142 // printf("test %X %X %X -> %X %X %X\n", (int)ref[0], (int)ref[1], (int)ref[2],
143 // (int)src[0], (int)src[1], (int)src[2]);
144
145 sws_scale(srcContext, ref, refStride, 0, h , src, srcStride);
146 sws_scale(dstContext, src, srcStride, 0, srcH, dst, dstStride);
147 sws_scale(outContext, dst, dstStride, 0, dstH, out, refStride);
148
149 ssdY= getSSD(ref[0], out[0], refStride[0], refStride[0], w, h);
150 if (hasChroma(srcFormat) && hasChroma(dstFormat)) {
151 //FIXME check that output is really gray
152 ssdU= getSSD(ref[1], out[1], refStride[1], refStride[1], (w+1)>>1, (h+1)>>1);
153 ssdV= getSSD(ref[2], out[2], refStride[2], refStride[2], (w+1)>>1, (h+1)>>1);
154 }
155 if (isALPHA(srcFormat) && isALPHA(dstFormat))
156 ssdA= getSSD(ref[3], out[3], refStride[3], refStride[3], w, h);
157
158 ssdY/= w*h;
159 ssdU/= w*h/4;
160 ssdV/= w*h/4;
161 ssdA/= w*h;
162
163 printf(" %s %dx%d -> %s %4dx%4d flags=%2d SSD=%5"PRId64",%5"PRId64",%5"PRId64",%5"PRId64"\n",
164 sws_format_name(srcFormat), srcW, srcH,
165 sws_format_name(dstFormat), dstW, dstH,
166 flags, ssdY, ssdU, ssdV, ssdA);
167 fflush(stdout);
168
169 end:
170
171 sws_freeContext(srcContext);
172 sws_freeContext(dstContext);
173 sws_freeContext(outContext);
174
175 for (i=0; i<4; i++) {
176 free(src[i]);
177 free(dst[i]);
178 free(out[i]);
179 }
180
181 return res;
182 }
183
184 static void selfTest(uint8_t *ref[4], int refStride[4], int w, int h)
185 {
186 const int flags[] = { SWS_FAST_BILINEAR,
187 SWS_BILINEAR, SWS_BICUBIC,
188 SWS_X , SWS_POINT , SWS_AREA, 0 };
189 const int srcW = w;
190 const int srcH = h;
191 const int dstW[] = { srcW - srcW/3, srcW, srcW + srcW/3, 0 };
192 const int dstH[] = { srcH - srcH/3, srcH, srcH + srcH/3, 0 };
193 enum PixelFormat srcFormat, dstFormat;
194
195 for (srcFormat = 0; srcFormat < PIX_FMT_NB; srcFormat++) {
196 for (dstFormat = 0; dstFormat < PIX_FMT_NB; dstFormat++) {
197 int i, j, k;
198 int res = 0;
199
200 printf("%s -> %s\n",
201 sws_format_name(srcFormat),
202 sws_format_name(dstFormat));
203 fflush(stdout);
204
205 for (i = 0; dstW[i] && !res; i++)
206 for (j = 0; dstH[j] && !res; j++)
207 for (k = 0; flags[k] && !res; k++)
208 res = doTest(ref, refStride, w, h, srcFormat, dstFormat,
209 srcW, srcH, dstW[i], dstH[j], flags[k]);
210 }
211 }
212 }
213
214 #define W 96
215 #define H 96
216
217 int main(int argc, char **argv)
218 {
219 uint8_t *rgb_data = malloc (W*H*4);
220 uint8_t *rgb_src[3]= {rgb_data, NULL, NULL};
221 int rgb_stride[3]={4*W, 0, 0};
222 uint8_t *data = malloc (4*W*H);
223 uint8_t *src[4]= {data, data+W*H, data+W*H*2, data+W*H*3};
224 int stride[4]={W, W, W, W};
225 int x, y;
226 struct SwsContext *sws;
227 AVLFG rand;
228
229 if (!rgb_data || !data)
230 return -1;
231
232 sws= sws_getContext(W/12, H/12, PIX_FMT_RGB32, W, H, PIX_FMT_YUVA420P, SWS_BILINEAR, NULL, NULL, NULL);
233
234 av_lfg_init(&rand, 1);
235
236 for (y=0; y<H; y++) {
237 for (x=0; x<W*4; x++) {
238 rgb_data[ x + y*4*W]= av_lfg_get(&rand);
239 }
240 }
241 sws_scale(sws, rgb_src, rgb_stride, 0, H, src, stride);
242 sws_freeContext(sws);
243 free(rgb_data);
244
245 selfTest(src, stride, W, H);
246 free(data);
247
248 return 0;
249 }