FFmpeg
display.c
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1 /*
2  * Copyright (c) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
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 "libavutil/display.c"
23 
24 static void print_matrix(int32_t matrix[9])
25 {
26  int i, j;
27 
28  for (i = 0; i < 3; ++i) {
29  for (j = 0; j < 3 - 1; ++j)
30  printf("%d ", matrix[i*3 + j]);
31 
32  printf("%d\n", matrix[i*3 + j]);
33  }
34 }
35 
36 int main(void)
37 {
38  int32_t matrix[9];
39 
40  // Set the matrix to 90 degrees
43  printf("degrees: %f\n", av_display_rotation_get(matrix));
44 
45  // Set the matrix to -45 degrees
48  printf("degrees: %f\n", av_display_rotation_get(matrix));
49 
50  // flip horizontal
53  printf("degrees: %f\n", av_display_rotation_get(matrix));
54 
55  // flip vertical
58  printf("degrees: %f\n", av_display_rotation_get(matrix));
59 
60  return 0;
61 
62 }
matrix
Definition: vc1dsp.c:42
av_display_matrix_flip
void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip)
Flip the input matrix horizontally and/or vertically.
Definition: display.c:66
av_display_rotation_set
void av_display_rotation_set(int32_t matrix[9], double angle)
Initialize a transformation matrix describing a pure clockwise rotation by the specified angle (in de...
Definition: display.c:51
print_matrix
static void print_matrix(int32_t matrix[9])
Definition: display.c:24
printf
printf("static const uint8_t my_array[100] = {\n")
display.c
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:245
main
int main(void)
Definition: display.c:36
int32_t
int32_t
Definition: audioconvert.c:56
av_display_rotation_get
double av_display_rotation_get(const int32_t matrix[9])
Extract the rotation component of the transformation matrix.
Definition: display.c:35