34 double av_display_rotation_get(const int32_t matrix[9])  in av_display_rotation_get()
38     scale[0] = hypot(CONV_FP(matrix[0]), CONV_FP(matrix[3]));  in av_display_rotation_get()
39     scale[1] = hypot(CONV_FP(matrix[1]), CONV_FP(matrix[4]));  in av_display_rotation_get()
44     rotation = atan2(CONV_FP(matrix[1]) / scale[1],  in av_display_rotation_get()
45                      CONV_FP(matrix[0]) / scale[0]) * 180 / M_PI;  in av_display_rotation_get()
50 void av_display_rotation_set(int32_t matrix[9], double angle)  in av_display_rotation_set()
56     memset(matrix, 0, 9 * sizeof(int32_t));  in av_display_rotation_set()
58     matrix[0] = CONV_DB(c);  in av_display_rotation_set()
59     matrix[1] = CONV_DB(-s);  in av_display_rotation_set()
60     matrix[3] = CONV_DB(s);  in av_display_rotation_set()
61     matrix[4] = CONV_DB(c);  in av_display_rotation_set()
62     matrix[8] = 1 << 30;  in av_display_rotation_set()
65 void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip)  in av_display_matrix_flip()
72             matrix[i] *= flip[i % 3];  in av_display_matrix_flip()