diff options
Diffstat (limited to 'media/ffvpx/libavutil/display.h')
| -rw-r--r-- | media/ffvpx/libavutil/display.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/display.h b/media/ffvpx/libavutil/display.h index 39c15ee6b..515adad79 100644 --- a/media/ffvpx/libavutil/display.h +++ b/media/ffvpx/libavutil/display.h @@ -18,6 +18,11 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +/** + * @file + * Display matrix + */ + #ifndef AVUTIL_DISPLAY_H #define AVUTIL_DISPLAY_H @@ -25,15 +30,26 @@ #include "common.h" /** + * @addtogroup lavu_video + * @{ + * + * @defgroup lavu_video_display Display transformation matrix functions + * @{ + */ + +/** + * @addtogroup lavu_video_display * The display transformation matrix specifies an affine transformation that * should be applied to video frames for correct presentation. It is compatible * with the matrices stored in the ISO/IEC 14496-12 container format. * * The data is a 3x3 matrix represented as a 9-element array: * + * @code{.unparsed} * | a b u | * (a, b, u, c, d, v, x, y, w) -> | c d v | * | x y w | + * @endcode * * All numbers are stored in native endianness, as 16.16 fixed-point values, * except for u, v and w, which are stored as 2.30 fixed-point values. @@ -41,15 +57,21 @@ * The transformation maps a point (p, q) in the source (pre-transformation) * frame to the point (p', q') in the destination (post-transformation) frame as * follows: + * + * @code{.unparsed} * | a b u | * (p, q, 1) . | c d v | = z * (p', q', 1) * | x y w | + * @endcode * * The transformation can also be more explicitly written in components as * follows: + * + * @code{.unparsed} * p' = (a * p + c * q + x) / z; * q' = (b * p + d * q + y) / z; * z = u * p + v * q + w + * @endcode */ /** @@ -84,4 +106,9 @@ void av_display_rotation_set(int32_t matrix[9], double angle); */ void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip); +/** + * @} + * @} + */ + #endif /* AVUTIL_DISPLAY_H */ |