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/*
* Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* @ingroup lavu_video_stereo3d
* Stereoscopic video
*/
#ifndef AVUTIL_STEREO3D_H
#define AVUTIL_STEREO3D_H
#include <stdint.h>
#include "frame.h"
/**
* @defgroup lavu_video_stereo3d Stereo3D types and functions
* @ingroup lavu_video
*
* A stereoscopic video file consists in multiple views embedded in a single
* frame, usually describing two views of a scene. This file describes all
* possible codec-independent view arrangements.
*
* @{
*/
/**
* List of possible 3D Types
*/
enum AVStereo3DType {
/**
* Video is not stereoscopic (and metadata has to be there).
*/
AV_STEREO3D_2D,
/**
* Views are next to each other.
*
* @code{.unparsed}
* LLLLRRRR
* LLLLRRRR
* LLLLRRRR
* ...
* @endcode
*/
AV_STEREO3D_SIDEBYSIDE,
/**
* Views are on top of each other.
*
* @code{.unparsed}
* LLLLLLLL
* LLLLLLLL
* RRRRRRRR
* RRRRRRRR
* @endcode
*/
AV_STEREO3D_TOPBOTTOM,
/**
* Views are alternated temporally.
*
* @code{.unparsed}
* frame0 frame1 frame2 ...
* LLLLLLLL RRRRRRRR LLLLLLLL
* LLLLLLLL RRRRRRRR LLLLLLLL
* LLLLLLLL RRRRRRRR LLLLLLLL
* ... ... ...
* @endcode
*/
AV_STEREO3D_FRAMESEQUENCE,
/**
* Views are packed in a checkerboard-like structure per pixel.
*
* @code{.unparsed}
* LRLRLRLR
* RLRLRLRL
* LRLRLRLR
* ...
* @endcode
*/
AV_STEREO3D_CHECKERBOARD,
/**
* Views are next to each other, but when upscaling
* apply a checkerboard pattern.
*
* @code{.unparsed}
* LLLLRRRR L L L L R R R R
* LLLLRRRR => L L L L R R R R
* LLLLRRRR L L L L R R R R
* LLLLRRRR L L L L R R R R
* @endcode
*/
AV_STEREO3D_SIDEBYSIDE_QUINCUNX,
/**
* Views are packed per line, as if interlaced.
*
* @code{.unparsed}
* LLLLLLLL
* RRRRRRRR
* LLLLLLLL
* ...
* @endcode
*/
AV_STEREO3D_LINES,
/**
* Views are packed per column.
*
* @code{.unparsed}
* LRLRLRLR
* LRLRLRLR
* LRLRLRLR
* ...
* @endcode
*/
AV_STEREO3D_COLUMNS,
};
/**
* List of possible view types.
*/
enum AVStereo3DView {
/**
* Frame contains two packed views.
*/
AV_STEREO3D_VIEW_PACKED,
/**
* Frame contains only the left view.
*/
AV_STEREO3D_VIEW_LEFT,
/**
* Frame contains only the right view.
*/
AV_STEREO3D_VIEW_RIGHT,
};
/**
* Inverted views, Right/Bottom represents the left view.
*/
#define AV_STEREO3D_FLAG_INVERT (1 << 0)
/**
* Stereo 3D type: this structure describes how two videos are packed
* within a single video surface, with additional information as needed.
*
* @note The struct must be allocated with av_stereo3d_alloc() and
* its size is not a part of the public ABI.
*/
typedef struct AVStereo3D {
/**
* How views are packed within the video.
*/
enum AVStereo3DType type;
/**
* Additional information about the frame packing.
*/
int flags;
/**
* Determines which views are packed.
*/
enum AVStereo3DView view;
} AVStereo3D;
/**
* Allocate an AVStereo3D structure and set its fields to default values.
* The resulting struct can be freed using av_freep().
*
* @return An AVStereo3D filled with default values or NULL on failure.
*/
AVStereo3D *av_stereo3d_alloc(void);
/**
* Allocate a complete AVFrameSideData and add it to the frame.
*
* @param frame The frame which side data is added to.
*
* @return The AVStereo3D structure to be filled by caller.
*/
AVStereo3D *av_stereo3d_create_side_data(AVFrame *frame);
/**
* Provide a human-readable name of a given stereo3d type.
*
* @param type The input stereo3d type value.
*
* @return The name of the stereo3d value, or "unknown".
*/
const char *av_stereo3d_type_name(unsigned int type);
/**
* Get the AVStereo3DType form a human-readable name.
*
* @param name The input string.
*
* @return The AVStereo3DType value, or -1 if not found.
*/
int av_stereo3d_from_name(const char *name);
/**
* @}
*/
#endif /* AVUTIL_STEREO3D_H */
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