/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */

#ifndef SPA_VIDEO_MULTIVIEW_H
#define SPA_VIDEO_MULTIVIEW_H

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \addtogroup spa_param
 * \{
 */

/**
 * All possible stereoscopic 3D and multiview representations.
 * In conjunction with \ref spa_video_multiview_flags, describes how
 * multiview content is being transported in the stream.
 */
enum spa_video_multiview_mode {
    /** A special value indicating no multiview information. Used in spa_video_info and other
     * places to indicate that no specific multiview handling has been requested or provided.
     * This value is never carried on caps. */
    SPA_VIDEO_MULTIVIEW_MODE_NONE = -1,
    SPA_VIDEO_MULTIVIEW_MODE_MONO = 0,        /**< All frames are monoscopic */
    /* Single view modes */
    SPA_VIDEO_MULTIVIEW_MODE_LEFT,            /**< All frames represent a left-eye view */
    SPA_VIDEO_MULTIVIEW_MODE_RIGHT,            /**< All frames represent a right-eye view */
    /* Stereo view modes */
    SPA_VIDEO_MULTIVIEW_MODE_SIDE_BY_SIDE,        /**< Left and right eye views are provided
                             *   in the left and right half of the frame
                             *   respectively. */
    SPA_VIDEO_MULTIVIEW_MODE_SIDE_BY_SIDE_QUINCUNX, /**< Left and right eye views are provided
                             *   in the left and right half of the
                             *   frame, but have been sampled using
                             *   quincunx method, with half-pixel offset
                             *   between the 2 views. */
    SPA_VIDEO_MULTIVIEW_MODE_COLUMN_INTERLEAVED,    /**< Alternating vertical columns of pixels
                             *   represent the left and right eye view
                             *   respectively. */
    SPA_VIDEO_MULTIVIEW_MODE_ROW_INTERLEAVED,    /**< Alternating horizontal rows of pixels
                             *   represent the left and right eye view
                             *   respectively. */
    SPA_VIDEO_MULTIVIEW_MODE_TOP_BOTTOM,        /**< The top half of the frame contains the
                             *   left eye, and the bottom half the right
                             *   eye. */
    SPA_VIDEO_MULTIVIEW_MODE_CHECKERBOARD,        /**< Pixels are arranged with alternating
                             *   pixels representing left and right eye
                             *   views in a checkerboard fashion. */
    /* Padding for new frame packing modes */

    SPA_VIDEO_MULTIVIEW_MODE_FRAME_BY_FRAME = 32,    /**< Left and right eye views are provided
                             *   in separate frames alternately. */
    /* Multiview mode(s) */
    SPA_VIDEO_MULTIVIEW_MODE_MULTIVIEW_FRAME_BY_FRAME, /**< Multipleindependent views are
                                *   provided in separate frames in
                                *   sequence. This method only applies to
                                *   raw video buffers at the moment.
                                *   Specific view identification is via
                                *   metadata on raw video buffers. */
    SPA_VIDEO_MULTIVIEW_MODE_SEPARATED,        /**< Multiple views are provided as separate
                             *   \ref spa_data framebuffers attached
                             *   to each \ref spa_buffer, described
                             *   by the metadata */
    /* future expansion for annotated modes */
};

/**
 * spa_video_multiview_flags are used to indicate extra properties of a
 * stereo/multiview stream beyond the frame layout and buffer mapping
 * that is conveyed in the \ref spa_video_multiview_mode.
 */
enum spa_video_multiview_flags {
    SPA_VIDEO_MULTIVIEW_FLAGS_NONE = 0,            /**< No flags */
    SPA_VIDEO_MULTIVIEW_FLAGS_RIGHT_VIEW_FIRST = (1 << 0),    /**< For stereo streams, the normal arrangement
                                 *   of left and right views is reversed */
    SPA_VIDEO_MULTIVIEW_FLAGS_LEFT_FLIPPED = (1 << 1),    /**< The left view is vertically mirrored */
    SPA_VIDEO_MULTIVIEW_FLAGS_LEFT_FLOPPED = (1 << 2),    /**< The left view is horizontally mirrored */
    SPA_VIDEO_MULTIVIEW_FLAGS_RIGHT_FLIPPED = (1 << 3),    /**< The right view is vertically mirrored */
    SPA_VIDEO_MULTIVIEW_FLAGS_RIGHT_FLOPPED = (1 << 4),    /**< The right view is horizontally mirrored */
    SPA_VIDEO_MULTIVIEW_FLAGS_HALF_ASPECT = (1 << 14),    /**< For frame-packed multiview
                                 *   modes, indicates that the individual
                                 *   views have been encoded with half the true
                                 *   width or height and should be scaled back
                                 *   up for display. This flag is used for
                                 *   overriding input layout interpretation
                                 *   by adjusting pixel-aspect-ratio.
                                 *   For side-by-side, column interleaved or
                                 *   checkerboard packings, the
                                 *   pixel width will be doubled.
                                 *   For row interleaved and
                                 *   top-bottom encodings, pixel height will
                                 *   be doubled */
    SPA_VIDEO_MULTIVIEW_FLAGS_MIXED_MONO = (1 << 15),    /**< The video stream contains both
                                 *   mono and multiview portions,
                                 *   signalled on each buffer by the
                                 *   absence or presence of a buffer flag. */
};


/**
 * \}
 */

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* SPA_VIDEO_MULTIVIEW_H */