[FFmpeg-devel] [PATCH 1/3] lavu: Add AVSphericalMapping type and frame side data

[Michael Niedermayer]

On Fri, Nov 11, 2016 at 05:49:00PM -0500, Vittorio Giovara wrote:
[...]
> +/**
> + * This structure describes how to handle spherical videos, outlining
> + * information about projection, initial layout, and any other view modifier.
> + *
> + * @note The struct must be allocated with av_spherical_alloc() and
> + *       its size is not a part of the public ABI.
> + */
> +typedef struct AVSphericalMapping {
> +    /**
> +     * Projection type.
> +     */
> +    enum AVSphericalProjection projection;
> +
> +    /**
> +     * @name Initial orientation
> +     * @{
> +     * These fields represent the pose values that measure the rotation
> +     * transformation (in degrees) to be applied to the projection.
> +     * See this equirectangular projection as example:
> +     *
> +     * @code{.unparsed}
> +     *                   Yaw
> +     *     -180           0           180
> +     *   90 +-------------+-------------+  180
> +     *      |             |             |
> +     * P    |             |      o>     |
> +     * i    |             ^             |
> +     * t  0 +-------------X-------------+    0 Roll
> +     * c    |             |             |
> +     * h    |             |             |
> +     *      |             |             |
> +     *  -90 +-------------+-------------+ -180
> +     *
> +     * X - the default camera center
> +     * ^ - the default up vector
> +     * > - the up vector for a rotation of 90 degrees
> +     * o - the image center for yaw = 90, pitch = 45, roll = 0
> +     * @endcode
> +     *
> +     * The order of transformation is always yaw, followed by pitch, and
> +     * finally by roll.
> +     */

> +    double yaw;   ///< Clockwise rotation around the up vector [-180, 180].
> +    double pitch; ///< Counter-clockwise rotation around the right vector [-90, 90].
> +    double roll;  ///< Counter-clockwise rotation around the forward vector [-180, 180].

please use intXY (64 or 32 as preferred) so there are no platform
rounding dependancies


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The misfortune of the wise is better than the prosperity of the fool.
-- Epicurus
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