freeswitch/src/include/switch_core_video.h

/*
 * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 * Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 *
 * The Initial Developer of the Original Code is
 * Seven Du <dujinfang@gmail.com>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 *
 * switch_core_video.h -- Core Video header
 *
 */
/*! \file switch_core_video.h
	\brief video includes header

	The things powered by libvpx are renamed into the switch_ namespace to provide a cleaner
	look to things and helps me to document what parts of video I am using I'd like to take this
	opportunity to thank libvpx for all the awesome stuff it does and for making my life much easier.

*/
#ifndef SWITCH_VIDEO_H
#define SWITCH_VIDEO_H

#include "vpx/vpx_image.h"
#include "vpx/vpx_integer.h"

SWITCH_BEGIN_EXTERN_C

#define SWITCH_IMG_FMT_PLANAR    VPX_IMG_FMT_PLANAR
#define SWITCH_IMG_FMT_UV_FLIP   VPX_IMG_FMT_UV_FLIP
#define SWITCH_IMG_FMT_HAS_ALPHA VPX_IMG_FMT_HAS_ALPHA


#define SWITCH_PLANE_PACKED VPX_PLANE_PACKED
#define SWITCH_PLANE_Y      VPX_PLANE_Y
#define SWITCH_PLANE_U      VPX_PLANE_U
#define SWITCH_PLANE_V      VPX_PLANE_V
#define SWITCH_PLANE_ALPHA  VPX_PLANE_ALPHA

#ifndef VPX_IMG_FMT_HIGH         /* not available in libvpx 1.3.0 (see commit hash e97aea28) */
#define VPX_IMG_FMT_HIGH         0x800  /**< Image uses 16bit framebuffer */
#endif

#define SWITCH_IMG_FMT_HIGH      VPX_IMG_FMT_HIGH
#define SWITCH_IMG_FMT_I420	     VPX_IMG_FMT_I420

typedef vpx_img_fmt_t switch_img_fmt_t;

typedef vpx_image_t switch_image_t;

/**\brief Representation of a rectangle on a surface */
typedef struct switch_image_rect {
	unsigned int x; /**< leftmost column */
	unsigned int y; /**< topmost row */
	unsigned int w; /**< width */
	unsigned int h; /**< height */
} switch_image_rect_t;

/*!\brief Open a descriptor, allocating storage for the underlying image
*
* Returns a descriptor for storing an image of the given format. The
* storage for the descriptor is allocated on the heap.
*
* \param[in]    img       Pointer to storage for descriptor. If this parameter
*                         is NULL, the storage for the descriptor will be
*                         allocated on the heap.
* \param[in]    fmt       Format for the image
* \param[in]    d_w       Width of the image
* \param[in]    d_h       Height of the image
* \param[in]    align     Alignment, in bytes, of the image buffer and
*                         each row in the image(stride).
*
* \return Returns a pointer to the initialized image descriptor. If the img
*         parameter is non-null, the value of the img parameter will be
*         returned.
*/
SWITCH_DECLARE(switch_image_t *)switch_img_alloc(switch_image_t  *img,
						 switch_img_fmt_t fmt,
						 unsigned int d_w,
						 unsigned int d_h,
						 unsigned int align);

/*!\brief Open a descriptor, using existing storage for the underlying image
*
* Returns a descriptor for storing an image of the given format. The
* storage for descriptor has been allocated elsewhere, and a descriptor is
* desired to "wrap" that storage.
*
* \param[in]    img       Pointer to storage for descriptor. If this parameter
*                         is NULL, the storage for the descriptor will be
*                         allocated on the heap.
* \param[in]    fmt       Format for the image
* \param[in]    d_w       Width of the image
* \param[in]    d_h       Height of the image
* \param[in]    align     Alignment, in bytes, of each row in the image.
* \param[in]    img_data  Storage to use for the image
*
* \return Returns a pointer to the initialized image descriptor. If the img
*         parameter is non-null, the value of the img parameter will be
*         returned.
*/
SWITCH_DECLARE(switch_image_t *)switch_img_wrap(switch_image_t  *img,
						switch_img_fmt_t fmt,
						unsigned int d_w,
						unsigned int d_h,
						unsigned int align,
						unsigned char      *img_data);


/*!\brief Set the rectangle identifying the displayed portion of the image
*
* Updates the displayed rectangle (aka viewport) on the image surface to
* match the specified coordinates and size.
*
* \param[in]    img       Image descriptor
* \param[in]    x         leftmost column
* \param[in]    y         topmost row
* \param[in]    w         width
* \param[in]    h         height
*
* \return 0 if the requested rectangle is valid, nonzero otherwise.
*/
SWITCH_DECLARE(int) switch_img_set_rect(switch_image_t  *img,
				   unsigned int  x,
				   unsigned int  y,
				   unsigned int  w,
				   unsigned int  h);


SWITCH_DECLARE(void) switch_img_patch(switch_image_t *IMG, switch_image_t *img, int x, int y);

/*!\brief Copy image to a new image
*
* if new_img is NULL, a new image is allocated
* if new_img is not NULL but not the same size as img,
*    new_img is destroyed and a new new_img is allocated
* else, copy the img data to the new_img
*
* \param[in]    img       Image descriptor
*/

SWITCH_DECLARE(void) switch_img_copy(switch_image_t *img, switch_image_t **new_img);


/*!\brief Flip the image vertically (top for bottom)
*
* Adjusts the image descriptor's pointers and strides to make the image
* be referenced upside-down.
*
* \param[in]    img       Image descriptor
*/
SWITCH_DECLARE(void) switch_img_flip(switch_image_t *img);

/*!\brief Close an image descriptor
*
* Frees all allocated storage associated with an image descriptor.
*
* \param[in]    img       pointer to pointer of Image descriptor
*/
SWITCH_DECLARE(void) switch_img_free(switch_image_t **img);

SWITCH_DECLARE(void) switch_img_add_text(void *buffer, int w, int x, int y, char *s);

/** @} */

SWITCH_END_EXTERN_C
#endif
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