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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
* \brief General Asterisk channel definitions for image handling
*/
#ifndef _ASTERISK_IMAGE_H
#define _ASTERISK_IMAGE_H
/*! \brief structure associated with registering an image format */
struct ast_imager {
char *name; /*!< Name */
char *desc; /*!< Description */
char *exts; /*!< Extension(s) (separated by '|' ) */
int format; /*!< Image format */
struct ast_frame *(*read_image)(int fd, int len); /*!< Read an image from a file descriptor */
int (*identify)(int fd); /*!< Identify if this is that type of file */
int (*write_image)(int fd, struct ast_frame *frame); /*!< Returns length written */
AST_LIST_ENTRY(ast_imager) list; /*!< For linked list */
};
/*!
* \brief Check for image support on a channel
* \param chan channel to check
* Checks the channel to see if it supports the transmission of images
* \return non-zero if image transmission is supported
*/
int ast_supports_images(struct ast_channel *chan);
/*!
* \brief Sends an image
* \param chan channel to send image on
* \param filename filename of image to send (minus extension)
* Sends an image on the given channel.
* \retval 0 on success
* \retval -1 on error
*/
int ast_send_image(struct ast_channel *chan, char *filename);
/*!
* \brief Make an image
* \param filename filename of image to prepare
* \param preflang preferred language to get the image...?
* \param format the format of the file
* Make an image from a filename ??? No estoy positivo
* \retval an ast_frame on success
* \retval NULL on failure
*/
struct ast_frame *ast_read_image(char *filename, const char *preflang, int format);
/*!
* \brief Register image format
* \param imgdrv Populated ast_imager structure with info to register
* Registers an image format
* \return 0 regardless
*/
int ast_image_register(struct ast_imager *imgdrv);
/*!
* \brief Unregister an image format
* \param imgdrv pointer to the ast_imager structure you wish to unregister
* Unregisters the image format passed in.
* Returns nothing
*/
void ast_image_unregister(struct ast_imager *imgdrv);
/*!
* \brief Initialize image stuff
* Initializes all the various image stuff. Basically just registers the cli stuff
* \return 0 all the time
*/
int ast_image_init(void);
#endif /* _ASTERISK_IMAGE_H */
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