include/asterisk/image.h

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2006, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  * \brief General Asterisk channel definitions for image handling
  21  */
  22
  23 #ifndef _ASTERISK_IMAGE_H
  24 #define _ASTERISK_IMAGE_H
  25
  26 /*! \brief structure associated with registering an image format */
  27 struct ast_imager {
  28         /*! Name */
  29         char *name;
  30         /*! Description */
  31         char *desc;
  32         /*! Extension(s) (separated by '|' ) */
  33         char *exts;
  34         /*! Image format */
  35         int format;
  36         /*! Read an image from a file descriptor */
  37         struct ast_frame *(*read_image)(int fd, int len);
  38         /*! Identify if this is that type of file */
  39         int (*identify)(int fd);
  40         /*! Returns length written */
  41         int (*write_image)(int fd, struct ast_frame *frame);
  42         /*! For linked list */
  43         AST_LIST_ENTRY(ast_imager) list;
  44 };
  45
  46 /*! Check for image support on a channel */
  47 /*!
  48  * \param chan channel to check
  49  * Checks the channel to see if it supports the transmission of images
  50  * Returns non-zero if image transmission is supported
  51  */
  52 int ast_supports_images(struct ast_channel *chan);
  53
  54 /*! Sends an image */
  55 /*!
  56  * \param chan channel to send image on
  57  * \param filename filename of image to send (minus extension)
  58  * Sends an image on the given channel.
  59  * Returns 0 on success, -1 on error
  60  */
  61 int ast_send_image(struct ast_channel *chan, char *filename);
  62
  63 /*! Make an image */
  64 /*!
  65  * \param filename filename of image to prepare
  66  * \param preflang preferred language to get the image...?
  67  * \param format the format of the file
  68  * Make an image from a filename ??? No estoy positivo
  69  * Returns an ast_frame on success, NULL on failure
  70  */
  71 struct ast_frame *ast_read_image(char *filename, const char *preflang, int format);
  72
  73 /*! Register image format */
  74 /*!
  75  * \param imgdrv Populated ast_imager structure with info to register
  76  * Registers an image format
  77  * Returns 0 regardless
  78  */
  79 int ast_image_register(struct ast_imager *imgdrv);
  80
  81 /*! Unregister an image format */
  82 /*!
  83  * \param imgdrv pointer to the ast_imager structure you wish to unregister
  84  * Unregisters the image format passed in
  85  * Returns nothing
  86  */
  87 void ast_image_unregister(struct ast_imager *imgdrv);
  88
  89 /*! Initialize image stuff */
  90 /*!
  91  * Initializes all the various image stuff.  Basically just registers the cli stuff
  92  * Returns 0 all the time
  93  */
  94 int ast_image_init(void);
  95
  96 #endif /* _ASTERISK_IMAGE_H */