JPEG File format support. More...

#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/image.h"
#include "asterisk/endian.h"

Include dependency graph for format_jpeg.c:

Go to the source code of this file.

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static int	jpeg_identify (int fd)
static struct ast_frame *	jpeg_read_image (int fd, int len)
static int	jpeg_write_image (int fd, struct ast_frame *fr)
static int	load_module (void)
static int	unload_module (void)
Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "jpeg (joint picture experts group) image format" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_imager	jpeg_format

Detailed Description

JPEG File format support.

File name extension: jpeg, jpg

Definition in file format_jpeg.c.

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 123 of file format_jpeg.c.

static void __unreg_module ( void ) [static]

Definition at line 123 of file format_jpeg.c.

static int jpeg_identify ( int fd ) [static]

Definition at line 62 of file format_jpeg.c.

{
   char buf[10];
   int res;
   res = read(fd, buf, sizeof(buf));
   if (res < sizeof(buf))
      return 0;
   if (memcmp(buf + 6, "JFIF", 4))
      return 0;
   return 1;
}

static struct ast_frame* jpeg_read_image	(	int	fd,
		int	len
	)		`[static, read]`

Definition at line 40 of file format_jpeg.c.

References AST_FORMAT_JPEG, ast_format_set(), AST_FRAME_IMAGE, ast_frisolate(), ast_log(), ast_frame::data, ast_frame::datalen, errno, ast_frame_subclass::format, ast_frame::frametype, len(), LOG_WARNING, ast_frame::ptr, ast_frame::src, and ast_frame::subclass.

{
   struct ast_frame fr;
   int res;
   char buf[65536];
   if (len > sizeof(buf) || len < 0) {
      ast_log(LOG_WARNING, "JPEG image too large to read\n");
      return NULL;
   }
   res = read(fd, buf, len);
   if (res < len) {
      ast_log(LOG_WARNING, "Only read %d of %d bytes: %s\n", res, len, strerror(errno));
   }
   memset(&fr, 0, sizeof(fr));
   fr.frametype = AST_FRAME_IMAGE;
   ast_format_set(&fr.subclass.format, AST_FORMAT_JPEG, 0);
   fr.data.ptr = buf;
   fr.src = "JPEG Read";
   fr.datalen = len;
   return ast_frisolate(&fr);
}

static int jpeg_write_image	(	int	fd,
		struct ast_frame *	fr
	)		`[static]`

Definition at line 74 of file format_jpeg.c.

References AST_FORMAT_JPEG, AST_FRAME_IMAGE, ast_log(), ast_frame::data, ast_frame::datalen, errno, ast_frame_subclass::format, ast_frame::frametype, ast_format::id, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.

{
   int res=0;
   if (fr->frametype != AST_FRAME_IMAGE) {
      ast_log(LOG_WARNING, "Not an image\n");
      return -1;
   }
   if (fr->subclass.format.id != AST_FORMAT_JPEG) {
      ast_log(LOG_WARNING, "Not a jpeg image\n");
      return -1;
   }
   if (fr->datalen) {
      res = write(fd, fr->data.ptr, fr->datalen);
      if (res != fr->datalen) {
         ast_log(LOG_WARNING, "Only wrote %d of %d bytes: %s\n", res, fr->datalen, strerror(errno));
         return -1;
      }
   }
   return res;
}

static int load_module ( void ) [static]

Definition at line 104 of file format_jpeg.c.

References AST_FORMAT_JPEG, ast_format_set(), ast_image_register(), AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and ast_imager::format.

{
   ast_format_set(&jpeg_format.format, AST_FORMAT_JPEG, 0);
   if (ast_image_register(&jpeg_format))
      return AST_MODULE_LOAD_FAILURE;
   return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module ( void ) [static]

Definition at line 112 of file format_jpeg.c.

References ast_image_unregister().

{
   ast_image_unregister(&jpeg_format);

   return 0;
}

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "jpeg (joint picture experts group) image format" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 123 of file format_jpeg.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 123 of file format_jpeg.c.

struct ast_imager jpeg_format [static]

Definition at line 95 of file format_jpeg.c.

Asterisk developer's documentation

Functions

Variables

Detailed Description

Function Documentation

Variable Documentation