format_jpeg.c File Reference

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 __MODULE_INFO_SECTION	__mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "jpeg (joint picture experts group) image format" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, }
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 119 of file format_jpeg.c.

static void __unreg_module

(

void

)

[static]

Definition at line 119 of file format_jpeg.c.

static int jpeg_identify

(

int

fd

)

[static]

Definition at line 58 of file format_jpeg.c.

References buf.

{
   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 36 of file format_jpeg.c.

References AST_FORMAT_JPEG, AST_FRAME_IMAGE, ast_frisolate(), ast_log(), buf, ast_frame::data, ast_frame::datalen, errno, 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;
   fr.subclass = AST_FORMAT_JPEG;
   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 70 of file format_jpeg.c.

References AST_FORMAT_JPEG, AST_FRAME_IMAGE, ast_log(), ast_frame::data, ast_frame::datalen, errno, ast_frame::frametype, 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 != 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 101 of file format_jpeg.c.

References ast_image_register(), AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

{
   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 108 of file format_jpeg.c.

References ast_image_unregister().

{
   ast_image_unregister(&jpeg_format);

   return 0;
}  

---

Variable Documentation

struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "jpeg (joint picture experts group) image format" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, } [static]

Definition at line 119 of file format_jpeg.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 119 of file format_jpeg.c.

struct ast_imager jpeg_format [static]

Definition at line 91 of file format_jpeg.c.