Mon Mar 19 11:30:47 2012

Asterisk developer's documentation


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"

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_framejpeg_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 = "88eaa8f5c1bd988bedd71113385e0886" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static struct ast_module_infoast_module_info = &__mod_info
static struct ast_imager jpeg_format


Detailed Description

JPEG File format support.

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.

00063 {
00064    char buf[10];
00065    int res;
00066    res = read(fd, buf, sizeof(buf));
00067    if (res < sizeof(buf))
00068       return 0;
00069    if (memcmp(buf + 6, "JFIF", 4))
00070       return 0;
00071    return 1;
00072 }

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

Definition at line 40 of file format_jpeg.c.

References AST_FORMAT_JPEG, AST_FRAME_IMAGE, ast_frisolate(), ast_log(), errno, and LOG_WARNING.

00041 {
00042    struct ast_frame fr;
00043    int res;
00044    char buf[65536];
00045    if (len > sizeof(buf) || len < 0) {
00046       ast_log(LOG_WARNING, "JPEG image too large to read\n");
00047       return NULL;
00048    }
00049    res = read(fd, buf, len);
00050    if (res < len) {
00051       ast_log(LOG_WARNING, "Only read %d of %d bytes: %s\n", res, len, strerror(errno));
00052    }
00053    memset(&fr, 0, sizeof(fr));
00054    fr.frametype = AST_FRAME_IMAGE;
00055    fr.subclass.codec = AST_FORMAT_JPEG;
00056    fr.data.ptr = buf;
00057    fr.src = "JPEG Read";
00058    fr.datalen = len;
00059    return ast_frisolate(&fr);
00060 }

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_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_frame::frametype, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.

00075 {
00076    int res=0;
00077    if (fr->frametype != AST_FRAME_IMAGE) {
00078       ast_log(LOG_WARNING, "Not an image\n");
00079       return -1;
00080    }
00081    if (fr->subclass.codec != AST_FORMAT_JPEG) {
00082       ast_log(LOG_WARNING, "Not a jpeg image\n");
00083       return -1;
00084    }
00085    if (fr->datalen) {
00086       res = write(fd, fr->data.ptr, fr->datalen);
00087       if (res != fr->datalen) {
00088          ast_log(LOG_WARNING, "Only wrote %d of %d bytes: %s\n", res, fr->datalen, strerror(errno));
00089          return -1;
00090       }
00091    }
00092    return res;
00093 }

static int load_module ( void   )  [static]

Definition at line 105 of file format_jpeg.c.

References ast_image_register(), AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and jpeg_format.

00106 {
00107    if (ast_image_register(&jpeg_format))
00108       return AST_MODULE_LOAD_FAILURE;
00109    return AST_MODULE_LOAD_SUCCESS;
00110 }

static int unload_module ( void   )  [static]

Definition at line 112 of file format_jpeg.c.

References ast_image_unregister(), and jpeg_format.

00113 {
00114    ast_image_unregister(&jpeg_format);
00115 
00116    return 0;
00117 }


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 = "88eaa8f5c1bd988bedd71113385e0886" , .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.

Referenced by load_module(), and unload_module().


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