Wed Jan 8 2020 09:50:12

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 = "ac1f6a56484a8820659555499174e588" , .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.

  • 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.

63 {
64  char buf[10];
65  int res;
66  res = read(fd, buf, sizeof(buf));
67  if (res < sizeof(buf))
68  return 0;
69  if (memcmp(buf + 6, "JFIF", 4))
70  return 0;
71  return 1;
72 }
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(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_frame::frametype, len(), LOG_WARNING, ast_frame::ptr, ast_frame::src, and ast_frame::subclass.

41 {
42  struct ast_frame fr;
43  int res;
44  char buf[65536];
45  if (len > sizeof(buf) || len < 0) {
46  ast_log(LOG_WARNING, "JPEG image too large to read\n");
47  return NULL;
48  }
49  res = read(fd, buf, len);
50  if (res < len) {
51  ast_log(LOG_WARNING, "Only read %d of %d bytes: %s\n", res, len, strerror(errno));
52  }
53  memset(&fr, 0, sizeof(fr));
54  fr.frametype = AST_FRAME_IMAGE;
55  fr.subclass.codec = AST_FORMAT_JPEG;
56  fr.data.ptr = buf;
57  fr.src = "JPEG Read";
58  fr.datalen = len;
59  return ast_frisolate(&fr);
60 }
#define LOG_WARNING
Definition: logger.h:144
struct ast_frame * ast_frisolate(struct ast_frame *fr)
Makes a frame independent of any static storage.
Definition: frame.c:391
#define AST_FORMAT_JPEG
Definition: frame.h:276
static int len(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
void ast_log(int level, const char *file, int line, const char *function, const char *fmt,...)
Used for sending a log message This is the standard logger function. Probably the only way you will i...
Definition: logger.c:1207
int errno
Data structure associated with a single frame of data.
Definition: frame.h:142
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.

75 {
76  int res=0;
77  if (fr->frametype != AST_FRAME_IMAGE) {
78  ast_log(LOG_WARNING, "Not an image\n");
79  return -1;
80  }
81  if (fr->subclass.codec != AST_FORMAT_JPEG) {
82  ast_log(LOG_WARNING, "Not a jpeg image\n");
83  return -1;
84  }
85  if (fr->datalen) {
86  res = write(fd, fr->data.ptr, fr->datalen);
87  if (res != fr->datalen) {
88  ast_log(LOG_WARNING, "Only wrote %d of %d bytes: %s\n", res, fr->datalen, strerror(errno));
89  return -1;
90  }
91  }
92  return res;
93 }
union ast_frame_subclass subclass
Definition: frame.h:146
void * ptr
Definition: frame.h:160
#define LOG_WARNING
Definition: logger.h:144
format_t codec
Definition: frame.h:137
int datalen
Definition: frame.h:148
#define AST_FORMAT_JPEG
Definition: frame.h:276
void ast_log(int level, const char *file, int line, const char *function, const char *fmt,...)
Used for sending a log message This is the standard logger function. Probably the only way you will i...
Definition: logger.c:1207
int errno
enum ast_frame_type frametype
Definition: frame.h:144
union ast_frame::@172 data
static int load_module ( void  )
static

Definition at line 105 of file format_jpeg.c.

References ast_image_register(), AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

106 {
110 }
static struct ast_imager jpeg_format
Definition: format_jpeg.c:95
int ast_image_register(struct ast_imager *imgdrv)
Register image format.
Definition: image.c:50
static int unload_module ( void  )
static

Definition at line 112 of file format_jpeg.c.

References ast_image_unregister().

113 {
115 
116  return 0;
117 }
static struct ast_imager jpeg_format
Definition: format_jpeg.c:95
void ast_image_unregister(struct ast_imager *imgdrv)
Unregister an image format.
Definition: image.c:59

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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static

Definition at line 123 of file format_jpeg.c.

Definition at line 123 of file format_jpeg.c.

struct ast_imager jpeg_format
static

Definition at line 95 of file format_jpeg.c.