asterisk/formats/format_jpeg.c
David Vossel c26c190711 Asterisk media architecture conversion - no more format bitfields
This patch is the foundation of an entire new way of looking at media in Asterisk.
The code present in this patch is everything required to complete phase1 of my
Media Architecture proposal.  For more information about this project visit the link below.
https://wiki.asterisk.org/wiki/display/AST/Media+Architecture+Proposal

The primary function of this patch is to convert all the usages of format
bitfields in Asterisk to use the new format and format_cap APIs.  Functionally
no change in behavior should be present in this patch.  Thanks to twilson
and russell for all the time they spent reviewing these changes.

Review: https://reviewboard.asterisk.org/r/1083/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@306010 65c4cc65-6c06-0410-ace0-fbb531ad65f3
2011-02-03 16:22:10 +00:00

120 lines
2.8 KiB
C

/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief JPEG File format support.
*
* \arg File name extension: jpeg, jpg
* \ingroup formats
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/image.h"
#include "asterisk/endian.h"
static struct ast_frame *jpeg_read_image(int fd, int len)
{
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_identify(int fd)
{
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 int jpeg_write_image(int fd, struct ast_frame *fr)
{
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 struct ast_imager jpeg_format = {
.name = "jpg",
.desc = "JPEG (Joint Picture Experts Group)",
.exts = "jpg|jpeg",
.read_image = jpeg_read_image,
.identify = jpeg_identify,
.write_image = jpeg_write_image,
};
static int load_module(void)
{
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)
{
ast_image_unregister(&jpeg_format);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "jpeg (joint picture experts group) image format",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND
);