124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief JPEG File format support.
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*
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* \arg File name extension: jpeg, jpg
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* \ingroup formats
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*/
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/*** MODULEINFO
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<support_level>extended</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/mod_format.h"
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#include "asterisk/module.h"
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#include "asterisk/image.h"
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#include "asterisk/endian.h"
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static struct ast_frame *jpeg_read_image(int fd, int len)
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{
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struct ast_frame fr;
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int res;
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char buf[65536];
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if (len > sizeof(buf) || len < 0) {
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ast_log(LOG_WARNING, "JPEG image too large to read\n");
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return NULL;
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}
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res = read(fd, buf, len);
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if (res < len) {
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ast_log(LOG_WARNING, "Only read %d of %d bytes: %s\n", res, len, strerror(errno));
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}
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memset(&fr, 0, sizeof(fr));
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fr.frametype = AST_FRAME_IMAGE;
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ast_format_set(&fr.subclass.format, AST_FORMAT_JPEG, 0);
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fr.data.ptr = buf;
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fr.src = "JPEG Read";
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fr.datalen = len;
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return ast_frisolate(&fr);
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}
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static int jpeg_identify(int fd)
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{
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char buf[10];
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int res;
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res = read(fd, buf, sizeof(buf));
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if (res < sizeof(buf))
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return 0;
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if (memcmp(buf + 6, "JFIF", 4))
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return 0;
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return 1;
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}
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static int jpeg_write_image(int fd, struct ast_frame *fr)
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{
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int res=0;
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if (fr->frametype != AST_FRAME_IMAGE) {
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ast_log(LOG_WARNING, "Not an image\n");
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return -1;
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}
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if (fr->subclass.format.id != AST_FORMAT_JPEG) {
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ast_log(LOG_WARNING, "Not a jpeg image\n");
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return -1;
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}
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if (fr->datalen) {
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res = write(fd, fr->data.ptr, fr->datalen);
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if (res != fr->datalen) {
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ast_log(LOG_WARNING, "Only wrote %d of %d bytes: %s\n", res, fr->datalen, strerror(errno));
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return -1;
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}
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}
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return res;
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}
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static struct ast_imager jpeg_format = {
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.name = "jpg",
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.desc = "JPEG (Joint Picture Experts Group)",
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.exts = "jpg|jpeg",
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.read_image = jpeg_read_image,
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.identify = jpeg_identify,
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.write_image = jpeg_write_image,
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};
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static int load_module(void)
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{
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ast_format_set(&jpeg_format.format, AST_FORMAT_JPEG, 0);
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if (ast_image_register(&jpeg_format))
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return AST_MODULE_LOAD_FAILURE;
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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ast_image_unregister(&jpeg_format);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "jpeg (joint picture experts group) image format",
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND
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);
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