127 lines
2.3 KiB
C
Executable File
127 lines
2.3 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* JPEG File format support.
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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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
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*/
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#include <asterisk/channel.h>
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#include <asterisk/file.h>
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#include <asterisk/logger.h>
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#include <asterisk/sched.h>
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#include <asterisk/module.h>
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#include <asterisk/image.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <pthread.h>
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#include <endian.h>
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static char *desc = "JPEG (Joint Picture Experts Group) Image Format";
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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)) {
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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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fr.subclass = AST_FORMAT_JPEG;
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fr.data = 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 != 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, 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);
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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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"jpg",
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"JPEG (Joint Picture Experts Group)",
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"jpg|jpeg",
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AST_FORMAT_JPEG,
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jpeg_read_image,
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jpeg_identify,
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jpeg_write_image,
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};
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int load_module()
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{
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return ast_image_register(&jpeg_format);
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}
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int unload_module()
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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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int usecount()
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{
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/* We never really have any users */
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return 0;
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}
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char *description()
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{
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return desc;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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