282 lines
6.6 KiB
C
282 lines
6.6 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 Save to raw, headerless h263 data.
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* \arg File name extension: h263
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* \ingroup formats
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*/
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#include <unistd.h>
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#include <netinet/in.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 <errno.h>
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#include <string.h>
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/lock.h"
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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/endian.h"
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/* Some Ideas for this code came from makeh263e.c by Jeffrey Chilton */
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/* Portions of the conversion code are by guido@sienanet.it */
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struct ast_filestream {
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void *reserved[AST_RESERVED_POINTERS];
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/* Believe it or not, we must decode/recode to account for the
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weird MS format */
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/* This is what a filestream means to us */
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FILE *f; /* Descriptor */
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unsigned int lastts;
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struct ast_frame fr; /* Frame information */
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char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
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char empty; /* Empty character */
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unsigned char h263[4096]; /* Two Real h263 Frames */
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};
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AST_MUTEX_DEFINE_STATIC(h263_lock);
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static int glistcnt = 0;
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static char *name = "h263";
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static char *desc = "Raw h263 data";
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static char *exts = "h263";
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static struct ast_filestream *h263_open(FILE *f)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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unsigned int ts;
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int res;
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if ((res = fread(&ts, 1, sizeof(ts), f)) < sizeof(ts)) {
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ast_log(LOG_WARNING, "Empty file!\n");
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return NULL;
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}
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&h263_lock)) {
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ast_log(LOG_WARNING, "Unable to lock h263 list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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tmp->fr.data = tmp->h263;
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tmp->fr.frametype = AST_FRAME_VIDEO;
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tmp->fr.subclass = AST_FORMAT_H263;
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/* datalen will vary for each frame */
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tmp->fr.src = name;
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tmp->fr.mallocd = 0;
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glistcnt++;
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ast_mutex_unlock(&h263_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *h263_rewrite(FILE *f, const char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&h263_lock)) {
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ast_log(LOG_WARNING, "Unable to lock h263 list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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glistcnt++;
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ast_mutex_unlock(&h263_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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static void h263_close(struct ast_filestream *s)
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{
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if (ast_mutex_lock(&h263_lock)) {
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ast_log(LOG_WARNING, "Unable to lock h263 list\n");
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return;
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}
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glistcnt--;
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ast_mutex_unlock(&h263_lock);
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ast_update_use_count();
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fclose(s->f);
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free(s);
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s = NULL;
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}
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static struct ast_frame *h263_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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int mark=0;
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unsigned short len;
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unsigned int ts;
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/* Send a frame from the file to the appropriate channel */
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s->fr.frametype = AST_FRAME_VIDEO;
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s->fr.subclass = AST_FORMAT_H263;
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s->fr.offset = AST_FRIENDLY_OFFSET;
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s->fr.mallocd = 0;
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s->fr.data = s->h263;
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if ((res = fread(&len, 1, sizeof(len), s->f)) < 1) {
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return NULL;
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}
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len = ntohs(len);
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if (len & 0x8000) {
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mark = 1;
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}
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len &= 0x7fff;
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if (len > sizeof(s->h263)) {
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ast_log(LOG_WARNING, "Length %d is too long\n", len);
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}
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if ((res = fread(s->h263, 1, len, s->f)) != len) {
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if (res)
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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}
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s->fr.samples = s->lastts;
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s->fr.datalen = len;
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s->fr.subclass |= mark;
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s->fr.delivery.tv_sec = 0;
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s->fr.delivery.tv_usec = 0;
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if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
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s->lastts = ntohl(ts);
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*whennext = s->lastts * 4/45;
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} else
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*whennext = 0;
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return &s->fr;
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}
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static int h263_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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unsigned int ts;
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unsigned short len;
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int subclass;
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int mark=0;
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if (f->frametype != AST_FRAME_VIDEO) {
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ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
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return -1;
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}
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subclass = f->subclass;
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if (subclass & 0x1)
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mark=0x8000;
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subclass &= ~0x1;
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if (subclass != AST_FORMAT_H263) {
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ast_log(LOG_WARNING, "Asked to write non-h263 frame (%d)!\n", f->subclass);
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return -1;
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}
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ts = htonl(f->samples);
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if ((res = fwrite(&ts, 1, sizeof(ts), fs->f)) != sizeof(ts)) {
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ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
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return -1;
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}
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len = htons(f->datalen | mark);
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if ((res = fwrite(&len, 1, sizeof(len), fs->f)) != sizeof(len)) {
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ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
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return -1;
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}
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if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
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return -1;
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}
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return 0;
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}
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static char *h263_getcomment(struct ast_filestream *s)
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{
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return NULL;
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}
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static int h263_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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/* No way Jose */
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return -1;
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}
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static int h263_trunc(struct ast_filestream *fs)
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{
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/* Truncate file to current length */
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if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
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return -1;
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return 0;
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}
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static off_t h263_tell(struct ast_filestream *fs)
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{
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/* XXX This is totally bogus XXX */
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off_t offset;
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offset = ftello(fs->f);
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return (offset/20)*160;
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}
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int load_module()
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{
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return ast_format_register(name, exts, AST_FORMAT_H263,
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h263_open,
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h263_rewrite,
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h263_write,
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h263_seek,
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h263_trunc,
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h263_tell,
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h263_read,
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h263_close,
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h263_getcomment);
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}
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int unload_module()
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{
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return ast_format_unregister(name);
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}
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int usecount()
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{
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return glistcnt;
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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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