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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, 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 Save to raw, headerless h263 data.
* \arg File name extension: h263
* \ingroup formats
* \arg See \ref AstVideo
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision: 364580 $")
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
/* Some Ideas for this code came from makeh263e.c by Jeffrey Chilton */
/* Portions of the conversion code are by guido@sienanet.it */
/* According to:
* http://lists.mpegif.org/pipermail/mp4-tech/2005-July/005741.html
* the maximum actual frame size is not 2048, but 8192. Since the maximum
* theoretical limit is not much larger (32k = 15bits), we'll go for that
* size to ensure we don't corrupt frames sent to us (unless they're
* ridiculously large). */
#define BUF_SIZE 32768 /* Four real h.263 Frames */
struct h263_desc {
unsigned int lastts;
};
static int h263_open(struct ast_filestream *s)
{
unsigned int ts;
if (fread(&ts, 1, sizeof(ts), s->f) < sizeof(ts)) {
ast_log(LOG_WARNING, "Empty file!\n");
return -1;
}
return 0;
}
static struct ast_frame *h263_read(struct ast_filestream *s, int *whennext)
{
int res;
uint32_t mark;
unsigned short len;
unsigned int ts;
struct h263_desc *fs = (struct h263_desc *)s->_private;
/* Send a frame from the file to the appropriate channel */
if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
return NULL;
len = ntohs(len);
mark = (len & 0x8000) ? 1 : 0;
len &= 0x7fff;
if (len > BUF_SIZE) {
ast_log(LOG_WARNING, "Length %d is too long\n", len);
return NULL;
}
s->fr.frametype = AST_FRAME_VIDEO;
ast_format_set(&s->fr.subclass.format, AST_FORMAT_H263, 0);
s->fr.mallocd = 0;
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
return NULL;
}
s->fr.samples = fs->lastts; /* XXX what ? */
s->fr.datalen = len;
if (mark) {
ast_format_set_video_mark(&s->fr.subclass.format);
}
s->fr.delivery.tv_sec = 0;
s->fr.delivery.tv_usec = 0;
if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
fs->lastts = ntohl(ts);
*whennext = fs->lastts * 4/45;
} else
*whennext = 0;
return &s->fr;
}
static int h263_write(struct ast_filestream *fs, struct ast_frame *f)
{
int res;
unsigned int ts;
unsigned short len;
uint32_t mark = 0;
if (f->frametype != AST_FRAME_VIDEO) {
ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
return -1;
}
mark = ast_format_get_video_mark(&f->subclass.format) ? 0x8000 : 0;
if (f->subclass.format.id != AST_FORMAT_H263) {
ast_log(LOG_WARNING, "Asked to write non-h263 frame (%s)!\n", ast_getformatname(&f->subclass.format));
return -1;
}
ts = htonl(f->samples);
if ((res = fwrite(&ts, 1, sizeof(ts), fs->f)) != sizeof(ts)) {
ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
return -1;
}
len = htons(f->datalen | mark);
if ((res = fwrite(&len, 1, sizeof(len), fs->f)) != sizeof(len)) {
ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
return -1;
}
if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
return -1;
}
return 0;
}
static int h263_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
{
/* No way Jose */
return -1;
}
static int h263_trunc(struct ast_filestream *fs)
{
int fd;
off_t cur;
if ((fd = fileno(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for h263 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
if ((cur = ftello(fs->f)) < 0) {
ast_log(AST_LOG_WARNING, "Unable to determine current position in h263 filestream %p: %s\n", fs, strerror(errno));
return -1;
}
/* Truncate file to current length */
return ftruncate(fd, cur);
}
static off_t h263_tell(struct ast_filestream *fs)
{
off_t offset = ftello(fs->f);
return offset; /* XXX totally bogus, needs fixing */
}
static struct ast_format_def h263_f = {
.name = "h263",
.exts = "h263",
.open = h263_open,
.write = h263_write,
.seek = h263_seek,
.trunc = h263_trunc,
.tell = h263_tell,
.read = h263_read,
.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
.desc_size = sizeof(struct h263_desc),
};
static int load_module(void)
{
ast_format_set(&h263_f.format, AST_FORMAT_H263, 0);
if (ast_format_def_register(&h263_f))
return AST_MODULE_LOAD_FAILURE;
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
return ast_format_def_unregister(h263_f.name);
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw H.263 data",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND
);
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