191 lines
5 KiB
C
191 lines
5 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, 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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* \arg See \ref AstVideo
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/mod_format.h"
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#include "asterisk/format_cache.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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/* According to:
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* http://lists.mpegif.org/pipermail/mp4-tech/2005-July/005741.html
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* the maximum actual frame size is not 2048, but 8192. Since the maximum
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* theoretical limit is not much larger (32k = 15bits), we'll go for that
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* size to ensure we don't corrupt frames sent to us (unless they're
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* ridiculously large). */
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#define BUF_SIZE 32768 /* Four real h.263 Frames */
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#define FRAME_ENDED 0x8000
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struct h263_desc {
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unsigned int lastts;
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};
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static int h263_open(struct ast_filestream *s)
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{
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unsigned int ts;
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if (fread(&ts, 1, sizeof(ts), s->f) != sizeof(ts)) {
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ast_log(LOG_WARNING, "Empty file!\n");
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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 struct ast_frame *h263_read(struct ast_filestream *s, int *whennext)
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{
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size_t res;
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uint32_t mark;
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unsigned short len;
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unsigned int ts;
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struct h263_desc *fs = (struct h263_desc *)s->_private;
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/* Send a frame from the file to the appropriate channel */
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if ((res = fread(&len, 1, sizeof(len), s->f)) != sizeof(len))
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return NULL;
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len = ntohs(len);
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mark = (len & FRAME_ENDED) ? 1 : 0;
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len &= 0x7fff;
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if (len > BUF_SIZE) {
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ast_log(LOG_WARNING, "Length %d is too long\n", len);
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return NULL;
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}
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AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
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if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
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if (res) {
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ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
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ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
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strerror(errno));
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}
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return NULL;
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}
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s->fr.samples = fs->lastts; /* XXX what ? */
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s->fr.datalen = len;
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s->fr.subclass.frame_ending = mark;
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if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
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fs->lastts = ntohl(ts);
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*whennext = fs->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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uint32_t mark = 0;
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mark = f->subclass.frame_ending ? FRAME_ENDED : 0;
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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.ptr, 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 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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int fd;
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off_t cur;
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if ((fd = fileno(fs->f)) < 0) {
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ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for h263 filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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if ((cur = ftello(fs->f)) < 0) {
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ast_log(AST_LOG_WARNING, "Unable to determine current position in h263 filestream %p: %s\n", fs, strerror(errno));
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return -1;
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}
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/* Truncate file to current length */
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return ftruncate(fd, cur);
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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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off_t offset = ftello(fs->f);
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return offset; /* XXX totally bogus, needs fixing */
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}
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static struct ast_format_def h263_f = {
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.name = "h263",
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.exts = "h263",
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.open = h263_open,
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.write = h263_write,
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.seek = h263_seek,
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.trunc = h263_trunc,
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.tell = h263_tell,
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.read = h263_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct h263_desc),
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};
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static int load_module(void)
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{
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h263_f.format = ast_format_h263;
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if (ast_format_def_register(&h263_f))
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return AST_MODULE_LOAD_DECLINE;
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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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return ast_format_def_unregister(h263_f.name);
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw H.263 data",
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.support_level = AST_MODULE_SUPPORT_CORE,
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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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