diff options
Diffstat (limited to '1.4.23-rc4/formats/format_h263.c')
| -rw-r--r-- | 1.4.23-rc4/formats/format_h263.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/1.4.23-rc4/formats/format_h263.c b/1.4.23-rc4/formats/format_h263.c new file mode 100644 index 000000000..baa7a3efd --- /dev/null +++ b/1.4.23-rc4/formats/format_h263.c @@ -0,0 +1,197 @@ +/* + * 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 + */ + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include <unistd.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <stdlib.h> +#include <sys/time.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> + +#include "asterisk/lock.h" +#include "asterisk/channel.h" +#include "asterisk/file.h" +#include "asterisk/logger.h" +#include "asterisk/sched.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; + int res; + + if ((res = 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; + int 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; + s->fr.subclass = AST_FORMAT_H263; + s->fr.mallocd = 0; + AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len); + if ((res = fread(s->fr.data, 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; + s->fr.subclass |= mark; + 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; + int subclass; + int mark=0; + if (f->frametype != AST_FRAME_VIDEO) { + ast_log(LOG_WARNING, "Asked to write non-video frame!\n"); + return -1; + } + subclass = f->subclass; + if (subclass & 0x1) + mark=0x8000; + subclass &= ~0x1; + if (subclass != AST_FORMAT_H263) { + ast_log(LOG_WARNING, "Asked to write non-h263 frame (%d)!\n", f->subclass); + 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, 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) +{ + /* Truncate file to current length */ + if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0) + return -1; + return 0; +} + +static off_t h263_tell(struct ast_filestream *fs) +{ + off_t offset = ftello(fs->f); + return offset; /* XXX totally bogus, needs fixing */ +} + +static const struct ast_format h263_f = { + .name = "h263", + .exts = "h263", + .format = AST_FORMAT_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) +{ + return ast_format_register(&h263_f); +} + +static int unload_module(void) +{ + return ast_format_unregister(h263_f.name); +} + +AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw H.263 data"); |