Some formats are able to handle short reads while others are not, so restore the previous behavior for the format modules so that we don't have spurious errors when playing back files. ASTERISK-27232 #close Reported by: Jens T. Change-Id: Iab7f52b25a394f277566c8a2a4b15a692280a300
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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