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
184 lines
4.7 KiB
C
184 lines
4.7 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 h264 data.
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* \arg File name extension: h264
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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 makeh264e.c by Jeffrey Chilton */
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/* Portions of the conversion code are by guido@sienanet.it */
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/*! \todo Check this buf size estimate, it may be totally wrong for large frame video */
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#define FRAME_ENDED 0x8000
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#define BUF_SIZE 4096 /* Two Real h264 Frames */
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struct h264_desc {
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unsigned int lastts;
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};
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static int h264_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 *h264_read(struct ast_filestream *s, int *whennext)
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{
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size_t 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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struct h264_desc *fs = (struct h264_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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len = BUF_SIZE; /* XXX truncate */
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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;
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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 h264_write(struct ast_filestream *s, 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 mark;
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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), s->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), s->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, s->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 h264_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 h264_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 h264 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 h264 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 h264_tell(struct ast_filestream *fs)
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{
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off_t offset = ftell(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 h264_f = {
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.name = "h264",
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.exts = "h264",
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.open = h264_open,
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.write = h264_write,
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.seek = h264_seek,
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.trunc = h264_trunc,
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.tell = h264_tell,
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.read = h264_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct h264_desc),
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};
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static int load_module(void)
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{
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h264_f.format = ast_format_h264;
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if (ast_format_def_register(&h264_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(h264_f.name);
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw H.264 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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