git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43236 65c4cc65-6c06-0410-ace0-fbb531ad65f3
164 lines
4.1 KiB
C
164 lines
4.1 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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/*!
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* \file
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*
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* \brief Old-style G.723.1 frame/timestamp format.
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*
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* \arg Extensions: g723, g723sf
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* \ingroup formats
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <unistd.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/time.h>
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#include "asterisk/lock.h"
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#include "asterisk/channel.h"
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#include "asterisk/file.h"
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#include "asterisk/logger.h"
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#include "asterisk/sched.h"
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#include "asterisk/module.h"
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#define G723_MAX_SIZE 1024
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static struct ast_frame *g723_read(struct ast_filestream *s, int *whennext)
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{
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unsigned short size;
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int res;
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int delay;
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/* Read the delay for the next packet, and schedule again if necessary */
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/* XXX is this ignored ? */
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if (fread(&delay, 1, 4, s->f) == 4)
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delay = ntohl(delay);
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else
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delay = -1;
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if (fread(&size, 1, 2, s->f) != 2) {
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/* Out of data, or the file is no longer valid. In any case
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go ahead and stop the stream */
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return NULL;
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}
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/* Looks like we have a frame to read from here */
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size = ntohs(size);
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if (size > G723_MAX_SIZE) {
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ast_log(LOG_WARNING, "Size %d is invalid\n", size);
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/* The file is apparently no longer any good, as we
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shouldn't ever get frames even close to this
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size. */
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return NULL;
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}
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/* Read the data into the buffer */
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s->fr.frametype = AST_FRAME_VOICE;
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s->fr.subclass = AST_FORMAT_G723_1;
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s->fr.mallocd = 0;
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AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, size);
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if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != size) {
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ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno));
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return NULL;
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}
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*whennext = s->fr.samples = 240;
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return &s->fr;
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}
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static int g723_write(struct ast_filestream *s, struct ast_frame *f)
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{
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uint32_t delay;
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uint16_t size;
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int res;
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/* XXX there used to be a check s->fr means a read stream */
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass != AST_FORMAT_G723_1) {
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ast_log(LOG_WARNING, "Asked to write non-g723 frame!\n");
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return -1;
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}
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delay = 0;
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if (f->datalen <= 0) {
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ast_log(LOG_WARNING, "Short frame ignored (%d bytes long?)\n", f->datalen);
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return 0;
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}
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if ((res = fwrite(&delay, 1, 4, s->f)) != 4) {
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ast_log(LOG_WARNING, "Unable to write delay: res=%d (%s)\n", res, strerror(errno));
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return -1;
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}
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size = htons(f->datalen);
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if ((res = fwrite(&size, 1, 2, s->f)) != 2) {
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ast_log(LOG_WARNING, "Unable to write size: res=%d (%s)\n", res, strerror(errno));
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return -1;
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}
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if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Unable to write frame: res=%d (%s)\n", res, 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 g723_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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return -1;
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}
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static int g723_trunc(struct ast_filestream *fs)
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{
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/* Truncate file to current length */
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if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
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return -1;
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return 0;
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}
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static off_t g723_tell(struct ast_filestream *fs)
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{
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return -1;
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}
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static const struct ast_format g723_1_f = {
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.name = "g723sf",
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.exts = "g723|g723sf",
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.format = AST_FORMAT_G723_1,
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.write = g723_write,
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.seek = g723_seek,
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.trunc = g723_trunc,
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.tell = g723_tell,
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.read = g723_read,
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.buf_size = G723_MAX_SIZE + AST_FRIENDLY_OFFSET,
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};
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static int load_module(void)
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{
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return ast_format_register(&g723_1_f);
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}
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static int unload_module(void)
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{
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return ast_format_unregister(g723_1_f.name);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "G.723.1 Simple Timestamp File Format");
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