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279 lines
6.6 KiB
279 lines
6.6 KiB
/*
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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 <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.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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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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#include "../channels/adtranvofr.h"
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#define G723_MAX_SIZE 1024
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struct ast_filestream {
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/* First entry MUST be reserved for the channel type */
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void *reserved[AST_RESERVED_POINTERS];
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/* This is what a filestream means to us */
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FILE *f; /* Descriptor */
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struct ast_filestream *next;
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struct ast_frame *fr; /* Frame representation of buf */
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struct timeval orig; /* Original frame time */
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char buf[G723_MAX_SIZE + AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
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};
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AST_MUTEX_DEFINE_STATIC(g723_lock);
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static int glistcnt = 0;
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static char *name = "g723sf";
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static char *desc = "G.723.1 Simple Timestamp File Format";
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static char *exts = "g723|g723sf";
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static struct ast_filestream *g723_open(FILE *f)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g723_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g723 list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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tmp->fr = (struct ast_frame *)tmp->buf;
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tmp->fr->data = tmp->buf + sizeof(struct ast_frame);
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tmp->fr->frametype = AST_FRAME_VOICE;
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tmp->fr->subclass = AST_FORMAT_G723_1;
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/* datalen will vary for each frame */
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tmp->fr->src = name;
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tmp->fr->mallocd = 0;
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glistcnt++;
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ast_mutex_unlock(&g723_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *g723_rewrite(FILE *f, const char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&g723_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g723 list\n");
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free(tmp);
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return NULL;
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}
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tmp->f = f;
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glistcnt++;
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ast_mutex_unlock(&g723_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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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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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 - sizeof(struct ast_frame)) {
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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->offset = AST_FRIENDLY_OFFSET;
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s->fr->datalen = size;
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s->fr->data = s->buf + sizeof(struct ast_frame) + AST_FRIENDLY_OFFSET;
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if ((res = fread(s->fr->data, 1, size, 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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#if 0
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/* Average out frames <= 50 ms */
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if (delay < 50)
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s->fr->timelen = 30;
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else
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s->fr->timelen = delay;
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#else
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s->fr->samples = 240;
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#endif
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*whennext = s->fr->samples;
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return s->fr;
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}
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static void g723_close(struct ast_filestream *s)
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{
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if (ast_mutex_lock(&g723_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g723 list\n");
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return;
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}
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glistcnt--;
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ast_mutex_unlock(&g723_lock);
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ast_update_use_count();
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fclose(s->f);
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free(s);
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s = NULL;
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}
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static int g723_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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u_int32_t delay;
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u_int16_t size;
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int res;
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if (fs->fr) {
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ast_log(LOG_WARNING, "Asked to write on a read stream??\n");
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return -1;
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}
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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, fs->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, fs->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, fs->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, long 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), ftell(fs->f)) < 0)
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return -1;
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return 0;
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}
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static long 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 char *g723_getcomment(struct ast_filestream *s)
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{
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return NULL;
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}
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int load_module()
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{
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return ast_format_register(name, exts, AST_FORMAT_G723_1,
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g723_open,
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g723_rewrite,
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g723_write,
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g723_seek,
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g723_trunc,
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g723_tell,
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g723_read,
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g723_close,
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g723_getcomment);
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}
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int unload_module()
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{
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return ast_format_unregister(name);
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}
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int usecount()
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{
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return glistcnt;
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}
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char *description()
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{
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return desc;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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