358 lines
8.8 KiB
C
Executable File
358 lines
8.8 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Old-style G.723 frame/timestamp format.
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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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
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*/
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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 <arpa/inet.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <pthread.h>
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#include <sys/time.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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int fd; /* Descriptor */
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u_int32_t lasttimeout; /* Last amount of timeout */
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struct ast_channel *owner;
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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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static struct ast_filestream *glist = NULL;
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static pthread_mutex_t g723_lock = PTHREAD_MUTEX_INITIALIZER;
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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";
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static struct ast_filestream *g723_open(int fd)
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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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if (ast_pthread_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->next = glist;
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glist = tmp;
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tmp->fd = fd;
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tmp->owner = NULL;
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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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tmp->lasttimeout = -1;
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tmp->orig.tv_usec = 0;
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tmp->orig.tv_sec = 0;
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glistcnt++;
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ast_pthread_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(int fd, 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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if (ast_pthread_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->next = glist;
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glist = tmp;
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tmp->fd = fd;
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tmp->owner = NULL;
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tmp->fr = NULL;
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tmp->lasttimeout = -1;
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tmp->orig.tv_usec = 0;
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tmp->orig.tv_sec = 0;
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glistcnt++;
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ast_pthread_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)
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{
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return NULL;
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}
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static void g723_close(struct ast_filestream *s)
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{
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struct ast_filestream *tmp, *tmpl = NULL;
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if (ast_pthread_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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tmp = glist;
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while(tmp) {
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if (tmp == s) {
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if (tmpl)
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tmpl->next = tmp->next;
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else
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glist = tmp->next;
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break;
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}
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tmpl = tmp;
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tmp = tmp->next;
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}
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glistcnt--;
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if (s->owner) {
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s->owner->stream = NULL;
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if (s->owner->streamid > -1)
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ast_sched_del(s->owner->sched, s->owner->streamid);
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s->owner->streamid = -1;
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}
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ast_pthread_mutex_unlock(&g723_lock);
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ast_update_use_count();
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if (!tmp)
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ast_log(LOG_WARNING, "Freeing a filestream we don't seem to own\n");
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close(s->fd);
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free(s);
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}
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static int ast_read_callback(void *data)
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{
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u_int16_t size;
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u_int32_t delay = -1;
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int looper = 1;
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int retval = 0;
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int res;
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struct ast_filestream *s = data;
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/* Send a frame from the file to the appropriate channel */
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while(looper) {
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if (read(s->fd, &size, 2) != 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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s->owner->streamid = -1;
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return 0;
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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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s->owner->streamid = -1;
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return 0;
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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 = read(s->fd, s->fr->data , size)) != 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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s->owner->streamid = -1;
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return 0;
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}
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/* Read the delay for the next packet, and schedule again if necessary */
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if (read(s->fd, &delay, 4) == 4)
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delay = ntohl(delay);
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else
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delay = -1;
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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->timelen = 30;
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#endif
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/* Unless there is no delay, we're going to exit out as soon as we
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have processed the current frame. */
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if (delay > VOFR_FUDGE) {
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looper = 0;
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/* If there is a delay, lets schedule the next event */
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if (delay != s->lasttimeout) {
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/* We'll install the next timeout now. */
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s->owner->streamid = ast_sched_add(s->owner->sched,
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delay - VOFR_FUDGE,
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ast_read_callback, s);
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s->lasttimeout = delay;
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} else
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/* Just come back again at the same time */
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retval = -1;
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}
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/* Lastly, process the frame */
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if (ast_write(s->owner, s->fr)) {
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ast_log(LOG_WARNING, "Failed to write frame\n");
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s->owner->streamid = -1;
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return 0;
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}
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}
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return retval;
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}
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static int g723_apply(struct ast_channel *c, struct ast_filestream *s)
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{
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u_int32_t delay;
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/* Select our owner for this stream, and get the ball rolling. */
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s->owner = c;
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/* Read and ignore the first delay */
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if (read(s->fd, &delay, 4) != 4) {
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/* Empty file */
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return 0;
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}
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ast_read_callback(s);
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return 0;
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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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struct timeval now;
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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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if (!(fs->orig.tv_usec || fs->orig.tv_sec)) {
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/* First frame should have zeros for delay */
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delay = 0;
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if (gettimeofday(&fs->orig, NULL)) {
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ast_log(LOG_WARNING, "gettimeofday() failed?? What is this? Y2k?\n");
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return -1;
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}
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} else {
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if (gettimeofday(&now, NULL)) {
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ast_log(LOG_WARNING, "gettimeofday() failed?? What is this? Y2k?\n");
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return -1;
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}
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delay = (now.tv_sec - fs->orig.tv_sec) * 1000 + (now.tv_usec - fs->orig.tv_usec) / 1000;
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delay = htonl(delay);
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fs->orig.tv_sec = now.tv_sec;
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fs->orig.tv_usec = now.tv_usec;
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}
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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 = write(fs->fd, &delay, 4)) != 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 =write(fs->fd, &size, 2)) != 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 = write(fs->fd, f->data, f->datalen)) != 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 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_apply,
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g723_write,
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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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struct ast_filestream *tmp, *tmpl;
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if (ast_pthread_mutex_lock(&g723_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g723 list\n");
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return -1;
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}
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tmp = glist;
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while(tmp) {
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if (tmp->owner)
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ast_softhangup(tmp->owner);
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tmpl = tmp;
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tmp = tmp->next;
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free(tmpl);
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}
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ast_pthread_mutex_unlock(&g723_lock);
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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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int res;
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if (ast_pthread_mutex_lock(&g723_lock)) {
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ast_log(LOG_WARNING, "Unable to lock g723 list\n");
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return -1;
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}
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res = glistcnt;
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ast_pthread_mutex_unlock(&g723_lock);
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return res;
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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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