From 2ebc2065550f624e6eea5850d6495d341b8fbbfe Mon Sep 17 00:00:00 2001 From: Mark Spencer Date: Sun, 5 Dec 1999 01:29:36 +0000 Subject: Version 0.1.0 from FTP git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@86 65c4cc65-6c06-0410-ace0-fbb531ad65f3 --- formats/format_g723.c | 342 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 342 insertions(+) create mode 100755 formats/format_g723.c (limited to 'formats/format_g723.c') diff --git a/formats/format_g723.c b/formats/format_g723.c new file mode 100755 index 000000000..827987049 --- /dev/null +++ b/formats/format_g723.c @@ -0,0 +1,342 @@ +/* + * Asterisk -- A telephony toolkit for Linux. + * + * Old-style G.723 frame/timestamp format. + * + * Copyright (C) 1999, Adtran Inc. and Linux Support Services, LLC + * + * Mark Spencer + * + * This program is free software, distributed under the terms of + * the GNU General Public License + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "../channels/adtranvofr.h" + + +#define G723_MAX_SIZE 1024 + +struct ast_filestream { + /* First entry MUST be reserved for the channel type */ + void *reserved[AST_RESERVED_POINTERS]; + /* This is what a filestream means to us */ + int fd; /* Descriptor */ + u_int32_t lasttimeout; /* Last amount of timeout */ + struct ast_channel *owner; + struct ast_filestream *next; + struct ast_frame *fr; /* Frame representation of buf */ + struct timeval orig; /* Original frame time */ + char buf[G723_MAX_SIZE + AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */ +}; + + +static struct ast_filestream *glist = NULL; +static pthread_mutex_t g723_lock = PTHREAD_MUTEX_INITIALIZER; +static int glistcnt = 0; + +static char *name = "g723sf"; +static char *desc = "G.723.1 Simple Timestamp File Format"; +static char *exts = "g723"; + +static struct ast_filestream *g723_open(int fd) +{ + /* We don't have any header to read or anything really, but + if we did, it would go here. We also might want to check + and be sure it's a valid file. */ + struct ast_filestream *tmp; + if ((tmp = malloc(sizeof(struct ast_filestream)))) { + if (pthread_mutex_lock(&g723_lock)) { + ast_log(LOG_WARNING, "Unable to lock g723 list\n"); + free(tmp); + return NULL; + } + tmp->next = glist; + glist = tmp; + tmp->fd = fd; + tmp->owner = NULL; + tmp->fr = (struct ast_frame *)tmp->buf; + tmp->fr->data = tmp->buf + sizeof(struct ast_frame); + tmp->fr->frametype = AST_FRAME_VOICE; + tmp->fr->subclass = AST_FORMAT_G723_1; + /* datalen will vary for each frame */ + tmp->fr->src = name; + tmp->fr->mallocd = 0; + tmp->lasttimeout = -1; + tmp->orig.tv_usec = 0; + tmp->orig.tv_sec = 0; + glistcnt++; + pthread_mutex_unlock(&g723_lock); + ast_update_use_count(); + } + return tmp; +} + +static struct ast_filestream *g723_rewrite(int fd, char *comment) +{ + /* We don't have any header to read or anything really, but + if we did, it would go here. We also might want to check + and be sure it's a valid file. */ + struct ast_filestream *tmp; + if ((tmp = malloc(sizeof(struct ast_filestream)))) { + if (pthread_mutex_lock(&g723_lock)) { + ast_log(LOG_WARNING, "Unable to lock g723 list\n"); + free(tmp); + return NULL; + } + tmp->next = glist; + glist = tmp; + tmp->fd = fd; + tmp->owner = NULL; + tmp->fr = NULL; + tmp->lasttimeout = -1; + glistcnt++; + pthread_mutex_unlock(&g723_lock); + ast_update_use_count(); + } else + ast_log(LOG_WARNING, "Out of memory\n"); + return tmp; +} + +static struct ast_frame *g723_read(struct ast_filestream *s) +{ + return NULL; +} + +static void g723_close(struct ast_filestream *s) +{ + struct ast_filestream *tmp, *tmpl = NULL; + if (pthread_mutex_lock(&g723_lock)) { + ast_log(LOG_WARNING, "Unable to lock g723 list\n"); + return; + } + tmp = glist; + while(tmp) { + if (tmp == s) { + if (tmpl) + tmpl->next = tmp->next; + else + glist = tmp->next; + break; + } + tmpl = tmp; + tmp = tmp->next; + } + glistcnt--; + if (s->owner) { + s->owner->stream = NULL; + if (s->owner->streamid > -1) + ast_sched_del(s->owner->sched, s->owner->streamid); + s->owner->streamid = -1; + } + pthread_mutex_unlock(&g723_lock); + ast_update_use_count(); + if (!tmp) + ast_log(LOG_WARNING, "Freeing a filestream we don't seem to own\n"); + close(s->fd); + free(s); +} + +static int ast_read_callback(void *data) +{ + u_int16_t size; + u_int32_t delay = -1; + int looper = 1; + int retval = 0; + int res; + struct ast_filestream *s = data; + /* Send a frame from the file to the appropriate channel */ + while(looper) { + if (read(s->fd, &size, 2) != 2) { + /* Out of data, or the file is no longer valid. In any case + go ahead and stop the stream */ + s->owner->streamid = -1; + return 0; + } + /* Looks like we have a frame to read from here */ + size = ntohs(size); + if (size > G723_MAX_SIZE - sizeof(struct ast_frame)) { + ast_log(LOG_WARNING, "Size %d is invalid\n", size); + /* The file is apparently no longer any good, as we + shouldn't ever get frames even close to this + size. */ + s->owner->streamid = -1; + return 0; + } + /* Read the data into the buffer */ + s->fr->offset = AST_FRIENDLY_OFFSET; + s->fr->datalen = size; + s->fr->data = s->buf + sizeof(struct ast_frame) + AST_FRIENDLY_OFFSET; + if ((res = read(s->fd, s->fr->data , size)) != size) { + ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno)); + s->owner->streamid = -1; + return 0; + } + /* Read the delay for the next packet, and schedule again if necessary */ + if (read(s->fd, &delay, 4) == 4) + delay = ntohl(delay); + else + delay = -1; + /* Average out frames <= 40 ms */ + if (delay < 41) + s->fr->timelen = 30; + else + s->fr->timelen = delay; + /* Unless there is no delay, we're going to exit out as soon as we + have processed the current frame. */ + if (delay > VOFR_FUDGE) { + looper = 0; + /* If there is a delay, lets schedule the next event */ + if (delay != s->lasttimeout) { + /* We'll install the next timeout now. */ + s->owner->streamid = ast_sched_add(s->owner->sched, + delay - VOFR_FUDGE, + ast_read_callback, s); + + s->lasttimeout = delay; + } else + /* Just come back again at the same time */ + retval = -1; + } + /* Lastly, process the frame */ + if (ast_write(s->owner, s->fr)) { + ast_log(LOG_WARNING, "Failed to write frame\n"); + s->owner->streamid = -1; + return 0; + } + } + return retval; +} + +static int g723_apply(struct ast_channel *c, struct ast_filestream *s) +{ + u_int32_t delay; + /* Select our owner for this stream, and get the ball rolling. */ + s->owner = c; + /* Read and ignore the first delay */ + if (read(s->fd, &delay, 4) != 4) { + ast_log(LOG_WARNING, "Bad stream?\n"); + return -1; + } + ast_read_callback(s); + return 0; +} + +static int g723_write(struct ast_filestream *fs, struct ast_frame *f) +{ + struct timeval now; + u_int32_t delay; + u_int16_t size; + int res; + if (fs->fr) { + ast_log(LOG_WARNING, "Asked to write on a read stream??\n"); + return -1; + } + if (f->frametype != AST_FRAME_VOICE) { + ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); + return -1; + } + if (f->subclass != AST_FORMAT_G723_1) { + ast_log(LOG_WARNING, "Asked to write non-g723 frame!\n"); + return -1; + } + if (!(fs->orig.tv_usec || fs->orig.tv_sec)) { + /* First frame should have zeros for delay */ + delay = 0; + if (gettimeofday(&fs->orig, NULL)) { + ast_log(LOG_WARNING, "gettimeofday() failed?? What is this? Y2k?\n"); + return -1; + } + } else { + if (gettimeofday(&now, NULL)) { + ast_log(LOG_WARNING, "gettimeofday() failed?? What is this? Y2k?\n"); + return -1; + } + delay = (now.tv_sec - fs->orig.tv_sec) * 1000 + (now.tv_usec - fs->orig.tv_usec) / 1000; + delay = htonl(delay); + fs->orig.tv_sec = now.tv_sec; + fs->orig.tv_usec = now.tv_usec; + } + if ((res = write(fs->fd, &delay, 4)) != 4) { + ast_log(LOG_WARNING, "Unable to write delay: res=%d (%s)\n", res, strerror(errno)); + return -1; + } + size = htons(f->datalen); + if ((res =write(fs->fd, &size, 2)) != 2) { + ast_log(LOG_WARNING, "Unable to write size: res=%d (%s)\n", res, strerror(errno)); + return -1; + } + if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) { + ast_log(LOG_WARNING, "Unable to write frame: res=%d (%s)\n", res, strerror(errno)); + return -1; + } + return 0; +} + +char *g723_getcomment(struct ast_filestream *s) +{ + return NULL; +} + +int load_module() +{ + return ast_format_register(name, exts, AST_FORMAT_G723_1, + g723_open, + g723_rewrite, + g723_apply, + g723_write, + g723_read, + g723_close, + g723_getcomment); + + +} + +int unload_module() +{ + struct ast_filestream *tmp, *tmpl; + if (pthread_mutex_lock(&g723_lock)) { + ast_log(LOG_WARNING, "Unable to lock g723 list\n"); + return -1; + } + tmp = glist; + while(tmp) { + if (tmp->owner) + ast_softhangup(tmp->owner); + tmpl = tmp; + tmp = tmp->next; + free(tmpl); + } + pthread_mutex_unlock(&g723_lock); + return ast_format_unregister(name); +} + +int usecount() +{ + int res; + if (pthread_mutex_lock(&g723_lock)) { + ast_log(LOG_WARNING, "Unable to lock g723 list\n"); + return -1; + } + res = glistcnt; + pthread_mutex_unlock(&g723_lock); + return res; +} + +char *description() +{ + return desc; +} + -- cgit v1.2.3