From bbff5356cc393e11f24ec2d3021e4fea2902a937 Mon Sep 17 00:00:00 2001
From: Mark Spencer <markster@digium.com>
Date: Wed, 4 Apr 2001 23:58:17 +0000
Subject: [PATCH] Version 0.1.8 from FTP
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@265 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
formats/format_pcm.c | 298 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 298 insertions(+)
create mode 100755 formats/format_pcm.c
diff --git a/formats/format_pcm.c b/formats/format_pcm.c
new file mode 100755
index 0000000000..dfd4ec3668
--- /dev/null
+++ b/formats/format_pcm.c
@@ -0,0 +1,298 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Flat, binary, ulaw PCM file format.
+ *
+ * Copyright (C) 1999, Mark Spencer
+ *
+ * Mark Spencer <markster@linux-support.net>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <asterisk/channel.h>
+#include <asterisk/file.h>
+#include <asterisk/logger.h>
+#include <asterisk/sched.h>
+#include <asterisk/module.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <pthread.h>
+#include <endian.h>
+
+#define BUF_SIZE 160 /* 160 samples */
+
+struct ast_filestream {
+ void *reserved[AST_RESERVED_POINTERS];
+ /* Believe it or not, we must decode/recode to account for the
+ weird MS format */
+ /* This is what a filestream means to us */
+ int fd; /* Descriptor */
+ struct ast_channel *owner;
+ struct ast_frame fr; /* Frame information */
+ char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
+ char empty; /* Empty character */
+ unsigned char buf[BUF_SIZE]; /* Output Buffer */
+ int lasttimeout;
+ struct timeval last;
+ int adj;
+ struct ast_filestream *next;
+};
+
+
+static struct ast_filestream *glist = NULL;
+static pthread_mutex_t pcm_lock = PTHREAD_MUTEX_INITIALIZER;
+static int glistcnt = 0;
+
+static char *name = "pcm";
+static char *desc = "Raw uLaw 8khz Audio support (PCM)";
+static char *exts = "pcm|ulaw|ul|mu";
+
+static struct ast_filestream *pcm_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)))) {
+ memset(tmp, 0, sizeof(struct ast_filestream));
+ if (pthread_mutex_lock(&pcm_lock)) {
+ ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+ free(tmp);
+ return NULL;
+ }
+ tmp->next = glist;
+ glist = tmp;
+ tmp->fd = fd;
+ tmp->owner = NULL;
+ tmp->fr.data = tmp->buf;
+ tmp->fr.frametype = AST_FRAME_VOICE;
+ tmp->fr.subclass = AST_FORMAT_ULAW;
+ /* datalen will vary for each frame */
+ tmp->fr.src = name;
+ tmp->fr.mallocd = 0;
+ tmp->lasttimeout = -1;
+ glistcnt++;
+ pthread_mutex_unlock(&pcm_lock);
+ ast_update_use_count();
+ }
+ return tmp;
+}
+
+static struct ast_filestream *pcm_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)))) {
+ memset(tmp, 0, sizeof(struct ast_filestream));
+ if (pthread_mutex_lock(&pcm_lock)) {
+ ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+ free(tmp);
+ return NULL;
+ }
+ tmp->next = glist;
+ glist = tmp;
+ tmp->fd = fd;
+ tmp->owner = NULL;
+ tmp->lasttimeout = -1;
+ glistcnt++;
+ pthread_mutex_unlock(&pcm_lock);
+ ast_update_use_count();
+ } else
+ ast_log(LOG_WARNING, "Out of memory\n");
+ return tmp;
+}
+
+static struct ast_frame *pcm_read(struct ast_filestream *s)
+{
+ return NULL;
+}
+
+static void pcm_close(struct ast_filestream *s)
+{
+ struct ast_filestream *tmp, *tmpl = NULL;
+ if (pthread_mutex_lock(&pcm_lock)) {
+ ast_log(LOG_WARNING, "Unable to lock pcm 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(&pcm_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)
+{
+ int retval = 0;
+ int res;
+ int delay;
+ struct ast_filestream *s = data;
+ struct timeval tv;
+ /* Send a frame from the file to the appropriate channel */
+
+ s->fr.frametype = AST_FRAME_VOICE;
+ s->fr.subclass = AST_FORMAT_ULAW;
+ s->fr.offset = AST_FRIENDLY_OFFSET;
+ s->fr.mallocd = 0;
+ s->fr.data = s->buf;
+ if ((res = read(s->fd, s->buf, BUF_SIZE)) < 1) {
+ if (res)
+ ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
+ s->owner->streamid = -1;
+ return 0;
+ }
+ s->fr.timelen = res / 8;
+ s->fr.datalen = res;
+ delay = s->fr.timelen;
+ /* 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;
+ }
+ if (s->last.tv_usec || s->last.tv_usec) {
+ int ms;
+ gettimeofday(&tv, NULL);
+ ms = 1000 * (tv.tv_sec - s->last.tv_sec) +
+ (tv.tv_usec - s->last.tv_usec) / 1000;
+ s->last.tv_sec = tv.tv_sec;
+ s->last.tv_usec = tv.tv_usec;
+ if ((ms - delay) * (ms - delay) > 4) {
+ /* Compensate if we're more than 2 ms off */
+ s->adj -= (ms - delay);
+ }
+#if 0
+ fprintf(stdout, "Delay is %d, adjustment is %d, last was %d\n", delay, s->adj, ms);
+#endif
+ delay += s->adj;
+ if (delay < 1)
+ delay = 1;
+ } else
+ gettimeofday(&s->last, NULL);
+ if (s->lasttimeout != delay) {
+ /* We'll install the next timeout now. */
+ s->owner->streamid = ast_sched_add(s->owner->sched,
+ delay, ast_read_callback, s);
+ s->lasttimeout = delay;
+ } else {
+ /* Just come back again at the same time */
+ retval = -1;
+ }
+ return retval;
+}
+
+static int pcm_apply(struct ast_channel *c, struct ast_filestream *s)
+{
+ /* Select our owner for this stream, and get the ball rolling. */
+ s->owner = c;
+ ast_read_callback(s);
+ return 0;
+}
+
+static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
+{
+ int res;
+ if (f->frametype != AST_FRAME_VOICE) {
+ ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
+ return -1;
+ }
+ if (f->subclass != AST_FORMAT_ULAW) {
+ ast_log(LOG_WARNING, "Asked to write non-ulaw frame (%d)!\n", f->subclass);
+ return -1;
+ }
+ if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) {
+ ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
+ return -1;
+ }
+ return 0;
+}
+
+static char *pcm_getcomment(struct ast_filestream *s)
+{
+ return NULL;
+}
+
+int load_module()
+{
+ return ast_format_register(name, exts, AST_FORMAT_ULAW,
+ pcm_open,
+ pcm_rewrite,
+ pcm_apply,
+ pcm_write,
+ pcm_read,
+ pcm_close,
+ pcm_getcomment);
+
+
+}
+
+int unload_module()
+{
+ struct ast_filestream *tmp, *tmpl;
+ if (pthread_mutex_lock(&pcm_lock)) {
+ ast_log(LOG_WARNING, "Unable to lock pcm 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(&pcm_lock);
+ return ast_format_unregister(name);
+}
+
+int usecount()
+{
+ int res;
+ if (pthread_mutex_lock(&pcm_lock)) {
+ ast_log(LOG_WARNING, "Unable to lock pcm list\n");
+ return -1;
+ }
+ res = glistcnt;
+ pthread_mutex_unlock(&pcm_lock);
+ return res;
+}
+
+char *description()
+{
+ return desc;
+}
+
+
+char *key()
+{
+ return ASTERISK_GPL_KEY;
+}
--
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