Add Anthony's format_sln (bug #2381)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3726 65c4cc65-6c06-0410-ace0-fbb531ad65f3

formats/Makefile

@@ -13,7 +13,8 @@
 
 FORMAT_LIBS=format_gsm.so format_wav.so \
 	format_wav_gsm.so format_vox.so format_pcm.so format_g729.so \
-	format_pcm_alaw.so format_h263.so format_g726.so format_ilbc.so
+	format_pcm_alaw.so format_h263.so format_g726.so format_ilbc.so \
+	format_sln.so
 FORMAT_LIBS+=format_jpeg.so
 #
 # G723 simple frame is depricated

formats/format_sln.c

@@ -0,0 +1,238 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * RAW SLINEAR Format
+ * Anthony Minessale (anthmct@yahoo.com)
+ * Derived from format_pcm.c in the asterisk distro
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+ 
+#include <asterisk/lock.h>
+#include <asterisk/channel.h>
+#include <asterisk/file.h>
+#include <asterisk/logger.h>
+#include <asterisk/sched.h>
+#include <asterisk/module.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#ifdef __linux__
+#include <endian.h>
+#else
+#include <machine/endian.h>
+#endif
+
+#define BUF_SIZE 320		/* 320 samples */
+
+struct ast_filestream {
+	void *reserved[AST_RESERVED_POINTERS];
+	/* 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 */
+	struct timeval last;
+};
+
+
+AST_MUTEX_DEFINE_STATIC(slinear_lock);
+static int glistcnt = 0;
+
+static char *name = "sln";
+static char *desc = "Raw Signed Linear Audio support (SLN)";
+static char *exts = "sln|raw";
+
+static struct ast_filestream *slinear_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 (ast_mutex_lock(&slinear_lock)) {
+			ast_log(LOG_WARNING, "Unable to lock slinear list\n");
+			free(tmp);
+			return NULL;
+		}
+		tmp->fd = fd;
+		tmp->fr.data = tmp->buf;
+		tmp->fr.frametype = AST_FRAME_VOICE;
+		tmp->fr.subclass = AST_FORMAT_SLINEAR;
+		/* datalen will vary for each frame */
+		tmp->fr.src = name;
+		tmp->fr.mallocd = 0;
+		glistcnt++;
+		ast_mutex_unlock(&slinear_lock);
+		ast_update_use_count();
+	}
+	return tmp;
+}
+
+static struct ast_filestream *slinear_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 (ast_mutex_lock(&slinear_lock)) {
+			ast_log(LOG_WARNING, "Unable to lock slinear list\n");
+			free(tmp);
+			return NULL;
+		}
+		tmp->fd = fd;
+		glistcnt++;
+		ast_mutex_unlock(&slinear_lock);
+		ast_update_use_count();
+	} else
+		ast_log(LOG_WARNING, "Out of memory\n");
+	return tmp;
+}
+
+static void slinear_close(struct ast_filestream *s)
+{
+	if (ast_mutex_lock(&slinear_lock)) {
+		ast_log(LOG_WARNING, "Unable to lock slinear list\n");
+		return;
+	}
+	glistcnt--;
+	ast_mutex_unlock(&slinear_lock);
+	ast_update_use_count();
+	close(s->fd);
+	free(s);
+	s = NULL;
+}
+
+static struct ast_frame *slinear_read(struct ast_filestream *s, int *whennext)
+{
+	int res;
+	int delay;
+	/* Send a frame from the file to the appropriate channel */
+
+	s->fr.frametype = AST_FRAME_VOICE;
+	s->fr.subclass = AST_FORMAT_SLINEAR;
+	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));
+		return NULL;
+	}
+	s->fr.samples = res/2;
+	s->fr.datalen = res;
+	delay = s->fr.samples;
+	*whennext = delay;
+	return &s->fr;
+}
+
+static int slinear_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_SLINEAR) {
+		ast_log(LOG_WARNING, "Asked to write non-slinear 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 int slinear_seek(struct ast_filestream *fs, long sample_offset, int whence)
+{
+	off_t offset=0,min,cur,max;
+
+	min = 0;
+	cur = lseek(fs->fd, 0, SEEK_CUR);
+	max = lseek(fs->fd, 0, SEEK_END);
+	if (whence == SEEK_SET)
+		offset = sample_offset;
+	else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
+		offset = sample_offset + cur;
+	else if (whence == SEEK_END)
+		offset = max - sample_offset;
+	if (whence != SEEK_FORCECUR) {
+		offset = (offset > max)?max:offset;
+	}
+	// always protect against seeking past begining.
+	offset = (offset < min)?min:offset;
+	return lseek(fs->fd, offset, SEEK_SET);
+}
+
+static int slinear_trunc(struct ast_filestream *fs)
+{
+	return ftruncate(fs->fd, lseek(fs->fd,0,SEEK_CUR));
+}
+
+static long slinear_tell(struct ast_filestream *fs)
+{
+	off_t offset;
+	offset = lseek(fs->fd, 0, SEEK_CUR);
+	return offset;
+}
+
+static char *slinear_getcomment(struct ast_filestream *s)
+{
+	return NULL;
+}
+
+int load_module()
+{
+	return ast_format_register(name, exts, AST_FORMAT_SLINEAR,
+								slinear_open,
+								slinear_rewrite,
+								slinear_write,
+								slinear_seek,
+								slinear_trunc,
+								slinear_tell,
+								slinear_read,
+								slinear_close,
+								slinear_getcomment);
+								
+								
+}
+
+int unload_module()
+{
+	return ast_format_unregister(name);
+}	
+
+int usecount()
+{
+	int res;
+	if (ast_mutex_lock(&slinear_lock)) {
+		ast_log(LOG_WARNING, "Unable to lock slinear list\n");
+		return -1;
+	}
+	res = glistcnt;
+	ast_mutex_unlock(&slinear_lock);
+	return res;
+}
+
+char *description()
+{
+	return desc;
+}
+
+
+char *key()
+{
+	return ASTERISK_GPL_KEY;
+}