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-rw-r--r--1.4.23-rc4/formats/format_sln.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/1.4.23-rc4/formats/format_sln.c b/1.4.23-rc4/formats/format_sln.c
new file mode 100644
index 000000000..c8c5cc04b
--- /dev/null
+++ b/1.4.23-rc4/formats/format_sln.c
@@ -0,0 +1,141 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2005, Anthony Minessale
+ * Anthony Minessale (anthmct@yahoo.com)
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief RAW SLINEAR Format
+ * \arg File name extensions: sln, raw
+ * \ingroup formats
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <unistd.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#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 "asterisk/endian.h"
+
+#define BUF_SIZE 320 /* 320 bytes, 160 samples */
+#define SLIN_SAMPLES 160
+
+static struct ast_frame *slinear_read(struct ast_filestream *s, int *whennext)
+{
+ int res;
+ /* Send a frame from the file to the appropriate channel */
+
+ s->fr.frametype = AST_FRAME_VOICE;
+ s->fr.subclass = AST_FORMAT_SLINEAR;
+ s->fr.mallocd = 0;
+ AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
+ if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) < 1) {
+ if (res)
+ ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
+ return NULL;
+ }
+ *whennext = s->fr.samples = res/2;
+ s->fr.datalen = res;
+ 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 = fwrite(f->data, 1, f->datalen, fs->f)) != 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, off_t sample_offset, int whence)
+{
+ off_t offset=0,min,cur,max;
+
+ min = 0;
+ sample_offset <<= 1;
+ cur = ftello(fs->f);
+ fseeko(fs->f, 0, SEEK_END);
+ max = ftello(fs->f);
+ 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 fseeko(fs->f, offset, SEEK_SET);
+}
+
+static int slinear_trunc(struct ast_filestream *fs)
+{
+ return ftruncate(fileno(fs->f), ftello(fs->f));
+}
+
+static off_t slinear_tell(struct ast_filestream *fs)
+{
+ return ftello(fs->f) / 2;
+}
+
+static const struct ast_format slin_f = {
+ .name = "sln",
+ .exts = "sln|raw",
+ .format = AST_FORMAT_SLINEAR,
+ .write = slinear_write,
+ .seek = slinear_seek,
+ .trunc = slinear_trunc,
+ .tell = slinear_tell,
+ .read = slinear_read,
+ .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
+};
+
+static int load_module(void)
+{
+ return ast_format_register(&slin_f);
+}
+
+static int unload_module(void)
+{
+ return ast_format_unregister(slin_f.name);
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw Signed Linear Audio support (SLN)");