From f8247040e6231c4b3b5099ea3a526348b7941566 Mon Sep 17 00:00:00 2001
From: russell <russell@f38db490-d61c-443f-a65b-d21fe96a405b>
Date: Sat, 19 Jan 2008 00:19:29 +0000
Subject: Creating tag for the release of asterisk-1.6.0-beta1

git-svn-id: http://svn.digium.com/svn/asterisk/tags/1.6.0-beta1@99163 f38db490-d61c-443f-a65b-d21fe96a405b
---
 trunk/codecs/codec_a_mu.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 trunk/codecs/codec_a_mu.c

(limited to 'trunk/codecs/codec_a_mu.c')

diff --git a/trunk/codecs/codec_a_mu.c b/trunk/codecs/codec_a_mu.c
new file mode 100644
index 000000000..a478dc7af
--- /dev/null
+++ b/trunk/codecs/codec_a_mu.c
@@ -0,0 +1,159 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2005, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.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 codec_a_mu.c - translate between alaw and ulaw directly
+ *
+ * \ingroup codecs
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/module.h"
+#include "asterisk/translate.h"
+#include "asterisk/alaw.h"
+#include "asterisk/ulaw.h"
+#include "asterisk/utils.h"
+
+#define BUFFER_SAMPLES   8000	/* size for the translation buffers */
+
+static unsigned char mu2a[256];
+static unsigned char a2mu[256];
+
+/* Sample frame data (Mu data is okay) */
+
+#include "ulaw_slin_ex.h"
+
+/*! \brief convert frame data and store into the buffer */
+static int alawtoulaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
+{
+	int x = f->samples;
+	unsigned char *src = f->data;
+	unsigned char *dst = (unsigned char *)pvt->outbuf + pvt->samples;
+
+	pvt->samples += x;
+	pvt->datalen += x;
+
+	while (x--)
+		*dst++ = a2mu[*src++];
+
+	return 0;
+}
+
+/*! \brief convert frame data and store into the buffer */
+static int ulawtoalaw_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
+{
+	int x = f->samples;
+	unsigned char *src = f->data;
+	unsigned char *dst = (unsigned char *)pvt->outbuf + pvt->samples;
+
+	pvt->samples += x;
+	pvt->datalen += x;
+
+	while (x--)
+		*dst++ = mu2a[*src++];
+
+	return 0;
+}
+
+/*
+ * alawToLin_Sample. Just random data, somehow...
+ */
+static struct ast_frame *alawtoulaw_sample(void)
+{
+	static struct ast_frame f;
+	f.frametype = AST_FRAME_VOICE;
+	f.subclass = AST_FORMAT_ALAW;
+	f.datalen = sizeof(ulaw_slin_ex);
+	f.samples = sizeof(ulaw_slin_ex);
+	f.mallocd = 0;
+	f.offset = 0;
+	f.src = __PRETTY_FUNCTION__;
+	f.data = ulaw_slin_ex; /* XXX what ? */
+	return &f;
+}
+
+static struct ast_frame *ulawtoalaw_sample(void)
+{
+	static struct ast_frame f;
+	f.frametype = AST_FRAME_VOICE;
+	f.subclass = AST_FORMAT_ULAW;
+	f.datalen = sizeof(ulaw_slin_ex);
+	f.samples = sizeof(ulaw_slin_ex);
+	f.mallocd = 0;
+	f.offset = 0;
+	f.src = __PRETTY_FUNCTION__;
+	f.data = ulaw_slin_ex;
+	return &f;
+}
+
+static struct ast_translator alawtoulaw = {
+	.name = "alawtoulaw",
+	.srcfmt = AST_FORMAT_ALAW,
+	.dstfmt = AST_FORMAT_ULAW,
+	.framein = alawtoulaw_framein,
+	.sample = alawtoulaw_sample,
+	.buffer_samples = BUFFER_SAMPLES,
+	.buf_size = BUFFER_SAMPLES,
+};
+
+static struct ast_translator ulawtoalaw = {
+	.name = "ulawtoalaw",
+	.srcfmt = AST_FORMAT_ULAW,
+	.dstfmt = AST_FORMAT_ALAW,
+	.framein = ulawtoalaw_framein,
+	.sample = ulawtoalaw_sample,
+	.buffer_samples = BUFFER_SAMPLES,
+	.buf_size = BUFFER_SAMPLES,
+};
+
+/*! \brief standard module glue */
+
+static int unload_module(void)
+{
+	int res;
+
+	res = ast_unregister_translator(&ulawtoalaw);
+	res |= ast_unregister_translator(&alawtoulaw);
+
+	return res;
+}
+
+static int load_module(void)
+{
+	int res;
+	int x;
+
+	for (x=0;x<256;x++) {
+		mu2a[x] = AST_LIN2A(AST_MULAW(x));
+		a2mu[x] = AST_LIN2MU(AST_ALAW(x));
+	}
+	res = ast_register_translator(&alawtoulaw);
+	if (!res)
+		res = ast_register_translator(&ulawtoalaw);
+	else
+		ast_unregister_translator(&alawtoulaw);
+	if (res)
+		return AST_MODULE_LOAD_FAILURE;
+	return AST_MODULE_LOAD_SUCCESS;
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "A-law and Mulaw direct Coder/Decoder");
-- 
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