From a0e2c58919f8b93c6b05c630a7b40fbb7e1a129d Mon Sep 17 00:00:00 2001
From: Mark Spencer <markster@digium.com>
Date: Sun, 9 Dec 2001 00:41:43 +0000
Subject: [PATCH] Version 0.1.10 from FTP
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@392 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
alaw.c | 85 +++++++++
codecs/Makefile | 3 +-
codecs/codec_alaw.c | 378 ++++++++++++++++++++++++++++++++++++++++
include/asterisk/alaw.h | 34 ++++
4 files changed, 499 insertions(+), 1 deletion(-)
create mode 100755 alaw.c
create mode 100755 codecs/codec_alaw.c
create mode 100755 include/asterisk/alaw.h
diff --git a/alaw.c b/alaw.c
new file mode 100755
index 0000000000..d0495e5f6c
--- /dev/null
+++ b/alaw.c
@@ -0,0 +1,85 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * u-Law to Signed linear conversion
+ *
+ * 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/alaw.h>
+
+#define AMI_MASK 0x55
+
+static inline unsigned char linear2alaw (short int linear)
+{
+ int mask;
+ int seg;
+ int pcm_val;
+ static int seg_end[8] =
+ {
+ 0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF
+ };
+
+ pcm_val = linear;
+ if (pcm_val >= 0)
+ {
+ /* Sign (7th) bit = 1 */
+ mask = AMI_MASK | 0x80;
+ }
+ else
+ {
+ /* Sign bit = 0 */
+ mask = AMI_MASK;
+ pcm_val = -pcm_val;
+ }
+
+ /* Convert the scaled magnitude to segment number. */
+ for (seg = 0; seg < 8; seg++)
+ {
+ if (pcm_val <= seg_end[seg])
+ break;
+ }
+ /* Combine the sign, segment, and quantization bits. */
+ return ((seg << 4) | ((pcm_val >> ((seg) ? (seg + 3) : 4)) & 0x0F)) ^ mask;
+}
+/*- End of function --------------------------------------------------------*/
+
+static inline short int alaw2linear (unsigned char alaw)
+{
+ int i;
+ int seg;
+
+ alaw ^= AMI_MASK;
+ i = ((alaw & 0x0F) << 4);
+ seg = (((int) alaw & 0x70) >> 4);
+ if (seg)
+ i = (i + 0x100) << (seg - 1);
+ return (short int) ((alaw & 0x80) ? i : -i);
+}
+
+unsigned char __ast_lin2a[8192];
+short __ast_alaw[256];
+
+void ast_alaw_init(void)
+{
+ int i;
+ /*
+ * Set up mu-law conversion table
+ */
+ for(i = 0;i < 256;i++)
+ {
+ __ast_alaw[i] = alaw2linear(i);
+ }
+ /* set up the reverse (mu-law) conversion table */
+ for(i = -32768; i < 32768; i++)
+ {
+ __ast_lin2a[((unsigned short)i) >> 3] = linear2alaw(i);
+ }
+
+}
+
diff --git a/codecs/Makefile b/codecs/Makefile
index da84127e5e..027225eb86 100755
--- a/codecs/Makefile
+++ b/codecs/Makefile
@@ -28,7 +28,8 @@ LIBGSM=gsm/lib/libgsm.a
LIBMP3=mp3/libmp3.a
LIBLPC10=lpc10/liblpc10.a
-CODECS+=$(MODG723) codec_gsm.so codec_mp3_d.so codec_lpc10.so codec_adpcm.so codec_ulaw.so
+CODECS+=$(MODG723) codec_gsm.so codec_mp3_d.so codec_lpc10.so \
+ codec_adpcm.so codec_ulaw.so codec_alaw.so codec_a_mu.so
all: $(CODECS)
diff --git a/codecs/codec_alaw.c b/codecs/codec_alaw.c
new file mode 100755
index 0000000000..9089fccbef
--- /dev/null
+++ b/codecs/codec_alaw.c
@@ -0,0 +1,378 @@
+/* codec_alaw.c - translate between signed linear and alaw
+ *
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Copyright (c) 2001 Linux Support Services, Inc. All rights reserved.
+ *
+ * Mark Spencer <markster@linux-support.net
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <asterisk/logger.h>
+#include <asterisk/module.h>
+#include <asterisk/translate.h>
+#include <asterisk/channel.h>
+#include <asterisk/alaw.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define BUFFER_SIZE 8096 /* size for the translation buffers */
+
+static pthread_mutex_t localuser_lock = PTHREAD_MUTEX_INITIALIZER;
+static int localusecnt = 0;
+
+static char *tdesc = "A-law Coder/Decoder";
+
+/* Sample frame data (Mu data is okay) */
+
+#include "slin_ulaw_ex.h"
+#include "ulaw_slin_ex.h"
+
+/*
+ * Private workspace for translating signed linear signals to alaw.
+ */
+
+struct alaw_encoder_pvt
+{
+ struct ast_frame f;
+ char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
+ unsigned char outbuf[BUFFER_SIZE]; /* Encoded alaw, two nibbles to a word */
+ int tail;
+};
+
+/*
+ * Private workspace for translating alaw signals to signed linear.
+ */
+
+struct alaw_decoder_pvt
+{
+ struct ast_frame f;
+ char offset[AST_FRIENDLY_OFFSET]; /* Space to build offset */
+ short outbuf[BUFFER_SIZE]; /* Decoded signed linear values */
+ int tail;
+};
+
+/*
+ * alawToLin_New
+ * Create a new instance of alaw_decoder_pvt.
+ *
+ * Results:
+ * Returns a pointer to the new instance.
+ *
+ * Side effects:
+ * None.
+ */
+
+static struct ast_translator_pvt *
+alawtolin_new ()
+{
+ struct alaw_decoder_pvt *tmp;
+ tmp = malloc (sizeof (struct alaw_decoder_pvt));
+ if (tmp)
+ {
+ memset(tmp, 0, sizeof(*tmp));
+ tmp->tail = 0;
+ localusecnt++;
+ ast_update_use_count ();
+ }
+ return (struct ast_translator_pvt *) tmp;
+}
+
+/*
+ * LinToalaw_New
+ * Create a new instance of alaw_encoder_pvt.
+ *
+ * Results:
+ * Returns a pointer to the new instance.
+ *
+ * Side effects:
+ * None.
+ */
+
+static struct ast_translator_pvt *
+lintoalaw_new ()
+{
+ struct alaw_encoder_pvt *tmp;
+ tmp = malloc (sizeof (struct alaw_encoder_pvt));
+ if (tmp)
+ {
+ memset(tmp, 0, sizeof(*tmp));
+ localusecnt++;
+ ast_update_use_count ();
+ tmp->tail = 0;
+ }
+ return (struct ast_translator_pvt *) tmp;
+}
+
+/*
+ * alawToLin_FrameIn
+ * Fill an input buffer with packed 4-bit alaw values if there is room
+ * left.
+ *
+ * Results:
+ * Foo
+ *
+ * Side effects:
+ * tmp->tail is the number of packed values in the buffer.
+ */
+
+static int
+alawtolin_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
+{
+ struct alaw_decoder_pvt *tmp = (struct alaw_decoder_pvt *) pvt;
+ int x;
+ unsigned char *b;
+
+ if ((tmp->tail + f->datalen) * 2 > sizeof(tmp->outbuf)) {
+ ast_log(LOG_WARNING, "Out of buffer space\n");
+ return -1;
+ }
+
+ /* Reset ssindex and signal to frame's specified values */
+ b = f->data;
+ for (x=0;x<f->datalen;x++)
+ tmp->outbuf[tmp->tail + x] = AST_ALAW(b[x]);
+
+ tmp->tail += f->datalen;
+ return 0;
+}
+
+/*
+ * alawToLin_FrameOut
+ * Convert 4-bit alaw encoded signals to 16-bit signed linear.
+ *
+ * Results:
+ * Converted signals are placed in tmp->f.data, tmp->f.datalen
+ * and tmp->f.timelen are calculated.
+ *
+ * Side effects:
+ * None.
+ */
+
+static struct ast_frame *
+alawtolin_frameout (struct ast_translator_pvt *pvt)
+{
+ struct alaw_decoder_pvt *tmp = (struct alaw_decoder_pvt *) pvt;
+
+ if (!tmp->tail)
+ return NULL;
+
+ tmp->f.frametype = AST_FRAME_VOICE;
+ tmp->f.subclass = AST_FORMAT_SLINEAR;
+ tmp->f.datalen = tmp->tail *2;
+ tmp->f.timelen = tmp->tail / 8;
+ tmp->f.mallocd = 0;
+ tmp->f.offset = AST_FRIENDLY_OFFSET;
+ tmp->f.src = __PRETTY_FUNCTION__;
+ tmp->f.data = tmp->outbuf;
+ tmp->tail = 0;
+ return &tmp->f;
+}
+
+/*
+ * LinToalaw_FrameIn
+ * Fill an input buffer with 16-bit signed linear PCM values.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * tmp->tail is number of signal values in the input buffer.
+ */
+
+static int
+lintoalaw_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
+{
+ struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *) pvt;
+ int x;
+ short *s;
+ if (tmp->tail + f->datalen/2 >= sizeof(tmp->outbuf))
+ {
+ ast_log (LOG_WARNING, "Out of buffer space\n");
+ return -1;
+ }
+ s = f->data;
+ for (x=0;x<f->datalen/2;x++)
+ tmp->outbuf[x+tmp->tail] = AST_LIN2A(s[x]);
+ tmp->tail += f->datalen/2;
+ return 0;
+}
+
+/*
+ * LinToalaw_FrameOut
+ * Convert a buffer of raw 16-bit signed linear PCM to a buffer
+ * of 4-bit alaw packed two to a byte (Big Endian).
+ *
+ * Results:
+ * Foo
+ *
+ * Side effects:
+ * Leftover inbuf data gets packed, tail gets updated.
+ */
+
+static struct ast_frame *
+lintoalaw_frameout (struct ast_translator_pvt *pvt)
+{
+ struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *) pvt;
+
+ if (tmp->tail) {
+ tmp->f.frametype = AST_FRAME_VOICE;
+ tmp->f.subclass = AST_FORMAT_ALAW;
+ tmp->f.timelen = tmp->tail / 8;
+ tmp->f.mallocd = 0;
+ tmp->f.offset = AST_FRIENDLY_OFFSET;
+ tmp->f.src = __PRETTY_FUNCTION__;
+ tmp->f.data = tmp->outbuf;
+ tmp->f.datalen = tmp->tail;
+ tmp->tail = 0;
+ return &tmp->f;
+ } else return NULL;
+}
+
+
+/*
+ * alawToLin_Sample
+ */
+
+static struct ast_frame *
+alawtolin_sample ()
+{
+ static struct ast_frame f;
+ f.frametype = AST_FRAME_VOICE;
+ f.subclass = AST_FORMAT_ALAW;
+ f.datalen = sizeof (ulaw_slin_ex);
+ f.timelen = sizeof(ulaw_slin_ex) / 8;
+ f.mallocd = 0;
+ f.offset = 0;
+ f.src = __PRETTY_FUNCTION__;
+ f.data = ulaw_slin_ex;
+ return &f;
+}
+
+/*
+ * LinToalaw_Sample
+ */
+
+static struct ast_frame *
+lintoalaw_sample ()
+{
+ static struct ast_frame f;
+ f.frametype = AST_FRAME_VOICE;
+ f.subclass = AST_FORMAT_SLINEAR;
+ f.datalen = sizeof (slin_ulaw_ex);
+ /* Assume 8000 Hz */
+ f.timelen = sizeof (slin_ulaw_ex) / 16;
+ f.mallocd = 0;
+ f.offset = 0;
+ f.src = __PRETTY_FUNCTION__;
+ f.data = slin_ulaw_ex;
+ return &f;
+}
+
+/*
+ * alaw_Destroy
+ * Destroys a private workspace.
+ *
+ * Results:
+ * It's gone!
+ *
+ * Side effects:
+ * None.
+ */
+
+static void
+alaw_destroy (struct ast_translator_pvt *pvt)
+{
+ free (pvt);
+ localusecnt--;
+ ast_update_use_count ();
+}
+
+/*
+ * The complete translator for alawToLin.
+ */
+
+static struct ast_translator alawtolin = {
+ "alawtolin",
+ AST_FORMAT_ALAW,
+ AST_FORMAT_SLINEAR,
+ alawtolin_new,
+ alawtolin_framein,
+ alawtolin_frameout,
+ alaw_destroy,
+ /* NULL */
+ alawtolin_sample
+};
+
+/*
+ * The complete translator for LinToalaw.
+ */
+
+static struct ast_translator lintoalaw = {
+ "lintoalaw",
+ AST_FORMAT_SLINEAR,
+ AST_FORMAT_ALAW,
+ lintoalaw_new,
+ lintoalaw_framein,
+ lintoalaw_frameout,
+ alaw_destroy,
+ /* NULL */
+ lintoalaw_sample
+};
+
+int
+unload_module (void)
+{
+ int res;
+ ast_pthread_mutex_lock (&localuser_lock);
+ res = ast_unregister_translator (&lintoalaw);
+ if (!res)
+ res = ast_unregister_translator (&alawtolin);
+ if (localusecnt)
+ res = -1;
+ ast_pthread_mutex_unlock (&localuser_lock);
+ return res;
+}
+
+int
+load_module (void)
+{
+ int res;
+ res = ast_register_translator (&alawtolin);
+ if (!res)
+ res = ast_register_translator (&lintoalaw);
+ else
+ ast_unregister_translator (&alawtolin);
+ return res;
+}
+
+/*
+ * Return a description of this module.
+ */
+
+char *
+description (void)
+{
+ return tdesc;
+}
+
+int
+usecount (void)
+{
+ int res;
+ STANDARD_USECOUNT (res);
+ return res;
+}
+
+char *
+key ()
+{
+ return ASTERISK_GPL_KEY;
+}
diff --git a/include/asterisk/alaw.h b/include/asterisk/alaw.h
new file mode 100755
index 0000000000..6861955bb5
--- /dev/null
+++ b/include/asterisk/alaw.h
@@ -0,0 +1,34 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * A-Law to Signed linear conversion
+ *
+ * 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
+ */
+
+#ifndef _ASTERISK_ALAW_H
+#define _ASTERISK_ALAW_H
+
+//! Init the ulaw conversion stuff
+/*!
+ * To init the ulaw to slinear conversion stuff, this needs to be run.
+ */
+extern void ast_alaw_init(void);
+
+//! converts signed linear to mulaw
+/*!
+ */
+extern unsigned char __ast_lin2a[8192];
+
+//! help
+extern short __ast_alaw[256];
+
+#define AST_LIN2A(a) (__ast_lin2a[((unsigned short)(a)) >> 3])
+#define AST_ALAW(a) (__ast_alaw[(a)])
+
+#endif
--
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