Version 0.1.10 from FTP

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@392 65c4cc65-6c06-0410-ace0-fbb531ad65f3

alaw.c

+/*
+ * 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);
+	   }
+
+}
+

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)
 

codecs/codec_alaw.c

+/* 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;
+}

include/asterisk/alaw.h

+/*
+ * 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