Version 0.1.10 from FTP

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@393 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/codec_a_mu.c

@@ -0,0 +1,325 @@
+/* codec_a_mu.c - translate between alaw and ulaw directly
+ * 
+ * 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 <asterisk/ulaw.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 and Mulaw direct Coder/Decoder";
+
+static unsigned char mu2a[256];
+static unsigned char a2mu[256];
+
+/* Sample frame data (Mu data is okay) */
+
+#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 laws.
+ */
+
+struct ulaw_encoder_pvt
+{
+  struct ast_frame f;
+  char offset[AST_FRIENDLY_OFFSET];	/* Space to build offset */
+  unsigned char outbuf[BUFFER_SIZE];	/* Encoded ulaw values */
+  int tail;
+};
+
+static struct ast_translator_pvt *
+alawtoulaw_new ()
+{
+  struct ulaw_encoder_pvt *tmp;
+  tmp = malloc (sizeof (struct ulaw_encoder_pvt));
+  if (tmp)
+    {
+	  memset(tmp, 0, sizeof(*tmp));
+      tmp->tail = 0;
+      localusecnt++;
+      ast_update_use_count ();
+    }
+  return (struct ast_translator_pvt *) tmp;
+}
+
+static struct ast_translator_pvt *
+ulawtoalaw_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;
+}
+
+static int
+alawtoulaw_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
+{
+  struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *) pvt;
+  int x;
+  unsigned char *b;
+
+  if ((tmp->tail + f->datalen)> 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] = a2mu[b[x]];
+
+  tmp->tail += f->datalen;
+  return 0;
+}
+
+static struct ast_frame *
+alawtoulaw_frameout (struct ast_translator_pvt *pvt)
+{
+  struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *) pvt;
+
+  if (!tmp->tail)
+    return NULL;
+
+  tmp->f.frametype = AST_FRAME_VOICE;
+  tmp->f.subclass = AST_FORMAT_ULAW;
+  tmp->f.datalen = tmp->tail;
+  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;
+}
+
+static int
+ulawtoalaw_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
+{
+  struct alaw_encoder_pvt *tmp = (struct alaw_encoder_pvt *) pvt;
+  int x;
+  unsigned char *s;
+  if (tmp->tail + f->datalen >= sizeof(tmp->outbuf))
+    {
+      ast_log (LOG_WARNING, "Out of buffer space\n");
+      return -1;
+    }
+  s = f->data;
+  for (x=0;x<f->datalen;x++) 
+  	tmp->outbuf[x+tmp->tail] = mu2a[s[x]];
+  tmp->tail += f->datalen;
+  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 *
+ulawtoalaw_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 *
+alawtoulaw_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;
+}
+
+static struct ast_frame *
+ulawtoalaw_sample ()
+{
+  static struct ast_frame f;
+  f.frametype = AST_FRAME_VOICE;
+  f.subclass = AST_FORMAT_ULAW;
+  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;
+}
+
+
+/*
+ * 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 alawtoulaw = {
+  "alawtoulaw",
+  AST_FORMAT_ALAW,
+  AST_FORMAT_ULAW,
+  alawtoulaw_new,
+  alawtoulaw_framein,
+  alawtoulaw_frameout,
+  alaw_destroy,
+  /* NULL */
+  alawtoulaw_sample
+};
+
+/*
+ * The complete translator for LinToalaw.
+ */
+
+static struct ast_translator ulawtoalaw = {
+  "ulawtoalaw",
+  AST_FORMAT_ULAW,
+  AST_FORMAT_ALAW,
+  ulawtoalaw_new,
+  ulawtoalaw_framein,
+  ulawtoalaw_frameout,
+  alaw_destroy,
+  /* NULL */
+  ulawtoalaw_sample
+};
+
+int
+unload_module (void)
+{
+  int res;
+  ast_pthread_mutex_lock (&localuser_lock);
+  res = ast_unregister_translator (&ulawtoalaw);
+  if (!res)
+    res = ast_unregister_translator (&alawtoulaw);
+  if (localusecnt)
+    res = -1;
+  ast_pthread_mutex_unlock (&localuser_lock);
+  return res;
+}
+
+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);
+  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;
+}