Version 0.1.8 from FTP
authorMark Spencer <markster@digium.com>
Sat, 7 Apr 2001 01:45:34 +0000 (01:45 +0000)
committerMark Spencer <markster@digium.com>
Sat, 7 Apr 2001 01:45:34 +0000 (01:45 +0000)
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@267 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/codec_ulaw.c [new file with mode: 0755]

diff --git a/codecs/codec_ulaw.c b/codecs/codec_ulaw.c
new file mode 100755 (executable)
index 0000000..cbe1749
--- /dev/null
@@ -0,0 +1,378 @@
+/* codec_ulaw.c - translate between signed linear and ulaw
+ * 
+ * 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/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 = "Mu-law Coder/Decoder";
+
+/* Sample frame data */
+
+#include "slin_ulaw_ex.h"
+#include "ulaw_slin_ex.h"
+
+/*
+ * Private workspace for translating signed linear signals to ulaw.
+ */
+
+struct ulaw_encoder_pvt
+{
+  struct ast_frame f;
+  char offset[AST_FRIENDLY_OFFSET];   /* Space to build offset */
+  unsigned char outbuf[BUFFER_SIZE];  /* Encoded ulaw, two nibbles to a word */
+  int tail;
+};
+
+/*
+ * Private workspace for translating ulaw signals to signed linear.
+ */
+
+struct ulaw_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;
+};
+
+/*
+ * ulawToLin_New
+ *  Create a new instance of ulaw_decoder_pvt.
+ *
+ * Results:
+ *  Returns a pointer to the new instance.
+ *
+ * Side effects:
+ *  None.
+ */
+
+static struct ast_translator_pvt *
+ulawtolin_new ()
+{
+  struct ulaw_decoder_pvt *tmp;
+  tmp = malloc (sizeof (struct ulaw_decoder_pvt));
+  if (tmp)
+    {
+         memset(tmp, 0, sizeof(*tmp));
+      tmp->tail = 0;
+      localusecnt++;
+      ast_update_use_count ();
+    }
+  return (struct ast_translator_pvt *) tmp;
+}
+
+/*
+ * LinToulaw_New
+ *  Create a new instance of ulaw_encoder_pvt.
+ *
+ * Results:
+ *  Returns a pointer to the new instance.
+ *
+ * Side effects:
+ *  None.
+ */
+
+static struct ast_translator_pvt *
+lintoulaw_new ()
+{
+  struct ulaw_encoder_pvt *tmp;
+  tmp = malloc (sizeof (struct ulaw_encoder_pvt));
+  if (tmp)
+    {
+         memset(tmp, 0, sizeof(*tmp));
+      localusecnt++;
+      ast_update_use_count ();
+      tmp->tail = 0;
+    }
+  return (struct ast_translator_pvt *) tmp;
+}
+
+/*
+ * ulawToLin_FrameIn
+ *  Fill an input buffer with packed 4-bit ulaw values if there is room
+ *  left.
+ *
+ * Results:
+ *  Foo
+ *
+ * Side effects:
+ *  tmp->tail is the number of packed values in the buffer.
+ */
+
+static int
+ulawtolin_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
+{
+  struct ulaw_decoder_pvt *tmp = (struct ulaw_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_mulaw[b[x]];
+
+  tmp->tail += f->datalen;
+  return 0;
+}
+
+/*
+ * ulawToLin_FrameOut
+ *  Convert 4-bit ulaw 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 *
+ulawtolin_frameout (struct ast_translator_pvt *pvt)
+{
+  struct ulaw_decoder_pvt *tmp = (struct ulaw_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;
+}
+
+/*
+ * LinToulaw_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
+lintoulaw_framein (struct ast_translator_pvt *pvt, struct ast_frame *f)
+{
+  struct ulaw_encoder_pvt *tmp = (struct ulaw_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_lin2mu[s[x]+32768];
+  tmp->tail += f->datalen/2;
+  return 0;
+}
+
+/*
+ * LinToulaw_FrameOut
+ *  Convert a buffer of raw 16-bit signed linear PCM to a buffer
+ *  of 4-bit ulaw packed two to a byte (Big Endian).
+ *
+ * Results:
+ *  Foo
+ *
+ * Side effects:
+ *  Leftover inbuf data gets packed, tail gets updated.
+ */
+
+static struct ast_frame *
+lintoulaw_frameout (struct ast_translator_pvt *pvt)
+{
+  struct ulaw_encoder_pvt *tmp = (struct ulaw_encoder_pvt *) pvt;
+  
+  if (tmp->tail) {
+         tmp->f.frametype = AST_FRAME_VOICE;
+         tmp->f.subclass = AST_FORMAT_ULAW;
+         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;
+}
+
+
+/*
+ * ulawToLin_Sample
+ */
+
+static struct ast_frame *
+ulawtolin_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;
+}
+
+/*
+ * LinToulaw_Sample
+ */
+
+static struct ast_frame *
+lintoulaw_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;
+}
+
+/*
+ * ulaw_Destroy
+ *  Destroys a private workspace.
+ *
+ * Results:
+ *  It's gone!
+ *
+ * Side effects:
+ *  None.
+ */
+
+static void
+ulaw_destroy (struct ast_translator_pvt *pvt)
+{
+  free (pvt);
+  localusecnt--;
+  ast_update_use_count ();
+}
+
+/*
+ * The complete translator for ulawToLin.
+ */
+
+static struct ast_translator ulawtolin = {
+  "ulawtolin",
+  AST_FORMAT_ULAW,
+  AST_FORMAT_SLINEAR,
+  ulawtolin_new,
+  ulawtolin_framein,
+  ulawtolin_frameout,
+  ulaw_destroy,
+  /* NULL */
+  ulawtolin_sample
+};
+
+/*
+ * The complete translator for LinToulaw.
+ */
+
+static struct ast_translator lintoulaw = {
+  "lintoulaw",
+  AST_FORMAT_SLINEAR,
+  AST_FORMAT_ULAW,
+  lintoulaw_new,
+  lintoulaw_framein,
+  lintoulaw_frameout,
+  ulaw_destroy,
+  /* NULL */
+  lintoulaw_sample
+};
+
+int
+unload_module (void)
+{
+  int res;
+  ast_pthread_mutex_lock (&localuser_lock);
+  res = ast_unregister_translator (&lintoulaw);
+  if (!res)
+    res = ast_unregister_translator (&ulawtolin);
+  if (localusecnt)
+    res = -1;
+  ast_pthread_mutex_unlock (&localuser_lock);
+  return res;
+}
+
+int
+load_module (void)
+{
+  int res;
+  res = ast_register_translator (&ulawtolin);
+  if (!res)
+    res = ast_register_translator (&lintoulaw);
+  else
+    ast_unregister_translator (&ulawtolin);
+  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;
+}