codecs/G711a/G711adecode.c

   1 /* G711adecode.c
   2  * A-law G.711 codec
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include <glib.h>
  26 #include "G711adecode.h"
  27 #include "G711atable.h"
  28
  29 int
  30 decodeG711a(void *input, int inputSizeBytes, void *output, int *outputSizeBytes)
  31 {
  32   guint8 *dataIn = (guint8 *)input;
  33   gint16 *dataOut = (gint16 *)output;
  34   int i;
  35
  36   for (i=0; i<inputSizeBytes; i++)
  37   {
  38     dataOut[i] = alaw_exp_table[dataIn[i]];
  39   }
  40   *outputSizeBytes = inputSizeBytes * 2;
  41   return 0;
  42 }