2006-09-04 23:21:52 +00:00
|
|
|
/* G711udecode.c
|
|
|
|
* mu-law G.711 codec
|
|
|
|
*
|
|
|
|
* Wireshark - Network traffic analyzer
|
|
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
|
|
* Copyright 1998 Gerald Combs
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public License
|
|
|
|
* as published by the Free Software Foundation; either version 2
|
|
|
|
* of the License, or (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program; if not, write to the Free Software
|
2012-06-28 22:56:06 +00:00
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
2006-09-04 23:21:52 +00:00
|
|
|
*/
|
|
|
|
|
2012-09-14 13:08:17 +00:00
|
|
|
#include "config.h"
|
|
|
|
|
2006-08-30 20:47:16 +00:00
|
|
|
#include <glib.h>
|
2012-09-14 13:08:17 +00:00
|
|
|
|
2006-08-30 20:47:16 +00:00
|
|
|
#include "G711udecode.h"
|
|
|
|
#include "G711utable.h"
|
|
|
|
|
2012-09-14 13:08:17 +00:00
|
|
|
void *
|
|
|
|
codec_g711u_init(void)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
codec_g711u_release(void *ctx _U_)
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2015-09-04 15:12:25 +00:00
|
|
|
unsigned
|
2012-09-14 13:08:17 +00:00
|
|
|
codec_g711u_get_channels(void *ctx _U_)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2015-09-04 15:12:25 +00:00
|
|
|
unsigned
|
2012-09-14 13:08:17 +00:00
|
|
|
codec_g711u_get_frequency(void *ctx _U_)
|
2006-08-30 20:47:16 +00:00
|
|
|
{
|
2012-09-14 13:08:17 +00:00
|
|
|
return 8000;
|
2006-08-30 20:47:16 +00:00
|
|
|
}
|
2012-09-14 13:08:17 +00:00
|
|
|
|
2015-09-04 15:12:25 +00:00
|
|
|
size_t
|
|
|
|
codec_g711u_decode(void *ctx _U_, const void *input, size_t inputSizeBytes, void *output,
|
|
|
|
size_t *outputSizeBytes)
|
2012-09-14 13:08:17 +00:00
|
|
|
{
|
|
|
|
const guint8 *dataIn = (const guint8 *) input;
|
|
|
|
gint16 *dataOut = (gint16 *) output;
|
2015-09-04 15:12:25 +00:00
|
|
|
size_t i;
|
2012-09-14 13:08:17 +00:00
|
|
|
|
|
|
|
if (!output || !outputSizeBytes) {
|
|
|
|
return inputSizeBytes * 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < inputSizeBytes; i++)
|
|
|
|
{
|
|
|
|
dataOut[i] = ulaw_exp_table[dataIn[i]];
|
|
|
|
}
|
|
|
|
|
|
|
|
*outputSizeBytes = inputSizeBytes * 2;
|
|
|
|
return inputSizeBytes * 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
|
|
*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 4
|
|
|
|
* tab-width: 8
|
|
|
|
* indent-tabs-mode: nil
|
|
|
|
* End:
|
|
|
|
*
|
|
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
|
|
*/
|
|
|
|
|