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/* sbc.c
* Support for external Bluetooth SBC codec
*
* Copyright 2012, Michal Labedzki for Tieto Corporation
*
* $Id$
*
* 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#ifdef HAVE_SBC
#include <glib.h>
#include <sbc/sbc.h>
#include "sbc.h"
#define SBC_BUFFER 8192
void *
codec_sbc_init(void)
{
sbc_t *sbc;
sbc = g_malloc(sizeof(sbc_t));
sbc_init(sbc, 0L);
return sbc;
}
void
codec_sbc_release(void *ctx)
{
sbc_t *sbc = (sbc_t *) ctx;
sbc_finish(sbc);
g_free(sbc);
}
int
codec_sbc_get_channels(void *ctx)
{
sbc_t *sbc = (sbc_t *) ctx;
if (sbc->mode == SBC_MODE_MONO)
return 1;
return 2;
}
int
codec_sbc_get_frequency(void *ctx)
{
sbc_t *sbc = (sbc_t *) ctx;
int frequency;
switch (sbc->frequency) {
case SBC_FREQ_16000:
frequency = 16000;
break;
case SBC_FREQ_32000:
frequency = 32000;
break;
case SBC_FREQ_44100:
frequency = 44100;
break;
case SBC_FREQ_48000:
frequency = 48000;
break;
default:
frequency = 0;
}
return frequency;
}
int
codec_sbc_decode(void *ctx, const void *input, int inputSizeBytes, void *output,
int *outputSizeBytes)
{
size_t size_in = (size_t) inputSizeBytes;
size_t size_out = SBC_BUFFER;
size_t len;
int framelen;
int xframe_pos = 0;
guint8 *data_in = (guint8 *) input;
guint8 *data_out = (guint8 *) output;
sbc_t *sbc = (sbc_t *) ctx;
guint8 *i_data;
guint8 tmp;
if (!output || !outputSizeBytes) {
return size_out;
}
sbc->endian = SBC_BE;
framelen = 0;
*outputSizeBytes = 0;
while (xframe_pos < inputSizeBytes) {
framelen = sbc_decode(sbc, data_in, size_in, data_out, size_out, &len);
xframe_pos += framelen;
data_in += framelen;
*outputSizeBytes += len;
for (i_data = data_out; i_data < data_out + len; i_data += 2) {
tmp = i_data[0];
i_data[0] = i_data[1];
i_data[1] = tmp;
}
data_out += len;
}
return *outputSizeBytes;
}
#endif
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