forked from osmocom/wireshark
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/* G726decode.c
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* G.726 codec
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#ifdef HAVE_SPANDSP
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#include "telephony.h"
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#include "bitstream.h"
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#include "g726.h"
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#include "G726decode.h"
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/* this isn't reentrant. Making it might involve quite a few changes to be able to pass a g726 state
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* variable to the various functions involved in G.726 decoding.
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*/
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static g726_state_t state;
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/* Currently, only G.726-32, linear encoding, left packed is supported */
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void *
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codec_g726_init(void)
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{
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memset (&state, 0, sizeof (state));
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g726_init(&state, 32000, 0, 1);
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return NULL;
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}
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void
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codec_g726_release(void *ctx _U_)
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{
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}
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int
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codec_g726_get_channels(void *ctx _U_)
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{
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return 1;
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}
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int
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codec_g726_get_frequency(void *ctx _U_)
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{
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return 32000;
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}
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/* Packing should be user defined (via the decode dialog) since due to historical reasons two diverging
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* de facto standards are in use today (see RFC3551).
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*/
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int
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codec_g726_decode(void *ctx _U_, const void *input, int inputSizeBytes, void *output,
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int *outputSizeBytes)
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{
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*outputSizeBytes = 2 * g726_decode(&state, output, (void*) input, inputSizeBytes);
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return 0;
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}
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#endif
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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