forked from osmocom/wireshark
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/* G729decode.c
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* G.729 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_BCG729
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#include "bcg729/decoder.h"
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#include "G729decode.h"
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void *
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codec_g729_init(void)
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{
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return initBcg729DecoderChannel();
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}
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void
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codec_g729_release(void *ctx)
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{
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closeBcg729DecoderChannel((bcg729DecoderChannelContextStruct *)ctx);
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}
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unsigned
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codec_g729_get_channels(void *ctx _U_)
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{
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return 1;
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}
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unsigned
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codec_g729_get_frequency(void *ctx _U_)
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{
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return 8000;
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}
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size_t
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codec_g729_decode(void *ctx, const void *input, size_t inputSizeBytes, void *output,
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size_t *outputSizeBytes)
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{
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bcg729DecoderChannelContextStruct *state = (bcg729DecoderChannelContextStruct *)ctx;
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guint8 *dataIn = (guint8 *) input;
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gint16 *dataOut = (gint16 *) output;
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size_t i;
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if (!ctx) {
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return 0;
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}
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if (!output || !outputSizeBytes) {
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return 80*2*(inputSizeBytes/10);
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}
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/* The G729 algorithm encodes 10ms of voice into 80bit (10 bytes).
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Based on the RTP packetization period (usually 20ms), we need to
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pass to the bcg729 decoder chunks of 10ms (10 bytes)
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*/
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for (i = 0; i < (inputSizeBytes/10); i++) {
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bcg729Decoder(state, dataIn + i*10, 10, 0, 0, 0, dataOut + i*80);
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}
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*outputSizeBytes = 80*2*(inputSizeBytes/10);
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return *outputSizeBytes;
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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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