forked from osmocom/wireshark
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* amrdecode.c
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* AMR 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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#include <string.h>
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#include "amrdecode.h"
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#include "ws_attributes.h"
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#include <opencore-amrnb/interf_dec.h>
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void *
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codec_amr_init(void)
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{
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void *state;
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state = Decoder_Interface_init();
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return state;
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}
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void
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codec_amr_release(void *state)
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{
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Decoder_Interface_exit(state);
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}
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unsigned
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codec_amr_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_amr_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_amr_decode(void *state, const void *input, size_t inputSizeBytes, void *output,
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size_t *outputSizeBytes)
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{
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int mode;
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unsigned packet_size;
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static const uint8_t block_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
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/* First byte is CMR, second is the Payload TOC */
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mode = (((uint8_t *)input)[1] >> 3) & 0x0F;
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packet_size = block_size[mode] + 2;
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if (!output || !outputSizeBytes)
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return 160*2;
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*outputSizeBytes = 160 * 2; /* 160 frames, two byte per frame, 20ms */
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/* If the size is screwed up, insert silence */
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if (packet_size > inputSizeBytes) {
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memset(output, 0, *outputSizeBytes);
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return *outputSizeBytes;
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}
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Decoder_Interface_Decode(state, (const unsigned char *)input+1, (short *)output, 0);
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return *outputSizeBytes;
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}
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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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