From 77e92cb5dce9b9f5f2689c3ca58705f67edad616 Mon Sep 17 00:00:00 2001 From: Daniel Willmann Date: Tue, 12 Jul 2016 20:25:33 +0200 Subject: Add AMR codec support CMake work and rebase on current wireshark master by Pau Espin Pedrol. Change-Id: I5ec963b910f8f271aa2e5d680ea33e2170a6f367 --- codecs/amr/amrdecode.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++ codecs/amr/amrdecode.h | 48 +++++++++++++++++++++++++ 2 files changed, 146 insertions(+) create mode 100644 codecs/amr/amrdecode.c create mode 100644 codecs/amr/amrdecode.h (limited to 'codecs/amr') diff --git a/codecs/amr/amrdecode.c b/codecs/amr/amrdecode.c new file mode 100644 index 0000000000..22b3f584b8 --- /dev/null +++ b/codecs/amr/amrdecode.c @@ -0,0 +1,98 @@ +/* amrdecode.c + * AMR codec + * + * Wireshark - Network traffic analyzer + * By Gerald Combs + * 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" + +#include +#include +#include "amrdecode.h" +#include "ws_attributes.h" + +#include + +void * +codec_amr_init(void) +{ + void *state; + state = Decoder_Interface_init(); + + return state; +} + +void +codec_amr_release(void *state) +{ + Decoder_Interface_exit(state); +} + +unsigned +codec_amr_get_channels(void *ctx _U_) +{ + return 1; +} + +unsigned +codec_amr_get_frequency(void *ctx _U_) +{ + return 8000; +} + +size_t +codec_amr_decode(void *state, const void *input, size_t inputSizeBytes, void *output, + size_t *outputSizeBytes) +{ + int mode; + unsigned packet_size; + static const uint8_t block_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0}; + + /* First byte is CMR, second is the Payload TOC */ + mode = (((uint8_t *)input)[1] >> 3) & 0x0F; + packet_size = block_size[mode] + 2; + + if (!output || !outputSizeBytes) + return 160*2; + + *outputSizeBytes = 160 * 2; /* 160 frames, two byte per frame, 20ms */ + + /* If the size is screwed up, insert silence */ + if (packet_size > inputSizeBytes) { + memset(output, 0, *outputSizeBytes); + return *outputSizeBytes; + } + + Decoder_Interface_Decode(state, (const unsigned char *)input+1, (short *)output, 0); + return *outputSizeBytes; +} + +/* + * 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: + */ + diff --git a/codecs/amr/amrdecode.h b/codecs/amr/amrdecode.h new file mode 100644 index 0000000000..5cd5552abb --- /dev/null +++ b/codecs/amr/amrdecode.h @@ -0,0 +1,48 @@ +/* G726decode.h + * Definitions for A-law G.722 codec + * + * Wireshark - Network traffic analyzer + * By Gerald Combs + * 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. + */ + +#ifndef __CODECS_AMRDECODE_H__ +#define __CODECS_AMRDECODE_H__ + +#include + +void *codec_amr_init(void); +void codec_amr_release(void *ctx); +unsigned codec_amr_get_channels(void *ctx); +unsigned codec_amr_get_frequency(void *ctx); +size_t codec_amr_decode(void *ctx, const void *input, size_t inputSizeBytes, void *output, + size_t *outputSizeBytes); + +#endif /* AMRdecode.h */ + +/* + * 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: + */ -- cgit v1.2.3