diff options
author | Pascal Quantin <pascal.quantin@gmail.com> | 2017-07-26 23:23:12 +0200 |
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committer | Anders Broman <a.broman58@gmail.com> | 2017-07-30 05:22:35 +0000 |
commit | 3e54cabf8193e6a8cd607b1671defb8b6800b53d (patch) | |
tree | 63297098c0c26c1c875ab0959d9679d70b3c6e65 /codecs/G729 | |
parent | 32b446d5a8f146565b81324d1a18bcb053e07c5f (diff) |
Add G.729 decoding based on bcg729 library
Bug: 13635
Change-Id: Ic22a0719a59da13e51425aeb747e88caca0d6512
Reviewed-on: https://code.wireshark.org/review/22808
Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
Diffstat (limited to 'codecs/G729')
-rw-r--r-- | codecs/G729/G729decode.c | 95 | ||||
-rw-r--r-- | codecs/G729/G729decode.h | 46 |
2 files changed, 141 insertions, 0 deletions
diff --git a/codecs/G729/G729decode.c b/codecs/G729/G729decode.c new file mode 100644 index 0000000000..e5bb2ea61c --- /dev/null +++ b/codecs/G729/G729decode.c @@ -0,0 +1,95 @@ +/* G729decode.c + * G.729 codec + * + * 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" + +#include <glib.h> +#ifdef HAVE_BCG729 +#include "bcg729/decoder.h" +#include "G729decode.h" + +void * +codec_g729_init(void) +{ + return initBcg729DecoderChannel(); +} + +void +codec_g729_release(void *ctx) +{ + closeBcg729DecoderChannel((bcg729DecoderChannelContextStruct *)ctx); +} + +unsigned +codec_g729_get_channels(void *ctx _U_) +{ + return 1; +} + +unsigned +codec_g729_get_frequency(void *ctx _U_) +{ + return 8000; +} + +size_t +codec_g729_decode(void *ctx, const void *input, size_t inputSizeBytes, void *output, + size_t *outputSizeBytes) +{ + bcg729DecoderChannelContextStruct *state = (bcg729DecoderChannelContextStruct *)ctx; + guint8 *dataIn = (guint8 *) input; + gint16 *dataOut = (gint16 *) output; + size_t i; + + if (!ctx) { + return 0; + } + + if (!output || !outputSizeBytes) { + return 80*2*(inputSizeBytes/10); + } + + /* The G729 algorithm encodes 10ms of voice into 80bit (10 bytes). + Based on the RTP packetization period (usually 20ms), we need to + pass to the bcg729 decoder chunks of 10ms (10 bytes) + */ + for (i = 0; i < (inputSizeBytes/10); i++) { + bcg729Decoder(state, dataIn + i*10, 10, 0, 0, 0, dataOut + i*80); + } + *outputSizeBytes = 80*2*(inputSizeBytes/10); + return *outputSizeBytes; +} + +#endif + +/* + * 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/G729/G729decode.h b/codecs/G729/G729decode.h new file mode 100644 index 0000000000..5ccd1a9782 --- /dev/null +++ b/codecs/G729/G729decode.h @@ -0,0 +1,46 @@ +/* G729decode.h + * Definitions for G.729 codec + * + * 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. + */ + +#ifndef __CODECS_G729DECODE_H__ +#define __CODECS_G729DECODE_H__ + +void *codec_g729_init(void); +void codec_g729_release(void *ctx); +unsigned codec_g729_get_channels(void *ctx); +unsigned codec_g729_get_frequency(void *ctx); +size_t codec_g729_decode(void *ctx, const void *input, size_t inputSizeBytes, void *output, + size_t *outputSizeBytes); + +#endif /* G729decode.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: + */ |