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/* codec-g722.c
* Easy codecs stub for EasyG722
* 2007 Ales Kocourek
*
* $Id$
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <memory.h>
#include "codec-g722.h"
#include "EasyG722/EasyG722.h"
struct g722_context {
CODER_HANDLE handle;
short speach_buffer[L_G722_FRAME];
};
void *codec_g722_init(void) {
struct g722_context *ctx = 0;
ctx = (struct g722_context*)g_malloc0(sizeof(struct g722_context));
ctx->handle = EasyG722_init_decoder();
return ctx;
}
void codec_g722_release(void *context) {
struct g722_context *ctx = (struct g722_context*)context;
if (!ctx) return;
EasyG722_release_decoder(ctx->handle);
g_free(ctx);
}
int codec_g722_decode(void *context, const void *input, int inputSizeBytes, void *output, int *outputSizeBytes) {
struct g722_context *ctx = (struct g722_context*)context;
const unsigned char *bitstream = (const unsigned char*)input;
short *speech = (short*)output;
int decodedBytes = 0;
int i;
if (!ctx) return 0;
if ((inputSizeBytes % L_G722_FRAME_COMPRESSED) != 0)
return 0;
if (!output)
return (inputSizeBytes / L_G722_FRAME_COMPRESSED ) * L_G722_FRAME / 2 * sizeof(short) ;
while ((inputSizeBytes >= L_G722_FRAME_COMPRESSED) &&
((*outputSizeBytes - decodedBytes) >= L_G722_FRAME / 2 * sizeof(short))) {
if (EasyG722_decoder(ctx->handle, (unsigned char*)bitstream, ctx->speach_buffer)) {
int write_index = 0;
for(i = 0; i < L_G722_FRAME; i+=2) {
ctx->speach_buffer[write_index] = ctx->speach_buffer[i];
write_index++;
}
memcpy(speech, ctx->speach_buffer, L_G722_FRAME / 2 * sizeof(short));
speech += L_G722_FRAME / 2;
decodedBytes += L_G722_FRAME / 2 * sizeof(short);
}
bitstream += L_G722_FRAME_COMPRESSED;
inputSizeBytes -= L_G722_FRAME_COMPRESSED;
}
return decodedBytes;
}
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