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/* codec-g7231.c
* Easy codecs stub for EasyG7231
* 2007 Ales Kocourek
*
* 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 <string.h>
#include <glib.h>
#include "codec-g7231.h"
#include "EasyG7231/EasyG7231.h"
struct g7231_context {
CODER_HANDLE handle;
short speach_buffer[L_G7231_FRAME];
int l_g7231_frame_compressed;
};
void *codec_g7231_init(void) {
struct g7231_context *ctx = 0;
ctx = (struct g7231_context*)g_malloc0(sizeof(struct g7231_context));
ctx->handle = -1;
return ctx;
}
void codec_g7231_release(void *context) {
struct g7231_context *ctx = (struct g7231_context*)context;
if (!ctx) return;
EasyG7231_release_decoder(ctx->handle);
g_free(ctx);
}
int codec_g7231_decode(void *context, const void *input, int inputSizeBytes, void *output, int *outputSizeBytes) {
struct g7231_context *ctx = (struct g7231_context*)context;
const unsigned char *bitstream = (const unsigned char*)input;
short *speech = (short*)output;
int decodedBytes = 0;
if (!ctx) return 0;
if ( ctx->handle == -1) {
if ( bitstream[0] & 0x03 ) {
ctx->handle=EasyG7231_init_decoder(FALSE);
ctx->l_g7231_frame_compressed = L_G7231_FRAME_COMPRESSED_53;
} else {
ctx->handle=EasyG7231_init_decoder(TRUE);
ctx->l_g7231_frame_compressed = L_G7231_FRAME_COMPRESSED_63;
}
}
if ((inputSizeBytes % ctx->l_g7231_frame_compressed) != 0)
return 0;
if (!output)
return (inputSizeBytes / ctx->l_g7231_frame_compressed) * L_G7231_FRAME * sizeof(short);
while ((inputSizeBytes >= ctx->l_g7231_frame_compressed) &&
((*outputSizeBytes - decodedBytes) >= L_G7231_FRAME * sizeof(short))) {
if (EasyG7231_decoder(ctx->handle, (unsigned char*)bitstream, ctx->speach_buffer)) {
memcpy(speech, ctx->speach_buffer, L_G7231_FRAME * sizeof(short));
speech += L_G7231_FRAME;
decodedBytes += L_G7231_FRAME * sizeof(short);
}
bitstream += ctx->l_g7231_frame_compressed;
inputSizeBytes -= ctx->l_g7231_frame_compressed;
}
return decodedBytes;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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