forked from osmocom/wireshark
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* codec-g7231.c
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* Easy codecs stub for EasyG7231
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* 2007 Ales Kocourek
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*
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* $Id$
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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 <memory.h>
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#include "codec-g7231.h"
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#include "EasyG7231/EasyG7231.h"
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struct g7231_context {
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CODER_HANDLE handle;
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short speach_buffer[L_G7231_FRAME];
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int l_g7231_frame_compressed;
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};
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void *codec_g7231_init(void) {
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struct g7231_context *ctx = 0;
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ctx = (struct g7231_context*)g_malloc0(sizeof(struct g7231_context));
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ctx->handle = -1;
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return ctx;
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}
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void codec_g7231_release(void *context) {
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struct g7231_context *ctx = (struct g7231_context*)context;
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if (!ctx) return;
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EasyG7231_release_decoder(ctx->handle);
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g_free(ctx);
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}
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int codec_g7231_decode(void *context, const void *input, int inputSizeBytes, void *output, int *outputSizeBytes) {
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struct g7231_context *ctx = (struct g7231_context*)context;
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const unsigned char *bitstream = (const unsigned char*)input;
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short *speech = (short*)output;
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int decodedBytes = 0;
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if (!ctx) return 0;
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if ( ctx->handle == -1) {
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if ( bitstream[0] & 0x03 ) {
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ctx->handle=EasyG7231_init_decoder(FALSE);
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ctx->l_g7231_frame_compressed = L_G7231_FRAME_COMPRESSED_53;
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} else {
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ctx->handle=EasyG7231_init_decoder(TRUE);
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ctx->l_g7231_frame_compressed = L_G7231_FRAME_COMPRESSED_63;
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}
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}
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if ((inputSizeBytes % ctx->l_g7231_frame_compressed) != 0)
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return 0;
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if (!output)
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return (inputSizeBytes / ctx->l_g7231_frame_compressed) * L_G7231_FRAME * sizeof(short);
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while ((inputSizeBytes >= ctx->l_g7231_frame_compressed) &&
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((*outputSizeBytes - decodedBytes) >= L_G7231_FRAME * sizeof(short))) {
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if (EasyG7231_decoder(ctx->handle, (unsigned char*)bitstream, ctx->speach_buffer)) {
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memcpy(speech, ctx->speach_buffer, L_G7231_FRAME * sizeof(short));
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speech += L_G7231_FRAME;
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decodedBytes += L_G7231_FRAME * sizeof(short);
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}
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bitstream += ctx->l_g7231_frame_compressed;
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inputSizeBytes -= ctx->l_g7231_frame_compressed;
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}
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return decodedBytes;
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}
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