forked from osmocom/wireshark
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* codec-g722.c
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* Easy codecs stub for EasyG722
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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-g722.h"
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#include "EasyG722/EasyG722.h"
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struct g722_context {
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CODER_HANDLE handle;
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short speach_buffer[L_G722_FRAME];
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};
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void *codec_g722_init(void) {
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struct g722_context *ctx = 0;
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ctx = (struct g722_context*)g_malloc0(sizeof(struct g722_context));
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ctx->handle = EasyG722_init_decoder();
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return ctx;
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}
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void codec_g722_release(void *context) {
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struct g722_context *ctx = (struct g722_context*)context;
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if (!ctx) return;
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EasyG722_release_decoder(ctx->handle);
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g_free(ctx);
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}
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int codec_g722_decode(void *context, const void *input, int inputSizeBytes, void *output, int *outputSizeBytes) {
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struct g722_context *ctx = (struct g722_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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int i;
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if (!ctx) return 0;
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if ((inputSizeBytes % L_G722_FRAME_COMPRESSED) != 0)
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return 0;
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if (!output)
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return (inputSizeBytes / L_G722_FRAME_COMPRESSED ) * L_G722_FRAME / 2 * sizeof(short) ;
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while ((inputSizeBytes >= L_G722_FRAME_COMPRESSED) &&
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((*outputSizeBytes - decodedBytes) >= L_G722_FRAME / 2 * sizeof(short))) {
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if (EasyG722_decoder(ctx->handle, (unsigned char*)bitstream, ctx->speach_buffer)) {
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int write_index = 0;
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for(i = 0; i < L_G722_FRAME; i+=2) {
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ctx->speach_buffer[write_index] = ctx->speach_buffer[i];
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write_index++;
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}
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memcpy(speech, ctx->speach_buffer, L_G722_FRAME / 2 * sizeof(short));
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speech += L_G722_FRAME / 2;
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decodedBytes += L_G722_FRAME / 2 * sizeof(short);
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}
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bitstream += L_G722_FRAME_COMPRESSED;
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inputSizeBytes -= L_G722_FRAME_COMPRESSED;
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}
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return decodedBytes;
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}
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