Codec plugin example. The stub for ImTelephone libraries.

(It is not compiled by default.)

svn path=/trunk/; revision=23699

1 files changed, 94 insertions, 0 deletions

diff --git a/plugins/easy_codec/codec-g722.c b/plugins/easy_codec/codec-g722.c
new file mode 100644
index 0000000000..22a56f91ca
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+++ b/plugins/easy_codec/codec-g722.c
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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) {
+  g722_context *ctx = 0;
+
+  ctx = (g722_context*)g_malloc0(sizeof(g722_context));
+  ctx->handle = EasyG722_init_decoder();
+  return ctx;
+}
+
+void codec_g722_release(void *context) {
+  g722_context *ctx = (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) {
+  g722_context *ctx = (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 * sizeof(short);
+
+  while ((inputSizeBytes >= L_G722_FRAME_COMPRESSED) &&
+         ((*outputSizeBytes - decodedBytes) >= L_G722_FRAME * sizeof(short))) {
+    if (EasyG722_decoder(ctx->handle, (unsigned char*)bitstream, ctx->speach_buffer)) {
+      int write_index = 0;
+      
+      for(i = 0; i < L_G722_FRAME * sizeof(short); 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;
+}
+