add md of the db dir to msvc build process. Add yet to be completed gsm codec.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@203 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/codec/mod_codec_gsm/mod_codec_gsm.c

@@ -0,0 +1,175 @@
+/* 
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2005/2006, Anthony Minessale II <anthmct@yahoo.com>
+ *
+ * Version: MPL 1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ *
+ * The Initial Developer of the Original Code is
+ * Anthony Minessale II <anthmct@yahoo.com>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * 
+ * Anthony Minessale II <anthmct@yahoo.com>
+ * Michael Jerris <mike@jerris.com>
+ *
+ * mod_codec_gsm.c -- gsm Codec Module
+ *
+ */
+#include "switch.h"
+#include "gsm.h"
+
+static const char modname[] = "mod_codec_gsm";
+
+
+static switch_status switch_gsm_init(switch_codec *codec, switch_codec_flag flags, const struct switch_codec_settings *codec_settings)
+{
+	gsm context;
+	int encoding, decoding;
+	
+	encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
+	decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
+	
+	if (!(encoding || decoding)) {
+		return SWITCH_STATUS_FALSE;
+	} else {
+			context = gsm_create();
+		}
+
+		codec->private = context;
+		
+		return SWITCH_STATUS_SUCCESS;
+	
+}
+
+static switch_status switch_gsm_destroy(switch_codec *codec)
+{
+	gsm_destroy((gsm)codec->private);
+	codec->private = NULL;
+	return SWITCH_STATUS_SUCCESS;
+}
+
+
+static switch_status switch_gsm_encode(switch_codec *codec,
+								   switch_codec *other_codec,
+								   void *decoded_data,
+								   size_t decoded_data_len,
+								   void *encoded_data,
+								   size_t *encoded_data_len,
+								   unsigned int *flag)
+{
+	gsm context = codec->private;
+	int cbret = 0;
+
+	if (!context) {
+		return SWITCH_STATUS_FALSE;
+	}
+	gsm_encode(context, (void *)decoded_data, (void *)encoded_data);
+	*encoded_data_len = 33;
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
+
+static switch_status switch_gsm_decode(switch_codec *codec,
+								   switch_codec *other_codec,
+								   void *encoded_data,
+								   size_t encoded_data_len,
+								   void *decoded_data,
+								   size_t *decoded_data_len,
+								   unsigned int *flag) 
+{
+	struct gsm_context *context = codec->private;
+	
+	if (!context) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+
+	if (encoded_data_len % 33 == 0) {
+		int loops = (int) encoded_data_len / 33;
+		char *edp = encoded_data;
+		short *ddp = decoded_data;
+		int x;
+		unsigned int new_len = 0;
+		for(x = 0; x < loops && new_len < *decoded_data_len; x++) {
+			gsm_decode(&context, ddp, edp, 33);
+			ddp += 80;
+			edp += 10;
+			new_len += 320;
+		}
+		if (new_len <= *decoded_data_len) {
+			*decoded_data_len = new_len;
+		} else {
+			switch_console_printf(SWITCH_CHANNEL_CONSOLE, "buffer overflow!!!\n");
+			return SWITCH_STATUS_FALSE;
+		}
+	} else {
+		switch_console_printf(SWITCH_CHANNEL_CONSOLE, "yo this frame is an odd size [%d]\n", encoded_data_len);
+	}
+	
+	
+	return SWITCH_STATUS_SUCCESS;
+}
+
+/* Registration */
+
+static const switch_codec_implementation gsm_8k_implementation = {
+	/*.samples_per_second*/				8000,
+	/*.bits_per_second*/				13200,
+	/*.microseconds_per_frame*/			20000,
+	/*.samples_per_frame*/				160,
+	/*.bytes_per_frame*/				320,
+	/*.encoded_bytes_per_frame*/		33,
+	/*.number_of_channels*/				1,
+	/*.pref_frames_per_packet*/			1,
+	/*.max_frames_per_packet*/			7,
+	/*.init*/							switch_gsm_init,
+	/*.encode*/							switch_gsm_encode,
+	/*.decode*/							switch_gsm_decode,
+	/*.destroy*/						switch_gsm_destroy,
+};
+
+static const switch_codec_interface gsm_codec_interface = {
+	/*.interface_name*/					"gsm",
+	/*.codec_type*/						SWITCH_CODEC_TYPE_AUDIO,
+	/*.ianacode*/						3,
+	/*.iananame*/						"gsm",
+	/*.implementations*/				&gsm_8k_implementation,
+};
+
+static switch_loadable_module_interface gsm_module_interface = {
+	/*.module_name*/					modname,
+	/*.endpoint_interface*/				NULL,
+	/*.timer_interface*/				NULL,
+	/*.dialplan_interface*/				NULL,
+	/*.codec_interface*/				&gsm_codec_interface,
+	/*.application_interface*/			NULL
+};
+
+
+SWITCH_MOD_DECLARE(switch_status) switch_module_load(const switch_loadable_module_interface **interface, char *filename) {
+	/* connect my internal structure to the blank pointer passed to me */
+	*interface = &gsm_module_interface;
+
+	/* indicate that the module should continue to be loaded */
+	return SWITCH_STATUS_SUCCESS;
+}
+
+
+
+
+