[Freeswitch-svn] [commit] r2441 - freeswitch/trunk/src/mod/codecs/mod_amr

Freeswitch SVN brian at freeswitch.org
Wed Aug 30 00:04:47 EDT 2006


Author: brian
Date: Wed Aug 30 00:04:47 2006
New Revision: 2441

Added:
   freeswitch/trunk/src/mod/codecs/mod_amr/
   freeswitch/trunk/src/mod/codecs/mod_amr/Makefile
   freeswitch/trunk/src/mod/codecs/mod_amr/mod_amr.c

Log:
Work in progress

Added: freeswitch/trunk/src/mod/codecs/mod_amr/Makefile
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/codecs/mod_amr/Makefile	Wed Aug 30 00:04:47 2006
@@ -0,0 +1,16 @@
+CFLAGS += -I$(PREFIX)/include/amr
+LDFLAGS +=-lamr
+
+all:	$(MODNAME).$(DYNAMIC_LIB_EXTEN)
+
+depends:
+
+$(MODNAME).$(DYNAMIC_LIB_EXTEN): $(MODNAME).c
+	$(CC) $(CFLAGS) -fPIC -c $(MODNAME).c -o $(MODNAME).o
+	$(CC) $(SOLINK) $(MODNAME).o -o $(MODNAME).$(DYNAMIC_LIB_EXTEN) $(LDFLAGS)
+
+clean:
+	rm -fr *.$(DYNAMIC_LIB_EXTEN) *.o *~
+
+install:
+	cp -f $(MODNAME).$(DYNAMIC_LIB_EXTEN) $(PREFIX)/mod

Added: freeswitch/trunk/src/mod/codecs/mod_amr/mod_amr.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/codecs/mod_amr/mod_amr.c	Wed Aug 30 00:04:47 2006
@@ -0,0 +1,199 @@
+/* 
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2005/2006, Anthony Minessale II <anthmct at 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 at yahoo.com>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * 
+ * Anthony Minessale II <anthmct at yahoo.com>
+ * Brian K. West <brian.west at mac.com>
+ *
+ * mod_amr.c -- GSM-AMR Codec Module
+ *
+ */  
+#include "switch.h"
+#include "amr.h"
+
+static const char modname[] = "mod_amr";
+
+struct amr_context {
+	void *encoder_state;
+	int mode;
+};
+
+enum
+	{
+		GENERIC_PARAMETER_AMR_MAXAL_SDUFRAMES = 0,
+		GENERIC_PARAMETER_AMR_BITRATE,
+		GENERIC_PARAMETER_AMR_GSMAMRCOMFORTNOISE,
+		GENERIC_PARAMETER_AMR_GSMEFRCOMFORTNOISE,
+		GENERIC_PARAMETER_AMR_IS_641COMFORTNOISE,
+		GENERIC_PARAMETER_AMR_PDCEFRCOMFORTNOISE
+	};
+
+enum
+	{
+		AMR_BITRATE_475 = 0,
+		AMR_BITRATE_515,
+		AMR_BITRATE_590,
+		AMR_BITRATE_670,
+		AMR_BITRATE_740,
+		AMR_BITRATE_795,
+		AMR_BITRATE_1020,
+		AMR_BITRATE_1220
+	};
+
+//static short bytes_per_frame[16]={ 13, 14, 16, 18, 19, 21, 26, 31, 6, 0, 0, 0, 0, 0, 0, 0 };
+
+#define AMR_Mode  7
+
+static switch_status_t switch_amr_init(switch_codec_t *codec, switch_codec_flag_t flags,
+									  const switch_codec_settings_t *codec_settings) 
+{
+	struct amr_context *context = NULL;
+	int encoding, decoding;
+
+	encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
+	decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
+
+	if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(struct amr_context))))) {
+		return SWITCH_STATUS_FALSE;
+	} else {
+
+		context->mode = AMR_Mode;
+
+		if (encoding) {
+			context->encoder_state = Encoder_Interface_init(0);
+		}
+
+		if (decoding) {
+			Decoder_Interface_init();
+		}
+
+		codec->private_info = context;
+
+		return SWITCH_STATUS_SUCCESS;
+	}
+}
+
+static switch_status_t switch_amr_destroy(switch_codec_t *codec) 
+{
+	struct amr_context *context = codec->private_info;
+	Encoder_Interface_exit(context->encoder_state);
+	Decoder_Interface_exit(context->encoder_state);
+	codec->private_info = NULL;
+	return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t switch_amr_encode(switch_codec_t *codec, 
+										switch_codec_t *other_codec, 
+										void *decoded_data,
+
+										uint32_t decoded_data_len, 
+										uint32_t decoded_rate, 
+										void *encoded_data,
+
+										uint32_t *encoded_data_len, 
+										uint32_t *encoded_rate, 
+										unsigned int *flag) 
+{
+	struct amr_context *context = codec->private_info;
+	
+	if (!context) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	*encoded_data_len = Encoder_Interface_Encode(context->encoder_state, context->mode, (void *)decoded_data, encoded_data, 0);
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t switch_amr_decode(switch_codec_t *codec, 
+										switch_codec_t *other_codec, 
+										void *encoded_data,
+
+										uint32_t encoded_data_len, 
+										uint32_t encoded_rate, 
+										void *decoded_data,
+
+										uint32_t *decoded_data_len, 
+										uint32_t *decoded_rate, 
+										unsigned int *flag) 
+{
+	struct amr_context *context = codec->private_info;
+	
+	context->mode = *(char *)encoded_data & 0xF;
+
+	if (!context) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	Decoder_Interface_Decode( context, (void *)encoded_data, (void *)decoded_data, 0 );
+
+	*decoded_data_len = codec->implementation->samples_per_frame;
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
+/* Registration */ 
+
+static const switch_codec_implementation_t amr_implementation = { 
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
+	/*.ianacode */ 118, 
+	/*.iananame */ "AMR", 
+	/*.samples_per_second */ 8000, 
+	/*.bits_per_second */ 0, 
+	/*.microseconds_per_frame */ 20000, 
+	/*.samples_per_frame */ 160, 
+	/*.bytes_per_frame */ 0, 
+	/*.encoded_bytes_per_frame */ 0, 
+	/*.number_of_channels */ 1, 
+	/*.pref_frames_per_packet */ 1, 
+	/*.max_frames_per_packet */ 1, 
+	/*.init */ switch_amr_init, 
+	/*.encode */ switch_amr_encode, 
+	/*.decode */ switch_amr_decode, 
+	/*.destroy */ switch_amr_destroy, 
+};
+
+static const switch_codec_interface_t amr_codec_interface = { 
+	/*.interface_name */ "GSM-AMR", 
+	/*.implementations */ &amr_implementation, 
+};
+
+static switch_loadable_module_interface_t amr_module_interface = { 
+	/*.module_name */ modname, 
+	/*.endpoint_interface */ NULL, 
+	/*.timer_interface */ NULL, 
+	/*.dialplan_interface */ NULL, 
+	/*.codec_interface */ &amr_codec_interface, 
+	/*.application_interface */ NULL 
+};
+
+SWITCH_MOD_DECLARE(switch_status_t) switch_module_load(const switch_loadable_module_interface_t **module_interface,
+													 char *filename)
+{
+	/* connect my internal structure to the blank pointer passed to me */ 
+	*module_interface = &amr_module_interface;
+
+	/* indicate that the module should continue to be loaded */ 
+	return SWITCH_STATUS_SUCCESS;
+}



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