[Freeswitch-svn] [commit] r2496 - freeswitch/trunk/src/mod/codecs/mod_lpc10

Freeswitch SVN brian at freeswitch.org
Sun Sep 3 22:13:20 EDT 2006


Author: brian
Date: Sun Sep  3 22:13:20 2006
New Revision: 2496

Added:
   freeswitch/trunk/src/mod/codecs/mod_lpc10/
   freeswitch/trunk/src/mod/codecs/mod_lpc10/Makefile
   freeswitch/trunk/src/mod/codecs/mod_lpc10/mod_lpc10.c

Log:
Ok this actually passes the right RTP sizes but no audio.  Work in progress

Added: freeswitch/trunk/src/mod/codecs/mod_lpc10/Makefile
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/codecs/mod_lpc10/Makefile	Sun Sep  3 22:13:20 2006
@@ -0,0 +1,16 @@
+LDFLAGS +=-llpc10
+
+all:	depends $(MODNAME).$(DYNAMIC_LIB_EXTEN)
+
+depends:
+	MAKE=$(MAKE) $(BASE)/build/buildlib.sh $(BASE) install codec/lpc10 --prefix=$(PREFIX)
+
+$(MODNAME).$(DYNAMIC_LIB_EXTEN): $(MODNAME).c ../../../include/switch_bitpack.h
+	$(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_lpc10/mod_lpc10.c
==============================================================================
--- (empty file)
+++ freeswitch/trunk/src/mod/codecs/mod_lpc10/mod_lpc10.c	Sun Sep  3 22:13:20 2006
@@ -0,0 +1,214 @@
+/* 
+ * 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):
+ * 
+ * Brian K. West <brian.west at mac.com>
+ * 
+ *
+ * mod_lpc10.c -- LPC10 Codec Module
+ *
+ */  
+
+#include "switch.h"
+#include "lpc10/lpc10.h"
+
+enum {
+	SamplesPerFrame = 180,
+	BitsPerFrame    = 54,
+	BytesPerFrame   = (BitsPerFrame+7)/8,
+	BitsPerSecond   = 2400
+};
+
+#define   SampleValueScale 32768.0
+#define   MaxSampleValue   32767.0
+#define   MinSampleValue   -32767.0
+
+static const char modname[] = "mod_lpc10";
+
+struct lpc10_context {
+	struct lpc10_encoder_state encoder_object;
+	struct lpc10_decoder_state decoder_object;
+};
+
+static switch_status_t switch_lpc10_init(switch_codec_t *codec, switch_codec_flag_t flags,
+									  const switch_codec_settings_t *codec_settings) 
+{
+	uint32_t encoding, decoding;
+	struct lpc10_context *context = NULL;
+
+	encoding = (flags & SWITCH_CODEC_FLAG_ENCODE);
+	decoding = (flags & SWITCH_CODEC_FLAG_DECODE);
+
+	if (!(encoding || decoding) || (!(context = switch_core_alloc(codec->memory_pool, sizeof(struct lpc10_context))))) {
+		return SWITCH_STATUS_FALSE;
+	} else {
+
+		if (encoding) {
+			init_lpc10_encoder_state(&context->encoder_object);
+		}
+
+		if (decoding) {
+			init_lpc10_decoder_state(&context->decoder_object);
+		}
+
+		codec->private_info = context;
+
+		return SWITCH_STATUS_SUCCESS;
+	}
+}
+
+
+static switch_status_t switch_lpc10_destroy(switch_codec_t *codec) 
+{
+	codec->private_info = NULL;
+	return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t switch_lpc10_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 lpc10_context *context = codec->private_info;
+	int i;
+	INT32 bits[BitsPerFrame];
+	real speech[SamplesPerFrame];
+	short * sampleBuffer = (short *)encoded_data;
+	unsigned char * buffer = (unsigned char *)decoded_data;
+
+
+
+	if (!context) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	for (i = 0; i < SamplesPerFrame; i++)
+		speech[i] = (real)(sampleBuffer[i]/SampleValueScale);
+
+	lpc10_encode(speech, bits, &context->encoder_object);
+
+	memset(encoded_data, 0, BytesPerFrame);
+	for (i = 0; i < BitsPerFrame; i++) {
+		if (bits[i])
+			buffer[i>>3] |= 1 << (i&7);
+	}
+
+	*encoded_data_len = BytesPerFrame;
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t switch_lpc10_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 lpc10_context *context = codec->private_info;
+	int i;
+	INT32 bits[BitsPerFrame];
+	real speech[SamplesPerFrame];
+	short * sampleBuffer = (short *)decoded_data;
+	unsigned char * buffer = (unsigned char *)encoded_data;
+
+	if (!context) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	for (i = 0; i < BitsPerFrame; i++)
+		bits[i] = (buffer[i>>3]&(1<<(i&7))) != 0;
+
+	lpc10_decode(bits, speech, &context->decoder_object);
+
+	for (i = 0; i < SamplesPerFrame; i++) {
+		real sample = (real)(speech[i]*SampleValueScale);
+		if (sample < MinSampleValue)
+			sample = MinSampleValue;
+		else if (sample > MaxSampleValue)
+			sample = MaxSampleValue;
+		sampleBuffer[i] = (short)sample;
+	}
+
+	*decoded_data_len = SamplesPerFrame*2;
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
+/* Registration */ 
+
+static const switch_codec_implementation_t lpc10_implementation = { 
+	/*.codec_type */ SWITCH_CODEC_TYPE_AUDIO, 
+	/*.ianacode */ 7, 
+	/*.iananame */ "LPC", 
+	/*.samples_per_second */ 8000,
+	/*.bits_per_second */ 240, 
+	/*.microseconds_per_frame */ 22500, 
+	/*.samples_per_frame */ 180, 
+	/*.bytes_per_frame */ 360, 
+	/*.encoded_bytes_per_frame */ 7, 
+	/*.number_of_channels */ 1, 
+	/*.pref_frames_per_packet */ 1, 
+	/*.max_frames_per_packet */ 1, 
+	/*.init */ switch_lpc10_init, 
+	/*.encode */ switch_lpc10_encode, 
+	/*.decode */ switch_lpc10_decode, 
+	/*.destroy */ switch_lpc10_destroy, 
+};
+
+const switch_codec_interface_t lpc10_codec_interface = { 
+	/*.interface_name */ "LPC-10 2.4kbps", 
+	/*.implementations */ &lpc10_implementation, 
+};
+
+static switch_loadable_module_interface_t lpc10_module_interface = { 
+	/*.module_name */ modname, 
+	/*.endpoint_interface */ NULL, 
+	/*.timer_interface */ NULL, 
+	/*.dialplan_interface */ NULL, 
+	/*.codec_interface */ &lpc10_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 = &lpc10_module_interface;
+
+	/* indicate that the module should continue to be loaded */ 
+	return SWITCH_STATUS_SUCCESS;
+}



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