g.722 codec from spandsp in 8khz compatibility mode

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@1033 8eb893ce-cfd4-0310-b710-fb5ebe64c474

core/amci/codecs.h

@@ -53,4 +53,6 @@
 #define CODEC_G726_40 11
 
 #define CODEC_L16     12
+
+#define CODEC_G722_NB 13
 #endif

core/plug-in/Makefile

@@ -1,6 +1,6 @@
 include ../../Makefile.defs
 
-exclude_modules ?= 
+exclude_modules ?= g722
 #echo
 
 modules = $(filter-out $(subst ;, ,$(exclude_modules)) \

core/plug-in/g722/Makefile

@@ -0,0 +1,14 @@
+plug_in_name = g722
+
+SPANDSP_INC=
+#/usr/include/
+SPANDSP_LIB = -lspandsp
+
+module_ldflags = $(SPEEX_LIB)
+module_cflags  = -ansi # -DNOFPU
+
+ifdef NOFPU
+	module_cflags += -DNOFPU
+endif
+
+include ../Makefile.audio_module

core/plug-in/g722/Readme.g722codec

@@ -0,0 +1,10 @@
+This is a wrapper around the g722 codec from the spandsp library.
+
+G.722 is an ADPCM wideband (16khz) codec. Here the NB compatibility 
+mode is used - it is decoded in and encoded from 8khz.
+
+See  
+http://www.soft-switch.org/spandsp-modules.html 
+ and 
+http://www.soft-switch.org/spandsp-doc/g722_page.html
+for details about spandsp.

core/plug-in/g722/g722.c

@@ -0,0 +1,148 @@
+/*
+  This is a simple interface to the spandsp's g722 implementation.
+  This uses the 8khz compatibility mode - audio is encodec and decoded 
+  in 8khz.
+
+  Copyright (C) 2008 iptego GmbH 
+
+  This code is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation.
+  
+  This code 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
+  Lesser General Public License for more details.
+  
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "amci.h"
+#include "codecs.h"
+#include <math.h>
+typedef unsigned char uint8_t;
+typedef signed short int16_t;
+
+#include "spandsp/g722.h"
+#include "../../log.h"
+
+
+int Pcm16_2_G722NB( unsigned char* out_buf, unsigned char* in_buf, unsigned int size,
+		     unsigned int channels, unsigned int rate, long h_codec );
+int G722NB_2_Pcm16( unsigned char* out_buf, unsigned char* in_buf, unsigned int size,
+		     unsigned int channels, unsigned int rate, long h_codec );
+
+long G722NB_create(const char* format_parameters, amci_codec_fmt_info_t* format_description);
+void G722NB_destroy(long handle);
+
+static unsigned int G722NB_bytes2samples(long, unsigned int);
+static unsigned int G722NB_samples2bytes(long, unsigned int);
+
+BEGIN_EXPORTS("g722", AMCI_NO_MODULEINIT, AMCI_NO_MODULEDESTROY)
+
+BEGIN_CODECS
+CODEC(CODEC_G722_NB, Pcm16_2_G722NB, G722NB_2_Pcm16, AMCI_NO_CODEC_PLC, 
+      G722NB_create, G722NB_destroy, 
+      G722NB_bytes2samples, G722NB_samples2bytes)
+END_CODECS
+  
+BEGIN_PAYLOADS
+PAYLOAD(9, "g722", 8000, 1, CODEC_G722_NB, AMCI_PT_AUDIO_FRAME)
+END_PAYLOADS
+  
+BEGIN_FILE_FORMATS
+END_FILE_FORMATS
+
+END_EXPORTS
+
+typedef struct {
+  g722_encode_state_t encode_state;
+  g722_decode_state_t decode_state;    
+} G722State;
+
+
+long G722NB_create(const char* format_parameters, amci_codec_fmt_info_t* format_description)
+{
+  G722State* gs;
+        
+  gs = (G722State*) calloc(1, sizeof(G722State));
+  if (!gs) {
+    ERROR("error allocating memory for G722 codec state\n");
+    return 0;
+  }
+
+  if (!g722_encode_init(&gs->encode_state, 
+			64000, G722_SAMPLE_RATE_8000)) {
+    ERROR("error initializing G722 encoder\n");
+    free(gs);
+    return 0;
+  }
+
+  if (!g722_decode_init(&gs->decode_state, 
+			64000, G722_SAMPLE_RATE_8000)) {
+    ERROR("error initializing G722 decoder\n");
+    free(gs);
+    return 0;
+  }
+
+  return (long)gs;
+}
+
+void G722NB_destroy(long handle)
+{
+}
+
+static unsigned int G722NB_bytes2samples(long h_codec, unsigned int num_bytes) {
+  return  num_bytes;
+}
+
+static unsigned int G722NB_samples2bytes(long h_codec, unsigned int num_samples) {
+  return num_samples;
+}
+
+
+int Pcm16_2_G722NB( unsigned char* out_buf, unsigned char* in_buf, unsigned int size,
+		    unsigned int channels, unsigned int rate, long h_codec )
+{
+  G722State* gs;
+
+  if (channels!=1) {
+    ERROR("only supports 1 channel\n");
+    return 0;
+  }
+
+  if (rate != 8000) {
+    ERROR("only supports NB (8khz)\n");
+    return 0;
+  }
+
+  gs = (G722State*) h_codec;
+
+  return g722_encode(&gs->encode_state, out_buf, (signed short*)in_buf, size >> 1);
+}
+
+int G722NB_2_Pcm16( unsigned char* out_buf, unsigned char* in_buf, unsigned int size,
+		     unsigned int channels, unsigned int rate, long h_codec )
+{
+
+  G722State* gs;
+
+  if (channels!=1) {
+    ERROR("only supports 1 channel\n");
+    return 0;
+  }
+
+  if (rate != 8000) {
+    ERROR("only supports NB (8khz)\n");
+    return 0;
+  }
+
+  gs = (G722State*) h_codec;
+
+  return g722_decode(&gs->decode_state, (signed short*)out_buf, in_buf, size) << 1;
+}