From 62b3f9a5aa12d59b37199f13efdcd7c202814538 Mon Sep 17 00:00:00 2001
From: Stefan Sayer <stefan.sayer@googlemail.com>
Date: Tue, 18 Mar 2008 01:28:59 +0000
Subject: [PATCH] using spandsp PLC (optional)

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@806 8eb893ce-cfd4-0310-b710-fb5ebe64c474
---
 core/AmRtpAudio.cpp | 22 +++++++++++++++++++---
 core/AmRtpAudio.h   | 13 ++++++++++++-
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/core/AmRtpAudio.cpp b/core/AmRtpAudio.cpp
index 02c47ee9..3477b8a5 100644
--- a/core/AmRtpAudio.cpp
+++ b/core/AmRtpAudio.cpp
@@ -37,6 +37,15 @@ AmRtpAudio::AmRtpAudio(AmSession* _s)
     send_only(false), playout_buffer(new AmPlayoutBuffer(this)),
     last_check(0),last_check_i(false),send_int(false)
 {
+#ifdef USE_SPANDSP_PLC
+  plc_state = plc_init(NULL);
+#endif // USE_SPANDSP_PLC
+}
+
+AmRtpAudio::~AmRtpAudio() {
+#ifdef USE_SPANDSP_PLC
+  plc_release(plc_state);
+#endif // USE_SPANDSP_PLC
 }
 
 bool AmRtpAudio::checkInterval(unsigned int ts, unsigned int frame_size)
@@ -179,27 +188,34 @@ unsigned int AmRtpAudio::default_plc(unsigned char* out_buf,
 {
   short* buf_offset = (short*)out_buf;
 
+#ifdef USE_SPANDSP_PLC
+  plc_fillin(plc_state, buf_offset, PCM16_B2S(size));
+#else
   for(unsigned int i=0; i<(PCM16_B2S(size)/FRAMESZ); i++){
 
     fec.dofe(buf_offset);
     buf_offset += FRAMESZ;
   }
+#endif // USE_SPANDSP_PLC
 
   return PCM16_S2B(buf_offset - (short*)out_buf);
 }
 
 void AmRtpAudio::add_to_history(int16_t *buffer, unsigned int size)
 {
-  int16_t* buf_offset = buffer;
-
   if (!use_default_plc)
     return;
 
-  for(unsigned int i=0; i<(PCM16_B2S(size)/FRAMESZ); i++){
+#ifdef USE_SPANDSP_PLC
+  plc_rx(plc_state, buffer, PCM16_B2S(size));
+#else // USE_SPANDSP_PLC
+  int16_t* buf_offset = buffer;
 
+  for(unsigned int i=0; i<(PCM16_B2S(size)/FRAMESZ); i++){
     fec.addtohistory(buf_offset);
     buf_offset += FRAMESZ;
   }
+#endif // USE_SPANDSP_PLC
 }
 
 void AmRtpAudio::setPlayoutType(PlayoutType type)
diff --git a/core/AmRtpAudio.h b/core/AmRtpAudio.h
index 802540a8..768a0fe2 100644
--- a/core/AmRtpAudio.h
+++ b/core/AmRtpAudio.h
@@ -32,6 +32,11 @@
 #include "AmRtpStream.h"
 #include "LowcFE.h"
 
+#ifdef USE_SPANDSP_PLC
+#include <math.h>
+#include "spandsp/plc.h"
+#endif
+
 class AmPlayoutBuffer;
 
 enum PlayoutType {
@@ -65,7 +70,12 @@ class AmRtpAudio: public AmRtpStream, public AmAudio, public AmPLCBuffer
 {
   auto_ptr<AmPlayoutBuffer> playout_buffer;
 
-  LowcFE       fec;
+#ifdef USE_SPANDSP_PLC
+    plc_state_t* plc_state;
+#else 
+    LowcFE       fec;
+#endif
+
   bool         use_default_plc;
 
   unsigned int last_check;
@@ -84,6 +94,7 @@ class AmRtpAudio: public AmRtpStream, public AmAudio, public AmPLCBuffer
 
 public:
   AmRtpAudio(AmSession* _s=0);
+  ~AmRtpAudio();
 
   bool checkInterval(unsigned int ts, unsigned int frame_size);
   bool sendIntReached();