adds the option to finish file B while mixing in

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@400 8eb893ce-cfd4-0310-b710-fb5ebe64c474

apps/announcement/Announcement.cpp

@@ -128,7 +128,7 @@ void AnnouncementDialog::startSession(){
 	throw string("AnnouncementDialog::onSessionStart: Cannot open file\n");
     }
 
-    AmAudioMixIn* s = new AmAudioMixIn(&wav_file, f, 4, 0.0);
+    AmAudioMixIn* s = new AmAudioMixIn(&wav_file, f, 4, 0.1, true);
     setOutput(s);
 }
 

apps/examples/mixin_announce/mix_announce.py

@@ -17,7 +17,7 @@ class IvrDialog(IvrDialogBase):
 	        self.beep.open(config['beep'], ivr.AUDIO_READ)
 		
 		self.mixin = IvrAudioMixIn()
-		self.mixin.init(self.announcement, self.beep, 3, 0.6)
+		self.mixin.init(self.announcement, self.beep, 3, 0.6, True)
                 self.enqueue(self.mixin, None)
 
 	def onEmptyQueue(self):

apps/ivr/IvrAudioMixIn.cpp

@@ -35,10 +35,11 @@ static PyObject* IvrAudioMixIn_init(IvrAudioMixIn* self, PyObject* args)
   AmAudioFile* b = NULL;
   int s;
   double l;
+  int finish = 0;
 
   PyObject *o_a, *o_b;
 
-  if(!PyArg_ParseTuple(args,"OOid", &o_a, &o_b, &s, &l))
+  if(!PyArg_ParseTuple(args,"OOid|i", &o_a, &o_b, &s, &l, &finish))
     return NULL;
 
   if (o_a == Py_None) {
@@ -68,7 +69,7 @@ static PyObject* IvrAudioMixIn_init(IvrAudioMixIn* self, PyObject* args)
     delete self->mix;
   }
 
-  self->mix = new AmAudioMixIn(a, b, s, l);
+  self->mix = new AmAudioMixIn(a, b, s, l, finish);
 
   Py_INCREF(Py_None);
   return Py_None;

core/AmAudioMixIn.cpp

@@ -29,8 +29,11 @@
 #include "SampleArray.h"
 
 AmAudioMixIn::AmAudioMixIn(AmAudio* A, AmAudioFile* B, 
-			     unsigned int s, double l) 
-  :   A(A),B(B), s(s), l(l), mixing(false), next_start_ts_i(false)
+			   unsigned int s, double l,
+			   bool finish_b_while_mixing) 
+  :   A(A),B(B), s(s), l(l), 
+      mixing(false), next_start_ts_i(false),
+      finish_b_while_mixing(finish_b_while_mixing)
 {
 }
 AmAudioMixIn::~AmAudioMixIn() { }
@@ -68,7 +71,7 @@ int AmAudioMixIn::get(unsigned int user_ts, unsigned char* buffer,
       // get audio from A
       int len = A->get(user_ts, (unsigned char*)mix_buf, nb_samples);
 
-      if (len<0) { // A finished
+      if ((len<0) && !finish_b_while_mixing) { // A finished
 	return len;
       }
       for (int i=0;i<len;i++) {
@@ -78,8 +81,13 @@ int AmAudioMixIn::get(unsigned int user_ts, unsigned char* buffer,
       res = len;
 
       // clear the rest
-      if (nb_samples<<1 != (unsigned int)len)
-	memset((void*)pdest[len], 0, nb_samples<<1 - (unsigned int)len);
+      unsigned int len_from_a = 0;
+      if (res>0)
+	len_from_a=(unsigned int)res;
+      
+      if (nb_samples<<1 != len_from_a)
+	memset((void*)&pdest[len_from_a>>1], 0, 
+	       nb_samples<<1 - len_from_a);
 
       // add audio from B
       len = B->get(user_ts, (unsigned char*)mix_buf, nb_samples);

core/AmAudioMixIn.h

@@ -50,6 +50,7 @@ class AmAudioMixIn : public AmAudio {
   AmAudioFile* B;
   unsigned int s;
   double l;
+  bool finish_b_while_mixing;
 
   bool mixing;
 
@@ -58,9 +59,11 @@ class AmAudioMixIn : public AmAudio {
 
   short mix_buf[MAX_BUF_SAMPLES];  // 240
 
+
  public:
   AmAudioMixIn(AmAudio* A, AmAudioFile* B, 
-		unsigned int s, double l);
+	       unsigned int s, double l, 
+	       bool finish_b_while_mixing = false);
   ~AmAudioMixIn();
  protected:
   // not used