Add IsFixedBufferSize method in all drivers.

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2636 0c269be4-1314-0410-8aa9-9f06e86f4224

ChangeLog

@@ -21,6 +21,10 @@ Romain Moret
   Jackdmp changes log
 ---------------------------
 
+2008-07-03 Stephane Letz  <letz@grame.fr>
+
+	* Add IsFixedBufferSize method in all drivers.
+
 2008-07-02 Stephane Letz  <letz@grame.fr>
 
 	* New netioadapter in server client.

common/JackDriver.cpp

@@ -275,6 +275,11 @@ int JackDriver::Stop()
     return 0;
 }
 
+bool JackDriver::IsFixedBufferSize()
+{
+    return true;
+}
+
 int JackDriver::SetBufferSize(jack_nframes_t buffer_size)
 {
     return 0;

common/JackDriver.h

@@ -71,6 +71,7 @@ class EXPORT JackDriverInterface
         virtual int Start() = 0;
         virtual int Stop() = 0;
         
+        virtual bool IsFixedBufferSize() = 0;
         virtual int SetBufferSize(jack_nframes_t buffer_size) = 0;
         virtual int SetSampleRate(jack_nframes_t sample_rate) = 0;
         
@@ -163,6 +164,7 @@ class EXPORT JackDriver : public JackDriverClientInterface
         virtual int Start();
         virtual int Stop();
         
+        virtual bool IsFixedBufferSize();
         virtual int SetBufferSize(jack_nframes_t buffer_size);
         virtual int SetSampleRate(jack_nframes_t sample_rate);
         

common/JackDummyDriver.h

@@ -58,6 +58,12 @@ class JackDummyDriver : public JackAudioDriver
 
         int Process();
         
+        // BufferSize can be changed
+        bool IsFixedBufferSize()
+        {
+            return false;
+        }
+
         int SetBufferSize(jack_nframes_t buffer_size);
 
 };

common/JackNetDriver.h

@@ -84,6 +84,12 @@ namespace Jack
 			int Read();
 			int Write();
             
+            // BufferSize can be changed
+            bool IsFixedBufferSize()
+            {
+                return true;
+            }
+
             int SetBufferSize(jack_nframes_t buffer_size)
             {
                 return -1;

common/JackServer.cpp

@@ -193,6 +193,11 @@ int JackServer::SetBufferSize(jack_nframes_t buffer_size)
         jack_log("SetBufferSize: requirement for new buffer size equals current value");
         return 0;
     }
+    
+    if (fAudioDriver->IsFixedBufferSize()) {
+        jack_log("SetBufferSize: driver only supports a fixed buffer size");
+        return 0;
+    }
 
     if (fAudioDriver->Stop() != 0) {
         jack_error("Cannot stop audio driver");

common/JackThreadedDriver.cpp

@@ -101,6 +101,11 @@ int JackThreadedDriver::Write()
     return fDriver->Write();
 }
 
+bool JackThreadedDriver::IsFixedBufferSize()
+{
+    return fDriver->IsFixedBufferSize();
+}
+
 int JackThreadedDriver::SetBufferSize(jack_nframes_t buffer_size)
 {
     return fDriver->SetBufferSize(buffer_size);

common/JackThreadedDriver.h

@@ -70,6 +70,7 @@ class EXPORT JackThreadedDriver : public JackDriverClientInterface, public JackR
         virtual int Start();
         virtual int Stop();
 
+        virtual bool IsFixedBufferSize();
         virtual int SetBufferSize(jack_nframes_t buffer_size);
         virtual int SetSampleRate(jack_nframes_t sample_rate);
      

linux/alsa/JackAlsaDriver.h

@@ -150,6 +150,12 @@ class JackAlsaDriver : public JackAudioDriver
         int Read();
         int Write();
 
+        // BufferSize can be changed
+        bool IsFixedBufferSize()
+        {
+            return false;
+        }
+
         int SetBufferSize(jack_nframes_t nframes);
 
         // jack api emulation for the midi driver

macosx/JackCoreAudioDriver.h

@@ -172,6 +172,12 @@ class JackCoreAudioDriver : public JackAudioDriver
         int Read();
         int Write();
 
+        // BufferSize can be changed
+        bool IsFixedBufferSize()
+        {
+            return false;
+        }
+
         int SetBufferSize(jack_nframes_t buffer_size);
 };