Tx ph.1: FileSink: set sample source FIFO size depending on sample rate

plugins/samplesink/filesink/filesinkthread.cpp

@@ -88,6 +88,11 @@ void FileSinkThread::setSamplerate(int samplerate)
 			stopWork();
 		}
 
+		// resize sample FIFO
+		if (m_sampleFifo) {
+		    m_sampleFifo->resize(samplerate, samplerate/4); // 1s buffer with 250ms write chunk size
+		}
+
 		m_samplerate = samplerate;
         m_samplesChunkSize = (m_samplerate * m_throttlems) / 1000;
 	}