Fix for RPi 1 Stereo output

src/minidexed.cpp

@@ -273,11 +273,7 @@ bool CMiniDexed::Initialize (void)
 		return false;
 	}
 
-#ifndef ARM_ALLOW_MULTI_CORE
-	m_pSoundDevice->SetWriteFormat (SoundFormatSigned16, 1);	// 16-bit Mono
-#else
 	m_pSoundDevice->SetWriteFormat (SoundFormatSigned16, 2);	// 16-bit Stereo
-#endif
 
 	m_nQueueSizeFrames = m_pSoundDevice->GetQueueSizeFrames ();
 
@@ -1314,15 +1310,47 @@ void CMiniDexed::ProcessSound (void)
 		m_InsertFX[0]->process(SampleBuffer[0], SampleBuffer[0], SampleBuffer[0], SampleBuffer[1], nFrames);
 		m_InsertFXSpinLock[0]->Release();
 
+		uint8_t indexL=0, indexR=1;
+
+		reverb_send_mixer->doAddMix(0, SampleBuffer[indexL], SampleBuffer[indexR]);
+		
+		float32_t ReverbBuffer[2][nFrames];
+		float32_t ReverbSendBuffer[2][nFrames];
+
+		arm_fill_f32(0.0f, ReverbBuffer[indexL], nFrames);
+		arm_fill_f32(0.0f, ReverbBuffer[indexR], nFrames);
+		arm_fill_f32(0.0f, ReverbSendBuffer[indexR], nFrames);
+		arm_fill_f32(0.0f, ReverbSendBuffer[indexL], nFrames);
+
+		m_SendFXSpinLock.Acquire ();
+		
+		reverb_send_mixer->getMix(ReverbSendBuffer[indexL], ReverbSendBuffer[indexR]);
+		m_SendFX->process(ReverbSendBuffer[indexL], ReverbSendBuffer[indexR], ReverbBuffer[indexL], ReverbBuffer[indexR], nFrames);
+
+		// scale down and add left reverb buffer by reverb level 
+		arm_scale_f32(ReverbBuffer[indexL], m_SendFXLevel, ReverbBuffer[indexL], nFrames);
+		arm_add_f32(SampleBuffer[indexL], ReverbBuffer[indexL], SampleBuffer[indexL], nFrames);
+		// scale down and add right reverb buffer by reverb level 
+		arm_scale_f32(ReverbBuffer[indexR], m_SendFXLevel, ReverbBuffer[indexR], nFrames);
+		arm_add_f32(SampleBuffer[indexR], ReverbBuffer[indexR], SampleBuffer[indexR], nFrames);
+
+		m_SendFXSpinLock.Release ();
+
+		// swap stereo channels if needed prior to writing back out
+		if (m_bChannelsSwapped)
+		{
+			indexL=1;
+			indexR=0;
+		}
+
 		// Convert dual float array (left, right) to single int16 array (left/right)
 		float32_t tmp_float[nFrames*2];
+		int16_t tmp_int[nFrames*2];
 		for(uint16_t i=0; i<nFrames;i++)
 		{
-			tmp_float[i*2]=SampleBuffer[0][i];
-			tmp_float[(i*2)+1]=SampleBuffer[1][i];
+			tmp_float[i*2]=SampleBuffer[indexL][i];
+			tmp_float[(i*2)+1]=SampleBuffer[indexR][i];
 		}
-		// Convert single float array (mono) to int16 array
-		int16_t tmp_int[nFrames];
 		arm_float_to_q15(tmp_float,tmp_int,nFrames*2);
 
 		if (m_pSoundDevice->Write (tmp_int, sizeof(tmp_int)) != (int) sizeof(tmp_int))