Merge pull request #23 from el-supremo/master

Fix #20

analyze_fft256.cpp

@@ -40,15 +40,14 @@ void AudioAnalyzeFFT256::init(void)
 	//outputflag = false;
 }
 
+// 140312 - PAH - slightly faster copy
 static void copy_to_fft_buffer(void *destination, const void *source)
 {
-	const int16_t *src = (const int16_t *)source;
-	int16_t *dst = (int16_t *)destination;
+	const uint16_t *src = (const uint16_t *)source;
+	uint32_t *dst = (uint32_t *)destination;
 
-	// TODO: optimize this
 	for (int i=0; i < AUDIO_BLOCK_SAMPLES; i++) {
-		*dst++ = *src++;  // real
-		*dst++ = 0;       // imaginary
+		*dst++ = *src++;  // real sample plus a zero for imaginary
 	}
 }
 

filter_fir.cpp

@@ -50,12 +50,12 @@ void AudioFilterFIR::update(void)
   // do passthru
   if(coeff_p == FIR_PASSTHRU) {
     // Just passthrough
-    block = receiveWritable(0);
+    block = receiveReadOnly(0);
     if(block) {
       transmit(block,0);
       release(block);
     }
-    block = receiveWritable(1);
+    block = receiveReadOnly(1);
     if(block) {
       transmit(block,1);
       release(block);
@@ -63,7 +63,7 @@ void AudioFilterFIR::update(void)
     return;
   }
   // Left Channel
-  block = receiveWritable(0);
+  block = receiveReadOnly(0);
   // get a block for the FIR output
   b_new = allocate();
   if(block && b_new) {
@@ -75,7 +75,7 @@ void AudioFilterFIR::update(void)
   if(b_new)release(b_new);
 
   // Right Channel
-  block = receiveWritable(1);
+  block = receiveReadOnly(1);
   b_new = allocate();
   if(block && b_new) {
     arm_fir_q15(&r_fir_inst, (q15_t *)block->data, (q15_t *)b_new->data, AUDIO_BLOCK_SAMPLES);