Another case where extra deinterleaving isn't necessary. CopySamples() can do

the job quite nicely...well, given the "stride" information he needs.  And in
some cases, it will just use memcpy() so it may improve capture performance a
bit more.

src/RingBuffer.cpp

@@ -53,7 +53,7 @@ int RingBuffer::AvailForPut()
 }
 
 int RingBuffer::Put(samplePtr buffer, sampleFormat format,
-                    int samplesToCopy)
+                    int samplesToCopy, int stride /* = 1 */)
 {
    samplePtr src;
    int block;
@@ -75,7 +75,7 @@ int RingBuffer::Put(samplePtr buffer, sampleFormat format,
       
       CopySamples(src, format,
                   mBuffer + pos * SAMPLE_SIZE(mFormat), mFormat,
-                  block);
+                  block, true, stride);
 
       src += block * SAMPLE_SIZE(format);
       pos = (pos + block) % mBufferSize;