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-rw-r--r--src/pcm/PcmFormat.cxx39
1 files changed, 38 insertions, 1 deletions
diff --git a/src/pcm/PcmFormat.cxx b/src/pcm/PcmFormat.cxx
index f2d71a6fb..4cabc05a0 100644
--- a/src/pcm/PcmFormat.cxx
+++ b/src/pcm/PcmFormat.cxx
@@ -76,9 +76,46 @@ struct Convert32To16 {
};
template<SampleFormat F, class Traits=SampleTraits<F>>
-struct FloatToInteger
+struct PortableFloatToInteger
: PerSampleConvert<FloatToIntegerSampleConvert<F, Traits>> {};
+template<SampleFormat F, class Traits=SampleTraits<F>>
+struct FloatToInteger : PortableFloatToInteger<F, Traits> {};
+
+/**
+ * A template class that attempts to use the "optimized" algorithm for
+ * large portions of the buffer, and calls the "portable" algorithm"
+ * for the rest when the last block is not full.
+ */
+template<typename Optimized, typename Portable>
+class GlueOptimizedConvert : Optimized, Portable {
+public:
+ typedef typename Portable::SrcTraits SrcTraits;
+ typedef typename Portable::DstTraits DstTraits;
+
+ void Convert(typename DstTraits::pointer_type out,
+ typename SrcTraits::const_pointer_type in,
+ size_t n) const {
+ Optimized::Convert(out, in, n);
+
+ /* use the "portable" algorithm for the trailing
+ samples */
+ size_t remaining = n % Optimized::BLOCK_SIZE;
+ size_t done = n - remaining;
+ Portable::Convert(out + done, in + done, remaining);
+ }
+};
+
+#ifdef __ARM_NEON__
+#include "Neon.hxx"
+
+template<>
+struct FloatToInteger<SampleFormat::S16, SampleTraits<SampleFormat::S16>>
+ : GlueOptimizedConvert<NeonFloatTo16,
+ PortableFloatToInteger<SampleFormat::S16>> {};
+
+#endif
+
template<class C>
static ConstBuffer<typename C::DstTraits::value_type>
AllocateConvert(PcmBuffer &buffer, C convert,