1 files changed, 71 insertions, 0 deletions
diff --git a/core/bformatdec.h b/core/bformatdec.h
new file mode 100644
index 00000000..a0ae3f27
--- /dev/null
+++ b/core/bformatdec.h
@@ -0,0 +1,71 @@
+#ifndef CORE_BFORMATDEC_H
+#define CORE_BFORMATDEC_H
+
+#include <array>
+#include <cstddef>
+#include <memory>
+
+#include "almalloc.h"
+#include "alspan.h"
+#include "ambidefs.h"
+#include "bufferline.h"
+#include "devformat.h"
+#include "filters/splitter.h"
+
+struct AmbDecConf;
+struct FrontStablizer;
+
+
+using ChannelDec = std::array<float,MaxAmbiChannels>;
+
+class BFormatDec {
+    static constexpr size_t sHFBand{0};
+    static constexpr size_t sLFBand{1};
+    static constexpr size_t sNumBands{2};
+
+    struct ChannelDecoder {
+        union MatrixU {
+            float Dual[sNumBands][MAX_OUTPUT_CHANNELS];
+            float Single[MAX_OUTPUT_CHANNELS];
+        } mGains{};
+
+        /* NOTE: BandSplitter filter is unused with single-band decoding. */
+        BandSplitter mXOver;
+    };
+
+    alignas(16) std::array<FloatBufferLine,2> mSamples;
+
+    const std::unique_ptr<FrontStablizer> mStablizer;
+    const bool mDualBand{false};
+
+    al::FlexArray<ChannelDecoder> mChannelDec;
+
+public:
+    BFormatDec(const AmbDecConf *conf, const bool allow_2band, const size_t inchans,
+        const uint srate, const uint (&chanmap)[MAX_OUTPUT_CHANNELS],
+        std::unique_ptr<FrontStablizer> stablizer);
+    BFormatDec(const size_t inchans, const al::span<const ChannelDec> coeffs,
+        const al::span<const ChannelDec> coeffslf, std::unique_ptr<FrontStablizer> stablizer);
+
+    bool hasStablizer() const noexcept { return mStablizer != nullptr; };
+
+    /* Decodes the ambisonic input to the given output channels. */
+    void process(const al::span<FloatBufferLine> OutBuffer, const FloatBufferLine *InSamples,
+        const size_t SamplesToDo);
+
+    /* Decodes the ambisonic input to the given output channels with stablization. */
+    void processStablize(const al::span<FloatBufferLine> OutBuffer,
+        const FloatBufferLine *InSamples, const size_t lidx, const size_t ridx, const size_t cidx,
+        const size_t SamplesToDo);
+
+    static std::unique_ptr<BFormatDec> Create(const AmbDecConf *conf, const bool allow_2band,
+        const size_t inchans, const uint srate, const uint (&chanmap)[MAX_OUTPUT_CHANNELS],
+        std::unique_ptr<FrontStablizer> stablizer);
+    static std::unique_ptr<BFormatDec> Create(const size_t inchans,
+        const al::span<const ChannelDec> coeffs, const al::span<const ChannelDec> coeffslf,
+        std::unique_ptr<FrontStablizer> stablizer);
+
+    DEF_FAM_NEWDEL(BFormatDec, mChannelDec)
+};
+
+#endif /* CORE_BFORMATDEC_H */