core/converter.h

   1 #ifndef CORE_CONVERTER_H
   2 #define CORE_CONVERTER_H
   3
   4 #include <cstddef>
   5 #include <memory>
   6
   7 #include "almalloc.h"
   8 #include "devformat.h"
   9 #include "mixer/defs.h"
  10
  11 using uint = unsigned int;
  12
  13
  14 struct SampleConverter {
  15     DevFmtType mSrcType{};
  16     DevFmtType mDstType{};
  17     uint mSrcTypeSize{};
  18     uint mDstTypeSize{};
  19
  20     int mSrcPrepCount{};
  21
  22     uint mFracOffset{};
  23     uint mIncrement{};
  24     InterpState mState{};
  25     ResamplerFunc mResample{};
  26
  27     alignas(16) float mSrcSamples[BufferLineSize]{};
  28     alignas(16) float mDstSamples[BufferLineSize]{};
  29
  30     struct ChanSamples {
  31         alignas(16) float PrevSamples[MaxResamplerPadding];
  32     };
  33     al::FlexArray<ChanSamples> mChan;
  34
  35     SampleConverter(size_t numchans) : mChan{numchans} { }
  36
  37     uint convert(const void **src, uint *srcframes, void *dst, uint dstframes);
  38     uint availableOut(uint srcframes) const;
  39
  40     DEF_FAM_NEWDEL(SampleConverter, mChan)
  41 };
  42 using SampleConverterPtr = std::unique_ptr<SampleConverter>;
  43
  44 SampleConverterPtr CreateSampleConverter(DevFmtType srcType, DevFmtType dstType, size_t numchans,
  45     uint srcRate, uint dstRate, Resampler resampler);
  46
  47
  48 struct ChannelConverter {
  49     DevFmtType mSrcType{};
  50     uint mSrcStep{};
  51     uint mChanMask{};
  52     DevFmtChannels mDstChans{};
  53
  54     bool is_active() const noexcept { return mChanMask != 0; }
  55
  56     void convert(const void *src, float *dst, uint frames) const;
  57 };
  58
  59 #endif /* CORE_CONVERTER_H */