alc/converter.h

   1 #ifndef CONVERTER_H
   2 #define CONVERTER_H
   3
   4 #include <cstddef>
   5 #include <memory>
   6
   7 #include "AL/al.h"
   8
   9 #include "alcmain.h"
  10 #include "almalloc.h"
  11 #include "alnumeric.h"
  12 #include "alu.h"
  13 #include "devformat.h"
  14 #include "voice.h"
  15
  16
  17 struct SampleConverter {
  18     DevFmtType mSrcType{};
  19     DevFmtType mDstType{};
  20     ALuint mSrcTypeSize{};
  21     ALuint mDstTypeSize{};
  22
  23     int mSrcPrepCount{};
  24
  25     ALuint mFracOffset{};
  26     ALuint mIncrement{};
  27     InterpState mState{};
  28     ResamplerFunc mResample{};
  29
  30     alignas(16) float mSrcSamples[BUFFERSIZE]{};
  31     alignas(16) float mDstSamples[BUFFERSIZE]{};
  32
  33     struct ChanSamples {
  34         alignas(16) float PrevSamples[MAX_RESAMPLER_PADDING];
  35     };
  36     al::FlexArray<ChanSamples> mChan;
  37
  38     SampleConverter(size_t numchans) : mChan{numchans} { }
  39
  40     ALuint convert(const void **src, ALuint *srcframes, void *dst, ALuint dstframes);
  41     ALuint availableOut(ALuint srcframes) const;
  42
  43     DEF_FAM_NEWDEL(SampleConverter, mChan)
  44 };
  45 using SampleConverterPtr = std::unique_ptr<SampleConverter>;
  46
  47 SampleConverterPtr CreateSampleConverter(DevFmtType srcType, DevFmtType dstType, size_t numchans,
  48     ALuint srcRate, ALuint dstRate, Resampler resampler);
  49
  50
  51 struct ChannelConverter {
  52     DevFmtType mSrcType{};
  53     ALuint mSrcStep{};
  54     ALuint mChanMask{};
  55     DevFmtChannels mDstChans{};
  56
  57     bool is_active() const noexcept { return mChanMask != 0; }
  58
  59     void convert(const void *src, float *dst, ALuint frames) const;
  60 };
  61
  62 #endif /* CONVERTER_H */