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
  15
  16 struct SampleConverter {
  17     DevFmtType mSrcType{};
  18     DevFmtType mDstType{};
  19     ALuint mSrcTypeSize{};
  20     ALuint mDstTypeSize{};
  21
  22     ALint mSrcPrepCount{};
  23
  24     ALuint mFracOffset{};
  25     ALuint mIncrement{};
  26     InterpState mState{};
  27     ResamplerFunc mResample{};
  28
  29     alignas(16) ALfloat mSrcSamples[BUFFERSIZE]{};
  30     alignas(16) ALfloat mDstSamples[BUFFERSIZE]{};
  31
  32     struct ChanSamples {
  33         alignas(16) ALfloat PrevSamples[MAX_RESAMPLER_PADDING];
  34     };
  35     al::FlexArray<ChanSamples> mChan;
  36
  37     SampleConverter(size_t numchans) : mChan{numchans} { }
  38
  39     ALuint convert(const ALvoid **src, ALuint *srcframes, ALvoid *dst, ALuint dstframes);
  40     ALuint availableOut(ALuint srcframes) const;
  41
  42     DEF_FAM_NEWDEL(SampleConverter, mChan)
  43 };
  44 using SampleConverterPtr = std::unique_ptr<SampleConverter>;
  45
  46 SampleConverterPtr CreateSampleConverter(DevFmtType srcType, DevFmtType dstType, size_t numchans,
  47     ALuint srcRate, ALuint dstRate, Resampler resampler);
  48
  49
  50 struct ChannelConverter {
  51     DevFmtType mSrcType;
  52     DevFmtChannels mSrcChans;
  53     DevFmtChannels mDstChans;
  54
  55     bool is_active() const noexcept { return mSrcChans != mDstChans; }
  56
  57     void convert(const ALvoid *src, ALfloat *dst, ALuint frames) const;
  58 };
  59
  60 #endif /* CONVERTER_H */