c@10: 
c@10: module cqt;
c@10: 
c@10: cqtkernel = load cqtkernel;
c@10: resample = load may.stream.resample;
c@10: manipulate = load may.stream.manipulate;
c@10: syn = load may.stream.syntheticstream;
c@10: cm = load may.matrix.complex;
c@10: mat = load may.matrix;
c@10: framer = load may.stream.framer;
c@10: cplx = load may.complex;
c@10: fft = load may.transform.fft;
c@10: vec = load may.vector;
c@10: 
c@10: { pow, round, floor, ceil, log2, nextPowerOfTwo } = load may.mathmisc;
c@10: 
c@10: cqt str =
c@10:    (sampleRate = str.sampleRate;
c@10:     maxFreq = sampleRate/2;
c@10:     minFreq = 40;
c@10:     binsPerOctave = 24;
c@10: 
c@10: println "Here";
c@10: 
c@10:     octaves = ceil (log2 (maxFreq / minFreq));
c@10: 
c@10: println "Here: about to calculate stuff with \(octaves)";
c@10: 
c@10:     actualMinFreq = (maxFreq / (pow 2 octaves)) * (pow 2 (1/binsPerOctave));
c@10: 
c@10:     println "sampleRate = \(sampleRate), maxFreq = \(maxFreq), minFreq = \(minFreq), actualMinFreq = \(actualMinFreq), octaves = \(octaves), binsPerOctave = \(binsPerOctave)";
c@10: 
c@10:     kdata = cqtkernel.makeKernel { sampleRate, maxFreq, binsPerOctave };
c@10: 
c@11:     println "atomsPerFrame = \(kdata.atomsPerFrame)";
c@11: 
c@10:     streams = manipulate.duplicated octaves str;
c@10: 
c@10:     //!!! can't be right!
c@10:     kernel = cm.transposed (cm.conjugateTransposed kdata.kernel);
c@10: 
c@10:     println "have kernel";
c@10: 
c@10:     fftFunc = fft.forward kdata.fftSize;
c@10: 
c@10:     cqblocks =
c@10:         map do octave:
c@10:             frames = framer.monoFrames //!!! mono for now
c@10:                 { framesize = kdata.fftSize, hop = kdata.fftHop }
c@10:                 (resample.decimated (pow 2 octave) streams[octave]);
c@10:             map do frame:
c@10:                 freq = fftFunc (cplx.complexArray frame (vec.zeros kdata.fftSize));
c@10:                 cm.product kernel (cm.newComplexColumnVector freq);
c@10:             done frames;
c@10:         done [0..octaves-1];
c@10: 
c@13:     // The cqblocks list is a list<list<matrix>>. Each top-level list
c@11:     // corresponds to an octave, from highest to lowest, each having
c@11:     // twice as many elements in its list as the next octave. The
c@11:     // sub-lists are sampled in time with an effective spacing of
c@11:     // fftSize * 2^(octave-1) audio frames, and the matrices are row
c@11:     // vectors with atomsPerFrame * binsPerOctave complex elements.
c@13:     //
c@13:     // ***
c@13:     // 
c@13:     // In a typical constant-Q structure, each (2^(octaves-1) *
c@13:     // fftHop) input frames gives us an output structure conceptually
c@13:     // like this:
c@10:     //
c@10:     // [][][][][][][][]   <- fftHop frames per highest-octave output value
c@10:     // [][][][][][][][]      layered as many times as binsPerOctave (here 2)
c@10:     // [--][--][--][--]   <- fftHop*2 frames for the next lower octave
c@10:     // [--][--][--][--]      etc
c@10:     // [------][------]
c@10:     // [------][------]
c@10:     // [--------------]
c@10:     // [--------------]
c@10:     //
c@13:     // ***
c@13:     //
c@13:     // But the kernel we're using here has more than one temporally
c@13:     // spaced atom; each individual cell is a row vector with
c@13:     // atomsPerFrame * binsPerOctave elements, but that actually
c@13:     // represents a rectangular matrix of result cells with width
c@13:     // atomsPerFrame and height binsPerOctave. The columns of this
c@13:     // matrix (the atoms) then need to be spaced by 2^(octave-1)
c@13:     // relative to those from the highest octave.
c@10: 
c@13:     cqblocks
c@10:     );
c@10: 
c@10: testStream = manipulate.withDuration 96000 (syn.sinusoid 48000 500);
c@10: 
c@10: println "have test stream";
c@10: 
c@10: cqt testStream;
c@10: 
c@10: 
c@10: