/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Rubber Band
    An audio time-stretching and pitch-shifting library.
    Copyright 2007-2011 Chris Cannam.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "StretcherChannelData.h"

#include "dsp/Resampler.h"

#include "system/Allocators.h"

namespace RubberBand 
{
      
RubberBandStretcher::Impl::ChannelData::ChannelData(size_t windowSize,
                                                    size_t fftSize,
                                                    size_t outbufSize)
{
    std::set<size_t> s;
    construct(s, windowSize, fftSize, outbufSize);
}

RubberBandStretcher::Impl::ChannelData::ChannelData(const std::set<size_t> &sizes,
                                                    size_t initialWindowSize,
                                                    size_t initialFftSize,
                                                    size_t outbufSize)
{
    construct(sizes, initialWindowSize, initialFftSize, outbufSize);
}

void
RubberBandStretcher::Impl::ChannelData::construct(const std::set<size_t> &sizes,
                                                  size_t initialWindowSize,
                                                  size_t initialFftSize,
                                                  size_t outbufSize)
{
    size_t maxSize = initialWindowSize * 2;
    if (initialFftSize > maxSize) maxSize = initialFftSize;

//    std::cerr << "ChannelData::construct: initialWindowSize = " << initialWindowSize << ", initialFftSize = " << initialFftSize << ", outbufSize = " << outbufSize << std::endl;

    // std::set is ordered by value
    std::set<size_t>::const_iterator i = sizes.end();
    if (i != sizes.begin()) {
        --i;
        if (*i > maxSize) maxSize = *i;
    }

    // max possible size of the real "half" of freq data
    size_t realSize = maxSize / 2 + 1;

//    std::cerr << "ChannelData::construct([" << sizes.size() << "], " << maxSize << ", " << realSize << ", " << outbufSize << ")" << std::endl;
    
    if (outbufSize < maxSize) outbufSize = maxSize;

    inbuf = new RingBuffer<float>(maxSize);
    outbuf = new RingBuffer<float>(outbufSize);

    mag = allocate_and_zero<process_t>(realSize);
    phase = allocate_and_zero<process_t>(realSize);
    prevPhase = allocate_and_zero<process_t>(realSize);
    prevError = allocate_and_zero<process_t>(realSize);
    unwrappedPhase = allocate_and_zero<process_t>(realSize);
    envelope = allocate_and_zero<process_t>(realSize);

    fltbuf = allocate_and_zero<float>(maxSize);
    dblbuf = allocate_and_zero<process_t>(maxSize);

    accumulator = allocate_and_zero<float>(maxSize);
    windowAccumulator = allocate_and_zero<float>(maxSize);
    interpolator = allocate_and_zero<float>(maxSize);
    interpolatorScale = 0;

    for (std::set<size_t>::const_iterator i = sizes.begin();
         i != sizes.end(); ++i) {
        ffts[*i] = new FFT(*i);
        if (sizeof(process_t) == sizeof(double)) {
            ffts[*i]->initDouble();
        } else {
            ffts[*i]->initFloat();
        }
    }
    fft = ffts[initialFftSize];

    resampler = 0;
    resamplebuf = 0;
    resamplebufSize = 0;

    reset();

    // Avoid dividing opening sample (which will be discarded anyway) by zero
    windowAccumulator[0] = 1.f;
}


void
RubberBandStretcher::Impl::ChannelData::setSizes(size_t windowSize,
                                                 size_t fftSize)
{
//    std::cerr << "ChannelData::setSizes: windowSize = " << windowSize << ", fftSize = " << fftSize << std::endl;

    size_t maxSize = 2 * std::max(windowSize, fftSize);
    size_t realSize = maxSize / 2 + 1;
    size_t oldMax = inbuf->getSize();
    size_t oldReal = oldMax / 2 + 1;

    if (oldMax >= maxSize) {

        // no need to reallocate buffers, just reselect fft

        //!!! we can't actually do this without locking against the
        //process thread, can we?  we need to zero the mag/phase
        //buffers without interference

        if (ffts.find(fftSize) == ffts.end()) {
            //!!! this also requires a lock, but it shouldn't occur in
            //RT mode with proper initialisation
            ffts[fftSize] = new FFT(fftSize);
            if (sizeof(process_t) == sizeof(double)) {
                ffts[fftSize]->initDouble();
            } else {
                ffts[fftSize]->initFloat();
            }
        }
        
        fft = ffts[fftSize];

        v_zero(fltbuf, maxSize);
        v_zero(dblbuf, maxSize);

        v_zero(mag, realSize);
        v_zero(phase, realSize);
        v_zero(prevPhase, realSize);
        v_zero(prevError, realSize);
        v_zero(unwrappedPhase, realSize);

        return;
    }

    //!!! at this point we need a lock in case a different client
    //thread is calling process() -- we need this lock even if we
    //aren't running in threaded mode ourselves -- if we're in RT
    //mode, then the process call should trylock and fail if the lock
    //is unavailable (since this should never normally be the case in
    //general use in RT mode)

    RingBuffer<float> *newbuf = inbuf->resized(maxSize);
    delete inbuf;
    inbuf = newbuf;

    // We don't want to preserve data in these arrays

    mag = reallocate_and_zero(mag, oldReal, realSize);
    phase = reallocate_and_zero(phase, oldReal, realSize);
    prevPhase = reallocate_and_zero(prevPhase, oldReal, realSize);
    prevError = reallocate_and_zero(prevError, oldReal, realSize);
    unwrappedPhase = reallocate_and_zero(unwrappedPhase, oldReal, realSize);
    envelope = reallocate_and_zero(envelope, oldReal, realSize);
    fltbuf = reallocate_and_zero(fltbuf, oldMax, maxSize);
    dblbuf = reallocate_and_zero(dblbuf, oldMax, maxSize);

    interpolator = reallocate_and_zero<float>(interpolator, oldMax, maxSize);

    // But we do want to preserve data in these

    accumulator = reallocate_and_zero_extension
        (accumulator, oldMax, maxSize);

    windowAccumulator = reallocate_and_zero_extension
        (windowAccumulator, oldMax, maxSize);

    interpolatorScale = 0;
    
    //!!! and resampler?

    if (ffts.find(fftSize) == ffts.end()) {
        ffts[fftSize] = new FFT(fftSize);
        if (sizeof(process_t) == sizeof(double)) {
            ffts[fftSize]->initDouble();
        } else {
            ffts[fftSize]->initFloat();
        }
    }
    
    fft = ffts[fftSize];
}

void
RubberBandStretcher::Impl::ChannelData::setOutbufSize(size_t outbufSize)
{
    size_t oldSize = outbuf->getSize();

//    std::cerr << "ChannelData::setOutbufSize(" << outbufSize << ") [from " << oldSize << "]" << std::endl;

    if (oldSize < outbufSize) {

        //!!! at this point we need a lock in case a different client
        //thread is calling process()

        RingBuffer<float> *newbuf = outbuf->resized(outbufSize);
        delete outbuf;
        outbuf = newbuf;
    }
}

void
RubberBandStretcher::Impl::ChannelData::setResampleBufSize(size_t sz)
{
    resamplebuf = reallocate_and_zero<float>(resamplebuf, resamplebufSize, sz);
    resamplebufSize = sz;
}

RubberBandStretcher::Impl::ChannelData::~ChannelData()
{
    delete resampler;

    deallocate(resamplebuf);

    delete inbuf;
    delete outbuf;

    deallocate(mag);
    deallocate(phase);
    deallocate(prevPhase);
    deallocate(prevError);
    deallocate(unwrappedPhase);
    deallocate(envelope);
    deallocate(accumulator);
    deallocate(windowAccumulator);
    deallocate(fltbuf);

    for (std::map<size_t, FFT *>::iterator i = ffts.begin();
         i != ffts.end(); ++i) {
        delete i->second;
    }
}

void
RubberBandStretcher::Impl::ChannelData::reset()
{
    inbuf->reset();
    outbuf->reset();

    if (resampler) resampler->reset();

    size_t size = inbuf->getSize();

    for (size_t i = 0; i < size; ++i) {
        accumulator[i] = 0.f;
        windowAccumulator[i] = 0.f;
    }

    // Avoid dividing opening sample (which will be discarded anyway) by zero
    windowAccumulator[0] = 1.f;
    
    accumulatorFill = 0;
    prevIncrement = 0;
    chunkCount = 0;
    inCount = 0;
    inputSize = -1;
    outCount = 0;
    interpolatorScale = 0;
    unchanged = true;
    draining = false;
    outputComplete = false;
}

}