Chris@305: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@305: 
Chris@305: /*
Chris@305:     Sonic Visualiser
Chris@305:     An audio file viewer and annotation editor.
Chris@305:     Centre for Digital Music, Queen Mary, University of London.
Chris@305:     This file copyright 2006 Chris Cannam, 2006-2014 QMUL.
Chris@305:     
Chris@305:     This program is free software; you can redistribute it and/or
Chris@305:     modify it under the terms of the GNU General Public License as
Chris@305:     published by the Free Software Foundation; either version 2 of the
Chris@305:     License, or (at your option) any later version.  See the file
Chris@305:     COPYING included with this distribution for more information.
Chris@305: */
Chris@305: 
Chris@305: #include "ClipMixer.h"
Chris@305: 
Chris@305: #include <sndfile.h>
Chris@310: #include <cmath>
Chris@305: 
Chris@305: #include "base/Debug.h"
Chris@305: 
Chris@305: ClipMixer::ClipMixer(int channels, int sampleRate, int blockSize) :
Chris@305:     m_channels(channels),
Chris@305:     m_sampleRate(sampleRate),
Chris@305:     m_blockSize(blockSize),
Chris@305:     m_clipData(0)
Chris@305: {
Chris@305: }
Chris@305: 
Chris@305: ClipMixer::~ClipMixer()
Chris@305: {
Chris@317:     if (m_clipData) free(m_clipData);
Chris@305: }
Chris@305: 
Chris@308: void
Chris@308: ClipMixer::setChannelCount(int channels)
Chris@308: {
Chris@308:     m_channels = channels;
Chris@308: }
Chris@308: 
Chris@305: bool
Chris@305: ClipMixer::loadClipData(QString path, float f0)
Chris@305: {
Chris@305:     if (m_clipData) {
Chris@307:         cerr << "ClipMixer::loadClipData: Already have clip loaded" << endl;
Chris@305:         return false;
Chris@305:     }
Chris@305: 
Chris@305:     SF_INFO info;
Chris@305:     SNDFILE *file;
Chris@305:     int sampleCount = 0;
Chris@305:     float *tmpFrames;
Chris@305:     size_t i;
Chris@305: 
Chris@305:     info.format = 0;
Chris@305:     file = sf_open(path.toLocal8Bit().data(), SFM_READ, &info);
Chris@305:     if (!file) {
Chris@308: 	cerr << "ClipMixer::loadClipData: Failed to open file path \""
Chris@308:              << path << "\": " << sf_strerror(file) << endl;
Chris@305: 	return false;
Chris@305:     }
Chris@305: 
Chris@305:     tmpFrames = (float *)malloc(info.frames * info.channels * sizeof(float));
Chris@305:     if (!tmpFrames) {
Chris@307:         cerr << "ClipMixer::loadClipData: malloc(" << info.frames * info.channels * sizeof(float) << ") failed" << endl;
Chris@305:         return false;
Chris@305:     }
Chris@305: 
Chris@305:     sf_readf_float(file, tmpFrames, info.frames);
Chris@305:     sf_close(file);
Chris@305: 
Chris@305:     m_clipData = (float *)malloc(info.frames * sizeof(float));
Chris@305:     if (!m_clipData) {
Chris@307:         cerr << "ClipMixer::loadClipData: malloc(" << info.frames * sizeof(float) << ") failed" << endl;
Chris@305: 	free(tmpFrames);
Chris@305: 	return false;
Chris@305:     }
Chris@305: 
Chris@305:     for (i = 0; i < info.frames; ++i) {
Chris@305: 	int j;
Chris@305: 	m_clipData[i] = 0.0f;
Chris@305: 	for (j = 0; j < info.channels; ++j) {
Chris@305: 	    m_clipData[i] += tmpFrames[i * info.channels + j];
Chris@305: 	}
Chris@305:     }
Chris@305: 
Chris@305:     free(tmpFrames);
Chris@305: 
Chris@305:     m_clipLength = info.frames;
Chris@305:     m_clipF0 = f0;
Chris@305:     m_clipRate = info.samplerate;
Chris@310: 
Chris@310:     return true;
Chris@305: }
Chris@307: 
Chris@307: void
Chris@308: ClipMixer::reset()
Chris@308: {
Chris@310:     m_playing.clear();
Chris@310: }
Chris@310: 
Chris@310: float
Chris@310: ClipMixer::getResampleRatioFor(float frequency)
Chris@310: {
Chris@310:     if (!m_clipData) return 1.0;
Chris@311:     float pitchRatio = m_clipF0 / frequency;
Chris@310:     float resampleRatio = m_sampleRate / m_clipRate;
Chris@310:     return pitchRatio * resampleRatio;
Chris@310: }
Chris@310: 
Chris@310: int
Chris@310: ClipMixer::getResampledClipDuration(float frequency)
Chris@310: {
Chris@310:     return int(ceil(m_clipLength * getResampleRatioFor(frequency)));
Chris@308: }
Chris@308: 
Chris@308: void
Chris@307: ClipMixer::mix(float **toBuffers, 
Chris@308:                float gain,
Chris@307:                std::vector<NoteStart> newNotes, 
Chris@307:                std::vector<NoteEnd> endingNotes)
Chris@307: {
Chris@310:     foreach (NoteStart note, newNotes) {
matthiasm@321:         if (note.frequency > 20 && 
matthiasm@321:             note.frequency < 2000) {
matthiasm@321:             m_playing.push_back(note);
matthiasm@321:         }
Chris@310:     }
Chris@310: 
Chris@310:     std::vector<NoteStart> remaining;
Chris@310: 
Chris@310:     float *levels = new float[m_channels];
Chris@310: 
Chris@310:     foreach (NoteStart note, m_playing) {
Chris@310: 
Chris@310:         for (int c = 0; c < m_channels; ++c) {
Chris@310:             levels[c] = gain;
Chris@310:         }
Chris@310:         if (note.pan != 0.0 && m_channels == 2) {
Chris@310:             levels[0] *= 1.0 - note.pan;
Chris@310:             levels[1] *= note.pan + 1.0;
Chris@310:         }
Chris@310: 
Chris@310:         int start = note.frameOffset;
Chris@310:         int durationHere = m_blockSize;
Chris@310:         if (start > 0) durationHere = m_blockSize - start;
Chris@310: 
Chris@310:         bool ending = false;
Chris@310: 
Chris@310:         foreach (NoteEnd end, endingNotes) {
Chris@310:             if (end.frequency == note.frequency && 
Chris@310:                 end.frameOffset >= start &&
Chris@310:                 end.frameOffset <= m_blockSize) {
Chris@310:                 ending = true;
Chris@310:                 durationHere = end.frameOffset;
Chris@310:                 if (start > 0) durationHere = end.frameOffset - start;
Chris@310:                 break;
Chris@310:             }
Chris@310:         }
Chris@310: 
Chris@310:         int clipDuration = getResampledClipDuration(note.frequency);
Chris@310:         if (start + clipDuration > 0) {
Chris@310:             if (start < 0 && start + clipDuration < durationHere) {
Chris@311:                 durationHere = start + clipDuration;
Chris@310:             }
Chris@310:             if (durationHere > 0) {
Chris@310:                 mixNote(toBuffers,
Chris@310:                         levels,
Chris@310:                         note.frequency,
Chris@310:                         start < 0 ? -start : 0,
Chris@310:                         start > 0 ?  start : 0,
matthiasm@320:                         durationHere,
matthiasm@320:                         ending);
Chris@310:             }
Chris@310:         }
Chris@310: 
Chris@310:         if (!ending) {
Chris@310:             NoteStart adjusted = note;
Chris@310:             adjusted.frameOffset -= m_blockSize;
Chris@310:             remaining.push_back(adjusted);
Chris@310:         }
Chris@310:     }
Chris@310: 
Chris@313:     delete[] levels;
Chris@313: 
Chris@310:     m_playing = remaining;
Chris@307: }
Chris@307: 
Chris@310: void
Chris@310: ClipMixer::mixNote(float **toBuffers,
Chris@310:                    float *levels,
Chris@310:                    float frequency,
Chris@310:                    int sourceOffset,
Chris@310:                    int targetOffset,
matthiasm@320:                    int sampleCount,
matthiasm@320:                    bool isEnd)
Chris@310: {
Chris@310:     if (!m_clipData) return;
Chris@310: 
Chris@310:     float ratio = getResampleRatioFor(frequency);
Chris@310:     
matthiasm@320:     float releaseTime = 0.01;
matthiasm@320:     int releaseSampleCount = round(releaseTime * m_sampleRate);
matthiasm@320:     if (releaseSampleCount > sampleCount) {
matthiasm@320:         releaseSampleCount = sampleCount;
matthiasm@320:     }
matthiasm@320:     float releaseFraction = 1.f/releaseSampleCount;
Chris@310: 
Chris@310:     for (int i = 0; i < sampleCount; ++i) {
Chris@310: 
Chris@310:         int s = sourceOffset + i;
Chris@310: 
Chris@310:         float os = s / ratio;
Chris@310:         int osi = int(floor(os));
Chris@310: 
Chris@310:         //!!! just linear interpolation for now (same as SV's sample
Chris@310:         //!!! player). a small sinc kernel would be better and
Chris@310:         //!!! probably "good enough"
Chris@310:         float value = 0.f;
Chris@310:         if (osi < m_clipLength) {
Chris@310:             value += m_clipData[osi];
Chris@310:         }
Chris@310:         if (osi + 1 < m_clipLength) {
Chris@310:             value += (m_clipData[osi + 1] - m_clipData[osi]) * (os - osi);
Chris@310:         }
matthiasm@320:          
matthiasm@320:         if (isEnd && i + releaseSampleCount > sampleCount) {
matthiasm@320:             value *= releaseFraction * (sampleCount - i); // linear ramp for release
matthiasm@320:         }
matthiasm@320: 
Chris@310:         for (int c = 0; c < m_channels; ++c) {
Chris@311:             toBuffers[c][targetOffset + i] += levels[c] * value;
Chris@310:         }
Chris@310:     }
Chris@310: }
Chris@310: 
Chris@310: