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@312: #ifndef CLIP_MIXER_H
Chris@312: #define CLIP_MIXER_H
Chris@305: 
Chris@305: #include <QString>
Chris@305: #include <vector>
Chris@305: 
Chris@305: /**
Chris@305:  * Mix in synthetic notes produced by resampling a prerecorded
Chris@312:  * clip. (i.e. this is an implementation of a digital sampler in the
Chris@312:  * musician's sense.) This can mix any number of notes of arbitrary
Chris@312:  * frequency, so long as they all use the same sample clip.
Chris@305:  */
Chris@305: 
Chris@305: class ClipMixer
Chris@305: {
Chris@305: public:
Chris@305:     ClipMixer(int channels, int sampleRate, int blockSize);
Chris@305:     ~ClipMixer();
Chris@305: 
Chris@308:     void setChannelCount(int channels);
Chris@312: 
Chris@312:     /**
Chris@312:      * Load a sample clip from a wav file. This can only happen once:
Chris@349:      * construct a new ClipMixer if you want a different clip. The
Chris@349:      * clip was recorded at a pitch with fundamental frequency clipF0,
Chris@349:      * and should be scaled by level (in the range 0-1) when playing
Chris@349:      * back.
Chris@312:      */
Chris@349:     bool loadClipData(QString clipFilePath, float clipF0, float level);
Chris@305: 
Chris@308:     void reset(); // discarding any playing notes
Chris@308: 
Chris@305:     struct NoteStart {
Chris@310: 	int frameOffset; // within current processing block
Chris@305: 	float frequency; // Hz
Chris@305: 	float level; // volume in range (0,1]
Chris@305: 	float pan; // range [-1,1]
Chris@305:     };
Chris@305: 
Chris@305:     struct NoteEnd {
Chris@310: 	int frameOffset; // in current processing block
Chris@308:         float frequency; // matching note start
Chris@305:     };
Chris@305: 
Chris@305:     void mix(float **toBuffers, 
Chris@308:              float gain,
Chris@305: 	     std::vector<NoteStart> newNotes, 
Chris@305: 	     std::vector<NoteEnd> endingNotes);
Chris@305: 
Chris@305: private:
Chris@305:     int m_channels;
Chris@305:     int m_sampleRate;
Chris@305:     int m_blockSize;
Chris@305: 
Chris@305:     QString m_clipPath;
Chris@305: 
Chris@305:     float *m_clipData;
Chris@305:     int m_clipLength;
Chris@305:     float m_clipF0;
Chris@305:     float m_clipRate;
Chris@310: 
Chris@310:     std::vector<NoteStart> m_playing;
Chris@310: 
Chris@310:     float getResampleRatioFor(float frequency);
Chris@310:     int getResampledClipDuration(float frequency);
Chris@310: 
Chris@310:     void mixNote(float **toBuffers, 
Chris@310:                  float *levels,
Chris@310:                  float frequency,
Chris@310:                  int sourceOffset, // within resampled note
Chris@310:                  int targetOffset, // within target buffer
matthiasm@320:                  int sampleCount,
matthiasm@320:                  bool isEnd);
Chris@305: };
Chris@305: 
Chris@305: 
Chris@305: #endif