diff audioio/ClipMixer.h @ 305:9716c75499ef tonioni

Toward using a sample mixer (with arbitrary frequency target) instead of dssi player plugin

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/audioio/ClipMixer.h	Tue Jan 07 10:58:10 2014 +0000
@@ -0,0 +1,69 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam, 2006-2014 QMUL.
+    
+    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.
+*/
+
+#ifndef _CLIP_MIXER_H_
+#define _CLIP_MIXER_H_
+
+#include <QString>
+#include <vector>
+
+/**
+ * Mix in synthetic notes produced by resampling a prerecorded
+ * clip. That is, this is a sampler.
+ */
+
+class ClipMixer
+{
+public:
+    ClipMixer(int channels, int sampleRate, int blockSize);
+    ~ClipMixer();
+
+    bool loadClipData(QString clipFilePath, float clipF0);
+
+    //!!! what can we find in common with the NoteData type and
+    //!!! AudioGenerator's NoteOff?
+
+    struct NoteStart {
+	int id; // unique to match note end
+	int frameOffset; // in current processing block
+	float frequency; // Hz
+	float level; // volume in range (0,1]
+	float pan; // range [-1,1]
+    };
+
+    struct NoteEnd {
+	int id; // matching note start
+	int frameOffset; // in current processing block
+    };
+
+    void mix(float **toBuffers, 
+	     std::vector<NoteStart> newNotes, 
+	     std::vector<NoteEnd> endingNotes);
+
+private:
+    int m_channels;
+    int m_sampleRate;
+    int m_blockSize;
+
+    QString m_clipPath;
+
+    float *m_clipData;
+    int m_clipLength;
+    float m_clipF0;
+    float m_clipRate;
+};
+
+
+#endif