prepare to add a reference player

src/engine/filePlayer.h

@@ -0,0 +1,69 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2025 tildearrow and contributors
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _FILEPLAYER_H
+#define _FILEPLAYER_H
+
+#include <mutex>
+
+#ifdef HAVE_SNDFILE
+#include "sfWrapper.h"
+#else
+typedef void SNDFILE;
+struct SF_INFO {
+  int invalid;
+};
+#endif
+
+class DivFilePlayer {
+  float** blocks;
+  String lastError;
+  SNDFILE* sf;
+  SF_INFO si;
+
+  size_t playPos;
+  int outRate;
+  int rateAccum;
+  float volume;
+  bool playing;
+  bool fileError;
+
+  std::mutex cacheMutex;
+
+  void fillBlocksNear(size_t pos);
+
+  public:
+    void mix(float** buf, int chans, unsigned int size);
+    size_t getPos();
+    size_t setPos(size_t newPos, unsigned int offset=0);
+    
+    bool isPlaying();
+    void play(unsigned int offset=0);
+    void stop(unsigned int offset=0);
+    bool closeFile();
+    bool loadFile(const char* path);
+
+    String getLastError();
+    void setOutputRate(int rate);
+    float getVolume();
+    void setVolume(float vol);
+
+    DivFilePlayer();
+    ~DivFilePlayer();
+};