--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/chiptune2.js	Sun May 30 15:53:14 2021 -0400
@@ -0,0 +1,259 @@
+// constants
+const OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT = 2
+const OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH = 1
+
+// audio context
+var ChiptuneAudioContext = window['AudioContext'] || window['webkitAudioContext'];
+
+// config
+var ChiptuneJsConfig = function (repeatCount, stereoSeparation, interpolationFilter, context)
+{
+  this.repeatCount = repeatCount;
+  this.stereoSeparation = stereoSeparation;
+  this.interpolationFilter = interpolationFilter;
+  this.context = context;
+}
+
+ChiptuneJsConfig.prototype.constructor = ChiptuneJsConfig;
+
+// player
+var ChiptuneJsPlayer = function (config) {
+  this.config = config;
+  this.context = config.context || new ChiptuneAudioContext();
+  this.currentPlayingNode = null;
+  this.handlers = [];
+  this.touchLocked = true;
+}
+
+ChiptuneJsPlayer.prototype.constructor = ChiptuneJsPlayer;
+
+// event handlers section
+ChiptuneJsPlayer.prototype.fireEvent = function (eventName, response) {
+  var  handlers = this.handlers;
+  if (handlers.length) {
+    handlers.forEach(function (handler) {
+      if (handler.eventName === eventName) {
+        handler.handler(response);
+      }
+    })
+  }
+}
+
+ChiptuneJsPlayer.prototype.addHandler = function (eventName, handler) {
+  this.handlers.push({eventName: eventName, handler: handler});
+}
+
+ChiptuneJsPlayer.prototype.onEnded = function (handler) {
+  this.addHandler('onEnded', handler);
+}
+
+ChiptuneJsPlayer.prototype.onError = function (handler) {
+  this.addHandler('onError', handler);
+}
+
+// metadata
+ChiptuneJsPlayer.prototype.duration = function() {
+  return libopenmpt._openmpt_module_get_duration_seconds(this.currentPlayingNode.modulePtr);
+}
+
+ChiptuneJsPlayer.prototype.getCurrentRow = function() {
+  return libopenmpt._openmpt_module_get_current_row(this.currentPlayingNode.modulePtr);  
+}
+
+ChiptuneJsPlayer.prototype.getCurrentPattern = function() {
+  return libopenmpt._openmpt_module_get_current_pattern(this.currentPlayingNode.modulePtr);  
+}
+
+ChiptuneJsPlayer.prototype.getCurrentOrder = function() {
+  return libopenmpt._openmpt_module_get_current_order(this.currentPlayingNode.modulePtr);  
+}
+
+ChiptuneJsPlayer.prototype.metadata = function() {
+  var data = {};
+  var keys = Pointer_stringify(libopenmpt._openmpt_module_get_metadata_keys(this.currentPlayingNode.modulePtr)).split(';');
+  var keyNameBuffer = 0;
+  for (var i = 0; i < keys.length; i++) {
+    keyNameBuffer = libopenmpt._malloc(keys[i].length + 1);
+    writeAsciiToMemory(keys[i], keyNameBuffer);
+    data[keys[i]] = Pointer_stringify(libopenmpt._openmpt_module_get_metadata(this.currentPlayingNode.modulePtr, keyNameBuffer));
+    libopenmpt._free(keyNameBuffer);
+  }
+  return data;
+}
+
+ChiptuneJsPlayer.prototype.module_ctl_set = function(ctl, value) {
+  return libopenmpt.ccall('openmpt_module_ctl_set', 'number', ['number', 'string', 'string'], [this.currentPlayingNode.modulePtr, ctl, value]) === 1;
+}
+
+// playing, etc
+ChiptuneJsPlayer.prototype.unlock = function() {
+
+  var context = this.context;
+  var buffer = context.createBuffer(1, 1, 22050);
+  var unlockSource = context.createBufferSource();
+
+  unlockSource.buffer = buffer;
+  unlockSource.connect(context.destination);
+  unlockSource.start(0);
+
+  this.touchLocked = false;
+}
+
+ChiptuneJsPlayer.prototype.load = function(input, callback) {
+
+  if (this.touchLocked) {
+    this.unlock();
+  }
+
+  var player = this;
+
+  if (input instanceof File) {
+    var reader = new FileReader();
+    reader.onload = function() {
+      return callback(reader.result); // no error
+    }.bind(this);
+    reader.readAsArrayBuffer(input);
+  } else {
+    var xhr = new XMLHttpRequest();
+    xhr.open('GET', input, true);
+    xhr.responseType = 'arraybuffer';
+    xhr.onload = function(e) {
+      if (xhr.status === 200) {
+        return callback(xhr.response); // no error
+      } else {
+        player.fireEvent('onError', {type: 'onxhr'});
+      }
+    }.bind(this);
+    xhr.onerror = function() {
+      player.fireEvent('onError', {type: 'onxhr'});
+    };
+    xhr.onabort = function() {
+      player.fireEvent('onError', {type: 'onxhr'});
+    };
+    xhr.send();
+  }
+}
+
+ChiptuneJsPlayer.prototype.play = function(buffer) {
+  this.stop();
+  var processNode = this.createLibopenmptNode(buffer, this.config);
+  if (processNode == null) {
+    return;
+  }
+
+  // set config options on module
+  libopenmpt._openmpt_module_set_repeat_count(processNode.modulePtr, this.config.repeatCount);
+  libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_STEREOSEPARATION_PERCENT, this.config.stereoSeparation);
+  libopenmpt._openmpt_module_set_render_param(processNode.modulePtr, OPENMPT_MODULE_RENDER_INTERPOLATIONFILTER_LENGTH, this.config.interpolationFilter);
+
+  this.currentPlayingNode = processNode;
+  processNode.connect(this.context.destination);
+}
+
+ChiptuneJsPlayer.prototype.stop = function() {
+  if (this.currentPlayingNode != null) {
+    this.currentPlayingNode.disconnect();
+    this.currentPlayingNode.cleanup();
+    this.currentPlayingNode = null;
+  }
+}
+
+ChiptuneJsPlayer.prototype.togglePause = function() {
+	if (this.currentPlayingNode != null) {
+    this.currentPlayingNode.togglePause();
+  }
+}
+
+ChiptuneJsPlayer.prototype.createLibopenmptNode = function(buffer, config) {
+  // TODO error checking in this whole function
+
+  var maxFramesPerChunk = 4096;
+  var processNode = this.context.createScriptProcessor(2048, 0, 2);
+  processNode.config = config;
+  processNode.player = this;
+  var byteArray = new Int8Array(buffer);
+  var ptrToFile = libopenmpt._malloc(byteArray.byteLength);
+  libopenmpt.HEAPU8.set(byteArray, ptrToFile);
+  processNode.modulePtr = libopenmpt._openmpt_module_create_from_memory(ptrToFile, byteArray.byteLength, 0, 0, 0);
+  processNode.paused = false;
+  processNode.leftBufferPtr  = libopenmpt._malloc(4 * maxFramesPerChunk);
+  processNode.rightBufferPtr = libopenmpt._malloc(4 * maxFramesPerChunk);
+  processNode.cleanup = function() {
+    if (this.modulePtr != 0) {
+      libopenmpt._openmpt_module_destroy(this.modulePtr);
+      this.modulePtr = 0;
+    }
+    if (this.leftBufferPtr != 0) {
+      libopenmpt._free(this.leftBufferPtr);
+      this.leftBufferPtr = 0;
+    }
+    if (this.rightBufferPtr != 0) {
+      libopenmpt._free(this.rightBufferPtr);
+      this.rightBufferPtr = 0;
+    }
+  }
+  processNode.stop = function() {
+    this.disconnect();
+    this.cleanup();
+  }
+  processNode.pause = function() {
+    this.paused = true;
+  }
+  processNode.unpause = function() {
+    this.paused = false;
+  }
+  processNode.togglePause = function() {
+    this.paused = !this.paused;
+  }
+  processNode.onaudioprocess = function(e) {
+    var outputL = e.outputBuffer.getChannelData(0);
+    var outputR = e.outputBuffer.getChannelData(1);
+    var framesToRender = outputL.length;
+    if (this.ModulePtr == 0) {
+      for (var i = 0; i < framesToRender; ++i) {
+        outputL[i] = 0;
+        outputR[i] = 0;
+      }
+      this.disconnect();
+      this.cleanup();
+      return;
+    }
+    if (this.paused) {
+      for (var i = 0; i < framesToRender; ++i) {
+        outputL[i] = 0;
+        outputR[i] = 0;
+      }
+      return;
+    }
+    var framesRendered = 0;
+    var ended = false;
+    var error = false;
+    while (framesToRender > 0) {
+      var framesPerChunk = Math.min(framesToRender, maxFramesPerChunk);
+      var actualFramesPerChunk = libopenmpt._openmpt_module_read_float_stereo(this.modulePtr, this.context.sampleRate, framesPerChunk, this.leftBufferPtr, this.rightBufferPtr);
+      if (actualFramesPerChunk == 0) {
+        ended = true;
+        // modulePtr will be 0 on openmpt: error: openmpt_module_read_float_stereo: ERROR: module * not valid or other openmpt error
+        error = !this.modulePtr;
+      }
+      var rawAudioLeft = libopenmpt.HEAPF32.subarray(this.leftBufferPtr / 4, this.leftBufferPtr / 4 + actualFramesPerChunk);
+      var rawAudioRight = libopenmpt.HEAPF32.subarray(this.rightBufferPtr / 4, this.rightBufferPtr / 4 + actualFramesPerChunk);
+      for (var i = 0; i < actualFramesPerChunk; ++i) {
+        outputL[framesRendered + i] = rawAudioLeft[i];
+        outputR[framesRendered + i] = rawAudioRight[i];
+      }
+      for (var i = actualFramesPerChunk; i < framesPerChunk; ++i) {
+        outputL[framesRendered + i] = 0;
+        outputR[framesRendered + i] = 0;
+      }
+      framesToRender -= framesPerChunk;
+      framesRendered += framesPerChunk;
+    }
+    if (ended) {
+      this.disconnect();
+      this.cleanup();
+      error ? processNode.player.fireEvent('onError', {type: 'openmpt'}) : processNode.player.fireEvent('onEnded');
+    }
+  }
+  return processNode;
+}