summaryrefslogtreecommitdiffstats
path: root/dom/media/webaudio/test/webaudio.js
blob: 1a1a8efb74be1058fe42c59fb6994aa2878b1bee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
// Helpers for Web Audio tests

function expectException(func, exceptionCode) {
  var threw = false;
  try {
    func();
  } catch (ex) {
    threw = true;
    ok(ex instanceof DOMException, "Expect a DOM exception");
    is(ex.code, exceptionCode, "Expect the correct exception code");
  }
  ok(threw, "The exception was thrown");
}

function expectNoException(func) {
  var threw = false;
  try {
    func();
  } catch (ex) {
    threw = true;
  }
  ok(!threw, "An exception was not thrown");
}

function expectTypeError(func) {
  var threw = false;
  try {
    func();
  } catch (ex) {
    threw = true;
    ok(ex instanceof TypeError, "Expect a TypeError");
  }
  ok(threw, "The exception was thrown");
}

function expectRejectedPromise(that, func, exceptionName) {
  var promise = that[func]();

  ok(promise instanceof Promise, "Expect a Promise");

  promise.then(function(res) {
    ok(false, "Promise resolved when it should have been rejected.");
  }).catch(function(err) {
    is(err.name, exceptionName, "Promise correctly reject with " + exceptionName);
  });
}

function fuzzyCompare(a, b) {
  return Math.abs(a - b) < 9e-3;
}

function compareChannels(buf1, buf2,
                        /*optional*/ length,
                        /*optional*/ sourceOffset,
                        /*optional*/ destOffset,
                        /*optional*/ skipLengthCheck) {
  if (!skipLengthCheck) {
    is(buf1.length, buf2.length, "Channels must have the same length");
  }
  sourceOffset = sourceOffset || 0;
  destOffset = destOffset || 0;
  if (length == undefined) {
    length = buf1.length - sourceOffset;
  }
  var difference = 0;
  var maxDifference = 0;
  var firstBadIndex = -1;
  for (var i = 0; i < length; ++i) {
    if (!fuzzyCompare(buf1[i + sourceOffset], buf2[i + destOffset])) {
      difference++;
      maxDifference = Math.max(maxDifference, Math.abs(buf1[i + sourceOffset] - buf2[i + destOffset]));
      if (firstBadIndex == -1) {
        firstBadIndex = i;
      }
    }
  };

  is(difference, 0, "maxDifference: " + maxDifference +
     ", first bad index: " + firstBadIndex +
     " with test-data offset " + sourceOffset + " and expected-data offset " +
     destOffset + "; corresponding values " + buf1[firstBadIndex + sourceOffset] +
     " and " + buf2[firstBadIndex + destOffset] + " --- differences");
}

function compareBuffers(got, expected) {
  if (got.numberOfChannels != expected.numberOfChannels) {
    is(got.numberOfChannels, expected.numberOfChannels,
       "Correct number of buffer channels");
    return;
  }
  if (got.length != expected.length) {
    is(got.length, expected.length,
       "Correct buffer length");
    return;
  }
  if (got.sampleRate != expected.sampleRate) {
    is(got.sampleRate, expected.sampleRate,
       "Correct sample rate");
    return;
  }

  for (var i = 0; i < got.numberOfChannels; ++i) {
    compareChannels(got.getChannelData(i), expected.getChannelData(i),
                    got.length, 0, 0, true);
  }
}

/**
 * Compute the root mean square (RMS,
 * <http://en.wikipedia.org/wiki/Root_mean_square>) of a channel of a slice
 * (defined by `start` and `end`) of an AudioBuffer.
 *
 * This is useful to detect that a buffer is noisy or silent.
 */
function rms(audiobuffer, channel = 0, start = 0, end = audiobuffer.length) {
  var buffer= audiobuffer.getChannelData(channel);
  var rms = 0;
  for (var i = start; i < end; i++) {
    rms += buffer[i] * buffer[i];
  }

  rms /= buffer.length;
  rms = Math.sqrt(rms);
  return rms;
}

function getEmptyBuffer(context, length) {
  return context.createBuffer(gTest.numberOfChannels, length, context.sampleRate);
}

/**
 * This function assumes that the test file defines a single gTest variable with
 * the following properties and methods:
 *
 * + numberOfChannels: optional property which specifies the number of channels
 *                     in the output.  The default value is 2.
 * + createGraph: mandatory method which takes a context object and does
 *                everything needed in order to set up the Web Audio graph.
 *                This function returns the node to be inspected.
 * + createGraphAsync: async version of createGraph.  This function takes
 *                     a callback which should be called with an argument
 *                     set to the node to be inspected when the callee is
 *                     ready to proceed with the test.  Either this function
 *                     or createGraph must be provided.
 * + createExpectedBuffers: optional method which takes a context object and
 *                          returns either one expected buffer or an array of
 *                          them, designating what is expected to be observed
 *                          in the output.  If omitted, the output is expected
 *                          to be silence.  All buffers must have the same
 *                          length, which must be a bufferSize supported by
 *                          ScriptProcessorNode.  This function is guaranteed
 *                          to be called before createGraph.
 * + length: property equal to the total number of frames which we are waiting
 *           to see in the output, mandatory if createExpectedBuffers is not
 *           provided, in which case it must be a bufferSize supported by
 *           ScriptProcessorNode (256, 512, 1024, 2048, 4096, 8192, or 16384).
 *           If createExpectedBuffers is provided then this must be equal to
 *           the number of expected buffers * the expected buffer length.
 *
 * + skipOfflineContextTests: optional. when true, skips running tests on an offline
 *                            context by circumventing testOnOfflineContext.
 */
function runTest()
{
  function done() {
    SimpleTest.finish();
  }

  SimpleTest.waitForExplicitFinish();
  function runTestFunction () {
    if (!gTest.numberOfChannels) {
      gTest.numberOfChannels = 2; // default
    }

    var testLength;

    function runTestOnContext(context, callback, testOutput) {
      if (!gTest.createExpectedBuffers) {
        // Assume that the output is silence
        var expectedBuffers = getEmptyBuffer(context, gTest.length);
      } else {
        var expectedBuffers = gTest.createExpectedBuffers(context);
      }
      if (!(expectedBuffers instanceof Array)) {
        expectedBuffers = [expectedBuffers];
      }
      var expectedFrames = 0;
      for (var i = 0; i < expectedBuffers.length; ++i) {
        is(expectedBuffers[i].numberOfChannels, gTest.numberOfChannels,
           "Correct number of channels for expected buffer " + i);
        expectedFrames += expectedBuffers[i].length;
      }
      if (gTest.length && gTest.createExpectedBuffers) {
        is(expectedFrames, gTest.length, "Correct number of expected frames");
      }

      if (gTest.createGraphAsync) {
        gTest.createGraphAsync(context, function(nodeToInspect) {
          testOutput(nodeToInspect, expectedBuffers, callback);
        });
      } else {
        testOutput(gTest.createGraph(context), expectedBuffers, callback);
      }
    }

    function testOnNormalContext(callback) {
      function testOutput(nodeToInspect, expectedBuffers, callback) {
        testLength = 0;
        var sp = context.createScriptProcessor(expectedBuffers[0].length, gTest.numberOfChannels, 0);
        nodeToInspect.connect(sp);
        sp.onaudioprocess = function(e) {
          var expectedBuffer = expectedBuffers.shift();
          testLength += expectedBuffer.length;
          compareBuffers(e.inputBuffer, expectedBuffer);
          if (expectedBuffers.length == 0) {
            sp.onaudioprocess = null;
            callback();
          }
        };
      }
      var context = new AudioContext();
      runTestOnContext(context, callback, testOutput);
    }

    function testOnOfflineContext(callback, sampleRate) {
      function testOutput(nodeToInspect, expectedBuffers, callback) {
        nodeToInspect.connect(context.destination);
        context.oncomplete = function(e) {
          var samplesSeen = 0;
          while (expectedBuffers.length) {
            var expectedBuffer = expectedBuffers.shift();
            is(e.renderedBuffer.numberOfChannels, expectedBuffer.numberOfChannels,
               "Correct number of input buffer channels");
            for (var i = 0; i < e.renderedBuffer.numberOfChannels; ++i) {
              compareChannels(e.renderedBuffer.getChannelData(i),
                             expectedBuffer.getChannelData(i),
                             expectedBuffer.length,
                             samplesSeen,
                             undefined,
                             true);
            }
            samplesSeen += expectedBuffer.length;
          }
          callback();
        };
        context.startRendering();
      }

      var context = new OfflineAudioContext(gTest.numberOfChannels, testLength, sampleRate);
      runTestOnContext(context, callback, testOutput);
    }

    testOnNormalContext(function() {
      if (!gTest.skipOfflineContextTests) {
        testOnOfflineContext(function() {
          testOnOfflineContext(done, 44100);
        }, 48000);
      } else {
        done();
      }
    });
  };

  if (document.readyState !== 'complete') {
    addLoadEvent(runTestFunction);
  } else {
    runTestFunction();
  }
}