diff options
Diffstat (limited to 'testing/web-platform/tests/webaudio/resources/mix-testing.js')
-rw-r--r-- | testing/web-platform/tests/webaudio/resources/mix-testing.js | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/resources/mix-testing.js b/testing/web-platform/tests/webaudio/resources/mix-testing.js new file mode 100644 index 0000000000..63c8e1aca6 --- /dev/null +++ b/testing/web-platform/tests/webaudio/resources/mix-testing.js @@ -0,0 +1,23 @@ +let toneLengthSeconds = 1; + +// Create a buffer with multiple channels. +// The signal frequency in each channel is the multiple of that in the first +// channel. +function createToneBuffer(context, frequency, duration, numberOfChannels) { + let sampleRate = context.sampleRate; + let sampleFrameLength = duration * sampleRate; + + let audioBuffer = + context.createBuffer(numberOfChannels, sampleFrameLength, sampleRate); + + let n = audioBuffer.length; + + for (let k = 0; k < numberOfChannels; ++k) { + let data = audioBuffer.getChannelData(k); + + for (let i = 0; i < n; ++i) + data[i] = Math.sin(frequency * (k + 1) * 2.0 * Math.PI * i / sampleRate); + } + + return audioBuffer; +} |