third_party/WebKit/ManualTests/webaudio/multichannel-mediastreamdestination.html - Issue 1464673002: Support multichannel audio stream more than 2 in MediaStreamDestinationNode

Unified Diff: third_party/WebKit/ManualTests/webaudio/multichannel-mediastreamdestination.html

Issue 1464673002: Support multichannel audio stream more than 2 in MediaStreamDestinationNode (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Fixed intdentation Created 5 years, 1 month ago

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Index: third_party/WebKit/ManualTests/webaudio/multichannel-mediastreamdestination.html

diff --git a/third_party/WebKit/ManualTests/webaudio/multichannel.html b/third_party/WebKit/ManualTests/webaudio/multichannel-mediastreamdestination.html

similarity index 75%

copy from third_party/WebKit/ManualTests/webaudio/multichannel.html

copy to third_party/WebKit/ManualTests/webaudio/multichannel-mediastreamdestination.html

index d5958520c2f0f8d65fea74e05c0e5347a6122a53..218697d4144333d9f4808815563e8461a1636750 100644

--- a/third_party/WebKit/ManualTests/webaudio/multichannel.html

+++ b/third_party/WebKit/ManualTests/webaudio/multichannel-mediastreamdestination.html

@@ -1,7 +1,7 @@

<!doctype html>

<html>

<head>

- <title>Test multichannel support.</title>

+ <title>Test multichannel support for MediaStreamDestination.</title>

body {

margin: 2em;

@@ -15,26 +15,29 @@

padding: 1em;

font-size: 1em;

}

+ #eError {

+ font-family: Arial;

+ margin: 0.75em;

+ color: red;

+ }

</style>

</head>

<body>

- <h1>Test Multichannel Audio Output</h1>

+ <h1>Test Multichannel Audio Output for MediaStreamDestination</h1>

+ <p><strong>NOTE: This test requires HTTP server.</strong></p>

- <p>Tests that multichannel audio output (> 8 channels) is working correctly.

- This test cannot be run with an offline audio context because it requires

- an actual audio hardware with the multichannel capability.</p>

+ <p>This test is for multichannel (> 2 channels) support for

+ MediaStreamDestination. This test cannot be run with an offline audio

+ context because the node is not compatible with the offline context.</p>

<p>Press "Start Test Tone" to run the test. You should hear an one-second

sine tone from all the available audio output channels from the channel 1

to the last channel.</p>

- <p>Note that this test only works on OSX because CoreAudio driver supports

- the multichannel streams (more than 2) on a single audio device whereas

- other platforms do not.</p>

- <p>CRBUG issue: <a href="https://code.google.com/p/chromium/issues/detail?id=424795" target="_blank">

- 424795</a></p>

+ <p>CRBUG issue: <a href="https://code.google.com/p/chromium/issues/detail?id=557185" target="_blank">

+ 557185</a></p>

<p>Max Channel Count: <span id="eMaxChannelCount">2</span></p>

@@ -42,13 +45,15 @@

<button id="eButton" onclick="startTestTones()">Start Test Tone</button>

</div>

+ <div id="eError"></div>

// Silent interval between the test tones.

var testToneInterval = 0.1;

// The safe range for the equal loudness of sinusoid is roughly between

// 200 ~ 1000Hz, which is A3(57) ~ C6(84). In this test, the starting

- // pitch is 220Hz and the interval is the whole tone. (2 MIDI pitch)

+ // pitch is 220Hz and the interval is the whole tone. (2 MIDI pitch)

// With 16 speakers, the last test tone will play the MIDI pitch of

// F6(89), which is 1396Hz.

var startMIDIPitch = 57;

@@ -56,20 +61,28 @@

var eMaxChannelCount = document.querySelector('#eMaxChannelCount');

var eButton = document.querySelector('#eButton');

var eChannelIndex = document.querySelector('#eChannelIndex');

+ var eError = document.querySelector('#eError');

var context = new AudioContext();

+ var mediaStreamDestination = context.createMediaStreamDestination();

var maxChannelCount = context.destination.maxChannelCount;

- // Sets the destination properties for multichannel access.

- context.destination.channelCount = maxChannelCount;

- context.destination.channelCountMode = 'explicit';

- context.destination.channelInterpretation = 'discrete';

+ try {

+ mediaStreamDestination.channelCount = maxChannelCount;

+ } catch (error) {

+ eError.textContent = error;

+ }

+ var audioElement = new Audio();

+ audioElement.src = URL.createObjectURL(mediaStreamDestination.stream);

+ audioElement.play();

// The ChannelMerger for the individual channel access.

var merger = context.createChannelMerger(maxChannelCount);

merger.channelCountMode = 'explicit';

merger.channelInterpretation = 'discrete';

- merger.connect(context.destination);

+ merger.connect(mediaStreamDestination);

eMaxChannelCount.textContent = maxChannelCount;

@@ -78,6 +91,9 @@

return 440 * Math.pow(2, (midiPitch - 69) / 12);

}

+ // A global storage to keep the OSC reference alive.

+ var oscs = [];

// Play a test tone for the specified amount of duration at the channel.

function playTestToneAtChannel(channelIndex, gain, duration) {

var osc = context.createOscillator();

@@ -99,7 +115,7 @@

// The channel index starts from 1.

eChannelIndex.textContent = 'Channel #' + (channelIndex + 1);

var now = context.currentTime;

var toneDuration = duration - testToneInterval;

@@ -111,6 +127,10 @@

osc.start(now);

osc.stop(now + duration);

+ // Push osc to keep the reference alive. Otherwise |osc| will be

+ // collected and the |onended| event won't be fired.

+ oscs.push(osc);

}

// When the button is clicked the button to produce the test sound,

@@ -120,7 +140,7 @@

function startTestTones() {

eButton.disabled = true;

- // Math.SQRT1_2(=0.707..) is -3dB. This is necessary because 1.0

+ // Math.SQRT1_2(=0.707..) is -3dB. This is necessary because 1.0

// amplitude can cause overload/distortion on some speakers.

playTestToneAtChannel(0, Math.SQRT1_2, 1.0);

}