Closed Bug 1118622 Opened 11 years ago Closed 10 years ago

[Web Audio API] data from analyser getByteTimeDomainData is always full-scaled

Categories

(Core :: Web Audio, defect)

37 Branch
x86_64
Windows 8.1
defect
Not set
normal

Tracking

()

RESOLVED FIXED
mozilla39
Tracking Status
firefox39 --- fixed

People

(Reporter: gaito, Assigned: padenot)

References

Details

Attachments

(1 file)

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36 Steps to reproduce: data retrieved with analyser getByteTimeDomainData() always has full-scaled amplitude (0-255). test code is here : --- <script> var data=new Uint8Array(256); var actx=new AudioContext(); var osc=actx.createOscillator(); var gain=actx.createGain(); var analyser=actx.createAnalyser(); osc.connect(gain); gain.connect(analyser); analyser.connect(actx.destination); osc.start(0); setInterval(function(){ analyser.getByteTimeDomainData(data); var ctx=document.getElementById("canvas").getContext("2d"); ctx.clearRect(0,0,256,256); for(var i=0;i<256;++i) ctx.fillRect(i,255,1,-data[i]); },500); </script> <button onclick="gain.gain.value=0">vol=0</button> <button onclick="gain.gain.value=0.1">vol=0.1</button> <button onclick="gain.gain.value=1">vol=1</button><br/> <canvas id="canvas" width="256" height="256"></canvas> --- 1) access to http://www.g200kg.com/demo/test/test-analysertimedomain.html 2) press 'vol' buttons and check the waveform amplitude Actual results: waveform amplitude is always full-scaled even switch volume, and it is not updated if vol=0 Expected results: waveform amplitude should be changed according to current vol setting.
Assignee: nobody → padenot
Status: UNCONFIRMED → ASSIGNED
Ever confirmed: true
Comment on attachment 8556533 [details] [diff] [review] Apply the gain to AnalyserNode data prior to sending on the main thread. r= I chose to do most of the work on the audio thread, the main thread is busy enough!
Attachment #8556533 - Flags: review?(ehsan)
Attachment #8556533 - Flags: review?(ehsan) → review+
Status: ASSIGNED → RESOLVED
Closed: 10 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla39
Depends on: 1184801
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