83558 2012-04-10 02:24:27 -0700 Add Doppler effect support for MediaElementAudioSourceNode 2012-04-19 00:21:00 -0700 1 1 1 Unclassified WebKit Web Audio 528+ (Nightly build) Unspecified Unspecified UNCONFIRMED P2 Normal --- 0 xingnan.wang webkit-unassigned crogers eric.carlson feature-media-reviews webkit.review.bot oldest_to_newest 599106 0 xingnan.wang 2012-04-10 02:24:27 -0700 AudioBufferSourceNode will incorporate the doppler shift to pitch rate, MediaElementAudioSourceNode should also support doppler effect on the audio source. 599114 1 136415 xingnan.wang 2012-04-10 02:39:11 -0700 Created attachment 136415 Patch 599331 2 eric.carlson 2012-04-10 09:20:26 -0700 Is this requirement in the spec? 599395 3 crogers 2012-04-10 10:38:05 -0700 (In reply to comment #2) > Is this requirement in the spec? It isn't in the spec, and I wasn't anticipating this as even a possibility. I would suggest we avoid this because it could significantly complicate integration with HTMLMediaElement. I also don't think it's likely to be needed very often. 604624 4 xingnan.wang 2012-04-18 00:58:28 -0700 (In reply to comment #3) > (In reply to comment #2) > > Is this requirement in the spec? > > It isn't in the spec, and I wasn't anticipating this as even a possibility. I would suggest we avoid this because it could significantly complicate integration with HTMLMediaElement. I also don't think it's likely to be needed very often. Hi Chris, I`m a little confused that AudioBufferSourceNode supports the doppler effect but HTMLMediaElement not. They are both audio sources, why different? Does that mean HTMLMediaElementNode + Panner(with doppler) is rare case and it`s meaningless to support it? Also it seems that they are not specified in spec. And how about new-added Oscillator? It should be another kind of source node, right? 604868 5 crogers 2012-04-18 10:35:18 -0700 (In reply to comment #4) > (In reply to comment #3) > > (In reply to comment #2) > > > Is this requirement in the spec? > > > > It isn't in the spec, and I wasn't anticipating this as even a possibility. I would suggest we avoid this because it could significantly complicate integration with HTMLMediaElement. I also don't think it's likely to be needed very often. > > Hi Chris, > > I`m a little confused that AudioBufferSourceNode supports the doppler effect but HTMLMediaElement not. > They are both audio sources, why different? Yes, this is a good point. But it is difficult to implement the pitch shift using this technique as in this patch. > Does that mean HTMLMediaElementNode + Panner(with doppler) is rare case and it`s meaningless to support it? I think it will be a much rarer case than AudioBufferSourceNode. I wouldn't say it's meaningless in an ideal world, but it is just extremely fragile to try to pitch shift with resampler changes in this way because of the way the HTMLMediaElements are implemented in browsers. > Also it seems that they are not specified in spec. True, I should be clear about it. > And how about new-added Oscillator? It should be another kind of source node, right? I think the Oscillator can support the pitch shift very similar to AudioBufferSourceNode. I'll try to be clear in the spec... 605424 6 xingnan.wang 2012-04-19 00:21:00 -0700 (In reply to comment #5) > (In reply to comment #4) > > (In reply to comment #3) > > > (In reply to comment #2) > > > > Is this requirement in the spec? > > > > > > It isn't in the spec, and I wasn't anticipating this as even a possibility. I would suggest we avoid this because it could significantly complicate integration with HTMLMediaElement. I also don't think it's likely to be needed very often. > > > > Hi Chris, > > > > I`m a little confused that AudioBufferSourceNode supports the doppler effect but HTMLMediaElement not. > > They are both audio sources, why different? > > Yes, this is a good point. But it is difficult to implement the pitch shift using this technique as in this patch. > > > > Does that mean HTMLMediaElementNode + Panner(with doppler) is rare case and it`s meaningless to support it? > > I think it will be a much rarer case than AudioBufferSourceNode. I wouldn't say it's meaningless in an ideal world, but it is just extremely fragile to try to pitch shift with resampler changes in this way because of the way the HTMLMediaElements are implemented in browsers. Do you mean the real limitation is we use resampler to change the pitch? It will be much better to use other pitch-shift methods without time change, right? > > > Also it seems that they are not specified in spec. > > True, I should be clear about it. > > > And how about new-added Oscillator? It should be another kind of source node, right? > > I think the Oscillator can support the pitch shift very similar to AudioBufferSourceNode. I'll try to be clear in the spec... I also have another question. We implement resampling internally in AudioBufferSourceNode, and do doppler pitch shifting together now. But why not to implement doppler pitch shift separately in pannerNode? One possible reason I guess is it may reduce once resamping, but if so how about the case that we have many AudioBufferSourceNode? 136415 2012-04-10 02:39:11 -0700 2012-04-10 10:38:34 -0700 Patch bug-83558-20120410174250.patch text/plain 6829 xingnan.wang U3VidmVyc2lvbiBSZXZpc2lvbjogMTEzNjYzCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZDIxMThjZmIwM2ExNDdi NDlmYmMxMmY1NzM0ZDA5NDBjYjU5OWM4Yy4uZTYyYTNiZTllZTZiZDljZWY4YzAwMTUzZmM3MTM0 MmUzNzE1MWEzNyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIyIEBACisyMDEyLTA0LTEwICBYaW5n bmFuIFdhbmcgIDx4aW5nbmFuLndhbmdAaW50ZWwuY29tPgorCisgICAgICAgIEFkZCBEb3BwbGVy IGVmZmVjdCBzdXBwb3J0IGZvciBNZWRpYUVsZW1lbnRBdWRpb1NvdXJjZU5vZGUKKyAgICAgICAg aHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTgzNTU4CisKKyAgICAgICAg UmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgKiBNb2R1bGVzL3dlYmF1ZGlv 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