44795 2010-08-27 14:31:35 -0700 audio engine: add Biquad files 2010-09-09 17:41:43 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Other OS X 10.5 RESOLVED FIXED P2 Normal --- 0 crogers webkit-unassigned cmarrin commit-queue eric.carlson jer.noble kbr simon.fraser oldest_to_newest 270756 0 crogers 2010-08-27 14:31:35 -0700 audio engine: add Biquad files 270757 1 65768 crogers 2010-08-27 14:32:46 -0700 Created attachment 65768 Patch 275542 2 65768 kbr 2010-09-07 19:18:53 -0700 Comment on attachment 65768 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=65768&action=prettypatch I trust that the math is correct and is in some generally standard form for signal processing which is why the equations are in certain forms with certain variable names. I have one main question, which we've discussed offline, about a double negative which might imply changing where some negation occurs throughout the code. Also a couple of minor formatting issues. Will wait for your feedback before updating the review status of the patch. > WebCore/platform/audio/Biquad.cpp:69 > + Unnecessary newline > WebCore/platform/audio/Biquad.cpp:165 > + destP[1] = destP[framesToProcess - 1 + 2]; These are subtle since they would look like out of bounds accesses on arrays simply of length framesToProcess. Could you add a comment referencing the allocation of two extra samples for the input and output buffers in the constructor? > WebCore/platform/audio/Biquad.cpp:190 > + resonance = 0.0; // for now can't go negative resonance = std::max(0.0, resonance); > WebCore/platform/audio/Biquad.cpp:212 > + resonance = 0.0; // for now can't go negative Same std::max as above. > WebCore/platform/audio/Biquad.cpp:266 > + m_b1 = - (-2.0 * pole.real()); Why do you have a double negative here? Why not just write "2.0 * pole.real()"? > WebCore/platform/audio/Biquad.cpp:269 > + m_b2 = - (poleMag * poleMag); Extra space between - and ( > WebCore/platform/audio/Biquad.h:90 > + Unnecessary newline? 276184 3 66967 crogers 2010-09-08 16:59:17 -0700 Created attachment 66967 Patch 276188 4 crogers 2010-09-08 17:03:25 -0700 Ken, I've addressed your comments. I've also fixed an issue where the filter coefficients (m_b1 and m_b2) were being used with negative values from what is normally used in biquad filter difference equations. I've negated their use both in the processing math and when the coefficient values are calculated, so overall there is no change mathematically, but the code now looks cleaner and is in a more standard form. 276754 5 66967 kbr 2010-09-09 14:15:57 -0700 Comment on attachment 66967 Patch Looks good. 276877 6 66967 commit-queue 2010-09-09 17:41:37 -0700 Comment on attachment 66967 Patch Clearing flags on attachment: 66967 Committed r67132: <http://trac.webkit.org/changeset/67132> 276880 7 commit-queue 2010-09-09 17:41:43 -0700 All reviewed patches have been landed. Closing bug. 65768 2010-08-27 14:32:46 -0700 2010-09-08 16:59:12 -0700 Patch bug-44795-20100827143244.patch text/plain 13219 crogers SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiA2NjI1NykKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMjggQEAKKzIwMTAtMDgtMjcgIENocmlzIFJvZ2VycyAgPGNyb2dlcnNAZ29vZ2xl LmNvbT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBh dWRpbyBlbmdpbmU6IGFkZCBCaXF1YWQgZmlsZXMKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtp dC5vcmcvc2hvd19idWcuY2dpP2lkPTQ0Nzk1CisKKyAgICAgICAgTm8gbmV3IHRlc3RzIHNpbmNl IGF1ZGlvIEFQSSBpcyBub3QgeWV0IGltcGxlbWVudGVkLgorCisgICAgICAgICogcGxhdGZvcm0v YXVkaW86IEFkZGVkLgorICAgICAgICAqIHBsYXRmb3JtL2F1ZGlvL0JpcXVhZC5jcHA6IEFkZGVk LgorICAgICAgICAoV2ViQ29yZTo6QmlxdWFkOjpCaXF1YWQpOgorICAgICAgICAoV2ViQ29yZTo6 QmlxdWFkOjpwcm9jZXNzKToKKyAgICAgICAgKFdlYkNvcmU6OkJpcXVhZDo6cHJvY2Vzc0Zhc3Qp 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