17400 2012-06-05 12:20:04 +0000 (AudioGainScale): GainNode scale underdefined 2014-10-28 17:16:36 +0000 1 1 1 Unclassified AudioWG Web Audio API unspecified PC All CLOSED WONTFIX P2 normal TBD 1 mike crogers olivier.thereaux ot philipj public-audio dave.null oldest_to_newest 68712 0 mike 2012-06-05 12:20:04 +0000 Audio-ISSUE-45 (AudioGainScale): AudioGain scale underdefined [Web Audio API] http://www.w3.org/2011/audio/track/issues/45 Raised by: Philip Jägenstedt On product: Web Audio API The spec says "The default amount is 1 (no gain change)" and 'The unit type is "linear gain"' but doesn't define what linear gain means. Particularly, does a gain of 2 mean that the float32 sample values are multiplied by 2, or is the scale something else? 68782 1 olivier.thereaux 2012-06-07 08:17:22 +0000 [admin] Assigning items currently being worked on by editor. 68812 2 olivier.thereaux 2012-06-07 14:55:40 +0000 From the editor: More detailed text added: https://dvcs.w3.org/hg/audio/rev/4de4b8263c21 68984 3 philipj 2012-06-12 14:18:58 +0000 The question was answered (output = input * gain) but no normative requirements on implementations were added. We suggest avoiding phrasing like "will" or "is". A "must" is missing in somewhere in the following: "Every PCM audio sample in the input is multiplied by the gain parameter's value for the specific time corresponding to that audio sample. This multiplied value represents the PCM audio sample for the output. The number of channels of the output will always equal the number of channels of the input, with each channel of the input being multiplied by the gain values and being copied into the corresponding channel of the output." They could also be replaced by something like "output[t] = gain[t] * input[t]" given some basic definitions to support it, but that is editorial. Editorial issues: "By default, it will take the input and pass it through to the output unchanged, which represents a constant gain change of 1." can be removed since it's already defined in the attributes section. "As with other <code>AudioParams</code>, the <code>gain</code> parameter represents a mapping from time (in the coordinate system of AudioContext.currentTime) to floating-point value." can be moved to the AudioParam section since it is generally true, or removed. 80343 4 olivier.thereaux 2012-12-18 13:18:18 +0000 Renaming issue to match renaming of AudioGain/GainNode interface. 113863 5 olivier.thereaux 2014-10-28 17:13:43 +0000 Web Audio API issues have been migrated to Github. See https://github.com/WebAudio/web-audio-api/issues 114004 6 olivier.thereaux 2014-10-28 17:16:36 +0000 Closing. See https://github.com/WebAudio/web-audio-api/issues for up to date list of issues for the Web Audio API.