hongchan@chromium.org mjwilson@chromium.org The length (in frames) requested by createBuffer(). Recorded for every call to createBuffer(). Probably many (tens or hundreds) per page. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The number of channels requested by createBuffer(). Recorded for every call to createBuffer(). Probably many (tens or hundreds) per page. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The sample rate (in Hz) requested by createBuffer(). Recorded for every call to createBuffer(). Probably many (tens or hundreds) per page. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The ratio of the buffer sample rate from createBuffer() to the context sample rate. This indicates if the buffer needs to be resampled. Recorded for every call to createBuffer(). Probably many (tens or hundreds) per page. hongchan@chromium.org mjwilson@chromium.org cduvall@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Measures the time it takes to create the AudioContext object. This is recorded every time an AudioContext is successfully created. hongchan@chromium.org mjwilson@chromium.org The hardware sample rate (in Hz) used by an AudioContext. Recorded for every WebAudio AudioContext that is created; probably only one or two per page. hongchan@chromium.org mjwilson@chromium.org If provided, the latencyHint option category of "interactive", "balanced", "playback", or "exact", in that order where "exact" means an explicit floating point value was provided. Recorded for every AudioContext that is constructed with a latencyHint. hongchan@chromium.org mjwilson@chromium.org If the latencyHint is provided and is a floating-point number, the value in milliseconds is recorded. This is recorded for every AudioContext that is constructed with a floating-point latencyHint value. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The maximum number of (hardware) channels available in an AudioContext. Recorded for every WebAudio AudioContext that is created; probably only one or two per page. fdoray@chromium.org hongchan@chromium.org Tracks occurences of AudioContext operations, to allow assessing what proportion of AudioContexts are explicitly closed. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The sample rate requested by developer to be used as the sample rate when constructing an AudioContext with an AudioContextOptions dictionary. This is recorded for each AudioContext created, probably just one or two per page. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The ratio of the user-selected sample rate to the hardware sample rate of an AudioContext. The ratio is represented as a percentage. This is recorded for each AudioContext created, probably just one or two per page. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The callback buffer size (in audio frames) for WebAudio rendering between the WebAudio graph and the audio device thread. This can differ from the value recommended by the audio hardware due to internal constraints in WebAudio. Recorded for every WebAudio AudioContext that is created. hongchan@chromium.org mjwilson@chromium.org The buffer size (in audio frames) for WebAudio rendering recommended by the audio hardware. Recorded for every WebAudio AudioContext that is created. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The latency reported from the audio hardware. This number can be dynamic at runtime but the metric is collected only once at the first platform audio callback after an AudioContext is created. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The autoplay status of an AudioContext when destroyed. This include all types of frames. In order to know the value only for main frames, the .CrossOrigin values can be substracted. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The autoplay status of an AudioContext when destroyed in a cross-origin frame. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Records how an AudioContext was unlocked (if it was). This is recorded when the AudioContext is destroyed. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The type of the BiquadFilterNode. Recorded each time the type is set. This recorded once (to lowpass) when a biquad filter is created and also recorded whenever the filter type changes due to user action or programatically. It is unlikely the type will change more than once. hongchan@chromium.org mjwilson@chromium.org The duration in millisec of impulse responses for a ConvolverNode. Recorded each time the impulse response is set for a ConvolverNode. hongchan@chromium.org mjwilson@chromium.org The order of the WebAudio IIRFilterNode. The order is one less than the number of feedback coefficients used in the denominator of the IIRFilter transfer function. Recorded each time an IIRFilter is constructed. hongchan@chromium.org mjwilson@chromium.org cduvall@chromium.org Measures the time it takes to create the OfflineAudioContext object. This is recorded every time an OfflineAudioContext is successfully created. hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The panning model for the PannerNode. Recorded once with the default value at creation and once again whenver it is changed. Once changed, it is unlikely to be changed again. If there are any PannerNodes created at all, then there is probably one for each source (AudioBufferSourceNode, OscillatorNode, or other source). hongchan@chromium.org mjwilson@chromium.org Captures if WebAudio caused glitches or not due to the FIFO underflow. It is recorded when PushPullFIFO is destroyed. (e.g. navigating away from the page.) hongchan@chromium.org mjwilson@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Percentage of FIFO underflow happened due to the the missed deadline of WebAudio rendering engine. It is recorded when PushPullFIFO is destroyed. (e.g. navigating away from the page.)