mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The length (in frames) requested by createBuffer(). Recorded for every call to createBuffer(). Probably many (tens or hundreds) per page. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Records the total audible time of an AudioContext in seconds. The histogram has 8 buckets, representing durations of 0s, 1s, ..., up to 7s. Values of 8s or more are counted in the overflow bucket. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Records the maximum number of concurrently active AudioContexts that existed at one time within a render frame's lifetime (capped at 100 for reporting). This is recorded when the frame is destroyed. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Records when an AudioContext is destroyed (i.e., garbage collected) without the DidClose() method being explicitly called on it first. This is recorded with a value of `true` in the AudioContext destructor if the context is not already in a closed state. Or A value of `false` is recorded if the AudioContext was already in a 'closed' state when it was destroyed. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS 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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS 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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS 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. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@chromium.org gabrielbrito@microsoft.com src/third_party/blink/renderer/modules/webaudio/OWNERS Tracks the reason for the AudioContext being interrupted when the frame is being controlled by the MediaPlaybackWhileNotVisible permission policy and the frame is not visible. mjwilson@chromium.org hongchan@chromium.org fdoray@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Tracks occurences of AudioContext operations, to allow assessing what proportion of AudioContexts are explicitly closed. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The buffer size (in audio frames) for WebAudio rendering recommended by the audio hardware. Recorded for every WebAudio AudioContext that is created. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Records the status of the selected audio output device at the time a sink is created. This helps understand the reliability and availability of output devices. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The audio delay in milliseconds based on the number of available frames of the PushPUllFIFO in AudioDestination. The metric is averaged and reported at every 1000 render callbacks. This metric is categorized by "ModeTag", which indicates the rendering mode: DualThread, used when audio worklet is involved. Or SingleThread, used when audio worklet is not involved. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The number of times the PushPullFIFO in AudioDestination experienced an underrun. The "Intervals" duration indicates that the metric is measured and logged every 1000 audio render callbacks. For "Short", it is logged at the end of the audio stream. This metric is categorized by "ModeTag", which indicates the rendering mode: DualThread, used when audio worklet is involved. Or SingleThread, used when audio worklet is not involved. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The percentage of time spent in AudioDestination::Render relative to the expected callback interval. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The percentage of time elapsed between a request to AudioDestination::RequestRender and its actual start, relative to the expected callback interval. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The percentage of time spent in AudioDestination::RequestRender relative to the expected callback interval. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The audio delay in milliseconds that covers the whole pipeline from the WebAudio graph to the speaker. This metric is categorized by "ModeTag", which indicates the rendering mode: DualThread, used when audio worklet is involved. Or SingleThread, used when audio worklet is not involved. The metric is averaged and reported at every 1000 render callbacks. hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The number of times the AudioDestination experienced an unexpected underrun in bypass mode. The "Intervals" duration indicates that the metric is measured and logged every 1000 audio render callbacks. For "Short", it is logged at the end of the audio stream. This metric is categorized by "ModeTag", which indicates the rendering mode: DualThread, used when audio worklet is involved. Or SingleThread, used when audio worklet is not involved. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Reports the ratio of an AudioHandler's Process() method execution time to its allocated time budget for a given render quantum. This is reported as a percentage, averaged over 1000 Process() calls. For example, if Process() consistently takes half the allocated time, 50 will be reported. The maximum recorded percentage is capped at 100. The "NodeTag" suffix indicates the specific type of AudioNode (e.g., GainNode, DelayNode). mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The maximum number of dedicated backing worklet threads throughout the lifetime of the document/frame. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The maximum number of ref counts using the shared backing thread throughout the lifetime of the document/frame. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The autoplay status of an AudioContext when destroyed in a cross-origin frame. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@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. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS The duration in millisec of impulse responses for a ConvolverNode. Recorded each time the impulse response is set for a ConvolverNode. mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS 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. mjwilson@chromium.org hongchan@chromium.org cduvall@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS Measures the time it takes to create the OfflineAudioContext object. This is recorded every time an OfflineAudioContext is successfully created. mjwilson@chromium.org hongchan@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). mjwilson@chromium.org hongchan@chromium.org src/third_party/blink/renderer/modules/webaudio/OWNERS 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.) mjwilson@chromium.org hongchan@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.)