Mapping Audio WG Use Cases and Requirements

Revision 4 – 22nd March 2012

Requirement Family Requirement Requirement Priority UC 1: Video Chat UC 2: HTML5 game with audio effects, music UC 3: online music production tool UC 4: Online radio broadcast UC 5: writing music on the web UC 6: wavetable synthesis of a virtual music instrument UC 7: Audio / Music Visualization UC 8: UI/DOM Sounds UC-9 : Language learning UC-10 : Podcast on a flight UC-11: DJ music at 125 BPM UC-12 : Soundtrack and sound effects in a video editing tool UC-13 : Web-based guitar practice service UC-14 : User Control of Audio UC-15 : Video commentary
Use Case Priority High High Low Low Low High High Low Low Low Low Low Low Low Low
Sources of audio Support for primary audio file formats Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
One source, many sounds Minority, but important ✓ ✓ ✓ ✓ ✓ ✓
Playing / Looping sources of audio Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Capture of audio from microphone, line in, other inputs Minority, but important ✓ ✓ ✓ ✓
Adding effects to the audio part of a video stream, and keep it in sync with the video playback Minority, but important ✓ ✓ ✓
Sample-accurate scheduling of playback Minority, but important ✓ ✓ ✓ ✓ ✓
Buffering Minority, but important ✓ ✓ ✓ ✓ ✓
Support for basic polyphony Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Rapid scheduling of many independent sources Minority, but important ✓ ✓ ✓ ✓ ✓
Triggering of audio sources Minority, but important ✓ ✓ ✓ ✓ ✓ ✓
Audio quality Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Transformations of sources of audio Modularity of transformations Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓
Transformation parameter automation Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Gain adjustment Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Simple playback rate adjustment Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Spatialization Minority, but important ✓ ✓ ✓ ✓
Filtering Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Noise gating Minority, but important ✓ ✓ ✓
Dynamic range compression Minority, but important ✓ ✓ ✓ ✓ ✓ ✓
The simulation of acoustic spaces Minority, but important ✓ ✓ ✓
The simulation of occlusions and obstructions Minority, but important ✓
Source Combination and Interaction Mixing Sources Baseline ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Ducking Minority, but important ✓ ✓ ✓ ✓ ✓ ✓
Echo cancellation Minority, but important ✓ ✓
Analysis of sources Level detection Minority, but important ✓ ✓ ✓ ✓ ✓
Frequency domain analysis Minority, but important ✓ ✓
Synthesis of sources Generation of common signals for synthesis and parameter modulation purposes Minority, but important ✓ ✓
The ability to read in standard definitions of wavetable instruments Minority, but important ✓ ✓
Acceptable performance of synthesis Minority, but important ✓ ✓

Revisions and Changes