Developer Builds First Browser-Based BRSTM Audio Converter Using WebAssembly

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A developer has created BGM Box, the first browser-based tool for converting Nintendo BRSTM game audio files, eliminating the need for desktop apps or command-line tools. The project compiles three C libraries — vgmstream, DspTool, and audio export encoders — into WebAssembly modules using Emscripten. Processing is offloaded to background Web Workers so the UI remains responsive during intensive encoding tasks. A key technical hurdle was a PCM channel deinterleaving bug that caused garbled audio output, traced through hex dump comparisons of raw audio buffers. The tool supports over 100 game audio formats and enables conversions on Mac, Linux, and Windows directly in the browser.

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