spa-resample

spa-resample [OPTIONS] INFILE OUTFILE

spa-resample is a command-line utility that uses the PipeWire SPA resampler to convert audio files from one sample rate and format to another. It reads a WAV input file, applies resampling with the specified parameters, and writes the result to a WAV output file.The tool is primarily intended for testing and debugging the PipeWire resampler implementation rather than as a general-purpose audio conversion tool. It provides direct access to the same resampling algorithm that PipeWire uses internally for audio stream processing, making it useful for verifying resampler behavior and quality.

-r RATE, --rate=RATE

Output sample rate.

Output sample format (s8 | s16 | s32 | f32 | f64).

Resampler output quality (0-14). Higher values produce better quality at the cost of more CPU usage.

CPU feature flags for SIMD optimization selection. See spa/support/cpu.h for details.

Verbose operation.

Show help.

This tool is designed for testing and debugging purposes only, not for production audio conversion workflows. For general-purpose audio format conversion, dedicated tools like sox or ffmpeg are more appropriate. Only WAV files are supported as input and output formats. The quality parameter range of 0-14 is specific to the PipeWire SPA resampler and does not correspond to quality scales used by other resamplers.

spa-resample is part of the PipeWire multimedia framework, which was created by Wim Taymans and first released in 2017. PipeWire was designed as a unified audio and video server to replace both PulseAudio and JACK on Linux systems. The spa-resample utility provides standalone access to PipeWire's built-in SPA (Simple Plugin API) resampler, which supports multiple SIMD-optimized backends for efficient sample rate conversion.

pipewire(1), pw-cli(1), pw-cat(1), sox(1), ffmpeg(1)