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lass.pds.lassul.us/superconfig
This repository has no description
tools.record: init
author
lassulus
date
(Jan 11, 2026, 10:48 PM CET)
commit
159bc3a7
159bc3a79d445121da3f6aad171e423cf1fc83dd
parent
8c3f933b
8c3f933b20c500d04f2cad454e1fef40e63ca217
+171
+57
5pkgs/system-audio-dump/package.nix
+57
5pkgs/system-audio-dump/package.nix
···
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{
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lib,
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fetchFromGitHub,
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swift,
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swiftpm,
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swiftPackages,
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}:
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swiftPackages.stdenv.mkDerivation {
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pname = "system-audio-dump";
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version = "0-unstable-2025-09-02";
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src = fetchFromGitHub {
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owner = "sohzm";
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repo = "systemAudioDump";
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rev = "19caa4f6c0661c03a10d1f08c79a11f0b00f251a";
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hash = "sha256-H2TeB7/Meq7EvfW7zLZn5GGFrKwCyZuJvafv61ZWdrA=";
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};
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nativeBuildInputs = [
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swift
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swiftpm
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];
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postPatch = ''
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# Downgrade swift-tools-version from 6.0 to 5.10 and macOS from v15 to v14
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sed -i 's/swift-tools-version:6.0/swift-tools-version:5.10/' Package.swift
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sed -i 's/.macOS(.v15)/.macOS(.v14)/' Package.swift
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# Patch Swift 6 / macOS 15 features in source
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# Remove @retroactive attribute (Swift 6 feature for silencing conformance warnings)
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sed -i 's/@retroactive //' Sources/SystemAudioDump/main.swift
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# Remove captureMicrophone (macOS 15+ only, defaults to false anyway)
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sed -i '/captureMicrophone/d' Sources/SystemAudioDump/main.swift
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'';
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buildPhase = ''
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runHook preBuild
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swift build -c release
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runHook postBuild
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'';
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installPhase = ''
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runHook preInstall
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mkdir -p $out/bin
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cp .build/release/SystemAudioDump $out/bin/system-audio-dump
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runHook postInstall
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'';
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meta = {
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description = "macOS CLI that captures system audio and outputs raw PCM to stdout";
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homepage = "https://github.com/sohzm/systemAudioDump";
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license = lib.licenses.mit;
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platforms = lib.platforms.darwin;
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mainProgram = "system-audio-dump";
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};
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}
+17
tools/record/flake-module.nix
+17
tools/record/flake-module.nix
···
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{ ... }:
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{
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perSystem =
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{ pkgs, self', ... }:
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{
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packages.record = pkgs.writeShellApplication {
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name = "record";
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runtimeInputs = [
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pkgs.ffmpeg
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pkgs.gum
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]
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++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isLinux [ pkgs.pulseaudio ]
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++ pkgs.lib.optionals pkgs.stdenv.hostPlatform.isDarwin [ self'.packages.system-audio-dump ];
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text = builtins.readFile ./rec.sh;
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};
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};
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}
+97
tools/record/rec.sh
+97
tools/record/rec.sh
···
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#!/usr/bin/env bash
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set -euo pipefail
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list_sources() {
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if [[ "$OSTYPE" == "darwin"* ]]; then
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# macOS: list audio devices via ffmpeg avfoundation
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echo "system: System Audio (via ScreenCaptureKit)"
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ffmpeg -f avfoundation -list_devices true -i "" 2>&1 | \
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sed -n '/AVFoundation audio devices:/,/^[^[]/p' | \
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grep -E '^\[AVFoundation.*\[[0-9]+\]' | \
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sed 's/.*\[\([0-9]*\)\] \(.*\)/\1: \2/'
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else
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# Linux: list PulseAudio/PipeWire sources including monitors (for system audio)
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# Sources ending in .monitor capture the output of that sink (system audio)
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pactl list sources short | awk '{print $2}' | while read -r source; do
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if [[ "$source" == *.monitor ]]; then
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echo "$source (system audio)"
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else
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echo "$source"
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fi
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done
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fi
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}
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get_source_name() {
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# Strip the description suffix for actual recording
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local name="$1"
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echo "${name% (system audio)}"
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}
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record_source() {
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local source="$1"
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if [[ "$OSTYPE" == "darwin"* ]]; then
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if [[ "$source" == "system" ]]; then
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# Use system-audio-dump for system audio (ScreenCaptureKit)
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# Output is raw PCM 24kHz 16-bit stereo, convert to WAV for compatibility
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system-audio-dump | ffmpeg -f s16le -ar 24000 -ac 2 -i - -f wav -acodec pcm_s16le - 2>/dev/null
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else
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# Use avfoundation for mic input, source is the device index
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ffmpeg -f avfoundation -i ":${source}" -f wav -acodec pcm_s16le - 2>/dev/null
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fi
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else
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# Linux: use pulse
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ffmpeg -f pulse -i "$source" -f wav -acodec pcm_s16le - 2>/dev/null
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fi
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}
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# Show help
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if [[ "${1:-}" == "-h" ]] || [[ "${1:-}" == "--help" ]]; then
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echo "Usage: record [SOURCE]"
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echo ""
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echo "Record audio from a source and output WAV to stdout."
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echo "If no source is provided, prompts interactively with gum."
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echo ""
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echo "Options:"
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echo " -l, --list List available audio sources"
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echo " -h, --help Show this help"
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echo ""
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echo "System audio:"
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echo " Linux: Select a .monitor source (captures sink output)"
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echo " macOS: Use 'system' source (requires Screen Recording permission)"
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echo ""
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echo "Examples:"
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echo " record | mpv -"
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echo " record system | mpv - # macOS system audio"
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echo " record 0 | mpv - # macOS device index"
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echo " record alsa_output.pci-xxx.monitor | mpv - # Linux system audio"
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exit 0
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fi
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# List sources
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if [[ "${1:-}" == "-l" ]] || [[ "${1:-}" == "--list" ]]; then
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list_sources
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exit 0
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fi
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# Get source from argument or prompt
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if [[ -n "${1:-}" ]]; then
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SOURCE="$1"
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else
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# Use gum to select a source
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if [[ "$OSTYPE" == "darwin"* ]]; then
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SOURCE=$(list_sources | gum choose --header "Select audio source:" | cut -d: -f1)
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else
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SELECTION=$(list_sources | gum choose --header "Select audio source:")
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SOURCE=$(get_source_name "$SELECTION")
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fi
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fi
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if [[ -z "$SOURCE" ]]; then
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echo "Error: No source selected" >&2
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exit 1
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fi
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echo "Recording from: $SOURCE (Ctrl+C to stop)" >&2
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record_source "$SOURCE"