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1#!/usr/bin/env bash
2set -euo pipefail
3
4list_sources() {
5 if [[ "$OSTYPE" == "darwin"* ]]; then
6 # macOS: list audio devices via ffmpeg avfoundation
7 echo "system: System Audio (via ScreenCaptureKit)"
8 ffmpeg -f avfoundation -list_devices true -i "" 2>&1 | \
9 sed -n '/AVFoundation audio devices:/,/^[^[]/p' | \
10 grep -E '^\[AVFoundation.*\[[0-9]+\]' | \
11 sed 's/.*\[\([0-9]*\)\] \(.*\)/\1: \2/'
12 else
13 # Linux: list PulseAudio/PipeWire sources including monitors (for system audio)
14 # Sources ending in .monitor capture the output of that sink (system audio)
15 pactl list sources short | awk '{print $2}' | while read -r source; do
16 if [[ "$source" == *.monitor ]]; then
17 echo "$source (system audio)"
18 else
19 echo "$source"
20 fi
21 done
22 fi
23}
24
25get_source_name() {
26 # Strip the description suffix for actual recording
27 local name="$1"
28 echo "${name% (system audio)}"
29}
30
31record_source() {
32 local source="$1"
33
34 if [[ "$OSTYPE" == "darwin"* ]]; then
35 if [[ "$source" == "system" ]]; then
36 # Use system-audio-dump for system audio (ScreenCaptureKit)
37 # Output is raw PCM 24kHz 16-bit stereo, convert to WAV for compatibility
38 system-audio-dump | ffmpeg -f s16le -ar 24000 -ac 2 -i - -f wav -acodec pcm_s16le - 2>/dev/null
39 else
40 # Use avfoundation for mic input, source is the device index
41 ffmpeg -f avfoundation -i ":${source}" -f wav -acodec pcm_s16le - 2>/dev/null
42 fi
43 else
44 # Linux: use pulse
45 ffmpeg -f pulse -i "$source" -f wav -acodec pcm_s16le - 2>/dev/null
46 fi
47}
48
49# Show help
50if [[ "${1:-}" == "-h" ]] || [[ "${1:-}" == "--help" ]]; then
51 echo "Usage: record [SOURCE]"
52 echo ""
53 echo "Record audio from a source and output WAV to stdout."
54 echo "If no source is provided, prompts interactively with gum."
55 echo ""
56 echo "Options:"
57 echo " -l, --list List available audio sources"
58 echo " -h, --help Show this help"
59 echo ""
60 echo "System audio:"
61 echo " Linux: Select a .monitor source (captures sink output)"
62 echo " macOS: Use 'system' source (requires Screen Recording permission)"
63 echo ""
64 echo "Examples:"
65 echo " record | mpv -"
66 echo " record system | mpv - # macOS system audio"
67 echo " record 0 | mpv - # macOS device index"
68 echo " record alsa_output.pci-xxx.monitor | mpv - # Linux system audio"
69 exit 0
70fi
71
72# List sources
73if [[ "${1:-}" == "-l" ]] || [[ "${1:-}" == "--list" ]]; then
74 list_sources
75 exit 0
76fi
77
78# Get source from argument or prompt
79if [[ -n "${1:-}" ]]; then
80 SOURCE="$1"
81else
82 # Use gum to select a source
83 if [[ "$OSTYPE" == "darwin"* ]]; then
84 SOURCE=$(list_sources | gum choose --header "Select audio source:" | cut -d: -f1)
85 else
86 SELECTION=$(list_sources | gum choose --header "Select audio source:")
87 SOURCE=$(get_source_name "$SELECTION")
88 fi
89fi
90
91if [[ -z "$SOURCE" ]]; then
92 echo "Error: No source selected" >&2
93 exit 1
94fi
95
96echo "Recording from: $SOURCE (Ctrl+C to stop)" >&2
97record_source "$SOURCE"