script to output bluetooth audio device name and current audio codec in use

bt-codec.sh

#!/bin/bash
#
# bt-codec.sh - Display Bluetooth audio device names and active codecs
#
# Usage: ./bt-codec.sh
# Output: Device Name - Codec (e.g., "soundcore P31i - AAC")
#
# Requires: PulseAudio or PipeWire with pactl command
#

set -euo pipefail

# Check if pactl is available
if ! command -v pactl &>/dev/null; then
    echo "Error: pactl not found. Install pulseaudio-utils or pipewire-pulse." >&2
    exit 1
fi

# Get all card info from PulseAudio/PipeWire
cards_output=$(pactl list cards 2>/dev/null)

# Check if any Bluetooth cards exist
if ! echo "$cards_output" | grep -q "bluez_card"; then
    echo "No Bluetooth audio devices connected."
    exit 0
fi

# Process each Bluetooth card section
echo "$cards_output" | awk '
    # Start tracking when we find a Bluetooth card
    /Name:.*bluez_card/ {
        in_bt_card = 1
        device = ""
        active_profile = ""
        delete profiles  # Clear profiles array for new card
    }

    # Capture the device description (friendly name)
    in_bt_card && /device.description/ {
        # Extract text between quotes
        match($0, /"([^"]+)"/, arr)
        device = arr[1]
    }

    # Capture the active profile name
    in_bt_card && /Active Profile:/ {
        active_profile = $3
    }

    # We are in the Profiles section - store profile descriptions
    in_bt_card && /^\t\toff:/ { in_profiles = 1 }

    # Match profile lines and extract codec info
    # Format: "profile-name: Description (codec NAME)"
    in_bt_card && in_profiles && /^\t\t[a-z]/ {
        # Get profile name (everything before the colon)
        match($0, /^\t\t([^:]+):/, name_arr)
        profile_name = name_arr[1]

        # Extract codec from description if present
        if (match($0, /codec ([A-Za-z0-9_-]+)/, codec_arr)) {
            profiles[profile_name] = codec_arr[1]
        } else {
            profiles[profile_name] = profile_name
        }
    }

    # End of card section - output results
    in_bt_card && /^Card #[0-9]+$/ && device != "" {
        if (active_profile in profiles) {
            print device " - " profiles[active_profile]
        } else if (active_profile != "") {
            print device " - " active_profile
        }
        in_bt_card = 0
        in_profiles = 0
    }

    # Handle last card in output (no trailing "Card #" marker)
    END {
        if (in_bt_card && device != "" && active_profile != "") {
            if (active_profile in profiles) {
                print device " - " profiles[active_profile]
            } else {
                print device " - " active_profile
            }
        }
    }
'