#!/bin/bash

# 1. Find the ASUS GC21 Video device
# We look for "GC21" specifically to ignore the AverMedia
DEVICE=$(v4l2-ctl --list-devices | grep -A 1 -i "GC21" | grep "/dev/video" | head -n 1 | xargs)

if [ -z "$DEVICE" ]; then
    echo "❌ Error: ASUS GC21 Webcam not found!"
    exit 1
fi

echo "✅ Found Webcam at: $DEVICE"

# 2. Setup Audio Loopback for the Webcam mic
# This is useful if you want to hear yourself or test the mic
echo "🔊 Starting Webcam Mic Loopback..."
pactl unload-module module-loopback 2>/dev/null
pactl load-module module-loopback latency_msec=40 source_dont_move=true

# 3. Find the ASUS Audio source and set volume
SOURCE_NAME=$(pactl list sources short | grep -i "GC21" | awk '{print $2}')
if [ ! -z "$SOURCE_NAME" ]; then
    pactl set-source-volume "$SOURCE_NAME" 70%
fi

echo "📸 Launching Webcam Preview..."

# 4. Launch ffplay
# Note: Most internal webcaps are 1280x720 or 1920x1080 at 30fps.
# I added -vf "format=yuv420p" to ensure it looks right on your HDR screen.
ffplay -hide_banner -alwaysontop \
    -f v4l2 -video_size 1920x1080 -framerate 30 -i "$DEVICE" \
    -vf "format=yuv420p" \
    -fflags nobuffer -flags low_delay -framedrop -an

# 5. Cleanup
echo "🧹 Cleaning up audio..."
pactl unload-module module-loopback