test: add JACK looper plugin test script

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

test-jack-looper.sh

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+#!/bin/bash
+
+# jack-looper-test.sh - Test audio routing for the jack-looper Carla plugin
+
+set -e
+
+# Configuration
+PLUGIN_BINARY="./jack-looper"  # Adjust path to your compiled binary
+TEST_DURATION=5                # seconds
+TEST_FREQ=440                  # Hz
+TEST_AMP=0.5                   # amplitude
+SAMPLE_RATE=48000              # must match JACK server
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+echo -e "${YELLOW}=== JACK Looper Plugin Test ===${NC}"
+
+# 1. Check if JACK is running, start if not
+if ! jack_wait -c 2>/dev/null; then
+    echo -e "${YELLOW}Starting JACK server...${NC}"
+    jackd -d alsa -r $SAMPLE_RATE -p 1024 -n 2 &
+    JACK_PID=$!
+    sleep 2
+    if ! jack_wait -c; then
+        echo -e "${RED}Failed to start JACK server${NC}"
+        exit 1
+    fi
+    echo -e "${GREEN}JACK server started (PID: $JACK_PID)${NC}"
+else
+    echo -e "${GREEN}JACK server already running${NC}"
+fi
+
+# 2. Start the plugin
+echo -e "${YELLOW}Starting plugin...${NC}"
+$PLUGIN_BINARY &
+PLUGIN_PID=$!
+sleep 1
+
+# Check if plugin is running
+if ! kill -0 $PLUGIN_PID 2>/dev/null; then
+    echo -e "${RED}Plugin failed to start${NC}"
+    exit 1
+fi
+echo -e "${GREEN}Plugin started (PID: $PLUGIN_PID)${NC}"
+
+# 3. List available JACK ports
+echo -e "${YELLOW}Available JACK ports:${NC}"
+jack_lsp
+
+# 4. Connect system capture to plugin input
+echo -e "${YELLOW}Connecting system capture to plugin input...${NC}"
+jack_connect system:capture_1 "$PLUGIN_BINARY:in_1" 2>/dev/null || true
+jack_connect system:capture_2 "$PLUGIN_BINARY:in_2" 2>/dev/null || true
+
+# 5. Connect plugin output to system playback
+echo -e "${YELLOW}Connecting plugin output to system playback...${NC}"
+jack_connect "$PLUGIN_BINARY:out_1" system:playback_1 2>/dev/null || true
+jack_connect "$PLUGIN_BINARY:out_2" system:playback_2 2>/dev/null || true
+
+# 6. Generate a test tone and play it through system capture
+echo -e "${YELLOW}Playing test tone (${TEST_FREQ}Hz) for ${TEST_DURATION} seconds...${NC}"
+
+# Generate sine wave and play through JACK
+python3 -c "
+import numpy as np
+import jack
+import time
+
+client = jack.Client('test_tone')
+client.activate()
+
+# Create output port
+out_port = client.outports.register('out_1')
+
+# Generate sine wave
+sample_rate = $SAMPLE_RATE
+duration = $TEST_DURATION
+frequency = $TEST_FREQ
+amplitude = $TEST_AMP
+
+t = np.linspace(0, duration, int(sample_rate * duration), endpoint=False)
+sine_wave = (amplitude * np.sin(2 * np.pi * frequency * t)).astype(np.float32)
+
+# Play the tone
+chunk_size = 1024
+for i in range(0, len(sine_wave), chunk_size):
+    chunk = sine_wave[i:i+chunk_size]
+    if len(chunk) < chunk_size:
+        chunk = np.pad(chunk, (0, chunk_size - len(chunk)), 'constant')
+    out_port.get_array()[:] = chunk
+    time.sleep(chunk_size / sample_rate)
+
+client.deactivate()
+" &
+
+TONE_PID=$!
+sleep $TEST_DURATION
+
+# 7. Record the output to verify routing
+echo -e "${YELLOW}Recording output for verification...${NC}"
+
+# Record using jack_capture or jack_rec
+if command -v jack_capture &> /dev/null; then
+    jack_capture --duration $TEST_DURATION --filename test_output.wav --port "$PLUGIN_BINARY:out_1" "$PLUGIN_BINARY:out_2"
+elif command -v jack_rec &> /dev/null; then
+    jack_rec -f test_output.wav -d $TEST_DURATION -p "$PLUGIN_BINARY:out_1" -p "$PLUGIN_BINARY:out_2"
+else
+    echo -e "${YELLOW}No recording tool found (jack_capture or jack_rec). Skipping recording.${NC}"
+fi
+
+# 8. Cleanup
+echo -e "${YELLOW}Cleaning up...${NC}"
+kill $TONE_PID 2>/dev/null || true
+kill $PLUGIN_PID 2>/dev/null || true
+sleep 1
+
+# Stop JACK if we started it
+if [ -n "$JACK_PID" ]; then
+    kill $JACK_PID 2>/dev/null || true
+fi
+
+echo -e "${GREEN}=== Test Complete ===${NC}"
+
+# Check if recording was made
+if [ -f test_output.wav ]; then
+    echo -e "${GREEN}Recording saved to test_output.wav${NC}"
+    echo -e "${YELLOW}You can play it back with: aplay test_output.wav${NC}"
+fi