refactor(audio): rename audio-server flag to audio-output-server for clarity

docs: update development documentation with new make targets
refactor: simplify audio quality presets implementation
style: remove redundant comments and align error handling
chore: add lint-ui-fix target to Makefile

DEVELOPMENT.md

@@ -231,22 +231,102 @@ systemctl restart jetkvm
 cd ui && npm run lint
 ```
 
-### Local Code Quality Tools
+### Essential Makefile Targets
 
-The project includes several Makefile targets for local code quality checks that mirror the GitHub Actions workflows:
+The project includes several essential Makefile targets for development environment setup, building, and code quality:
+
+#### Development Environment Setup
 
 ```bash
-# Run Go linting (mirrors .github/workflows/lint.yml)
+# Set up complete development environment (recommended first step)
-make lint
+make dev_env
+# This runs setup_toolchain + build_audio_deps + installs Go tools
+# - Clones rv1106-system toolchain to $HOME/.jetkvm/rv1106-system
+# - Builds ALSA and Opus static libraries for ARM
+# - Installs goimports and other Go development tools
 
-# Run Go linting with auto-fix
+# Set up only the cross-compiler toolchain
-make lint-fix
+make setup_toolchain
 
-# Run UI linting (mirrors .github/workflows/ui-lint.yml)
+# Build only the audio dependencies (requires setup_toolchain)
-make ui-lint
+make build_audio_deps
 ```
 
-**Note:** The `lint` and `lint-fix` targets require audio dependencies. Run `make dev_env` first if you haven't already.
+#### Building
+
+```bash
+# Build development version with debug symbols
+make build_dev
+# Builds jetkvm_app with version like 0.4.7-dev20241222
+# Requires: make dev_env (for toolchain and audio dependencies)
+
+# Build release version (production)
+make build_release
+# Builds optimized release version
+# Requires: make dev_env and frontend build
+
+# Build test binaries for device testing
+make build_dev_test
+# Creates device-tests.tar.gz with all test binaries
+```
+
+#### Code Quality and Linting
+
+```bash
+# Run both Go and UI linting
+make lint
+
+# Run both Go and UI linting with auto-fix
+make lint-fix
+
+# Run only Go linting
+make lint-go
+
+# Run only Go linting with auto-fix
+make lint-go-fix
+
+# Run only UI linting
+make lint-ui
+
+# Run only UI linting with auto-fix
+make lint-ui-fix
+```
+
+**Note:** The Go linting targets (`lint-go`, `lint-go-fix`, and the combined `lint`/`lint-fix` targets) require audio dependencies. Run `make dev_env` first if you haven't already.
+
+### Development Deployment Script
+
+The `dev_deploy.sh` script is the primary tool for deploying your development changes to a JetKVM device:
+
+```bash
+# Basic deployment (builds and deploys everything)
+./dev_deploy.sh -r 192.168.1.100
+
+# Skip UI build for faster backend-only deployment
+./dev_deploy.sh -r 192.168.1.100 --skip-ui-build
+
+# Run Go tests on the device after deployment
+./dev_deploy.sh -r 192.168.1.100 --run-go-tests
+
+# Deploy with release build and install
+./dev_deploy.sh -r 192.168.1.100 -i
+
+# View all available options
+./dev_deploy.sh --help
+```
+
+**Key features:**
+- Automatically builds the Go backend with proper cross-compilation
+- Optionally builds the React frontend (unless `--skip-ui-build`)
+- Deploys binaries to the device via SSH/SCP
+- Restarts the JetKVM service
+- Can run tests on the device
+- Supports custom SSH user and various deployment options
+
+**Requirements:**
+- SSH access to your JetKVM device
+- `make dev_env` must be run first (for toolchain and audio dependencies)
+- Device IP address or hostname
 
 ### API Testing
 

Makefile

@@ -1,5 +1,5 @@
 # --- JetKVM Audio/Toolchain Dev Environment Setup ---
-.PHONY: setup_toolchain build_audio_deps dev_env lint lint-fix ui-lint
+.PHONY: setup_toolchain build_audio_deps dev_env lint lint-go lint-ui lint-fix lint-go-fix lint-ui-fix ui-lint
 
 # Clone the rv1106-system toolchain to $HOME/.jetkvm/rv1106-system
 setup_toolchain:
@@ -9,8 +9,10 @@ setup_toolchain:
 build_audio_deps: setup_toolchain
 	bash tools/build_audio_deps.sh $(ALSA_VERSION) $(OPUS_VERSION)
 
-# Prepare everything needed for local development (toolchain + audio deps)
+# Prepare everything needed for local development (toolchain + audio deps + Go tools)
 dev_env: build_audio_deps
+	@echo "Installing Go development tools..."
+	go install golang.org/x/tools/cmd/goimports@latest
 	@echo "Development environment ready."
 JETKVM_HOME ?= $(HOME)/.jetkvm
 TOOLCHAIN_DIR ?= $(JETKVM_HOME)/rv1106-system
@@ -127,8 +129,12 @@ release:
 	rclone copyto bin/jetkvm_app r2://jetkvm-update/app/$(VERSION)/jetkvm_app
 	rclone copyto bin/jetkvm_app.sha256 r2://jetkvm-update/app/$(VERSION)/jetkvm_app.sha256
 
+# Run both Go and UI linting
+lint: lint-go lint-ui
+	@echo "All linting completed successfully!"
+
 # Run golangci-lint locally with the same configuration as CI
-lint: build_audio_deps
+lint-go: build_audio_deps
 	@echo "Running golangci-lint..."
 	@mkdir -p static && touch static/.gitkeep
 	CGO_ENABLED=1 \
@@ -136,8 +142,12 @@ lint: build_audio_deps
 	CGO_LDFLAGS="-L$(AUDIO_LIBS_DIR)/alsa-lib-$(ALSA_VERSION)/src/.libs -lasound -L$(AUDIO_LIBS_DIR)/opus-$(OPUS_VERSION)/.libs -lopus -lm -ldl -static" \
 	golangci-lint run --verbose
 
+# Run both Go and UI linting with auto-fix
+lint-fix: lint-go-fix lint-ui-fix
+	@echo "All linting with auto-fix completed successfully!"
+
 # Run golangci-lint with auto-fix
-lint-fix: build_audio_deps
+lint-go-fix: build_audio_deps
 	@echo "Running golangci-lint with auto-fix..."
 	@mkdir -p static && touch static/.gitkeep
 	CGO_ENABLED=1 \
@@ -146,7 +156,16 @@ lint-fix: build_audio_deps
 	golangci-lint run --fix --verbose
 
 # Run UI linting locally (mirrors GitHub workflow ui-lint.yml)
-ui-lint:
+lint-ui:
 	@echo "Running UI lint..."
 	@cd ui && npm ci
 	@cd ui && npm run lint
+
+# Run UI linting with auto-fix
+lint-ui-fix:
+	@echo "Running UI lint with auto-fix..."
+	@cd ui && npm ci
+	@cd ui && npm run lint:fix
+
+# Legacy alias for UI linting (for backward compatibility)
+ui-lint: lint-ui

cmd/main.go

@@ -11,7 +11,7 @@ import (
 func main() {
 	versionPtr := flag.Bool("version", false, "print version and exit")
 	versionJsonPtr := flag.Bool("version-json", false, "print version as json and exit")
-	audioServerPtr := flag.Bool("audio-server", false, "Run as audio server subprocess")
+	audioServerPtr := flag.Bool("audio-output-server", false, "Run as audio server subprocess")
 	audioInputServerPtr := flag.Bool("audio-input-server", false, "Run as audio input server subprocess")
 	flag.Parse()
 

internal/audio/api.go

@@ -15,7 +15,7 @@ var (
 // isAudioServerProcess detects if we're running as the audio server subprocess
 func isAudioServerProcess() bool {
 	for _, arg := range os.Args {
-		if strings.Contains(arg, "--audio-server") {
+		if strings.Contains(arg, "--audio-output-server") {
 			return true
 		}
 	}

internal/audio/audio.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"sync/atomic"
 	"time"
-	// Explicit import for CGO audio stream glue
 )
 
 var (
@@ -33,7 +32,7 @@ type AudioConfig struct {
 }
 
 // AudioMetrics tracks audio performance metrics
-// Note: 64-bit fields must be first for proper alignment on 32-bit ARM
+
 type AudioMetrics struct {
 	FramesReceived  int64
 	FramesDropped   int64
@@ -61,72 +60,67 @@ var (
 	metrics AudioMetrics
 )
 
-// GetAudioQualityPresets returns predefined quality configurations
+// qualityPresets defines the base quality configurations
-func GetAudioQualityPresets() map[AudioQuality]AudioConfig {
+var qualityPresets = map[AudioQuality]struct {
-	return map[AudioQuality]AudioConfig{
+	outputBitrate, inputBitrate int
+	sampleRate, channels        int
+	frameSize                   time.Duration
+}{
 	AudioQualityLow: {
-			Quality:    AudioQualityLow,
+		outputBitrate: 32, inputBitrate: 16,
-			Bitrate:    32,
+		sampleRate: 22050, channels: 1,
-			SampleRate: 22050,
+		frameSize: 40 * time.Millisecond,
-			Channels:   1,
-			FrameSize:  40 * time.Millisecond,
 	},
 	AudioQualityMedium: {
-			Quality:    AudioQualityMedium,
+		outputBitrate: 64, inputBitrate: 32,
-			Bitrate:    64,
+		sampleRate: 44100, channels: 2,
-			SampleRate: 44100,
+		frameSize: 20 * time.Millisecond,
-			Channels:   2,
-			FrameSize:  20 * time.Millisecond,
 	},
 	AudioQualityHigh: {
-			Quality:    AudioQualityHigh,
+		outputBitrate: 128, inputBitrate: 64,
-			Bitrate:    128,
+		sampleRate: 48000, channels: 2,
-			SampleRate: 48000,
+		frameSize: 20 * time.Millisecond,
-			Channels:   2,
-			FrameSize:  20 * time.Millisecond,
 	},
 	AudioQualityUltra: {
-			Quality:    AudioQualityUltra,
+		outputBitrate: 192, inputBitrate: 96,
-			Bitrate:    192,
+		sampleRate: 48000, channels: 2,
-			SampleRate: 48000,
+		frameSize: 10 * time.Millisecond,
-			Channels:   2,
-			FrameSize:  10 * time.Millisecond,
 	},
+}
+
+// GetAudioQualityPresets returns predefined quality configurations for audio output
+func GetAudioQualityPresets() map[AudioQuality]AudioConfig {
+	result := make(map[AudioQuality]AudioConfig)
+	for quality, preset := range qualityPresets {
+		result[quality] = AudioConfig{
+			Quality:    quality,
+			Bitrate:    preset.outputBitrate,
+			SampleRate: preset.sampleRate,
+			Channels:   preset.channels,
+			FrameSize:  preset.frameSize,
 		}
+	}
+	return result
 }
 
 // GetMicrophoneQualityPresets returns predefined quality configurations for microphone input
 func GetMicrophoneQualityPresets() map[AudioQuality]AudioConfig {
-	return map[AudioQuality]AudioConfig{
+	result := make(map[AudioQuality]AudioConfig)
-		AudioQualityLow: {
+	for quality, preset := range qualityPresets {
-			Quality:    AudioQualityLow,
+		result[quality] = AudioConfig{
-			Bitrate:    16,
+			Quality: quality,
-			SampleRate: 16000,
+			Bitrate: preset.inputBitrate,
-			Channels:   1,
+			SampleRate: func() int {
-			FrameSize:  40 * time.Millisecond,
+				if quality == AudioQualityLow {
-		},
+					return 16000
-		AudioQualityMedium: {
-			Quality:    AudioQualityMedium,
-			Bitrate:    32,
-			SampleRate: 22050,
-			Channels:   1,
-			FrameSize:  20 * time.Millisecond,
-		},
-		AudioQualityHigh: {
-			Quality:    AudioQualityHigh,
-			Bitrate:    64,
-			SampleRate: 44100,
-			Channels:   1,
-			FrameSize:  20 * time.Millisecond,
-		},
-		AudioQualityUltra: {
-			Quality:    AudioQualityUltra,
-			Bitrate:    96,
-			SampleRate: 48000,
-			Channels:   1,
-			FrameSize:  10 * time.Millisecond,
-		},
 				}
+				return preset.sampleRate
+			}(),
+			Channels:  1, // Microphone is always mono
+			FrameSize: preset.frameSize,
+		}
+	}
+	return result
 }
 
 // SetAudioQuality updates the current audio quality configuration

internal/audio/cgo_audio.go

@@ -410,9 +410,7 @@ func cgoAudioClose() {
 	C.jetkvm_audio_close()
 }
 
-// Optimized read and encode with pre-allocated error objects and reduced checks
 func cgoAudioReadEncode(buf []byte) (int, error) {
-	// Fast path: check minimum buffer size (reduced from 1500 to 1276 for 10ms frames)
 	if len(buf) < 1276 {
 		return 0, errBufferTooSmall
 	}
@@ -427,11 +425,11 @@ func cgoAudioReadEncode(buf []byte) (int, error) {
 	return int(n), nil
 }
 
-// Go wrappers for audio playback (microphone input)
+// Audio playback functions
 func cgoAudioPlaybackInit() error {
 	ret := C.jetkvm_audio_playback_init()
 	if ret != 0 {
-		return errors.New("failed to init ALSA playback/Opus decoder")
+		return errAudioPlaybackInit
 	}
 	return nil
 }
@@ -440,44 +438,36 @@ func cgoAudioPlaybackClose() {
 	C.jetkvm_audio_playback_close()
 }
 
-// Decodes Opus frame and writes to playback device
 func cgoAudioDecodeWrite(buf []byte) (int, error) {
 	if len(buf) == 0 {
-		return 0, errors.New("empty buffer")
+		return 0, errEmptyBuffer
 	}
-	// Additional safety check to prevent segfault
 	if buf == nil {
-		return 0, errors.New("nil buffer")
+		return 0, errNilBuffer
+	}
+	if len(buf) > 4096 {
+		return 0, errBufferTooLarge
 	}
 
-	// Validate buffer size to prevent potential overruns
-	if len(buf) > 4096 { // Maximum reasonable Opus frame size
-		return 0, errors.New("buffer too large")
-	}
-
-	// Ensure buffer is not deallocated by keeping a reference
 	bufPtr := unsafe.Pointer(&buf[0])
 	if bufPtr == nil {
-		return 0, errors.New("invalid buffer pointer")
+		return 0, errInvalidBufferPtr
 	}
 
-	// Add recovery mechanism for C function crashes
 	defer func() {
 		if r := recover(); r != nil {
-			// Log the panic but don't crash the entire program
+			_ = r
-			// This should not happen with proper validation, but provides safety
-			_ = r // Explicitly ignore the panic value
 		}
 	}()
 
 	n := C.jetkvm_audio_decode_write(bufPtr, C.int(len(buf)))
 	if n < 0 {
-		return 0, errors.New("audio decode/write error")
+		return 0, errAudioDecodeWrite
 	}
 	return int(n), nil
 }
 
-// Wrapper functions for non-blocking audio manager
+// CGO function aliases
 var (
 	CGOAudioInit          = cgoAudioInit
 	CGOAudioClose         = cgoAudioClose

internal/audio/input.go

@@ -9,9 +9,8 @@ import (
 )
 
 // AudioInputMetrics holds metrics for microphone input
-// Note: int64 fields must be 64-bit aligned for atomic operations on ARM
 type AudioInputMetrics struct {
-	FramesSent      int64 // Must be first for alignment
+	FramesSent      int64
 	FramesDropped   int64
 	BytesProcessed  int64
 	ConnectionDrops int64
@@ -21,7 +20,6 @@ type AudioInputMetrics struct {
 
 // AudioInputManager manages microphone input stream using IPC mode only
 type AudioInputManager struct {
-	// metrics MUST be first for ARM32 alignment (contains int64 fields)
 	metrics AudioInputMetrics
 
 	ipcManager *AudioInputIPCManager

internal/audio/supervisor.go

@@ -248,7 +248,7 @@ func (s *AudioServerSupervisor) startProcess() error {
 	defer s.mutex.Unlock()
 
 	// Create new command
-	s.cmd = exec.CommandContext(s.ctx, execPath, "--audio-server")
+	s.cmd = exec.CommandContext(s.ctx, execPath, "--audio-output-server")
 	s.cmd.Stdout = os.Stdout
 	s.cmd.Stderr = os.Stderr
 
@@ -261,7 +261,7 @@ func (s *AudioServerSupervisor) startProcess() error {
 	s.logger.Info().Int("pid", s.processPID).Msg("audio server process started")
 
 	// Add process to monitoring
-	s.processMonitor.AddProcess(s.processPID, "audio-server")
+	s.processMonitor.AddProcess(s.processPID, "audio-output-server")
 
 	if s.onProcessStart != nil {
 		s.onProcessStart(s.processPID)