refactor: extract streaming engine into internal/flinger
Move the capture/encode/send pipeline out of cmd/teleportfling into a GUI-free Engine so the CLI and the desktop app share one implementation: - flinger: Config/Engine/Status, audio+video+stats loops, pattern source - config: JSON persistence at ~/.config/teleportfling/config.json - cmd/teleportfling: thin CLI wrapper around the engine (same flags) - golangci: extend exclusions to flinger/config
This commit is contained in:
@@ -0,0 +1,113 @@
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// Package config loads and saves the teleportfling settings file.
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//
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// The file is JSON at ~/.config/teleportfling/config.json and holds the
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// user-visible knobs exposed by the GUI (name, port, quality, fps, source,
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// audio, monitor). Secrets and runtime state are deliberately excluded.
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package config
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import (
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"encoding/json"
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"errors"
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"os"
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"path/filepath"
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"teleportfling/internal/flinger"
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)
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// Config mirrors flinger.Config with JSON tags for persistence.
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type Config struct {
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Name string `json:"name"`
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Port int `json:"port"`
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Quality int `json:"quality"`
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FPS int `json:"fps"`
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Source string `json:"source"`
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Audio bool `json:"audio"`
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StreamIndex int `json:"stream_index"`
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}
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// Default returns the default configuration.
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func Default() Config {
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c := flinger.DefaultConfig()
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return Config{
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Name: c.Name,
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Port: c.Port,
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Quality: c.Quality,
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FPS: c.FPS,
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Source: c.Source,
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Audio: c.Audio,
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StreamIndex: c.StreamIndex,
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}
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}
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// ToFlinger converts a persisted config to the engine config.
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func (c Config) ToFlinger() flinger.Config {
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return flinger.Config{
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Name: c.Name,
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Port: c.Port,
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Quality: c.Quality,
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FPS: c.FPS,
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Source: c.Source,
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Audio: c.Audio,
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StreamIndex: c.StreamIndex,
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}
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}
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// pathVar is the config file location; overridable in tests.
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var pathVar = func() string {
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dir, err := os.UserConfigDir()
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if err != nil {
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dir = "."
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}
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return filepath.Join(dir, "teleportfling", "config.json")
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}()
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// Path returns the config file location.
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func Path() string {
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return pathVar
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}
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// Load reads the config file, returning Default when it does not exist.
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func Load() (Config, error) {
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p := Path()
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data, err := os.ReadFile(p)
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if err != nil {
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if errors.Is(err, os.ErrNotExist) {
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return Default(), nil
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}
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return Config{}, err
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}
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var c Config
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if err := json.Unmarshal(data, &c); err != nil {
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return Config{}, err
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}
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// Fill any zero values with defaults so a hand-edited file still works.
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d := Default()
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if c.Port == 0 {
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c.Port = d.Port
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}
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if c.Quality == 0 {
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c.Quality = d.Quality
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}
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if c.FPS == 0 {
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c.FPS = d.FPS
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}
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if c.Source == "" {
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c.Source = d.Source
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}
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return c, nil
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}
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// Save writes the config file, creating the directory if needed.
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func Save(c Config) error {
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p := Path()
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if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
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return err
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}
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data, err := json.MarshalIndent(c, "", " ")
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if err != nil {
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return err
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}
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return os.WriteFile(p, data, 0o600)
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}
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@@ -0,0 +1,77 @@
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package config
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import (
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"os"
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"path/filepath"
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"testing"
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)
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// TestLoadDefaultsWhenMissing verifies Load returns defaults when the file
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// does not exist.
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func TestLoadDefaultsWhenMissing(t *testing.T) {
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// Point at a non-existent directory so we never touch the real config.
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old := pathVar
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pathVar = filepath.Join(t.TempDir(), "nope", "config.json")
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defer func() { pathVar = old }()
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c, err := Load()
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if err != nil {
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t.Fatalf("Load: %v", err)
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}
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if c.Port != 9756 {
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t.Errorf("default port = %d, want 9756", c.Port)
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}
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}
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// TestSaveLoadRoundTrip writes a config and reads it back.
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func TestSaveLoadRoundTrip(t *testing.T) {
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old := pathVar
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pathVar = filepath.Join(t.TempDir(), "config.json")
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defer func() { pathVar = old }()
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want := Config{
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Name: "Studio",
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Port: 9898,
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Quality: 95,
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FPS: 60,
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Source: "pattern",
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Audio: false,
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StreamIndex: 1,
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}
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if err := Save(want); err != nil {
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t.Fatalf("Save: %v", err)
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}
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got, err := Load()
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if err != nil {
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t.Fatalf("Load: %v", err)
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}
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if got != want {
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t.Errorf("round trip mismatch:\n got %+v\nwant %+v", got, want)
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}
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}
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// TestLoadFillsZeroValues ensures a partial file gets defaults filled.
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func TestLoadFillsZeroValues(t *testing.T) {
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old := pathVar
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pathVar = filepath.Join(t.TempDir(), "config.json")
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defer func() { pathVar = old }()
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if err := os.WriteFile(pathVar, []byte(`{"name":"Partial"}`), 0o600); err != nil {
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t.Fatalf("write: %v", err)
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}
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c, err := Load()
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if err != nil {
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t.Fatalf("Load: %v", err)
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}
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if c.Name != "Partial" {
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t.Errorf("name = %q, want Partial", c.Name)
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}
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if c.Port != 9756 {
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t.Errorf("port = %d, want filled default 9756", c.Port)
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}
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if c.Quality != 80 {
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t.Errorf("quality = %d, want filled default 80", c.Quality)
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}
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}
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@@ -0,0 +1,423 @@
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// Package flinger implements the TeleportFling streaming engine: it captures
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// a screen (and optionally system audio), encodes video to JPEG, packetizes
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// both into the Teleport protocol, and broadcasts them to connected OBS
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// receivers.
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//
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// The engine is deliberately GUI-free so it can run headless (CLI/daemon) or
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// be driven by a desktop app. Callers create an Engine with a Config, call
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// Start, poll Status, and call Stop when done.
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package flinger
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import (
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"errors"
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"image"
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"image/color"
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"io"
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"log"
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"strconv"
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"sync/atomic"
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"time"
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"teleportfling/internal/capture"
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"teleportfling/internal/discovery"
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"teleportfling/internal/output"
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"teleportfling/internal/protocol"
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)
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const (
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// sampleRate and speakers describe the captured/encoded audio stream.
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sampleRate = 48000
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speakers = 2
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// audioChunk sets how much audio we packetize per WAVE message (~10 ms).
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audioChunk = 10 * time.Millisecond
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)
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// Config configures the streaming engine.
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type Config struct {
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// Name is the announce name advertised to receivers (empty → hostname).
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Name string
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// Port is the TCP listening port for receivers.
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Port int
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// Quality is the JPEG quality, 1–100.
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Quality int
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// FPS is the target video frame rate.
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FPS int
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// Source is "screen" (PipeWire) or "pattern" (synthetic test signal).
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Source string
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// Audio enables system audio capture and streaming.
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Audio bool
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// StreamIndex selects which monitor to capture (screen source only).
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StreamIndex int
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}
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// DefaultConfig returns the recommended defaults.
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func DefaultConfig() Config {
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return Config{
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Port: 9756,
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Quality: 80,
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FPS: 30,
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Source: "screen",
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Audio: true,
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}
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}
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// Status is a point-in-time snapshot of the running engine.
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type Status struct {
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Running bool
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Frames int64
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Conns int
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}
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// Engine owns the capture, encode and send pipeline.
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type Engine struct {
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cfg Config
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sender *output.Sender
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announcer *discovery.Announcer
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encoder *protocol.JPEGEncoder
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cam capture.Capture
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loop frameSource
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start time.Time
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stop chan struct{}
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frames atomic.Int64
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}
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// New creates an engine from cfg. Capture is opened eagerly so that
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// misconfiguration (e.g. no screen-share permission) surfaces before Start.
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func New(cfg Config) (*Engine, error) {
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e := &Engine{cfg: cfg}
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sender := output.New()
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if _, err := sender.Listen(addr(cfg.Port)); err != nil {
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return nil, err
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}
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enc, err := protocol.NewJPEGEncoder()
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if err != nil {
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sender.Close()
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return nil, err
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}
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e.sender = sender
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e.encoder = enc
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switch cfg.Source {
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case "screen":
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cam, err := capture.OpenPipeWire(cfg.StreamIndex, cfg.Audio)
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if err != nil {
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e.encoder.Close()
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sender.Close()
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return nil, err
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}
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e.cam = cam
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e.loop = captureLoop{cam}
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case "pattern":
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e.loop = &patternLoop{w: 1920, h: 1080}
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default:
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e.encoder.Close()
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sender.Close()
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return nil, errors.New("unknown source " + cfg.Source)
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}
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return e, nil
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}
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// Start begins the audio, video and stats loops and starts announcing the
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// stream. It is idempotent.
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func (e *Engine) Start() {
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if e.stop != nil {
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return
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}
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e.start = time.Now()
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e.stop = make(chan struct{})
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e.announcer = discovery.Start(e.cfg.Name, e.sender.Port())
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var src io.ReadCloser
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switch {
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case e.cam == nil:
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src = capture.NewSilenceSource()
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case e.cam.Audio() != nil:
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src = e.cam.Audio()
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default:
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log.Printf("flinger: system audio unavailable, streaming silence")
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src = capture.NewSilenceSource()
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}
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go e.audioLoop(src)
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go e.videoLoop()
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go e.statsLoop()
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}
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// Stop halts the loops, stops announcing and closes all resources. It is
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// idempotent. After Stop the engine must not be restarted.
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func (e *Engine) Stop() {
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if e.stop == nil {
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return
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}
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close(e.stop)
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// Give the loops a moment to observe the stop signal.
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time.Sleep(50 * time.Millisecond)
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if e.announcer != nil {
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e.announcer.Stop()
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}
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e.sender.Close()
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e.encoder.Close()
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if e.cam != nil {
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if err := e.cam.Close(); err != nil {
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log.Printf("flinger: capture close: %v", err)
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}
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}
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}
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// Status returns a snapshot of the running engine.
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func (e *Engine) Status() Status {
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return Status{
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Running: e.stop != nil,
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Frames: e.frames.Load(),
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Conns: e.sender.NumConns(),
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}
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}
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// audioLoop reads raw PCM and emits WAVE packets. start is the shared
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// reference clock used by the video loop so audio and video timestamps stay
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// aligned on the receiver.
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func (e *Engine) audioLoop(src io.ReadCloser) {
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defer func() { _ = src.Close() }()
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framesPerChunk := int(sampleRate) * int(audioChunk) / int(time.Second)
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chunkBytes := framesPerChunk * speakers * 2 // S16
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buf := make([]byte, chunkBytes)
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for {
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n, err := io.ReadFull(src, buf)
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if n > 0 {
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frames := n / (speakers * 2)
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ts := uint64(time.Since(e.start))
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packet, perr := protocol.BuildWavePacket(ts, protocol.AudioFormatS16, sampleRate, speakers, int32(frames), buf[:n])
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if perr != nil {
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log.Printf("flinger: wave: %v", perr)
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} else {
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e.sender.Send(packet)
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}
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}
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if err != nil {
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select {
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case <-e.stop:
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return
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default:
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}
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if !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrClosedPipe) {
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log.Printf("flinger: audio: %v", err)
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}
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}
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}
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}
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// videoLoop pulls frames and sends them at the configured fps.
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func (e *Engine) videoLoop() {
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frameInterval := time.Second / time.Duration(e.cfg.FPS)
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next := e.start
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for {
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frame, err := e.loop.Next()
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if err != nil {
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select {
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case <-e.stop:
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return
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default:
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}
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if !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrClosedPipe) {
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log.Printf("flinger: capture: %v", err)
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}
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continue
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}
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// Drop frames when running ahead of the target fps to keep
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// timestamps monotonic (e.g. a 60 Hz monitor captured at 30 fps).
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now := time.Now()
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if now.Before(next) {
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continue
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}
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next = now.Add(frameInterval)
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ts := uint64(now.Sub(e.start))
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buf, err := e.encoder.EncodeBGRA(frame.Pix, frame.Width, frame.Height, e.cfg.Quality)
|
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if err != nil {
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log.Printf("flinger: jpeg: %v", err)
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continue
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}
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packet, err := protocol.WritePacket(
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protocol.Header{Type: protocol.VideoType, Timestamp: ts, Size: int32(len(buf))},
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ptr(protocol.DefaultBT709Full()),
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nil,
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buf,
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)
|
||||
if err != nil {
|
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log.Printf("flinger: packet: %v", err)
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continue
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}
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e.sender.Send(packet)
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e.frames.Add(1)
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}
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}
|
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|
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// statsLoop logs a periodic summary.
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func (e *Engine) statsLoop() {
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tick := time.NewTicker(5 * time.Second)
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defer tick.Stop()
|
||||
for {
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select {
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case <-tick.C:
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st := e.Status()
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log.Printf("flinger: %d frames, %d conns", st.Frames, st.Conns)
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||||
case <-e.stop:
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return
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// frameSource abstracts the frame source: real capture or the test pattern.
|
||||
type frameSource interface {
|
||||
Next() (*capture.VideoFrame, error)
|
||||
}
|
||||
|
||||
// captureLoop wraps the PipeWire capture backend.
|
||||
type captureLoop struct {
|
||||
cam capture.Capture
|
||||
}
|
||||
|
||||
func (c captureLoop) Next() (*capture.VideoFrame, error) {
|
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return c.cam.Video().NextFrame()
|
||||
}
|
||||
|
||||
// patternLoop synthesizes the M1 test pattern (colour bars + moving box).
|
||||
type patternLoop struct {
|
||||
w, h int
|
||||
seq int64
|
||||
}
|
||||
|
||||
func (p *patternLoop) Next() (*capture.VideoFrame, error) {
|
||||
img := testPattern(p.w, p.h, int(p.seq))
|
||||
p.seq++
|
||||
return ycrcbToBGRA(img), nil
|
||||
}
|
||||
|
||||
// ycrcbToBGRA converts a YCbCr image to a BGRA VideoFrame so both sources
|
||||
// share the encode path (EncodeBGRA).
|
||||
func ycrcbToBGRA(img *image.YCbCr) *capture.VideoFrame {
|
||||
w, h := img.Rect.Dx(), img.Rect.Dy()
|
||||
frame := &capture.VideoFrame{
|
||||
Pix: make([]byte, w*h*4),
|
||||
Width: w,
|
||||
Height: h,
|
||||
Stride: w * 4,
|
||||
}
|
||||
for y := 0; y < h; y++ {
|
||||
for x := 0; x < w; x++ {
|
||||
yi := y*img.YStride + x
|
||||
ci := (y/2)*img.CStride + x/2
|
||||
r, g, b := color.YCbCrToRGB(img.Y[yi], img.Cb[ci], img.Cr[ci])
|
||||
off := (y*w + x) * 4
|
||||
frame.Pix[off], frame.Pix[off+1], frame.Pix[off+2], frame.Pix[off+3] = b, g, r, 255
|
||||
}
|
||||
}
|
||||
return frame
|
||||
}
|
||||
|
||||
// ptr returns a pointer to v, for passing headers to WritePacket.
|
||||
func ptr[T any](v T) *T { return &v }
|
||||
|
||||
// addr formats a port as a listen address.
|
||||
func addr(port int) string {
|
||||
return ":" + strconv.Itoa(port)
|
||||
}
|
||||
|
||||
// testPattern renders a standard SMPTE colour bar with a moving white box at
|
||||
// the given frame index.
|
||||
func testPattern(w, h, frame int) *image.YCbCr {
|
||||
img := image.NewYCbCr(image.Rect(0, 0, w, h), image.YCbCrSubsampleRatio420)
|
||||
|
||||
// 7 vertical colour bars (grey, yellow, cyan, green, magenta, red, blue).
|
||||
bars := []color.RGBA{
|
||||
{R: 191, G: 191, B: 191}, // 75% grey
|
||||
{R: 191, G: 191, B: 0}, // yellow
|
||||
{R: 0, G: 191, B: 191}, // cyan
|
||||
{R: 0, G: 191, B: 0}, // green
|
||||
{R: 191, G: 0, B: 191}, // magenta
|
||||
{R: 191, G: 0, B: 0}, // red
|
||||
{R: 0, G: 0, B: 191}, // blue
|
||||
}
|
||||
|
||||
const barCount = 7
|
||||
barW := w / barCount
|
||||
const boxSize = 80
|
||||
|
||||
// Moving white box sweeps left→right across the lower black block.
|
||||
boxMinX := (frame*(w+boxSize)/120)%(w+boxSize) - boxSize/2
|
||||
|
||||
buf := make([]color.RGBA, w*h)
|
||||
for by := 0; by < h; by++ {
|
||||
rowIsBars := by < h*2/3
|
||||
for bx := 0; bx < w; bx++ {
|
||||
var c color.RGBA
|
||||
switch {
|
||||
case rowIsBars:
|
||||
idx := bx / barW
|
||||
if idx >= barCount {
|
||||
idx = barCount - 1
|
||||
}
|
||||
c = bars[idx]
|
||||
case by%8 < 4 && bx > w/3 && bx < w*2/3:
|
||||
c = color.RGBA{R: 255, G: 255, B: 255, A: 255}
|
||||
default:
|
||||
c = color.RGBA{}
|
||||
}
|
||||
if bx >= boxMinX && bx < boxMinX+boxSize && by >= h*2/3 {
|
||||
c = color.RGBA{R: 255, G: 255, B: 255, A: 255}
|
||||
}
|
||||
buf[by*w+bx] = c
|
||||
}
|
||||
}
|
||||
|
||||
// Chroma planes: average each 2x2 RGB block, then convert to Cb/Cr.
|
||||
for by := 0; by < h; by += 2 {
|
||||
for bx := 0; bx < w; bx += 2 {
|
||||
var rSum, gSum, bSum uint32
|
||||
n := uint32(0)
|
||||
for dy := 0; dy < 2; dy++ {
|
||||
for dx := 0; dx < 2; dx++ {
|
||||
xx, yy := bx+dx, by+dy
|
||||
if xx >= w || yy >= h {
|
||||
continue
|
||||
}
|
||||
px := buf[yy*w+xx]
|
||||
rSum += uint32(px.R)
|
||||
gSum += uint32(px.G)
|
||||
bSum += uint32(px.B)
|
||||
n++
|
||||
}
|
||||
}
|
||||
_, cb, cr := color.RGBToYCbCr(uint8(rSum/n), uint8(gSum/n), uint8(bSum/n))
|
||||
img.Cb[(by/2)*img.CStride+bx/2] = cb
|
||||
img.Cr[(by/2)*img.CStride+bx/2] = cr
|
||||
}
|
||||
}
|
||||
|
||||
// Luma plane: Y = YCbCr luma of every pixel.
|
||||
for by := 0; by < h; by++ {
|
||||
for bx := 0; bx < w; bx++ {
|
||||
px := buf[by*w+bx]
|
||||
y, _, _ := color.RGBToYCbCr(px.R, px.G, px.B)
|
||||
img.Y[by*img.YStride+bx] = y
|
||||
}
|
||||
}
|
||||
|
||||
return img
|
||||
}
|
||||
@@ -0,0 +1,92 @@
|
||||
package flinger
|
||||
|
||||
import (
|
||||
"net"
|
||||
"testing"
|
||||
"time"
|
||||
)
|
||||
|
||||
// TestEnginePatternStartStop runs the engine with the synthetic pattern source
|
||||
// and verifies it produces frames on the wire and stops cleanly.
|
||||
func TestEnginePatternStartStop(t *testing.T) {
|
||||
cfg := DefaultConfig()
|
||||
cfg.Source = "pattern"
|
||||
cfg.Port = 0 // ephemeral
|
||||
|
||||
eng, err := New(cfg)
|
||||
if err != nil {
|
||||
t.Fatalf("New: %v", err)
|
||||
}
|
||||
|
||||
eng.Start()
|
||||
defer eng.Stop()
|
||||
|
||||
// Connect a raw receiver and read until the engine reports frames sent.
|
||||
conn, err := net.Dial("tcp", "127.0.0.1:"+itoa(eng.sender.Port()))
|
||||
if err != nil {
|
||||
t.Fatalf("dial: %v", err)
|
||||
}
|
||||
defer func() { _ = conn.Close() }()
|
||||
|
||||
// The video loop sends ~30fps; wait for the counter to advance.
|
||||
deadline := time.Now().Add(3 * time.Second)
|
||||
_ = conn.SetReadDeadline(deadline)
|
||||
|
||||
// Drain whatever arrives while waiting for the frame counter to move.
|
||||
go func() {
|
||||
buf := make([]byte, 64*1024)
|
||||
for {
|
||||
if _, err := conn.Read(buf); err != nil {
|
||||
return
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
for time.Now().Before(deadline) {
|
||||
if eng.Status().Frames > 0 {
|
||||
break
|
||||
}
|
||||
time.Sleep(20 * time.Millisecond)
|
||||
}
|
||||
|
||||
if eng.Status().Frames == 0 {
|
||||
t.Error("expected frames to be counted")
|
||||
}
|
||||
}
|
||||
|
||||
// TestEngineConfigDefaults verifies DefaultConfig is sane.
|
||||
func TestEngineConfigDefaults(t *testing.T) {
|
||||
c := DefaultConfig()
|
||||
if c.Port != 9756 {
|
||||
t.Errorf("default port = %d, want 9756", c.Port)
|
||||
}
|
||||
if c.Source != "screen" {
|
||||
t.Errorf("default source = %q, want screen", c.Source)
|
||||
}
|
||||
if c.Quality < 1 || c.Quality > 100 {
|
||||
t.Errorf("default quality %d out of range", c.Quality)
|
||||
}
|
||||
}
|
||||
|
||||
// TestNewRejectsBadSource ensures invalid sources fail fast.
|
||||
func TestNewRejectsBadSource(t *testing.T) {
|
||||
cfg := DefaultConfig()
|
||||
cfg.Source = "bogus"
|
||||
if _, err := New(cfg); err == nil {
|
||||
t.Error("expected error for unknown source")
|
||||
}
|
||||
}
|
||||
|
||||
func itoa(v int) string {
|
||||
if v == 0 {
|
||||
return "0"
|
||||
}
|
||||
var buf [20]byte
|
||||
i := len(buf)
|
||||
for v > 0 {
|
||||
i--
|
||||
buf[i] = byte('0' + v%10)
|
||||
v /= 10
|
||||
}
|
||||
return string(buf[i:])
|
||||
}
|
||||
Reference in New Issue
Block a user