2nd/10_Wiki/Topics/Domain_Programming/Coding/Android_ExoPlayer_Patterns.md

id, title, category, status, source_trust_level, verification_status, created_at, updated_at, tags, tech_stack, applied_in, aliases

id	title	category	status	source_trust_level	verification_status	created_at	updated_at	tags	tech_stack	applied_in	aliases
android-exoplayer-patterns	Android Media3 ExoPlayer — 비디오 / 오디오	Coding	draft	B	conceptual	2026-05-09	2026-05-09	android media3 exoplayer vibe-coding	language applicable_to Kotlin / androidx.media3 Android		ExoPlayer MediaItem DASH HLS MediaSession

Android Media3 ExoPlayer

표준 미디어 player. Adaptive streaming (HLS/DASH) + DRM + offline + cast 지원. 옛 com.google.android.exoplayer2 대신 androidx.media3 (Media3) 사용.

📖 핵심 개념

• ExoPlayer: 단일 player.
• MediaItem: 재생 항목 (URI + metadata).
• MediaSource: HLS / DASH / 일반.
• MediaSession: 시스템 (잠금화면 / Bluetooth) 통합.

💻 코드 패턴

기본 셋업

implementation("androidx.media3:media3-exoplayer:1.4.0")
implementation("androidx.media3:media3-ui:1.4.0")
implementation("androidx.media3:media3-exoplayer-hls:1.4.0")

class PlayerViewModel : ViewModel() {
    val player: ExoPlayer = ExoPlayer.Builder(context).build()

    init {
        player.setMediaItem(MediaItem.fromUri("https://example.com/stream.m3u8"))
        player.prepare()
        player.playWhenReady = true
    }

    override fun onCleared() {
        player.release()
    }
}

Compose

@Composable
fun VideoPlayer(player: ExoPlayer) {
    AndroidView(factory = { ctx ->
        PlayerView(ctx).apply {
            this.player = player
            useController = true
        }
    })
}

DisposableEffect(Unit) {
    onDispose { player.release() }
}

HLS / DASH

val mediaItem = MediaItem.Builder()
    .setUri("https://example.com/stream.m3u8")
    .setMimeType(MimeTypes.APPLICATION_M3U8)
    .build()

val source = HlsMediaSource.Factory(DefaultHttpDataSource.Factory())
    .createMediaSource(mediaItem)

player.setMediaSource(source)

MediaSession (잠금화면)

class PlaybackService : MediaSessionService() {
    private lateinit var session: MediaSession

    override fun onCreate() {
        super.onCreate()
        val player = ExoPlayer.Builder(this).build()
        session = MediaSession.Builder(this, player).build()
    }

    override fun onGetSession(controllerInfo: MediaSession.ControllerInfo): MediaSession = session

    override fun onDestroy() { session.release(); super.onDestroy() }
}

Listener — buffering / error

player.addListener(object : Player.Listener {
    override fun onPlaybackStateChanged(state: Int) {
        when (state) {
            Player.STATE_BUFFERING -> showSpinner()
            Player.STATE_READY -> hideSpinner()
            Player.STATE_ENDED -> onEnded()
        }
    }
    override fun onPlayerError(error: PlaybackException) {
        log.error("Playback error", error)
    }
})

DRM (Widevine)

val drmConfig = MediaItem.DrmConfiguration.Builder(C.WIDEVINE_UUID)
    .setLicenseUri(licenseUrl)
    .setMultiSession(true)
    .build()

val mediaItem = MediaItem.Builder()
    .setUri(streamUrl)
    .setDrmConfiguration(drmConfig)
    .build()

🤔 의사결정 기준

상황	도구
영상 재생 (mp4)	ExoPlayer Builder
Live streaming	HLS / DASH MediaSource
Background audio	MediaSessionService
Cast	Cast extension
DRM	DrmConfiguration
짧은 효과음	SoundPool 또는 MediaPlayer (가벼움)

❌ 안티패턴

• player.release() 누락: 메모리 / surface leak.
• 여러 화면이 같은 player 인스턴스 + 미관리: surface 충돌.
• lifecycle 안 맞춤: 백그라운드에서도 영상 디코딩 → 배터리 / 데이터.
• error 무시: 사용자 멈춤 화면. retry button.
• 너무 큰 buffer: 메모리 폭발. LoadControl 조정.
• DRM 토큰 만료 후 재시도 X: 영상 멈춤.

🤖 LLM 활용 힌트

• 신규 = androidx.media3 (옛 exoplayer2 X).
• 백그라운드 audio = MediaSessionService.

🔗 관련 문서

• Android_Lifecycle_Aware_Components
• Android_Compose_State_Hoisting