VideoPlayer.kt

import androidx.compose.desktop.SwingPanel
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.size
import androidx.compose.material.Button
import androidx.compose.material.Text
import androidx.compose.runtime.*
import androidx.compose.ui.ExperimentalComposeUiApi
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Window
import androidx.compose.ui.window.application
import uk.co.caprica.vlcj.factory.discovery.NativeDiscovery
import uk.co.caprica.vlcj.player.component.CallbackMediaPlayerComponent

@ExperimentalComposeUiApi
fun main(args: Array<String>) = application {
    Window {
        Column(
            modifier = Modifier.fillMaxSize()
        ) {
            val playerState = remember { PlayerState() }

            VideoPlayer(
                modifier = Modifier.size(300.dp),
                url = "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4",
                playerState = playerState
            )

            @Suppress("SameParameterValue")
            PlayPauseButton(
                isPlay = playerState.isPlay(),
                onPlayClicked = {
                    playerState.play()
                },
                onPauseClicked = {
                    playerState.pause()
                }
            )

        }
    }
}

@Composable
fun PlayPauseButton(
    modifier: Modifier = Modifier,
    isPlay: Boolean,
    onPlayClicked: () -> Unit,
    onPauseClicked: () -> Unit
) {
    Button(
        modifier = modifier,
        onClick = {
            if (isPlay) {
                onPauseClicked()
            } else {
                onPlayClicked()
            }
        },
    ) {
        Text(
            if (isPlay) {
                "PAUSE"
            } else {
                "PLAY"
            }
        )
    }
}

private class PlayerState {
    var playPause by mutableStateOf(true)

    fun play() {
        playPause = true
    }


    fun pause() {
        playPause = false
    }

    fun isPlay() = playPause
    fun isPause() = !playPause
}


@Composable
private fun VideoPlayer(
    modifier: Modifier = Modifier,
    url: String,
    playerState: PlayerState
) {
    println("Video player for $url")
    NativeDiscovery().discover()
    val mediaPlayerComponent = remember { CallbackMediaPlayerComponent() }

    LaunchedEffect(Unit) {
        val ok = mediaPlayerComponent.mediaPlayer().media().play(url)
        println("play gave $ok")
    }

    // Play/Pause control
    mediaPlayerComponent.mediaPlayer().controls().let { controls ->
        if (playerState.isPlay()) {
            controls.play()
        }

        if (playerState.isPause()) {
            controls.pause()
        }
    }

    return SwingPanel(
        background = Color.Transparent,
        modifier = modifier,
        factory = {
            mediaPlayerComponent
        }
    )
}