WorldWind Kotlin/earth.worldwind.render.video/FFmpegVideoTexture

FFmpegVideoTexture

class FFmpegVideoTexture(val mediaUrl: String, width: Int, height: Int, tryHardwareDecode: Boolean = true) : CallbackVideoTexture, VideoPlayback

JVM video texture driven by direct javacpp-presets FFmpeg — no JavaCV wrapper. A worker thread runs the demux→decode→scale loop by hand:

av_read_frame → AVPacket
avcodec_send_packet / avcodec_receive_frame → AVFrame in source pixel format
(optional) av_hwframe_transfer_data → AVFrame in CPU-accessible format
sws_scale → AVFrame in packed BGRA
Copy BGRA bytes into a heap ByteArray and push to the CallbackVideoTexture base.

Compare with JavaCvVideoTexture which does the same in ~50 lines via org.bytedeco.javacv.FFmpegFrameGrabber. The raw path exists for pedagogy and as a starting point for hardware acceleration / custom codec selection / frame seeking.

Runtime requirement: org.bytedeco:javacv-platform (or org.bytedeco:ffmpeg with the host classifier) on the classpath.

Constructors

FFmpegVideoTexture

constructor(mediaUrl: String, width: Int, height: Int, tryHardwareDecode: Boolean = true)

Properties

byteCount

val byteCount: Int

coordTransform

val coordTransform: Matrix3

generateMipmaps

var generateMipmaps: Boolean

Caller opt-out for mipmap generation.

hardwareAcceleratedDecode

val hardwareAcceleratedDecode: Boolean

True after play if FFmpeg picked a hardware decoder for the source codec.

height

val height: Int

mediaUrl

val mediaUrl: String

Filesystem path or URL to the media.

target

val target: Int

timeMs

open override val timeMs: Long

Current playback time in milliseconds since playback started.

width

val width: Int

Functions

bindTexture

open override fun bindTexture(dc: DrawContext): Boolean

getTexParameter

fun getTexParameter(name: Int): Int

getTextureName

fun getTextureName(dc: DrawContext): KglTexture

pause

open override fun pause()

Pause playback. The current frame stays on the texture; resumable via play.

play

open override fun play()

Start (or resume) playback. Re-entrant — calling on an already-running player is a no-op.

release

open override fun release(dc: DrawContext)

Frees any resources associated with this instance. After this method returns the rendering resource is invalid, and any associated GL object is deleted.

open override fun release()

Free decoder + native resources. After release the texture is unusable.

setTexParameter

fun setTexParameter(name: Int, param: Int)

stop

open override fun stop()

Stop playback and rewind to the start.