Pull request

Description

The goal of this PR is to introduce "thumbnail" seeking to Pillarbox. DASH stream may have image track to display Bitmap image in a [ImageOutput] set on the player [player.setImageOutput].

CoreBusiness also provide SpriteSheet within Chapter. The idea here is to have exactly the same behavior with external sprite sheet than it was inside a dash stream.

Integrators can customize the way Bitmap are loaded from a SpriteSheet, for example with Coil:

val player = PillarboxExoPlayer(application) {
        srgAssetLoader(application) {
            spriteSheetLoader { spriteSheet, onComplete ->
                val request = ImageRequest.Builder(application)
                    .data(spriteSheet.url)
                    .scale(Scale.FILL) // FILL to have the source image size!
                    .allowConversionToBitmap(enable = true)
                    .target { result ->
                        val bitmap = (result as BitmapDrawable).bitmap
                        onComplete(bitmap)
                    }
                    .build()
                imageLoader.enqueue(request)
            }
        }
    }

Changes made

• Add [ImageOutpt] to the [SmoothSeekingState].
• Add a demo illustrating how to use thumbnails.
• CoreBusiness parse Chapter SpriteSheets and set them to the player.

Checklist

• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).