package playback

import "context"

// SyncFrame contains one video frame and its corresponding audio batch.
//
// Both payloads may borrow reader-owned memory and are valid only until the
// next ReadSync call or until the reader is closed.
type SyncFrame struct {
	Video VideoFrame
	Audio AudioFrame
}

// SyncReader reads synchronized audio/video pairs.
//
// ReadSync must not be called again until both frame payloads have been
// consumed.
type SyncReader interface {
	ReadSync(context.Context) (SyncFrame, error)
	Close() error
}

// SyncReaderFactory opens one synchronized reader for two configured feeds.
//
// Native MXL implementations may require the feeds to use the same domain.
// Future manual synchronization may support different domains behind another
// implementation of this interface.
type SyncReaderFactory interface {
	OpenSync(
		context.Context,
		FeedConfig,
		FeedConfig,
	) (SyncReader, error)
}