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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
protocol EventSubscriber: AnyObject {
var uid: Int { get }
func handle(event: EventHelper.Event)
}
extension EventSubscriber {
var uid: Int { get { return Int(bitPattern: ObjectIdentifier(self)) }}
}
extension EventHelper {
typealias wakeup_cb = (@convention(c) (UnsafeMutableRawPointer?) -> Void)?
struct Event {
var id: String {
get { name + (name.starts(with: "MPV_EVENT_") ? "" : String(format.rawValue)) }
}
var idReset: String {
get { name + (name.starts(with: "MPV_EVENT_") ? "" : String(MPV_FORMAT_NONE.rawValue)) }
}
let name: String
let format: mpv_format
let string: String?
let bool: Bool?
let double: Double?
init(
name: String = "",
format: mpv_format = MPV_FORMAT_NONE,
string: String? = nil,
bool: Bool? = nil,
double: Double? = nil
) {
self.name = name
self.format = format
self.string = string
self.bool = bool
self.double = double
}
}
}
public class EventHelper: NSObject {
var mpv: OpaquePointer?
var events: [String:[Int:EventSubscriber]] = [:]
@objc init(_ mpvHandle: OpaquePointer) {
self.mpv = mpvHandle
super.init()
mpv_set_wakeup_callback(mpvHandle, wakeup, TypeHelper.bridge(obj: self))
}
func subscribe(_ subscriber: any EventSubscriber, event: Event) {
guard let mpv = mpv else { return }
if !event.name.isEmpty {
if !events.keys.contains(event.idReset) {
events[event.idReset] = [:]
}
if !events.keys.contains(event.id) {
mpv_observe_property(mpv, 0, event.name, event.format)
events[event.id] = [:]
}
events[event.idReset]?[subscriber.uid] = subscriber
events[event.id]?[subscriber.uid] = subscriber
}
}
let wakeup: wakeup_cb = { ( ctx ) in
let event = unsafeBitCast(ctx, to: EventHelper.self)
DispatchQueue.main.async { event.eventLoop() }
}
func eventLoop() {
while let mpv = mpv, let event = mpv_wait_event(mpv, 0) {
if event.pointee.event_id == MPV_EVENT_NONE { break }
handle(event: event)
}
}
func handle(event: UnsafeMutablePointer<mpv_event>) {
switch event.pointee.event_id {
case MPV_EVENT_PROPERTY_CHANGE:
handle(property: event)
default:
for (_, subscriber) in events[String(describing: event.pointee.event_id)] ?? [:] {
subscriber.handle(event: .init(name: String(describing: event.pointee.event_id)))
}
}
if event.pointee.event_id == MPV_EVENT_SHUTDOWN {
mpv_destroy(mpv)
mpv = nil
}
}
func handle(property mpvEvent: UnsafeMutablePointer<mpv_event>) {
let pData = OpaquePointer(mpvEvent.pointee.data)
guard let property = UnsafePointer<mpv_event_property>(pData)?.pointee else {
return
}
let name = String(cString: property.name)
let format = property.format
for (_, subscriber) in events[name + String(format.rawValue)] ?? [:] {
var event: Event? = nil
switch format {
case MPV_FORMAT_STRING:
event = .init(name: name, format: format, string: TypeHelper.toString(property.data))
case MPV_FORMAT_FLAG:
event = .init(name: name, format: format, bool: TypeHelper.toBool(property.data))
case MPV_FORMAT_DOUBLE:
event = .init(name: name, format: format, double: TypeHelper.toDouble(property.data))
case MPV_FORMAT_NONE:
event = .init(name: name, format: format)
default: break
}
if let e = event { subscriber.handle(event: e) }
}
}
}
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