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servo/components/script/dom/htmlmediaelement.rs
Swarnim Arun 3bf3a7861a Implement HTMLMediaElement.loop Attribute
2019-04-26 23:13:18 +05:30

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use crate::document_loader::{LoadBlocker, LoadType};
use crate::dom::attr::Attr;
use crate::dom::audiotrack::AudioTrack;
use crate::dom::audiotracklist::AudioTrackList;
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::AttrBinding::AttrMethods;
use crate::dom::bindings::codegen::Bindings::HTMLMediaElementBinding::CanPlayTypeResult;
use crate::dom::bindings::codegen::Bindings::HTMLMediaElementBinding::HTMLMediaElementConstants;
use crate::dom::bindings::codegen::Bindings::HTMLMediaElementBinding::HTMLMediaElementMethods;
use crate::dom::bindings::codegen::Bindings::HTMLSourceElementBinding::HTMLSourceElementMethods;
use crate::dom::bindings::codegen::Bindings::MediaErrorBinding::MediaErrorConstants::*;
use crate::dom::bindings::codegen::Bindings::MediaErrorBinding::MediaErrorMethods;
use crate::dom::bindings::codegen::Bindings::TextTrackBinding::{TextTrackKind, TextTrackMode};
use crate::dom::bindings::codegen::InheritTypes::{ElementTypeId, HTMLElementTypeId};
use crate::dom::bindings::codegen::InheritTypes::{HTMLMediaElementTypeId, NodeTypeId};
use crate::dom::bindings::codegen::UnionTypes::{
MediaStreamOrBlob, VideoTrackOrAudioTrackOrTextTrack,
};
use crate::dom::bindings::error::{Error, ErrorResult, Fallible};
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::num::Finite;
use crate::dom::bindings::refcounted::Trusted;
use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::root::{Dom, DomRoot, LayoutDom, MutNullableDom};
use crate::dom::bindings::str::{DOMString, USVString};
use crate::dom::blob::Blob;
use crate::dom::document::Document;
use crate::dom::element::{AttributeMutation, Element};
use crate::dom::event::Event;
use crate::dom::eventtarget::EventTarget;
use crate::dom::globalscope::GlobalScope;
use crate::dom::htmlelement::HTMLElement;
use crate::dom::htmlsourceelement::HTMLSourceElement;
use crate::dom::htmlvideoelement::HTMLVideoElement;
use crate::dom::mediaerror::MediaError;
use crate::dom::mediastream::MediaStream;
use crate::dom::node::{document_from_node, window_from_node, Node, NodeDamage, UnbindContext};
use crate::dom::performanceresourcetiming::InitiatorType;
use crate::dom::promise::Promise;
use crate::dom::texttrack::TextTrack;
use crate::dom::texttracklist::TextTrackList;
use crate::dom::timeranges::{TimeRanges, TimeRangesContainer};
use crate::dom::trackevent::TrackEvent;
use crate::dom::url::URL;
use crate::dom::videotrack::VideoTrack;
use crate::dom::videotracklist::VideoTrackList;
use crate::dom::virtualmethods::VirtualMethods;
use crate::fetch::FetchCanceller;
use crate::microtask::{Microtask, MicrotaskRunnable};
use crate::network_listener::{self, NetworkListener, PreInvoke, ResourceTimingListener};
use crate::script_thread::ScriptThread;
use crate::task_source::TaskSource;
use dom_struct::dom_struct;
use headers_core::HeaderMapExt;
use headers_ext::{ContentLength, ContentRange};
use html5ever::{LocalName, Prefix};
use http::header::{self, HeaderMap, HeaderValue};
use ipc_channel::ipc;
use ipc_channel::router::ROUTER;
use mime::{self, Mime};
use net_traits::image::base::Image;
use net_traits::image_cache::ImageResponse;
use net_traits::request::{CredentialsMode, Destination, RequestBuilder};
use net_traits::{CoreResourceMsg, FetchChannels, FetchMetadata, FetchResponseListener, Metadata};
use net_traits::{NetworkError, ResourceFetchTiming, ResourceTimingType};
use script_layout_interface::HTMLMediaData;
use servo_config::pref;
use servo_media::player::frame::{Frame, FrameRenderer};
use servo_media::player::{PlaybackState, Player, PlayerError, PlayerEvent, StreamType};
use servo_media::ServoMedia;
use servo_url::ServoUrl;
use std::cell::Cell;
use std::collections::VecDeque;
use std::f64;
use std::mem;
use std::rc::Rc;
use std::sync::{Arc, Mutex};
use time::{self, Duration, Timespec};
use webrender_api::{ImageData, ImageDescriptor, ImageFormat, ImageKey, RenderApi};
use webrender_api::{RenderApiSender, Transaction};
pub struct MediaFrameRenderer {
api: RenderApi,
current_frame: Option<(ImageKey, i32, i32)>,
old_frame: Option<ImageKey>,
very_old_frame: Option<ImageKey>,
}
impl MediaFrameRenderer {
fn new(render_api_sender: RenderApiSender) -> Self {
Self {
api: render_api_sender.create_api(),
current_frame: None,
old_frame: None,
very_old_frame: None,
}
}
fn render_poster_frame(&mut self, image: Arc<Image>) {
if let Some(image_id) = image.id {
self.current_frame = Some((image_id, image.width as i32, image.height as i32));
}
}
}
impl FrameRenderer for MediaFrameRenderer {
fn render(&mut self, frame: Frame) {
let descriptor = ImageDescriptor::new(
frame.get_width(),
frame.get_height(),
ImageFormat::BGRA8,
false,
false,
);
let mut txn = Transaction::new();
let image_data = ImageData::Raw(frame.get_data().clone());
if let Some(old_image_key) = mem::replace(&mut self.very_old_frame, self.old_frame.take()) {
txn.delete_image(old_image_key);
}
match self.current_frame {
Some((ref image_key, ref mut width, ref mut height))
if *width == frame.get_width() && *height == frame.get_height() =>
{
txn.update_image(
*image_key,
descriptor,
image_data,
&webrender_api::DirtyRect::All,
);
if let Some(old_image_key) = self.old_frame.take() {
txn.delete_image(old_image_key);
}
}
Some((ref mut image_key, ref mut width, ref mut height)) => {
self.old_frame = Some(*image_key);
let new_image_key = self.api.generate_image_key();
txn.add_image(new_image_key, descriptor, image_data, None);
*image_key = new_image_key;
*width = frame.get_width();
*height = frame.get_height();
},
None => {
let image_key = self.api.generate_image_key();
txn.add_image(image_key, descriptor, image_data, None);
self.current_frame = Some((image_key, frame.get_width(), frame.get_height()));
},
}
self.api.update_resources(txn.resource_updates);
}
}
#[must_root]
#[derive(JSTraceable, MallocSizeOf)]
enum SrcObject {
MediaStream(Dom<MediaStream>),
Blob(Dom<Blob>),
}
impl From<MediaStreamOrBlob> for SrcObject {
#[allow(unrooted_must_root)]
fn from(src_object: MediaStreamOrBlob) -> SrcObject {
match src_object {
MediaStreamOrBlob::Blob(blob) => SrcObject::Blob(Dom::from_ref(&*blob)),
MediaStreamOrBlob::MediaStream(stream) => {
SrcObject::MediaStream(Dom::from_ref(&*stream))
},
}
}
}
#[dom_struct]
pub struct HTMLMediaElement {
htmlelement: HTMLElement,
/// <https://html.spec.whatwg.org/multipage/#dom-media-networkstate>
network_state: Cell<NetworkState>,
/// <https://html.spec.whatwg.org/multipage/#dom-media-readystate>
ready_state: Cell<ReadyState>,
/// <https://html.spec.whatwg.org/multipage/#dom-media-srcobject>
src_object: DomRefCell<Option<SrcObject>>,
/// <https://html.spec.whatwg.org/multipage/#dom-media-currentsrc>
current_src: DomRefCell<String>,
/// Incremented whenever tasks associated with this element are cancelled.
generation_id: Cell<u32>,
/// <https://html.spec.whatwg.org/multipage/#fire-loadeddata>
///
/// Reset to false every time the load algorithm is invoked.
fired_loadeddata_event: Cell<bool>,
/// <https://html.spec.whatwg.org/multipage/#dom-media-error>
error: MutNullableDom<MediaError>,
/// <https://html.spec.whatwg.org/multipage/#dom-media-paused>
paused: Cell<bool>,
/// <https://html.spec.whatwg.org/multipage/#dom-media-defaultplaybackrate>
defaultPlaybackRate: Cell<f64>,
/// <https://html.spec.whatwg.org/multipage/#dom-media-playbackrate>
playbackRate: Cell<f64>,
/// <https://html.spec.whatwg.org/multipage/#attr-media-autoplay>
autoplaying: Cell<bool>,
/// <https://html.spec.whatwg.org/multipage/#delaying-the-load-event-flag>
delaying_the_load_event_flag: DomRefCell<Option<LoadBlocker>>,
/// <https://html.spec.whatwg.org/multipage/#list-of-pending-play-promises>
#[ignore_malloc_size_of = "promises are hard"]
pending_play_promises: DomRefCell<Vec<Rc<Promise>>>,
/// Play promises which are soon to be fulfilled by a queued task.
#[ignore_malloc_size_of = "promises are hard"]
in_flight_play_promises_queue: DomRefCell<VecDeque<(Box<[Rc<Promise>]>, ErrorResult)>>,
#[ignore_malloc_size_of = "servo_media"]
player: DomRefCell<Option<Box<Player>>>,
#[ignore_malloc_size_of = "Arc"]
frame_renderer: Arc<Mutex<MediaFrameRenderer>>,
/// https://html.spec.whatwg.org/multipage/#show-poster-flag
show_poster: Cell<bool>,
/// https://html.spec.whatwg.org/multipage/#dom-media-duration
duration: Cell<f64>,
/// https://html.spec.whatwg.org/multipage/#official-playback-position
playback_position: Cell<f64>,
/// https://html.spec.whatwg.org/multipage/#default-playback-start-position
default_playback_start_position: Cell<f64>,
/// https://html.spec.whatwg.org/multipage/#dom-media-volume
volume: Cell<f64>,
/// https://html.spec.whatwg.org/multipage/#dom-media-seeking
seeking: Cell<bool>,
/// https://html.spec.whatwg.org/multipage/#dom-media-muted
muted: Cell<bool>,
/// URL of the media resource, if any.
resource_url: DomRefCell<Option<ServoUrl>>,
/// URL of the media resource, if the resource is set through the src_object attribute and it
/// is a blob.
blob_url: DomRefCell<Option<ServoUrl>>,
/// https://html.spec.whatwg.org/multipage/#dom-media-played
#[ignore_malloc_size_of = "Rc"]
played: DomRefCell<TimeRangesContainer>,
// https://html.spec.whatwg.org/multipage/#dom-media-audiotracks
audio_tracks_list: MutNullableDom<AudioTrackList>,
// https://html.spec.whatwg.org/multipage/#dom-media-videotracks
video_tracks_list: MutNullableDom<VideoTrackList>,
/// https://html.spec.whatwg.org/multipage/#dom-media-texttracks
text_tracks_list: MutNullableDom<TextTrackList>,
/// Time of last timeupdate notification.
#[ignore_malloc_size_of = "Defined in time"]
next_timeupdate_event: Cell<Timespec>,
/// Latest fetch request context.
current_fetch_context: DomRefCell<Option<HTMLMediaElementFetchContext>>,
}
/// <https://html.spec.whatwg.org/multipage/#dom-media-networkstate>
#[derive(Clone, Copy, JSTraceable, MallocSizeOf, PartialEq)]
#[repr(u8)]
pub enum NetworkState {
Empty = HTMLMediaElementConstants::NETWORK_EMPTY as u8,
Idle = HTMLMediaElementConstants::NETWORK_IDLE as u8,
Loading = HTMLMediaElementConstants::NETWORK_LOADING as u8,
NoSource = HTMLMediaElementConstants::NETWORK_NO_SOURCE as u8,
}
/// <https://html.spec.whatwg.org/multipage/#dom-media-readystate>
#[derive(Clone, Copy, Debug, JSTraceable, MallocSizeOf, PartialEq, PartialOrd)]
#[repr(u8)]
pub enum ReadyState {
HaveNothing = HTMLMediaElementConstants::HAVE_NOTHING as u8,
HaveMetadata = HTMLMediaElementConstants::HAVE_METADATA as u8,
HaveCurrentData = HTMLMediaElementConstants::HAVE_CURRENT_DATA as u8,
HaveFutureData = HTMLMediaElementConstants::HAVE_FUTURE_DATA as u8,
HaveEnoughData = HTMLMediaElementConstants::HAVE_ENOUGH_DATA as u8,
}
impl HTMLMediaElement {
pub fn new_inherited(tag_name: LocalName, prefix: Option<Prefix>, document: &Document) -> Self {
Self {
htmlelement: HTMLElement::new_inherited(tag_name, prefix, document),
network_state: Cell::new(NetworkState::Empty),
ready_state: Cell::new(ReadyState::HaveNothing),
src_object: Default::default(),
current_src: DomRefCell::new("".to_owned()),
generation_id: Cell::new(0),
fired_loadeddata_event: Cell::new(false),
error: Default::default(),
paused: Cell::new(true),
defaultPlaybackRate: Cell::new(1.0),
playbackRate: Cell::new(1.0),
muted: Cell::new(false),
// FIXME(nox): Why is this initialised to true?
autoplaying: Cell::new(true),
delaying_the_load_event_flag: Default::default(),
pending_play_promises: Default::default(),
in_flight_play_promises_queue: Default::default(),
player: Default::default(),
frame_renderer: Arc::new(Mutex::new(MediaFrameRenderer::new(
document.window().get_webrender_api_sender(),
))),
show_poster: Cell::new(true),
duration: Cell::new(f64::NAN),
playback_position: Cell::new(0.),
default_playback_start_position: Cell::new(0.),
volume: Cell::new(1.0),
seeking: Cell::new(false),
resource_url: DomRefCell::new(None),
blob_url: DomRefCell::new(None),
played: DomRefCell::new(TimeRangesContainer::new()),
audio_tracks_list: Default::default(),
video_tracks_list: Default::default(),
text_tracks_list: Default::default(),
next_timeupdate_event: Cell::new(time::get_time() + Duration::milliseconds(250)),
current_fetch_context: DomRefCell::new(None),
}
}
pub fn get_ready_state(&self) -> ReadyState {
self.ready_state.get()
}
fn media_type_id(&self) -> HTMLMediaElementTypeId {
match self.upcast::<Node>().type_id() {
NodeTypeId::Element(ElementTypeId::HTMLElement(
HTMLElementTypeId::HTMLMediaElement(media_type_id),
)) => media_type_id,
_ => unreachable!(),
}
}
fn play_media(&self) {
if let Some(ref player) = *self.player.borrow() {
if let Err(e) = player.set_rate(self.playbackRate.get()) {
warn!("Could not set the playback rate {:?}", e);
}
if let Err(e) = player.play() {
warn!("Could not play media {:?}", e);
}
}
}
/// Marks that element as delaying the load event or not.
///
/// Nothing happens if the element was already delaying the load event and
/// we pass true to that method again.
///
/// <https://html.spec.whatwg.org/multipage/#delaying-the-load-event-flag>
pub fn delay_load_event(&self, delay: bool) {
let mut blocker = self.delaying_the_load_event_flag.borrow_mut();
if delay && blocker.is_none() {
*blocker = Some(LoadBlocker::new(&document_from_node(self), LoadType::Media));
} else if !delay && blocker.is_some() {
LoadBlocker::terminate(&mut *blocker);
}
}
/// https://html.spec.whatwg.org/multipage/#time-marches-on
fn time_marches_on(&self) {
// Step 6.
if time::get_time() > self.next_timeupdate_event.get() {
let window = window_from_node(self);
window
.task_manager()
.media_element_task_source()
.queue_simple_event(self.upcast(), atom!("timeupdate"), &window);
self.next_timeupdate_event
.set(time::get_time() + Duration::milliseconds(350));
}
}
/// <https://html.spec.whatwg.org/multipage/#internal-pause-steps>
fn internal_pause_steps(&self) {
// Step 1.
self.autoplaying.set(false);
// Step 2.
if !self.Paused() {
// Step 2.1.
self.paused.set(true);
// Step 2.2.
self.take_pending_play_promises(Err(Error::Abort));
// Step 2.3.
let window = window_from_node(self);
let this = Trusted::new(self);
let generation_id = self.generation_id.get();
let _ = window.task_manager().media_element_task_source().queue(
task!(internal_pause_steps: move || {
let this = this.root();
if generation_id != this.generation_id.get() {
return;
}
this.fulfill_in_flight_play_promises(|| {
// Step 2.3.1.
this.upcast::<EventTarget>().fire_event(atom!("timeupdate"));
// Step 2.3.2.
this.upcast::<EventTarget>().fire_event(atom!("pause"));
if let Some(ref player) = *this.player.borrow() {
if let Err(e) = player.pause() {
eprintln!("Could not pause player {:?}", e);
}
}
// Step 2.3.3.
// Done after running this closure in
// `fulfill_in_flight_play_promises`.
});
}),
window.upcast(),
);
// Step 2.4.
// FIXME(nox): Set the official playback position to the current
// playback position.
}
}
// https://html.spec.whatwg.org/multipage/#allowed-to-play
fn is_allowed_to_play(&self) -> bool {
true
}
// https://html.spec.whatwg.org/multipage/#notify-about-playing
fn notify_about_playing(&self) {
// Step 1.
self.take_pending_play_promises(Ok(()));
// Step 2.
let window = window_from_node(self);
let this = Trusted::new(self);
let generation_id = self.generation_id.get();
// FIXME(nox): Why are errors silenced here?
let _ = window.task_manager().media_element_task_source().queue(
task!(notify_about_playing: move || {
let this = this.root();
if generation_id != this.generation_id.get() {
return;
}
this.fulfill_in_flight_play_promises(|| {
// Step 2.1.
this.upcast::<EventTarget>().fire_event(atom!("playing"));
this.play_media();
// Step 2.2.
// Done after running this closure in
// `fulfill_in_flight_play_promises`.
});
}),
window.upcast(),
);
}
// https://html.spec.whatwg.org/multipage/#ready-states
fn change_ready_state(&self, ready_state: ReadyState) {
let old_ready_state = self.ready_state.get();
self.ready_state.set(ready_state);
if self.network_state.get() == NetworkState::Empty {
return;
}
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
// Step 1.
match (old_ready_state, ready_state) {
(ReadyState::HaveNothing, ReadyState::HaveMetadata) => {
task_source.queue_simple_event(self.upcast(), atom!("loadedmetadata"), &window);
// No other steps are applicable in this case.
return;
},
(ReadyState::HaveMetadata, new) if new >= ReadyState::HaveCurrentData => {
if !self.fired_loadeddata_event.get() {
self.fired_loadeddata_event.set(true);
let this = Trusted::new(self);
// FIXME(nox): Why are errors silenced here?
let _ = task_source.queue(
task!(media_reached_current_data: move || {
let this = this.root();
this.upcast::<EventTarget>().fire_event(atom!("loadeddata"));
this.delay_load_event(false);
}),
window.upcast(),
);
}
// Steps for the transition from HaveMetadata to HaveCurrentData
// or HaveFutureData also apply here, as per the next match
// expression.
},
(ReadyState::HaveFutureData, new) if new <= ReadyState::HaveCurrentData => {
// FIXME(nox): Queue a task to fire timeupdate and waiting
// events if the conditions call from the spec are met.
// No other steps are applicable in this case.
return;
},
_ => (),
}
if old_ready_state <= ReadyState::HaveCurrentData &&
ready_state >= ReadyState::HaveFutureData
{
task_source.queue_simple_event(self.upcast(), atom!("canplay"), &window);
if !self.Paused() {
self.notify_about_playing();
}
}
if ready_state == ReadyState::HaveEnoughData {
// TODO: Check sandboxed automatic features browsing context flag.
// FIXME(nox): I have no idea what this TODO is about.
// FIXME(nox): Review this block.
if self.autoplaying.get() && self.Paused() && self.Autoplay() {
// Step 1
self.paused.set(false);
// Step 2
if self.show_poster.get() {
self.show_poster.set(false);
self.time_marches_on();
}
// Step 3
task_source.queue_simple_event(self.upcast(), atom!("play"), &window);
// Step 4
self.notify_about_playing();
// Step 5
self.autoplaying.set(false);
}
// FIXME(nox): According to the spec, this should come *before* the
// "play" event.
task_source.queue_simple_event(self.upcast(), atom!("canplaythrough"), &window);
}
}
// https://html.spec.whatwg.org/multipage/#concept-media-load-algorithm
fn invoke_resource_selection_algorithm(&self) {
// Step 1.
self.network_state.set(NetworkState::NoSource);
// Step 2.
self.show_poster.set(true);
// Step 3.
self.delay_load_event(true);
// Step 4.
// If the resource selection mode in the synchronous section is
// "attribute", the URL of the resource to fetch is relative to the
// media element's node document when the src attribute was last
// changed, which is why we need to pass the base URL in the task
// right here.
let doc = document_from_node(self);
let task = MediaElementMicrotask::ResourceSelectionTask {
elem: DomRoot::from_ref(self),
generation_id: self.generation_id.get(),
base_url: doc.base_url(),
};
// FIXME(nox): This will later call the resource_selection_algorithm_sync
// method from below, if microtasks were trait objects, we would be able
// to put the code directly in this method, without the boilerplate
// indirections.
ScriptThread::await_stable_state(Microtask::MediaElement(task));
}
// https://html.spec.whatwg.org/multipage/#concept-media-load-algorithm
fn resource_selection_algorithm_sync(&self, base_url: ServoUrl) {
// Step 5.
// FIXME(ferjm): Implement blocked_on_parser logic
// https://html.spec.whatwg.org/multipage/#blocked-on-parser
// FIXME(nox): Maybe populate the list of pending text tracks.
// Step 6.
enum Mode {
Object,
Attribute(String),
Children(DomRoot<HTMLSourceElement>),
}
fn mode(media: &HTMLMediaElement) -> Option<Mode> {
if media.src_object.borrow().is_some() {
return Some(Mode::Object);
}
if let Some(attr) = media
.upcast::<Element>()
.get_attribute(&ns!(), &local_name!("src"))
{
return Some(Mode::Attribute(attr.Value().into()));
}
let source_child_element = media
.upcast::<Node>()
.children()
.filter_map(DomRoot::downcast::<HTMLSourceElement>)
.next();
if let Some(element) = source_child_element {
return Some(Mode::Children(element));
}
None
}
let mode = if let Some(mode) = mode(self) {
mode
} else {
self.network_state.set(NetworkState::Empty);
// https://github.com/whatwg/html/issues/3065
self.delay_load_event(false);
return;
};
// Step 7.
self.network_state.set(NetworkState::Loading);
// Step 8.
let window = window_from_node(self);
window
.task_manager()
.media_element_task_source()
.queue_simple_event(self.upcast(), atom!("loadstart"), &window);
// Step 9.
match mode {
// Step 9.obj.
Mode::Object => {
// Step 9.obj.1.
*self.current_src.borrow_mut() = "".to_owned();
// Step 9.obj.2.
// FIXME(nox): The rest of the steps should be ran in parallel.
// Step 9.obj.3.
// Note that the resource fetch algorithm itself takes care
// of the cleanup in case of failure itself.
self.resource_fetch_algorithm(Resource::Object);
},
Mode::Attribute(src) => {
// Step 9.attr.1.
if src.is_empty() {
self.queue_dedicated_media_source_failure_steps();
return;
}
// Step 9.attr.2.
let url_record = match base_url.join(&src) {
Ok(url) => url,
Err(_) => {
self.queue_dedicated_media_source_failure_steps();
return;
},
};
// Step 9.attr.3.
*self.current_src.borrow_mut() = url_record.as_str().into();
// Step 9.attr.4.
// Note that the resource fetch algorithm itself takes care
// of the cleanup in case of failure itself.
self.resource_fetch_algorithm(Resource::Url(url_record));
},
// Step 9.children.
Mode::Children(source) => {
// This is only a partial implementation
// FIXME: https://github.com/servo/servo/issues/21481
let src = source.Src();
// Step 9.attr.2.
if src.is_empty() {
source.upcast::<EventTarget>().fire_event(atom!("error"));
self.queue_dedicated_media_source_failure_steps();
return;
}
// Step 9.attr.3.
let url_record = match base_url.join(&src) {
Ok(url) => url,
Err(_) => {
source.upcast::<EventTarget>().fire_event(atom!("error"));
self.queue_dedicated_media_source_failure_steps();
return;
},
};
// Step 9.attr.8.
self.resource_fetch_algorithm(Resource::Url(url_record));
},
}
}
fn fetch_request(&self, offset: Option<u64>) {
if self.resource_url.borrow().is_none() && self.blob_url.borrow().is_none() {
eprintln!("Missing request url");
self.queue_dedicated_media_source_failure_steps();
return;
}
// FIXME(nox): Handle CORS setting from crossorigin attribute.
let document = document_from_node(self);
let destination = match self.media_type_id() {
HTMLMediaElementTypeId::HTMLAudioElement => Destination::Audio,
HTMLMediaElementTypeId::HTMLVideoElement => Destination::Video,
};
let mut headers = HeaderMap::new();
// FIXME(eijebong): Use typed headers once we have a constructor for the range header
headers.insert(
header::RANGE,
HeaderValue::from_str(&format!("bytes={}-", offset.unwrap_or(0))).unwrap(),
);
let url = match self.resource_url.borrow().as_ref() {
Some(url) => url.clone(),
None => self.blob_url.borrow().as_ref().unwrap().clone(),
};
let request = RequestBuilder::new(url.clone())
.headers(headers)
.destination(destination)
.credentials_mode(CredentialsMode::Include)
.use_url_credentials(true)
.origin(document.origin().immutable().clone())
.pipeline_id(Some(self.global().pipeline_id()))
.referrer_url(Some(document.url()))
.referrer_policy(document.get_referrer_policy());
let mut current_fetch_context = self.current_fetch_context.borrow_mut();
if let Some(ref mut current_fetch_context) = *current_fetch_context {
current_fetch_context.cancel(CancelReason::Overridden);
}
let (fetch_context, cancel_receiver) = HTMLMediaElementFetchContext::new();
*current_fetch_context = Some(fetch_context);
let fetch_listener = Arc::new(Mutex::new(HTMLMediaElementFetchListener::new(
self,
url.clone(),
offset.unwrap_or(0),
)));
let (action_sender, action_receiver) = ipc::channel().unwrap();
let window = window_from_node(self);
let (task_source, canceller) = window
.task_manager()
.networking_task_source_with_canceller();
let network_listener = NetworkListener {
context: fetch_listener,
task_source,
canceller: Some(canceller),
};
ROUTER.add_route(
action_receiver.to_opaque(),
Box::new(move |message| {
network_listener.notify_fetch(message.to().unwrap());
}),
);
let global = self.global();
global
.core_resource_thread()
.send(CoreResourceMsg::Fetch(
request,
FetchChannels::ResponseMsg(action_sender, Some(cancel_receiver)),
))
.unwrap();
}
// https://html.spec.whatwg.org/multipage/#concept-media-load-resource
fn resource_fetch_algorithm(&self, resource: Resource) {
if let Err(e) = self.setup_media_player(&resource) {
eprintln!("Setup media player error {:?}", e);
self.queue_dedicated_media_source_failure_steps();
return;
}
// Steps 1-2.
// Unapplicable, the `resource` variable already conveys which mode
// is in use.
// Step 3.
// FIXME(nox): Remove all media-resource-specific text tracks.
// Step 4.
match resource {
Resource::Url(url) => {
// Step 4.remote.1.
if self.Preload() == "none" && !self.autoplaying.get() {
// Step 4.remote.1.1.
self.network_state.set(NetworkState::Idle);
// Step 4.remote.1.2.
let window = window_from_node(self);
window
.task_manager()
.media_element_task_source()
.queue_simple_event(self.upcast(), atom!("suspend"), &window);
// Step 4.remote.1.3.
let this = Trusted::new(self);
window
.task_manager()
.media_element_task_source()
.queue(
task!(set_media_delay_load_event_flag_to_false: move || {
this.root().delay_load_event(false);
}),
window.upcast(),
)
.unwrap();
// Steps 4.remote.1.4.
// FIXME(nox): Somehow we should wait for the task from previous
// step to be ran before continuing.
// Steps 4.remote.1.5-4.remote.1.7.
// FIXME(nox): Wait for an implementation-defined event and
// then continue with the normal set of steps instead of just
// returning.
return;
}
// Step 4.remote.2.
*self.resource_url.borrow_mut() = Some(url);
self.fetch_request(None);
},
Resource::Object => {
if let Some(ref src_object) = *self.src_object.borrow() {
match src_object {
SrcObject::Blob(blob) => {
let blob_url = URL::CreateObjectURL(&self.global(), &*blob);
*self.blob_url.borrow_mut() =
Some(ServoUrl::parse(&blob_url).expect("infallible"));
self.fetch_request(None);
},
SrcObject::MediaStream(ref stream) => {
for stream in stream.get_tracks() {
if let Err(_) =
self.player.borrow().as_ref().unwrap().set_stream(&stream)
{
self.queue_dedicated_media_source_failure_steps();
}
}
},
}
}
},
}
}
/// Queues a task to run the [dedicated media source failure steps][steps].
///
/// [steps]: https://html.spec.whatwg.org/multipage/#dedicated-media-source-failure-steps
fn queue_dedicated_media_source_failure_steps(&self) {
let window = window_from_node(self);
let this = Trusted::new(self);
let generation_id = self.generation_id.get();
self.take_pending_play_promises(Err(Error::NotSupported));
// FIXME(nox): Why are errors silenced here?
let _ = window.task_manager().media_element_task_source().queue(
task!(dedicated_media_source_failure_steps: move || {
let this = this.root();
if generation_id != this.generation_id.get() {
return;
}
this.fulfill_in_flight_play_promises(|| {
// Step 1.
this.error.set(Some(&*MediaError::new(
&window_from_node(&*this),
MEDIA_ERR_SRC_NOT_SUPPORTED,
)));
// Step 2.
this.AudioTracks().clear();
this.VideoTracks().clear();
// Step 3.
this.network_state.set(NetworkState::NoSource);
// Step 4.
this.show_poster.set(true);
// Step 5.
this.upcast::<EventTarget>().fire_event(atom!("error"));
if let Some(ref player) = *this.player.borrow() {
if let Err(e) = player.stop() {
eprintln!("Could not stop player {:?}", e);
}
}
// Step 6.
// Done after running this closure in
// `fulfill_in_flight_play_promises`.
});
// Step 7.
this.delay_load_event(false);
}),
window.upcast(),
);
}
fn queue_ratechange_event(&self) {
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
task_source.queue_simple_event(self.upcast(), atom!("ratechange"), &window);
}
// https://html.spec.whatwg.org/multipage/#potentially-playing
fn is_potentially_playing(&self) -> bool {
!self.paused.get() &&
// FIXME: We need https://github.com/servo/servo/pull/22348
// to know whether playback has ended or not
// !self.Ended() &&
self.error.get().is_none() &&
!self.is_blocked_media_element()
}
// https://html.spec.whatwg.org/multipage/#blocked-media-element
fn is_blocked_media_element(&self) -> bool {
self.ready_state.get() <= ReadyState::HaveCurrentData ||
self.is_paused_for_user_interaction() ||
self.is_paused_for_in_band_content()
}
// https://html.spec.whatwg.org/multipage/#paused-for-user-interaction
fn is_paused_for_user_interaction(&self) -> bool {
// FIXME: we will likely be able to fill this placeholder once (if) we
// implement the MediaSession API.
false
}
// https://html.spec.whatwg.org/multipage/#paused-for-in-band-content
fn is_paused_for_in_band_content(&self) -> bool {
// FIXME: we will likely be able to fill this placeholder once (if) we
// implement https://github.com/servo/servo/issues/22314
false
}
// https://html.spec.whatwg.org/multipage/#media-element-load-algorithm
fn media_element_load_algorithm(&self) {
// Reset the flag that signals whether loadeddata was ever fired for
// this invokation of the load algorithm.
self.fired_loadeddata_event.set(false);
// Step 1-2.
self.generation_id.set(self.generation_id.get() + 1);
// Steps 3-4.
while !self.in_flight_play_promises_queue.borrow().is_empty() {
self.fulfill_in_flight_play_promises(|| ());
}
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
// Step 5.
let network_state = self.network_state.get();
if network_state == NetworkState::Loading || network_state == NetworkState::Idle {
task_source.queue_simple_event(self.upcast(), atom!("abort"), &window);
}
// Step 6.
if network_state != NetworkState::Empty {
// Step 6.1.
task_source.queue_simple_event(self.upcast(), atom!("emptied"), &window);
// Step 6.2.
if let Some(ref mut current_fetch_context) = *self.current_fetch_context.borrow_mut() {
current_fetch_context.cancel(CancelReason::Error);
}
// Step 6.3.
// FIXME(nox): Detach MediaSource media provider object.
// Step 6.4.
self.AudioTracks().clear();
self.VideoTracks().clear();
// Step 6.5.
if self.ready_state.get() != ReadyState::HaveNothing {
self.change_ready_state(ReadyState::HaveNothing);
}
// Step 6.6.
if !self.Paused() {
// Step 6.6.1.
self.paused.set(true);
// Step 6.6.2.
self.take_pending_play_promises(Err(Error::Abort));
self.fulfill_in_flight_play_promises(|| ());
}
// Step 6.7.
if !self.seeking.get() {
self.seeking.set(false);
}
// Step 6.8.
let queue_timeupdate_event = self.playback_position.get() != 0.;
self.playback_position.set(0.);
if queue_timeupdate_event {
task_source.queue_simple_event(self.upcast(), atom!("timeupdate"), &window);
}
// Step 6.9.
// FIXME(nox): Set timeline offset to NaN.
// Step 6.10.
self.duration.set(f64::NAN);
}
// Step 7.
self.playbackRate.set(self.defaultPlaybackRate.get());
// Step 8.
self.error.set(None);
self.autoplaying.set(true);
// Step 9.
self.invoke_resource_selection_algorithm();
// Step 10.
// FIXME(nox): Stop playback of any previously running media resource.
}
/// Appends a promise to the list of pending play promises.
fn push_pending_play_promise(&self, promise: &Rc<Promise>) {
self.pending_play_promises
.borrow_mut()
.push(promise.clone());
}
/// Takes the pending play promises.
///
/// The result with which these promises will be fulfilled is passed here
/// and this method returns nothing because we actually just move the
/// current list of pending play promises to the
/// `in_flight_play_promises_queue` field.
///
/// Each call to this method must be followed by a call to
/// `fulfill_in_flight_play_promises`, to actually fulfill the promises
/// which were taken and moved to the in-flight queue.
fn take_pending_play_promises(&self, result: ErrorResult) {
let pending_play_promises =
mem::replace(&mut *self.pending_play_promises.borrow_mut(), vec![]);
self.in_flight_play_promises_queue
.borrow_mut()
.push_back((pending_play_promises.into(), result));
}
/// Fulfills the next in-flight play promises queue after running a closure.
///
/// See the comment on `take_pending_play_promises` for why this method
/// does not take a list of promises to fulfill. Callers cannot just pop
/// the front list off of `in_flight_play_promises_queue` and later fulfill
/// the promises because that would mean putting
/// `#[allow(unrooted_must_root)]` on even more functions, potentially
/// hiding actual safety bugs.
#[allow(unrooted_must_root)]
fn fulfill_in_flight_play_promises<F>(&self, f: F)
where
F: FnOnce(),
{
let (promises, result) = self
.in_flight_play_promises_queue
.borrow_mut()
.pop_front()
.expect("there should be at least one list of in flight play promises");
f();
for promise in &*promises {
match result {
Ok(ref value) => promise.resolve_native(value),
Err(ref error) => promise.reject_error(error.clone()),
}
}
}
/// Handles insertion of `source` children.
///
/// <https://html.spec.whatwg.org/multipage/#the-source-element:nodes-are-inserted>
pub fn handle_source_child_insertion(&self) {
if self.upcast::<Element>().has_attribute(&local_name!("src")) {
return;
}
if self.network_state.get() != NetworkState::Empty {
return;
}
self.media_element_load_algorithm();
}
// https://html.spec.whatwg.org/multipage/#dom-media-seek
fn seek(&self, time: f64, _approximate_for_speed: bool) {
// Step 1.
self.show_poster.set(false);
// Step 2.
if self.ready_state.get() == ReadyState::HaveNothing {
return;
}
// Step 3.
// The fetch request associated with this seek already takes
// care of cancelling any previous requests.
// Step 4.
// The flag will be cleared when the media engine tells us the seek was done.
self.seeking.set(true);
// Step 5.
// XXX(ferjm) The rest of the steps should be run in parallel, so seeking cancelation
// can be done properly. No other browser does it yet anyway.
// Step 6.
let time = f64::min(time, self.Duration());
// Step 7.
let time = f64::max(time, 0.);
// Step 8.
// XXX(ferjm) seekable attribute: we need to get the information about
// what's been decoded and buffered so far from servo-media
// and add the seekable attribute as a TimeRange.
if let Some(ref current_fetch_context) = *self.current_fetch_context.borrow() {
if !current_fetch_context.is_seekable() {
self.seeking.set(false);
return;
}
}
// Step 9.
// servo-media with gstreamer does not support inaccurate seeking for now.
// Step 10.
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
task_source.queue_simple_event(self.upcast(), atom!("seeking"), &window);
// Step 11.
if let Some(ref player) = *self.player.borrow() {
if let Err(e) = player.seek(time) {
eprintln!("Seek error {:?}", e);
}
}
// The rest of the steps are handled when the media engine signals a
// ready state change or otherwise satisfies seek completion and signals
// a position change.
}
// https://html.spec.whatwg.org/multipage/#dom-media-seek
fn seek_end(&self) {
// Step 14.
self.seeking.set(false);
// Step 15.
self.time_marches_on();
// Step 16.
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
task_source.queue_simple_event(self.upcast(), atom!("timeupdate"), &window);
// Step 17.
task_source.queue_simple_event(self.upcast(), atom!("seeked"), &window);
}
/// https://html.spec.whatwg.org/multipage/#poster-frame
pub fn process_poster_response(&self, image: ImageResponse) {
if !self.show_poster.get() {
return;
}
// Step 6.
if let ImageResponse::Loaded(image, _) = image {
self.frame_renderer
.lock()
.unwrap()
.render_poster_frame(image);
self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
if pref!(media.testing.enabled) {
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
task_source.queue_simple_event(self.upcast(), atom!("postershown"), &window);
} else {
return;
}
}
}
fn setup_media_player(&self, resource: &Resource) -> Result<(), ()> {
let stream_type = match *resource {
Resource::Object => {
if let Some(ref src_object) = *self.src_object.borrow() {
match src_object {
SrcObject::MediaStream(_) => StreamType::Stream,
_ => StreamType::Seekable,
}
} else {
return Err(());
}
},
_ => StreamType::Seekable,
};
let player = ServoMedia::get().unwrap().create_player(stream_type);
let (action_sender, action_receiver) = ipc::channel().unwrap();
player.register_event_handler(action_sender);
player.register_frame_renderer(self.frame_renderer.clone());
*self.player.borrow_mut() = Some(player);
let trusted_node = Trusted::new(self);
let window = window_from_node(self);
let (task_source, canceller) = window
.task_manager()
.dom_manipulation_task_source_with_canceller();
ROUTER.add_route(
action_receiver.to_opaque(),
Box::new(move |message| {
let event: PlayerEvent = message.to().unwrap();
trace!("Player event {:?}", event);
let this = trusted_node.clone();
if let Err(err) = task_source.queue_with_canceller(
task!(handle_player_event: move || {
this.root().handle_player_event(&event);
}),
&canceller,
) {
warn!("Could not queue player event handler task {:?}", err);
}
}),
);
Ok(())
}
fn handle_player_event(&self, event: &PlayerEvent) {
match *event {
PlayerEvent::EndOfStream => {
// https://html.spec.whatwg.org/multipage/#media-data-processing-steps-list
// => "If the media data can be fetched but is found by inspection to be in
// an unsupported format, or can otherwise not be rendered at all"
if self.ready_state.get() < ReadyState::HaveMetadata {
self.queue_dedicated_media_source_failure_steps();
} else {
// https://html.spec.whatwg.org/multipage/#reaches-the-end
match self.direction_of_playback() {
PlaybackDirection::Forwards => {
// Step 1.
if self.Loop() {
self.seek(
self.earliest_possible_position(),
/* approximate_for_speed*/ false,
);
} else {
// Step 2.
// The **ended playback** condition is implemented inside of
// the HTMLMediaElementMethods::Ended method
// Step 3.
let window = window_from_node(self);
let this = Trusted::new(self);
let _ = window.task_manager().media_element_task_source().queue(
task!(reaches_the_end_steps: move || {
let this = this.root();
// Step 3.1.
this.upcast::<EventTarget>().fire_event(atom!("timeupdate"));
// Step 3.2.
if this.Ended() && !this.Paused() {
// Step 3.2.1.
this.paused.set(true);
// Step 3.2.2.
this.upcast::<EventTarget>().fire_event(atom!("pause"));
// Step 3.2.3.
this.take_pending_play_promises(Err(Error::Abort));
this.fulfill_in_flight_play_promises(|| ());
}
// Step 3.3.
this.upcast::<EventTarget>().fire_event(atom!("ended"));
}),
window.upcast(),
);
}
},
PlaybackDirection::Backwards => {
if self.playback_position.get() <= self.earliest_possible_position() {
let window = window_from_node(self);
window
.task_manager()
.media_element_task_source()
.queue_simple_event(self.upcast(), atom!("ended"), &window);
}
},
}
}
},
PlayerEvent::Error => {
self.error.set(Some(&*MediaError::new(
&*window_from_node(self),
MEDIA_ERR_DECODE,
)));
self.upcast::<EventTarget>().fire_event(atom!("error"));
},
PlayerEvent::FrameUpdated => {
self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
},
PlayerEvent::MetadataUpdated(ref metadata) => {
// https://html.spec.whatwg.org/multipage/#media-data-processing-steps-list
// => If the media resource is found to have an audio track
if !metadata.audio_tracks.is_empty() {
for (i, _track) in metadata.audio_tracks.iter().enumerate() {
// Step 1.
let kind = match i {
0 => DOMString::from("main"),
_ => DOMString::new(),
};
let window = window_from_node(self);
let audio_track = AudioTrack::new(
&window,
DOMString::new(),
kind,
DOMString::new(),
DOMString::new(),
);
// Steps 2. & 3.
self.AudioTracks().add(&audio_track);
// Step 4
// https://www.w3.org/TR/media-frags/#media-fragment-syntax
// https://github.com/servo/servo/issues/22366
// Step 5. & 6,
if self.AudioTracks().enabled_index().is_none() {
self.AudioTracks()
.set_enabled(self.AudioTracks().len() - 1, true);
}
// Steps 7.
let event = TrackEvent::new(
&self.global(),
atom!("addtrack"),
false,
false,
&Some(VideoTrackOrAudioTrackOrTextTrack::AudioTrack(audio_track)),
);
event.upcast::<Event>().fire(self.upcast::<EventTarget>());
}
}
// => If the media resource is found to have a video track
if !metadata.video_tracks.is_empty() {
for (i, _track) in metadata.video_tracks.iter().enumerate() {
// Step 1.
let kind = match i {
0 => DOMString::from("main"),
_ => DOMString::new(),
};
let window = window_from_node(self);
let video_track = VideoTrack::new(
&window,
DOMString::new(),
kind,
DOMString::new(),
DOMString::new(),
);
// Steps 2. & 3.
self.VideoTracks().add(&video_track);
// Step 4.
// https://www.w3.org/TR/media-frags/#media-fragment-syntax
// https://github.com/servo/servo/issues/22366
// Step 5. & 6.
if self.VideoTracks().selected_index().is_none() {
self.VideoTracks()
.set_selected(self.VideoTracks().len() - 1, true);
}
// Steps 7.
let event = TrackEvent::new(
&self.global(),
atom!("addtrack"),
false,
false,
&Some(VideoTrackOrAudioTrackOrTextTrack::VideoTrack(video_track)),
);
event.upcast::<Event>().fire(self.upcast::<EventTarget>());
}
}
// => "Once enough of the media data has been fetched to determine the duration..."
// Step 1.
// servo-media owns the media timeline.
// Step 2.
// XXX(ferjm) Update the timeline offset.
// Step 3.
self.playback_position.set(0.);
// Step 4.
let previous_duration = self.duration.get();
if let Some(duration) = metadata.duration {
self.duration.set(duration.as_secs() as f64);
} else {
self.duration.set(f64::INFINITY);
}
if previous_duration != self.duration.get() {
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
task_source.queue_simple_event(self.upcast(), atom!("durationchange"), &window);
}
// Step 5.
if self.is::<HTMLVideoElement>() {
let video_elem = self.downcast::<HTMLVideoElement>().unwrap();
if video_elem.get_video_width() != metadata.width ||
video_elem.get_video_height() != metadata.height
{
video_elem.set_video_width(metadata.width);
video_elem.set_video_height(metadata.height);
let window = window_from_node(self);
let task_source = window.task_manager().media_element_task_source();
task_source.queue_simple_event(self.upcast(), atom!("resize"), &window);
}
}
// Step 6.
self.change_ready_state(ReadyState::HaveMetadata);
// Step 7.
let mut _jumped = false;
// Step 8.
if self.default_playback_start_position.get() > 0. {
self.seek(
self.default_playback_start_position.get(),
/* approximate_for_speed*/ false,
);
_jumped = true;
}
// Step 9.
self.default_playback_start_position.set(0.);
// Steps 10 and 11.
// XXX(ferjm) Implement parser for
// https://www.w3.org/TR/media-frags/#media-fragment-syntax
// https://github.com/servo/media/issues/156
// Step 12 & 13 are already handled by the earlier media track processing.
},
PlayerEvent::NeedData => {
// The player needs more data.
// If we already have a valid fetch request, we do nothing.
// Otherwise, if we have no request and the previous request was
// cancelled because we got an EnoughData event, we restart
// fetching where we left.
if let Some(ref current_fetch_context) = *self.current_fetch_context.borrow() {
match current_fetch_context.cancel_reason() {
Some(ref reason) if *reason == CancelReason::Backoff => {
// XXX(ferjm) Ideally we should just create a fetch request from
// where we left. But keeping track of the exact next byte that the
// media backend expects is not the easiest task, so I'm simply
// seeking to the current playback position for now which will create
// a new fetch request for the last rendered frame.
self.seek(self.playback_position.get(), false)
},
_ => (),
}
}
},
PlayerEvent::EnoughData => {
// The player has enough data and it is asking us to stop pushing
// bytes, so we cancel the ongoing fetch request iff we are able
// to restart it from where we left. Otherwise, we continue the
// current fetch request, assuming that some frames will be dropped.
if let Some(ref mut current_fetch_context) =
*self.current_fetch_context.borrow_mut()
{
if current_fetch_context.is_seekable() {
current_fetch_context.cancel(CancelReason::Backoff);
}
}
},
PlayerEvent::PositionChanged(position) => {
let position = position as f64;
let _ = self
.played
.borrow_mut()
.add(self.playback_position.get(), position);
self.playback_position.set(position);
self.time_marches_on();
},
PlayerEvent::SeekData(p) => {
self.fetch_request(Some(p));
},
PlayerEvent::SeekDone(_) => {
// Continuation of
// https://html.spec.whatwg.org/multipage/#dom-media-seek
// Step 13.
let task = MediaElementMicrotask::SeekedTask {
elem: DomRoot::from_ref(self),
generation_id: self.generation_id.get(),
};
ScriptThread::await_stable_state(Microtask::MediaElement(task));
},
PlayerEvent::StateChanged(ref state) => match *state {
PlaybackState::Paused => {
if self.ready_state.get() == ReadyState::HaveMetadata {
self.change_ready_state(ReadyState::HaveEnoughData);
}
},
_ => {},
},
}
}
// https://html.spec.whatwg.org/multipage/#earliest-possible-position
fn earliest_possible_position(&self) -> f64 {
self.played
.borrow()
.start(0)
.unwrap_or_else(|_| self.playback_position.get())
}
}
// XXX Placeholder for [https://github.com/servo/servo/issues/22293]
#[derive(Clone, Copy, JSTraceable, MallocSizeOf, PartialEq)]
enum PlaybackDirection {
Forwards,
#[allow(dead_code)]
Backwards,
}
// XXX Placeholder implementations for:
//
// - https://github.com/servo/servo/issues/22293
impl HTMLMediaElement {
// https://github.com/servo/servo/issues/22293
fn direction_of_playback(&self) -> PlaybackDirection {
PlaybackDirection::Forwards
}
}
impl Drop for HTMLMediaElement {
fn drop(&mut self) {
if let Some(ref player) = *self.player.borrow() {
if let Err(err) = player.shutdown() {
warn!("Error shutting down player {:?}", err);
}
}
}
}
impl HTMLMediaElementMethods for HTMLMediaElement {
// https://html.spec.whatwg.org/multipage/#dom-media-networkstate
fn NetworkState(&self) -> u16 {
self.network_state.get() as u16
}
// https://html.spec.whatwg.org/multipage/#dom-media-readystate
fn ReadyState(&self) -> u16 {
self.ready_state.get() as u16
}
// https://html.spec.whatwg.org/multipage/#dom-media-autoplay
make_bool_getter!(Autoplay, "autoplay");
// https://html.spec.whatwg.org/multipage/#dom-media-autoplay
make_bool_setter!(SetAutoplay, "autoplay");
// https://html.spec.whatwg.org/multipage/#attr-media-loop
make_bool_getter!(Loop, "loop");
// https://html.spec.whatwg.org/multipage/#attr-media-loop
make_bool_setter!(SetLoop, "loop");
// https://html.spec.whatwg.org/multipage/#dom-media-defaultmuted
make_bool_getter!(DefaultMuted, "muted");
// https://html.spec.whatwg.org/multipage/#dom-media-defaultmuted
make_bool_setter!(SetDefaultMuted, "muted");
// https://html.spec.whatwg.org/multipage/#dom-media-src
make_url_getter!(Src, "src");
// https://html.spec.whatwg.org/multipage/#dom-media-src
make_url_setter!(SetSrc, "src");
// https://html.spec.whatwg.org/multipage/#dom-media-muted
fn Muted(&self) -> bool {
self.muted.get()
}
// https://html.spec.whatwg.org/multipage/#dom-media-muted
fn SetMuted(&self, value: bool) {
if self.muted.get() == value {
return;
}
if let Some(ref player) = *self.player.borrow() {
let _ = player.set_mute(value);
}
self.muted.set(value);
let window = window_from_node(self);
window
.task_manager()
.media_element_task_source()
.queue_simple_event(self.upcast(), atom!("volumechange"), &window);
if !self.is_allowed_to_play() {
self.internal_pause_steps();
}
}
// https://html.spec.whatwg.org/multipage/#dom-media-srcobject
fn GetSrcObject(&self) -> Option<MediaStreamOrBlob> {
match *self.src_object.borrow() {
Some(ref src_object) => Some(match src_object {
SrcObject::Blob(blob) => MediaStreamOrBlob::Blob(DomRoot::from_ref(&*blob)),
SrcObject::MediaStream(stream) => {
MediaStreamOrBlob::MediaStream(DomRoot::from_ref(&*stream))
},
}),
None => None,
}
}
// https://html.spec.whatwg.org/multipage/#dom-media-srcobject
fn SetSrcObject(&self, value: Option<MediaStreamOrBlob>) {
*self.src_object.borrow_mut() = value.map(|value| value.into());
self.media_element_load_algorithm();
}
// https://html.spec.whatwg.org/multipage/#attr-media-preload
// Missing value default is user-agent defined.
make_enumerated_getter!(Preload, "preload", "", "none" | "metadata" | "auto");
// https://html.spec.whatwg.org/multipage/#attr-media-preload
make_setter!(SetPreload, "preload");
// https://html.spec.whatwg.org/multipage/#dom-media-currentsrc
fn CurrentSrc(&self) -> USVString {
USVString(self.current_src.borrow().clone())
}
// https://html.spec.whatwg.org/multipage/#dom-media-load
fn Load(&self) {
self.media_element_load_algorithm();
}
// https://html.spec.whatwg.org/multipage/#dom-navigator-canplaytype
fn CanPlayType(&self, type_: DOMString) -> CanPlayTypeResult {
match type_.parse::<Mime>() {
// XXX GStreamer is currently not very reliable playing OGG and most of
// the media related WPTs uses OGG if we report that we are able to
// play this type. So we report that we are unable to play it to force
// the usage of other types.
// https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/issues/520
Ok(ref mime)
if (mime.type_() == mime::APPLICATION && mime.subtype() == mime::OCTET_STREAM) ||
(mime.subtype() == mime::OGG) =>
{
CanPlayTypeResult::_empty
},
Err(_) => CanPlayTypeResult::_empty,
_ => CanPlayTypeResult::Maybe,
}
}
// https://html.spec.whatwg.org/multipage/#dom-media-error
fn GetError(&self) -> Option<DomRoot<MediaError>> {
self.error.get()
}
// https://html.spec.whatwg.org/multipage/#dom-media-play
#[allow(unsafe_code)]
fn Play(&self) -> Rc<Promise> {
let promise = unsafe { Promise::new_in_current_compartment(&self.global()) };
// Step 1.
// FIXME(nox): Reject promise if not allowed to play.
// Step 2.
if self
.error
.get()
.map_or(false, |e| e.Code() == MEDIA_ERR_SRC_NOT_SUPPORTED)
{
promise.reject_error(Error::NotSupported);
return promise;
}
// Step 3.
self.push_pending_play_promise(&promise);
// Step 4.
if self.network_state.get() == NetworkState::Empty {
self.invoke_resource_selection_algorithm();
}
// Step 5.
if self.Ended() && self.direction_of_playback() == PlaybackDirection::Forwards {
self.seek(
self.earliest_possible_position(),
/* approximate_for_speed */ false,
);
}
let state = self.ready_state.get();
let window = window_from_node(self);
// FIXME(nox): Why are errors silenced here?
let task_source = window.task_manager().media_element_task_source();
if self.Paused() {
// Step 6.1.
self.paused.set(false);
// Step 6.2.
if self.show_poster.get() {
self.show_poster.set(false);
self.time_marches_on();
}
// Step 6.3.
task_source.queue_simple_event(self.upcast(), atom!("play"), &window);
// Step 6.4.
match state {
ReadyState::HaveNothing |
ReadyState::HaveMetadata |
ReadyState::HaveCurrentData => {
task_source.queue_simple_event(self.upcast(), atom!("waiting"), &window);
},
ReadyState::HaveFutureData | ReadyState::HaveEnoughData => {
self.notify_about_playing();
},
}
} else if state == ReadyState::HaveFutureData || state == ReadyState::HaveEnoughData {
// Step 7.
self.take_pending_play_promises(Ok(()));
let this = Trusted::new(self);
let generation_id = self.generation_id.get();
task_source
.queue(
task!(resolve_pending_play_promises: move || {
let this = this.root();
if generation_id != this.generation_id.get() {
return;
}
this.fulfill_in_flight_play_promises(|| {
this.play_media();
});
}),
window.upcast(),
)
.unwrap();
}
// Step 8.
self.autoplaying.set(false);
// Step 9.
promise
}
// https://html.spec.whatwg.org/multipage/#dom-media-pause
fn Pause(&self) {
// Step 1
if self.network_state.get() == NetworkState::Empty {
self.invoke_resource_selection_algorithm();
}
// Step 2
self.internal_pause_steps();
}
// https://html.spec.whatwg.org/multipage/#dom-media-paused
fn Paused(&self) -> bool {
self.paused.get()
}
/// https://html.spec.whatwg.org/multipage/#dom-media-defaultplaybackrate
fn GetDefaultPlaybackRate(&self) -> Fallible<Finite<f64>> {
Ok(Finite::wrap(self.defaultPlaybackRate.get()))
}
/// https://html.spec.whatwg.org/multipage/#dom-media-defaultplaybackrate
fn SetDefaultPlaybackRate(&self, value: Finite<f64>) -> ErrorResult {
let min_allowed = -64.0;
let max_allowed = 64.0;
if *value < min_allowed || *value > max_allowed {
return Err(Error::NotSupported);
}
if *value != self.defaultPlaybackRate.get() {
self.defaultPlaybackRate.set(*value);
self.queue_ratechange_event();
}
Ok(())
}
/// https://html.spec.whatwg.org/multipage/#dom-media-playbackrate
fn GetPlaybackRate(&self) -> Fallible<Finite<f64>> {
Ok(Finite::wrap(self.playbackRate.get()))
}
/// https://html.spec.whatwg.org/multipage/#dom-media-playbackrate
fn SetPlaybackRate(&self, value: Finite<f64>) -> ErrorResult {
let min_allowed = -64.0;
let max_allowed = 64.0;
if *value < min_allowed || *value > max_allowed {
return Err(Error::NotSupported);
}
if *value != self.playbackRate.get() {
self.playbackRate.set(*value);
self.queue_ratechange_event();
if self.is_potentially_playing() {
if let Some(ref player) = *self.player.borrow() {
if let Err(e) = player.set_rate(*value) {
warn!("Could not set the playback rate {:?}", e);
}
}
}
}
Ok(())
}
// https://html.spec.whatwg.org/multipage/#dom-media-duration
fn Duration(&self) -> f64 {
self.duration.get()
}
// https://html.spec.whatwg.org/multipage/#dom-media-currenttime
fn CurrentTime(&self) -> Finite<f64> {
Finite::wrap(if self.default_playback_start_position.get() != 0. {
self.default_playback_start_position.get()
} else {
self.playback_position.get()
})
}
// https://html.spec.whatwg.org/multipage/#dom-media-currenttime
fn SetCurrentTime(&self, time: Finite<f64>) {
if self.ready_state.get() == ReadyState::HaveNothing {
self.default_playback_start_position.set(*time);
} else {
self.playback_position.set(*time);
self.seek(*time, /* approximate_for_speed */ false);
}
}
// https://html.spec.whatwg.org/multipage/#dom-media-seeking
fn Seeking(&self) -> bool {
self.seeking.get()
}
// https://html.spec.whatwg.org/multipage/#ended-playback
fn Ended(&self) -> bool {
if self.ready_state.get() < ReadyState::HaveMetadata {
return false;
}
let playback_pos = self.playback_position.get();
match self.direction_of_playback() {
PlaybackDirection::Forwards => playback_pos >= self.Duration() && !self.Loop(),
PlaybackDirection::Backwards => playback_pos <= self.earliest_possible_position(),
}
}
// https://html.spec.whatwg.org/multipage/#dom-media-fastseek
fn FastSeek(&self, time: Finite<f64>) {
self.seek(*time, /* approximate_for_speed */ true);
}
// https://html.spec.whatwg.org/multipage/#dom-media-played
fn Played(&self) -> DomRoot<TimeRanges> {
TimeRanges::new(self.global().as_window(), self.played.borrow().clone())
}
// https://html.spec.whatwg.org/multipage/#dom-media-buffered
fn Buffered(&self) -> DomRoot<TimeRanges> {
let mut buffered = TimeRangesContainer::new();
if let Some(ref player) = *self.player.borrow() {
if let Ok(ranges) = player.buffered() {
for range in ranges {
let _ = buffered.add(range.start as f64, range.end as f64);
}
}
}
TimeRanges::new(self.global().as_window(), buffered)
}
// https://html.spec.whatwg.org/multipage/#dom-media-audiotracks
fn AudioTracks(&self) -> DomRoot<AudioTrackList> {
let window = window_from_node(self);
self.audio_tracks_list
.or_init(|| AudioTrackList::new(&window, &[]))
}
// https://html.spec.whatwg.org/multipage/#dom-media-videotracks
fn VideoTracks(&self) -> DomRoot<VideoTrackList> {
let window = window_from_node(self);
self.video_tracks_list
.or_init(|| VideoTrackList::new(&window, &[]))
}
// https://html.spec.whatwg.org/multipage/#dom-media-texttracks
fn TextTracks(&self) -> DomRoot<TextTrackList> {
let window = window_from_node(self);
self.text_tracks_list
.or_init(|| TextTrackList::new(&window, &[]))
}
// https://html.spec.whatwg.org/multipage/#dom-media-addtexttrack
fn AddTextTrack(
&self,
kind: TextTrackKind,
label: DOMString,
language: DOMString,
) -> DomRoot<TextTrack> {
let window = window_from_node(self);
// Step 1 & 2
// FIXME(#22314, dlrobertson) set the ready state to Loaded
let track = TextTrack::new(
&window,
"".into(),
kind,
label,
language,
TextTrackMode::Hidden,
);
// Step 3 & 4
self.TextTracks().add(&track);
// Step 5
DomRoot::from_ref(&track)
}
// https://html.spec.whatwg.org/multipage/#dom-media-volume
fn GetVolume(&self) -> Fallible<Finite<f64>> {
Ok(Finite::wrap(self.volume.get()))
}
// https://html.spec.whatwg.org/multipage/#dom-media-volume
fn SetVolume(&self, value: Finite<f64>) -> ErrorResult {
let minimum_volume = 0.0;
let maximum_volume = 1.0;
if *value < minimum_volume || *value > maximum_volume {
return Err(Error::IndexSize);
}
if *value != self.volume.get() {
self.volume.set(*value);
let window = window_from_node(self);
window
.task_manager()
.media_element_task_source()
.queue_simple_event(self.upcast(), atom!("volumechange"), &window);
if !self.is_allowed_to_play() {
self.internal_pause_steps();
}
}
Ok(())
}
}
impl VirtualMethods for HTMLMediaElement {
fn super_type(&self) -> Option<&dyn VirtualMethods> {
Some(self.upcast::<HTMLElement>() as &dyn VirtualMethods)
}
fn attribute_mutated(&self, attr: &Attr, mutation: AttributeMutation) {
self.super_type().unwrap().attribute_mutated(attr, mutation);
if &local_name!("muted") == attr.local_name() {
self.SetMuted(mutation.new_value(attr).is_some());
return;
}
if mutation.new_value(attr).is_none() {
return;
}
match attr.local_name() {
&local_name!("src") => {
self.media_element_load_algorithm();
},
_ => (),
};
}
// https://html.spec.whatwg.org/multipage/#playing-the-media-resource:remove-an-element-from-a-document
fn unbind_from_tree(&self, context: &UnbindContext) {
self.super_type().unwrap().unbind_from_tree(context);
if context.tree_in_doc {
let task = MediaElementMicrotask::PauseIfNotInDocumentTask {
elem: DomRoot::from_ref(self),
};
ScriptThread::await_stable_state(Microtask::MediaElement(task));
}
}
}
pub trait LayoutHTMLMediaElementHelpers {
fn data(&self) -> HTMLMediaData;
}
impl LayoutHTMLMediaElementHelpers for LayoutDom<HTMLMediaElement> {
#[allow(unsafe_code)]
fn data(&self) -> HTMLMediaData {
let media = unsafe { &*self.unsafe_get() };
HTMLMediaData {
current_frame: media.frame_renderer.lock().unwrap().current_frame.clone(),
}
}
}
#[derive(JSTraceable, MallocSizeOf)]
pub enum MediaElementMicrotask {
ResourceSelectionTask {
elem: DomRoot<HTMLMediaElement>,
generation_id: u32,
base_url: ServoUrl,
},
PauseIfNotInDocumentTask {
elem: DomRoot<HTMLMediaElement>,
},
SeekedTask {
elem: DomRoot<HTMLMediaElement>,
generation_id: u32,
},
}
impl MicrotaskRunnable for MediaElementMicrotask {
fn handler(&self) {
match self {
&MediaElementMicrotask::ResourceSelectionTask {
ref elem,
generation_id,
ref base_url,
} => {
if generation_id == elem.generation_id.get() {
elem.resource_selection_algorithm_sync(base_url.clone());
}
},
&MediaElementMicrotask::PauseIfNotInDocumentTask { ref elem } => {
if !elem.upcast::<Node>().is_in_doc() {
elem.internal_pause_steps();
}
},
&MediaElementMicrotask::SeekedTask {
ref elem,
generation_id,
} => {
if generation_id == elem.generation_id.get() {
elem.seek_end();
}
},
}
}
}
enum Resource {
Object,
Url(ServoUrl),
}
/// Indicates the reason why a fetch request was cancelled.
#[derive(Debug, MallocSizeOf, PartialEq)]
enum CancelReason {
/// We were asked to stop pushing data to the player.
Backoff,
/// An error ocurred while fetching the media data.
Error,
/// A new request overrode this one.
Overridden,
}
#[derive(MallocSizeOf)]
pub struct HTMLMediaElementFetchContext {
/// Some if the request has been cancelled.
cancel_reason: Option<CancelReason>,
/// Indicates whether the fetched stream is seekable.
is_seekable: bool,
/// Fetch canceller. Allows cancelling the current fetch request by
/// manually calling its .cancel() method or automatically on Drop.
fetch_canceller: FetchCanceller,
}
impl HTMLMediaElementFetchContext {
fn new() -> (HTMLMediaElementFetchContext, ipc::IpcReceiver<()>) {
let mut fetch_canceller = FetchCanceller::new();
let cancel_receiver = fetch_canceller.initialize();
(
HTMLMediaElementFetchContext {
cancel_reason: None,
is_seekable: false,
fetch_canceller,
},
cancel_receiver,
)
}
fn is_seekable(&self) -> bool {
self.is_seekable
}
fn set_seekable(&mut self, seekable: bool) {
self.is_seekable = seekable;
}
fn cancel(&mut self, reason: CancelReason) {
if self.cancel_reason.is_some() {
return;
}
self.cancel_reason = Some(reason);
self.fetch_canceller.cancel();
}
fn cancel_reason(&self) -> &Option<CancelReason> {
&self.cancel_reason
}
}
struct HTMLMediaElementFetchListener {
/// The element that initiated the request.
elem: Trusted<HTMLMediaElement>,
/// The response metadata received to date.
metadata: Option<Metadata>,
/// The generation of the media element when this fetch started.
generation_id: u32,
/// Time of last progress notification.
next_progress_event: Timespec,
/// Timing data for this resource.
resource_timing: ResourceFetchTiming,
/// Url for the resource.
url: ServoUrl,
/// Expected content length of the media asset being fetched or played.
expected_content_length: Option<u64>,
/// Number of the last byte fetched from the network for the ongoing
/// request. It is only reset to 0 if we reach EOS. Seek requests
/// set it to the requested position. Requests triggered after an
/// EnoughData event uses this value to restart the download from
/// the last fetched position.
latest_fetched_content: u64,
}
// https://html.spec.whatwg.org/multipage/#media-data-processing-steps-list
impl FetchResponseListener for HTMLMediaElementFetchListener {
fn process_request_body(&mut self) {}
fn process_request_eof(&mut self) {}
fn process_response(&mut self, metadata: Result<FetchMetadata, NetworkError>) {
let elem = self.elem.root();
if elem.generation_id.get() != self.generation_id || elem.player.borrow().is_none() {
// A new fetch request was triggered, so we ignore this response.
return;
}
self.metadata = metadata.ok().map(|m| match m {
FetchMetadata::Unfiltered(m) => m,
FetchMetadata::Filtered { unsafe_, .. } => unsafe_,
});
if let Some(metadata) = self.metadata.as_ref() {
if let Some(headers) = metadata.headers.as_ref() {
// For range requests we get the size of the media asset from the Content-Range
// header. Otherwise, we get it from the Content-Length header.
let content_length =
if let Some(content_range) = headers.typed_get::<ContentRange>() {
content_range.bytes_len()
} else if let Some(content_length) = headers.typed_get::<ContentLength>() {
Some(content_length.0)
} else {
None
};
// We only set the expected input size if it changes.
if content_length != self.expected_content_length {
if let Some(content_length) = content_length {
if let Err(e) = elem
.player
.borrow()
.as_ref()
.unwrap()
.set_input_size(content_length)
{
warn!("Could not set player input size {:?}", e);
} else {
self.expected_content_length = Some(content_length);
}
}
}
}
}
let (status_is_ok, is_seekable) = self
.metadata
.as_ref()
.and_then(|m| m.status.as_ref())
.map_or((true, false), |s| {
(s.0 >= 200 && s.0 < 300, s.0 == 206 || s.0 == 416)
});
if is_seekable {
// The server supports range requests,
if let Some(ref mut current_fetch_context) = *elem.current_fetch_context.borrow_mut() {
current_fetch_context.set_seekable(true);
}
}
// => "If the media data cannot be fetched at all..."
if !status_is_ok {
// Ensure that the element doesn't receive any further notifications
// of the aborted fetch.
if let Some(ref mut current_fetch_context) = *elem.current_fetch_context.borrow_mut() {
current_fetch_context.cancel(CancelReason::Error);
}
elem.queue_dedicated_media_source_failure_steps();
}
}
fn process_response_chunk(&mut self, payload: Vec<u8>) {
let elem = self.elem.root();
// If an error was received previously or if we triggered a new fetch request,
// we skip processing the payload.
if elem.generation_id.get() != self.generation_id || elem.player.borrow().is_none() {
return;
}
if let Some(ref current_fetch_context) = *elem.current_fetch_context.borrow() {
if current_fetch_context.cancel_reason().is_some() {
return;
}
}
let payload_len = payload.len() as u64;
// Push input data into the player.
if let Err(e) = elem.player.borrow().as_ref().unwrap().push_data(payload) {
// If we are pushing too much data and we know that we can
// restart the download later from where we left, we cancel
// the current request. Otherwise, we continue the request
// assuming that we may drop some frames.
match e {
PlayerError::EnoughData => {
if let Some(ref mut current_fetch_context) =
*elem.current_fetch_context.borrow_mut()
{
current_fetch_context.cancel(CancelReason::Backoff);
}
},
_ => (),
}
warn!("Could not push input data to player {:?}", e);
return;
}
self.latest_fetched_content += payload_len;
// https://html.spec.whatwg.org/multipage/#concept-media-load-resource step 4,
// => "If mode is remote" step 2
if time::get_time() > self.next_progress_event {
let window = window_from_node(&*elem);
window
.task_manager()
.media_element_task_source()
.queue_simple_event(elem.upcast(), atom!("progress"), &window);
self.next_progress_event = time::get_time() + Duration::milliseconds(350);
}
}
// https://html.spec.whatwg.org/multipage/#media-data-processing-steps-list
fn process_response_eof(&mut self, status: Result<ResourceFetchTiming, NetworkError>) {
let elem = self.elem.root();
if elem.player.borrow().is_none() {
return;
}
// If an error was previously received and no new fetch request was triggered,
// we skip processing the payload and notify the media backend that we are done
// pushing data.
if elem.generation_id.get() == self.generation_id {
if let Some(ref current_fetch_context) = *elem.current_fetch_context.borrow() {
if let Some(CancelReason::Error) = current_fetch_context.cancel_reason() {
if let Err(e) = elem.player.borrow().as_ref().unwrap().end_of_stream() {
warn!("Could not signal EOS to player {:?}", e);
}
return;
}
}
}
if status.is_ok() && self.latest_fetched_content != 0 {
if elem.ready_state.get() == ReadyState::HaveNothing {
// Make sure that we don't skip the HaveMetadata and HaveCurrentData
// states for short streams.
elem.change_ready_state(ReadyState::HaveMetadata);
}
elem.change_ready_state(ReadyState::HaveEnoughData);
elem.upcast::<EventTarget>().fire_event(atom!("progress"));
elem.network_state.set(NetworkState::Idle);
elem.upcast::<EventTarget>().fire_event(atom!("suspend"));
elem.delay_load_event(false);
}
// => "If the connection is interrupted after some media data has been received..."
else if elem.ready_state.get() != ReadyState::HaveNothing {
// Step 1
if let Some(ref mut current_fetch_context) = *elem.current_fetch_context.borrow_mut() {
current_fetch_context.cancel(CancelReason::Error);
}
// Step 2
elem.error.set(Some(&*MediaError::new(
&*window_from_node(&*elem),
MEDIA_ERR_NETWORK,
)));
// Step 3
elem.network_state.set(NetworkState::Idle);
// Step 4.
elem.delay_load_event(false);
// Step 5
elem.upcast::<EventTarget>().fire_event(atom!("error"));
} else {
// => "If the media data cannot be fetched at all..."
elem.queue_dedicated_media_source_failure_steps();
}
}
fn resource_timing_mut(&mut self) -> &mut ResourceFetchTiming {
&mut self.resource_timing
}
fn resource_timing(&self) -> &ResourceFetchTiming {
&self.resource_timing
}
fn submit_resource_timing(&mut self) {
network_listener::submit_timing(self)
}
}
impl ResourceTimingListener for HTMLMediaElementFetchListener {
fn resource_timing_information(&self) -> (InitiatorType, ServoUrl) {
let initiator_type = InitiatorType::LocalName(
self.elem
.root()
.upcast::<Element>()
.local_name()
.to_string(),
);
(initiator_type, self.url.clone())
}
fn resource_timing_global(&self) -> DomRoot<GlobalScope> {
(document_from_node(&*self.elem.root()).global())
}
}
impl PreInvoke for HTMLMediaElementFetchListener {
fn should_invoke(&self) -> bool {
//TODO: finish_load needs to run at some point if the generation changes.
self.elem.root().generation_id.get() == self.generation_id
}
}
impl HTMLMediaElementFetchListener {
fn new(elem: &HTMLMediaElement, url: ServoUrl, offset: u64) -> Self {
Self {
elem: Trusted::new(elem),
metadata: None,
generation_id: elem.generation_id.get(),
next_progress_event: time::get_time() + Duration::milliseconds(350),
resource_timing: ResourceFetchTiming::new(ResourceTimingType::Resource),
url,
expected_content_length: None,
latest_fetched_content: offset,
}
}
}
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