/
htmlmediaelement.rs
2772 lines (2455 loc) · 105 KB
/
htmlmediaelement.rs
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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::compartments::InCompartment;
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::NodeBinding::NodeBinding::NodeMethods;
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::{
cors_setting_for_element, reflect_cross_origin_attribute, set_cross_origin_attribute,
};
use crate::dom::element::{AttributeMutation, Element, ElementCreator};
use crate::dom::event::Event;
use crate::dom::eventtarget::EventTarget;
use crate::dom::globalscope::GlobalScope;
use crate::dom::htmlelement::HTMLElement;
use crate::dom::htmlscriptelement::HTMLScriptElement;
use crate::dom::htmlsourceelement::HTMLSourceElement;
use crate::dom::htmlstyleelement::HTMLStyleElement;
use crate::dom::htmlvideoelement::HTMLVideoElement;
use crate::dom::mediaerror::MediaError;
use crate::dom::mediafragmentparser::MediaFragmentParser;
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::shadowroot::IsUserAgentWidget;
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 embedder_traits::resources::{self, Resource as EmbedderResource};
use euclid::default::Size2D;
use headers::{ContentLength, ContentRange, HeaderMapExt};
use html5ever::{LocalName, Prefix};
use http::header::{self, HeaderMap, HeaderValue};
use ipc_channel::ipc;
use ipc_channel::router::ROUTER;
use media::{glplayer_channel, GLPlayerMsg, GLPlayerMsgForward};
use net_traits::image::base::Image;
use net_traits::image_cache::ImageResponse;
use net_traits::request::{CredentialsMode, Destination, Referrer, RequestBuilder, RequestMode};
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, SeekLock, StreamType};
use servo_media::{ClientContextId, ServoMedia, SupportsMediaType};
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::{ExternalImageData, ExternalImageId, ExternalImageType, TextureTarget};
use webrender_api::{ImageData, ImageDescriptor, ImageFormat, ImageKey, RenderApi};
use webrender_api::{RenderApiSender, Transaction};
#[derive(PartialEq)]
enum FrameStatus {
Locked,
Unlocked,
}
struct FrameHolder(FrameStatus, Frame);
impl FrameHolder {
fn new(frame: Frame) -> FrameHolder {
FrameHolder(FrameStatus::Unlocked, frame)
}
fn lock(&mut self) {
if self.0 == FrameStatus::Unlocked {
self.0 = FrameStatus::Locked;
};
}
fn unlock(&mut self) {
if self.0 == FrameStatus::Locked {
self.0 = FrameStatus::Unlocked;
};
}
fn set(&mut self, new_frame: Frame) {
if self.0 == FrameStatus::Unlocked {
self.1 = new_frame
};
}
fn get(&self) -> (u32, Size2D<i32>, usize) {
if self.0 == FrameStatus::Locked {
(
self.1.get_texture_id(),
Size2D::new(self.1.get_width(), self.1.get_height()),
0,
)
} else {
unreachable!();
}
}
}
pub struct MediaFrameRenderer {
player_id: Option<u64>,
api: RenderApi,
current_frame: Option<(ImageKey, i32, i32)>,
old_frame: Option<ImageKey>,
very_old_frame: Option<ImageKey>,
current_frame_holder: Option<FrameHolder>,
}
impl MediaFrameRenderer {
fn new(render_api_sender: RenderApiSender) -> Self {
Self {
player_id: None,
api: render_api_sender.create_api(),
current_frame: None,
old_frame: None,
very_old_frame: None,
current_frame_holder: 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 mut txn = Transaction::new();
if let Some(old_image_key) = mem::replace(&mut self.very_old_frame, self.old_frame.take()) {
txn.delete_image(old_image_key);
}
let descriptor = ImageDescriptor::new(
frame.get_width(),
frame.get_height(),
ImageFormat::BGRA8,
false,
false,
);
match self.current_frame {
Some((ref image_key, ref mut width, ref mut height))
if *width == frame.get_width() && *height == frame.get_height() =>
{
if !frame.is_gl_texture() {
txn.update_image(
*image_key,
descriptor,
ImageData::Raw(frame.get_data()),
&webrender_api::DirtyRect::All,
);
} else if self.player_id.is_some() {
self.current_frame_holder
.get_or_insert_with(|| FrameHolder::new(frame.clone()))
.set(frame);
}
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();
/* update current_frame */
*image_key = new_image_key;
*width = frame.get_width();
*height = frame.get_height();
let image_data = if frame.is_gl_texture() && self.player_id.is_some() {
let texture_target = if frame.is_external_oes() {
TextureTarget::External
} else {
TextureTarget::Default
};
self.current_frame_holder
.get_or_insert_with(|| FrameHolder::new(frame.clone()))
.set(frame);
ImageData::External(ExternalImageData {
id: ExternalImageId(self.player_id.unwrap()),
channel_index: 0,
image_type: ExternalImageType::TextureHandle(texture_target),
})
} else {
ImageData::Raw(frame.get_data())
};
txn.add_image(new_image_key, descriptor, image_data, None);
},
None => {
let image_key = self.api.generate_image_key();
self.current_frame = Some((image_key, frame.get_width(), frame.get_height()));
let image_data = if frame.is_gl_texture() && self.player_id.is_some() {
let texture_target = if frame.is_external_oes() {
TextureTarget::External
} else {
TextureTarget::Default
};
self.current_frame_holder = Some(FrameHolder::new(frame));
ImageData::External(ExternalImageData {
id: ExternalImageId(self.player_id.unwrap()),
channel_index: 0,
image_type: ExternalImageType::TextureHandle(texture_target),
})
} else {
ImageData::Raw(frame.get_data())
};
txn.add_image(image_key, descriptor, image_data, None);
},
}
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<Arc<Mutex<dyn 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>>,
/// Player Id reported the player thread
id: Cell<u64>,
/// Media controls id.
/// In order to workaround the lack of privileged JS context, we secure the
/// the access to the "privileged" document.servoGetMediaControls(id) API by
/// keeping a whitelist of media controls identifiers.
media_controls_id: DomRefCell<Option<String>>,
}
/// <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),
id: Cell::new(0),
media_controls_id: 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.lock().unwrap().set_rate(self.playbackRate.get()) {
warn!("Could not set the playback rate {:?}", e);
}
if let Err(e) = player.lock().unwrap().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.lock().unwrap().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>, seek_lock: Option<SeekLock>) {
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;
}
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)
// https://html.spec.whatwg.org/multipage/#create-a-potential-cors-request
.mode(match cors_setting_for_element(self.upcast::<Element>()) {
Some(_) => RequestMode::CorsMode,
None => RequestMode::NoCors,
})
.use_url_credentials(true)
.origin(document.origin().immutable().clone())
.pipeline_id(Some(self.global().pipeline_id()))
.referrer(Some(Referrer::ReferrerUrl(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),
seek_lock,
)));
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, 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, None);
},
SrcObject::MediaStream(ref stream) => {
let tracks = &*stream.get_tracks();
for (pos, track) in tracks.iter().enumerate() {
if let Err(_) = self
.player
.borrow()
.as_ref()
.unwrap()
.lock()
.unwrap()
.set_stream(&track.id(), pos == tracks.len() - 1)
{
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.