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/*
* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/IDAllocator.h>
#include <AK/Time.h>
#include <LibGfx/Bitmap.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.h>
#include <LibVideo/PlaybackManager.h>
#include <LibVideo/Track.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/VideoTrackPrototype.h>
#include <LibWeb/DOM/Event.h>
#include <LibWeb/HTML/EventNames.h>
#include <LibWeb/HTML/HTMLMediaElement.h>
#include <LibWeb/HTML/HTMLVideoElement.h>
#include <LibWeb/HTML/VideoTrack.h>
#include <LibWeb/HTML/VideoTrackList.h>
namespace Web::HTML {
static IDAllocator s_video_track_id_allocator;
VideoTrack::VideoTrack(JS::Realm& realm, JS::NonnullGCPtr<HTMLMediaElement> media_element, NonnullOwnPtr<Video::PlaybackManager> playback_manager)
: PlatformObject(realm)
, m_media_element(media_element)
, m_playback_manager(move(playback_manager))
{
m_playback_manager->on_video_frame = [this](auto frame) {
auto playback_position = static_cast<double>(position().to_milliseconds()) / 1000.0;
if (is<HTMLVideoElement>(*m_media_element))
verify_cast<HTMLVideoElement>(*m_media_element).set_current_frame({}, move(frame), playback_position);
m_media_element->set_current_playback_position(playback_position);
};
m_playback_manager->on_playback_state_change = [this]() {
switch (m_playback_manager->get_state()) {
case Video::PlaybackState::Stopped: {
auto playback_position_ms = static_cast<double>(duration().to_milliseconds());
m_media_element->set_current_playback_position(playback_position_ms / 1000.0);
break;
}
default:
break;
}
};
m_playback_manager->on_decoder_error = [this](auto error) {
auto error_message = String::from_utf8(error.description()).release_value_but_fixme_should_propagate_errors();
m_media_element->set_decoder_error(move(error_message)).release_value_but_fixme_should_propagate_errors();
};
m_playback_manager->on_fatal_playback_error = [this](auto error) {
auto error_message = String::from_utf8(error.string_literal()).release_value_but_fixme_should_propagate_errors();
m_media_element->set_decoder_error(move(error_message)).release_value_but_fixme_should_propagate_errors();
};
}
VideoTrack::~VideoTrack()
{
auto id = m_id.to_number<int>();
VERIFY(id.has_value());
s_video_track_id_allocator.deallocate(id.value());
}
JS::ThrowCompletionOr<void> VideoTrack::initialize(JS::Realm& realm)
{
MUST_OR_THROW_OOM(Base::initialize(realm));
set_prototype(&Bindings::ensure_web_prototype<Bindings::VideoTrackPrototype>(realm, "VideoTrack"));
auto id = s_video_track_id_allocator.allocate();
m_id = TRY_OR_THROW_OOM(realm.vm(), String::number(id));
return {};
}
void VideoTrack::visit_edges(Cell::Visitor& visitor)
{
visitor.visit(m_media_element);
visitor.visit(m_video_track_list);
}
void VideoTrack::play_video(Badge<HTMLVideoElement>)
{
m_playback_manager->resume_playback();
}
void VideoTrack::pause_video(Badge<HTMLVideoElement>)
{
m_playback_manager->pause_playback();
}
Time VideoTrack::position() const
{
return m_playback_manager->current_playback_time();
}
Time VideoTrack::duration() const
{
return m_playback_manager->selected_video_track().video_data().duration;
}
void VideoTrack::seek(Time position, MediaSeekMode seek_mode)
{
switch (seek_mode) {
case MediaSeekMode::Accurate:
m_playback_manager->seek_to_timestamp(position, Video::PlaybackManager::SeekMode::Accurate);
break;
case MediaSeekMode::ApproximateForSpeed:
m_playback_manager->seek_to_timestamp(position, Video::PlaybackManager::SeekMode::Fast);
break;
}
}
u64 VideoTrack::pixel_width() const
{
return m_playback_manager->selected_video_track().video_data().pixel_width;
}
u64 VideoTrack::pixel_height() const
{
return m_playback_manager->selected_video_track().video_data().pixel_height;
}
// https://html.spec.whatwg.org/multipage/media.html#dom-videotrack-selected
void VideoTrack::set_selected(bool selected)
{
// On setting, it must select the track if the new value is true, and unselect it otherwise.
if (m_selected == selected)
return;
// If the track is in a VideoTrackList, then all the other VideoTrack objects in that list must be unselected. (If the track is
// no longer in a VideoTrackList object, then the track being selected or unselected has no effect beyond changing the value of
// the attribute on the VideoTrack object.)
if (m_video_track_list) {
for (auto video_track : m_video_track_list->video_tracks({})) {
if (video_track.ptr() != this)
video_track->m_selected = false;
}
// Whenever a track in a VideoTrackList that was previously not selected is selected, and whenever the selected track in a
// VideoTrackList is unselected without a new track being selected in its stead, the user agent must queue a media element
// task given the media element to fire an event named change at the VideoTrackList object. This task must be queued before
// the task that fires the resize event, if any.
auto previously_unselected_track_is_selected = !m_selected && selected;
auto selected_track_was_unselected_without_another_selection = m_selected && !selected;
if (previously_unselected_track_is_selected || selected_track_was_unselected_without_another_selection) {
m_media_element->queue_a_media_element_task([this]() {
m_video_track_list->dispatch_event(DOM::Event::create(realm(), HTML::EventNames::change).release_value_but_fixme_should_propagate_errors());
});
}
}
m_selected = selected;
// AD-HOC: Inform the video element node that we have (un)selected a video track for layout.
if (is<HTMLVideoElement>(*m_media_element)) {
auto& video_element = verify_cast<HTMLVideoElement>(*m_media_element);
video_element.set_video_track(m_selected ? this : nullptr);
}
}
}
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