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/*
* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/IDAllocator.h>
#include <LibGfx/Bitmap.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.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::Matroska::MatroskaDemuxer> demuxer, Video::Track track)
: PlatformObject(realm)
, m_media_element(media_element)
, m_demuxer(move(demuxer))
, m_track(track)
{
}
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);
}
RefPtr<Gfx::Bitmap> VideoTrack::next_frame()
{
auto frame_sample = m_demuxer->get_next_video_sample_for_track(m_track);
if (frame_sample.is_error()) {
if (frame_sample.error().category() != Video::DecoderErrorCategory::EndOfStream)
dbgln("VideoTrack: Error getting next video sample: {}", frame_sample.error().description());
return {};
}
OwnPtr<Video::VideoFrame> decoded_frame;
while (!decoded_frame) {
auto result = m_decoder.receive_sample(frame_sample.value()->data());
if (result.is_error()) {
dbgln("VideoTrack: Error receiving video sample data: {}", frame_sample.error().description());
return {};
}
while (true) {
auto frame_result = m_decoder.get_decoded_frame();
if (frame_result.is_error()) {
if (frame_result.error().category() == Video::DecoderErrorCategory::NeedsMoreInput)
break;
dbgln("VideoTrack: Error decoding video frame: {}", frame_result.error().description());
return {};
}
decoded_frame = frame_result.release_value();
VERIFY(decoded_frame);
}
}
auto& cicp = decoded_frame->cicp();
cicp.adopt_specified_values(frame_sample.value()->container_cicp());
cicp.default_code_points_if_unspecified({ Video::ColorPrimaries::BT709, Video::TransferCharacteristics::BT709, Video::MatrixCoefficients::BT709, Video::VideoFullRangeFlag::Studio });
// BT.601, BT.709 and BT.2020 have a similar transfer function to sRGB, so other applications
// (Chromium, VLC) forgo transfer characteristics conversion. We will emulate that behavior by
// handling those as sRGB instead, which causes no transfer function change in the output,
// unless display color management is later implemented.
switch (cicp.transfer_characteristics()) {
case Video::TransferCharacteristics::BT601:
case Video::TransferCharacteristics::BT709:
case Video::TransferCharacteristics::BT2020BitDepth10:
case Video::TransferCharacteristics::BT2020BitDepth12:
cicp.set_transfer_characteristics(Video::TransferCharacteristics::SRGB);
break;
default:
break;
}
auto bitmap = decoded_frame->to_bitmap();
if (bitmap.is_error())
return {};
return bitmap.release_value();
}
// 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.to_deprecated_fly_string()).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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