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https://github.com/LadybirdBrowser/ladybird
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470248e00d
PlaybackManager's ref counting was only used to keep it alive in a few callbacks. Instead, the callbacks can use weak references that can only be used from the thread that the PlaybackManager was created on, to ensure that the PlaybackManager can't be destroyed while being accessed. This ensures that: - The PlaybackManager is destroyed immediately when it is reassigned by HTMLMediaElement - No callbacks are invoked after that point This fixes the crash initially being addressed by #8081. The test from that PR has been included as a regression test.
308 lines
11 KiB
C++
308 lines
11 KiB
C++
/*
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* Copyright (c) 2022-2025, Gregory Bertilson <gregory@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibMedia/Containers/Matroska/MatroskaDemuxer.h>
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#include <LibMedia/Demuxer.h>
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#include <LibMedia/FFmpeg/FFmpegDemuxer.h>
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#include <LibMedia/PlaybackStates/PausedStateHandler.h>
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#include <LibMedia/Providers/AudioDataProvider.h>
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#include <LibMedia/Providers/GenericTimeProvider.h>
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#include <LibMedia/Providers/VideoDataProvider.h>
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#include <LibMedia/Providers/WrapperTimeProvider.h>
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#include <LibMedia/Sinks/AudioMixingSink.h>
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#include <LibMedia/Sinks/DisplayingVideoSink.h>
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#include <LibMedia/Track.h>
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#include <LibThreading/Thread.h>
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#include "PlaybackManager.h"
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namespace Media {
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DecoderErrorOr<void> PlaybackManager::prepare_playback_from_media_data(WeakPlaybackManager const& self, NonnullRefPtr<IncrementallyPopulatedStream> stream, NonnullRefPtr<Core::WeakEventLoopReference> const& main_thread_event_loop_reference)
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{
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auto demuxer = TRY([&] -> DecoderErrorOr<NonnullRefPtr<Demuxer>> {
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if (Matroska::Reader::is_matroska_or_webm(stream->create_cursor()))
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return Matroska::MatroskaDemuxer::from_stream(stream);
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return FFmpeg::FFmpegDemuxer::from_stream(stream);
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}());
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// Create the video tracks and their data providers.
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auto all_video_tracks = TRY(demuxer->get_tracks_for_type(TrackType::Video));
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auto supported_video_tracks = VideoTracks();
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auto supported_video_track_datas = VideoTrackDatas();
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supported_video_tracks.ensure_capacity(all_video_tracks.size());
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supported_video_track_datas.ensure_capacity(all_video_tracks.size());
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for (auto const& track : all_video_tracks) {
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auto video_data_provider_result = VideoDataProvider::try_create(main_thread_event_loop_reference, demuxer, track);
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if (video_data_provider_result.is_error())
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continue;
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supported_video_tracks.append(track);
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supported_video_track_datas.empend(VideoTrackData(track, video_data_provider_result.release_value(), nullptr));
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}
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supported_video_tracks.shrink_to_fit();
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supported_video_track_datas.shrink_to_fit();
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// Create all the audio tracks, their data providers, and the audio output.
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auto all_audio_tracks = TRY(demuxer->get_tracks_for_type(TrackType::Audio));
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auto supported_audio_tracks = AudioTracks();
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auto supported_audio_track_datas = AudioTrackDatas();
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supported_audio_tracks.ensure_capacity(all_audio_tracks.size());
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supported_audio_track_datas.ensure_capacity(all_audio_tracks.size());
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for (auto const& track : all_audio_tracks) {
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auto audio_data_provider_result = AudioDataProvider::try_create(main_thread_event_loop_reference, demuxer, track);
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if (audio_data_provider_result.is_error())
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continue;
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auto audio_data_provider = audio_data_provider_result.release_value();
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supported_audio_tracks.append(track);
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supported_audio_track_datas.empend(AudioTrackData(track, move(audio_data_provider)));
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}
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supported_audio_tracks.shrink_to_fit();
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supported_audio_track_datas.shrink_to_fit();
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if (supported_video_tracks.is_empty() && supported_audio_tracks.is_empty())
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return DecoderError::with_description(DecoderErrorCategory::NotImplemented, "No supported video or audio tracks found"sv);
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auto preferred_video_track = demuxer->get_preferred_track_for_type(TrackType::Video).value_or({});
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if (preferred_video_track.has_value() && !supported_video_tracks.contains_slow(*preferred_video_track))
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preferred_video_track = {};
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auto preferred_audio_track = demuxer->get_preferred_track_for_type(TrackType::Audio).value_or({});
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if (preferred_audio_track.has_value() && !supported_audio_tracks.contains_slow(*preferred_audio_track))
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preferred_audio_track = {};
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auto duration = demuxer->total_duration().value_or(AK::Duration::zero());
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auto main_thread_event_loop = main_thread_event_loop_reference->take();
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main_thread_event_loop->deferred_invoke([self, video_tracks = move(supported_video_tracks), video_track_datas = move(supported_video_track_datas), preferred_video_track, audio_tracks = move(supported_audio_tracks), audio_track_datas = move(supported_audio_track_datas), preferred_audio_track, duration] mutable {
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if (!self)
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return;
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self->m_video_tracks.extend(move(video_tracks));
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self->m_video_track_datas.extend(move(video_track_datas));
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self->m_audio_tracks.extend(move(audio_tracks));
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self->m_audio_track_datas.extend(move(audio_track_datas));
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self->m_preferred_video_track = preferred_video_track;
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self->m_preferred_audio_track = preferred_audio_track;
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self->check_for_duration_change(duration);
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self->set_up_data_providers();
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if (!self->m_audio_tracks.is_empty()) {
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self->m_audio_sink = MUST(AudioMixingSink::try_create());
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}
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if (auto audio_sink = self->m_audio_sink) {
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VERIFY(self->current_time().is_zero());
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self->m_time_provider = make_ref_counted<WrapperTimeProvider<AudioMixingSink>>(*audio_sink);
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}
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if (self->on_track_added) {
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for (auto const& audio_track : self->m_audio_tracks)
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self->on_track_added(TrackType::Audio, audio_track);
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for (auto const& video_track : self->m_video_tracks)
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self->on_track_added(TrackType::Video, video_track);
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}
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if (self->on_metadata_parsed)
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self->on_metadata_parsed();
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});
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return {};
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}
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NonnullOwnPtr<PlaybackManager> PlaybackManager::create()
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{
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auto playback_manager = adopt_own(*new (nothrow) PlaybackManager());
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playback_manager->m_handler = make<PausedStateHandler>(*playback_manager, RESUMING_SUSPEND_TIMEOUT_MS);
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playback_manager->m_handler->on_enter();
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return playback_manager;
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}
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PlaybackManager::PlaybackManager()
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: m_weak_link(make_ref_counted<WeakPlaybackManagerLink>(*this))
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, m_time_provider(make_ref_counted<GenericTimeProvider>())
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{
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}
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PlaybackManager::~PlaybackManager()
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{
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m_weak_link->revoke({});
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}
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void PlaybackManager::add_media_source(NonnullRefPtr<IncrementallyPopulatedStream> const& stream)
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{
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auto thread = Threading::Thread::construct("Media Init"sv, [self = weak(), stream = stream, main_thread_event_loop_reference = Core::EventLoop::current_weak()] mutable -> int {
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auto maybe_error = prepare_playback_from_media_data(self, stream, main_thread_event_loop_reference);
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if (maybe_error.is_error()) {
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auto main_thread_event_loop = main_thread_event_loop_reference->take();
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main_thread_event_loop->deferred_invoke([self = move(self), error = maybe_error.release_error()] mutable {
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if (!self)
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return;
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if (self->on_unsupported_format_error)
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self->on_unsupported_format_error(move(error));
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});
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return 0;
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}
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return 0;
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});
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thread->start();
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thread->detach();
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}
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WeakPlaybackManager PlaybackManager::weak()
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{
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return WeakPlaybackManager(m_weak_link);
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}
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void PlaybackManager::set_up_data_providers()
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{
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for (auto const& video_track_data : m_video_track_datas) {
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video_track_data.provider->set_error_handler([self = weak()](DecoderError&& error) {
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if (!self)
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return;
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self->dispatch_error(move(error));
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});
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video_track_data.provider->set_frame_end_time_handler([self = weak()](AK::Duration time) {
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if (!self)
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return;
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self->check_for_duration_change(time);
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});
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video_track_data.provider->set_frames_queue_is_full_handler([self = weak()] {
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if (!self)
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return;
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self->m_handler->exit_buffering();
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});
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}
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for (auto const& audio_track_data : m_audio_track_datas) {
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audio_track_data.provider->set_error_handler([self = weak()](DecoderError&& error) {
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if (!self)
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return;
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self->dispatch_error(move(error));
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});
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audio_track_data.provider->set_block_end_time_handler([self = weak()](AK::Duration time) {
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if (!self)
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return;
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self->check_for_duration_change(time);
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});
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}
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}
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void PlaybackManager::check_for_duration_change(AK::Duration duration)
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{
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if (m_duration >= duration)
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return;
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m_duration = duration;
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if (on_duration_change)
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on_duration_change(m_duration);
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}
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void PlaybackManager::dispatch_error(DecoderError&& error)
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{
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if (m_is_in_error_state)
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return;
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m_is_in_error_state = true;
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if (on_error)
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on_error(move(error));
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}
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PlaybackManager::VideoTrackData& PlaybackManager::get_video_data_for_track(Track const& track)
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{
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for (auto& track_data : m_video_track_datas) {
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if (track_data.track == track)
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return track_data;
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}
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VERIFY_NOT_REACHED();
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}
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NonnullRefPtr<DisplayingVideoSink> PlaybackManager::get_or_create_the_displaying_video_sink_for_track(Track const& track)
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{
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auto& track_data = get_video_data_for_track(track);
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if (track_data.display == nullptr) {
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track_data.display = MUST(Media::DisplayingVideoSink::try_create(m_time_provider));
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track_data.display->set_provider(track, track_data.provider);
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track_data.display->m_on_start_buffering = [this] {
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m_handler->enter_buffering();
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};
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m_handler->on_track_enabled(track);
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}
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VERIFY(track_data.display->provider(track) == track_data.provider);
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return *track_data.display;
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}
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void PlaybackManager::remove_the_displaying_video_sink_for_track(Track const& track)
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{
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auto& track_data = get_video_data_for_track(track);
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track_data.display->set_provider(track, nullptr);
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track_data.display = nullptr;
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}
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PlaybackManager::AudioTrackData& PlaybackManager::get_audio_data_for_track(Track const& track)
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{
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for (auto& track_data : m_audio_track_datas) {
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if (track_data.track == track)
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return track_data;
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}
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VERIFY_NOT_REACHED();
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}
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void PlaybackManager::enable_an_audio_track(Track const& track)
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{
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auto& track_data = get_audio_data_for_track(track);
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auto had_provider = m_audio_sink->provider(track) != nullptr;
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m_audio_sink->set_provider(track, track_data.provider);
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if (!had_provider) {
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m_handler->on_track_enabled(track);
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}
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}
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void PlaybackManager::disable_an_audio_track(Track const& track)
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{
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auto& track_data = get_audio_data_for_track(track);
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VERIFY(track_data.provider == m_audio_sink->provider(track));
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m_audio_sink->set_provider(track, nullptr);
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}
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void PlaybackManager::play()
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{
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m_handler->play();
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}
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void PlaybackManager::pause()
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{
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m_handler->pause();
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}
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void PlaybackManager::seek(AK::Duration timestamp, SeekMode mode)
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{
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m_handler->seek(timestamp, mode);
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m_is_in_error_state = false;
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}
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bool PlaybackManager::is_playing()
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{
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return m_handler->is_playing();
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}
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PlaybackState PlaybackManager::state()
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{
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return m_handler->state();
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}
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void PlaybackManager::set_volume(double volume)
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{
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if (m_audio_sink)
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m_audio_sink->set_volume(volume);
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}
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}
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