tdesktop/Telegram/SourceFiles/media/streaming/media_streaming_player.cpp

998 lines
25 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "media/streaming/media_streaming_player.h"
#include "media/streaming/media_streaming_file.h"
#include "media/streaming/media_streaming_loader.h"
#include "media/streaming/media_streaming_audio_track.h"
#include "media/streaming/media_streaming_video_track.h"
#include "media/audio/media_audio.h" // for SupportsSpeedControl()
#include "data/data_document.h" // for DocumentData::duration()
namespace Media {
namespace Streaming {
namespace {
constexpr auto kBufferFor = 3 * crl::time(1000);
constexpr auto kLoadInAdvanceForRemote = 32 * crl::time(1000);
constexpr auto kLoadInAdvanceForLocal = 5 * crl::time(1000);
constexpr auto kMsFrequency = 1000; // 1000 ms per second.
// If we played for 3 seconds and got stuck it looks like we're loading
// slower than we're playing, so load full file in that case.
//constexpr auto kLoadFullIfStuckAfterPlayback = 3 * crl::time(1000);
[[nodiscard]] bool FullTrackReceived(const TrackState &state) {
return (state.duration != kTimeUnknown)
&& (state.receivedTill == state.duration);
}
void SaveValidStateInformation(TrackState &to, TrackState &&from) {
Expects(from.position != kTimeUnknown);
Expects(from.receivedTill != kTimeUnknown);
Expects(from.duration != kTimeUnknown);
to.duration = from.duration;
to.position = from.position;
to.receivedTill = (to.receivedTill == kTimeUnknown)
? from.receivedTill
: std::clamp(
std::max(from.receivedTill, to.receivedTill),
to.position,
to.duration);
}
void SaveValidAudioInformation(
AudioInformation &to,
AudioInformation &&from) {
SaveValidStateInformation(to.state, std::move(from.state));
}
void SaveValidVideoInformation(
VideoInformation &to,
VideoInformation &&from) {
Expects(!from.size.isEmpty());
Expects(!from.cover.isNull());
SaveValidStateInformation(to.state, std::move(from.state));
to.size = from.size;
to.cover = std::move(from.cover);
to.rotation = from.rotation;
}
void SaveValidStartInformation(Information &to, Information &&from) {
if (from.audio.state.duration != kTimeUnknown) {
SaveValidAudioInformation(to.audio, std::move(from.audio));
}
if (from.video.state.duration != kTimeUnknown) {
SaveValidVideoInformation(to.video, std::move(from.video));
}
if (from.headerSize && !to.headerSize) {
to.headerSize = from.headerSize;
}
}
} // namespace
Player::Player(std::shared_ptr<Reader> reader)
: _file(std::make_unique<File>(std::move(reader)))
, _remoteLoader(_file->isRemoteLoader())
, _renderFrameTimer([=] { checkNextFrameRender(); }) {
}
not_null<FileDelegate*> Player::delegate() {
return static_cast<FileDelegate*>(this);
}
void Player::checkNextFrameRender() {
Expects(_nextFrameTime != kTimeUnknown);
const auto now = crl::now();
if (now < _nextFrameTime) {
if (!_renderFrameTimer.isActive()) {
_renderFrameTimer.callOnce(_nextFrameTime - now);
}
} else {
_renderFrameTimer.cancel();
renderFrame(now);
}
}
void Player::checkNextFrameAvailability() {
Expects(_video != nullptr);
_nextFrameTime = _video->nextFrameDisplayTime();
Assert(_nextFrameTime != kFrameDisplayTimeAlreadyDone);
if (_nextFrameTime != kTimeUnknown) {
checkNextFrameRender();
}
}
void Player::renderFrame(crl::time now) {
Expects(_video != nullptr);
Expects(_nextFrameTime != kTimeUnknown);
Expects(_nextFrameTime != kFrameDisplayTimeAlreadyDone);
const auto position = _video->markFrameDisplayed(now);
if (_options.waitForMarkAsShown) {
_currentFrameTime = _nextFrameTime;
_nextFrameTime = kFrameDisplayTimeAlreadyDone;
} else {
_video->markFrameShown();
_nextFrameTime = kTimeUnknown;
}
Assert(position != kTimeUnknown);
videoPlayedTill(position);
}
bool Player::markFrameShown() {
Expects(_video != nullptr);
if (_nextFrameTime == kFrameDisplayTimeAlreadyDone) {
_nextFrameTime = kTimeUnknown;
_video->addTimelineDelay(crl::now() - _currentFrameTime);
}
return _video->markFrameShown();
}
void Player::setLoaderPriority(int priority) {
_file->setLoaderPriority(priority);
}
template <typename Track>
void Player::trackReceivedTill(
const Track &track,
TrackState &state,
crl::time position) {
if (position == kTimeUnknown) {
return;
} else if (state.duration != kTimeUnknown) {
if (state.receivedTill < position) {
state.receivedTill = position;
trackSendReceivedTill(track, state);
}
} else {
state.receivedTill = position;
}
if (!_pauseReading
&& bothReceivedEnough(loadInAdvanceFor())
&& !receivedTillEnd()) {
_pauseReading = true;
}
}
template <typename Track>
void Player::trackPlayedTill(
const Track &track,
TrackState &state,
crl::time position) {
const auto guard = base::make_weak(&_sessionGuard);
trackReceivedTill(track, state, position);
if (guard && position != kTimeUnknown) {
state.position = position;
const auto value = _options.loop
? (position % computeTotalDuration())
: position;
_updates.fire({ PlaybackUpdate<Track>{ value } });
}
if (_pauseReading
&& (!bothReceivedEnough(loadInAdvanceFor()) || receivedTillEnd())) {
_pauseReading = false;
_file->wake();
}
}
template <typename Track>
void Player::trackSendReceivedTill(
const Track &track,
TrackState &state) {
Expects(state.duration != kTimeUnknown);
Expects(state.receivedTill != kTimeUnknown);
if (!_remoteLoader || _fullInCacheSinceStart.value_or(false)) {
return;
}
const auto receivedTill = std::max(
state.receivedTill,
_previousReceivedTill);
const auto value = _options.loop
? (receivedTill % computeTotalDuration())
: receivedTill;
_updates.fire({ PreloadedUpdate<Track>{ value } });
}
void Player::audioReceivedTill(crl::time position) {
Expects(_audio != nullptr);
trackReceivedTill(*_audio, _information.audio.state, position);
checkResumeFromWaitingForData();
}
void Player::audioPlayedTill(crl::time position) {
Expects(_audio != nullptr);
trackPlayedTill(*_audio, _information.audio.state, position);
}
void Player::videoReceivedTill(crl::time position) {
Expects(_video != nullptr);
trackReceivedTill(*_video, _information.video.state, position);
checkResumeFromWaitingForData();
}
void Player::videoPlayedTill(crl::time position) {
Expects(_video != nullptr);
trackPlayedTill(*_video, _information.video.state, position);
}
bool Player::fileReady(int headerSize, Stream &&video, Stream &&audio) {
_waitingForData = false;
const auto weak = base::make_weak(&_sessionGuard);
const auto ready = [=](const Information &data) {
crl::on_main(weak, [=, data = data]() mutable {
data.headerSize = headerSize;
streamReady(std::move(data));
});
};
const auto error = [=](Error error) {
crl::on_main(weak, [=] {
streamFailed(error);
});
};
const auto mode = _options.mode;
if ((mode != Mode::Audio && mode != Mode::Both)
|| audio.duration == kDurationUnavailable) {
audio = Stream();
}
if (mode != Mode::Video && mode != Mode::Both) {
video = Stream();
}
if (audio.duration == kDurationUnavailable) {
LOG(("Streaming Error: Audio stream with unknown duration."));
return false;
} else if (audio.codec) {
if (_options.audioId.audio() != nullptr) {
_audioId = AudioMsgId(
_options.audioId.audio(),
_options.audioId.contextId(),
AudioMsgId::CreateExternalPlayId());
} else {
_audioId = AudioMsgId::ForVideo();
}
_audio = std::make_unique<AudioTrack>(
_options,
std::move(audio),
_audioId,
ready,
error);
} else if (audio.index >= 0) {
LOG(("Streaming Error: No codec for audio stream %1, mode %2."
).arg(audio.index
).arg(int(mode)));
return false;
} else {
_audioId = AudioMsgId();
}
if (video.codec) {
_video = std::make_unique<VideoTrack>(
_options,
std::move(video),
_audioId,
ready,
error);
} else if (video.index >= 0) {
LOG(("Streaming Error: No codec for video stream %1, mode %2."
).arg(video.index
).arg(int(mode)));
return false;
}
if ((mode == Mode::Audio && !_audio)
|| (mode == Mode::Video && !_video)
|| (!_audio && !_video)) {
LOG(("Streaming Error: Required stream not found for mode %1."
).arg(int(mode)));
return false;
} else if (_audio
&& _video
&& _video->streamDuration() == kDurationUnavailable) {
LOG(("Streaming Error: Both streams with unknown video duration."));
return false;
}
_totalDuration = std::max(
_audio ? _audio->streamDuration() : kTimeUnknown,
_video ? _video->streamDuration() : kTimeUnknown);
Ensures(_totalDuration > 1);
return true;
}
void Player::fileError(Error error) {
_waitingForData = false;
crl::on_main(&_sessionGuard, [=] {
fail(error);
});
}
void Player::fileFullInCache(bool fullInCache) {
crl::on_main(&_sessionGuard, [=] {
if (!_fullInCacheSinceStart.has_value()) {
_fullInCacheSinceStart = fullInCache;
}
_fullInCache.fire_copy(fullInCache);
});
}
void Player::fileWaitingForData() {
if (_waitingForData) {
return;
}
_waitingForData = true;
if (_audio) {
_audio->waitForData();
}
if (_video) {
_video->waitForData();
}
}
bool Player::fileProcessPackets(
base::flat_map<int, std::vector<FFmpeg::Packet>> &packets) {
_waitingForData = false;
for (auto &[index, list] : packets) {
if (list.empty()) {
continue;
}
if (_audio && _audio->streamIndex() == index) {
//for (const auto &packet : list) {
// // Maybe it is enough to count by list.back()?.. hope so.
// accumulate_max(
// _durationByLastAudioPacket,
// durationByPacket(*_audio, packet));
//}
accumulate_max(
_durationByLastAudioPacket,
durationByPacket(*_audio, list.back()));
const auto till = _loopingShift + std::clamp(
FFmpeg::PacketPosition(
list.back(),
_audio->streamTimeBase()),
crl::time(0),
computeAudioDuration() - 1);
crl::on_main(&_sessionGuard, [=] {
audioReceivedTill(till);
});
_audio->process(base::take(list));
} else if (_video && _video->streamIndex() == index) {
//for (const auto &packet : list) {
// // Maybe it is enough to count by list.back()?.. hope so.
// accumulate_max(
// _durationByLastVideoPacket,
// durationByPacket(*_video, packet));
//}
accumulate_max(
_durationByLastVideoPacket,
durationByPacket(*_video, list.back()));
const auto till = _loopingShift + std::clamp(
FFmpeg::PacketPosition(
list.back(),
_video->streamTimeBase()),
crl::time(0),
computeVideoDuration() - 1);
crl::on_main(&_sessionGuard, [=] {
videoReceivedTill(till);
});
_video->process(base::take(list));
} else {
list.clear(); // Free non-needed packets.
}
}
return fileReadMore();
}
void Player::fileProcessEndOfFile() {
_waitingForData = false;
_readTillEnd = true;
setDurationByPackets();
const auto generateEmptyQueue = [] {
auto result = std::vector<FFmpeg::Packet>();
result.emplace_back();
return result;
};
if (_audio) {
const auto till = _loopingShift + computeAudioDuration();
crl::on_main(&_sessionGuard, [=] {
audioReceivedTill(till);
});
_audio->process(generateEmptyQueue());
}
if (_video) {
const auto till = _loopingShift + computeVideoDuration();
crl::on_main(&_sessionGuard, [=] {
videoReceivedTill(till);
});
_video->process(generateEmptyQueue());
}
}
bool Player::fileReadMore() {
if (_options.loop && _readTillEnd) {
const auto duration = computeTotalDuration();
if (duration == kDurationUnavailable) {
LOG(("Streaming Error: "
"Couldn't find out the real stream duration."));
fileError(Error::InvalidData);
return false;
}
_loopingShift += duration;
_readTillEnd = false;
return true;
}
return !_readTillEnd && !_pauseReading;
}
void Player::streamReady(Information &&information) {
SaveValidStartInformation(_information, std::move(information));
provideStartInformation();
}
void Player::streamFailed(Error error) {
fail(error);
}
template <typename Track>
int Player::durationByPacket(
const Track &track,
const FFmpeg::Packet &packet) {
// We've set this value on the first cycle.
if (_loopingShift || _totalDuration != kDurationUnavailable) {
return 0;
}
const auto result = DurationByPacket(packet, track.streamTimeBase());
if (result < 0) {
fileError(Error::InvalidData);
return 0;
}
Ensures(result > 0);
return result;
}
void Player::setDurationByPackets() {
if (_loopingShift || _totalDuration != kDurationUnavailable) {
return;
}
const auto duration = std::max(
_durationByLastAudioPacket,
_durationByLastVideoPacket);
if (duration > 1) {
_durationByPackets = duration;
} else {
LOG(("Streaming Error: Bad total duration by packets: %1"
).arg(duration));
fileError(Error::InvalidData);
}
}
void Player::provideStartInformation() {
Expects(_stage == Stage::Initializing);
if ((_audio && _information.audio.state.duration == kTimeUnknown)
|| (_video && _information.video.state.duration == kTimeUnknown)) {
return; // Not ready yet.
} else if ((!_audio && !_video)
|| (!_audio && _options.mode == Mode::Audio)
|| (!_video && _options.mode == Mode::Video)) {
fail(Error::OpenFailed);
} else {
_stage = Stage::Ready;
if (_audio && _audioFinished) {
// Audio was stopped before it was ready.
_audio->stop();
}
// Don't keep the reference to the video cover.
auto copy = _information;
_information.video.cover = QImage();
_updates.fire(Update{ std::move(copy) });
if (_stage == Stage::Ready && !_paused) {
_paused = true;
updatePausedState();
}
}
}
void Player::fail(Error error) {
_sessionLifetime = rpl::lifetime();
const auto stopGuarded = crl::guard(&_sessionGuard, [=] { stop(); });
_lastFailure = error;
_updates.fire_error(std::move(error));
stopGuarded();
}
void Player::play(const PlaybackOptions &options) {
Expects(options.speed >= 0.5 && options.speed <= 2.);
// Looping video with audio is not supported for now.
Expects(!options.loop || (options.mode != Mode::Both));
const auto previous = getCurrentReceivedTill(computeTotalDuration());
stop(true);
_lastFailure = std::nullopt;
savePreviousReceivedTill(options, previous);
_options = options;
if (!Media::Audio::SupportsSpeedControl()) {
_options.speed = 1.;
}
_stage = Stage::Initializing;
_file->start(delegate(), _options.position);
}
void Player::savePreviousReceivedTill(
const PlaybackOptions &options,
crl::time previousReceivedTill) {
// Save previous 'receivedTill' values if we seek inside the range.
_previousReceivedTill = ((options.position >= _options.position)
&& (options.mode == _options.mode)
&& (options.position < previousReceivedTill))
? previousReceivedTill
: kTimeUnknown;
}
crl::time Player::loadInAdvanceFor() const {
return _remoteLoader ? kLoadInAdvanceForRemote : kLoadInAdvanceForLocal;
}
crl::time Player::computeTotalDuration() const {
if (_totalDuration != kDurationUnavailable) {
return _totalDuration;
} else if (const auto byPackets = _durationByPackets.load()) {
return byPackets;
}
return kDurationUnavailable;
}
crl::time Player::computeAudioDuration() const {
Expects(_audio != nullptr);
const auto result = _audio->streamDuration();
if (result != kDurationUnavailable) {
return result;
} else if ((_loopingShift || _readTillEnd)
&& _durationByLastAudioPacket) {
// We looped, so it already holds full stream duration.
return _durationByLastAudioPacket;
}
return kDurationUnavailable;
}
crl::time Player::computeVideoDuration() const {
Expects(_video != nullptr);
const auto result = _video->streamDuration();
if (result != kDurationUnavailable) {
return result;
} else if ((_loopingShift || _readTillEnd)
&& _durationByLastVideoPacket) {
// We looped, so it already holds full stream duration.
return _durationByLastVideoPacket;
}
return kDurationUnavailable;
}
void Player::pause() {
Expects(active());
_pausedByUser = true;
updatePausedState();
}
void Player::resume() {
Expects(active());
_pausedByUser = false;
updatePausedState();
}
void Player::stop() {
stop(false);
}
void Player::stopAudio() {
if (!_video) {
stop();
} else if (_audio) {
_audioFinished = true;
if (_information.audio.state.duration != kTimeUnknown) {
// Audio is ready.
_audio->stop();
}
}
}
void Player::updatePausedState() {
const auto paused = _pausedByUser || _pausedByWaitingForData;
if (_paused == paused) {
return;
}
_paused = paused;
if (!_paused && _stage == Stage::Ready) {
const auto guard = base::make_weak(&_sessionGuard);
start();
if (!guard) {
return;
}
}
if (_stage != Stage::Started) {
return;
}
if (_paused) {
_pausedTime = crl::now();
//if (_pausedByWaitingForData
// && _pausedTime - _startedTime > kLoadFullIfStuckAfterPlayback) {
// _loadFull = true;
//}
if (_audio) {
_audio->pause(_pausedTime);
}
if (_video) {
_video->pause(_pausedTime);
}
} else {
_startedTime = crl::now();
if (_audio) {
_audio->resume(_startedTime);
}
if (_video) {
_video->resume(_startedTime);
}
}
}
bool Player::trackReceivedEnough(
const TrackState &state,
crl::time amount) const {
return (!_options.loop && FullTrackReceived(state))
|| (state.position != kTimeUnknown
&& (state.position + std::min(amount, state.duration)
<= state.receivedTill));
}
bool Player::bothReceivedEnough(crl::time amount) const {
const auto &info = _information;
return (!_audio || trackReceivedEnough(info.audio.state, amount))
&& (!_video || trackReceivedEnough(info.video.state, amount));
}
bool Player::receivedTillEnd() const {
if (_options.loop) {
return false;
}
return (!_video || FullTrackReceived(_information.video.state))
&& (!_audio || FullTrackReceived(_information.audio.state));
}
void Player::checkResumeFromWaitingForData() {
if (_pausedByWaitingForData && bothReceivedEnough(kBufferFor)) {
_pausedByWaitingForData = false;
updatePausedState();
_updates.fire({ WaitingForData{ false } });
}
}
void Player::start() {
Expects(_stage == Stage::Ready);
_stage = Stage::Started;
const auto guard = base::make_weak(&_sessionGuard);
rpl::merge(
_audio ? _audio->waitingForData() : nullptr,
_video ? _video->waitingForData() : nullptr
) | rpl::filter([=] {
return !bothReceivedEnough(kBufferFor);
}) | rpl::start_with_next([=] {
_pausedByWaitingForData = true;
updatePausedState();
_updates.fire({ WaitingForData{ true } });
}, _sessionLifetime);
if (guard && _audio && !_audioFinished) {
_audio->playPosition(
) | rpl::start_with_next_done([=](crl::time position) {
audioPlayedTill(position);
}, [=] {
Expects(_stage == Stage::Started);
_audioFinished = true;
if (!_video || _videoFinished) {
_updates.fire({ Finished() });
}
}, _sessionLifetime);
}
if (guard && _video) {
_video->checkNextFrame(
) | rpl::start_with_next_done([=] {
checkVideoStep();
}, [=] {
Assert(_stage == Stage::Started);
_videoFinished = true;
if (!_audio || _audioFinished) {
_updates.fire({ Finished() });
}
}, _sessionLifetime);
crl::on_main_update_requests(
) | rpl::filter([=] {
return !_videoFinished;
}) | rpl::start_with_next([=] {
checkVideoStep();
}, _sessionLifetime);
}
if (guard && _audio) {
if (_audioFinished) {
if (!_video || _videoFinished) {
_updates.fire({ Finished() });
}
} else {
trackSendReceivedTill(*_audio, _information.audio.state);
}
}
if (guard && _video) {
trackSendReceivedTill(*_video, _information.video.state);
}
}
void Player::checkVideoStep() {
if (_nextFrameTime == kFrameDisplayTimeAlreadyDone) {
return;
} else if (_nextFrameTime != kTimeUnknown) {
checkNextFrameRender();
} else {
checkNextFrameAvailability();
}
}
void Player::stop(bool stillActive) {
_file->stop(stillActive);
_sessionLifetime = rpl::lifetime();
_stage = Stage::Uninitialized;
_audio = nullptr;
_video = nullptr;
invalidate_weak_ptrs(&_sessionGuard);
_pausedByUser = _pausedByWaitingForData = _paused = false;
_renderFrameTimer.cancel();
_nextFrameTime = kTimeUnknown;
_audioFinished = false;
_videoFinished = false;
_pauseReading = false;
_readTillEnd = false;
_loopingShift = 0;
_durationByPackets = 0;
_durationByLastAudioPacket = 0;
_durationByLastVideoPacket = 0;
const auto header = _information.headerSize;
_information = Information();
_information.headerSize = header;
}
std::optional<Error> Player::failed() const {
return _lastFailure;
}
bool Player::playing() const {
return (_stage == Stage::Started)
&& !paused()
&& !finished()
&& !failed();
}
bool Player::buffering() const {
return _pausedByWaitingForData;
}
bool Player::paused() const {
return _pausedByUser && active();
}
bool Player::finished() const {
return (_stage == Stage::Started)
&& (!_audio || _audioFinished)
&& (!_video || _videoFinished);
}
float64 Player::speed() const {
return _options.speed;
}
void Player::setSpeed(float64 speed) {
Expects(speed >= 0.5 && speed <= 2.);
if (!Media::Audio::SupportsSpeedControl()) {
speed = 1.;
}
if (_options.speed != speed) {
_options.speed = speed;
if (active()) {
if (_audio) {
_audio->setSpeed(speed);
}
if (_video) {
_video->setSpeed(speed);
}
}
}
}
void Player::setWaitForMarkAsShown(bool wait) {
if (_options.waitForMarkAsShown != wait) {
_options.waitForMarkAsShown = wait;
if (_video) {
_video->setWaitForMarkAsShown(wait);
}
}
}
bool Player::active() const {
return (_stage != Stage::Uninitialized) && !finished() && !failed();
}
bool Player::ready() const {
return (_stage != Stage::Uninitialized)
&& (_stage != Stage::Initializing);
}
rpl::producer<Update, Error> Player::updates() const {
return _updates.events();
}
rpl::producer<bool> Player::fullInCache() const {
return _fullInCache.events();
}
QSize Player::videoSize() const {
return _information.video.size;
}
QImage Player::frame(
const FrameRequest &request,
const Instance *instance) const {
Expects(_video != nullptr);
return _video->frame(request, instance);
}
FrameWithInfo Player::frameWithInfo(const Instance *instance) const {
Expects(_video != nullptr);
return _video->frameWithInfo(instance);
}
QImage Player::currentFrameImage() const {
Expects(_video != nullptr);
return _video->currentFrameImage();
}
void Player::unregisterInstance(not_null<const Instance*> instance) {
if (_video) {
_video->unregisterInstance(instance);
}
}
Media::Player::TrackState Player::prepareLegacyState() const {
using namespace Media::Player;
auto result = Media::Player::TrackState();
result.id = _audioId.externalPlayId() ? _audioId : _options.audioId;
result.state = (_lastFailure == Error::OpenFailed
|| _lastFailure == Error::NotStreamable)
? State::StoppedAtStart
: _lastFailure
? State::StoppedAtError
: finished()
? State::StoppedAtEnd
: (_stage == Stage::Uninitialized)
? State::Stopped
: paused()
? State::Paused
: State::Playing;
result.position = std::max(
_information.audio.state.position,
_information.video.state.position);
result.length = computeTotalDuration();
if (result.position == kTimeUnknown) {
result.position = _options.position;
} else if (_options.loop && result.length > 0) {
result.position %= result.length;
}
result.receivedTill = (_remoteLoader
&& !_fullInCacheSinceStart.value_or(false))
? getCurrentReceivedTill(result.length)
: 0;
result.frequency = kMsFrequency;
result.fileHeaderSize = _information.headerSize;
if (result.length == kTimeUnknown) {
const auto document = _options.audioId.audio();
const auto duration = document ? document->getDuration() : 0;
if (duration > 0) {
result.length = duration * crl::time(1000);
} else {
result.length = std::max(crl::time(result.position), crl::time(0));
}
}
return result;
}
crl::time Player::getCurrentReceivedTill(crl::time duration) const {
const auto forTrack = [&](const TrackState &state) {
return (state.duration > 0 && state.receivedTill == state.duration)
? std::max(state.receivedTill, duration)
: state.receivedTill;
};
const auto previous = std::max(_previousReceivedTill, crl::time(0));
const auto result = std::min(
std::max(forTrack(_information.audio.state), previous),
std::max(forTrack(_information.video.state), previous));
return (result >= 0 && duration > 1 && _options.loop)
? (result % duration)
: result;
}
void Player::lock() {
++_locks;
}
void Player::unlock() {
Expects(_locks > 0);
--_locks;
if (!_locks) {
stopAudio();
if (active()) {
setSpeed(1.);
}
setWaitForMarkAsShown(true);
}
}
bool Player::locked() const {
return (_locks > 0);
}
rpl::lifetime &Player::lifetime() {
return _lifetime;
}
Player::~Player() {
// The order of field destruction is important.
//
// We are forced to maintain the correct order in the stop() method,
// because it can be called even before the player destruction.
//
// So instead of maintaining it in the class definition as well we
// simply call stop() here, after that the destruction is trivial.
stop();
}
} // namespace Streaming
} // namespace Media