tdesktop/Telegram/SourceFiles/media/streaming/media_streaming_audio_track...

173 lines
4.1 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_audio_track.h"
#include "media/streaming/media_streaming_utility.h"
#include "media/audio/media_audio.h"
#include "media/audio/media_child_ffmpeg_loader.h"
#include "media/player/media_player_instance.h"
namespace Media {
namespace Streaming {
AudioTrack::AudioTrack(
const PlaybackOptions &options,
Stream &&stream,
AudioMsgId audioId,
FnMut<void(const Information &)> ready,
Fn<void()> error)
: _options(options)
, _stream(std::move(stream))
, _audioId(audioId)
, _ready(std::move(ready))
, _error(std::move(error))
, _playPosition(options.position) {
Expects(_ready != nullptr);
Expects(_error != nullptr);
Expects(_audioId.playId() != 0);
}
int AudioTrack::streamIndex() const {
// Thread-safe, because _stream.index is immutable.
return _stream.index;
}
AVRational AudioTrack::streamTimeBase() const {
return _stream.timeBase;
}
void AudioTrack::process(Packet &&packet) {
_noMoreData = packet.empty();
if (initialized()) {
mixerEnqueue(std::move(packet));
} else if (!tryReadFirstFrame(std::move(packet))) {
_error();
}
}
bool AudioTrack::initialized() const {
return !_ready;
}
bool AudioTrack::tryReadFirstFrame(Packet &&packet) {
// #TODO streaming fix seek to the end.
if (ProcessPacket(_stream, std::move(packet)).failed()) {
return false;
}
if (const auto error = ReadNextFrame(_stream)) {
if (error.code() == AVERROR_EOF) {
// #TODO streaming fix seek to the end.
return false;
} else if (error.code() != AVERROR(EAGAIN) || _noMoreData) {
return false;
}
return true;
} else if (!fillStateFromFrame()) {
return false;
}
mixerInit();
callReady();
return true;
}
bool AudioTrack::fillStateFromFrame() {
_startedPosition = FramePosition(_stream);
return (_startedPosition != kTimeUnknown);
}
void AudioTrack::mixerInit() {
Expects(!initialized());
auto data = std::make_unique<VideoSoundData>();
data->frame = _stream.frame.release();
data->context = _stream.codec.release();
data->frequency = _stream.frequency;
data->length = (_stream.duration * data->frequency) / 1000LL;
data->speed = _options.speed;
Media::Player::mixer()->play(
_audioId,
std::move(data),
_startedPosition);
}
void AudioTrack::callReady() {
Expects(_ready != nullptr);
auto data = AudioInformation();
data.state.duration = _stream.duration;
data.state.position = _startedPosition;
data.state.receivedTill = _noMoreData
? _stream.duration
: _startedPosition;
base::take(_ready)({ VideoInformation(), data });
}
void AudioTrack::mixerEnqueue(Packet &&packet) {
Media::Player::mixer()->feedFromVideo({
&packet.fields(),
_audioId
});
packet.release();
}
void AudioTrack::start(crl::time startTime) {
Expects(initialized());
// #TODO streaming support start() when paused.
Media::Player::mixer()->resume(_audioId, true);
}
rpl::producer<crl::time> AudioTrack::playPosition() {
Expects(_ready == nullptr);
if (!_subscription) {
_subscription = Media::Player::Updated(
).add_subscription([=](const AudioMsgId &id) {
using State = Media::Player::State;
if (id != _audioId) {
return;
}
const auto type = AudioMsgId::Type::Video;
const auto state = Media::Player::mixer()->currentState(type);
if (state.id != _audioId) {
// #TODO streaming muted by other
return;
} else switch (state.state) {
case State::Stopped:
case State::StoppedAtEnd:
case State::PausedAtEnd:
_playPosition.reset();
return;
case State::StoppedAtError:
case State::StoppedAtStart:
_error();
return;
case State::Starting:
case State::Playing:
case State::Stopping:
case State::Pausing:
case State::Resuming:
_playPosition = state.position * 1000 / state.frequency;
return;
case State::Paused:
return;
}
});
}
return _playPosition.value();
}
AudioTrack::~AudioTrack() {
if (_audioId.playId()) {
Media::Player::mixer()->stop(_audioId);
}
}
} // namespace Streaming
} // namespace Media