tdesktop/Telegram/SourceFiles/media/audio/media_audio_track.cpp

342 lines
8.4 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/audio/media_audio_track.h"
#include "media/audio/media_audio_ffmpeg_loader.h"
#include "media/audio/media_audio.h"
#include "core/application.h"
#include "core/file_location.h"
#include <al.h>
#include <alc.h>
namespace Media {
namespace Audio {
namespace {
constexpr auto kMaxFileSize = 10 * 1024 * 1024;
constexpr auto kDetachDeviceTimeout = crl::time(500); // destroy the audio device after 500ms of silence
constexpr auto kTrackUpdateTimeout = crl::time(100);
ALuint CreateSource() {
auto source = ALuint(0);
alGenSources(1, &source);
alSourcef(source, AL_PITCH, 1.f);
alSourcef(source, AL_GAIN, 1.f);
alSource3f(source, AL_POSITION, 0, 0, 0);
alSource3f(source, AL_VELOCITY, 0, 0, 0);
return source;
}
ALuint CreateBuffer() {
auto buffer = ALuint(0);
alGenBuffers(1, &buffer);
return buffer;
}
} // namespace
Track::Track(not_null<Instance*> instance) : _instance(instance) {
_instance->registerTrack(this);
}
void Track::samplePeakEach(crl::time peakDuration) {
_peakDurationMs = peakDuration;
}
void Track::fillFromData(bytes::vector &&data) {
FFMpegLoader loader(Core::FileLocation(), QByteArray(), std::move(data));
auto position = qint64(0);
if (!loader.open(position)) {
_failed = true;
return;
}
auto format = loader.format();
_peakEachPosition = _peakDurationMs ? ((loader.samplesFrequency() * _peakDurationMs) / 1000) : 0;
const auto samplesCount = (loader.duration() * loader.samplesFrequency()) / 1000;
const auto peaksCount = _peakEachPosition ? (samplesCount / _peakEachPosition) : 0;
_peaks.reserve(peaksCount);
auto peakValue = uint16(0);
auto peakSamples = 0;
auto peakEachSample = (format == AL_FORMAT_STEREO8 || format == AL_FORMAT_STEREO16) ? (_peakEachPosition * 2) : _peakEachPosition;
_peakValueMin = 0x7FFF;
_peakValueMax = 0;
auto peakCallback = [this, &peakValue, &peakSamples, peakEachSample](uint16 sample) {
accumulate_max(peakValue, sample);
if (++peakSamples >= peakEachSample) {
peakSamples -= peakEachSample;
_peaks.push_back(peakValue);
accumulate_max(_peakValueMax, peakValue);
accumulate_min(_peakValueMin, peakValue);
peakValue = 0;
}
};
do {
using Error = AudioPlayerLoader::ReadError;
const auto result = loader.readMore();
Assert(result != Error::Wait && result != Error::RetryNotQueued);
if (result == Error::Retry) {
continue;
} else if (result == Error::EndOfFile) {
break;
} else if (result == Error::Other || result == Error::Wait) {
_failed = true;
break;
}
Assert(v::is<bytes::const_span>(result));
const auto sampleBytes = v::get<bytes::const_span>(result);
Assert(!sampleBytes.empty());
_samplesCount += sampleBytes.size() / loader.sampleSize();
_samples.insert(_samples.end(), sampleBytes.data(), sampleBytes.data() + sampleBytes.size());
if (peaksCount) {
if (format == AL_FORMAT_MONO8 || format == AL_FORMAT_STEREO8) {
Media::Audio::IterateSamples<uchar>(sampleBytes, peakCallback);
} else if (format == AL_FORMAT_MONO16 || format == AL_FORMAT_STEREO16) {
Media::Audio::IterateSamples<int16>(sampleBytes, peakCallback);
}
}
} while (true);
_alFormat = loader.format();
_sampleRate = loader.samplesFrequency();
_lengthMs = loader.duration();
}
void Track::fillFromFile(const Core::FileLocation &location) {
if (location.accessEnable()) {
fillFromFile(location.name());
location.accessDisable();
} else {
LOG(("Track Error: Could not enable access to file '%1'.").arg(location.name()));
_failed = true;
}
}
void Track::fillFromFile(const QString &filePath) {
QFile f(filePath);
if (f.open(QIODevice::ReadOnly)) {
auto size = f.size();
if (size > 0 && size <= kMaxFileSize) {
auto bytes = bytes::vector(size);
if (f.read(reinterpret_cast<char*>(bytes.data()), bytes.size()) == bytes.size()) {
fillFromData(std::move(bytes));
} else {
LOG(("Track Error: Could not read %1 bytes from file '%2'.").arg(bytes.size()).arg(filePath));
_failed = true;
}
} else {
LOG(("Track Error: Bad file '%1' size: %2.").arg(filePath).arg(size));
_failed = true;
}
} else {
LOG(("Track Error: Could not open file '%1'.").arg(filePath));
_failed = true;
}
}
void Track::playWithLooping(bool looping) {
_active = true;
if (failed() || _samples.empty()) {
finish();
return;
}
ensureSourceCreated();
alSourceStop(_alSource);
_looping = looping;
alSourcei(_alSource, AL_LOOPING, _looping ? 1 : 0);
alSourcef(_alSource, AL_GAIN, _volume);
alSourcePlay(_alSource);
_instance->trackStarted(this);
}
void Track::finish() {
if (_active) {
_active = false;
_instance->trackFinished(this);
}
_alPosition = 0;
}
void Track::ensureSourceCreated() {
if (alIsSource(_alSource)) {
return;
}
{
QMutexLocker lock(Player::internal::audioPlayerMutex());
if (!AttachToDevice()) {
_failed = true;
return;
}
}
_alSource = CreateSource();
_alBuffer = CreateBuffer();
alBufferData(_alBuffer, _alFormat, _samples.data(), _samples.size(), _sampleRate);
alSourcei(_alSource, AL_BUFFER, _alBuffer);
}
void Track::updateState() {
if (!isActive() || !alIsSource(_alSource)) {
return;
}
_stateUpdatedAt = crl::now();
auto state = ALint(0);
alGetSourcei(_alSource, AL_SOURCE_STATE, &state);
if (state != AL_PLAYING) {
finish();
} else {
auto currentPosition = ALint(0);
alGetSourcei(_alSource, AL_SAMPLE_OFFSET, &currentPosition);
_alPosition = currentPosition;
}
}
float64 Track::getPeakValue(crl::time when) const {
if (!isActive() || !_samplesCount || _peaks.empty() || _peakValueMin == _peakValueMax) {
return 0.;
}
auto sampleIndex = (_alPosition + ((when - _stateUpdatedAt) * _sampleRate / 1000));
while (sampleIndex < 0) {
sampleIndex += _samplesCount;
}
sampleIndex = sampleIndex % _samplesCount;
auto peakIndex = (sampleIndex / _peakEachPosition) % _peaks.size();
return (_peaks[peakIndex] - _peakValueMin) / float64(_peakValueMax - _peakValueMin);
}
void Track::detachFromDevice() {
if (alIsSource(_alSource)) {
updateState();
alSourceStop(_alSource);
alSourcei(_alSource, AL_BUFFER, AL_NONE);
alDeleteBuffers(1, &_alBuffer);
alDeleteSources(1, &_alSource);
}
_alBuffer = 0;
_alSource = 0;
}
void Track::reattachToDevice() {
if (!isActive() || alIsSource(_alSource)) {
return;
}
ensureSourceCreated();
alSourcei(_alSource, AL_LOOPING, _looping ? 1 : 0);
alSourcei(_alSource, AL_SAMPLE_OFFSET, static_cast<ALint>(_alPosition));
alSourcePlay(_alSource);
}
Track::~Track() {
detachFromDevice();
_instance->unregisterTrack(this);
}
Instance::Instance() {
_updateTimer.setCallback([this] {
auto hasActive = false;
for (auto track : _tracks) {
track->updateState();
if (track->isActive()) {
hasActive = true;
}
}
if (hasActive) {
Audio::StopDetachIfNotUsedSafe();
}
});
_detachFromDeviceTimer.setCallback([=] {
_detachFromDeviceForce = false;
Player::internal::DetachFromDevice(this);
});
}
std::unique_ptr<Track> Instance::createTrack() {
return std::make_unique<Track>(this);
}
Instance::~Instance() {
Expects(_tracks.empty());
}
void Instance::registerTrack(Track *track) {
_tracks.insert(track);
}
void Instance::unregisterTrack(Track *track) {
_tracks.erase(track);
}
void Instance::trackStarted(Track *track) {
stopDetachIfNotUsed();
if (!_updateTimer.isActive()) {
_updateTimer.callEach(kTrackUpdateTimeout);
}
}
void Instance::trackFinished(Track *track) {
if (!hasActiveTracks()) {
_updateTimer.cancel();
scheduleDetachIfNotUsed();
}
}
void Instance::detachTracks() {
for (auto track : _tracks) {
track->detachFromDevice();
}
}
void Instance::reattachTracks() {
if (!IsAttachedToDevice()) {
return;
}
for (auto track : _tracks) {
track->reattachToDevice();
}
}
bool Instance::hasActiveTracks() const {
for (auto track : _tracks) {
if (track->isActive()) {
return true;
}
}
return false;
}
void Instance::scheduleDetachFromDevice() {
_detachFromDeviceForce = true;
scheduleDetachIfNotUsed();
}
void Instance::scheduleDetachIfNotUsed() {
if (!_detachFromDeviceTimer.isActive()) {
_detachFromDeviceTimer.callOnce(kDetachDeviceTimeout);
}
}
void Instance::stopDetachIfNotUsed() {
if (!_detachFromDeviceForce) {
_detachFromDeviceTimer.cancel();
}
}
Instance &Current() {
return Core::App().audio();
}
} // namespace Audio
} // namespace Media