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Ladybird+LibWeb+WebConent: Drive audio in Ladybird off the main thread

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The main thread in the WebContent process is often busy with layout and
running JavaScript. This can cause audio to sound jittery and crack. To
avoid this behavior, we now drive audio on a secondary thread.

Note: Browser on Serenity uses AudioServer, the connection for which is
already handled on a secondary thread within LibAudio. So this only
applies to Lagom.

Rather than using LibThreading, our hands are tied to QThread for now.
Internally, the Qt media objects use a QTimer, which is forbidden from
running on a thread that is not a QThread (the debug console is spammed
with messages pointing this out). Ideally, in the future AudioServer
will be able to run for non-Serenity platforms, and most of this can be
aligned with the Serenity implementation.
This commit is contained in:
Timothy Flynn 2023-06-20 12:43:04 -04:00 • committed by Andreas Kling
parent 0fd35b4dd8
commit 1c4dd0caad
10 changed files with 383 additions and 205 deletions
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89
Userland/Libraries/LibWeb/HTML/AudioTrack.cpp
View file

@ -5,10 +5,7 @@
*/
#include <AK/IDAllocator.h>
#include <AK/Time.h>
#include <LibAudio/Loader.h>
#include <LibAudio/Resampler.h>
#include <LibAudio/Sample.h>
#include <LibJS/Runtime/Realm.h>
#include <LibJS/Runtime/VM.h>
#include <LibWeb/Bindings/AudioTrackPrototype.h>
@ -20,25 +17,23 @@
#include <LibWeb/HTML/HTMLMediaElement.h>
#include <LibWeb/Layout/Node.h>
#include <LibWeb/Platform/AudioCodecPlugin.h>
#include <LibWeb/Platform/Timer.h>
namespace Web::HTML {
static IDAllocator s_audio_track_id_allocator;
// Number of milliseconds of audio data contained in each audio buffer
static constexpr u32 BUFFER_SIZE_MS = 50;
AudioTrack::AudioTrack(JS::Realm& realm, JS::NonnullGCPtr<HTMLMediaElement> media_element, NonnullRefPtr<Audio::Loader> loader)
: PlatformObject(realm)
, m_media_element(media_element)
, m_audio_plugin(Platform::AudioCodecPlugin::create().release_value_but_fixme_should_propagate_errors())
, m_loader(move(loader))
, m_sample_timer(Platform::Timer::create_repeating(BUFFER_SIZE_MS, [this]() {
play_next_samples();
}))
, m_audio_plugin(Platform::AudioCodecPlugin::create(move(loader)).release_value_but_fixme_should_propagate_errors())
{
m_audio_plugin->device_sample_rate();
m_audio_plugin->on_playback_position_updated = [this](auto position) {
if (auto* layout_node = m_media_element->layout_node())
layout_node->set_needs_display();
auto playback_position = static_cast<double>(position.to_milliseconds()) / 1000.0;
m_media_element->set_current_playback_position(playback_position);
};
}
AudioTrack::~AudioTrack()
@ -63,30 +58,16 @@ JS::ThrowCompletionOr<void> AudioTrack::initialize(JS::Realm& realm)
void AudioTrack::play(Badge<HTMLAudioElement>)
{
m_audio_plugin->resume_playback();
m_sample_timer->start();
}
void AudioTrack::pause(Badge<HTMLAudioElement>)
{
m_audio_plugin->pause_playback();
m_sample_timer->stop();
}
Duration AudioTrack::position() const
Duration AudioTrack::duration()
{
auto samples_played = static_cast<double>(m_loader->loaded_samples());
auto sample_rate = static_cast<double>(m_loader->sample_rate());
auto source_to_device_ratio = sample_rate / static_cast<double>(m_audio_plugin->device_sample_rate());
samples_played *= source_to_device_ratio;
return Duration::from_milliseconds(static_cast<i64>(samples_played / sample_rate * 1000.0));
}
Duration AudioTrack::duration() const
{
auto duration = static_cast<double>(m_loader->total_samples()) / static_cast<double>(m_loader->sample_rate());
return Duration::from_milliseconds(static_cast<i64>(duration * 1000.0));
return m_audio_plugin->duration();
}
void AudioTrack::seek(double position, MediaSeekMode seek_mode)
@ -94,11 +75,7 @@ void AudioTrack::seek(double position, MediaSeekMode seek_mode)
// FIXME: Implement seeking mode.
(void)seek_mode;
auto duration = static_cast<double>(this->duration().to_milliseconds()) / 1000.0;
position = position / duration * static_cast<double>(m_loader->total_samples());
m_loader->seek(position).release_value_but_fixme_should_propagate_errors();
m_media_element->set_current_playback_position(this->position().to_milliseconds() / 1000.0);
m_audio_plugin->seek(position);
}
void AudioTrack::update_volume()
@ -134,48 +111,4 @@ void AudioTrack::set_enabled(bool enabled)
m_enabled = enabled;
}
Optional<FixedArray<Audio::Sample>> AudioTrack::get_next_samples()
{
bool all_samples_loaded = m_loader->loaded_samples() >= m_loader->total_samples();
bool audio_server_done = m_audio_plugin->remaining_samples() == 0;
if (all_samples_loaded && audio_server_done)
return {};
auto samples_to_load_per_buffer = static_cast<size_t>(BUFFER_SIZE_MS / 1000.0f * static_cast<float>(m_loader->sample_rate()));
auto buffer_or_error = m_loader->get_more_samples(samples_to_load_per_buffer);
if (buffer_or_error.is_error()) {
dbgln("Error while loading samples: {}", buffer_or_error.error().description);
return {};
}
return buffer_or_error.release_value();
}
void AudioTrack::play_next_samples()
{
if (auto* layout_node = m_media_element->layout_node())
layout_node->set_needs_display();
auto samples = get_next_samples();
if (!samples.has_value()) {
m_audio_plugin->playback_ended();
(void)m_loader->reset();
auto playback_position = static_cast<double>(duration().to_milliseconds()) / 1000.0;
m_media_element->set_current_playback_position(playback_position);
return;
}
Audio::ResampleHelper<Audio::Sample> resampler(m_loader->sample_rate(), m_audio_plugin->device_sample_rate());
auto resampled = FixedArray<Audio::Sample>::create(resampler.resample(samples.release_value()).span()).release_value_but_fixme_should_propagate_errors();
m_audio_plugin->enqueue_samples(move(resampled));
auto playback_position = static_cast<double>(position().to_milliseconds()) / 1000.0;
m_media_element->set_current_playback_position(playback_position);
}
}