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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "PlaybackManager.h"
PlaybackManager::PlaybackManager(NonnullRefPtr<Audio::ConnectionFromClient> connection)
: m_connection(connection)
{
m_timer = Core::Timer::construct(PlaybackManager::update_rate_ms, [&]() {
if (!m_loader)
return;
// Make sure that we have some buffers queued up at all times: an audio dropout is the last thing we want.
if (m_enqueued_buffers.size() < always_enqueued_buffer_count)
next_buffer();
});
m_connection->on_finish_playing_buffer = [this](auto finished_buffer) {
auto last_buffer_in_queue = m_enqueued_buffers.dequeue();
// A fail here would mean that the server skipped one of our buffers, which is BAD.
VERIFY(last_buffer_in_queue == finished_buffer);
next_buffer();
};
m_timer->stop();
m_device_sample_rate = connection->get_sample_rate();
}
void PlaybackManager::set_loader(NonnullRefPtr<Audio::Loader>&& loader)
{
stop();
m_loader = loader;
if (m_loader) {
m_total_length = m_loader->total_samples() / static_cast<float>(m_loader->sample_rate());
m_device_samples_per_buffer = PlaybackManager::buffer_size_ms / 1000.0f * m_device_sample_rate;
u32 source_samples_per_buffer = PlaybackManager::buffer_size_ms / 1000.0f * m_loader->sample_rate();
m_source_buffer_size_bytes = source_samples_per_buffer * m_loader->num_channels() * m_loader->bits_per_sample() / 8;
m_resampler = Audio::ResampleHelper<double>(m_loader->sample_rate(), m_device_sample_rate);
m_timer->start();
} else {
m_timer->stop();
}
}
void PlaybackManager::stop()
{
set_paused(true);
m_connection->clear_buffer(true);
m_last_seek = 0;
m_current_buffer = nullptr;
if (m_loader)
(void)m_loader->reset();
}
void PlaybackManager::play()
{
set_paused(false);
}
void PlaybackManager::loop(bool loop)
{
m_loop = loop;
}
void PlaybackManager::seek(const int position)
{
if (!m_loader)
return;
m_last_seek = position;
bool paused_state = m_paused;
set_paused(true);
m_connection->clear_buffer(true);
m_current_buffer = nullptr;
[[maybe_unused]] auto result = m_loader->seek(position);
if (!paused_state)
set_paused(false);
}
void PlaybackManager::pause()
{
set_paused(true);
}
void PlaybackManager::set_paused(bool paused)
{
m_paused = paused;
m_connection->set_paused(paused);
}
bool PlaybackManager::toggle_pause()
{
if (m_paused) {
play();
} else {
pause();
}
return m_paused;
}
void PlaybackManager::next_buffer()
{
if (on_update)
on_update();
if (m_paused)
return;
u32 audio_server_remaining_samples = m_connection->get_remaining_samples();
bool all_samples_loaded = (m_loader->loaded_samples() >= m_loader->total_samples());
bool audio_server_done = (audio_server_remaining_samples == 0);
if (all_samples_loaded && audio_server_done) {
stop();
if (on_finished_playing)
on_finished_playing();
return;
}
if (audio_server_remaining_samples < m_device_samples_per_buffer * always_enqueued_buffer_count) {
auto maybe_buffer = m_loader->get_more_samples(m_source_buffer_size_bytes);
if (!maybe_buffer.is_error()) {
m_current_buffer = maybe_buffer.release_value();
VERIFY(m_resampler.has_value());
m_resampler->reset();
// FIXME: Handle OOM better.
m_current_buffer = MUST(Audio::resample_buffer(m_resampler.value(), *m_current_buffer));
m_connection->enqueue(*m_current_buffer);
m_enqueued_buffers.enqueue(m_current_buffer->id());
}
}
}
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