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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, kleines Filmröllchen <filmroellchen@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Mixer.h"
#include "AK/Format.h"
#include <AK/Array.h>
#include <AK/MemoryStream.h>
#include <AK/NumericLimits.h>
#include <AudioServer/ConnectionFromClient.h>
#include <AudioServer/Mixer.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/Timer.h>
#include <pthread.h>
#include <stdlib.h>
#include <sys/ioctl.h>
namespace AudioServer {
u8 Mixer::m_zero_filled_buffer[4096];
Mixer::Mixer(NonnullRefPtr<Core::ConfigFile> config)
// FIXME: Allow AudioServer to use other audio channels as well
: m_device(Core::File::construct("/dev/audio/0", this))
, m_sound_thread(Threading::Thread::construct(
[this] {
mix();
return 0;
},
"AudioServer[mixer]"))
, m_config(move(config))
{
if (!m_device->open(Core::OpenMode::WriteOnly)) {
dbgln("Can't open audio device: {}", m_device->error_string());
return;
}
m_muted = m_config->read_bool_entry("Master", "Mute", false);
m_main_volume = static_cast<double>(m_config->read_num_entry("Master", "Volume", 100)) / 100.0;
m_sound_thread->start();
}
Mixer::~Mixer()
{
}
NonnullRefPtr<ClientAudioStream> Mixer::create_queue(ConnectionFromClient& client)
{
auto queue = adopt_ref(*new ClientAudioStream(client));
m_pending_mutex.lock();
m_pending_mixing.append(*queue);
m_pending_mutex.unlock();
// Signal the mixer thread to start back up, in case nobody was connected before.
m_mixing_necessary.signal();
return queue;
}
void Mixer::mix()
{
decltype(m_pending_mixing) active_mix_queues;
for (;;) {
m_pending_mutex.lock();
// While we have nothing to mix, wait on the condition.
m_mixing_necessary.wait_while([this, &active_mix_queues]() { return m_pending_mixing.is_empty() && active_mix_queues.is_empty(); });
if (!m_pending_mixing.is_empty()) {
active_mix_queues.extend(move(m_pending_mixing));
m_pending_mixing.clear();
}
m_pending_mutex.unlock();
active_mix_queues.remove_all_matching([&](auto& entry) { return !entry->client(); });
Audio::Sample mixed_buffer[1024];
auto mixed_buffer_length = (int)(sizeof(mixed_buffer) / sizeof(Audio::Sample));
m_main_volume.advance_time();
int active_queues = 0;
// Mix the buffers together into the output
for (auto& queue : active_mix_queues) {
if (!queue->client()) {
queue->clear();
continue;
}
++active_queues;
queue->volume().advance_time();
for (int i = 0; i < mixed_buffer_length; ++i) {
auto& mixed_sample = mixed_buffer[i];
Audio::Sample sample;
if (!queue->get_next_sample(sample))
break;
if (queue->is_muted())
continue;
sample.log_multiply(SAMPLE_HEADROOM);
sample.log_multiply(queue->volume());
mixed_sample += sample;
}
}
if (m_muted) {
m_device->write(m_zero_filled_buffer, sizeof(m_zero_filled_buffer));
} else {
Array<u8, 4096> buffer;
OutputMemoryStream stream { buffer };
for (int i = 0; i < mixed_buffer_length; ++i) {
auto& mixed_sample = mixed_buffer[i];
// Even though it's not realistic, the user expects no sound at 0%.
if (m_main_volume < 0.01)
mixed_sample = Audio::Sample { 0 };
else
mixed_sample.log_multiply(m_main_volume);
mixed_sample.clip();
LittleEndian<i16> out_sample;
out_sample = mixed_sample.left * NumericLimits<i16>::max();
stream << out_sample;
out_sample = mixed_sample.right * NumericLimits<i16>::max();
stream << out_sample;
}
VERIFY(stream.is_end());
VERIFY(!stream.has_any_error());
m_device->write(stream.data(), stream.size());
}
}
}
void Mixer::set_main_volume(double volume)
{
if (volume < 0)
m_main_volume = 0;
else if (volume > 2)
m_main_volume = 2;
else
m_main_volume = volume;
m_config->write_num_entry("Master", "Volume", static_cast<int>(volume * 100));
request_setting_sync();
ConnectionFromClient::for_each([&](ConnectionFromClient& client) {
client.did_change_main_mix_volume({}, main_volume());
});
}
void Mixer::set_muted(bool muted)
{
if (m_muted == muted)
return;
m_muted = muted;
m_config->write_bool_entry("Master", "Mute", m_muted);
request_setting_sync();
ConnectionFromClient::for_each([muted](ConnectionFromClient& client) {
client.did_change_main_mix_muted_state({}, muted);
});
}
int Mixer::audiodevice_set_sample_rate(u32 sample_rate)
{
int code = ioctl(m_device->fd(), SOUNDCARD_IOCTL_SET_SAMPLE_RATE, sample_rate);
if (code != 0)
dbgln("Error while setting sample rate to {}: ioctl error: {}", sample_rate, strerror(errno));
return code;
}
u32 Mixer::audiodevice_get_sample_rate() const
{
u32 sample_rate = 0;
int code = ioctl(m_device->fd(), SOUNDCARD_IOCTL_GET_SAMPLE_RATE, &sample_rate);
if (code != 0)
dbgln("Error while getting sample rate: ioctl error: {}", strerror(errno));
return sample_rate;
}
void Mixer::request_setting_sync()
{
if (m_config_write_timer.is_null() || !m_config_write_timer->is_active()) {
m_config_write_timer = Core::Timer::create_single_shot(
AUDIO_CONFIG_WRITE_INTERVAL,
[this] {
if (auto result = m_config->sync(); result.is_error())
dbgln("Failed to write audio mixer config: {}", result.error());
},
this);
m_config_write_timer->start();
}
}
ClientAudioStream::ClientAudioStream(ConnectionFromClient& client)
: m_client(client)
{
}
void ClientAudioStream::enqueue(NonnullRefPtr<Audio::Buffer>&& buffer)
{
m_remaining_samples += buffer->sample_count();
m_queue.enqueue(move(buffer));
}
}
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