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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/MemoryStream.h>
#include <AK/NumericLimits.h>
#include <AudioServer/ClientConnection.h>
#include <AudioServer/Mixer.h>
#include <pthread.h>
#include <strings.h>
namespace AudioServer {
Mixer::Mixer()
: m_device(Core::File::construct("/dev/audio", this))
, m_sound_thread(LibThread::Thread::construct(
[this] {
mix();
return 0;
},
"AudioServer[mixer]"))
{
if (!m_device->open(Core::IODevice::WriteOnly)) {
dbgln("Can't open audio device: {}", m_device->error_string());
return;
}
pthread_mutex_init(&m_pending_mutex, nullptr);
pthread_cond_init(&m_pending_cond, nullptr);
m_zero_filled_buffer = (u8*)malloc(4096);
bzero(m_zero_filled_buffer, 4096);
m_sound_thread->start();
}
Mixer::~Mixer()
{
}
NonnullRefPtr<BufferQueue> Mixer::create_queue(ClientConnection& client)
{
auto queue = adopt_ref(*new BufferQueue(client));
pthread_mutex_lock(&m_pending_mutex);
m_pending_mixing.append(*queue);
m_added_queue = true;
pthread_cond_signal(&m_pending_cond);
pthread_mutex_unlock(&m_pending_mutex);
return queue;
}
void Mixer::mix()
{
decltype(m_pending_mixing) active_mix_queues;
for (;;) {
if (active_mix_queues.is_empty() || m_added_queue) {
pthread_mutex_lock(&m_pending_mutex);
pthread_cond_wait(&m_pending_cond, &m_pending_mutex);
active_mix_queues.append(move(m_pending_mixing));
pthread_mutex_unlock(&m_pending_mutex);
m_added_queue = false;
}
active_mix_queues.remove_all_matching([&](auto& entry) { return !entry->client(); });
Audio::Frame mixed_buffer[1024];
auto mixed_buffer_length = (int)(sizeof(mixed_buffer) / sizeof(Audio::Frame));
// Mix the buffers together into the output
for (auto& queue : active_mix_queues) {
if (!queue->client()) {
queue->clear();
continue;
}
for (int i = 0; i < mixed_buffer_length; ++i) {
auto& mixed_sample = mixed_buffer[i];
Audio::Frame sample;
if (!queue->get_next_sample(sample))
break;
mixed_sample += sample;
}
}
if (m_muted) {
m_device->write(m_zero_filled_buffer, 4096);
} else {
Array<u8, 4096> buffer;
OutputMemoryStream stream { buffer };
for (int i = 0; i < mixed_buffer_length; ++i) {
auto& mixed_sample = mixed_buffer[i];
mixed_sample.scale(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(int volume)
{
if (volume < 0)
m_main_volume = 0;
else if (volume > 200)
m_main_volume = 200;
else
m_main_volume = volume;
ClientConnection::for_each([&](ClientConnection& client) {
client.did_change_main_mix_volume({}, m_main_volume);
});
}
void Mixer::set_muted(bool muted)
{
if (m_muted == muted)
return;
m_muted = muted;
ClientConnection::for_each([muted](ClientConnection& client) {
client.did_change_muted_state({}, muted);
});
}
BufferQueue::BufferQueue(ClientConnection& client)
: m_client(client)
{
}
void BufferQueue::enqueue(NonnullRefPtr<Audio::Buffer>&& buffer)
{
m_remaining_samples += buffer->sample_count();
m_queue.enqueue(move(buffer));
}
}
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