AudioServer: removed AS prefix from class and file names

And moved everything to AudioServer namespace

Services/AudioServer/Mixer.cpp

@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/BufferStream.h>
+#include <AK/NumericLimits.h>
+#include <AudioServer/ClientConnection.h>
+#include <AudioServer/Mixer.h>
+#include <pthread.h>
+
+namespace AudioServer {
+
+Mixer::Mixer()
+    : m_device(Core::File::construct("/dev/audio", this))
+    , m_sound_thread(
+          [this] {
+              mix();
+              return 0;
+          },
+          "AudioServer[mixer]")
+{
+    if (!m_device->open(Core::IODevice::WriteOnly)) {
+        dbgprintf("Can't open audio device: %s\n", 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(*new BufferQueue(client));
+    pthread_mutex_lock(&m_pending_mutex);
+    m_pending_mixing.append(*queue);
+    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()) {
+            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);
+        }
+
+        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));
+
+        // 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::Sample sample;
+                if (!queue->get_next_sample(sample))
+                    break;
+                mixed_sample += sample;
+            }
+        }
+
+        bool muted = m_muted;
+
+        // output the mixed stuff to the device
+        u8 raw_buffer[4096];
+        auto buffer = ByteBuffer::wrap(muted ? m_zero_filled_buffer : raw_buffer, sizeof(raw_buffer));
+
+        BufferStream stream(buffer);
+        if (!muted) {
+            for (int i = 0; i < mixed_buffer_length; ++i) {
+                auto& mixed_sample = mixed_buffer[i];
+
+                mixed_sample.scale(m_main_volume);
+                mixed_sample.clip();
+
+                i16 out_sample;
+                out_sample = mixed_sample.left * NumericLimits<i16>::max();
+                stream << out_sample;
+
+                ASSERT(!stream.at_end()); // we should have enough space for both channels in one buffer!
+                out_sample = mixed_sample.right * NumericLimits<i16>::max();
+                stream << out_sample;
+            }
+        }
+
+        if (stream.offset() != 0) {
+            buffer.trim(stream.offset());
+        }
+        m_device->write(buffer);
+    }
+}
+
+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.make_weak_ptr())
+{
+}
+
+void BufferQueue::enqueue(NonnullRefPtr<Audio::Buffer>&& buffer)
+{
+    m_remaining_samples += buffer->sample_count();
+    m_queue.enqueue(move(buffer));
+}
+}