LibMedia: Absorb LibAudio

LibMedia will be responsible for both audio and video decoding.

Tests/LibMedia/TestPlaybackStream.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2023, Gregory Bertilson <zaggy1024@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Math.h>
+#include <AK/MemoryStream.h>
+#include <AK/WeakPtr.h>
+#include <LibCore/EventLoop.h>
+#include <LibMedia/Audio/PlaybackStream.h>
+#include <LibTest/TestSuite.h>
+#include <unistd.h>
+
+#if defined(HAVE_PULSEAUDIO)
+#    include <LibMedia/Audio/PulseAudioWrappers.h>
+#endif
+
+// FIXME: CI doesn't run an AudioServer currently. Creating one in /etc/SystemServer.ini does not
+//        allow this test to pass since CI runs in a Shell that will setsid() if it finds that the
+//        current session ID is 0, and AudioServer's socket address depends on the current sid.
+//        If we can fix that, this test can run on CI.
+//        https://github.com/SerenityOS/serenity/issues/20538
+#define STREAM_TEST TEST_CASE
+
+STREAM_TEST(create_and_destroy_playback_stream)
+{
+    Core::EventLoop event_loop;
+
+    bool has_implementation = false;
+#if defined(HAVE_PULSEAUDIO) || defined(AK_OS_MACOS)
+    has_implementation = true;
+#endif
+
+    {
+        auto stream_result = Audio::PlaybackStream::create(Audio::OutputState::Playing, 44100, 2, 100, [](Bytes buffer, Audio::PcmSampleFormat format, size_t sample_count) -> ReadonlyBytes {
+            VERIFY(format == Audio::PcmSampleFormat::Float32);
+            FixedMemoryStream writing_stream { buffer };
+
+            for (size_t i = 0; i < sample_count; i++) {
+                MUST(writing_stream.write_value(0.0f));
+                MUST(writing_stream.write_value(0.0f));
+            }
+
+            return buffer.trim(writing_stream.offset());
+        });
+        EXPECT_EQ(!stream_result.is_error(), has_implementation);
+        usleep(10000);
+    }
+
+#if defined(HAVE_PULSEAUDIO)
+    VERIFY(!Audio::PulseAudioContext::weak_instance());
+#endif
+}