audio_core: Add initial code for keeping track of audout state.

src/audio_core/audio_out.cpp

@@ -0,0 +1,50 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "audio_core/audio_out.h"
+#include "common/assert.h"
+#include "common/logging/log.h"
+
+namespace AudioCore {
+
+/// Returns the stream format from the specified number of channels
+static Stream::Format ChannelsToStreamFormat(int num_channels) {
+    switch (num_channels) {
+    case 1:
+        return Stream::Format::Mono16;
+    case 2:
+        return Stream::Format::Stereo16;
+    case 6:
+        return Stream::Format::Multi51Channel16;
+    }
+
+    LOG_CRITICAL(Audio, "Unimplemented num_channels={}", num_channels);
+    UNREACHABLE();
+    return {};
+}
+
+StreamPtr AudioOut::OpenStream(int sample_rate, int num_channels,
+                               Stream::ReleaseCallback&& release_callback) {
+    streams.push_back(std::make_shared<Stream>(sample_rate, ChannelsToStreamFormat(num_channels),
+                                               std::move(release_callback)));
+    return streams.back();
+}
+
+std::vector<u64> AudioOut::GetTagsAndReleaseBuffers(StreamPtr stream, size_t max_count) {
+    return stream->GetTagsAndReleaseBuffers(max_count);
+}
+
+void AudioOut::StartStream(StreamPtr stream) {
+    stream->Play();
+}
+
+void AudioOut::StopStream(StreamPtr stream) {
+    stream->Stop();
+}
+
+bool AudioOut::QueueBuffer(StreamPtr stream, Buffer::Tag tag, std::vector<u8>&& data) {
+    return stream->QueueBuffer(std::make_shared<Buffer>(tag, std::move(data)));
+}
+
+} // namespace AudioCore