Project Andio

1 files changed, 40 insertions, 0 deletions

diff --git a/src/audio_core/renderer/upsampler/upsampler_state.h b/src/audio_core/renderer/upsampler/upsampler_state.h
new file mode 100644
index 000000000..28cebe200
--- /dev/null
+++ b/src/audio_core/renderer/upsampler/upsampler_state.h
@@ -0,0 +1,40 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <array>
+
+#include "common/common_types.h"
+#include "common/fixed_point.h"
+
+namespace AudioCore::AudioRenderer {
+/**
+ * Upsampling state used by the AudioRenderer across calls.
+ */
+struct UpsamplerState {
+    static constexpr u16 HistorySize = 20;
+
+    /// Source data to target data ratio. E.g 48'000/32'000 = 1.5
+    Common::FixedPoint<16, 16> ratio;
+    /// Sample history
+    std::array<Common::FixedPoint<24, 8>, HistorySize> history;
+    /// Size of the sinc coefficient window
+    u16 window_size;
+    /// Read index for the history
+    u16 history_output_index;
+    /// Write index for the history
+    u16 history_input_index;
+    /// Start offset within the history, fixed to 0
+    u16 history_start_index;
+    /// Ebd offset within the history, fixed to HistorySize
+    u16 history_end_index;
+    /// Is this state initialized?
+    bool initialized;
+    /// Index of the current sample.
+    /// E.g 16K -> 48K has a ratio of 3, so this will be 0-2.
+    /// See the Upsample command in the AudioRenderer for more information.
+    u8 sample_index;
+};
+
+} // namespace AudioCore::AudioRenderer