1 files changed, 73 insertions, 0 deletions
diff --git a/src/audio_core/renderer/command/mix/mix_ramp.h b/src/audio_core/renderer/command/mix/mix_ramp.h
new file mode 100644
index 000000000..770f57e80
--- /dev/null
+++ b/src/audio_core/renderer/command/mix/mix_ramp.h
@@ -0,0 +1,73 @@
+// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <span>
+#include <string>
+
+#include "audio_core/renderer/command/icommand.h"
+#include "common/common_types.h"
+
+namespace AudioCore::AudioRenderer {
+namespace ADSP {
+class CommandListProcessor;
+}
+
+/**
+ * AudioRenderer command for mixing an input mix buffer to an output mix buffer, with a volume
+ * applied to the input, and volume ramping to smooth out the transition.
+ */
+struct MixRampCommand : ICommand {
+    /**
+     * Print this command's information to a string.
+     *
+     * @param processor - The CommandListProcessor processing this command.
+     * @param string    - The string to print into.
+     */
+    void Dump(const ADSP::CommandListProcessor& processor, std::string& string) override;
+
+    /**
+     * Process this command.
+     *
+     * @param processor - The CommandListProcessor processing this command.
+     */
+    void Process(const ADSP::CommandListProcessor& processor) override;
+
+    /**
+     * Verify this command's data is valid.
+     *
+     * @param processor - The CommandListProcessor processing this command.
+     * @return True if the command is valid, otherwise false.
+     */
+    bool Verify(const ADSP::CommandListProcessor& processor) override;
+
+    /// Fixed point precision
+    u8 precision;
+    /// Input mix buffer index
+    s16 input_index;
+    /// Output mix buffer index
+    s16 output_index;
+    /// Previous mix volume
+    f32 prev_volume;
+    /// Current mix volume
+    f32 volume;
+    /// Pointer to the previous sample buffer, used for depopping
+    CpuAddr previous_sample;
+};
+
+/**
+ * Mix input mix buffer into output mix buffer, with volume applied to the input.
+ * @tparam Q           - Number of bits for fixed point operations.
+ * @param output       - Output mix buffer.
+ * @param input        - Input mix buffer.
+ * @param volume       - Volume applied to the input.
+ * @param ramp         - Ramp applied to volume every sample.
+ * @param sample_count - Number of samples to process.
+ * @return The final gained input sample, used for depopping.
+ */
+template <size_t Q>
+s32 ApplyMixRamp(std::span<s32> output, std::span<const s32> input, const f32 volume_,
+                 const f32 ramp_, const u32 sample_count);
+
+} // namespace AudioCore::AudioRenderer