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+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <queue>
+#include <vector>
+
+#include "audio_core/codec.h"
+#include "audio_core/hle/common.h"
+#include "audio_core/hle/dsp.h"
+#include "audio_core/hle/filter.h"
+#include "audio_core/interpolate.h"
+
+#include "common/common_types.h"
+
+namespace DSP {
+namespace HLE {
+
+/**
+ * This module performs:
+ * - Buffer management
+ * - Decoding of buffers
+ * - Buffer resampling and interpolation
+ * - Per-source filtering (SimpleFilter, BiquadFilter)
+ * - Per-source gain
+ * - Other per-source processing
+ */
+class Source final {
+public:
+ explicit Source(size_t source_id_) : source_id(source_id_) {
+ Reset();
+ }
+
+ /// Resets internal state.
+ void Reset();
+
+ /**
+ * This is called once every audio frame. This performs per-source processing every frame.
+ * @param config The new configuration we've got for this Source from the application.
+ * @param adpcm_coeffs ADPCM coefficients to use if config tells us to use them (may contain invalid values otherwise).
+ * @return The current status of this Source. This is given back to the emulated application via SharedMemory.
+ */
+ SourceStatus::Status Tick(SourceConfiguration::Configuration& config, const s16_le (&adpcm_coeffs)[16]);
+
+ /**
+ * Mix this source's output into dest, using the gains for the `intermediate_mix_id`-th intermediate mixer.
+ * @param dest The QuadFrame32 to mix into.
+ * @param intermediate_mix_id The id of the intermediate mix whose gains we are using.
+ */
+ void MixInto(QuadFrame32& dest, size_t intermediate_mix_id) const;
+
+private:
+ const size_t source_id;
+ StereoFrame16 current_frame;
+
+ using Format = SourceConfiguration::Configuration::Format;
+ using InterpolationMode = SourceConfiguration::Configuration::InterpolationMode;
+ using MonoOrStereo = SourceConfiguration::Configuration::MonoOrStereo;
+
+ /// Internal representation of a buffer for our buffer queue
+ struct Buffer {
+ PAddr physical_address;
+ u32 length;
+ u8 adpcm_ps;
+ std::array<u16, 2> adpcm_yn;
+ bool adpcm_dirty;
+ bool is_looping;
+ u16 buffer_id;
+
+ MonoOrStereo mono_or_stereo;
+ Format format;
+
+ bool from_queue;
+ };
+
+ struct BufferOrder {
+ bool operator() (const Buffer& a, const Buffer& b) const {
+ // Lower buffer_id comes first.
+ return a.buffer_id > b.buffer_id;
+ }
+ };
+
+ struct {
+
+ // State variables
+
+ bool enabled = false;
+ u16 sync = 0;
+
+ // Mixing
+
+ std::array<std::array<float, 4>, 3> gain = {};
+
+ // Buffer queue
+
+ std::priority_queue<Buffer, std::vector<Buffer>, BufferOrder> input_queue;
+ MonoOrStereo mono_or_stereo = MonoOrStereo::Mono;
+ Format format = Format::ADPCM;
+
+ // Current buffer
+
+ u32 current_sample_number = 0;
+ u32 next_sample_number = 0;
+ std::vector<std::array<s16, 2>> current_buffer;
+
+ // buffer_id state
+
+ bool buffer_update = false;
+ u32 current_buffer_id = 0;
+
+ // Decoding state
+
+ std::array<s16, 16> adpcm_coeffs = {};
+ Codec::ADPCMState adpcm_state = {};
+
+ // Resampling state
+
+ float rate_multiplier = 1.0;
+ InterpolationMode interpolation_mode = InterpolationMode::Polyphase;
+ AudioInterp::State interp_state = {};
+
+ // Filter state
+
+ SourceFilters filters;
+
+ } state;
+
+ // Internal functions
+
+ /// INTERNAL: Update our internal state based on the current config.
+ void ParseConfig(SourceConfiguration::Configuration& config, const s16_le (&adpcm_coeffs)[16]);
+ /// INTERNAL: Generate the current audio output for this frame based on our internal state.
+ void GenerateFrame();
+ /// INTERNAL: Dequeues a buffer and does preprocessing on it (decoding, resampling). Puts it into current_buffer.
+ bool DequeueBuffer();
+ /// INTERNAL: Generates a SourceStatus::Status based on our internal state.
+ SourceStatus::Status GetCurrentStatus();
+};
+
+} // namespace HLE
+} // namespace DSP