1 files changed, 159 insertions, 0 deletions
diff --git a/src/audio_core/hle/pipe.cpp b/src/audio_core/hle/pipe.cpp
new file mode 100644
index 000000000..9381883b4
--- /dev/null
+++ b/src/audio_core/hle/pipe.cpp
@@ -0,0 +1,159 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <array>
+#include <vector>
+
+#include "audio_core/hle/dsp.h"
+#include "audio_core/hle/pipe.h"
+
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "common/logging/log.h"
+
+namespace DSP {
+namespace HLE {
+
+static DspState dsp_state = DspState::Off;
+
+static std::array<std::vector<u8>, static_cast<size_t>(DspPipe::DspPipe_MAX)> pipe_data;
+
+void ResetPipes() {
+    for (auto& data : pipe_data) {
+        data.clear();
+    }
+    dsp_state = DspState::Off;
+}
+
+std::vector<u8> PipeRead(DspPipe pipe_number, u32 length) {
+    if (pipe_number >= DspPipe::DspPipe_MAX) {
+        LOG_ERROR(Audio_DSP, "pipe_number = %u invalid", pipe_number);
+        return {};
+    }
+
+    std::vector<u8>& data = pipe_data[static_cast<size_t>(pipe_number)];
+
+    if (length > data.size()) {
+        LOG_WARNING(Audio_DSP, "pipe_number = %u is out of data, application requested read of %u but %zu remain",
+                    pipe_number, length, data.size());
+        length = data.size();
+    }
+
+    if (length == 0)
+        return {};
+
+    std::vector<u8> ret(data.begin(), data.begin() + length);
+    data.erase(data.begin(), data.begin() + length);
+    return ret;
+}
+
+size_t GetPipeReadableSize(DspPipe pipe_number) {
+    if (pipe_number >= DspPipe::DspPipe_MAX) {
+        LOG_ERROR(Audio_DSP, "pipe_number = %u invalid", pipe_number);
+        return 0;
+    }
+
+    return pipe_data[static_cast<size_t>(pipe_number)].size();
+}
+
+static void WriteU16(DspPipe pipe_number, u16 value) {
+    std::vector<u8>& data = pipe_data[static_cast<size_t>(pipe_number)];
+    // Little endian
+    data.emplace_back(value & 0xFF);
+    data.emplace_back(value >> 8);
+}
+
+static void AudioPipeWriteStructAddresses() {
+    // These struct addresses are DSP dram addresses.
+    // See also: DSP_DSP::ConvertProcessAddressFromDspDram
+    static const std::array<u16, 15> struct_addresses = {
+        0x8000 + offsetof(SharedMemory, frame_counter) / 2,
+        0x8000 + offsetof(SharedMemory, source_configurations) / 2,
+        0x8000 + offsetof(SharedMemory, source_statuses) / 2,
+        0x8000 + offsetof(SharedMemory, adpcm_coefficients) / 2,
+        0x8000 + offsetof(SharedMemory, dsp_configuration) / 2,
+        0x8000 + offsetof(SharedMemory, dsp_status) / 2,
+        0x8000 + offsetof(SharedMemory, final_samples) / 2,
+        0x8000 + offsetof(SharedMemory, intermediate_mix_samples) / 2,
+        0x8000 + offsetof(SharedMemory, compressor) / 2,
+        0x8000 + offsetof(SharedMemory, dsp_debug) / 2,
+        0x8000 + offsetof(SharedMemory, unknown10) / 2,
+        0x8000 + offsetof(SharedMemory, unknown11) / 2,
+        0x8000 + offsetof(SharedMemory, unknown12) / 2,
+        0x8000 + offsetof(SharedMemory, unknown13) / 2,
+        0x8000 + offsetof(SharedMemory, unknown14) / 2
+    };
+
+    // Begin with a u16 denoting the number of structs.
+    WriteU16(DspPipe::Audio, struct_addresses.size());
+    // Then write the struct addresses.
+    for (u16 addr : struct_addresses) {
+        WriteU16(DspPipe::Audio, addr);
+    }
+}
+
+void PipeWrite(DspPipe pipe_number, const std::vector<u8>& buffer) {
+    switch (pipe_number) {
+    case DspPipe::Audio: {
+        if (buffer.size() != 4) {
+            LOG_ERROR(Audio_DSP, "DspPipe::Audio: Unexpected buffer length %zu was written", buffer.size());
+            return;
+        }
+
+        enum class StateChange {
+            Initalize = 0,
+            Shutdown = 1,
+            Wakeup = 2,
+            Sleep = 3
+        };
+
+        // The difference between Initialize and Wakeup is that Input state is maintained
+        // when sleeping but isn't when turning it off and on again. (TODO: Implement this.)
+        // Waking up from sleep garbles some of the structs in the memory region. (TODO:
+        // Implement this.) Applications store away the state of these structs before
+        // sleeping and reset it back after wakeup on behalf of the DSP.
+
+        switch (static_cast<StateChange>(buffer[0])) {
+        case StateChange::Initalize:
+            LOG_INFO(Audio_DSP, "Application has requested initialization of DSP hardware");
+            ResetPipes();
+            AudioPipeWriteStructAddresses();
+            dsp_state = DspState::On;
+            break;
+        case StateChange::Shutdown:
+            LOG_INFO(Audio_DSP, "Application has requested shutdown of DSP hardware");
+            dsp_state = DspState::Off;
+            break;
+        case StateChange::Wakeup:
+            LOG_INFO(Audio_DSP, "Application has requested wakeup of DSP hardware");
+            ResetPipes();
+            AudioPipeWriteStructAddresses();
+            dsp_state = DspState::On;
+            break;
+        case StateChange::Sleep:
+            LOG_INFO(Audio_DSP, "Application has requested sleep of DSP hardware");
+            UNIMPLEMENTED();
+            dsp_state = DspState::Sleeping;
+            break;
+        default:
+            LOG_ERROR(Audio_DSP, "Application has requested unknown state transition of DSP hardware %hhu", buffer[0]);
+            dsp_state = DspState::Off;
+            break;
+        }
+
+        return;
+    }
+    default:
+        LOG_CRITICAL(Audio_DSP, "pipe_number = %u unimplemented", pipe_number);
+        UNIMPLEMENTED();
+        return;
+    }
+}
+
+DspState GetDspState() {
+    return dsp_state;
+}
+
+} // namespace HLE
+} // namespace DSP