8b00954ec7
This commit: * Adds a new subproject, audio_core. * Defines structures that exist in DSP shared memory. * Hooks up various other parts of the emulator into audio core. This sets the foundation for a later HLE DSP implementation.
54 lines
2 KiB
C++
54 lines
2 KiB
C++
// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "audio_core/audio_core.h"
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#include "audio_core/hle/dsp.h"
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#include "core/core_timing.h"
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#include "core/hle/kernel/vm_manager.h"
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#include "core/hle/service/dsp_dsp.h"
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namespace AudioCore {
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// Audio Ticks occur about every 5 miliseconds.
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static int tick_event; ///< CoreTiming event
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static constexpr u64 audio_frame_ticks = 1310252ull; ///< Units: ARM11 cycles
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static void AudioTickCallback(u64 /*userdata*/, int cycles_late) {
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if (DSP::HLE::Tick()) {
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// HACK: We're not signaling the interrups when they should be, but just firing them all off together.
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// It should be only (interrupt_id = 2, channel_id = 2) that's signalled here.
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// TODO(merry): Understand when the other interrupts are fired.
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DSP_DSP::SignalAllInterrupts();
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}
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// Reschedule recurrent event
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CoreTiming::ScheduleEvent(audio_frame_ticks - cycles_late, tick_event);
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}
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/// Initialise Audio
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void Init() {
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DSP::HLE::Init();
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tick_event = CoreTiming::RegisterEvent("AudioCore::tick_event", AudioTickCallback);
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CoreTiming::ScheduleEvent(audio_frame_ticks, tick_event);
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}
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/// Add DSP address spaces to Process's address space.
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void AddAddressSpace(Kernel::VMManager& address_space) {
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auto r0_vma = address_space.MapBackingMemory(DSP::HLE::region0_base, reinterpret_cast<u8*>(&DSP::HLE::g_region0), sizeof(DSP::HLE::SharedMemory), Kernel::MemoryState::IO).MoveFrom();
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address_space.Reprotect(r0_vma, Kernel::VMAPermission::ReadWrite);
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auto r1_vma = address_space.MapBackingMemory(DSP::HLE::region1_base, reinterpret_cast<u8*>(&DSP::HLE::g_region1), sizeof(DSP::HLE::SharedMemory), Kernel::MemoryState::IO).MoveFrom();
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address_space.Reprotect(r1_vma, Kernel::VMAPermission::ReadWrite);
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}
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/// Shutdown Audio
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void Shutdown() {
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CoreTiming::UnscheduleEvent(tick_event, 0);
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DSP::HLE::Shutdown();
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}
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} //namespace
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