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Add audio pipeline.

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This commit is contained in:
Thomas Harte 2023-11-21 22:11:32 -05:00
parent 0344af986c
commit 972d1d1ddd
1 changed files with 42 additions and 1 deletions
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43
Machines/PCCompatible/PCCompatible.cpp
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@ -17,10 +17,13 @@
#include "../../InstructionSets/x86/Instruction.hpp"
#include "../../InstructionSets/x86/Perform.hpp"
#include "../../Components/AudioToggle/AudioToggle.hpp"
#include "../../Components/8255/i8255.hpp"
#include "../../Numeric/RegisterSizes.hpp"
#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
#include "../AudioProducer.hpp"
#include "../ScanProducer.hpp"
#include "../TimedMachine.hpp"
@ -522,6 +525,7 @@ class FlowController {
class ConcreteMachine:
public Machine,
public MachineTypes::TimedMachine,
public MachineTypes::AudioProducer,
public MachineTypes::ScanProducer
{
public:
@ -532,10 +536,18 @@ class ConcreteMachine:
ConcreteMachine(
[[maybe_unused]] const Analyser::Static::Target &target,
const ROMMachine::ROMFetcher &rom_fetcher
) : pit_observer_(pic_), pit_(pit_observer_), ppi_(ppi_handler_), context(pit_, dma_, ppi_, pic_) {
) :
pit_observer_(pic_),
pit_(pit_observer_),
ppi_(ppi_handler_),
context(pit_, dma_, ppi_, pic_),
audio_toggle_(audio_queue_),
speaker_(audio_toggle_)
{
// Use clock rate as a MIPS count; keeping it as a multiple or divisor of the PIT frequency is easy.
static constexpr int pit_frequency = 1'193'182;
set_clock_rate(double(pit_frequency));
speaker_.set_input_rate(double(pit_frequency));
// Fetch the BIOS. [8088 only, for now]
const auto bios = ROM::Name::PCCompatibleGLaBIOS;
@ -550,6 +562,10 @@ class ConcreteMachine:
context.memory.install(0x10'0000 - bios_contents.size(), bios_contents.data(), bios_contents.size());
}
~ConcreteMachine() {
audio_queue_.flush();
}
// MARK: - TimedMachine.
// bool log = false;
// std::string previous;
@ -563,6 +579,9 @@ class ConcreteMachine:
// Advance the PIT.
pit_.run_for(1);
// Advance audio.
++cycles_since_audio_update_;
// Advance the CPU.
cpu_divisor_ += CPUMultiplier;
int cycles = cpu_divisor_ / CPUDivisor;
@ -631,6 +650,22 @@ class ConcreteMachine:
return Outputs::Display::ScanStatus();
}
// MARK: - AudioProducer.
Outputs::Speaker::Speaker *get_speaker() override {
return &speaker_;
}
void flush_output(int outputs) final {
if(outputs & Output::Audio) {
update_audio();
audio_queue_.perform();
}
}
void update_audio() {
speaker_.run_for(audio_queue_, cycles_since_audio_update_);
}
private:
PIC pic_;
DMA dma_;
@ -674,6 +709,12 @@ class ConcreteMachine:
std::pair<int, InstructionSet::x86::Instruction<false>> decoded;
int cpu_divisor_ = 0;
// PC speaker.
Concurrency::AsyncTaskQueue<false> audio_queue_;
Audio::Toggle audio_toggle_;
Outputs::Speaker::PullLowpass<Audio::Toggle> speaker_;
Cycles cycles_since_audio_update_ = 0;
};