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Pulled out the divisor for audio.

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This commit is contained in:
Thomas Harte 2017-04-03 21:16:39 -04:00
parent defec2c9b0
commit f95015c7f6
4 changed files with 9 additions and 9 deletions
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6
Machines/Atari2600/Atari2600.cpp
View File

@ -38,7 +38,7 @@ Machine::Machine() :
void Machine::setup_output(float aspect_ratio) {
bus_->tia_.reset(new TIA);
bus_->speaker_.reset(new Speaker);
bus_->speaker_->set_input_rate((float)(get_clock_rate() / 38.0));
bus_->speaker_->set_input_rate((float)(get_clock_rate() / (double)CPUTicksPerAudioTick));
bus_->tia_->get_crt()->set_delegate(this);
}
@ -149,8 +149,8 @@ void Machine::crt_did_end_batch_of_frames(Outputs::CRT::CRT *crt, unsigned int n
bus_->tia_->set_output_mode(TIA::OutputMode::PAL);
}
bus_->speaker_->set_input_rate((float)(clock_rate / 38.0));
bus_->speaker_->set_high_frequency_cut_off((float)(clock_rate / (38.0 * 2.0)));
bus_->speaker_->set_input_rate((float)(clock_rate / (double)CPUTicksPerAudioTick));
bus_->speaker_->set_high_frequency_cut_off((float)(clock_rate / ((double)CPUTicksPerAudioTick * 2.0)));
set_clock_rate(clock_rate);
}
}

3
Machines/Atari2600/Atari2600.hpp
View File

@ -23,9 +23,6 @@
namespace Atari2600 {
const unsigned int number_of_upcoming_events = 6;
const unsigned int number_of_recorded_counters = 7;
class Machine:
public CRTMachine::Machine,
public ConfigurationTarget::Machine,

7
Machines/Atari2600/Bus.hpp
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@ -9,9 +9,10 @@
#ifndef Atari2600_Bus_hpp
#define Atari2600_Bus_hpp
#include "Atari2600.hpp"
#include "PIA.hpp"
#include "TIA.hpp"
#include "Speaker.hpp"
#include "TIA.hpp"
namespace Atari2600 {
@ -38,8 +39,8 @@ class Bus {
// speaker backlog accumlation counter
unsigned int cycles_since_speaker_update_;
inline void update_audio() {
unsigned int audio_cycles = cycles_since_speaker_update_ / 114;
cycles_since_speaker_update_ %= 114;
unsigned int audio_cycles = cycles_since_speaker_update_ / (CPUTicksPerAudioTick * 3);
cycles_since_speaker_update_ %= (CPUTicksPerAudioTick * 3);
speaker_->run_for_cycles(audio_cycles);
}

2
Machines/Atari2600/Speaker.hpp
View File

@ -13,6 +13,8 @@
namespace Atari2600 {
const int CPUTicksPerAudioTick = 38;
class Speaker: public ::Outputs::Filter<Speaker> {
public:
Speaker();