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Respect user volume input.

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Basic tones are now present. Neato!
This commit is contained in:
Thomas Harte 2021-06-24 22:27:02 -04:00
parent 1a97cc8a91
commit c2d093fa3c
2 changed files with 18 additions and 7 deletions
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22
Machines/Enterprise/Dave.cpp
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@ -43,6 +43,12 @@ void Dave::write(uint16_t address, uint8_t value) {
});
}
void Dave::set_sample_volume_range(int16_t range) {
audio_queue_.defer([range, this] {
volume_ = range / (63*3);
});
}
void Dave::get_samples(std::size_t number_of_samples, int16_t *target) {
// Step 1: divide input clock to 125,000 Hz (?)
for(size_t c = 0; c < number_of_samples; c++) {
@ -61,13 +67,17 @@ void Dave::get_samples(std::size_t number_of_samples, int16_t *target) {
// Dumbest ever first attempt: sum channels.
target[(c << 1) + 0] =
channels_[0].amplitude[0] * channels_[0].output +
channels_[1].amplitude[0] * channels_[1].output +
channels_[2].amplitude[0] * channels_[2].output;
volume_ * (
channels_[0].amplitude[0] * channels_[0].output +
channels_[1].amplitude[0] * channels_[1].output +
channels_[2].amplitude[0] * channels_[2].output
);
target[(c << 1) + 1] =
channels_[0].amplitude[1] * channels_[0].output +
channels_[1].amplitude[1] * channels_[1].output +
channels_[2].amplitude[1] * channels_[2].output;
volume_ * (
channels_[0].amplitude[1] * channels_[0].output +
channels_[1].amplitude[1] * channels_[1].output +
channels_[2].amplitude[1] * channels_[2].output
);
}
}

3
Machines/Enterprise/Dave.hpp
View File

@ -28,7 +28,7 @@ class Dave: public Outputs::Speaker::SampleSource {
void write(uint16_t address, uint8_t value);
// MARK: - SampleSource.
void set_sample_volume_range([[maybe_unused]] int16_t range) {}
void set_sample_volume_range(int16_t range);
static constexpr bool get_is_stereo() { return true; } // Dave produces stereo sound.
void get_samples(std::size_t number_of_samples, int16_t *target);
@ -52,6 +52,7 @@ class Dave: public Outputs::Speaker::SampleSource {
uint16_t count = 0;
bool output = true;
} channels_[3];
int16_t volume_ = 0;
// Various polynomials that contribute to audio generation.
Numeric::LFSRv<0xc> poly4_;