Raimon @ quifisraimon
61d8b0a808
- [NEW] [tia] áudio en el seu propi mòdul, pa no tornar-se loco - [NEW] Afegides frequències de rellotge per a NTSC, PAL, SECAM i PAL-M - [NEW] Mòdul Speaker conectat a tia-audio
89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
#include "speaker.h"
|
|
#include <SDL3/SDL.h>
|
|
#include <vector>
|
|
#include <stdlib.h>
|
|
|
|
namespace speaker
|
|
{
|
|
int sampling_freq = 44100;
|
|
uint16_t audio_buffer_size = 1024;
|
|
SDL_AudioStream* sdlAudioStream = nullptr;
|
|
uint8_t *sound_buffer = nullptr;
|
|
uint16_t sound_pos=0;
|
|
float t_sound=0.0f;
|
|
float cycles_per_sample = 0.0f;
|
|
|
|
std::vector<uint8_t(*)()> sources;
|
|
|
|
void init(float clock_frequency)
|
|
{
|
|
if (sound_buffer) quit();
|
|
|
|
SDL_AudioSpec audioSpec{SDL_AUDIO_U8, 1, sampling_freq};
|
|
|
|
sdlAudioStream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &audioSpec, nullptr, nullptr);
|
|
|
|
cycles_per_sample = clock_frequency / (float)sampling_freq;
|
|
sound_buffer = (uint8_t*)malloc(audio_buffer_size);
|
|
sound_pos = 0;
|
|
t_sound = 0.0f;
|
|
|
|
enable();
|
|
}
|
|
|
|
void quit()
|
|
{
|
|
disable();
|
|
sources.clear();
|
|
if (sound_buffer) {
|
|
free(sound_buffer);
|
|
sound_buffer = nullptr;
|
|
}
|
|
if (sdlAudioStream) {
|
|
SDL_DestroyAudioStream(sdlAudioStream);
|
|
sdlAudioStream = nullptr;
|
|
}
|
|
}
|
|
|
|
void enable()
|
|
{
|
|
SDL_ResumeAudioStreamDevice(sdlAudioStream);
|
|
}
|
|
|
|
void disable()
|
|
{
|
|
SDL_PauseAudioStreamDevice(sdlAudioStream);
|
|
}
|
|
|
|
void register_source(uint8_t(*callback)())
|
|
{
|
|
sources.push_back(callback);
|
|
}
|
|
|
|
void update(const uint32_t dt)
|
|
{
|
|
t_sound += (float)dt;
|
|
if (t_sound >= cycles_per_sample)
|
|
{
|
|
t_sound -= cycles_per_sample;
|
|
|
|
uint32_t sample = 0;
|
|
for (auto callback : sources) sample += callback();
|
|
sample /= sources.size();
|
|
|
|
sound_buffer[sound_pos++] = (uint8_t)sample;
|
|
}
|
|
|
|
if (sound_pos >= audio_buffer_size)
|
|
{
|
|
SDL_PutAudioStreamData(sdlAudioStream, sound_buffer, sound_pos);
|
|
sound_pos = 0;
|
|
|
|
while (SDL_GetAudioStreamQueued(sdlAudioStream) > 2048)
|
|
{
|
|
SDL_Delay(1);
|
|
}
|
|
}
|
|
}
|
|
}
|