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- [NEW] mòdul 'zx_speaker' per a unificar la eixida de só

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Raimon Zamora
2025-07-24 19:39:57 +02:00
parent 780afbc6a8
commit 91a8933544
6 changed files with 83 additions and 55 deletions
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47
zx_ula.cpp
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@@ -68,11 +68,6 @@ namespace zx_ula
static uint8_t ear = 0;
static uint8_t mic = 0;
// this variable keeps track of the last "1" written to the sound buffer, so when streaming it in the audio callback, if there
// are only zeros remaining in the buffer, we just discard it. It's a poor man's method of keeping the buffer size in control.
// This is useless when there are music, sounds, tape loading, etc... as 1's and 0's keep alternating
static uint16_t last_1 = 0;
void update_zx_keyboard()
{
const uint8_t *keys = SDL_GetKeyboardState(NULL);
@@ -231,47 +226,9 @@ namespace zx_ula
uint8_t get_ear() { return ear; }
void set_ear(const uint8_t val) { ear = val; }
#define SAMPLING_FREQ 44100
#define AUDIO_BUFFER_SIZE 2048
float cycles_per_sample;
SDL_AudioDeviceID sdlAudioDevice;
uint8_t sound_buffer[AUDIO_BUFFER_SIZE];
uint16_t sound_pos=0;
uint16_t t_sound=0;
void sound_init()
uint8_t get_sample()
{
SDL_AudioSpec audioSpec{SAMPLING_FREQ, AUDIO_U8, 1, 0, AUDIO_BUFFER_SIZE>>2, 0, 0, NULL, NULL};
sdlAudioDevice = SDL_OpenAudioDevice(NULL, 0, &audioSpec, NULL, 0);
cycles_per_sample = z80::getClock() / SAMPLING_FREQ;
sound_enable();
}
void sound_enable()
{
SDL_PauseAudioDevice(sdlAudioDevice, 0);
}
void sound_disable()
{
SDL_PauseAudioDevice(sdlAudioDevice, 1);
}
void sound_update(const uint8_t dt)
{
t_sound += dt;
if (t_sound>=cycles_per_sample) {
t_sound-=cycles_per_sample;
sound_buffer[(sound_pos++)&(AUDIO_BUFFER_SIZE-1)] = ear*128;
}
if (sound_pos>=1000) {
SDL_QueueAudio(sdlAudioDevice, sound_buffer, sound_pos);
sound_pos = 0;
while (SDL_GetQueuedAudioSize(sdlAudioDevice) > 4096 ) {}
}
return ear*128;
}
const int getKey(const char key)