reinette-IIe/speaker.cpp
ArthurFerreira2 4c8b396e53
initial commit
first public release
2021-07-07 17:00:47 +02:00

80 lines
3.1 KiB
C++

/*
* reinette, a french Apple II emulator, using SDL2
* and powered by puce65c02 - a WDS 65c02 cpu emulator by the same author
* Last modified 1st of July 2021
* Copyright (c) 2021 Arthur Ferreira (arthur.ferreira2@gmail.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "reinette.h"
Speaker::Speaker() {
if (SDL_Init(SDL_INIT_AUDIO) != 0) {
printf("Error: %s\n", SDL_GetError());
exit(EXIT_FAILURE);
}
SDL_AudioSpec desired = { 96000, AUDIO_S8, 1, 0, 512, 0, 0, NULL, NULL };
audioDevice = SDL_OpenAudioDevice(NULL, 0, &desired, NULL, SDL_FALSE); // get the audio device ID
setVolume(volume);
SDL_PauseAudioDevice(audioDevice, muted); // unmute it (muted is false)
}
void Speaker::play() {
static unsigned long long int lastTick = 0LL;
static bool SPKR = false; // $C030 Speaker toggle
SPKR = !SPKR; // toggle speaker state
Uint32 length = (int)((double)(cpu->ticks - lastTick) / 10.42f / speed); // 1000000Hz / 96000Hz = 10.4166
lastTick = cpu->ticks;
if (!muted) {
if (length > audioBufferSize)
SDL_QueueAudio(audioDevice, audioBuffer[2], audioBufferSize); // silence
else
SDL_QueueAudio(audioDevice, audioBuffer[SPKR], length | 1); // | 1 TO HEAR HIGH FREQ SOUNDS
}
}
void Speaker::toggleMute() {
SDL_PauseAudioDevice(audioDevice, muted);
SDL_ClearQueuedAudio(audioDevice);
}
void Speaker::setVolume(int newVolume) {
if (muted) {
muted = false;
toggleMute();
}
if (newVolume > 127)
volume = 127;
else if (newVolume < 0)
volume = 0;
else volume = newVolume;
for (int i = 0; i < audioBufferSize; i++) { // two audio buffers,
audioBuffer[true][i] = (int8_t)volume; // one used when SPKR is true
audioBuffer[false][i] = (int8_t)-volume; // the other when SPKR is false
audioBuffer[2][i] = 0; // silence
}
}