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