mirror of https://github.com/JorjBauer/aiie.git
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
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* Apple // emulator for *ix
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*
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* This software package is subject to the GNU General Public License
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* version 3 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* Copyright 2013-2015 Aaron Culliney
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*
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*/
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/*
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* Apple //e core sound system support. Source inspired/derived from AppleWin.
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*
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* 2015/10/01 AUDIO LIFECYCLE WARNING : CPU thread owns all audio, otherwise bad things may happen in system sound layer
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* (OpenAL/OpenSLES/ALSA/etc)
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*/
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#include "common.h"
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#define MAX_SOUND_DEVICES 100
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static AudioContext_s *audioContext = NULL;
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bool audio_isAvailable = false;
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float audio_latencySecs = 0.25f;
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AudioBackend_s *audio_backend = NULL;
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//-----------------------------------------------------------------------------
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long audio_createSoundBuffer(INOUT AudioBuffer_s **audioBuffer) {
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// CPU thread owns audio lifecycle (see note above)
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assert(pthread_self() == cpu_thread_id);
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if (!audio_isAvailable) {
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*audioBuffer = NULL;
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return -1;
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}
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if (*audioBuffer) {
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audio_destroySoundBuffer(audioBuffer);
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}
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long err = 0;
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do {
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if (!audioContext) {
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ERRLOG("Cannot create sound buffer, no context");
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err = -1;
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break;
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}
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err = audioContext->CreateSoundBuffer(audioContext, audioBuffer);
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if (err) {
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break;
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}
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} while (0);
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return err;
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}
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void audio_destroySoundBuffer(INOUT AudioBuffer_s **audioBuffer) {
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// CPU thread owns audio lifecycle (see note above)
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assert(pthread_self() == cpu_thread_id);
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if (audioContext) {
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audioContext->DestroySoundBuffer(audioContext, audioBuffer);
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}
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}
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bool audio_init(void) {
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// CPU thread owns audio lifecycle (see note above)
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assert(pthread_self() == cpu_thread_id);
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if (audio_isAvailable) {
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return true;
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}
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do {
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if (!audio_backend) {
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LOG("No backend audio available, cannot initialize soundcore");
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break;
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}
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if (audioContext) {
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audio_backend->shutdown(&audioContext);
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}
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long err = audio_backend->setup((AudioContext_s**)&audioContext);
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if (err) {
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LOG("Failed to create an audio context!");
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break;
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}
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audio_isAvailable = true;
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} while (0);
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return audio_isAvailable;
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}
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void audio_shutdown(void) {
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// CPU thread owns audio lifecycle (see note above)
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assert(pthread_self() == cpu_thread_id);
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if (!audio_isAvailable) {
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return;
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}
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audio_backend->shutdown(&audioContext);
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audio_isAvailable = false;
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}
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void audio_pause(void) {
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// CPU thread owns audio lifecycle (see note above)
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// Deadlock on Kindle Fire 1st Gen if audio_pause() and audio_resume() happen off CPU thread ...
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#ifdef __APPLE__
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# warning FIXME TODO : this assert is firing on iOS port ... but the assert is valid ... fix soon
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#else
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assert(pthread_self() == cpu_thread_id);
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#endif
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if (!audio_isAvailable) {
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return;
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}
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audio_backend->pause(audioContext);
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}
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void audio_resume(void) {
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// CPU thread owns audio lifecycle (see note above)
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assert(pthread_self() == cpu_thread_id);
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if (!audio_isAvailable) {
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return;
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}
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audio_backend->resume(audioContext);
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}
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void audio_setLatency(float latencySecs) {
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audio_latencySecs = latencySecs;
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}
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float audio_getLatency(void) {
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return audio_latencySecs;
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}
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