mirror of https://github.com/OpenTTD/OpenTTD.git
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file allegro_s.cpp Playing sound via Allegro. */
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#ifdef WITH_ALLEGRO
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#include "../stdafx.h"
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#include "../mixer.h"
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#include "../debug.h"
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#include "allegro_s.h"
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#include <allegro.h>
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#include "../safeguards.h"
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static FSoundDriver_Allegro iFSoundDriver_Allegro;
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/** The stream we are writing too */
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static AUDIOSTREAM *_stream = nullptr;
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/** The number of samples in the buffer */
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static int _buffer_size;
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void SoundDriver_Allegro::MainLoop()
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{
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/* We haven't opened a stream yet */
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if (_stream == nullptr) return;
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void *data = get_audio_stream_buffer(_stream);
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/* We don't have to fill the stream yet */
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if (data == nullptr) return;
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/* Mix the samples */
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MxMixSamples(data, _buffer_size);
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/* Allegro sound is always unsigned, so we need to correct that */
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uint16_t *snd = (uint16_t*)data;
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for (int i = 0; i < _buffer_size * 2; i++) snd[i] ^= 0x8000;
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/* Tell we've filled the stream */
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free_audio_stream_buffer(_stream);
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}
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/**
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* There are multiple modules that might be using Allegro and
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* Allegro can only be initiated once.
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*/
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extern int _allegro_instance_count;
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std::optional<std::string_view> SoundDriver_Allegro::Start(const StringList &parm)
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{
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if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, nullptr)) {
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Debug(driver, 0, "allegro: install_allegro failed '{}'", allegro_error);
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return "Failed to set up Allegro";
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}
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_allegro_instance_count++;
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/* Initialise the sound */
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if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, nullptr) != 0) {
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Debug(driver, 0, "allegro: install_sound failed '{}'", allegro_error);
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return "Failed to set up Allegro sound";
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}
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/* Okay, there's no soundcard */
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if (digi_card == DIGI_NONE) {
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Debug(driver, 0, "allegro: no sound card found");
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return "No sound card found";
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}
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int hz = GetDriverParamInt(parm, "hz", 44100);
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_buffer_size = GetDriverParamInt(parm, "samples", 1024) * hz / 11025;
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_stream = play_audio_stream(_buffer_size, 16, true, hz, 255, 128);
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MxInitialize(hz);
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return std::nullopt;
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}
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void SoundDriver_Allegro::Stop()
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{
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if (_stream != nullptr) {
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stop_audio_stream(_stream);
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_stream = nullptr;
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}
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remove_sound();
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if (--_allegro_instance_count == 0) allegro_exit();
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}
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#endif /* WITH_ALLEGRO */
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