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https://github.com/libretro/scummvm.git
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95 lines
2.7 KiB
C++
95 lines
2.7 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/system.h"
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#include "common/events.h"
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#include "engines/engine.h"
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#include "audio/audiostream.h"
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#include "audio/decoders/raw.h"
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#include "adl/speaker.h"
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#include "adl/adl.h"
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namespace Adl {
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// Number of times to duplicate each sample
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#define SAMPLE_DUP 4
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// Bell frequency in Hz
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#define BELL_FREQ 1000
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// Sample rate
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#define SAMPLE_RATE (BELL_FREQ * SAMPLE_DUP * 2)
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// Number of waves per 0.1 seconds (bell length)
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#define BELL_WAVE_COUNT (SAMPLE_RATE / 10 / SAMPLE_DUP / 2)
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// Length of bell in samples
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#define BELL_LEN (BELL_WAVE_COUNT * SAMPLE_DUP * 2)
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// Length of silence in samples
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#define SILENCE_LEN (SAMPLE_RATE / 80)
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Speaker::~Speaker() {
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delete[] _bell;
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delete[] _silence;
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}
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Speaker::Speaker() {
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_bell = new byte[BELL_LEN];
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byte *buf = _bell;
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for (uint i = 0; i < BELL_WAVE_COUNT; ++i) {
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for (uint j = 0; j < SAMPLE_DUP; ++j)
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*buf++ = 0x00;
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for (uint j = 0; j < SAMPLE_DUP; ++j)
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*buf++ = 0xff;
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}
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_silence = new byte[SILENCE_LEN];
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buf = _silence;
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for (uint i = 0; i < SILENCE_LEN; ++i)
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*buf++ = 0x80;
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}
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void Speaker::bell(uint count) {
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Audio::QueuingAudioStream *stream = Audio::makeQueuingAudioStream(SAMPLE_RATE, false);
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Audio::SoundHandle handle;
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stream->queueBuffer(_bell, BELL_LEN, DisposeAfterUse::NO, Audio::FLAG_UNSIGNED);
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for (uint i = 1; i < count; ++i) {
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stream->queueBuffer(_silence, SILENCE_LEN, DisposeAfterUse::NO, Audio::FLAG_UNSIGNED);
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stream->queueBuffer(_bell, BELL_LEN, DisposeAfterUse::NO, Audio::FLAG_UNSIGNED);
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}
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stream->finish();
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g_system->getMixer()->playStream(Audio::Mixer::kPlainSoundType, &handle, stream);
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while (!g_engine->shouldQuit() && g_system->getMixer()->isSoundHandleActive(handle)) {
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Common::Event event;
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static_cast<AdlEngine *>(g_engine)->pollEvent(event);
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g_system->delayMillis(16);
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}
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}
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} // End of namespace Adl
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