ADL: Add bell function

1 files changed, 94 insertions, 0 deletions

diff --git a/engines/adl/speaker.cpp b/engines/adl/speaker.cpp
new file mode 100644
index 0000000000..532d361cd9
--- /dev/null
+++ b/engines/adl/speaker.cpp
@@ -0,0 +1,94 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "common/system.h"
+#include "common/events.h"
+
+#include "engines/engine.h"
+
+#include "audio/audiostream.h"
+#include "audio/decoders/raw.h"
+
+#include "adl/speaker.h"
+#include "adl/adl.h"
+
+namespace Adl {
+
+// Number of times to duplicate each sample
+#define SAMPLE_DUP 4
+// Bell frequency in Hz
+#define BELL_FREQ 1000
+// Sample rate
+#define SAMPLE_RATE (BELL_FREQ * SAMPLE_DUP * 2)
+// Number of waves per 0.1 seconds (bell length)
+#define BELL_WAVE_COUNT (SAMPLE_RATE / 10 / SAMPLE_DUP / 2)
+// Length of bell in samples
+#define BELL_LEN (BELL_WAVE_COUNT * SAMPLE_DUP * 2)
+// Length of silence in samples
+#define SILENCE_LEN (SAMPLE_RATE / 80)
+
+Speaker::~Speaker() {
+	delete[] _bell;
+	delete[] _silence;
+}
+
+Speaker::Speaker() {
+	_bell = new byte[BELL_LEN];
+
+	byte *buf = _bell;
+	for (uint i = 0; i < BELL_WAVE_COUNT; ++i) {
+		for (uint j = 0; j < SAMPLE_DUP; ++j)
+			*buf++ = 0x00;
+		for (uint j = 0; j < SAMPLE_DUP; ++j)
+			*buf++ = 0xff;
+	}
+
+	_silence = new byte[SILENCE_LEN];
+
+	buf = _silence;
+	for (uint i = 0; i < SILENCE_LEN; ++i)
+		*buf++ = 0x80;
+}
+
+void Speaker::bell(uint count) {
+	Audio::QueuingAudioStream *stream = Audio::makeQueuingAudioStream(SAMPLE_RATE, false);
+	Audio::SoundHandle handle;
+
+	stream->queueBuffer(_bell, BELL_LEN, DisposeAfterUse::NO, Audio::FLAG_UNSIGNED);
+
+	for (uint i = 1; i < count; ++i) {
+		stream->queueBuffer(_silence, SILENCE_LEN, DisposeAfterUse::NO, Audio::FLAG_UNSIGNED);
+		stream->queueBuffer(_bell, BELL_LEN, DisposeAfterUse::NO, Audio::FLAG_UNSIGNED);
+	}
+
+	stream->finish();
+
+	g_system->getMixer()->playStream(Audio::Mixer::kPlainSoundType, &handle, stream);
+
+	while (!g_engine->shouldQuit() && g_system->getMixer()->isSoundHandleActive(handle)) {
+		Common::Event event;
+		static_cast<AdlEngine *>(g_engine)->pollEvent(event);
+		g_system->delayMillis(16);
+	}
+}
+
+} // End of namespace Adl