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engines/ultima/nuvie/sound/decoder/adlib_sfx_stream.cpp

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+/* Created by Eric Fry
+ * Copyright (C) 2011 The Nuvie Team
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ */
+
+#include "ultima/nuvie/core/nuvie_defs.h"
+#include "ultima/nuvie/sound/adplug/opl_class.h"
+#include "ultima/nuvie/sound/origin_fx_adib_driver.h"
+#include "ultima/nuvie/conf/configuration.h"
+#include "ultima/nuvie/sound/decoder/adlib_sfx_stream.h"
+
+namespace Ultima {
+namespace Nuvie {
+
+AdLibSfxStream::AdLibSfxStream(const Configuration *cfg, int rate, uint8 channel, sint8 note, uint8 velocity, uint8 program_number, uint32 d) {
+	interrupt_samples_left = 0;
+	opl = new OplClass(rate, true, true); // 16bit stereo
+	driver = new OriginFXAdLibDriver(cfg, opl);
+	if (program_number != 0xff) {
+		driver->program_change(channel, program_number);
+	}
+	driver->control_mode_change(channel, 0x7, 0x7f);
+	driver->play_note(channel, note, velocity);
+	duration = d;
+	interrupt_rate = (int)(opl->getRate() / 60);
+	total_samples_played = 0;
+}
+
+AdLibSfxStream::~AdLibSfxStream() {
+	delete driver;
+	delete opl;
+}
+
+int AdLibSfxStream::readBuffer(sint16 *buffer, const int numSamples) {
+
+	//sint32 i, j;
+	short *data = (short *)buffer;
+
+	int len = numSamples / 2;
+	total_samples_played += numSamples;
+
+	if (interrupt_samples_left > 0) {
+		if (interrupt_samples_left > len) {
+			opl->update(data, len);
+			interrupt_samples_left -= len;
+			return numSamples;
+		}
+
+		opl->update(data, interrupt_samples_left);
+		data += interrupt_samples_left * 2;
+		len -= interrupt_samples_left;
+		interrupt_samples_left = 0;
+	}
+
+	for (int i = len; i > 0;) {
+		driver->interrupt_vector();
+
+		int j = interrupt_rate;
+		if (j > i) {
+			interrupt_samples_left = j - i;
+			j = i;
+		}
+		opl->update(data, j);
+
+		data += j * 2;
+		i -= j;
+	}
+
+
+//driver->play_note(8, 0x40, 0);
+	return numSamples;
+}
+
+} // End of namespace Nuvie
+} // End of namespace Ultima