Added Hoenicke's PC-speaker waveform generator

and script interpreter for GF_OLD_BUNDLE music resources.

We'll try to get the waveform generator into a
MidiDriver wrapper for use with the 'SPK' resources
of later games, but this is usable for now.

Great work, Hoenicke!

svn-id: r8023

1 files changed, 104 insertions, 0 deletions

diff --git a/scumm/player_v2.h b/scumm/player_v2.h
new file mode 100644
index 0000000000..9b36e9ea82
--- /dev/null
+++ b/scumm/player_v2.h
@@ -0,0 +1,104 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001  Ludvig Strigeus
+ * Copyright (C) 2001-2003 The ScummVM project
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#ifndef PLAYER_V2_H
+#define PLAYER_V2_H
+
+#include "common/scummsys.h"
+#include "sound/mixer.h"
+
+struct channel_data {
+	uint16 time_left;          // 00
+	uint16 next_cmd;           // 02
+	uint16 base_freq;          // 04
+	uint16 freq_delta;         // 06
+	uint16 freq;               // 08
+	uint16 volume;             // 10
+	uint16 volume_delta;       // 12
+	uint16 tempo;              // 14
+	uint16 inter_note_pause;   // 16
+	uint16 transpose;          // 18
+	uint16 note_length;        // 20
+	uint16 hull_curve;         // 22
+	uint16 hull_offset;        // 24
+	uint16 hull_counter;       // 26
+	uint16 freqmod_table;      // 28
+	uint16 freqmod_offset;     // 30
+	uint16 freqmod_incr;       // 32
+	uint16 freqmod_multiplier; // 34
+	uint16 freqmod_modulo;     // 36
+	uint16 unknown[5];         // 38 - 46
+	uint16 music_script_nr;    // 48
+} GCC_PACK;
+
+union ChannelInfo {
+	channel_data d;
+	uint16 array[sizeof(channel_data)/2];
+};
+
+
+
+class Player_V2 {
+public:
+	Player_V2();
+	~Player_V2();
+
+	void startSound(int nr, byte *data);
+	void stopSound(int nr);
+	void stopAllSounds();
+	int  getSoundStatus(int nr);
+
+private:
+	SoundMixer *_mixer;
+	int _next_tick;
+
+	int sample_rate;
+	int ticks_per_sample;
+	int ticks_counted;
+	int samples_left;
+	int freq;
+	int last_freq;
+	int level;
+	int pcjr;
+	const uint16 *freqs_table;
+	unsigned int decay;
+
+	ChannelInfo channels[4];
+
+	int   current_nr;
+	byte *current_data;
+	int   next_nr;
+	byte *next_data;
+	byte *retaddr;
+
+	void execute_cmd(ChannelInfo *channel);
+	void next_freqs(ChannelInfo *channel);
+	void generate_samples(int16 *buf, int len);
+	void on_timer();
+	void clear_channel(int i);
+	void chainNextSound();
+
+	static void premix_proc(void *param, int16 *buf, uint len);
+	void do_mix (int16 *buf, int len);
+};
+
+#endif