BACKENDS: Partial merge of gsoc2010-opengl: Audio CD changes only

This commit contains the AudioCDManager changes from the gsoc2010-opengl
branch. The other changes in that branch are restricted to the backends
directory only (plus configure).

The Nintendo DS and Dreamcast ports still need to be ported over to
the new Audio CD system, but that should be fairly easy to do.

svn-id: r54147

2 files changed, 196 insertions, 0 deletions

diff --git a/backends/audiocd/sdl/sdl-audiocd.cpp b/backends/audiocd/sdl/sdl-audiocd.cpp
new file mode 100644
index 0000000000..62ab333f54
--- /dev/null
+++ b/backends/audiocd/sdl/sdl-audiocd.cpp
@@ -0,0 +1,139 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#if defined(SDL_BACKEND)
+
+// Disable symbol overrides so that we can use system headers.
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "backends/audiocd/sdl/sdl-audiocd.h"
+
+SdlAudioCDManager::SdlAudioCDManager()
+	:
+	_cdrom(0),
+	_cdTrack(0),
+	_cdNumLoops(0),
+	_cdStartFrame(0),
+	_cdDuration(0),
+	_cdEndTime(0),
+	_cdStopTime(0) {
+
+}
+
+SdlAudioCDManager::~SdlAudioCDManager() {
+	if (_cdrom) {
+		SDL_CDStop(_cdrom);
+		SDL_CDClose(_cdrom);
+	}
+}
+
+bool SdlAudioCDManager::openCD(int drive) {
+	if (SDL_InitSubSystem(SDL_INIT_CDROM) == -1)
+		_cdrom = NULL;
+	else {
+		_cdrom = SDL_CDOpen(drive);
+		// Did it open? Check if _cdrom is NULL
+		if (!_cdrom) {
+			warning("Couldn't open drive: %s", SDL_GetError());
+		} else {
+			_cdNumLoops = 0;
+			_cdStopTime = 0;
+			_cdEndTime = 0;
+		}
+	}
+
+	return (_cdrom != NULL);
+}
+
+void SdlAudioCDManager::stopCD() {
+	// Stop CD Audio in 1/10th of a second
+	_cdStopTime = SDL_GetTicks() + 100;
+	_cdNumLoops = 0;
+}
+
+void SdlAudioCDManager::playCD(int track, int num_loops, int start_frame, int duration) {
+	if (!num_loops && !start_frame)
+		return;
+
+	if (!_cdrom)
+		return;
+
+	if (duration > 0)
+		duration += 5;
+
+	_cdTrack = track;
+	_cdNumLoops = num_loops;
+	_cdStartFrame = start_frame;
+
+	SDL_CDStatus(_cdrom);
+	if (start_frame == 0 && duration == 0)
+		SDL_CDPlayTracks(_cdrom, track, 0, 1, 0);
+	else
+		SDL_CDPlayTracks(_cdrom, track, start_frame, 0, duration);
+	_cdDuration = duration;
+	_cdStopTime = 0;
+	_cdEndTime = SDL_GetTicks() + _cdrom->track[track].length * 1000 / CD_FPS;
+}
+
+bool SdlAudioCDManager::pollCD() const {
+	if (!_cdrom)
+		return false;
+
+	return (_cdNumLoops != 0 && (SDL_GetTicks() < _cdEndTime || SDL_CDStatus(_cdrom) == CD_PLAYING));
+}
+
+void SdlAudioCDManager::updateCD() {
+	if (!_cdrom)
+		return;
+
+	if (_cdStopTime != 0 && SDL_GetTicks() >= _cdStopTime) {
+		SDL_CDStop(_cdrom);
+		_cdNumLoops = 0;
+		_cdStopTime = 0;
+		return;
+	}
+
+	if (_cdNumLoops == 0 || SDL_GetTicks() < _cdEndTime)
+		return;
+
+	if (_cdNumLoops != 1 && SDL_CDStatus(_cdrom) != CD_STOPPED) {
+		// Wait another second for it to be done
+		_cdEndTime += 1000;
+		return;
+	}
+
+	if (_cdNumLoops > 0)
+		_cdNumLoops--;
+
+	if (_cdNumLoops != 0) {
+		if (_cdStartFrame == 0 && _cdDuration == 0)
+			SDL_CDPlayTracks(_cdrom, _cdTrack, 0, 1, 0);
+		else
+			SDL_CDPlayTracks(_cdrom, _cdTrack, _cdStartFrame, 0, _cdDuration);
+		_cdEndTime = SDL_GetTicks() + _cdrom->track[_cdTrack].length * 1000 / CD_FPS;
+	}
+}
+
+#endif
diff --git a/backends/audiocd/sdl/sdl-audiocd.h b/backends/audiocd/sdl/sdl-audiocd.h
new file mode 100644
index 0000000000..42ac980c51
--- /dev/null
+++ b/backends/audiocd/sdl/sdl-audiocd.h
@@ -0,0 +1,57 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef BACKENDS_AUDIOCD_SDL_H
+#define BACKENDS_AUDIOCD_SDL_H
+
+#include "backends/audiocd/default/default-audiocd.h"
+
+#if defined(__SYMBIAN32__)
+#include <esdl\SDL.h>
+#else
+#include <SDL.h>
+#endif
+
+/**
+ * The SDL audio cd manager. Implements real audio cd playback.
+ */
+class SdlAudioCDManager : public DefaultAudioCDManager {
+public:
+	SdlAudioCDManager();
+	virtual ~SdlAudioCDManager();
+
+protected:
+	virtual bool openCD(int drive);
+	virtual void updateCD();
+	virtual bool pollCD() const;
+	virtual void playCD(int track, int num_loops, int start_frame, int duration);
+	virtual void stopCD();
+
+	SDL_CD *_cdrom;
+	int _cdTrack, _cdNumLoops, _cdStartFrame, _cdDuration;
+	uint32 _cdEndTime, _cdStopTime;
+};
+
+#endif