1 files changed, 371 insertions, 0 deletions
diff --git a/src/music/qtmidi.cpp b/src/music/qtmidi.cpp
new file mode 100644
index 000000000..6f0a215d0
--- /dev/null
+++ b/src/music/qtmidi.cpp
@@ -0,0 +1,371 @@
+/* $Id$ */
+
+/**
+ * @file qtmidi.c
+ * @brief MIDI music player for MacOS X using QuickTime.
+ *
+ * This music player should work in all MacOS X releases starting from 10.0,
+ * as QuickTime is an integral part of the system since the old days of the
+ * Motorola 68k-based Macintoshes. The only extra dependency apart from
+ * QuickTime itself is Carbon, which is included since 10.0 as well.
+ *
+ * QuickTime gets fooled with the MIDI files from Transport Tycoon Deluxe
+ * because of the @c .gm suffix. To force QuickTime to load the MIDI files
+ * without the need of dealing with the individual QuickTime components
+ * needed to play music (data source, MIDI parser, note allocators,
+ * synthesizers and the like) some Carbon functions are used to set the file
+ * type as seen by QuickTime, using @c FSpSetFInfo() (which modifies the
+ * file's resource fork).
+ */
+
+
+/*
+ * OpenTTD includes.
+ */
+#define  WindowClass OSX_WindowClass
+#include <QuickTime/QuickTime.h>
+#undef   WindowClass
+
+#include "../stdafx.h"
+#include "../openttd.h"
+#include "qtmidi.h"
+
+/*
+ * System includes. We need to workaround with some defines because there's
+ * stuff already defined in QuickTime headers.
+ */
+#define  OTTD_Random OSX_OTTD_Random
+#undef   OTTD_Random
+#undef   WindowClass
+#undef   SL_ERROR
+#undef   bool
+
+#include <assert.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+// we need to include debug.h after CoreServices because defining DEBUG will break CoreServices in OSX 10.2
+#include "../debug.h"
+
+
+enum {
+	midiType = 'Midi' /**< OSType code for MIDI songs. */
+};
+
+
+/**
+ * Converts a Unix-like pathname to a @c FSSpec structure which may be
+ * used with functions from several MacOS X frameworks (Carbon, QuickTime,
+ * etc). The pointed file or directory must exist.
+ *
+ * @param *path A string containing a Unix-like path.
+ * @param *spec Pointer to a @c FSSpec structure where the result will be
+ *              stored.
+ * @return Wether the conversion was successful.
+ */
+static bool PathToFSSpec(const char *path, FSSpec *spec)
+{
+	FSRef ref;
+	assert(spec != NULL);
+	assert(path != NULL);
+
+	return
+		FSPathMakeRef((UInt8*)path, &ref, NULL) == noErr &&
+		FSGetCatalogInfo(&ref, kFSCatInfoNone, NULL, NULL, spec, NULL) == noErr;
+}
+
+
+/**
+ * Sets the @c OSType of a given file to @c 'Midi', but only if it's not
+ * already set.
+ *
+ * @param *spec A @c FSSpec structure referencing a file.
+ */
+static void SetMIDITypeIfNeeded(const FSSpec *spec)
+{
+	FSRef ref;
+	FSCatalogInfo catalogInfo;
+
+	assert(spec);
+
+	if (noErr != FSpMakeFSRef(spec, &ref)) return;
+	if (noErr != FSGetCatalogInfo(&ref, kFSCatInfoNodeFlags | kFSCatInfoFinderInfo, &catalogInfo, NULL, NULL, NULL)) return;
+	if (!(catalogInfo.nodeFlags & kFSNodeIsDirectoryMask)) {
+		FileInfo * const info = (FileInfo *) catalogInfo.finderInfo;
+		if (info->fileType != midiType && !(info->finderFlags & kIsAlias)) {
+			OSErr e;
+			info->fileType = midiType;
+			e = FSSetCatalogInfo(&ref, kFSCatInfoFinderInfo, &catalogInfo);
+			if (e == noErr) {
+				DEBUG(driver, 3, "qtmidi: changed filetype to 'Midi'");
+			} else {
+				DEBUG(driver, 0, "qtmidi: changing filetype to 'Midi' failed - error %d", e);
+			}
+		}
+	}
+}
+
+
+/**
+ * Loads a MIDI file and returns it as a QuickTime Movie structure.
+ *
+ * @param *path String with the path of an existing MIDI file.
+ * @param *moov Pointer to a @c Movie where the result will be stored.
+ * @return Wether the file was loaded and the @c Movie successfully created.
+ */
+static bool LoadMovieForMIDIFile(const char *path, Movie *moov)
+{
+	int fd;
+	int ret;
+	char magic[4];
+	FSSpec fsspec;
+	short refnum = 0;
+	short resid  = 0;
+
+	assert(path != NULL);
+	assert(moov != NULL);
+
+	DEBUG(driver, 2, "qtmidi: start loading '%s'...", path);
+
+	/*
+	 * XXX Manual check for MIDI header ('MThd'), as I don't know how to make
+	 * QuickTime load MIDI files without a .mid suffix without knowing it's
+	 * a MIDI file and setting the OSType of the file to the 'Midi' value.
+	 * Perhahaps ugly, but it seems that it does the Right Thing(tm).
+	 */
+	fd = open(path, O_RDONLY, 0);
+	if (fd == -1) return false;
+	ret = read(fd, magic, 4);
+	close(fd);
+	if (ret < 4) return false;
+
+	DEBUG(driver, 3, "qtmidi: header is '%.4s'", magic);
+	if (magic[0] != 'M' || magic[1] != 'T' || magic[2] != 'h' || magic[3] != 'd')
+		return false;
+
+	if (!PathToFSSpec(path, &fsspec)) return false;
+	SetMIDITypeIfNeeded(&fsspec);
+
+	if (OpenMovieFile(&fsspec, &refnum, fsRdPerm) != noErr) return false;
+	DEBUG(driver, 3, "qtmidi: '%s' successfully opened", path);
+
+	if (noErr != NewMovieFromFile(moov, refnum, &resid, NULL,
+				newMovieActive | newMovieDontAskUnresolvedDataRefs, NULL)) {
+		CloseMovieFile(refnum);
+		return false;
+	}
+	DEBUG(driver, 3, "qtmidi: movie container created");
+
+	CloseMovieFile(refnum);
+	return true;
+}
+
+
+/**
+ * Flag which has the @c true value when QuickTime is available and
+ * initialized.
+ */
+static bool _quicktime_started = false;
+
+
+/**
+ * Initialize QuickTime if needed. This function sets the
+ * #_quicktime_started flag to @c true if QuickTime is present in the system
+ * and it was initialized properly.
+ */
+static void InitQuickTimeIfNeeded(void)
+{
+	OSStatus dummy;
+
+	if (_quicktime_started) return;
+
+	DEBUG(driver, 2, "qtmidi: initializing Quicktime");
+	/* Be polite: check wether QuickTime is available and initialize it. */
+	_quicktime_started =
+		(noErr == Gestalt(gestaltQuickTime, &dummy)) &&
+		(noErr == EnterMovies());
+	if (!_quicktime_started) DEBUG(driver, 0, "qtmidi: Quicktime initialization failed!");
+}
+
+
+/** Possible states of the QuickTime music driver. */
+enum {
+	QT_STATE_IDLE, /**< No file loaded. */
+	QT_STATE_PLAY, /**< File loaded, playing. */
+	QT_STATE_STOP, /**< File loaded, stopped. */
+};
+
+
+static Movie _quicktime_movie;                  /**< Current QuickTime @c Movie. */
+static byte  _quicktime_volume = 127;           /**< Current volume. */
+static int   _quicktime_state  = QT_STATE_IDLE; /**< Current player state. */
+
+
+/**
+ * Maps OpenTTD volume to QuickTime notion of volume.
+ */
+#define VOLUME  ((short)((0x00FF & _quicktime_volume) << 1))
+
+
+static void StopSong(void);
+
+
+/**
+ * Initialized the MIDI player, including QuickTime initialization.
+ *
+ * @todo Give better error messages by inspecting error codes returned by
+ * @c Gestalt() and @c EnterMovies(). Needs changes in
+ * #InitQuickTimeIfNeeded.
+ */
+static const char* StartDriver(const char * const *parm)
+{
+	InitQuickTimeIfNeeded();
+	return (_quicktime_started) ? NULL : "can't initialize QuickTime";
+}
+
+
+/**
+ * Checks wether the player is active.
+ *
+ * This function is called at regular intervals from OpenTTD's main loop, so
+ * we call @c MoviesTask() from here to let QuickTime do its work.
+ */
+static bool SongIsPlaying(void)
+{
+	if (!_quicktime_started) return true;
+
+	switch (_quicktime_state) {
+		case QT_STATE_IDLE:
+		case QT_STATE_STOP:
+			/* Do nothing. */
+			break;
+		case QT_STATE_PLAY:
+			MoviesTask(_quicktime_movie, 0);
+			/* Check wether movie ended. */
+			if (IsMovieDone(_quicktime_movie) ||
+					(GetMovieTime(_quicktime_movie, NULL) >=
+					 GetMovieDuration(_quicktime_movie)))
+				_quicktime_state = QT_STATE_STOP;
+	}
+
+	return _quicktime_state == QT_STATE_PLAY;
+}
+
+
+/**
+ * Stops the MIDI player.
+ *
+ * Stops playing and frees any used resources before returning. As it
+ * deinitilizes QuickTime, the #_quicktime_started flag is set to @c false.
+ */
+static void StopDriver(void)
+{
+	if (!_quicktime_started) return;
+
+	DEBUG(driver, 2, "qtmidi: stopping driver...");
+	switch (_quicktime_state) {
+		case QT_STATE_IDLE:
+			DEBUG(driver, 3, "qtmidi: stopping not needed, already idle");
+			/* Do nothing. */
+			break;
+		case QT_STATE_PLAY:
+			StopSong();
+		case QT_STATE_STOP:
+			DisposeMovie(_quicktime_movie);
+	}
+
+	ExitMovies();
+	_quicktime_started = false;
+}
+
+
+/**
+ * Starts playing a new song.
+ *
+ * @param filename Path to a MIDI file.
+ */
+static void PlaySong(const char *filename)
+{
+	if (!_quicktime_started) return;
+
+	DEBUG(driver, 2, "qtmidi: trying to play '%s'", filename);
+	switch (_quicktime_state) {
+		case QT_STATE_PLAY:
+			StopSong();
+			DEBUG(driver, 3, "qtmidi: previous tune stopped");
+			/* XXX Fall-through -- no break needed. */
+		case QT_STATE_STOP:
+			DisposeMovie(_quicktime_movie);
+			DEBUG(driver, 3, "qtmidi: previous tune disposed");
+			_quicktime_state = QT_STATE_IDLE;
+			/* XXX Fall-through -- no break needed. */
+		case QT_STATE_IDLE:
+			LoadMovieForMIDIFile(filename, &_quicktime_movie);
+			SetMovieVolume(_quicktime_movie, VOLUME);
+			StartMovie(_quicktime_movie);
+			_quicktime_state = QT_STATE_PLAY;
+	}
+	DEBUG(driver, 3, "qtmidi: playing '%s'", filename);
+}
+
+
+/**
+ * Stops playing the current song, if the player is active.
+ */
+static void StopSong(void)
+{
+	if (!_quicktime_started) return;
+
+	switch (_quicktime_state) {
+		case QT_STATE_IDLE:
+			/* XXX Fall-through -- no break needed. */
+		case QT_STATE_STOP:
+			DEBUG(driver, 3, "qtmidi: stop requested, but already idle");
+			/* Do nothing. */
+			break;
+		case QT_STATE_PLAY:
+			StopMovie(_quicktime_movie);
+			_quicktime_state = QT_STATE_STOP;
+			DEBUG(driver, 3, "qtmidi: player stopped");
+	}
+}
+
+
+/**
+ * Changes the playing volume of the MIDI player.
+ *
+ * As QuickTime controls volume in a per-movie basis, the desired volume is
+ * stored in #_quicktime_volume, and the volume is set here using the
+ * #VOLUME macro, @b and when loading new song in #PlaySong.
+ *
+ * @param vol The desired volume, range of the value is @c 0-127
+ */
+static void SetVolume(byte vol)
+{
+	if (!_quicktime_started) return;
+
+	_quicktime_volume = vol;
+
+	DEBUG(driver, 2, "qtmidi: set volume to %u (%hi)", vol, VOLUME);
+	switch (_quicktime_state) {
+		case QT_STATE_IDLE:
+			/* Do nothing. */
+			break;
+		case QT_STATE_PLAY:
+		case QT_STATE_STOP:
+			SetMovieVolume(_quicktime_movie, VOLUME);
+	}
+}
+
+
+/**
+ * Table of callbacks that implement the QuickTime MIDI player.
+ */
+const HalMusicDriver _qtime_music_driver = {
+	StartDriver,
+	StopDriver,
+	PlaySong,
+	StopSong,
+	SongIsPlaying,
+	SetVolume,
+};