(svn r8757) -Add: added libtimidity music driver (it is a nice small library simular to timidity via extmidi)

[PSP] -Add: added PSP specific code for libtimidity. libtimidity code is based on the work of Turulo. Tnx a bunch!

2 files changed, 153 insertions, 0 deletions

diff --git a/src/music/libtimidity.cpp b/src/music/libtimidity.cpp
new file mode 100644
index 000000000..705d07181
--- /dev/null
+++ b/src/music/libtimidity.cpp
@@ -0,0 +1,143 @@
+/* $Id: extmidi.c 4692 2006-05-02 19:09:49Z peter1138 $ */
+
+#include "../stdafx.h"
+#include "../openttd.h"
+#include "../sound.h"
+#include "../string.h"
+#include "../variables.h"
+#include "../debug.h"
+#include "libtimidity.h"
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <timidity.h>
+#if defined(PSP)
+#include <pspaudiolib.h>
+#endif /* PSP */
+
+enum MidiState {
+	MIDI_STOPPED = 0,
+	MIDI_PLAYING = 1,
+};
+
+static struct {
+	MidIStream *stream;
+	MidSongOptions options;
+	MidSong *song;
+
+	MidiState status;
+	uint32 song_length;
+	uint32 song_position;
+} _midi;
+
+#if defined(PSP)
+static void AudioOutCallback(void *buf, unsigned int _reqn, void *userdata)
+{
+	memset(buf, 0, _reqn * PSP_NUM_AUDIO_CHANNELS);
+	if (_midi.status == MIDI_PLAYING) {
+		mid_song_read_wave(_midi.song, buf, _reqn * PSP_NUM_AUDIO_CHANNELS);
+	}
+}
+#endif /* PSP */
+
+static const char *LibtimidityMidiStart(const char *const *param)
+{
+	_midi.status = MIDI_STOPPED;
+
+	if (mid_init(param == NULL ? NULL : (char *)param[0]) < 0) {
+		/* If init fails, it can be because no configuration was found.
+		 *  If it was not forced via param, try to load it without a
+		 *  configuration. Who knows that works. */
+		if (param != NULL || mid_init_no_config() < 0) {
+			DEBUG(driver, 0, "error initializing timidity");
+			return NULL;
+		}
+	}
+	DEBUG(driver, 1, "successfully initialised timidity");
+
+	_midi.options.rate = 44100;
+	_midi.options.format = MID_AUDIO_S16LSB;
+	_midi.options.channels = 2;
+#if defined(PSP)
+	_midi.options.buffer_size = PSP_NUM_AUDIO_SAMPLES;
+#else
+	_midi.options.buffer_size = _midi.options.rate;
+#endif
+
+#if defined(PSP)
+	pspAudioInit();
+	pspAudioSetChannelCallback(_midi.options.channels, &AudioOutCallback, NULL);
+	pspAudioSetVolume(_midi.options.channels, PSP_VOLUME_MAX, PSP_VOLUME_MAX);
+#endif /* PSP */
+
+	return NULL;
+}
+
+static void LibtimidityMidiStop(void)
+{
+	if (_midi.status == MIDI_PLAYING) {
+		_midi.status = MIDI_STOPPED;
+		mid_song_free(_midi.song);
+	}
+	mid_exit();
+}
+
+static void LibtimidityMidiPlaySong(const char *filename)
+{
+	_midi.stream = mid_istream_open_file(filename);
+	if (_midi.stream == NULL) {
+		DEBUG(driver, 0, "Could not open music file");
+		return;
+	}
+
+	_midi.song = mid_song_load(_midi.stream, &_midi.options);
+	mid_istream_close(_midi.stream);
+	_midi.song_length = mid_song_get_total_time(_midi.song);
+
+	if (_midi.song == NULL) {
+		DEBUG(driver, 1, "Invalid MIDI file");
+		return;
+	}
+
+	mid_song_start(_midi.song);
+	_midi.status = MIDI_PLAYING;
+}
+
+static void LibtimidityMidiStopSong(void)
+{
+	_midi.status = MIDI_STOPPED;
+	mid_song_free(_midi.song);
+}
+
+static bool LibtimidityMidiIsPlaying(void)
+{
+	if (_midi.status == MIDI_PLAYING) {
+		_midi.song_position = mid_song_get_time(_midi.song);
+		if (_midi.song_position >= _midi.song_length) {
+			_midi.status = MIDI_STOPPED;
+			_midi.song_position = 0;
+		}
+	}
+
+	return (_midi.status == MIDI_PLAYING);
+}
+
+static void LibtimidityMidiSetVolume(byte vol)
+{
+	if (_midi.song != NULL)
+		mid_song_set_volume(_midi.song, vol);
+}
+
+const HalMusicDriver _libtimidity_music_driver = {
+	LibtimidityMidiStart,
+	LibtimidityMidiStop,
+	LibtimidityMidiPlaySong,
+	LibtimidityMidiStopSong,
+	LibtimidityMidiIsPlaying,
+	LibtimidityMidiSetVolume,
+};
+
diff --git a/src/music/libtimidity.h b/src/music/libtimidity.h
new file mode 100644
index 000000000..cf206e4b7
--- /dev/null
+++ b/src/music/libtimidity.h
@@ -0,0 +1,10 @@
+/* $Id: extmidi.h 2704 2005-07-25 07:16:10Z tron $ */
+
+#ifndef MUSIC_LIBTIMIDITY_H
+#define MUSIC_LIBTIMIDITY_H
+
+#include "../hal.h"
+
+extern const HalMusicDriver _libtimidity_music_driver;
+
+#endif /* MUSIC_LIBTIMIDITY_H */