libtimidity.cpp

00001 /* $Id: libtimidity.cpp 11842 2008-01-13 22:10:54Z rubidium $ */
00002 
00003 #include "../stdafx.h"
00004 #include "../openttd.h"
00005 #include "../sound_type.h"
00006 #include "../variables.h"
00007 #include "../debug.h"
00008 #include "libtimidity.h"
00009 #include <fcntl.h>
00010 #include <sys/types.h>
00011 #include <sys/wait.h>
00012 #include <unistd.h>
00013 #include <signal.h>
00014 #include <sys/stat.h>
00015 #include <errno.h>
00016 #include <timidity.h>
00017 #if defined(PSP)
00018 #include <pspaudiolib.h>
00019 #endif /* PSP */
00020 
00021 enum MidiState {
00022   MIDI_STOPPED = 0,
00023   MIDI_PLAYING = 1,
00024 };
00025 
00026 static struct {
00027   MidIStream *stream;
00028   MidSongOptions options;
00029   MidSong *song;
00030 
00031   MidiState status;
00032   uint32 song_length;
00033   uint32 song_position;
00034 } _midi;
00035 
00036 #if defined(PSP)
00037 static void AudioOutCallback(void *buf, unsigned int _reqn, void *userdata)
00038 {
00039   memset(buf, 0, _reqn * PSP_NUM_AUDIO_CHANNELS);
00040   if (_midi.status == MIDI_PLAYING) {
00041     mid_song_read_wave(_midi.song, buf, _reqn * PSP_NUM_AUDIO_CHANNELS);
00042   }
00043 }
00044 #endif /* PSP */
00045 
00046 static FMusicDriver_LibTimidity iFMusicDriver_LibTimidity;
00047 
00048 const char *MusicDriver_LibTimidity::Start(const char *const *param)
00049 {
00050   _midi.status = MIDI_STOPPED;
00051 
00052   if (mid_init(param == NULL ? NULL : (char *)param[0]) < 0) {
00053     /* If init fails, it can be because no configuration was found.
00054      *  If it was not forced via param, try to load it without a
00055      *  configuration. Who knows that works. */
00056     if (param != NULL || mid_init_no_config() < 0) {
00057       return "error initializing timidity";
00058     }
00059   }
00060   DEBUG(driver, 1, "successfully initialised timidity");
00061 
00062   _midi.options.rate = 44100;
00063   _midi.options.format = MID_AUDIO_S16LSB;
00064   _midi.options.channels = 2;
00065 #if defined(PSP)
00066   _midi.options.buffer_size = PSP_NUM_AUDIO_SAMPLES;
00067 #else
00068   _midi.options.buffer_size = _midi.options.rate;
00069 #endif
00070 
00071 #if defined(PSP)
00072   pspAudioInit();
00073   pspAudioSetChannelCallback(_midi.options.channels, &AudioOutCallback, NULL);
00074   pspAudioSetVolume(_midi.options.channels, PSP_VOLUME_MAX, PSP_VOLUME_MAX);
00075 #endif /* PSP */
00076 
00077   return NULL;
00078 }
00079 
00080 void MusicDriver_LibTimidity::Stop()
00081 {
00082   if (_midi.status == MIDI_PLAYING) {
00083     _midi.status = MIDI_STOPPED;
00084     mid_song_free(_midi.song);
00085   }
00086   mid_exit();
00087 }
00088 
00089 void MusicDriver_LibTimidity::PlaySong(const char *filename)
00090 {
00091   _midi.stream = mid_istream_open_file(filename);
00092   if (_midi.stream == NULL) {
00093     DEBUG(driver, 0, "Could not open music file");
00094     return;
00095   }
00096 
00097   _midi.song = mid_song_load(_midi.stream, &_midi.options);
00098   mid_istream_close(_midi.stream);
00099   _midi.song_length = mid_song_get_total_time(_midi.song);
00100 
00101   if (_midi.song == NULL) {
00102     DEBUG(driver, 1, "Invalid MIDI file");
00103     return;
00104   }
00105 
00106   mid_song_start(_midi.song);
00107   _midi.status = MIDI_PLAYING;
00108 }
00109 
00110 void MusicDriver_LibTimidity::StopSong()
00111 {
00112   _midi.status = MIDI_STOPPED;
00113   mid_song_free(_midi.song);
00114 }
00115 
00116 bool MusicDriver_LibTimidity::IsSongPlaying()
00117 {
00118   if (_midi.status == MIDI_PLAYING) {
00119     _midi.song_position = mid_song_get_time(_midi.song);
00120     if (_midi.song_position >= _midi.song_length) {
00121       _midi.status = MIDI_STOPPED;
00122       _midi.song_position = 0;
00123     }
00124   }
00125 
00126   return (_midi.status == MIDI_PLAYING);
00127 }
00128 
00129 void MusicDriver_LibTimidity::SetVolume(byte vol)
00130 {
00131   if (_midi.song != NULL)
00132     mid_song_set_volume(_midi.song, vol);
00133 }

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