libtimidity.cpp

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00001 /* $Id: libtimidity.cpp 15903 2009-03-30 23:15:05Z rubidium $ */
00002 
00005 #include "../stdafx.h"
00006 #include "../openttd.h"
00007 #include "../sound_type.h"
00008 #include "../variables.h"
00009 #include "../debug.h"
00010 #include "libtimidity.h"
00011 #include <fcntl.h>
00012 #include <sys/types.h>
00013 #include <sys/wait.h>
00014 #include <unistd.h>
00015 #include <signal.h>
00016 #include <sys/stat.h>
00017 #include <errno.h>
00018 #include <timidity.h>
00019 #if defined(PSP)
00020 #include <pspaudiolib.h>
00021 #endif /* PSP */
00022 
00023 enum MidiState {
00024   MIDI_STOPPED = 0,
00025   MIDI_PLAYING = 1,
00026 };
00027 
00028 static struct {
00029   MidIStream *stream;
00030   MidSongOptions options;
00031   MidSong *song;
00032 
00033   MidiState status;
00034   uint32 song_length;
00035   uint32 song_position;
00036 } _midi;
00037 
00038 #if defined(PSP)
00039 static void AudioOutCallback(void *buf, unsigned int _reqn, void *userdata)
00040 {
00041   memset(buf, 0, _reqn * PSP_NUM_AUDIO_CHANNELS);
00042   if (_midi.status == MIDI_PLAYING) {
00043     mid_song_read_wave(_midi.song, buf, _reqn * PSP_NUM_AUDIO_CHANNELS);
00044   }
00045 }
00046 #endif /* PSP */
00047 
00048 static FMusicDriver_LibTimidity iFMusicDriver_LibTimidity;
00049 
00050 const char *MusicDriver_LibTimidity::Start(const char * const *param)
00051 {
00052   _midi.status = MIDI_STOPPED;
00053   _midi.song = NULL;
00054 
00055   if (mid_init(param == NULL ? NULL : (char *)param[0]) < 0) {
00056     /* If init fails, it can be because no configuration was found.
00057      *  If it was not forced via param, try to load it without a
00058      *  configuration. Who knows that works. */
00059     if (param != NULL || mid_init_no_config() < 0) {
00060       return "error initializing timidity";
00061     }
00062   }
00063   DEBUG(driver, 1, "successfully initialised timidity");
00064 
00065   _midi.options.rate = 44100;
00066   _midi.options.format = MID_AUDIO_S16LSB;
00067   _midi.options.channels = 2;
00068 #if defined(PSP)
00069   _midi.options.buffer_size = PSP_NUM_AUDIO_SAMPLES;
00070 #else
00071   _midi.options.buffer_size = _midi.options.rate;
00072 #endif
00073 
00074 #if defined(PSP)
00075   pspAudioInit();
00076   pspAudioSetChannelCallback(_midi.options.channels, &AudioOutCallback, NULL);
00077   pspAudioSetVolume(_midi.options.channels, PSP_VOLUME_MAX, PSP_VOLUME_MAX);
00078 #endif /* PSP */
00079 
00080   return NULL;
00081 }
00082 
00083 void MusicDriver_LibTimidity::Stop()
00084 {
00085   if (_midi.status == MIDI_PLAYING) this->StopSong();
00086   mid_exit();
00087 }
00088 
00089 void MusicDriver_LibTimidity::PlaySong(const char *filename)
00090 {
00091   this->StopSong();
00092 
00093   _midi.stream = mid_istream_open_file(filename);
00094   if (_midi.stream == NULL) {
00095     DEBUG(driver, 0, "Could not open music file");
00096     return;
00097   }
00098 
00099   _midi.song = mid_song_load(_midi.stream, &_midi.options);
00100   mid_istream_close(_midi.stream);
00101   _midi.song_length = mid_song_get_total_time(_midi.song);
00102 
00103   if (_midi.song == NULL) {
00104     DEBUG(driver, 1, "Invalid MIDI file");
00105     return;
00106   }
00107 
00108   mid_song_start(_midi.song);
00109   _midi.status = MIDI_PLAYING;
00110 }
00111 
00112 void MusicDriver_LibTimidity::StopSong()
00113 {
00114   _midi.status = MIDI_STOPPED;
00115   /* mid_song_free cannot handle NULL! */
00116   if (_midi.song != NULL) mid_song_free(_midi.song);
00117   _midi.song = NULL;
00118 }
00119 
00120 bool MusicDriver_LibTimidity::IsSongPlaying()
00121 {
00122   if (_midi.status == MIDI_PLAYING) {
00123     _midi.song_position = mid_song_get_time(_midi.song);
00124     if (_midi.song_position >= _midi.song_length) {
00125       _midi.status = MIDI_STOPPED;
00126       _midi.song_position = 0;
00127     }
00128   }
00129 
00130   return (_midi.status == MIDI_PLAYING);
00131 }
00132 
00133 void MusicDriver_LibTimidity::SetVolume(byte vol)
00134 {
00135   if (_midi.song != NULL) mid_song_set_volume(_midi.song, vol);
00136 }

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