libtimidity.cpp
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00012 #include "../stdafx.h"
00013 #include "../openttd.h"
00014 #include "../sound_type.h"
00015 #include "../debug.h"
00016 #include "libtimidity.h"
00017 #include <fcntl.h>
00018 #include <sys/types.h>
00019 #include <sys/wait.h>
00020 #include <unistd.h>
00021 #include <signal.h>
00022 #include <sys/stat.h>
00023 #include <errno.h>
00024 #include <timidity.h>
00025 #if defined(PSP)
00026 #include <pspaudiolib.h>
00027 #endif
00028
00030 enum MidiState {
00031 MIDI_STOPPED = 0,
00032 MIDI_PLAYING = 1,
00033 };
00034
00035 static struct {
00036 MidIStream *stream;
00037 MidSongOptions options;
00038 MidSong *song;
00039
00040 MidiState status;
00041 uint32 song_length;
00042 uint32 song_position;
00043 } _midi;
00044
00045 #if defined(PSP)
00046 static void AudioOutCallback(void *buf, unsigned int _reqn, void *userdata)
00047 {
00048 memset(buf, 0, _reqn * PSP_NUM_AUDIO_CHANNELS);
00049 if (_midi.status == MIDI_PLAYING) {
00050 mid_song_read_wave(_midi.song, buf, _reqn * PSP_NUM_AUDIO_CHANNELS);
00051 }
00052 }
00053 #endif
00054
00056 static FMusicDriver_LibTimidity iFMusicDriver_LibTimidity;
00057
00058 const char *MusicDriver_LibTimidity::Start(const char * const *param)
00059 {
00060 _midi.status = MIDI_STOPPED;
00061 _midi.song = NULL;
00062
00063 if (mid_init(param == NULL ? NULL : const_cast<char *>(param[0])) < 0) {
00064
00065
00066
00067 if (param != NULL || mid_init_no_config() < 0) {
00068 return "error initializing timidity";
00069 }
00070 }
00071 DEBUG(driver, 1, "successfully initialised timidity");
00072
00073 _midi.options.rate = 44100;
00074 _midi.options.format = MID_AUDIO_S16LSB;
00075 _midi.options.channels = 2;
00076 #if defined(PSP)
00077 _midi.options.buffer_size = PSP_NUM_AUDIO_SAMPLES;
00078 #else
00079 _midi.options.buffer_size = _midi.options.rate;
00080 #endif
00081
00082 #if defined(PSP)
00083 pspAudioInit();
00084 pspAudioSetChannelCallback(_midi.options.channels, &AudioOutCallback, NULL);
00085 pspAudioSetVolume(_midi.options.channels, PSP_VOLUME_MAX, PSP_VOLUME_MAX);
00086 #endif
00087
00088 return NULL;
00089 }
00090
00091 void MusicDriver_LibTimidity::Stop()
00092 {
00093 if (_midi.status == MIDI_PLAYING) this->StopSong();
00094 mid_exit();
00095 }
00096
00097 void MusicDriver_LibTimidity::PlaySong(const char *filename)
00098 {
00099 this->StopSong();
00100
00101 _midi.stream = mid_istream_open_file(filename);
00102 if (_midi.stream == NULL) {
00103 DEBUG(driver, 0, "Could not open music file");
00104 return;
00105 }
00106
00107 _midi.song = mid_song_load(_midi.stream, &_midi.options);
00108 mid_istream_close(_midi.stream);
00109 _midi.song_length = mid_song_get_total_time(_midi.song);
00110
00111 if (_midi.song == NULL) {
00112 DEBUG(driver, 1, "Invalid MIDI file");
00113 return;
00114 }
00115
00116 mid_song_start(_midi.song);
00117 _midi.status = MIDI_PLAYING;
00118 }
00119
00120 void MusicDriver_LibTimidity::StopSong()
00121 {
00122 _midi.status = MIDI_STOPPED;
00123
00124 if (_midi.song != NULL) mid_song_free(_midi.song);
00125 _midi.song = NULL;
00126 }
00127
00128 bool MusicDriver_LibTimidity::IsSongPlaying()
00129 {
00130 if (_midi.status == MIDI_PLAYING) {
00131 _midi.song_position = mid_song_get_time(_midi.song);
00132 if (_midi.song_position >= _midi.song_length) {
00133 _midi.status = MIDI_STOPPED;
00134 _midi.song_position = 0;
00135 }
00136 }
00137
00138 return (_midi.status == MIDI_PLAYING);
00139 }
00140
00141 void MusicDriver_LibTimidity::SetVolume(byte vol)
00142 {
00143 if (_midi.song != NULL) mid_song_set_volume(_midi.song, vol);
00144 }