libtimidity.cpp

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00001 /* $Id: libtimidity.cpp 17248 2009-08-21 20:21:05Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "../stdafx.h"
00013 #include "../openttd.h"
00014 #include "../sound_type.h"
00015 #include "../variables.h"
00016 #include "../debug.h"
00017 #include "libtimidity.h"
00018 #include <fcntl.h>
00019 #include <sys/types.h>
00020 #include <sys/wait.h>
00021 #include <unistd.h>
00022 #include <signal.h>
00023 #include <sys/stat.h>
00024 #include <errno.h>
00025 #include <timidity.h>
00026 #if defined(PSP)
00027 #include <pspaudiolib.h>
00028 #endif /* PSP */
00029 
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 /* PSP */
00054 
00055 static FMusicDriver_LibTimidity iFMusicDriver_LibTimidity;
00056 
00057 const char *MusicDriver_LibTimidity::Start(const char * const *param)
00058 {
00059   _midi.status = MIDI_STOPPED;
00060   _midi.song = NULL;
00061 
00062   if (mid_init(param == NULL ? NULL : const_cast<char *>(param[0])) < 0) {
00063     /* If init fails, it can be because no configuration was found.
00064      *  If it was not forced via param, try to load it without a
00065      *  configuration. Who knows that works. */
00066     if (param != NULL || mid_init_no_config() < 0) {
00067       return "error initializing timidity";
00068     }
00069   }
00070   DEBUG(driver, 1, "successfully initialised timidity");
00071 
00072   _midi.options.rate = 44100;
00073   _midi.options.format = MID_AUDIO_S16LSB;
00074   _midi.options.channels = 2;
00075 #if defined(PSP)
00076   _midi.options.buffer_size = PSP_NUM_AUDIO_SAMPLES;
00077 #else
00078   _midi.options.buffer_size = _midi.options.rate;
00079 #endif
00080 
00081 #if defined(PSP)
00082   pspAudioInit();
00083   pspAudioSetChannelCallback(_midi.options.channels, &AudioOutCallback, NULL);
00084   pspAudioSetVolume(_midi.options.channels, PSP_VOLUME_MAX, PSP_VOLUME_MAX);
00085 #endif /* PSP */
00086 
00087   return NULL;
00088 }
00089 
00090 void MusicDriver_LibTimidity::Stop()
00091 {
00092   if (_midi.status == MIDI_PLAYING) this->StopSong();
00093   mid_exit();
00094 }
00095 
00096 void MusicDriver_LibTimidity::PlaySong(const char *filename)
00097 {
00098   this->StopSong();
00099 
00100   _midi.stream = mid_istream_open_file(filename);
00101   if (_midi.stream == NULL) {
00102     DEBUG(driver, 0, "Could not open music file");
00103     return;
00104   }
00105 
00106   _midi.song = mid_song_load(_midi.stream, &_midi.options);
00107   mid_istream_close(_midi.stream);
00108   _midi.song_length = mid_song_get_total_time(_midi.song);
00109 
00110   if (_midi.song == NULL) {
00111     DEBUG(driver, 1, "Invalid MIDI file");
00112     return;
00113   }
00114 
00115   mid_song_start(_midi.song);
00116   _midi.status = MIDI_PLAYING;
00117 }
00118 
00119 void MusicDriver_LibTimidity::StopSong()
00120 {
00121   _midi.status = MIDI_STOPPED;
00122   /* mid_song_free cannot handle NULL! */
00123   if (_midi.song != NULL) mid_song_free(_midi.song);
00124   _midi.song = NULL;
00125 }
00126 
00127 bool MusicDriver_LibTimidity::IsSongPlaying()
00128 {
00129   if (_midi.status == MIDI_PLAYING) {
00130     _midi.song_position = mid_song_get_time(_midi.song);
00131     if (_midi.song_position >= _midi.song_length) {
00132       _midi.status = MIDI_STOPPED;
00133       _midi.song_position = 0;
00134     }
00135   }
00136 
00137   return (_midi.status == MIDI_PLAYING);
00138 }
00139 
00140 void MusicDriver_LibTimidity::SetVolume(byte vol)
00141 {
00142   if (_midi.song != NULL) mid_song_set_volume(_midi.song, vol);
00143 }

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