# libtimidity.cpp

Go to the documentation of this file.

    00001 /* $Id$ */
    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 "../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 /* PSP */
    00028
    00029 enum MidiState {
    00030   MIDI_STOPPED = 0,
    00031   MIDI_PLAYING = 1,
    00032 };
    00033
    00034 static struct {
    00035   MidIStream *stream;
    00036   MidSongOptions options;
    00037   MidSong *song;
    00038
    00039   MidiState status;
    00040   uint32 song_length;
    00041   uint32 song_position;
    00042 } _midi;
    00043
    00044 #if defined(PSP)
    00045 static void AudioOutCallback(void *buf, unsigned int _reqn, void *userdata)
    00046 {
    00047   memset(buf, 0, _reqn * PSP_NUM_AUDIO_CHANNELS);
    00048   if (_midi.status == MIDI_PLAYING) {
    00049     mid_song_read_wave(_midi.song, buf, _reqn * PSP_NUM_AUDIO_CHANNELS);
    00050   }
    00051 }
    00052 #endif /* PSP */
    00053
    00054 static FMusicDriver_LibTimidity iFMusicDriver_LibTimidity;
    00055
    00056 const char *MusicDriver_LibTimidity::Start(const char * const *param)
    00057 {
    00058   _midi.status = MIDI_STOPPED;
    00059   _midi.song = NULL;
    00060
    00061   if (mid_init(param == NULL ? NULL : const_cast<char *>(param[0])) < 0) {
    00062     /* If init fails, it can be because no configuration was found.
    00063      *  If it was not forced via param, try to load it without a
    00064      *  configuration. Who knows that works. */
    00065     if (param != NULL || mid_init_no_config() < 0) {
    00066       return "error initializing timidity";
    00067     }
    00068   }
    00069   DEBUG(driver, 1, "successfully initialised timidity");
    00070
    00071   _midi.options.rate = 44100;
    00072   _midi.options.format = MID_AUDIO_S16LSB;
    00073   _midi.options.channels = 2;
    00074 #if defined(PSP)
    00075   _midi.options.buffer_size = PSP_NUM_AUDIO_SAMPLES;
    00076 #else
    00077   _midi.options.buffer_size = _midi.options.rate;
    00078 #endif
    00079
    00080 #if defined(PSP)
    00081   pspAudioInit();
    00082   pspAudioSetChannelCallback(_midi.options.channels, &AudioOutCallback, NULL);
    00083   pspAudioSetVolume(_midi.options.channels, PSP_VOLUME_MAX, PSP_VOLUME_MAX);
    00084 #endif /* PSP */
    00085
    00086   return NULL;
    00087 }
    00088
    00089 void MusicDriver_LibTimidity::Stop()
    00090 {
    00091   if (_midi.status == MIDI_PLAYING) this->StopSong();
    00092   mid_exit();
    00093 }
    00094
    00095 void MusicDriver_LibTimidity::PlaySong(const char *filename)
    00096 {
    00097   this->StopSong();
    00098
    00099   _midi.stream = mid_istream_open_file(filename);
    00100   if (_midi.stream == NULL) {
    00101     DEBUG(driver, 0, "Could not open music file");
    00102     return;
    00103   }
    00104
    00105   _midi.song = mid_song_load(_midi.stream, &_midi.options);
    00106   mid_istream_close(_midi.stream);
    00107   _midi.song_length = mid_song_get_total_time(_midi.song);
    00108
    00109   if (_midi.song == NULL) {
    00110     DEBUG(driver, 1, "Invalid MIDI file");
    00111     return;
    00112   }
    00113
    00114   mid_song_start(_midi.song);
    00115   _midi.status = MIDI_PLAYING;
    00116 }
    00117
    00118 void MusicDriver_LibTimidity::StopSong()
    00119 {
    00120   _midi.status = MIDI_STOPPED;
    00121   /* mid_song_free cannot handle NULL! */
    00122   if (_midi.song != NULL) mid_song_free(_midi.song);
    00123   _midi.song = NULL;
    00124 }
    00125
    00126 bool MusicDriver_LibTimidity::IsSongPlaying()
    00127 {
    00128   if (_midi.status == MIDI_PLAYING) {
    00129     _midi.song_position = mid_song_get_time(_midi.song);
    00130     if (_midi.song_position >= _midi.song_length) {
    00131       _midi.status = MIDI_STOPPED;
    00132       _midi.song_position = 0;
    00133     }
    00134   }
    00135
    00136   return (_midi.status == MIDI_PLAYING);
    00137 }
    00138
    00139 void MusicDriver_LibTimidity::SetVolume(byte vol)
    00140 {
    00141   if (_midi.song != NULL) mid_song_set_volume(_midi.song, vol);
    00142 }