src/music/bemidi.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file bemidi.cpp Support for BeOS midi. */
   9
  10 #include "../stdafx.h"
  11 #include "../openttd.h"
  12 #include "bemidi.h"
  13 #include "../base_media_base.h"
  14 #include "midifile.hpp"
  15
  16 #include "../safeguards.h"
  17
  18 /** Factory for BeOS' midi player. */
  19 static FMusicDriver_BeMidi iFMusicDriver_BeMidi;
  20
  21 std::optional<std::string_view> MusicDriver_BeMidi::Start(const StringList &parm)
  22 {
  23         return std::nullopt;
  24 }
  25
  26 void MusicDriver_BeMidi::Stop()
  27 {
  28         this->StopSong();
  29 }
  30
  31 void MusicDriver_BeMidi::PlaySong(const MusicSongInfo &song)
  32 {
  33         std::string filename = MidiFile::GetSMFFile(song);
  34
  35         this->Stop();
  36         this->midi_synth_file = new BMidiSynthFile();
  37         if (!filename.empty()) {
  38                 entry_ref midiRef;
  39                 get_ref_for_path(filename.c_str(), &midiRef);
  40                 if (this->midi_synth_file->LoadFile(&midiRef) == B_OK) {
  41                         this->midi_synth_file->SetVolume(this->current_volume);
  42                         this->midi_synth_file->Start();
  43                         this->just_started = true;
  44                 } else {
  45                         this->Stop();
  46                 }
  47         }
  48 }
  49
  50 void MusicDriver_BeMidi::StopSong()
  51 {
  52         /* Reusing BMidiSynthFile can cause stuck notes when switching
  53          * tracks, just delete whole object entirely. */
  54         delete this->midi_synth_file;
  55         this->midi_synth_file = nullptr;
  56 }
  57
  58 bool MusicDriver_BeMidi::IsSongPlaying()
  59 {
  60         if (this->midi_synth_file == nullptr) return false;
  61
  62         /* IsFinished() returns true for a moment after Start()
  63          * but before it really starts playing, use just_started flag
  64          * to prevent accidental track skipping. */
  65         if (this->just_started) {
  66                 if (!this->midi_synth_file->IsFinished()) this->just_started = false;
  67                 return true;
  68         }
  69         return !this->midi_synth_file->IsFinished();
  70 }
  71
  72 void MusicDriver_BeMidi::SetVolume(uint8_t vol)
  73 {
  74         this->current_volume = vol / 128.0;
  75         if (this->midi_synth_file != nullptr) this->midi_synth_file->SetVolume(this->current_volume);
  76 }