bemidi.cpp

Go to the documentation of this file.

/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */
 
#include "../stdafx.h"
#include "../openttd.h"
#include "bemidi.h"
#include "../base_media_base.h"
#include "midifile.hpp"
 
#include "../safeguards.h"
 
static FMusicDriver_BeMidi iFMusicDriver_BeMidi;
 
std::optional<std::string_view> MusicDriver_BeMidi::Start(const StringList &parm)
{
  return std::nullopt;
}
 
void MusicDriver_BeMidi::Stop()
{
  this->StopSong();
}
 
void MusicDriver_BeMidi::PlaySong(const MusicSongInfo &song)
{
  std::string filename = MidiFile::GetSMFFile(song);
 
  this->Stop();
  this->midi_synth_file = new BMidiSynthFile();
  if (!filename.empty()) {
    entry_ref midiRef;
    get_ref_for_path(filename.c_str(), &midiRef);
    if (this->midi_synth_file->LoadFile(&midiRef) == B_OK) {
      this->midi_synth_file->SetVolume(this->current_volume);
      this->midi_synth_file->Start();
      this->just_started = true;
    } else {
      this->Stop();
    }
  }
}
 
void MusicDriver_BeMidi::StopSong()
{
  /* Reusing BMidiSynthFile can cause stuck notes when switching
   * tracks, just delete whole object entirely. */
  delete this->midi_synth_file;
  this->midi_synth_file = nullptr;
}
 
bool MusicDriver_BeMidi::IsSongPlaying()
{
  if (this->midi_synth_file == nullptr) return false;
 
  /* IsFinished() returns true for a moment after Start()
   * but before it really starts playing, use just_started flag
   * to prevent accidental track skipping. */
  if (this->just_started) {
    if (!this->midi_synth_file->IsFinished()) this->just_started = false;
    return true;
  }
  return !this->midi_synth_file->IsFinished();
}
 
void MusicDriver_BeMidi::SetVolume(uint8_t vol)
{
  this->current_volume = vol / 128.0;
  if (this->midi_synth_file != nullptr) this->midi_synth_file->SetVolume(this->current_volume);
}