Method PlayOnChannel

src/audio_generic.cpp:220–279

}

bool GenericAudio::PlayOnChannel(BgmChannel& chan, Filesystem_Stream::InputStream filestream, int volume, int pitch, int fadein) {
	chan.paused = true; // Pause channel so the audio thread doesn't work on it
	chan.stopped = false; // Unstop channel so the audio thread doesn't delete it

	if (!filestream) {
		Output::Warning("BGM file not readable: {}", filestream.GetName());
		return false;
	}

	// Midiout is only supported on channel 0 because this is an exclusive resource
	if (chan.id == 0 && GenericAudioMidiOut::IsSupported(filestream)) {
		chan.decoder.reset();

		// Order is Fluidsynth, WildMidi, Native, FmMidi
		bool fluidsynth = Audio().GetFluidsynthEnabled() && MidiDecoder::CreateFluidsynth(true);
		bool wildmidi = Audio().GetWildMidiEnabled() && MidiDecoder::CreateWildMidi(true);

		if (!fluidsynth && !wildmidi && Audio().GetNativeMidiEnabled()) {
			CreateAndGetMidiOut();

			if (midi_thread) {
				midi_thread->LockMutex();
				auto &midi_out = midi_thread->GetMidiOut();
				if (midi_out.Open(std::move(filestream))) {
					midi_out.SetPitch(pitch);
					midi_out.SetVolume(0);
					midi_out.SetFade(volume, std::chrono::milliseconds(fadein));
					midi_out.SetLooping(true);
					midi_out.Resume();
					chan.paused = false;
					chan.midi_out_used = true;
					midi_thread->UnlockMutex();
					return true;
				}
				midi_thread->UnlockMutex();
			}
		}
	}

	if (midi_thread) {
		midi_thread->GetMidiOut().Reset();
	}

	chan.decoder = AudioDecoder::Create(filestream);
	chan.midi_out_used = false;
	if (chan.decoder && chan.decoder->Open(std::move(filestream))) {
		chan.decoder->SetPitch(pitch);
		chan.decoder->SetFormat(output_format.frequency, output_format.format, output_format.channels);
		chan.decoder->SetVolume(0);
		chan.decoder->SetFade(volume, std::chrono::milliseconds(fadein));
		chan.decoder->SetLooping(true);
		chan.paused = false; // Unpause channel -> Play it.

		return true;
	} else {
		Output::Warning("Couldn't play BGM {}. Format not supported", filestream.GetName());
	}