Fast file renderer for non-realtime MIDI file rendering

fluid_settings_t* settings;
fluid_synth_t* synth;
fluid_player_t* player;
fluid_file_renderer_t* renderer;

settings = new_fluid_settings();

// specify the file to store the audio to
// make sure you compiled fluidsynth with libsndfile to get a real wave file
// otherwise this file will only contain raw s16 stereo PCM
fluid_settings_setstr(settings, "audio.file.name", "/path/to/output.wav");

// use number of samples processed as timing source, rather than the system timer
fluid_settings_setstr(settings, "player.timing-source", "sample");

// since this is a non-realtime scenario, there is no need to pin the sample data
fluid_settings_setint(settings, "synth.lock-memory", 0);

synth = new_fluid_synth(settings);

// *** loading of a soundfont omitted ***

player = new_fluid_player(synth);
fluid_player_add(player, "/path/to/midifile.mid");
fluid_player_play(player);

renderer = new_fluid_file_renderer (synth);

while (fluid_player_get_status(player) == FLUID_PLAYER_PLAYING)
{
    if (fluid_file_renderer_process_block(renderer) != FLUID_OK)
    {
        break;
    }
}

// just for sure: stop the playback explicitly and wait until finished
fluid_player_stop(player);
fluid_player_join(player);

delete_fluid_file_renderer(renderer);
delete_fluid_player(player);
delete_fluid_synth(synth);
delete_fluid_settings(settings);