How to use FluidSynth to convert Midi files to PCM or WAV？

[BoyanLiu-Bot]

I want to convert a Midi file to WAV with the following code, but the generated wav file only has a progress bar and no sound when playing, what will be the reason? Or is there any other way to accomplish my function.

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

settings = new_fluid_settings();

// 指定存储音频的文件名
const char *outputWavPath = jOutputWavPath.c_str();
fluid_settings_setstr(settings, "audio.file.name", outputWavPath);

// 非实时场景，不需要锁定内存
fluid_settings_setint(settings, "synth.lock-memory", 0);

synth = new_fluid_synth(settings);

// 加载声音字体
const char *soundfontPath = jSoundfontPath.c_str();
fluid_synth_sfload(synth, soundfontPath, 1);

// 创建播放器并添加 MIDI 文件
const char *midiPath = jMidiPath.c_str();
player = new_fluid_player(synth);
fluid_player_add(player, midiPath);
fluid_player_play(player);

// set basic channel to export
channelToExport = jChannel;
fluid_player_set_playback_callback(player, handle_midi_event, synth);

// 创建文件渲染器并处理音频块
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;
    }
}

OH_LOG_INFO(LOG_APP, "MIDI2WAV ok");

// 停止并等待播放器完成
fluid_player_stop(player);
fluid_player_join(player);

// 清理资源
delete_fluid_file_renderer(renderer);
delete_fluid_player(player);
delete_fluid_synth(synth);
delete_fluid_settings(settings);

[BoyanLiu-Bot]

Please ignore it, it's my usage problem