我对音乐技术很陌生,所以请耐心等待。
一个 MIDI 文件中有 16 个通道。我正在尝试仅将 1 个通道从 midi 文件转换为 wav。
这是它现在的工作方式:
extern "C" JNIEXPORT void JNICALL Java_com_test_MainActivity_convertMidiToWav(JNIEnv* env, jobject, jstring jSoundfontPath, jstring jOutputWavPath, jstring jMidiPath, jint jChannel) {
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
const char* outputWavPath = env->GetStringUTFChars(jOutputWavPath, nullptr);
fluid_settings_setstr(settings, "audio.file.name", outputWavPath);
// 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);
// set basic channel
fluid_synth_reset_basic_channel(synth, -1);
fluid_synth_set_basic_channel(synth, jChannel, FLUID_CHANNEL_MODE_OMNION_MONO, 1);
// Load sample soundfont
const char* soundfontPath = env->GetStringUTFChars(jSoundfontPath, nullptr);
fluid_synth_sfload(synth, soundfontPath, 1);
const char* midiPath = env->GetStringUTFChars(jMidiPath, nullptr);
player = new_fluid_player(synth);
fluid_player_add(player, midiPath);
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);
}
注意这两行:
fluid_synth_reset_basic_channel(synth, -1);
fluid_synth_set_basic_channel(synth, jChannel, FLUID_CHANNEL_MODE_OMNION_MONO, 1);
jChannel
是 MIDI 通道编号(1-16)。我不确定我是否做得对。
有人能告诉我如何将 1 个 midi 通道转换为 wav 吗?上面的代码是否转换了单个通道?
提前致谢