diff --git a/include/decodeParam.h b/include/decodeParam.h
index 6856ce1..c03e679 100644
--- a/include/decodeParam.h
+++ b/include/decodeParam.h
@@ -101,7 +101,6 @@ struct VideoParam
 	int videoStreamIndex;
 
 	bool eof = false;
-
 	bool pause = false;
 	bool quit = false;
 };
@@ -117,6 +116,7 @@ struct AudioParam
 	uint32_t bufferIndex = 0;
 	bool eof = false;
 	bool pause = false;
+	bool isVideo = false;
 	bool quit = false;
 };
 
diff --git a/main.cc b/main.cc
index 210d5b4..74bebb5 100644
--- a/main.cc
+++ b/main.cc
@@ -24,9 +24,12 @@ struct OpenglVideoParam
 
 int InitAudio(SDL_Window* window, SDL_Renderer* renderer, const char* targetFilePath, MediaParam& param)
 {
-	InitDecoder(targetFilePath, param);
-	window = SDL_CreateWindow("mp", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
-	renderer= SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+	if (!param.audioParam.isVideo)
+	{
+		InitDecoder(targetFilePath, param);
+		window = SDL_CreateWindow("mp", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
+		renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
+	}
 	std::jthread(RequestAudioPacket, std::ref(param)).detach();
 	SDL_AudioSpec des;
 	des.freq = param.audioParam.codecCtx->sample_rate;
@@ -34,7 +37,7 @@ int InitAudio(SDL_Window* window, SDL_Renderer* renderer, const char* targetFile
 	des.format = AUDIO_S16SYS;
 	des.samples = 1024;
 	des.silence = 0;
-	std::tuple<SDL_Window*, SDL_Renderer*, AudioParam*>* callbackParam = new std::tuple{window, renderer, &(param.audioParam)};
+	std::tuple<SDL_Window*, SDL_Renderer*, AudioParam*>* callbackParam = new std::tuple{ window, renderer, &(param.audioParam) };
 	des.userdata = callbackParam;
 	des.callback = audioCallback;
 	if (SDL_OpenAudio(&des, nullptr) < 0)
@@ -49,6 +52,8 @@ int InitAudio(SDL_Window* window, SDL_Renderer* renderer, const char* targetFile
 int InitVideo(SDL_Window*& window, const char* targetFilepath, MediaParam& param, OpenglVideoParam& openglVideoParam, ShaderService*& shaderService)
 {
 	InitDecoder(targetFilepath, param);
+	param.audioParam.isVideo = true;
+	InitAudio(nullptr, nullptr, nullptr, param);
 	//FIX: when app exited, the fmtCtx was freed, so need notify decode thread to stop decode and exit.
 	std::jthread(RequestVideoPacket, std::ref(param)).detach();
 	std::jthread(RequestVideoFrame, std::ref(param)).detach();
diff --git a/src/audioDecoder.cc b/src/audioDecoder.cc
index 273950b..410eae0 100644
--- a/src/audioDecoder.cc
+++ b/src/audioDecoder.cc
@@ -71,26 +71,14 @@ int RequestAudioFrame(AudioParam& param, uint8_t* audioBuffer, int bufSize, SDL_
 	const int nb = swr_convert(swrCtx, &audioBuffer, static_cast<int>(dstNbSamples), const_cast<const uint8_t**>(frame->data), frame->nb_samples);
 	dataSize = frame->ch_layout.nb_channels * nb * av_get_bytes_per_sample(dstFormat);
 
-	//render wave
-	int nbSamples = frame->nb_samples;
-	fftw_complex* in = static_cast<fftw_complex*>(fftw_malloc(sizeof(fftw_complex) * nbSamples));
-	fftw_complex* out = static_cast<fftw_complex*>(fftw_malloc(sizeof(fftw_complex) * nbSamples));
-
-	for(int i= 0; i < nbSamples; i++) {
-		in[i][0] = frame->data[0][i];
-		in[i][1] = 0;
-	}
-
-	fftw_plan p = fftw_plan_dft_1d(nbSamples, in, out, FFTW_FORWARD, FFTW_ESTIMATE);
-	fftw_execute(p);
-	fftw_destroy_plan(p);
 	//TODO: render wave
-
-	SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xff);
-	SDL_RenderClear(renderer);
-	SDL_SetRenderDrawColor(renderer, 0xff, 0xff, 0xff, 0xff);
-	SDL_RenderDrawLine(renderer, 0, 0, 300, 300);
-	SDL_RenderPresent(renderer);
+	if (!param.isVideo) {
+		SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xff);
+		SDL_RenderClear(renderer);
+		SDL_SetRenderDrawColor(renderer, 0xff, 0xff, 0xff, 0xff);
+		SDL_RenderDrawLine(renderer, 0, 0, 300, 300);
+		SDL_RenderPresent(renderer);
+	}
 	av_frame_free(&frame);
 	swr_free(&swrCtx);
 	return dataSize;