...

app/src/main/cpp/MediaAsset.cpp

@@ -203,6 +203,13 @@ bool MediaAsset::loadVideoWithFFmpeg(int fd) {
         LOGE("Could not find a video stream");
         release(); return false;
     }
+    AVStream* stream = fmtCtx_->streams[videoStreamIdx_];
+    if (stream->avg_frame_rate.den != 0) {
+        fps_ = av_q2d(stream->avg_frame_rate);
+    } else {
+        fps_ = 30.0; // FPS 정보가 없는 경우 기본값 30
+    }
+    LOGI("Video FPS detected: %f", fps_);
     codecCtx_ = avcodec_alloc_context3(codec);
     if (!codecCtx_ || avcodec_parameters_to_context(codecCtx_, fmtCtx_->streams[videoStreamIdx_]->codecpar) < 0) {
         LOGE("Failed to create codec context");
@@ -244,6 +251,14 @@ bool MediaAsset::loadVideoWithFFmpeg(const std::string& path) {
     const AVCodec* codec = nullptr;
     videoStreamIdx_ = av_find_best_stream(fmtCtx_, AVMEDIA_TYPE_VIDEO, -1, -1, &codec, 0);
     if (videoStreamIdx_ < 0) { release(); return false; }
+    // --- ⬇️ FPS 추출 코드 추가 (동일한 코드) ⬇️ ---
+    AVStream* stream = fmtCtx_->streams[videoStreamIdx_];
+    if (stream->avg_frame_rate.den != 0) {
+        fps_ = av_q2d(stream->avg_frame_rate);
+    } else {
+        fps_ = 30.0;
+    }
+    LOGI("Video FPS detected: %f", fps_);
     codecCtx_ = avcodec_alloc_context3(codec);
     if (!codecCtx_ || avcodec_parameters_to_context(codecCtx_, fmtCtx_->streams[videoStreamIdx_]->codecpar) < 0) { release(); return false; }
     if (avcodec_open2(codecCtx_, codec, nullptr) < 0) { release(); return false; }

app/src/main/cpp/MediaAsset.h

@@ -51,6 +51,7 @@ public:
     AVPacket* getPacket() const { return packet_; }
     SwsContext* getSwsContext() const { return swsCtx_; }
     int getVideoStreamIndex() const { return videoStreamIdx_; }
+    double getFps() const { return fps_; } // <-- FPS getter 추가
 
 private:
     bool loadInternal(const std::string& path);
@@ -72,4 +73,5 @@ private:
     AVPacket* packet_ = nullptr;
     SwsContext* swsCtx_ = nullptr;
     int videoStreamIdx_ = -1;
+    double fps_ = 0.0; // <-- FPS 저장 변수 추가
 };

app/src/main/cpp/Renderer.cpp

@@ -22,7 +22,10 @@ Renderer::Renderer() {
     setAnimationMode(static_cast<int>(AnimationMode::PAN));
     setTransitionMode(static_cast<int>(TransitionMode::FADE));
 }
-Renderer::~Renderer() { release(); }
+Renderer::~Renderer() {
+    stopRenderLoop();
+    release();
+}
 void Renderer::release() { std::lock_guard<std::mutex> lock(renderMutex_); currentMedia_.release(); nextMedia_.release(); }
 void Renderer::setNextMedia(int fd) { preloader_.startNextPreload(fd); }
 void Renderer::setAnimationSpeed(float speed) { animationSpeed_ = speed > 0 ? speed : 1.0f; }
@@ -37,6 +40,48 @@ void Renderer::setTransitionMode(int mode) {
     configuredTransitionMode_ = (mode >= 0 && mode <= static_cast<int>(TransitionMode::MOSAIC)) ? static_cast<TransitionMode>(mode) : TransitionMode::FADE;
 }
 
+void Renderer::startRenderLoop(ANativeWindow* window) {
+    if (isRunning_) return; // 이미 실행 중이면 무시
+
+    nativeWindow_ = window;
+    if (nativeWindow_) {
+        ANativeWindow_acquire(nativeWindow_);
+        isRunning_ = true;
+        renderThread_ = std::thread([this]() {
+            LOGI("C++ Render thread started.");
+            while (isRunning_) {
+                auto frameStartTime = std::chrono::steady_clock::now();
+
+                renderFrame(nativeWindow_); // 기존의 복잡한 renderFrame 함수를 그대로 호출
+
+                auto frameEndTime = std::chrono::steady_clock::now();
+                auto frameDuration = std::chrono::duration_cast<std::chrono::milliseconds>(frameEndTime - frameStartTime);
+
+                // --- ⬇️ 수정: 고정 딜레이 -> 가변 딜레이 ⬇️ ---
+                // 현재 설정된 목표 딜레이(currentFrameDelay_)에 맞춰 대기
+                auto sleepTime = currentFrameDelay_ - frameDuration;
+                if (sleepTime > std::chrono::milliseconds(0)) {
+                    std::this_thread::sleep_for(sleepTime);
+                }
+            }
+            LOGI("C++ Render thread finished.");
+        });
+    }
+}
+
+void Renderer::stopRenderLoop() {
+    if (!isRunning_) return;
+
+    isRunning_ = false;
+    if (renderThread_.joinable()) {
+        renderThread_.join();
+    }
+    if (nativeWindow_) {
+        ANativeWindow_release(nativeWindow_);
+        nativeWindow_ = nullptr;
+    }
+}
+
 void Renderer::determineActiveAnimationMode() {
     AnimationMode modeToSetActive;
     if (configuredAnimationMode_ == AnimationMode::RANDOM) {
@@ -202,6 +247,14 @@ void Renderer::renderFrame(ANativeWindow* window) {
     if (!currentMedia_.isValid() && preloader_.isPreloadedDataReady()) {
         currentMedia_ = preloader_.swapAndRelease();
         if (currentMedia_.isValid()) {
+            // --- ⬇️ 프레임 딜레이 설정 로직 추가 ⬇️ ---
+            if (currentMedia_.getType() == MediaAsset::Type::VIDEO && currentMedia_.getFps() > 0) {
+                currentFrameDelay_ = std::chrono::milliseconds(static_cast<long long>(1000.0 / currentMedia_.getFps()));
+                LOGI("Media type: Video. Frame delay set to %lldms for %.2f FPS", currentFrameDelay_.count(), currentMedia_.getFps());
+            } else {
+                currentFrameDelay_ = std::chrono::milliseconds(33); // 이미지일 경우 30fps
+                LOGI("Media type: Image. Frame delay set to 33ms (~30 FPS)");
+            }
             currentState_ = RenderState::ANIMATING;
             determineActiveAnimationMode();
             if(animationStrategy_) animationStrategy_->reset();

app/src/main/cpp/Renderer.h

@@ -31,6 +31,9 @@ public:
     void release();
     std::string getDebugInfo() const;
 
+    void startRenderLoop(ANativeWindow* window);
+    void stopRenderLoop();
+
     void setAnimationSpeed(float speed);
     void setAnimationMode(int mode);
     void setFadeDuration(int durationMs);
@@ -44,6 +47,11 @@ public:
                                     float& outScale, float& outOffsetX, float& outOffsetY) const;
 
 private:
+
+    std::thread renderThread_;
+    std::atomic<bool> isRunning_{false};
+    ANativeWindow* nativeWindow_ = nullptr;
+
     enum class RenderState { ANIMATING, TRANSITIONING };
     RenderState currentState_ = RenderState::ANIMATING;
 
@@ -66,6 +74,8 @@ private:
     long long fadeDurationMs_ = 3000;
     long long pageTurnDelayMs_ = 5000;
     float animationSpeed_ = 1.0f;
+    // --- ⬇️ 목표 프레임 딜레이 변수 추가 ⬇️ ---
+    std::chrono::milliseconds currentFrameDelay_{33}; // 기본값 33ms (약 30fps)
 
     AnimationState getStartStateForMode(AnimationMode mode, int surfaceWidth, int surfaceHeight);
     AnimationMode predictNextAnimationMode();

app/src/main/cpp/native_renderer.cpp

@@ -74,6 +74,30 @@ Java_bums_lunatic_launcher_wall_NativeRenderer_nativeDestroy(JNIEnv* env, jobjec
     }
 }
 
+
+JNIEXPORT void JNICALL
+Java_bums_lunatic_launcher_wall_NativeRenderer_nativeStopRenderLoop(JNIEnv* env, jobject, jlong nativeHandle) {
+    Renderer* renderer = toNative<Renderer>(nativeHandle);
+    if (renderer) {
+        renderer->stopRenderLoop();
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_bums_lunatic_launcher_wall_NativeRenderer_nativeStartRenderLoop(JNIEnv* env, jobject, jlong nativeHandle, jobject surface) {
+    Renderer* renderer = toNative<Renderer>(nativeHandle);
+    if (!renderer || !surface) return;
+
+    ANativeWindow* window = ANativeWindow_fromSurface(env, surface);
+    if (!window) {
+        LOGE("Could not get ANativeWindow from Surface.");
+        return;
+    }
+    renderer->startRenderLoop(window);
+    ANativeWindow_release(window);
+}
+
+
 // [수정] 모든 함수가 nativeHandle을 첫 파라미터로 받도록 변경
 JNIEXPORT void JNICALL
 Java_bums_lunatic_launcher_wall_NativeRenderer_nativeRender(JNIEnv* env, jobject, jlong nativeHandle, jobject surface) {