Multiple improvements to streaming reliability

src/GodotObs.cpp

@@ -1,17 +1,13 @@
 #include "GodotObs.h"
-
 #include <godot_cpp/variant/utility_functions.hpp>
-
 #include <Windows.h>
-#include "platform/win32/capture_window.h"
-
-//#define PROFILER_ENABLED
-
 #include <chrono>
 
 #pragma comment(lib, "User32.lib")
 #pragma comment(lib, "Gdi32.lib")
 
+//#define PROFILER_ENABLED
+
 namespace godot {
 
 namespace {
@@ -65,41 +61,46 @@ Obs::Obs()
   m_cfg.g_w = 1920;
   m_cfg.g_h = 1080;
   m_cfg.rc_target_bitrate = 1500;
-  m_cfg.g_timebase.num = 1; // TODO: remove?
+  m_cfg.g_timebase.num = 1000;
-  m_cfg.g_timebase.den = 30; // TODO: expose
+  m_cfg.g_timebase.den = 30001;
   m_cfg.g_lag_in_frames = 0;
-  m_cfg.g_threads = 4;
+  m_cfg.g_threads = 8;
   //m_cfg.g_error_resilient = VPX_ERROR_RESILIENT_DEFAULT;
-  //m_cfg.g_timebase = (1000.f / 30000.0);
+  m_cfg.g_pass = VPX_RC_ONE_PASS; // TODO: consider doing two-pass
+  m_cfg.kf_max_dist = 1; // Currently necessary because of WebRTC buffer limitations
+  m_cfg.kf_min_dist = 1; // Maybe we should split data that being sent through rpc?
 
   res = vpx_codec_enc_init(&m_encoder, vpx_codec_vp9_cx(), &m_cfg, 0);
   ERR_FAIL_COND_MSG(res != VPX_CODEC_OK, "VP9 could not be initialized");
 
   vpx_codec_control(&m_encoder, VP8E_SET_CPUUSED, 13);
 
-  // decoder initialize
   res = vpx_codec_dec_init(&m_decoder, vpx_codec_vp9_dx(), nullptr, 0);
   ERR_FAIL_COND_MSG(res != VPX_CODEC_OK, "Could not intitialize decoder");
 
-  m_imageBuffer = Image::create(1920, 1080, false, godot::Image::FORMAT_RGB8);
+  m_imageBuffer = Image::create(1920, 1080, false, godot::Image::FORMAT_RGB8); // TODO: adjust resolution
 }
 
 Obs::~Obs()
 {
-
+  // TODO: cleanup
 }
 
 
 PackedByteArray Obs::getEncodedScreenFrame(size_t id)
 {
+#ifdef PROFILER_ENABLED
   const auto start = std::chrono::high_resolution_clock::now();
+#endif
 
   vpx_codec_err_t res{};
-  auto capturer = microtaur::WindowCapturer{};
-  auto frame = capturer.capture(id);
-
   ERR_FAIL_COND_V_MSG(!&m_encoder, {}, "VP9 encoder is not initialized");
 
+  auto frame = m_capturer.capture(id);
+  if (frame.data.empty()) {
+    return {};
+  }
+
   vpx_image_t img;
   vpx_img_wrap(&img, VPX_IMG_FMT_I420, 1920, 1080, 1, frame.data.data());
 
@@ -112,7 +113,6 @@ PackedByteArray Obs::getEncodedScreenFrame(size_t id)
   PackedByteArray out;
   while ((pkt = vpx_codec_get_cx_data(&m_encoder, &iter))) {
     if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
-
       out.resize(pkt->data.frame.sz);
       std::memcpy(&out[0], pkt->data.frame.buf, pkt->data.frame.sz);
 
@@ -141,7 +141,9 @@ void Obs::renderFrameToMesh(PackedByteArray frame, Ref<StandardMaterial3D> mat)
 
   vpx_codec_err_t res{};
   res = vpx_codec_decode(&m_decoder, (const uint8_t*)&frame[0], frame.size(), NULL, 0);
-  ERR_FAIL_COND_MSG(res != VPX_CODEC_OK, "VP9 decode failed");
+  if (res != VPX_CODEC_OK) {
+    return;
+  }
 
   vpx_codec_iter_t iter = NULL;
   vpx_image_t* img = NULL;
@@ -156,6 +158,7 @@ void Obs::renderFrameToMesh(PackedByteArray frame, Ref<StandardMaterial3D> mat)
     }
 
     mat->set_texture(godot::StandardMaterial3D::TEXTURE_ALBEDO, m_imageTexture);
+  }
 
 #ifdef PROFILER_ENABLED
   auto end = std::chrono::high_resolution_clock::now();
@@ -168,6 +171,5 @@ void Obs::renderFrameToMesh(PackedByteArray frame, Ref<StandardMaterial3D> mat)
   }
 #endif
 }
-}
 
 }

src/GodotObs.h

@@ -13,6 +13,8 @@
 #include <vpx/vpx_decoder.h>
 #include <vpx/vpx_codec.h>
 
+#include "platform/win32/capture_window.h"
+
 namespace godot {
 
 class Obs : public Node
@@ -43,6 +45,7 @@ private:
 	Ref<Image> m_imageBuffer{};
 	Ref<ImageTexture> m_imageTexture{};
 
+	// TODO: create proper profiler
 	size_t m_avgEncodeTime{};
 	size_t m_encodeCount{};
 	size_t m_totalEncodeTime{};
@@ -50,6 +53,8 @@ private:
 	size_t m_avgDecodeTime{};
 	size_t m_decodeCount{};
 	size_t m_totalDecodeTime{};
+
+	microtaur::WindowCapturer m_capturer{};
 };
 
 }

src/platform/win32/capture_window.cpp

@@ -2,6 +2,9 @@
 #include <godot_cpp/variant/utility_functions.hpp>
 
 #include <chrono>
+#include <thread>
+#include <iomanip>
+#include <sstream>
 
 #include <d3d11.h>
 #include <dxgi1_2.h>
@@ -98,11 +101,14 @@ public:
 
     HRESULT hr = m_duplication->AcquireNextFrame(INFINITE, &frameInfo, &desktopResource);
     if (FAILED(hr)) {
-      if (hr == DXGI_ERROR_ACCESS_LOST) {
+      if (hr == DXGI_ERROR_WAIT_TIMEOUT) {
-        // TODO
+        // TODO: maybe adjust this value?
+        std::this_thread::sleep_for(std::chrono::milliseconds(33));
+        return {};
       }
 
-      return {};
+      reset();
+      return { m_width, m_height, m_buffer };
     }
     m_frameAcquired = true;
 
@@ -211,7 +217,16 @@ public:
 
   void reset()
   {
-    // TODO: cleanup
+    m_stagingTexture.Reset();
+    m_desktopTexture.Reset();
+    m_duplication.Reset();
+    m_context.Reset();
+    m_device.Reset();
+
+    m_width = m_height = 0;
+    m_frameAcquired = false;
+
+    init();
   }
 
 private: