Implement VP8 encoder for chromoting

media/base/media_win.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/media.h"
 
 #include <windows.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
+#include "base/native_library.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
 
 // Enable timing code by turning on TESTING macro.
 //#define TESTING 1
 
 #ifdef TESTING
 #include "base/string_util.h"
 #include "base/time.h"
 #endif
@@ skipping 19 matching lines @@
     case FILE_LIBAVUTIL:
       return FILE_PATH_LITERAL("avutil-50.dll");
     default:
       LOG(DFATAL) << "Invalid DLL key requested: " << dll_key;
       return FILE_PATH_LITERAL("");
   }
 }
 
 }  // namespace
 
+// Address of vpx_codec_vp8_cx_algo.
+static void* vp8_cx_algo_address = NULL;
+
 // Attempts to initialize the media library (loading DLLs, DSOs, etc.).
 // Returns true if everything was successfully initialized, false otherwise.
 bool InitializeMediaLibrary(const FilePath& base_path) {
   FFmpegDLLKeys path_keys[] = {
     media::FILE_LIBAVCODEC,
     media::FILE_LIBAVFORMAT,
     media::FILE_LIBAVUTIL
   };
   HMODULE libs[arraysize(path_keys)] = {NULL};
 
@@ skipping 11 matching lines @@
       break;
 #ifdef TESTING
     base::TimeTicks dll_loadtime_end = base::TimeTicks::HighResNow();
     std::wstring outputbuf = StringPrintf(L"DLL loadtime %5.2f ms, %ls\n",
         (dll_loadtime_end - dll_loadtime_start).InMillisecondsF(),
         cpath);
     OutputDebugStringW(outputbuf.c_str());
 #endif
   }
 
+  // TODO(hclam): This is temporary to obtain address of
+  // vpx_codec_vp8_cx_algo. This should be removed once libvpx has a
+  // getter method for it.
+  base::NativeLibrary avcodec_lib =
+      base::LoadNativeLibrary(FilePath(GetDLLName(media::FILE_LIBAVCODEC)));
+  if (avcodec_lib) {
+    vp8_cx_algo_address = base::GetFunctionPointerFromNativeLibrary(
+        avcodec_lib, "vpx_codec_vp8_cx_algo");
+  }
+
   // Check that we loaded all libraries successfully.  We only need to check the
   // last array element because the loop above will break without initializing
   // it on any prior error.
   if (libs[arraysize(libs)-1])
     return true;
 
   // Free any loaded libraries if we weren't successful.
   for (size_t i = 0; i < arraysize(libs) && libs[i] != NULL; ++i) {
     FreeLibrary(libs[i]);
     libs[i] = NULL;  // Just to be safe.
   }
   return false;
 }
 
 bool InitializeOpenMaxLibrary(const FilePath& module_dir) {
   NOTIMPLEMENTED() << "OpenMAX is not used in Windows.";
   return false;
 }
 
+void* GetVp8CxAlgoAddress() {
+  return vp8_cx_algo_address;
+}
+
 }  // namespace media