import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/media/platforms/ffmpeg/ffvpx/FFVPXRuntimeLinker.cpp

@@ -0,0 +1,113 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FFVPXRuntimeLinker.h"
+#include "FFmpegLibWrapper.h"
+#include "FFmpegLog.h"
+#include "nsIFile.h"
+#include "prmem.h"
+#include "prlink.h"
+
+// We use a known symbol located in lgpllibs to determine its location.
+// soundtouch happens to be always included in lgpllibs
+#include "soundtouch/SoundTouch.h"
+
+namespace mozilla
+{
+
+template <int V> class FFmpegDecoderModule
+{
+public:
+  static already_AddRefed<PlatformDecoderModule> Create(FFmpegLibWrapper*);
+};
+
+static FFmpegLibWrapper sFFVPXLib;
+
+FFVPXRuntimeLinker::LinkStatus FFVPXRuntimeLinker::sLinkStatus =
+  LinkStatus_INIT;
+
+static PRLibrary*
+MozAVLink(const char* aName)
+{
+  PRLibSpec lspec;
+  lspec.type = PR_LibSpec_Pathname;
+  lspec.value.pathname = aName;
+  PRLibrary* lib = PR_LoadLibraryWithFlags(lspec, PR_LD_NOW | PR_LD_LOCAL);
+  if (!lib) {
+    FFMPEG_LOG("unable to load library %s", aName);
+  }
+  return lib;
+}
+
+/* static */ bool
+FFVPXRuntimeLinker::Init()
+{
+  if (sLinkStatus) {
+    return sLinkStatus == LinkStatus_SUCCEEDED;
+  }
+
+  sLinkStatus = LinkStatus_FAILED;
+
+  // We retrieve the path of the lgpllibs library as this is where mozavcodec
+  // and mozavutil libs are located.
+  char* lgpllibsname = PR_GetLibraryName(nullptr, "lgpllibs");
+  if (!lgpllibsname) {
+    return false;
+  }
+  char* path =
+    PR_GetLibraryFilePathname(lgpllibsname,
+                              (PRFuncPtr)&soundtouch::SoundTouch::getVersionId);
+  PR_FreeLibraryName(lgpllibsname);
+  if (!path) {
+    return false;
+  }
+  nsCOMPtr<nsIFile> xulFile = do_CreateInstance(NS_LOCAL_FILE_CONTRACTID);
+  if (!xulFile ||
+      NS_FAILED(xulFile->InitWithNativePath(nsDependentCString(path)))) {
+    PR_Free(path);
+    return false;
+  }
+  PR_Free(path);
+
+  nsCOMPtr<nsIFile> rootDir;
+  if (NS_FAILED(xulFile->GetParent(getter_AddRefs(rootDir))) || !rootDir) {
+    return false;
+  }
+  nsAutoCString rootPath;
+  if (NS_FAILED(rootDir->GetNativePath(rootPath))) {
+    return false;
+  }
+
+  char* libname = NULL;
+  /* Get the platform-dependent library name of the module */
+  libname = PR_GetLibraryName(rootPath.get(), "mozavutil");
+  if (!libname) {
+    return false;
+  }
+  sFFVPXLib.mAVUtilLib = MozAVLink(libname);
+  PR_FreeLibraryName(libname);
+  libname = PR_GetLibraryName(rootPath.get(), "mozavcodec");
+  if (libname) {
+    sFFVPXLib.mAVCodecLib = MozAVLink(libname);
+    PR_FreeLibraryName(libname);
+  }
+  if (sFFVPXLib.Link() == FFmpegLibWrapper::LinkResult::Success) {
+    sLinkStatus = LinkStatus_SUCCEEDED;
+    return true;
+  }
+  return false;
+}
+
+/* static */ already_AddRefed<PlatformDecoderModule>
+FFVPXRuntimeLinker::CreateDecoderModule()
+{
+  if (!Init()) {
+    return nullptr;
+  }
+  return FFmpegDecoderModule<FFVPX_VERSION>::Create(&sFFVPXLib);
+}
+
+} // namespace mozilla