The Tor Browser: content/media/plugins/MediaPluginHost.cpp@44a2da4a2ab2 (annotated)

content/media/plugins/MediaPluginHost.cpp@44a2da4a2ab2 (annotated)

content/media/plugins/MediaPluginHost.cpp

Fri, 16 Jan 2015 04:50:19 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 04:50:19 +0100
branch: TOR_BUG_9701
changeset 13: 44a2da4a2ab2
permissions: -rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

 /* -*- 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 "mozilla/Preferences.h"
 #include "mozilla/dom/TimeRanges.h"
 #include "MediaResource.h"
 #include "mozilla/dom/HTMLMediaElement.h"
 #include "MediaPluginHost.h"
 #include "nsXPCOMStrings.h"
 #include "nsISeekableStream.h"
 #include "MediaPluginReader.h"
 #include "nsIGfxInfo.h"
 #include "gfxCrashReporterUtils.h"
 #include "prmem.h"
 #include "prlink.h"
 #include "MediaResourceServer.h"
 #include "nsServiceManagerUtils.h"
 #include "MPAPI.h"
 #include "nsIPropertyBag2.h"
 #if defined(ANDROID) || defined(MOZ_WIDGET_GONK)
 #include "android/log.h"
 #define ALOG(args...)  __android_log_print(ANDROID_LOG_INFO, "MediaPluginHost" , ## args)
 #else
 #define ALOG(args...) /* do nothing */
 #endif
 using namespace MPAPI;
 Decoder::Decoder() :
   mResource(nullptr), mPrivate(nullptr)
 {
 }
 namespace mozilla {
 static char* GetResource(Decoder *aDecoder)
 {
   return static_cast<char*>(aDecoder->mResource);
 }
 class GetIntPrefEvent : public nsRunnable {
 public:
   GetIntPrefEvent(const char* aPref, int32_t* aResult)
     : mPref(aPref), mResult(aResult) {}
   NS_IMETHOD Run() {
     return Preferences::GetInt(mPref, mResult);
   }
 private:
   const char* mPref;
   int32_t*    mResult;
 };
 static bool GetIntPref(const char* aPref, int32_t* aResult)
 {
   // GetIntPref() is called on the decoder thread, but the Preferences API
   // can only be called on the main thread. Post a runnable and wait.
   NS_ENSURE_TRUE(aPref, false);
   NS_ENSURE_TRUE(aResult, false);
   nsCOMPtr<nsIRunnable> event = new GetIntPrefEvent(aPref, aResult);
   return NS_SUCCEEDED(NS_DispatchToMainThread(event, NS_DISPATCH_SYNC));
 }
 static bool
 GetSystemInfoString(const char *aKey, char *aResult, size_t aResultLength)
 {
   NS_ENSURE_TRUE(aKey, false);
   NS_ENSURE_TRUE(aResult, false);
   nsCOMPtr<nsIPropertyBag2> infoService = do_GetService("@mozilla.org/system-info;1");
   NS_ASSERTION(infoService, "Could not find a system info service");
   nsAutoCString key(aKey);
   nsAutoCString info;
   nsresult rv = infoService->GetPropertyAsACString(NS_ConvertUTF8toUTF16(key),
                                                   info);
   NS_ENSURE_SUCCESS(rv, false);
   strncpy(aResult, info.get(), aResultLength);
   return true;
 }
 static PluginHost sPluginHost = {
   nullptr,
   nullptr,
   nullptr,
   nullptr,
   GetIntPref,
   GetSystemInfoString
 };
 // Return true if Omx decoding is supported on the device. This checks the
 // built in whitelist/blacklist and preferences to see if that is overridden.
 static bool IsOmxSupported()
 {
   bool forceEnabled =
       Preferences::GetBool("stagefright.force-enabled", false);
   bool disabled =
       Preferences::GetBool("stagefright.disabled", false);
   if (disabled) {
     NS_WARNING("XXX stagefright disabled\n");
     return false;
   }
   ScopedGfxFeatureReporter reporter("Stagefright", forceEnabled);
   if (!forceEnabled) {
     nsCOMPtr<nsIGfxInfo> gfxInfo = do_GetService("@mozilla.org/gfx/info;1");
     if (gfxInfo) {
       int32_t status;
       if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_STAGEFRIGHT, &status))) {
         if (status != nsIGfxInfo::FEATURE_NO_INFO) {
           NS_WARNING("XXX stagefright blacklisted\n");
           return false;
         }
       }
     }
   }
   reporter.SetSuccessful();
   return true;
 }
 // Return the name of the shared library that implements Omx based decoding. This varies
 // depending on libstagefright version installed on the device and whether it is B2G vs Android.
 // nullptr is returned if Omx decoding is not supported on the device,
 static const char* GetOmxLibraryName()
 {
 #if defined(ANDROID) && !defined(MOZ_WIDGET_GONK)
   nsCOMPtr<nsIPropertyBag2> infoService = do_GetService("@mozilla.org/system-info;1");
   NS_ASSERTION(infoService, "Could not find a system info service");
   int32_t version;
   nsresult rv = infoService->GetPropertyAsInt32(NS_LITERAL_STRING("version"), &version);
   if (NS_SUCCEEDED(rv)) {
     ALOG("Android Version is: %d", version);
   }
   nsAutoString release_version;
   rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("release_version"), release_version);
   if (NS_SUCCEEDED(rv)) {
     ALOG("Android Release Version is: %s", NS_LossyConvertUTF16toASCII(release_version).get());
   }
   nsAutoString device;
   rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("device"), device);
   if (NS_SUCCEEDED(rv)) {
     ALOG("Android Device is: %s", NS_LossyConvertUTF16toASCII(device).get());
   }
   nsAutoString manufacturer;
   rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("manufacturer"), manufacturer);
   if (NS_SUCCEEDED(rv)) {
     ALOG("Android Manufacturer is: %s", NS_LossyConvertUTF16toASCII(manufacturer).get());
   }
   nsAutoString hardware;
   rv = infoService->GetPropertyAsAString(NS_LITERAL_STRING("hardware"), hardware);
   if (NS_SUCCEEDED(rv)) {
     ALOG("Android Hardware is: %s", NS_LossyConvertUTF16toASCII(hardware).get());
   }
 #endif
   if (!IsOmxSupported())
     return nullptr;
 #if defined(ANDROID) && !defined(MOZ_WIDGET_GONK)
   if (version >= 17) {
     return "libomxpluginkk.so";
   }
   else if (version == 13 || version == 12 || version == 11) {
     return "libomxpluginhc.so";
   }
   else if (version == 10 && release_version >= NS_LITERAL_STRING("2.3.6")) {
     // Gingerbread versions from 2.3.6 and above have a different DataSource
     // layout to those on 2.3.5 and below.
     return "libomxplugingb.so";
   }
   else if (version == 10 && release_version >= NS_LITERAL_STRING("2.3.4") &&
            device.Find("HTC") == 0) {
     // HTC devices running Gingerbread 2.3.4+ (HTC Desire HD, HTC Evo Design, etc) seem to
     // use a newer version of Gingerbread libstagefright than other 2.3.4 devices.
     return "libomxplugingb.so";
   }
   else if (version == 9 || (version == 10 && release_version <= NS_LITERAL_STRING("2.3.5"))) {
     // Gingerbread versions from 2.3.5 and below have a different DataSource
     // than 2.3.6 and above.
     return "libomxplugingb235.so";
   }
   else if (version == 8) {
     // Froyo
     return "libomxpluginfroyo.so";
   }
   else if (version < 8) {
     // Below Froyo not supported
     return nullptr;
   }
   // Ice Cream Sandwich and Jellybean
   return "libomxplugin.so";
 #elif defined(ANDROID) && defined(MOZ_WIDGET_GONK)
   return "libomxplugin.so";
 #else
   return nullptr;
 #endif
 }
 MediaPluginHost::MediaPluginHost() {
   MOZ_COUNT_CTOR(MediaPluginHost);
   mResourceServer = MediaResourceServer::Start();
   const char* name = GetOmxLibraryName();
   ALOG("Loading OMX Plugin: %s", name ? name : "nullptr");
   if (name) {
     char *path = PR_GetLibraryFilePathname("libxul.so", (PRFuncPtr) GetOmxLibraryName);
     PRLibrary *lib = nullptr;
     if (path) {
       nsAutoCString libpath(path);
       PR_Free(path);
       int32_t slash = libpath.RFindChar('/');
       if (slash != kNotFound) {
         libpath.Truncate(slash + 1);
         libpath.Append(name);
         lib = PR_LoadLibrary(libpath.get());
       }
     }
     if (!lib)
       lib = PR_LoadLibrary(name);
     if (lib) {
       Manifest *manifest = static_cast<Manifest *>(PR_FindSymbol(lib, "MPAPI_MANIFEST"));
       if (manifest) {
         mPlugins.AppendElement(manifest);
         ALOG("OMX plugin successfully loaded");
      }
     }
   }
 }
 MediaPluginHost::~MediaPluginHost() {
   mResourceServer->Stop();
   MOZ_COUNT_DTOR(MediaPluginHost);
 }
 bool MediaPluginHost::FindDecoder(const nsACString& aMimeType, const char* const** aCodecs)
 {
   const char *chars;
   size_t len = NS_CStringGetData(aMimeType, &chars, nullptr);
   for (size_t n = 0; n < mPlugins.Length(); ++n) {
     Manifest *plugin = mPlugins[n];
     const char* const *codecs;
     if (plugin->CanDecode(chars, len, &codecs)) {
       if (aCodecs)
         *aCodecs = codecs;
       return true;
     }
   }
   return false;
 }
 MPAPI::Decoder *MediaPluginHost::CreateDecoder(MediaResource *aResource, const nsACString& aMimeType)
 {
   NS_ENSURE_TRUE(aResource, nullptr);
   nsAutoPtr<Decoder> decoder(new Decoder());
   if (!decoder) {
     return nullptr;
   }
   const char *chars;
   size_t len = NS_CStringGetData(aMimeType, &chars, nullptr);
   for (size_t n = 0; n < mPlugins.Length(); ++n) {
     Manifest *plugin = mPlugins[n];
     const char* const *codecs;
     if (!plugin->CanDecode(chars, len, &codecs)) {
       continue;
     }
     nsCString url;
     nsresult rv = mResourceServer->AddResource(aResource, url);
     if (NS_FAILED (rv)) continue;
     decoder->mResource = strdup(url.get());
     if (plugin->CreateDecoder(&sPluginHost, decoder, chars, len)) {
       aResource->AddRef();
       return decoder.forget();
     }
   }
   return nullptr;
 }
 void MediaPluginHost::DestroyDecoder(Decoder *aDecoder)
 {
   aDecoder->DestroyDecoder(aDecoder);
   char* resource = GetResource(aDecoder);
   if (resource) {
     // resource *shouldn't* be null, but check anyway just in case the plugin
     // decoder does something stupid.
     mResourceServer->RemoveResource(nsCString(resource));
     free(resource);
   }
   delete aDecoder;
 }
 MediaPluginHost *sMediaPluginHost = nullptr;
 MediaPluginHost *GetMediaPluginHost()
 {
   if (!sMediaPluginHost) {
     sMediaPluginHost = new MediaPluginHost();
   }
   return sMediaPluginHost;
 }
 void MediaPluginHost::Shutdown()
 {
   delete sMediaPluginHost;
   sMediaPluginHost = nullptr;
 }
 } // namespace mozilla

The Tor Browser / annotate

content/media/plugins/MediaPluginHost.cpp@44a2da4a2ab2 (annotated)

content/media/plugins/MediaPluginHost.cpp