media/base/media_win.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/base/media.h"
   6
   7 #include <windows.h>
   8 #if defined(_WIN32_WINNT_WIN8)
   9 // The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h.
  10 #undef FACILITY_VISUALCPP
  11 #endif
  12 #include <delayimp.h>
  13
  14 #include "base/files/file_path.h"
  15 #include "base/metrics/sparse_histogram.h"
  16 #include "media/ffmpeg/ffmpeg_common.h"
  17
  18 #pragma comment(lib, "delayimp.lib")
  19
  20 namespace media {
  21 namespace internal {
  22
  23 bool InitializeMediaLibraryInternal(const base::FilePath& module_dir) {
  24   // LoadLibraryEx(..., LOAD_WITH_ALTERED_SEARCH_PATH) cannot handle
  25   // relative path.
  26   if (!module_dir.IsAbsolute())
  27     return false;
  28
  29   // Use alternate DLL search path so we don't load dependencies from the
  30   // system path.  Refer to http://crbug.com/35857
  31   static const char kFFmpegDLL[] = "ffmpegsumo.dll";
  32   HMODULE lib = ::LoadLibraryEx(
  33       module_dir.AppendASCII(kFFmpegDLL).value().c_str(), NULL,
  34       LOAD_WITH_ALTERED_SEARCH_PATH);
  35
  36   bool initialized = (lib != NULL);
  37
  38   // TODO(scherkus): Remove all the bool-ness from these functions as we no
  39   // longer support disabling HTML5 media at runtime. http://crbug.com/440892
  40   if (!initialized) {
  41     UMA_HISTOGRAM_SPARSE_SLOWLY("Media.Initialize.Windows", GetLastError());
  42     return false;
  43   }
  44
  45   // VS2013 has a bug where FMA3 instructions will be executed on CPUs that
  46   // support them despite them being disabled at the OS level, causing illegal
  47   // instruction exceptions. Because Web Audio's FFT code *might* run before
  48   // HTML5 media code, call av_log_set_level() to force library initialziation.
  49   // See http://crbug.com/440892 for details.
  50   av_log_set_level(AV_LOG_QUIET);
  51
  52   return initialized;
  53 }
  54
  55 }  // namespace internal
  56 }  // namespace media