The Tor Browser: content/media/fmp4/ffmpeg/FFmpegRuntimeLinker.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include <dlfcn.h>

     9 #include "nsDebug.h"

    11 #include "FFmpegRuntimeLinker.h"

    13 // For FFMPEG_LOG

    14 #include "FFmpegDecoderModule.h"

    16 #define NUM_ELEMENTS(X) (sizeof(X) / sizeof((X)[0]))

    18 #define LIBAVCODEC 0

    19 #define LIBAVFORMAT 1

    20 #define LIBAVUTIL 2

    22 namespace mozilla

    23 {

    25 FFmpegRuntimeLinker::LinkStatus FFmpegRuntimeLinker::sLinkStatus =

    26   LinkStatus_INIT;

    28 static const char * const sLibNames[] = {

    29   "libavcodec.so.53", "libavformat.so.53", "libavutil.so.51",

    30 };

    32 void* FFmpegRuntimeLinker::sLinkedLibs[NUM_ELEMENTS(sLibNames)] = {

    33   nullptr, nullptr, nullptr

    34 };

    36 #define AV_FUNC(lib, func) typeof(func) func;

    37 #include "FFmpegFunctionList.h"

    38 #undef AV_FUNC

    40 /* static */ bool

    41 FFmpegRuntimeLinker::Link()

    42 {

    43   if (sLinkStatus) {

    44     return sLinkStatus == LinkStatus_SUCCEEDED;

    45   }

    47   for (uint32_t i = 0; i < NUM_ELEMENTS(sLinkedLibs); i++) {

    48     if (!(sLinkedLibs[i] = dlopen(sLibNames[i], RTLD_NOW | RTLD_LOCAL))) {

    49       NS_WARNING("Couldn't link ffmpeg libraries.");

    50       goto fail;

    51     }

    52   }

    54 #define AV_FUNC(lib, func)                                                     \

    55   func = (typeof(func))dlsym(sLinkedLibs[lib], #func);                         \

    56   if (!func) {                                                                 \

    57     NS_WARNING("Couldn't load FFmpeg function " #func ".");                    \

    58     goto fail;                                                                 \

    59   }

    60 #include "FFmpegFunctionList.h"

    61 #undef AV_FUNC

    63   sLinkStatus = LinkStatus_SUCCEEDED;

    64   return true;

    66 fail:

    67   Unlink();

    69   sLinkStatus = LinkStatus_FAILED;

    70   return false;

    71 }

    73 /* static */ void

    74 FFmpegRuntimeLinker::Unlink()

    75 {

    76   FFMPEG_LOG("Unlinking ffmpeg libraries.");

    77   for (uint32_t i = 0; i < NUM_ELEMENTS(sLinkedLibs); i++) {

    78     if (sLinkedLibs[i]) {

    79       dlclose(sLinkedLibs[i]);

    80       sLinkedLibs[i] = nullptr;

    81     }

    82   }

    83 }

    85 } // namespace mozilla

The Tor Browser / file revision

content/media/fmp4/ffmpeg/FFmpegRuntimeLinker.cpp@97036ab72558

content/media/fmp4/ffmpeg/FFmpegRuntimeLinker.cpp