260 lines
7.6 KiB
C++
260 lines
7.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "FFmpegRuntimeLinker.h"
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#include "mozilla/ArrayUtils.h"
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#include "FFmpegLog.h"
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#include "mozilla/Preferences.h"
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#include "prlink.h"
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#ifdef XP_DARWIN
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#include <dlfcn.h>
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#include <libgen.h>
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#include <mach-o/dyld.h>
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#endif /* XP_DARWIN */
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namespace mozilla
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{
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FFmpegRuntimeLinker::LinkStatus FFmpegRuntimeLinker::sLinkStatus =
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LinkStatus_INIT;
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template <int V> class FFmpegDecoderModule
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{
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public:
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static already_AddRefed<PlatformDecoderModule> Create();
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};
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static const char* sLibs[] = {
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#if defined(XP_DARWIN)
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"libavcodec.57.dylib",
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"libavcodec.56.dylib",
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"libavcodec.55.dylib",
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"libavcodec.54.dylib",
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"libavcodec.53.dylib",
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#else
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"libavcodec-ffmpeg.so.57",
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"libavcodec-ffmpeg.so.56",
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"libavcodec.so.57",
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"libavcodec.so.56",
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"libavcodec.so.55",
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"libavcodec.so.54",
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"libavcodec.so.53",
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#endif
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};
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#ifdef XP_DARWIN
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void* FFmpegRuntimeLinker::sLinkedLib = nullptr;
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#else
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PRLibrary* FFmpegRuntimeLinker::sLinkedLib = nullptr;
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#endif /* XP_DARWIN */
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const char* FFmpegRuntimeLinker::sLib = nullptr;
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static unsigned (*avcodec_version)() = nullptr;
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#define AV_FUNC(func, ver) void (*func)();
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#define LIBAVCODEC_ALLVERSION
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#include "FFmpegFunctionList.h"
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#undef LIBAVCODEC_ALLVERSION
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#undef AV_FUNC
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/* static */ bool
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FFmpegRuntimeLinker::Link()
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{
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if (sLinkStatus) {
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return sLinkStatus == LinkStatus_SUCCEEDED;
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}
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MOZ_ASSERT(NS_IsMainThread());
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#ifdef XP_DARWIN // Explanation below.
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char execPath[PATH_MAX];
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execPath[0] = '\0';
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uint32_t pathlen = PATH_MAX;
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_NSGetExecutablePath(execPath, &pathlen);
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char *execDir = dirname(execPath);
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#endif /* XP_DARWIN */
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for (size_t i = 0; i < ArrayLength(sLibs); i++) {
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const char* lib = sLibs[i];
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#ifdef XP_DARWIN
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/* Loading FFMPEG on Mac OS X (macOS is a typo) fails because mozilla
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searches for sybols defined in libavutil with a handle to libavcodec.
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This is due to the fact that NSPR uses NSAddressOfSymbol & cie who limits
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its researches only to libavcodec and not its dependencies. We don't have
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this issue with dlsym(). */
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if (!(sLinkedLib = dlopen(lib, RTLD_NOW | RTLD_LOCAL))) {
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/* Bonus time: if we don't find libavcodec in standard locations, we look
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if our venerable FFMPEG's libraries are in the same folder as XUL. */
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char *libFullPath = NULL;
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if (asprintf(&libFullPath, "%s/%s", execDir, lib) > 0 && libFullPath)
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sLinkedLib = dlopen(libFullPath, RTLD_NOW | RTLD_LOCAL);
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free(libFullPath);
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}
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#else
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PRLibSpec lspec;
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lspec.type = PR_LibSpec_Pathname;
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lspec.value.pathname = lib;
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sLinkedLib = PR_LoadLibraryWithFlags(lspec, PR_LD_NOW | PR_LD_LOCAL);
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#endif /* XP_DARWIN */
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if (sLinkedLib) {
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if (Bind(lib)) {
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sLib = lib;
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sLinkStatus = LinkStatus_SUCCEEDED;
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return true;
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}
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// Shouldn't happen but if it does then we try the next lib..
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Unlink();
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}
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}
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FFMPEG_LOG("H264/AAC codecs unsupported without [");
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for (size_t i = 0; i < ArrayLength(sLibs); i++) {
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FFMPEG_LOG("%s %s", i ? "," : "", sLibs[i]);
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}
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FFMPEG_LOG(" ]\n");
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Unlink();
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sLinkStatus = LinkStatus_FAILED;
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return false;
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}
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/* static */ bool
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FFmpegRuntimeLinker::Bind(const char* aLibName)
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{
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#ifdef XP_DARWIN
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avcodec_version = (typeof(avcodec_version))dlsym(sLinkedLib,
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#else
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avcodec_version = (typeof(avcodec_version))PR_FindSymbol(sLinkedLib,
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#endif /* XP_DARWIN */
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"avcodec_version");
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uint32_t fullVersion, major, minor, micro;
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fullVersion = GetVersion(major, minor, micro);
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if (!fullVersion) {
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return false;
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}
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if (micro < 100 &&
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fullVersion < (54u << 16 | 35u << 8 | 1u) &&
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!Preferences::GetBool("media.libavcodec.allow-obsolete", false)) {
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// Refuse any libavcodec version prior to 54.35.1.
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// (Unless media.libavcodec.allow-obsolete==true)
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Unlink();
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LogToBrowserConsole(NS_LITERAL_STRING(
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"libavcodec may be vulnerable or is not supported, and should be updated to play video."));
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return false;
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}
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int version;
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switch (major) {
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case 53:
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version = AV_FUNC_53;
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break;
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case 54:
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version = AV_FUNC_54;
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break;
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case 56:
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// We use libavcodec 55 code instead. Fallback
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case 55:
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version = AV_FUNC_55;
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break;
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case 57:
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if (micro < 100) {
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// a micro version >= 100 indicates that it's FFmpeg (as opposed to LibAV).
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// Due to current AVCodecContext binary incompatibility we can only
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// support FFmpeg at this stage.
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return false;
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}
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version = AV_FUNC_57;
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break;
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default:
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// Not supported at this stage.
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return false;
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}
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#define LIBAVCODEC_ALLVERSION
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#ifdef XP_DARWIN
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#define AV_FUNC(func, ver) \
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if ((ver) & version) { \
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if (!(func = (typeof(func))dlsym(sLinkedLib, #func))) { \
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FFMPEG_LOG("Couldn't load function " #func " from %s.", aLibName); \
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return false; \
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} \
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} else { \
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func = (typeof(func))nullptr; \
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}
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#else
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#define AV_FUNC(func, ver) \
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if ((ver) & version) { \
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if (!(func = (typeof(func))PR_FindSymbol(sLinkedLib, #func))) { \
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FFMPEG_LOG("Couldn't load function " #func " from %s.", aLibName); \
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return false; \
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} \
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} else { \
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func = (typeof(func))nullptr; \
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}
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#endif /* XP_DARWIN */
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#include "FFmpegFunctionList.h"
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#undef AV_FUNC
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#undef LIBAVCODEC_ALLVERSION
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return true;
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}
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/* static */ already_AddRefed<PlatformDecoderModule>
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FFmpegRuntimeLinker::CreateDecoderModule()
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{
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if (!Link()) {
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return nullptr;
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}
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uint32_t major, minor, micro;
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if (!GetVersion(major, minor, micro)) {
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return nullptr;
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}
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RefPtr<PlatformDecoderModule> module;
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switch (major) {
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case 53: module = FFmpegDecoderModule<53>::Create(); break;
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case 54: module = FFmpegDecoderModule<54>::Create(); break;
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case 55:
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case 56: module = FFmpegDecoderModule<55>::Create(); break;
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case 57: module = FFmpegDecoderModule<57>::Create(); break;
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default: module = nullptr;
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}
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return module.forget();
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}
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/* static */ void
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FFmpegRuntimeLinker::Unlink()
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{
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if (sLinkedLib) {
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#ifdef XP_DARWIN
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dlclose(sLinkedLib);
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#else
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PR_UnloadLibrary(sLinkedLib);
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#endif /* XP_DARWIN */
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sLinkedLib = nullptr;
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sLib = nullptr;
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sLinkStatus = LinkStatus_INIT;
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avcodec_version = nullptr;
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}
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}
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/* static */ uint32_t
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FFmpegRuntimeLinker::GetVersion(uint32_t& aMajor, uint32_t& aMinor, uint32_t& aMicro)
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{
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if (!avcodec_version) {
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return 0u;
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}
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uint32_t version = avcodec_version();
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aMajor = (version >> 16) & 0xff;
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aMinor = (version >> 8) & 0xff;
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aMicro = version & 0xff;
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return version;
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}
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} // namespace mozilla
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