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/* -*- 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 "FFmpegRuntimeLinker.h"
#include "mozilla/ArrayUtils.h"
#include "FFmpegLog.h"
#include "prlink.h"
namespace mozilla
{
FFmpegRuntimeLinker::LinkStatus FFmpegRuntimeLinker::sLinkStatus =
LinkStatus_INIT;
template <int V> class FFmpegDecoderModule
{
public:
static already_AddRefed<PlatformDecoderModule> Create();
};
static const char* sLibs[] = {
#if defined(XP_DARWIN)
"libavcodec.58.dylib",
"libavcodec.57.dylib",
"libavcodec.56.dylib",
"libavcodec.55.dylib",
"libavcodec.54.dylib",
"libavcodec.53.dylib",
#else
"libavcodec.so.58",
"libavcodec-ffmpeg.so.58",
"libavcodec-ffmpeg.so.57",
"libavcodec-ffmpeg.so.56",
"libavcodec.so.57",
"libavcodec.so.56",
"libavcodec.so.55",
"libavcodec.so.54",
"libavcodec.so.53",
#endif
};
PRLibrary* FFmpegRuntimeLinker::sLinkedLib = nullptr;
const char* FFmpegRuntimeLinker::sLib = nullptr;
static unsigned (*avcodec_version)() = nullptr;
#define AV_FUNC(func, ver) void (*func)();
#define LIBAVCODEC_ALLVERSION
#include "FFmpegFunctionList.h"
#undef LIBAVCODEC_ALLVERSION
#undef AV_FUNC
/* static */ bool
FFmpegRuntimeLinker::Link()
{
if (sLinkStatus) {
return sLinkStatus == LinkStatus_SUCCEEDED;
}
MOZ_ASSERT(NS_IsMainThread());
for (size_t i = 0; i < ArrayLength(sLibs); i++) {
const char* lib = sLibs[i];
PRLibSpec lspec;
lspec.type = PR_LibSpec_Pathname;
lspec.value.pathname = lib;
sLinkedLib = PR_LoadLibraryWithFlags(lspec, PR_LD_NOW | PR_LD_LOCAL);
if (sLinkedLib) {
if (Bind(lib)) {
sLib = lib;
sLinkStatus = LinkStatus_SUCCEEDED;
return true;
}
// Shouldn't happen but if it does then we try the next lib..
Unlink();
}
}
FFMPEG_LOG("H264/AAC codecs unsupported without [");
for (size_t i = 0; i < ArrayLength(sLibs); i++) {
FFMPEG_LOG("%s %s", i ? "," : " ", sLibs[i]);
}
FFMPEG_LOG(" ]\n");
Unlink();
sLinkStatus = LinkStatus_FAILED;
return false;
}
/* static */ bool
FFmpegRuntimeLinker::Bind(const char* aLibName)
{
avcodec_version = (typeof(avcodec_version))PR_FindSymbol(sLinkedLib,
"avcodec_version");
uint32_t fullVersion, major, minor, micro;
fullVersion = GetVersion(major, minor, micro);
if (!fullVersion) {
return false;
}
if (micro < 100 &&
fullVersion < (54u << 16 | 35u << 8 | 1u) &&
!Preferences::GetBool("media.libavcodec.allow-obsolete", false)) {
// Refuse any libavcodec version prior to 54.35.1.
// (Unless media.libavcodec.allow-obsolete==true)
Unlink();
return false;
}
int version;
switch (major) {
case 53:
version = AV_FUNC_53;
break;
case 54:
version = AV_FUNC_54;
break;
case 56:
// We use libavcodec 55 code instead. Fallback.
case 55:
version = AV_FUNC_55;
break;
case 57:
if (micro < 100) {
// A micro version >= 100 indicates that it's FFmpeg (as opposed to LibAV).
// Due to current AVCodecContext binary incompatibility we can only
// support FFmpeg at this point.
return false;
}
version = AV_FUNC_57;
break;
case 58:
if (micro < 100) {
// A micro version >= 100 indicates that it's FFmpeg (as opposed to LibAV).
// Due to current AVCodecContext binary incompatibility we can only
// support FFmpeg at this point.
return false;
}
version = AV_FUNC_58;
break;
default:
// Not supported at this stage.
return false;
}
#define LIBAVCODEC_ALLVERSION
#define AV_FUNC(func, ver) \
if ((ver) & version) { \
if (!(func = (typeof(func))PR_FindSymbol(sLinkedLib, #func))) { \
FFMPEG_LOG("Couldn't load function " #func " from %s.", aLibName); \
return false; \
} \
} else { \
func = (typeof(func))nullptr; \
}
#include "FFmpegFunctionList.h"
#undef AV_FUNC
#undef LIBAVCODEC_ALLVERSION
return true;
}
/* static */ already_AddRefed<PlatformDecoderModule>
FFmpegRuntimeLinker::CreateDecoderModule()
{
if (!Link()) {
return nullptr;
}
uint32_t major, minor, micro;
if (!GetVersion(major, minor, micro)) {
return nullptr;
}
nsRefPtr<PlatformDecoderModule> module;
switch (major) {
case 53: module = FFmpegDecoderModule<53>::Create(); break;
case 54: module = FFmpegDecoderModule<54>::Create(); break;
case 55:
case 56: module = FFmpegDecoderModule<55>::Create(); break;
case 57: module = FFmpegDecoderModule<57>::Create(); break;
case 58: module = FFmpegDecoderModule<58>::Create(); break;
default: module = nullptr;
}
return module.forget();
}
/* static */ void
FFmpegRuntimeLinker::Unlink()
{
if (sLinkedLib) {
PR_UnloadLibrary(sLinkedLib);
sLinkedLib = nullptr;
sLib = nullptr;
sLinkStatus = LinkStatus_INIT;
avcodec_version = nullptr;
}
}
/* static */ uint32_t
FFmpegRuntimeLinker::GetVersion(uint32_t& aMajor, uint32_t& aMinor, uint32_t& aMicro)
{
if (!avcodec_version) {
return 0u;
}
uint32_t version = avcodec_version();
aMajor = (version >> 16) & 0xff;
aMinor = (version >> 8) & 0xff;
aMicro = version & 0xff;
return version;
}
} // namespace mozilla
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