зеркало из https://github.com/mozilla/gecko-dev.git
128 строки
3.5 KiB
C++
128 строки
3.5 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 <dlfcn.h>
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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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#define NUM_ELEMENTS(X) (sizeof(X) / sizeof((X)[0]))
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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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struct AvFormatLib
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{
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const char* Name;
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already_AddRefed<PlatformDecoderModule> (*Factory)();
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uint32_t Version;
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};
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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 AvFormatLib sLibs[] = {
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{ "libavformat.so.56", FFmpegDecoderModule<55>::Create, 55 },
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{ "libavformat.so.55", FFmpegDecoderModule<55>::Create, 55 },
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{ "libavformat.so.54", FFmpegDecoderModule<54>::Create, 54 },
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{ "libavformat.so.53", FFmpegDecoderModule<53>::Create, 53 },
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{ "libavformat.56.dylib", FFmpegDecoderModule<55>::Create, 55 },
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{ "libavformat.55.dylib", FFmpegDecoderModule<55>::Create, 55 },
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{ "libavformat.54.dylib", FFmpegDecoderModule<54>::Create, 54 },
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{ "libavformat.53.dylib", FFmpegDecoderModule<53>::Create, 53 },
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};
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void* FFmpegRuntimeLinker::sLinkedLib = nullptr;
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const AvFormatLib* FFmpegRuntimeLinker::sLib = 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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for (size_t i = 0; i < ArrayLength(sLibs); i++) {
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const AvFormatLib* lib = &sLibs[i];
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sLinkedLib = dlopen(lib->Name, RTLD_NOW | RTLD_LOCAL);
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if (sLinkedLib) {
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if (Bind(lib->Name, lib->Version)) {
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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].Name);
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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, uint32_t Version)
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{
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#define LIBAVCODEC_ALLVERSION
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#define AV_FUNC(func, ver) \
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if (ver == 0 || 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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}
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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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nsRefPtr<PlatformDecoderModule> module = sLib->Factory();
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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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dlclose(sLinkedLib);
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sLinkedLib = nullptr;
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sLib = nullptr;
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sLinkStatus = LinkStatus_INIT;
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}
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}
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} // namespace mozilla
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