1 files changed, 199 insertions, 0 deletions
diff --git a/dom/media/platforms/ffmpeg/FFmpegRuntimeLinker.cpp b/dom/media/platforms/ffmpeg/FFmpegRuntimeLinker.cpp
new file mode 100644
index 0000000000..7716162e07
--- /dev/null
+++ b/dom/media/platforms/ffmpeg/FFmpegRuntimeLinker.cpp
@@ -0,0 +1,199 @@
+/* -*- 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 "FFmpegLibWrapper.h"
+#include "mozilla/ArrayUtils.h"
+#include "FFmpegLog.h"
+#include "prlink.h"
+
+namespace mozilla {
+
+FFmpegRuntimeLinker::LinkStatus FFmpegRuntimeLinker::sLinkStatus =
+    LinkStatus_INIT;
+const char* FFmpegRuntimeLinker::sLinkStatusLibraryName = "";
+
+template <int V>
+class FFmpegDecoderModule {
+ public:
+  static already_AddRefed<PlatformDecoderModule> Create(FFmpegLibWrapper*);
+};
+
+static FFmpegLibWrapper sLibAV;
+
+static const char* sLibs[] = {
+// clang-format off
+#if defined(XP_DARWIN)
+  "libavcodec.60.dylib",
+  "libavcodec.59.dylib",
+  "libavcodec.58.dylib",
+  "libavcodec.57.dylib",
+  "libavcodec.56.dylib",
+  "libavcodec.55.dylib",
+  "libavcodec.54.dylib",
+  "libavcodec.53.dylib",
+#elif defined(XP_OPENBSD)
+  "libavcodec.so", // OpenBSD hardly controls the major/minor library version
+                   // of ffmpeg and update it regulary on ABI/API changes
+#else
+  "libavcodec.so.60",
+  "libavcodec.so.59",
+  "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
+    // clang-format on
+};
+
+/* static */
+bool FFmpegRuntimeLinker::Init() {
+  if (sLinkStatus != LinkStatus_INIT) {
+    return sLinkStatus == LinkStatus_SUCCEEDED;
+  }
+
+#ifdef MOZ_WAYLAND
+  sLibAV.LinkVAAPILibs();
+#endif
+
+  // While going through all possible libs, this status will be updated with a
+  // more precise error if possible.
+  sLinkStatus = LinkStatus_NOT_FOUND;
+
+  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;
+    sLibAV.mAVCodecLib =
+        PR_LoadLibraryWithFlags(lspec, PR_LD_NOW | PR_LD_LOCAL);
+    if (sLibAV.mAVCodecLib) {
+      sLibAV.mAVUtilLib = sLibAV.mAVCodecLib;
+      switch (sLibAV.Link()) {
+        case FFmpegLibWrapper::LinkResult::Success:
+          sLinkStatus = LinkStatus_SUCCEEDED;
+          sLinkStatusLibraryName = lib;
+          return true;
+        case FFmpegLibWrapper::LinkResult::NoProvidedLib:
+          MOZ_ASSERT_UNREACHABLE("Incorrectly-setup sLibAV");
+          break;
+        case FFmpegLibWrapper::LinkResult::NoAVCodecVersion:
+          if (sLinkStatus > LinkStatus_INVALID_CANDIDATE) {
+            sLinkStatus = LinkStatus_INVALID_CANDIDATE;
+            sLinkStatusLibraryName = lib;
+          }
+          break;
+        case FFmpegLibWrapper::LinkResult::CannotUseLibAV57:
+          if (sLinkStatus > LinkStatus_UNUSABLE_LIBAV57) {
+            sLinkStatus = LinkStatus_UNUSABLE_LIBAV57;
+            sLinkStatusLibraryName = lib;
+          }
+          break;
+        case FFmpegLibWrapper::LinkResult::BlockedOldLibAVVersion:
+          if (sLinkStatus > LinkStatus_OBSOLETE_LIBAV) {
+            sLinkStatus = LinkStatus_OBSOLETE_LIBAV;
+            sLinkStatusLibraryName = lib;
+          }
+          break;
+        case FFmpegLibWrapper::LinkResult::UnknownFutureLibAVVersion:
+        case FFmpegLibWrapper::LinkResult::MissingLibAVFunction:
+          if (sLinkStatus > LinkStatus_INVALID_LIBAV_CANDIDATE) {
+            sLinkStatus = LinkStatus_INVALID_LIBAV_CANDIDATE;
+            sLinkStatusLibraryName = lib;
+          }
+          break;
+        case FFmpegLibWrapper::LinkResult::UnknownFutureFFMpegVersion:
+        case FFmpegLibWrapper::LinkResult::MissingFFMpegFunction:
+          if (sLinkStatus > LinkStatus_INVALID_FFMPEG_CANDIDATE) {
+            sLinkStatus = LinkStatus_INVALID_FFMPEG_CANDIDATE;
+            sLinkStatusLibraryName = lib;
+          }
+          break;
+        case FFmpegLibWrapper::LinkResult::UnknownOlderFFMpegVersion:
+          if (sLinkStatus > LinkStatus_OBSOLETE_FFMPEG) {
+            sLinkStatus = LinkStatus_OBSOLETE_FFMPEG;
+            sLinkStatusLibraryName = lib;
+          }
+          break;
+      }
+    }
+  }
+
+  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");
+
+  return false;
+}
+
+/* static */
+already_AddRefed<PlatformDecoderModule> FFmpegRuntimeLinker::Create() {
+  if (!Init()) {
+    return nullptr;
+  }
+  RefPtr<PlatformDecoderModule> module;
+  switch (sLibAV.mVersion) {
+    case 53:
+      module = FFmpegDecoderModule<53>::Create(&sLibAV);
+      break;
+    case 54:
+      module = FFmpegDecoderModule<54>::Create(&sLibAV);
+      break;
+    case 55:
+    case 56:
+      module = FFmpegDecoderModule<55>::Create(&sLibAV);
+      break;
+    case 57:
+      module = FFmpegDecoderModule<57>::Create(&sLibAV);
+      break;
+    case 58:
+      module = FFmpegDecoderModule<58>::Create(&sLibAV);
+      break;
+    case 59:
+      module = FFmpegDecoderModule<59>::Create(&sLibAV);
+      break;
+    case 60:
+      module = FFmpegDecoderModule<60>::Create(&sLibAV);
+      break;
+    default:
+      module = nullptr;
+  }
+  return module.forget();
+}
+
+/* static */ const char* FFmpegRuntimeLinker::LinkStatusString() {
+  switch (sLinkStatus) {
+    case LinkStatus_INIT:
+      return "Libavcodec not initialized yet";
+    case LinkStatus_SUCCEEDED:
+      return "Libavcodec linking succeeded";
+    case LinkStatus_INVALID_FFMPEG_CANDIDATE:
+      return "Invalid FFMpeg libavcodec candidate";
+    case LinkStatus_UNUSABLE_LIBAV57:
+      return "Unusable LibAV's libavcodec 57";
+    case LinkStatus_INVALID_LIBAV_CANDIDATE:
+      return "Invalid LibAV libavcodec candidate";
+    case LinkStatus_OBSOLETE_FFMPEG:
+      return "Obsolete FFMpeg libavcodec candidate";
+    case LinkStatus_OBSOLETE_LIBAV:
+      return "Obsolete LibAV libavcodec candidate";
+    case LinkStatus_INVALID_CANDIDATE:
+      return "Invalid libavcodec candidate";
+    case LinkStatus_NOT_FOUND:
+      return "Libavcodec not found";
+  }
+  MOZ_ASSERT_UNREACHABLE("Unknown sLinkStatus value");
+  return "?";
+}
+
+}  // namespace mozilla