/* -*- 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[] = {

#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

};

/* static */ bool

FFmpegRuntimeLinker::Init()

{

  if (sLinkStatus != LinkStatus_INIT) {

    return sLinkStatus == LinkStatus_SUCCEEDED;

  }

  // 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::CreateDecoderModule()

{

  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;

    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