/* -*- 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 "GMPDecoderModule.h"
#include "GMPAudioDecoder.h"
#include "GMPVideoDecoder.h"
#include "MediaDataDecoderProxy.h"
#include "mozIGeckoMediaPluginService.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticMutex.h"
#include "gmp-audio-decode.h"
#include "gmp-video-decode.h"
#ifdef XP_WIN
#include "WMFDecoderModule.h"
#endif

namespace mozilla {

GMPDecoderModule::GMPDecoderModule()
{
}

GMPDecoderModule::~GMPDecoderModule()
{
}

static already_AddRefed<MediaDataDecoderProxy>
CreateDecoderWrapper(MediaDataDecoderCallback* aCallback)
{
  nsCOMPtr<mozIGeckoMediaPluginService> gmpService = do_GetService("@mozilla.org/gecko-media-plugin-service;1");
  if (!gmpService) {
    return nullptr;
  }

  nsCOMPtr<nsIThread> thread;
  nsresult rv = gmpService->GetThread(getter_AddRefs(thread));
  if (NS_FAILED(rv)) {
    return nullptr;
  }

  RefPtr<MediaDataDecoderProxy> decoder(new MediaDataDecoderProxy(thread, aCallback));
  return decoder.forget();
}

already_AddRefed<MediaDataDecoder>
GMPDecoderModule::CreateVideoDecoder(const VideoInfo& aConfig,
                                     layers::LayersBackend aLayersBackend,
                                     layers::ImageContainer* aImageContainer,
                                     FlushableTaskQueue* aVideoTaskQueue,
                                     MediaDataDecoderCallback* aCallback)
{
  if (!aConfig.mMimeType.EqualsLiteral("video/avc")) {
    return nullptr;
  }

  RefPtr<MediaDataDecoderProxy> wrapper = CreateDecoderWrapper(aCallback);
  wrapper->SetProxyTarget(new GMPVideoDecoder(aConfig,
                                              aLayersBackend,
                                              aImageContainer,
                                              aVideoTaskQueue,
                                              wrapper->Callback()));
  return wrapper.forget();
}

already_AddRefed<MediaDataDecoder>
GMPDecoderModule::CreateAudioDecoder(const AudioInfo& aConfig,
                                     FlushableTaskQueue* aAudioTaskQueue,
                                     MediaDataDecoderCallback* aCallback)
{
  if (!aConfig.mMimeType.EqualsLiteral("audio/mp4a-latm")) {
    return nullptr;
  }

  RefPtr<MediaDataDecoderProxy> wrapper = CreateDecoderWrapper(aCallback);
  wrapper->SetProxyTarget(new GMPAudioDecoder(aConfig,
                                              aAudioTaskQueue,
                                              wrapper->Callback()));
  return wrapper.forget();
}

PlatformDecoderModule::ConversionRequired
GMPDecoderModule::DecoderNeedsConversion(const TrackInfo& aConfig) const
{
  // GMPVideoCodecType::kGMPVideoCodecH264 specifies that encoded frames must be in AVCC format.
  if (aConfig.IsVideo()) {
    return kNeedAVCC;
  } else {
    return kNeedNone;
  }
}

static bool
HasGMPFor(const nsACString& aAPI,
          const nsACString& aCodec,
          const nsACString& aGMP)
{
  MOZ_ASSERT(NS_IsMainThread());
#ifdef XP_WIN
  // gmp-clearkey uses WMF for decoding, so if we're using clearkey we must
  // verify that WMF works before continuing.
  if (aGMP.EqualsLiteral("org.w3.clearkey")) {
    RefPtr<WMFDecoderModule> pdm(new WMFDecoderModule());
    if (aCodec.EqualsLiteral("aac") &&
        !pdm->SupportsMimeType(NS_LITERAL_CSTRING("audio/mp4a-latm"))) {
      return false;
    }
    if (aCodec.EqualsLiteral("h264") &&
        !pdm->SupportsMimeType(NS_LITERAL_CSTRING("video/avc"))) {
      return false;
    }
  }
#endif
  nsTArray<nsCString> tags;
  tags.AppendElement(aCodec);
  tags.AppendElement(aGMP);
  nsCOMPtr<mozIGeckoMediaPluginService> mps =
    do_GetService("@mozilla.org/gecko-media-plugin-service;1");
  if (NS_WARN_IF(!mps)) {
    return false;
  }
  bool hasPlugin = false;
  if (NS_FAILED(mps->HasPluginForAPI(aAPI, &tags, &hasPlugin))) {
    return false;
  }
  return hasPlugin;
}

StaticMutex sGMPCodecsMutex;

struct GMPCodecs {
  const char* mKeySystem;
  bool mHasAAC;
  bool mHasH264;
};

static GMPCodecs sGMPCodecs[] = {
  { "org.w3.clearkey", false, false },
  { "com.adobe.primetime", false, false },
};

void
GMPDecoderModule::UpdateUsableCodecs()
{
  MOZ_ASSERT(NS_IsMainThread());

  StaticMutexAutoLock lock(sGMPCodecsMutex);
  for (GMPCodecs& gmp : sGMPCodecs) {
    gmp.mHasAAC = HasGMPFor(NS_LITERAL_CSTRING(GMP_API_AUDIO_DECODER),
                            NS_LITERAL_CSTRING("aac"),
                            nsDependentCString(gmp.mKeySystem));
    gmp.mHasH264 = HasGMPFor(NS_LITERAL_CSTRING(GMP_API_VIDEO_DECODER),
                             NS_LITERAL_CSTRING("h264"),
                             nsDependentCString(gmp.mKeySystem));
  }
}

static uint32_t sPreferredAacGmp = 0;
static uint32_t sPreferredH264Gmp = 0;

/* static */
void
GMPDecoderModule::Init()
{
  MOZ_ASSERT(NS_IsMainThread());

  // GMPService::HasPluginForAPI is main thread only, so to implement
  // SupportsMimeType() we build a table of the codecs which each whitelisted
  // GMP has and update it when any GMPs are removed or added at runtime.
  UpdateUsableCodecs();

  Preferences::AddUintVarCache(&sPreferredAacGmp,
                               "media.gmp.decoder.aac", 0);
  Preferences::AddUintVarCache(&sPreferredH264Gmp,
                               "media.gmp.decoder.h264", 0);
}

/* static */
const Maybe<nsCString>
GMPDecoderModule::PreferredGMP(const nsACString& aMimeType)
{
  Maybe<nsCString> rv;
  if (aMimeType.EqualsLiteral("audio/mp4a-latm")) {
    switch (sPreferredAacGmp) {
      case 1: rv.emplace(NS_LITERAL_CSTRING("org.w3.clearkey")); break;
      case 2: rv.emplace(NS_LITERAL_CSTRING("com.adobe.primetime")); break;
      default: break;
    }
  }

  if (aMimeType.EqualsLiteral("video/avc") ||
      aMimeType.EqualsLiteral("video/mp4")) {
    switch (sPreferredH264Gmp) {
      case 1: rv.emplace(NS_LITERAL_CSTRING("org.w3.clearkey")); break;
      case 2: rv.emplace(NS_LITERAL_CSTRING("com.adobe.primetime")); break;
      default: break;
    }
  }

  return rv;
}

/* static */
bool
GMPDecoderModule::SupportsMimeType(const nsACString& aMimeType,
                                   const Maybe<nsCString>& aGMP)
{
  const bool isAAC = aMimeType.EqualsLiteral("audio/mp4a-latm");
  const bool isH264 = aMimeType.EqualsLiteral("video/avc") ||
                      aMimeType.EqualsLiteral("video/mp4");

  StaticMutexAutoLock lock(sGMPCodecsMutex);
  for (GMPCodecs& gmp : sGMPCodecs) {
    if (isAAC && gmp.mHasAAC &&
        (aGMP.isNothing() || aGMP.value().EqualsASCII(gmp.mKeySystem))) {
      return true;
    }
    if (isH264 && gmp.mHasH264 &&
        (aGMP.isNothing() || aGMP.value().EqualsASCII(gmp.mKeySystem))) {
      return true;
    }
  }

  return false;
}

bool
GMPDecoderModule::SupportsMimeType(const nsACString& aMimeType) const
{
  return SupportsMimeType(aMimeType, PreferredGMP(aMimeType));
}

} // namespace mozilla