// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/gpu/gpu_video_encode_accelerator_factory.h"

#include "base/bind.h"
#include "base/memory/ptr_util.h"
#include "build/build_config.h"
#include "media/gpu/buildflags.h"
#include "media/gpu/gpu_video_accelerator_util.h"

#if BUILDFLAG(USE_V4L2_CODEC)
#include "media/gpu/v4l2/v4l2_video_encode_accelerator.h"
#endif
#if defined(OS_ANDROID)
#include "media/gpu/android/android_video_encode_accelerator.h"
#endif
#if defined(OS_MACOSX)
#include "media/gpu/mac/vt_video_encode_accelerator_mac.h"
#endif
#if defined(OS_WIN)
#include "base/feature_list.h"
#include "media/base/media_switches.h"
#include "media/gpu/windows/media_foundation_video_encode_accelerator_win.h"
#endif
#if BUILDFLAG(USE_VAAPI)
#include "media/gpu/vaapi/vaapi_video_encode_accelerator.h"
#endif

namespace media {

namespace {
#if BUILDFLAG(USE_V4L2_CODEC)
std::unique_ptr<VideoEncodeAccelerator> CreateV4L2VEA() {
  scoped_refptr<V4L2Device> device = V4L2Device::Create();
  if (!device)
    return nullptr;
  return base::WrapUnique<VideoEncodeAccelerator>(
      new V4L2VideoEncodeAccelerator(std::move(device)));
}
#endif

#if BUILDFLAG(USE_VAAPI)
std::unique_ptr<VideoEncodeAccelerator> CreateVaapiVEA() {
  return base::WrapUnique<VideoEncodeAccelerator>(
      new VaapiVideoEncodeAccelerator());
}
#endif

#if defined(OS_ANDROID)
std::unique_ptr<VideoEncodeAccelerator> CreateAndroidVEA() {
  return base::WrapUnique<VideoEncodeAccelerator>(
      new AndroidVideoEncodeAccelerator());
}
#endif

#if defined(OS_MACOSX)
std::unique_ptr<VideoEncodeAccelerator> CreateVTVEA() {
  return base::WrapUnique<VideoEncodeAccelerator>(
      new VTVideoEncodeAccelerator());
}
#endif

#if defined(OS_WIN)
// Creates a MediaFoundationVEA for Win 7 or later. If |compatible_with_win7| is
// true, VEA is limited to a subset of features that is compatible with Win 7.
std::unique_ptr<VideoEncodeAccelerator> CreateMediaFoundationVEA(
    bool compatible_with_win7) {
  return base::WrapUnique<VideoEncodeAccelerator>(
      new MediaFoundationVideoEncodeAccelerator(compatible_with_win7));
}
#endif

using VEAFactoryFunction =
    base::RepeatingCallback<std::unique_ptr<VideoEncodeAccelerator>()>;

std::vector<VEAFactoryFunction> GetVEAFactoryFunctions(
    const gpu::GpuPreferences& gpu_preferences) {
  // Array of VEAFactoryFunctions potentially usable on the current platform.
  // This list is ordered by priority, from most to least preferred, if
  // applicable. This list is composed once and then reused.
  static std::vector<VEAFactoryFunction> vea_factory_functions;
  if (gpu_preferences.disable_accelerated_video_encode)
    return vea_factory_functions;
  if (!vea_factory_functions.empty())
    return vea_factory_functions;

#if BUILDFLAG(USE_V4L2_CODEC)
  vea_factory_functions.push_back(base::BindRepeating(&CreateV4L2VEA));
#endif
#if BUILDFLAG(USE_VAAPI)
  vea_factory_functions.push_back(base::BindRepeating(&CreateVaapiVEA));
#endif
#if defined(OS_ANDROID)
  vea_factory_functions.push_back(base::BindRepeating(&CreateAndroidVEA));
#endif
#if defined(OS_MACOSX)
  vea_factory_functions.push_back(base::BindRepeating(&CreateVTVEA));
#endif
#if defined(OS_WIN)
  if (base::FeatureList::IsEnabled(kMediaFoundationH264Encoding)) {
    vea_factory_functions.push_back(base::BindRepeating(
        &CreateMediaFoundationVEA,
        gpu_preferences.enable_media_foundation_vea_on_windows7));
  }
#endif
  return vea_factory_functions;
}

}  // anonymous namespace

// static
MEDIA_GPU_EXPORT std::unique_ptr<VideoEncodeAccelerator>
GpuVideoEncodeAcceleratorFactory::CreateVEA(
    const VideoEncodeAccelerator::Config& config,
    VideoEncodeAccelerator::Client* client,
    const gpu::GpuPreferences& gpu_preferences) {
  for (const auto& create_vea : GetVEAFactoryFunctions(gpu_preferences)) {
    auto vea = create_vea.Run();
    if (!vea)
      continue;
    if (!vea->Initialize(config, client)) {
      DLOG(ERROR) << "VEA initialize failed (" << config.AsHumanReadableString()
                  << ")";
      continue;
    }
    return vea;
  }
  return nullptr;
}

// static
MEDIA_GPU_EXPORT VideoEncodeAccelerator::SupportedProfiles
GpuVideoEncodeAcceleratorFactory::GetSupportedProfiles(
    const gpu::GpuPreferences& gpu_preferences) {
  VideoEncodeAccelerator::SupportedProfiles profiles;
  for (const auto& create_vea : GetVEAFactoryFunctions(gpu_preferences)) {
    auto vea = std::move(create_vea).Run();
    if (!vea)
      continue;
    GpuVideoAcceleratorUtil::InsertUniqueEncodeProfiles(
        vea->GetSupportedProfiles(), &profiles);
  }
  return profiles;
}

}  // namespace media