/*
 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MEDIA_ENGINE_WEBRTC_MEDIA_ENGINE_H_
#define MEDIA_ENGINE_WEBRTC_MEDIA_ENGINE_H_

#include <memory>
#include <string>
#include <vector>

#include "api/task_queue/task_queue_factory.h"
#include "call/call.h"
#include "media/base/media_engine.h"
#include "modules/audio_device/include/audio_device.h"

namespace webrtc {
class AudioDecoderFactory;
class AudioMixer;
class AudioProcessing;
class VideoDecoderFactory;
class VideoEncoderFactory;
class VideoBitrateAllocatorFactory;
}  // namespace webrtc

namespace cricket {

struct MediaEngineDependencies {
  MediaEngineDependencies() = default;
  MediaEngineDependencies(const MediaEngineDependencies&) = delete;
  MediaEngineDependencies(MediaEngineDependencies&&) = default;
  MediaEngineDependencies& operator=(const MediaEngineDependencies&) = delete;
  MediaEngineDependencies& operator=(MediaEngineDependencies&&) = default;
  ~MediaEngineDependencies() = default;

  webrtc::TaskQueueFactory* task_queue_factory = nullptr;
  rtc::scoped_refptr<webrtc::AudioDeviceModule> adm;
  rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory;
  rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory;
  rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer;
  rtc::scoped_refptr<webrtc::AudioProcessing> audio_processing;

  std::unique_ptr<webrtc::VideoEncoderFactory> video_encoder_factory;
  std::unique_ptr<webrtc::VideoDecoderFactory> video_decoder_factory;
  std::unique_ptr<webrtc::VideoBitrateAllocatorFactory>
      video_bitrate_allocator_factory;
};

std::unique_ptr<MediaEngineInterface> CreateMediaEngine(
    MediaEngineDependencies dependencies);

class WebRtcMediaEngineFactory {
 public:
  // These Create methods may be called on any thread, though the engine is
  // only expected to be used on one thread, internally called the "worker
  // thread". This is the thread Init must be called on.

  // Create a MediaEngineInterface with optional video codec factories. These
  // video factories represents all video codecs, i.e. no extra internal video
  // codecs will be added.
  static std::unique_ptr<MediaEngineInterface> Create(
      rtc::scoped_refptr<webrtc::AudioDeviceModule> adm,
      rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory,
      rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory,
      std::unique_ptr<webrtc::VideoEncoderFactory> video_encoder_factory,
      std::unique_ptr<webrtc::VideoDecoderFactory> video_decoder_factory,
      rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer,
      rtc::scoped_refptr<webrtc::AudioProcessing> audio_processing);

  static std::unique_ptr<MediaEngineInterface> Create(
      rtc::scoped_refptr<webrtc::AudioDeviceModule> adm,
      rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory,
      rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory,
      std::unique_ptr<webrtc::VideoEncoderFactory> video_encoder_factory,
      std::unique_ptr<webrtc::VideoDecoderFactory> video_decoder_factory,
      std::unique_ptr<webrtc::VideoBitrateAllocatorFactory>
          video_bitrate_allocator_factory,
      rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer,
      rtc::scoped_refptr<webrtc::AudioProcessing> audio_processing);
};

// Verify that extension IDs are within 1-byte extension range and are not
// overlapping.
bool ValidateRtpExtensions(const std::vector<webrtc::RtpExtension>& extensions);

// Discard any extensions not validated by the 'supported' predicate. Duplicate
// extensions are removed if 'filter_redundant_extensions' is set, and also any
// mutually exclusive extensions (see implementation for details) are removed.
std::vector<webrtc::RtpExtension> FilterRtpExtensions(
    const std::vector<webrtc::RtpExtension>& extensions,
    bool (*supported)(const std::string&),
    bool filter_redundant_extensions);

webrtc::BitrateConstraints GetBitrateConfigForCodec(const Codec& codec);

}  // namespace cricket

#endif  // MEDIA_ENGINE_WEBRTC_MEDIA_ENGINE_H_