/*
 *  Copyright (c) 2018 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 MODULES_RTP_RTCP_SOURCE_RTP_VIDEO_HEADER_H_
#define MODULES_RTP_RTCP_SOURCE_RTP_VIDEO_HEADER_H_

#include <bitset>
#include <cstdint>

#include "absl/container/inlined_vector.h"
#include "absl/types/optional.h"
#include "absl/types/variant.h"
#include "api/rtp_headers.h"
#include "api/transport/rtp/dependency_descriptor.h"
#include "api/video/color_space.h"
#include "api/video/video_codec_type.h"
#include "api/video/video_content_type.h"
#include "api/video/video_frame_metadata.h"
#include "api/video/video_frame_type.h"
#include "api/video/video_rotation.h"
#include "api/video/video_timing.h"
#include "modules/video_coding/codecs/h264/include/h264_globals.h"
#include "modules/video_coding/codecs/vp8/include/vp8_globals.h"
#include "modules/video_coding/codecs/vp9/include/vp9_globals.h"

namespace webrtc {
// Details passed in the rtp payload for legacy generic rtp packetizer.
// TODO(bugs.webrtc.org/9772): Deprecate in favor of passing generic video
// details in an rtp header extension.
struct RTPVideoHeaderLegacyGeneric {
  uint16_t picture_id;
};

using RTPVideoTypeHeader = absl::variant<absl::monostate,
                                         RTPVideoHeaderVP8,
                                         RTPVideoHeaderVP9,
                                         RTPVideoHeaderH264,
                                         RTPVideoHeaderLegacyGeneric>;

struct RTPVideoHeader {
  struct GenericDescriptorInfo {
    GenericDescriptorInfo();
    GenericDescriptorInfo(const GenericDescriptorInfo& other);
    ~GenericDescriptorInfo();

    int64_t frame_id = 0;
    int spatial_index = 0;
    int temporal_index = 0;
    absl::InlinedVector<DecodeTargetIndication, 10> decode_target_indications;
    absl::InlinedVector<int64_t, 5> dependencies;
    absl::InlinedVector<int, 4> chain_diffs;
    std::bitset<32> active_decode_targets = ~uint32_t{0};
  };

  static RTPVideoHeader FromMetadata(const VideoFrameMetadata& metadata);

  RTPVideoHeader();
  RTPVideoHeader(const RTPVideoHeader& other);

  ~RTPVideoHeader();

  // The subset of RTPVideoHeader that is exposed in the Insertable Streams API.
  VideoFrameMetadata GetAsMetadata() const;
  void SetFromMetadata(const VideoFrameMetadata& metadata);

  absl::optional<GenericDescriptorInfo> generic;

  VideoFrameType frame_type = VideoFrameType::kEmptyFrame;
  uint16_t width = 0;
  uint16_t height = 0;
  VideoRotation rotation = VideoRotation::kVideoRotation_0;
  VideoContentType content_type = VideoContentType::UNSPECIFIED;
  bool is_first_packet_in_frame = false;
  bool is_last_packet_in_frame = false;
  bool is_last_frame_in_picture = true;
  uint8_t simulcastIdx = 0;
  VideoCodecType codec = VideoCodecType::kVideoCodecGeneric;

  absl::optional<VideoPlayoutDelay> playout_delay;
  VideoSendTiming video_timing;
  absl::optional<ColorSpace> color_space;
  // This field is meant for media quality testing purpose only. When enabled it
  // carries the webrtc::VideoFrame id field from the sender to the receiver.
  absl::optional<uint16_t> video_frame_tracking_id;
  RTPVideoTypeHeader video_type_header;

  // When provided, is sent as is as an RTP header extension according to
  // http://www.webrtc.org/experiments/rtp-hdrext/abs-capture-time.
  // Otherwise, it is derived from other relevant information.
  absl::optional<AbsoluteCaptureTime> absolute_capture_time;
};

}  // namespace webrtc

#endif  // MODULES_RTP_RTCP_SOURCE_RTP_VIDEO_HEADER_H_