/*
 *  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.
 */

#include "api/video/encoded_frame.h"

#include <cstddef>
#include <cstdint>
#include <optional>

#include "absl/types/variant.h"
#include "api/units/timestamp.h"
#include "api/video/video_codec_type.h"
#include "modules/rtp_rtcp/source/rtp_video_header.h"
#include "modules/video_coding/codecs/interface/common_constants.h"
#include "modules/video_coding/codecs/vp8/include/vp8_globals.h"
#include "modules/video_coding/codecs/vp9/include/vp9_globals.h"

namespace webrtc {

std::optional<Timestamp> EncodedFrame::ReceivedTimestamp() const {
  return ReceivedTime() >= 0
             ? std::make_optional(Timestamp::Millis(ReceivedTime()))
             : std::nullopt;
}

std::optional<Timestamp> EncodedFrame::RenderTimestamp() const {
  return RenderTimeMs() >= 0
             ? std::make_optional(Timestamp::Millis(RenderTimeMs()))
             : std::nullopt;
}

bool EncodedFrame::delayed_by_retransmission() const {
  return false;
}

void EncodedFrame::CopyCodecSpecific(const RTPVideoHeader* header) {
  if (header) {
    switch (header->codec) {
      case kVideoCodecVP8: {
        const auto& vp8_header =
            absl::get<RTPVideoHeaderVP8>(header->video_type_header);
        if (_codecSpecificInfo.codecType != kVideoCodecVP8) {
          // This is the first packet for this frame.
          _codecSpecificInfo.codecSpecific.VP8.temporalIdx = 0;
          _codecSpecificInfo.codecSpecific.VP8.layerSync = false;
          _codecSpecificInfo.codecSpecific.VP8.keyIdx = -1;
          _codecSpecificInfo.codecType = kVideoCodecVP8;
        }
        _codecSpecificInfo.codecSpecific.VP8.nonReference =
            vp8_header.nonReference;
        if (vp8_header.temporalIdx != kNoTemporalIdx) {
          _codecSpecificInfo.codecSpecific.VP8.temporalIdx =
              vp8_header.temporalIdx;
          _codecSpecificInfo.codecSpecific.VP8.layerSync = vp8_header.layerSync;
        }
        if (vp8_header.keyIdx != kNoKeyIdx) {
          _codecSpecificInfo.codecSpecific.VP8.keyIdx = vp8_header.keyIdx;
        }
        break;
      }
      case kVideoCodecVP9: {
        const auto& vp9_header =
            absl::get<RTPVideoHeaderVP9>(header->video_type_header);
        if (_codecSpecificInfo.codecType != kVideoCodecVP9) {
          // This is the first packet for this frame.
          _codecSpecificInfo.codecSpecific.VP9.temporal_idx = 0;
          _codecSpecificInfo.codecSpecific.VP9.gof_idx = 0;
          _codecSpecificInfo.codecSpecific.VP9.inter_layer_predicted = false;
          _codecSpecificInfo.codecType = kVideoCodecVP9;
        }
        _codecSpecificInfo.codecSpecific.VP9.inter_pic_predicted =
            vp9_header.inter_pic_predicted;
        _codecSpecificInfo.codecSpecific.VP9.flexible_mode =
            vp9_header.flexible_mode;
        _codecSpecificInfo.codecSpecific.VP9.num_ref_pics =
            vp9_header.num_ref_pics;
        for (uint8_t r = 0; r < vp9_header.num_ref_pics; ++r) {
          _codecSpecificInfo.codecSpecific.VP9.p_diff[r] =
              vp9_header.pid_diff[r];
        }
        _codecSpecificInfo.codecSpecific.VP9.ss_data_available =
            vp9_header.ss_data_available;
        if (vp9_header.temporal_idx != kNoTemporalIdx) {
          _codecSpecificInfo.codecSpecific.VP9.temporal_idx =
              vp9_header.temporal_idx;
          _codecSpecificInfo.codecSpecific.VP9.temporal_up_switch =
              vp9_header.temporal_up_switch;
        }
        if (vp9_header.spatial_idx != kNoSpatialIdx) {
          _codecSpecificInfo.codecSpecific.VP9.inter_layer_predicted =
              vp9_header.inter_layer_predicted;
          SetSpatialIndex(vp9_header.spatial_idx);
        }
        if (vp9_header.gof_idx != kNoGofIdx) {
          _codecSpecificInfo.codecSpecific.VP9.gof_idx = vp9_header.gof_idx;
        }
        if (vp9_header.ss_data_available) {
          _codecSpecificInfo.codecSpecific.VP9.num_spatial_layers =
              vp9_header.num_spatial_layers;
          _codecSpecificInfo.codecSpecific.VP9
              .spatial_layer_resolution_present =
              vp9_header.spatial_layer_resolution_present;
          if (vp9_header.spatial_layer_resolution_present) {
            for (size_t i = 0; i < vp9_header.num_spatial_layers; ++i) {
              _codecSpecificInfo.codecSpecific.VP9.width[i] =
                  vp9_header.width[i];
              _codecSpecificInfo.codecSpecific.VP9.height[i] =
                  vp9_header.height[i];
            }
          }
          _codecSpecificInfo.codecSpecific.VP9.gof.CopyGofInfoVP9(
              vp9_header.gof);
        }
        break;
      }
      case kVideoCodecH264: {
        _codecSpecificInfo.codecType = kVideoCodecH264;
        break;
      }
      case kVideoCodecAV1: {
        _codecSpecificInfo.codecType = kVideoCodecAV1;
        break;
      }
      default: {
        _codecSpecificInfo.codecType = kVideoCodecGeneric;
        break;
      }
    }
  }
}

}  // namespace webrtc