/*
 * Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
 *
 * This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
 *
 * Use of this source code is governed by MIT-like license that can be found in the
 * LICENSE file in the root of the source tree. All contributing project authors
 * may be found in the AUTHORS file in the root of the source tree.
 */

#include "H265Rtmp.h"
#include "Rtmp/utils.h"
#include "Common/config.h"
#ifdef ENABLE_MP4
#include "mpeg4-hevc.h"
#endif // ENABLE_MP4

using namespace std;
using namespace toolkit;

namespace mediakit {

void H265RtmpDecoder::inputRtmp(const RtmpPacket::Ptr &pkt) {
    if (_info.codec == CodecInvalid) {
        // 先判断是否为增强型rtmp
        parseVideoRtmpPacket((uint8_t *)pkt->data(), pkt->size(), &_info);
    }

    if (_info.is_enhanced) {
        // 增强型rtmp
        parseVideoRtmpPacket((uint8_t *)pkt->data(), pkt->size(), &_info);
        if (!_info.is_enhanced || _info.codec != CodecH265) {
            throw std::invalid_argument("Invalid enhanced-rtmp hevc packet!");
        }

        switch (_info.video.pkt_type) {
            case RtmpPacketType::PacketTypeSequenceStart: {
                getTrack()->setExtraData((uint8_t *)pkt->data() + RtmpPacketInfo::kEnhancedRtmpHeaderSize, pkt->size() - RtmpPacketInfo::kEnhancedRtmpHeaderSize);
                break;
            }

            case RtmpPacketType::PacketTypeCodedFramesX:
            case RtmpPacketType::PacketTypeCodedFrames: {
                auto data = (uint8_t *)pkt->data() + RtmpPacketInfo::kEnhancedRtmpHeaderSize;
                auto size = pkt->size() - RtmpPacketInfo::kEnhancedRtmpHeaderSize;
                auto pts = pkt->time_stamp;
                CHECK(size > 3);
                if (RtmpPacketType::PacketTypeCodedFrames == _info.video.pkt_type) {
                    // SI24 = [CompositionTime Offset]
                    int32_t cts = (((data[0] << 16) | (data[1] << 8) | (data[2])) + 0xff800000) ^ 0xff800000;
                    pts += cts;
                    data += 3;
                    size -= 3;
                }
                CHECK(size > 4);
                splitFrame(data, size, pkt->time_stamp, pts);
                break;
            }
            default: WarnL << "Unknown pkt_type: " << (int)_info.video.pkt_type; break;
        }
        return;
    }

    // 国内扩展(12) H265 rtmp
    if (pkt->isConfigFrame()) {
        CHECK(pkt->size() > 5);
        getTrack()->setExtraData((uint8_t *)pkt->data() + 5, pkt->size() - 5);
        return;
    }

    CHECK(pkt->size() > 9);
    uint8_t *cts_ptr = (uint8_t *)(pkt->buffer.data() + 2);
    int32_t cts = (((cts_ptr[0] << 16) | (cts_ptr[1] << 8) | (cts_ptr[2])) + 0xff800000) ^ 0xff800000;
    auto pts = pkt->time_stamp + cts;
    splitFrame((uint8_t *)pkt->data() + 5, pkt->size() - 5, pkt->time_stamp, pts);
}

void H265RtmpDecoder::splitFrame(const uint8_t *data, size_t size, uint32_t dts, uint32_t pts) {
    auto end = data + size;
    while (data + 4 < end) {
        uint32_t frame_len = load_be32(data);
        data += 4;
        if (data + frame_len > end) {
            break;
        }
        outputFrame((const char *)data, frame_len, dts, pts);
        data += frame_len;
    }
}

inline void H265RtmpDecoder::outputFrame(const char *data, size_t size, uint32_t dts, uint32_t pts) {
    auto frame = FrameImp::create<H265Frame>();
    frame->_prefix_size = 4;
    frame->_dts = dts;
    frame->_pts = pts;
    frame->_buffer.assign("\x00\x00\x00\x01", 4); // 添加265头
    frame->_buffer.append(data, size);
    RtmpCodec::inputFrame(frame);
}

////////////////////////////////////////////////////////////////////////

void H265RtmpEncoder::flush() {
    inputFrame(nullptr);
}

bool H265RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
    if (!_rtmp_packet) {
        _rtmp_packet = RtmpPacket::create();
        GET_CONFIG(bool, enhanced, Rtmp::kEnhanced);
        _rtmp_packet->buffer.resize((enhanced ? RtmpPacketInfo::kEnhancedRtmpHeaderSize : 2) + 3);
    }

    return _merger.inputFrame(frame, [this](uint64_t dts, uint64_t pts, const Buffer::Ptr &, bool have_key_frame) {
            GET_CONFIG(bool, enhanced, Rtmp::kEnhanced);
            if (enhanced) {
                auto header = (RtmpVideoHeaderEnhanced *)_rtmp_packet->data();
                header->enhanced = 1;
                header->pkt_type = (int)RtmpPacketType::PacketTypeCodedFrames;
                header->frame_type = have_key_frame ? (int)RtmpFrameType::key_frame : (int)RtmpFrameType::inter_frame;
                header->fourcc = htonl((uint32_t)RtmpVideoCodec::fourcc_hevc);
            } else {
                // flags
                _rtmp_packet->buffer[0] = (uint8_t)RtmpVideoCodec::h265 | ((uint8_t)(have_key_frame ? RtmpFrameType::key_frame : RtmpFrameType::inter_frame) << 4);
                _rtmp_packet->buffer[1] = (uint8_t)RtmpH264PacketType::h264_nalu;
            }

            int32_t cts = pts - dts;
            // cts
            set_be24(&_rtmp_packet->buffer[enhanced ? 5 : 2], cts);
            _rtmp_packet->time_stamp = dts;
            _rtmp_packet->body_size = _rtmp_packet->buffer.size();
            _rtmp_packet->chunk_id = CHUNK_VIDEO;
            _rtmp_packet->stream_index = STREAM_MEDIA;
            _rtmp_packet->type_id = MSG_VIDEO;
            // 输出rtmp packet
            RtmpCodec::inputRtmp(_rtmp_packet);
            _rtmp_packet = nullptr;
        }, &_rtmp_packet->buffer);
}

void H265RtmpEncoder::makeConfigPacket() {
    auto pkt = RtmpPacket::create();
    GET_CONFIG(bool, enhanced, Rtmp::kEnhanced);
    if (enhanced) {
        pkt->buffer.resize(RtmpPacketInfo::kEnhancedRtmpHeaderSize);
        auto header = (RtmpVideoHeaderEnhanced *)pkt->data();
        header->enhanced = 1;
        header->pkt_type = (int)RtmpPacketType::PacketTypeSequenceStart;
        header->frame_type = (int)RtmpFrameType::key_frame;
        header->fourcc = htonl((uint32_t)RtmpVideoCodec::fourcc_hevc);
    } else {
        auto flags = (uint8_t)RtmpVideoCodec::h265;
        flags |= ((uint8_t)RtmpFrameType::key_frame << 4);
        // header
        pkt->buffer.push_back(flags);
        pkt->buffer.push_back((uint8_t)RtmpH264PacketType::h264_config_header);
        // cts
        pkt->buffer.append("\x0\x0\x0", 3);
    }

    // HEVCDecoderConfigurationRecord
    auto extra_data = getTrack()->getExtraData();
    CHECK(extra_data);
    pkt->buffer.append(extra_data->data(), extra_data->size());
    pkt->body_size = pkt->buffer.size();
    pkt->chunk_id = CHUNK_VIDEO;
    pkt->stream_index = STREAM_MEDIA;
    pkt->time_stamp = 0;
    pkt->type_id = MSG_VIDEO;
    RtmpCodec::inputRtmp(pkt);
}

} // namespace mediakit