/*
 * libmedia mp4 dops box write
 *
 * 版权所有 (C) 2024 赵高兴
 * Copyright (C) 2024 Gaoxing Zhao
 *
 * 此文件是 libmedia 的一部分
 * This file is part of libmedia.
 * 
 * libmedia 是自由软件；您可以根据 GNU Lesser General Public License（GNU LGPL）3.1
 * 或任何其更新的版本条款重新分发或修改它
 * libmedia is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.1 of the License, or (at your option) any later version.
 * 
 * libmedia 希望能够为您提供帮助，但不提供任何明示或暗示的担保，包括但不限于适销性或特定用途的保证
 * 您应自行承担使用 libmedia 的风险，并且需要遵守 GNU Lesser General Public License 中的条款和条件。
 * libmedia is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 */

import type { IsobmffContext } from '../type'
import { BoxType } from '../boxType'
import { type IOWriterSync, BufferReader } from '@libmedia/common/io'
import { mapUint8Array } from '@libmedia/cheap'
import { AVPacketSideDataType, type AVStream } from '@libmedia/avutil'

export default function write(ioWriter: IOWriterSync, stream: AVStream, isobmffContext: IsobmffContext) {

  let extradata: Uint8Array

  if (isobmffContext.fragment) {
    if (stream.sideData[AVPacketSideDataType.AV_PKT_DATA_NEW_EXTRADATA]) {
      extradata = stream.sideData[AVPacketSideDataType.AV_PKT_DATA_NEW_EXTRADATA]
      delete stream.sideData[AVPacketSideDataType.AV_PKT_DATA_NEW_EXTRADATA]
    }
    else {
      if (stream.codecpar.extradata) {
        extradata = mapUint8Array(stream.codecpar.extradata, reinterpret_cast<size>(stream.codecpar.extradataSize))
      }
    }
  }
  else {
    if (stream.codecpar.extradata) {
      extradata = mapUint8Array(stream.codecpar.extradata, reinterpret_cast<size>(stream.codecpar.extradataSize))
    }
  }

  if (!extradata || extradata.length < 19) {
    ioWriter.writeUint32(19)
    ioWriter.writeString(BoxType.DOPS)
    ioWriter.writeUint8(0)
    ioWriter.writeUint8(stream.codecpar.chLayout.nbChannels)
    ioWriter.writeUint16(stream.codecpar.initialPadding)
    ioWriter.writeUint32(stream.codecpar.sampleRate)
    ioWriter.writeUint16(0)
    ioWriter.writeUint8(0)
  }
  else {
    const reader = new BufferReader(extradata, false)
    // size
    ioWriter.writeUint32(extradata.length)
    // tag
    ioWriter.writeString(BoxType.DOPS)
    // Version
    ioWriter.writeUint8(0)

    reader.seek(9)
    ioWriter.writeUint8(reader.readUint8())
    ioWriter.writeUint16(reader.readUint16())
    ioWriter.writeUint32(reader.readUint32())
    ioWriter.writeUint16(reader.readUint16())
    ioWriter.writeBuffer(extradata.subarray(18))
  }
}