/*
 * libmedia mp4 dfla box parser
 *
 * 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 { Atom, IsobmffContext } from '../type'
import { logger } from '@libmedia/common'
import { type IOReader } from '@libmedia/common/io'
import { mapSafeUint8Array } from '@libmedia/cheap'
import { flac } from '@libmedia/avutil/internal'
import { avFree, avMalloc, AVCodecID, AVPacketSideDataType, type AVStream } from '@libmedia/avutil'

export default async function read(ioReader: IOReader, stream: AVStream, atom: Atom, isobmffContext: IsobmffContext) {

  const now = ioReader.getPos()

  stream.codecpar.codecId = AVCodecID.AV_CODEC_ID_FLAC

  // FlacSpecificBox version
  await ioReader.skip(1)
  // flag
  await ioReader.skip(3)

  const tmp = await ioReader.readUint8()
  const last = tmp & 0x80
  const type = tmp & 0x7f
  const size = await ioReader.readUint24()

  if (type === flac.FlacMetadataType.FLAC_METADATA_TYPE_STREAMINFO && size === 34) {
    const data: pointer<uint8> = avMalloc(size)
    const extradata = await ioReader.readBuffer(size, mapSafeUint8Array(data, size))

    if (isobmffContext.foundMoov) {
      stream.sideData[AVPacketSideDataType.AV_PKT_DATA_NEW_EXTRADATA] = extradata.slice()
      avFree(data)
    }
    else {
      if (stream.codecpar.extradata) {
        avFree(stream.codecpar.extradata)
      }
      stream.codecpar.extradata = data
      stream.codecpar.extradataSize = size
      flac.parseAVCodecParameters(stream, extradata)
    }
  }
  else {
    logger.error('streaminfo must be first FLACMetadataBlock')
  }

  if (!last) {
    logger.warn('non streaminfo FLACMetadataBlock(s) ignored')
  }

  const remainingLength = atom.size - Number(ioReader.getPos() - now)
  if (remainingLength > 0) {
    await ioReader.skip(remainingLength)
  }
  else if (remainingLength < 0) {
    logger.error(`read vpcc error, size: ${atom.size}, read: ${atom.size - remainingLength}`)
  }
}