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* Minified by jsDelivr using Terser v5.39.0.\n * Original file: /npm/mp4-remux@0.2.1/lib/mp4-remux.js\n *\n * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files\n */\n","import { Box } from \"./types\";\r\nimport * as Boxes from \".\";\r\n\r\nexport class Mp4Box {\r\n stream: Uint8Array = new Uint8Array();\r\n dv: DataView = new DataView(new Uint8Array().buffer);\r\n boxs: Box[] = [];\r\n boxPos = 0; // 记录元数据和盒子数据的偏差\r\n\r\n constructor(buf: Uint8Array) {\r\n this.stream = buf;\r\n this.dv = new DataView(buf.buffer);\r\n }\r\n\r\n set size(value: number) {\r\n this.writeUint(4, value);\r\n }\r\n get size() {\r\n return this.readUint(4);\r\n }\r\n get type() {\r\n return this.readString(4, 4);\r\n }\r\n\r\n /**\r\n * 获取当前 box 的 binary\r\n */\r\n get raw() {\r\n if (this.boxPos) {\r\n let size = this.boxPos;\r\n const bufs = this.boxs.map((item) => {\r\n const boxRaw = item.raw;\r\n size += boxRaw.length;\r\n return boxRaw;\r\n });\r\n this.size = size;\r\n const base = this.stream.slice(0, this.boxPos);\r\n\r\n // 将 Uint8Array[] 合并成一个\r\n const nbuf = new Uint8Array(size);\r\n let pos = 0;\r\n for (const item of [base, ...bufs]) {\r\n nbuf.set(item, pos);\r\n pos += item.length;\r\n }\r\n return nbuf;\r\n }\r\n\r\n return this.stream;\r\n }\r\n writeUint(size: 1 | 2 | 4, val: number, pos = 0) {\r\n const view = this.dv;\r\n switch (size) {\r\n case 1:\r\n view.setUint8(pos, val);\r\n break;\r\n case 2:\r\n view.setUint16(pos, val);\r\n break;\r\n case 4:\r\n view.setUint32(pos, val);\r\n break;\r\n }\r\n }\r\n writeInt(size: 1 | 2 | 4, val: number, pos = 0) {\r\n const view = this.dv;\r\n switch (size) {\r\n case 1:\r\n view.setInt8(pos, val);\r\n break;\r\n case 2:\r\n view.setInt16(pos, val);\r\n break;\r\n case 4:\r\n view.setInt32(pos, val);\r\n break;\r\n }\r\n }\r\n\r\n readInt(size: 1 | 2 | 4 = 4, pos = 0) {\r\n const view = this.dv;\r\n switch (size) {\r\n case 1:\r\n return view.getInt8(pos);\r\n case 2:\r\n return view.getInt16(pos);\r\n case 4:\r\n return view.getInt32(pos);\r\n }\r\n }\r\n\r\n // use dataView to Get Unsigned Int\r\n readUint(size: 1 | 2 | 4, pos = 0) {\r\n const view = this.dv;\r\n switch (size) {\r\n case 1:\r\n return view.getUint8(pos);\r\n case 2:\r\n return view.getUint16(pos);\r\n case 4:\r\n return view.getUint32(pos);\r\n }\r\n }\r\n /**\r\n * Read string by char code from Uint8Array\r\n * @param size\r\n */\r\n readString(size: 4, pos = 0) {\r\n let s = \"\";\r\n for (let i = 0; i < size; i++) {\r\n s += String.fromCharCode(this.readUint(1, pos + i));\r\n }\r\n return s;\r\n }\r\n\r\n parse(boxPos: number) {\r\n this.boxPos = boxPos;\r\n let pos = boxPos;\r\n while (pos <= this.stream.length - 8) {\r\n const size = this.readUint(4, pos);\r\n const type = this.readString(4, 4 + pos);\r\n if (size <= this.stream.length) {\r\n const tBuf = this.stream.slice(pos, pos + size);\r\n\r\n const BoxClass = Boxes[type as keyof typeof Boxes] || Boxes.free;\r\n this.boxs.push(new BoxClass(tBuf));\r\n }\r\n pos += size;\r\n }\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class trex extends Mp4Box {\r\n\r\n get version() {\r\n return this.readUint(1, 8);\r\n }\r\n get track_id():number{\r\n return this.readUint(4,12);\r\n }\r\n set track_id(value){\r\n this.writeUint(4,value,12);\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class trun extends Mp4Box {\r\n get sample_count() {\r\n return this.readUint(4, 12);\r\n }\r\n get data_offset() {\r\n return this.readInt(4, 16);\r\n }\r\n set data_offset(val) {\r\n this.writeInt(4, val, 16);\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class tfdt extends Mp4Box {}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class tfhd extends Mp4Box {\r\n get version() {\r\n return this.readUint(1, 8);\r\n }\r\n get track_id():number{\r\n return this.readUint(4,12);\r\n }\r\n set track_id(value){\r\n this.writeUint(4,value,12);\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\nimport { trun, tfhd } from \".\";\r\n\r\nexport class traf extends Mp4Box {\r\n constructor(buf: Uint8Array) {\r\n super(buf);\r\n this.parse(8);\r\n }\r\n get tfhd() {\r\n return this.boxs.find((box) => box instanceof tfhd) as tfhd;\r\n }\r\n get trun() {\r\n return this.boxs.find((box) => box instanceof trun) as trun;\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class mfhd extends Mp4Box {\r\n get sequence_number() {\r\n return this.readUint(4, 12);\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class udta extends Mp4Box {}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class mdia extends Mp4Box {}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class ftyp extends Mp4Box {}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class free extends Mp4Box {}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\nimport { mvhd, mvex, trak } from \".\";\r\n\r\nexport class moov extends Mp4Box {\r\n constructor(buf: Uint8Array) {\r\n super(buf);\r\n this.parse(8);\r\n }\r\n\r\n get mvhd() {\r\n return this.boxs.find((box) => box instanceof mvhd) as mvhd;\r\n }\r\n get mvex(){\r\n return this.boxs.find((box) => box instanceof mvex) as mvex;\r\n }\r\n get trak(){\r\n return this.boxs.find((box) => box instanceof trak) as trak;\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\nimport { mfhd, traf } from \"./\";\r\n\r\nexport class moof extends Mp4Box {\r\n constructor(buf: Uint8Array) {\r\n super(buf);\r\n this.parse(8);\r\n }\r\n get mfhd(){\r\n return this.boxs.find((box) => box instanceof mfhd) as mfhd\r\n }\r\n get traf(){\r\n return this.boxs.find((box) => box instanceof traf) as traf\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class sidx extends Mp4Box {\r\n get version() {\r\n return this.readUint(1, 8);\r\n }\r\n get reference_ID() {\r\n return this.readUint(4, 12);\r\n }\r\n get timescale() {\r\n return this.readUint(4, 16);\r\n }\r\n get reserved() {\r\n let offset = 8 + 20;\r\n if (this.version !== 0) {\r\n offset = 16 + 20;\r\n }\r\n return this.readUint(2, offset);\r\n }\r\n get reference_count() {\r\n let offset = 8 + 20;\r\n if (this.version !== 0) {\r\n offset = 16 + 20;\r\n }\r\n offset += 2;\r\n return this.readUint(2, offset);\r\n }\r\n get refList() {\r\n let offset = 8 + 24;\r\n if (this.version !== 0) {\r\n offset = 16 + 24;\r\n }\r\n const refrenceCount = this.reference_count;\r\n const resList = [];\r\n for (let i = 0; i < refrenceCount; i++) {\r\n const pos = offset + i * 12; // Position\r\n let tmp_32 = this.readUint(4, pos);\r\n const reference_type = (tmp_32 >> 31) & 0x1;\r\n const referenced_size = tmp_32 & 0x7fffffff;\r\n const subsegment_duration = this.readUint(4, pos + 4);\r\n tmp_32 = this.readUint(4, pos + 8);\r\n const starts_with_SAP = (tmp_32 >> 31) & 0x1;\r\n const SAP_type = (tmp_32 >> 28) & 0x7;\r\n const SAP_delta_time = tmp_32 & 0xfffffff;\r\n resList.push({\r\n reference_type,\r\n referenced_size,\r\n subsegment_duration,\r\n starts_with_SAP,\r\n SAP_type,\r\n SAP_delta_time,\r\n });\r\n }\r\n return resList;\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class mdat extends Mp4Box {\r\n push(value: Uint8Array) {\r\n // 向 stream 追加数据\r\n\r\n const newBuf = new Uint8Array(this.stream.length + value.length);\r\n newBuf.set(this.stream);\r\n newBuf.set(value, this.stream.length);\r\n this.stream = newBuf;\r\n this.dv = new DataView(this.stream.buffer);\r\n this.size = newBuf.length;\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class mvhd extends Mp4Box {\r\n\r\n get version() {\r\n return this.readUint(1, 8);\r\n }\r\n\r\n get next_track_ID(){\r\n if(this.version === 0){\r\n return this.readUint(4,104);\r\n }else{\r\n return this.readUint(4,116);\r\n }\r\n }\r\n set next_track_ID(value){\r\n if(this.version === 0){\r\n this.writeUint(4,value,104);\r\n }else{\r\n this.writeUint(4,value,116);\r\n }\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\nimport { trex } from \"./\";\r\n\r\nexport class mvex extends Mp4Box {\r\n constructor(buf: Uint8Array) {\r\n super(buf);\r\n this.parse(8);\r\n\r\n\r\n }\r\n get trex(){\r\n return this.boxs.find((box) => box instanceof trex) as trex;\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class tkhd extends Mp4Box {\r\n get version() {\r\n return this.readUint(1, 8);\r\n }\r\n\r\n get track_id():number{\r\n if(this.version === 1){\r\n return this.readUint(4, 28);\r\n }else{\r\n return this.readUint(4,20);\r\n }\r\n }\r\n set track_id(value){\r\n if(this.version === 1){\r\n this.writeUint(4,value,28);\r\n }else{\r\n this.writeUint(4,value,20);\r\n }\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\nimport { tkhd } from \"./tkhd\";\r\n\r\nexport class trak extends Mp4Box {\r\n constructor(buf: Uint8Array) {\r\n super(buf);\r\n this.parse(8);\r\n }\r\n get tkhd(): tkhd {\r\n return this.boxs.find((box) => box instanceof tkhd) as tkhd;\r\n }\r\n}\r\n","import { Mp4Box } from \"./Mp4Box.class\";\r\n\r\nexport class edts extends Mp4Box {}\r\n","import * as Boxes from \"./boxes.class\";\r\nimport { Box } from \"./boxes.class/types\";\r\n\r\nexport class Mp4Stream {\r\n stream: Uint8Array = new Uint8Array();\r\n dv: DataView = new DataView(new Uint8Array().buffer);\r\n boxs: Box[] = [];\r\n isEnd = false;\r\n\r\n get sidx() {\r\n return this.boxs.find((box) => box instanceof Boxes.sidx) as Boxes.sidx;\r\n }\r\n get moov() {\r\n return this.boxs.find((box) => box instanceof Boxes.moov) as Boxes.moov;\r\n }\r\n\r\n push(value: Uint8Array) {\r\n const newBuf = new Uint8Array(this.stream.length + value.length);\r\n newBuf.set(this.stream);\r\n newBuf.set(value, this.stream.length);\r\n this.stream = newBuf;\r\n this.dv = new DataView(this.stream.buffer);\r\n }\r\n\r\n /**\r\n * 将stream 截断，把pos前的数据返回，然后更新dataView\r\n * @param pos\r\n */\r\n slice(pos: number) {\r\n const sliceBuf = this.stream.slice(0, pos);\r\n const newBuf = new Uint8Array(this.stream.length - pos);\r\n newBuf.set(this.stream.slice(pos));\r\n this.stream = newBuf;\r\n this.dv = new DataView(this.stream.buffer);\r\n return sliceBuf;\r\n }\r\n // use dataView to Get Unsigned Int\r\n readUint(size: 1 | 2 | 4, pos = 0) {\r\n const view = this.dv;\r\n switch (size) {\r\n case 1:\r\n return view.getUint8(pos);\r\n case 2:\r\n return view.getUint16(pos);\r\n case 4:\r\n return view.getUint32(pos);\r\n }\r\n }\r\n /**\r\n * Read string by char code from Uint8Array\r\n * @param size\r\n */\r\n readString(size: 4, pos = 0) {\r\n let s = \"\";\r\n for (let i = 0; i < size; i++) {\r\n s += String.fromCharCode(this.readUint(1, pos + i));\r\n }\r\n return s;\r\n }\r\n parse() {\r\n // 检查this.stream 的长度是否足够 2*4*8\r\n if (this.stream.length < 8) {\r\n return; // Not Enough\r\n }\r\n\r\n const size = this.readUint(4);\r\n const type = this.readString(4, 4);\r\n\r\n if (size <= this.stream.length) {\r\n const tBuf = this.slice(size);\r\n\r\n const BoxClass = Boxes[type as keyof typeof Boxes] || Boxes.free;\r\n this.boxs.push(new BoxClass(tBuf));\r\n\r\n this.parse(); // 继续向后解析\r\n }\r\n }\r\n\r\n end() {\r\n this.isEnd = true;\r\n }\r\n}\r\n","import { Mp4Stream } from \"./Mp4Stream.class\";\r\nimport * as Boxes from \"./boxes.class\";\r\n\r\nexport default function remux(vs: ReadableStream, as: ReadableStream) {\r\n // 读取两个stream的数据\r\n const videoReader = vs.getReader();\r\n const audioReader = as.getReader();\r\n\r\n const videoStream = new Mp4Stream();\r\n const audioStream = new Mp4Stream();\r\n\r\n const { readable, writable } = new TransformStream();\r\n const writer = writable.getWriter();\r\n\r\n let status = -1;\r\n\r\n function callWrite(buf: Uint8Array) {\r\n writer.write(buf);\r\n }\r\n\r\n async function checkStream() {\r\n if (status === -1) {\r\n // 合并 moov 中的 track 信息\r\n const videoMoov = videoStream.moov;\r\n const audioMoov = audioStream.moov;\r\n if (videoMoov && audioMoov) {\r\n\r\n const videoMvex = videoMoov.mvex;\r\n const audioMvex = audioMoov.mvex;\r\n if (videoMvex && audioMvex) {\r\n const videoTrex = videoMvex.trex;\r\n const audioTrex = audioMvex.trex;\r\n\r\n videoTrex.track_id = 1;\r\n audioTrex.track_id = 2;\r\n\r\n // console.log(videoMvex, audioMvex);\r\n videoMvex.boxs = videoMvex.boxs.filter(item=>!(item instanceof Boxes.trex));\r\n videoTrex && videoMvex.boxs.push(videoTrex);\r\n audioTrex && videoMvex.boxs.push(audioTrex);\r\n }\r\n\r\n const videoTrak = videoMoov.trak;\r\n const audioTrak = audioMoov.trak;\r\n if (videoTrak && audioTrak) {\r\n videoTrak.tkhd.track_id = 1;\r\n audioTrak.tkhd.track_id = 2;\r\n\r\n videoMoov.boxs.push(audioTrak);\r\n for (const item of videoStream.boxs) {\r\n callWrite(item.raw);\r\n if (item === videoMoov) {\r\n break;\r\n }\r\n }\r\n status = 1;\r\n }\r\n }\r\n }\r\n\r\n // 需要先有 sidx\r\n if (!videoStream.sidx || !audioStream.sidx) {\r\n return;\r\n }\r\n\r\n if (status !== -1) {\r\n const videoMaxIndex = videoStream.sidx.reference_count;\r\n const audioMaxIndex = audioStream.sidx.reference_count;\r\n if (status <= videoMaxIndex && status <= audioMaxIndex) {\r\n // 合并\r\n\r\n // Step1 获取需要的分片数据\r\n const videoMoof = videoStream.boxs.find((item) => {\r\n return (\r\n item instanceof Boxes.moof && item?.mfhd.sequence_number === status\r\n );\r\n }) as Boxes.moof;\r\n const audioMoof = audioStream.boxs.find((item) => {\r\n return (\r\n item instanceof Boxes.moof && item?.mfhd.sequence_number === status\r\n );\r\n }) as Boxes.moof;\r\n const videoData = videoMoof && (videoStream.boxs[videoStream.boxs.indexOf(videoMoof) + 1] as Boxes.mdat);\r\n const audioData = audioMoof && (audioStream.boxs[audioStream.boxs.indexOf(audioMoof) + 1] as Boxes.mdat);\r\n\r\n if (videoMoof && videoData && audioMoof && audioData) {\r\n // 处理合并流程\r\n const videoTraf = videoMoof.traf;\r\n const audioTraf = audioMoof.traf;\r\n\r\n videoTraf.tfhd.track_id = 1;\r\n audioTraf.tfhd.track_id = 2;\r\n if (videoTraf?.trun && audioTraf?.trun) {\r\n const audioTrafSize = audioTraf.size;\r\n const videoMoofSize = videoMoof.size;\r\n const videoDataSize = videoData.size;\r\n videoTraf.trun.data_offset = videoMoofSize + audioTrafSize + 8;\r\n audioTraf.trun.data_offset = videoMoofSize + audioTrafSize + videoDataSize;\r\n\r\n videoMoof.boxs.push(audioTraf);\r\n\r\n callWrite(videoMoof.raw);\r\n\r\n // 处理 mdat 合并\r\n videoData.push(audioData.raw.slice(8));\r\n callWrite(videoData.raw);\r\n\r\n // 释放存储空间\r\n videoStream.boxs = videoStream.boxs.filter((item) => item !== videoMoof);\r\n videoStream.boxs = videoStream.boxs.filter((item) => item !== videoData);\r\n audioStream.boxs = audioStream.boxs.filter((item) => item !== audioMoof);\r\n audioStream.boxs = audioStream.boxs.filter((item) => item !== audioData);\r\n\r\n status += 1;\r\n checkStream();\r\n }\r\n }\r\n } else if (status > videoMaxIndex && status <= audioMaxIndex) {\r\n // 追加 audio\r\n const audioMoof = audioStream.boxs.find((item) => {\r\n return (\r\n item instanceof Boxes.moof && item?.mfhd.sequence_number === status\r\n );\r\n }) as Boxes.moof;\r\n audioMoof.traf.tfhd.track_id = 2;\r\n const audioData = audioMoof && (audioStream.boxs[audioStream.boxs.indexOf(audioMoof) + 1] as Boxes.mdat);\r\n if (audioMoof && audioData) {\r\n callWrite(audioMoof.raw);\r\n callWrite(audioData.raw);\r\n status += 1;\r\n checkStream();\r\n }\r\n } else if (status > audioMaxIndex && status <= videoMaxIndex) {\r\n // 追加 Video\r\n const videoMoof = videoStream.boxs.find((item) => {\r\n return (\r\n item instanceof Boxes.moof && item?.mfhd.sequence_number === status\r\n );\r\n }) as Boxes.moof;\r\n videoMoof.traf.tfhd.track_id = 1;\r\n const videoData = videoMoof && (videoStream.boxs[videoStream.boxs.indexOf(videoMoof) + 1] as Boxes.mdat);\r\n if (videoMoof && videoData) {\r\n callWrite(videoMoof.raw);\r\n callWrite(videoData.raw);\r\n status += 1;\r\n checkStream();\r\n }\r\n } else if (status > videoMaxIndex && status > audioMaxIndex) {\r\n // end\r\n status = -2;\r\n // console.log(\"call close\", status, videoMaxIndex, audioMaxIndex);\r\n // writer.releaseLock();\r\n writer.close();\r\n }\r\n }\r\n }\r\n\r\n // 并行读取两个reader的数据\r\n async function readerHandler(streamReader: ReadableStreamDefaultReader, mp4Stream: Mp4Stream) {\r\n while (true) {\r\n const { done, value } = await streamReader.read();\r\n if (value) {\r\n mp4Stream.push(value);\r\n mp4Stream.parse();\r\n\r\n checkStream();\r\n }\r\n // 将value拼接到 chunk后\r\n\r\n if (done) {\r\n mp4Stream.end();\r\n checkStream();\r\n break;\r\n }\r\n }\r\n }\r\n\r\n readerHandler(videoReader, videoStream);\r\n readerHandler(audioReader, audioStream);\r\n return readable;\r\n}\r\n"]}