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const ID3Definitions = require("./ID3Definitions") |
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const ID3Frames = require('./ID3Frames') |
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const ID3Util = require('./ID3Util') |
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const ID3Frame = require('./ID3Frame') |
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const ID3FrameHeader = require('./ID3FrameHeader') |
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/** |
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* Returns array of buffers created by tags specified in the tags argument |
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* @param tags - Object containing tags to be written |
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* @returns {Array} |
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*/ |
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function createBuffersFromTags(tags) { |
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const frames = [] |
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if(!tags) { |
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return frames |
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} |
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const rawObject = Object.keys(tags).reduce((acc, val) => { |
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if(ID3Definitions.FRAME_IDENTIFIERS.v3[val] !== undefined) { |
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acc[ID3Definitions.FRAME_IDENTIFIERS.v3[val]] = tags[val] |
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} else if(ID3Definitions.FRAME_IDENTIFIERS.v4[val] !== undefined) { |
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/** |
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* Currently, node-id3 always writes ID3 version 3. |
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* However, version 3 and 4 are very similar, and node-id3 can also read version 4 frames. |
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* Until version 4 is fully supported, as a workaround, allow writing version 4 frames into a version 3 tag. |
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* If a reader does not support a v4 frame, it's (per spec) supposed to skip it, so it should not be a problem. |
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*/ |
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acc[ID3Definitions.FRAME_IDENTIFIERS.v4[val]] = tags[val] |
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} else { |
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acc[val] = tags[val] |
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} |
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return acc |
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}, {}) |
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Object.keys(rawObject).forEach((frameIdentifier) => { |
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let frame |
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// Check if invalid frameIdentifier |
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if(frameIdentifier.length !== 4) { |
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return |
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} |
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if(ID3Frames[frameIdentifier] !== undefined) { |
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frame = ID3Frames[frameIdentifier].create(rawObject[frameIdentifier], 3) |
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} else if(frameIdentifier.startsWith('T')) { |
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frame = ID3Frames.GENERIC_TEXT.create(frameIdentifier, rawObject[frameIdentifier], 3) |
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} else if(frameIdentifier.startsWith('W')) { |
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if(ID3Util.getSpecOptions(frameIdentifier, 3).multiple && rawObject[frameIdentifier] instanceof Array && rawObject[frameIdentifier].length > 0) { |
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frame = Buffer.alloc(0) |
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// deduplicate array |
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for(const url of [...new Set(rawObject[frameIdentifier])]) { |
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frame = Buffer.concat([frame, ID3Frames.GENERIC_URL.create(frameIdentifier, url, 3)]) |
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} |
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} else { |
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frame = ID3Frames.GENERIC_URL.create(frameIdentifier, rawObject[frameIdentifier], 3) |
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} |
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} |
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if (frame && frame instanceof Buffer) { |
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frames.push(frame) |
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} |
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}) |
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return frames |
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} |
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/** |
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* Return a buffer with the frames for the specified tags |
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* @param tags - Object containing tags to be written |
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* @returns {Buffer} |
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*/ |
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module.exports.createBufferFromTags = function(tags) { |
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return Buffer.concat(createBuffersFromTags(tags)) |
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} |
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module.exports.getTagsFromBuffer = function(filebuffer, options) { |
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const framePosition = ID3Util.getFramePosition(filebuffer) |
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if(framePosition === -1) { |
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return getTagsFromFrames([], 3, options) |
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} |
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const frameSize = ID3Util.decodeSize(filebuffer.slice(framePosition + 6, framePosition + 10)) + 10 |
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const ID3Frame = Buffer.alloc(frameSize + 1) |
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filebuffer.copy(ID3Frame, 0, framePosition) |
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//ID3 version e.g. 3 if ID3v2.3.0 |
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const ID3Version = ID3Frame[3] |
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const tagFlags = ID3Util.parseTagHeaderFlags(ID3Frame) |
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let extendedHeaderOffset = 0 |
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if(tagFlags.extendedHeader) { |
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if(ID3Version === 3) { |
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extendedHeaderOffset = 4 + filebuffer.readUInt32BE(10) |
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} else if(ID3Version === 4) { |
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extendedHeaderOffset = ID3Util.decodeSize(filebuffer.slice(10, 14)) |
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} |
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} |
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const ID3FrameBody = Buffer.alloc(frameSize - 10 - extendedHeaderOffset) |
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filebuffer.copy(ID3FrameBody, 0, framePosition + 10 + extendedHeaderOffset) |
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const frames = getFramesFromTagBody(ID3FrameBody, ID3Version, options) |
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return getTagsFromFrames(frames, ID3Version, options) |
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} |
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function isFrameDiscarded(frameIdentifier, options) { |
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if(options.exclude instanceof Array && options.exclude.includes(frameIdentifier)) { |
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return true |
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} |
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return options.include instanceof Array && !options.include.includes(frameIdentifier) |
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} |
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108
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function getFramesFromTagBody(tagBody, version, options = {}) { |
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if(!(tagBody instanceof Buffer)) { |
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return [] |
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} |
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113
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const frames = [] |
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while(tagBody.length && tagBody[0] !== 0x00) { |
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const frameSize = ID3FrameHeader.getFrameSize(tagBody, version) |
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// Prevent errors due to broken data. |
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if (frameSize > tagBody.length) { |
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break |
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} |
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const frameBuffer = tagBody.subarray(0, frameSize) |
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const frame = ID3Frame.createFromBuffer(frameBuffer, version) |
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if(frame && !isFrameDiscarded(frame.identifier, options)) { |
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frames.push(frame) |
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} |
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tagBody = tagBody.subarray(frameSize) |
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} |
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return frames |
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} |
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function getTagsFromFrames(frames, version, options = {}) { |
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const tags = { } |
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const raw = { } |
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137
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frames.forEach((frame) => { |
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const frameValue = frame.getValue() |
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const frameAlias = ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v3[frame.identifier] || ID3Definitions.FRAME_INTERNAL_IDENTIFIERS.v4[frame.identifier] |
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141
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if(ID3Util.getSpecOptions(frame.identifier, version).multiple) { |
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if(!options.onlyRaw) { |
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if(!tags[frameAlias]) { |
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tags[frameAlias] = [] |
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} |
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tags[frameAlias].push(frameValue) |
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147
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} |
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if(!options.noRaw) { |
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if(!raw[frame.identifier]) { |
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150
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raw[frame.identifier] = [] |
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} |
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raw[frame.identifier].push(frameValue) |
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} |
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154
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} else { |
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if(!options.onlyRaw) { |
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tags[frameAlias] = frameValue |
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} |
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158
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if(!options.noRaw) { |
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raw[frame.identifier] = frameValue |
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160
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} |
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161
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} |
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162
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}) |
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163
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164
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if(options.onlyRaw) { |
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return raw |
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166
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} |
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167
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if(options.noRaw) { |
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168
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return tags |
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169
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} |
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170
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171
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tags.raw = raw |
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return tags |
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173
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} |
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174
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175
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module.exports.getTagsFromID3Body = function(body) { |
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return getTagsFromFrames(getFramesFromTagBody(body, 3), 3) |
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} |
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Zazama /
node-id3
