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-rw-r--r--chromium/chrome/browser/resources/file_manager/foreground/js/metadata/mpeg_parser.js317
1 files changed, 0 insertions, 317 deletions
diff --git a/chromium/chrome/browser/resources/file_manager/foreground/js/metadata/mpeg_parser.js b/chromium/chrome/browser/resources/file_manager/foreground/js/metadata/mpeg_parser.js
deleted file mode 100644
index 03637cff6ad..00000000000
--- a/chromium/chrome/browser/resources/file_manager/foreground/js/metadata/mpeg_parser.js
+++ /dev/null
@@ -1,317 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-/**
- * @param {MetadataDispatcher} parent Parent object.
- * @constructor
- */
-function MpegParser(parent) {
- MetadataParser.call(this, parent, 'mpeg', /\.(mp4|m4v|m4a|mpe?g4?)$/i);
- this.mimeType = 'video/mpeg';
-}
-
-MpegParser.prototype = {__proto__: MetadataParser.prototype};
-
-/**
- * Size of the atom header.
- */
-MpegParser.HEADER_SIZE = 8;
-
-/**
- * @param {ByteReader} br ByteReader instance.
- * @param {number=} opt_end End of atom position.
- * @return {number} Atom size.
- */
-MpegParser.readAtomSize = function(br, opt_end) {
- var pos = br.tell();
-
- if (opt_end) {
- // Assert that opt_end <= buffer end.
- // When supplied, opt_end is the end of the enclosing atom and is used to
- // check the correct nesting.
- br.validateRead(opt_end - pos);
- }
-
- var size = br.readScalar(4, false, opt_end);
-
- if (size < MpegParser.HEADER_SIZE)
- throw 'atom too short (' + size + ') @' + pos;
-
- if (opt_end && pos + size > opt_end)
- throw 'atom too long (' + size + '>' + (opt_end - pos) + ') @' + pos;
-
- return size;
-};
-
-/**
- * @param {ByteReader} br ByteReader instance.
- * @param {number=} opt_end End of atom position.
- * @return {string} Atom name.
- */
-MpegParser.readAtomName = function(br, opt_end) {
- return br.readString(4, opt_end).toLowerCase();
-};
-
-/**
- * @param {Object} metadata Metadata object.
- * @return {Object} Root of the parser tree.
- */
-MpegParser.createRootParser = function(metadata) {
- function findParentAtom(atom, name) {
- for (;;) {
- atom = atom.parent;
- if (!atom) return null;
- if (atom.name == name) return atom;
- }
- }
-
- function parseFtyp(br, atom) {
- metadata.brand = br.readString(4, atom.end);
- }
-
- function parseMvhd(br, atom) {
- var version = br.readScalar(4, false, atom.end);
- var offset = (version == 0) ? 8 : 16;
- br.seek(offset, ByteReader.SEEK_CUR);
- var timescale = br.readScalar(4, false, atom.end);
- var duration = br.readScalar(4, false, atom.end);
- metadata.duration = duration / timescale;
- }
-
- function parseHdlr(br, atom) {
- br.seek(8, ByteReader.SEEK_CUR);
- findParentAtom(atom, 'trak').trackType = br.readString(4, atom.end);
- }
-
- function parseStsd(br, atom) {
- var track = findParentAtom(atom, 'trak');
- if (track && track.trackType == 'vide') {
- br.seek(40, ByteReader.SEEK_CUR);
- metadata.width = br.readScalar(2, false, atom.end);
- metadata.height = br.readScalar(2, false, atom.end);
- }
- }
-
- function parseDataString(name, br, atom) {
- br.seek(8, ByteReader.SEEK_CUR);
- metadata[name] = br.readString(atom.end - br.tell(), atom.end);
- }
-
- function parseCovr(br, atom) {
- br.seek(8, ByteReader.SEEK_CUR);
- metadata.thumbnailURL = br.readImage(atom.end - br.tell(), atom.end);
- }
-
- // 'meta' atom can occur at one of the several places in the file structure.
- var parseMeta = {
- ilst: {
- '©nam': { data: parseDataString.bind(null, 'title') },
- '©alb': { data: parseDataString.bind(null, 'album') },
- '©art': { data: parseDataString.bind(null, 'artist') },
- 'covr': { data: parseCovr }
- },
- versioned: true
- };
-
- // main parser for the entire file structure.
- return {
- ftyp: parseFtyp,
- moov: {
- mvhd: parseMvhd,
- trak: {
- mdia: {
- hdlr: parseHdlr,
- minf: {
- stbl: {
- stsd: parseStsd
- }
- }
- },
- meta: parseMeta
- },
- udta: {
- meta: parseMeta
- },
- meta: parseMeta
- },
- meta: parseMeta
- };
-};
-
-/**
- *
- * @param {File} file File.
- * @param {Object} metadata Metadata.
- * @param {function(Object)} callback Success callback.
- * @param {function} onError Error callback.
- */
-MpegParser.prototype.parse = function(file, metadata, callback, onError) {
- this.rootParser_ = MpegParser.createRootParser(metadata);
-
- // Kick off the processing by reading the first atom's header.
- this.requestRead(file, 0, MpegParser.HEADER_SIZE, null,
- onError, callback.bind(null, metadata));
-};
-
-/**
- * @param {function(ByteReader, Object)|Object} parser Parser tree node.
- * @param {ByteReader} br ByteReader instance.
- * @param {Object} atom Atom descriptor.
- * @param {number} filePos File position of the atom start.
- */
-MpegParser.prototype.applyParser = function(parser, br, atom, filePos) {
- if (this.verbose) {
- var path = atom.name;
- for (var p = atom.parent; p && p.name; p = p.parent) {
- path = p.name + '.' + path;
- }
-
- var action;
- if (!parser) {
- action = 'skipping ';
- } else if (parser instanceof Function) {
- action = 'parsing ';
- } else {
- action = 'recursing';
- }
-
- var start = atom.start - MpegParser.HEADER_SIZE;
- this.vlog(path + ': ' +
- '@' + (filePos + start) + ':' + (atom.end - start),
- action);
- }
-
- if (parser) {
- if (parser instanceof Function) {
- br.pushSeek(atom.start);
- parser(br, atom);
- br.popSeek();
- } else {
- if (parser.versioned) {
- atom.start += 4;
- }
- this.parseMpegAtomsInRange(parser, br, atom, filePos);
- }
- }
-};
-
-/**
- * @param {function(ByteReader, Object)|Object} parser Parser tree node.
- * @param {ByteReader} br ByteReader instance.
- * @param {Object} parentAtom Parent atom descriptor.
- * @param {number} filePos File position of the atom start.
- */
-MpegParser.prototype.parseMpegAtomsInRange = function(
- parser, br, parentAtom, filePos) {
- var count = 0;
- for (var offset = parentAtom.start; offset != parentAtom.end;) {
- if (count++ > 100) // Most likely we are looping through a corrupt file.
- throw 'too many child atoms in ' + parentAtom.name + ' @' + offset;
-
- br.seek(offset);
- var size = MpegParser.readAtomSize(br, parentAtom.end);
- var name = MpegParser.readAtomName(br, parentAtom.end);
-
- this.applyParser(
- parser[name],
- br,
- { start: offset + MpegParser.HEADER_SIZE,
- end: offset + size,
- name: name,
- parent: parentAtom
- },
- filePos
- );
-
- offset += size;
- }
-};
-
-/**
- * @param {File} file File.
- * @param {number} filePos Start position in the file.
- * @param {number} size Atom size.
- * @param {string} name Atom name.
- * @param {function} onError Error callback.
- * @param {function} onSuccess Success callback.
- */
-MpegParser.prototype.requestRead = function(
- file, filePos, size, name, onError, onSuccess) {
- var self = this;
- var reader = new FileReader();
- reader.onerror = onError;
- reader.onload = function(event) {
- self.processTopLevelAtom(
- reader.result, file, filePos, size, name, onError, onSuccess);
- };
- this.vlog('reading @' + filePos + ':' + size);
- reader.readAsArrayBuffer(file.slice(filePos, filePos + size));
-};
-
-/**
- * @param {ArrayBuffer} buf Data buffer.
- * @param {File} file File.
- * @param {number} filePos Start position in the file.
- * @param {number} size Atom size.
- * @param {string} name Atom name.
- * @param {function} onError Error callback.
- * @param {function} onSuccess Success callback.
- */
-MpegParser.prototype.processTopLevelAtom = function(
- buf, file, filePos, size, name, onError, onSuccess) {
- try {
- var br = new ByteReader(buf);
-
- // the header has already been read.
- var atomEnd = size - MpegParser.HEADER_SIZE;
-
- var bufLength = buf.byteLength;
-
- // Check the available data size. It should be either exactly
- // what we requested or HEADER_SIZE bytes less (for the last atom).
- if (bufLength != atomEnd && bufLength != size) {
- throw 'Read failure @' + filePos + ', ' +
- 'requested ' + size + ', read ' + bufLength;
- }
-
- // Process the top level atom.
- if (name) { // name is null only the first time.
- this.applyParser(
- this.rootParser_[name],
- br,
- {start: 0, end: atomEnd, name: name},
- filePos
- );
- }
-
- filePos += bufLength;
- if (bufLength == size) {
- // The previous read returned everything we asked for, including
- // the next atom header at the end of the buffer.
- // Parse this header and schedule the next read.
- br.seek(-MpegParser.HEADER_SIZE, ByteReader.SEEK_END);
- var nextSize = MpegParser.readAtomSize(br);
- var nextName = MpegParser.readAtomName(br);
-
- // If we do not have a parser for the next atom, skip the content and
- // read only the header (the one after the next).
- if (!this.rootParser_[nextName]) {
- filePos += nextSize - MpegParser.HEADER_SIZE;
- nextSize = MpegParser.HEADER_SIZE;
- }
-
- this.requestRead(file, filePos, nextSize, nextName, onError, onSuccess);
- } else {
- // The previous read did not return the next atom header, EOF reached.
- this.vlog('EOF @' + filePos);
- onSuccess();
- }
- } catch (e) {
- onError(e.toString());
- }
-};
-
-MetadataDispatcher.registerParserClass(MpegParser);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-07 16:47:11 +0000