X-Git-Url: http://id.pley.net/movie_parser.git/blobdiff_plain/86cb3dcb7102f7c715c323bbd1c62f4f136ddfab..49dd866a06288856e4a1d5df3f00a6a0fccea2fa:/Atom.js

diff --git a/Atom.js b/Atom.js
index 50ba17f..2fc62ef 100644
--- a/Atom.js
+++ b/Atom.js
@@ -1,26 +1,547 @@
 var Atom = function(buffer, offset) {
-    this.size = 0;
-    this.type = '';
-    this.childAtoms = [];
-    
-    return this.parse(buffer, offset)
+    this.setDefaults();
+    return this.parse(buffer, offset) ? this : null;
 };
 
-Atom.prototype.parse = function(buffer, offset)
-{
+Atom.create = function(buffer, offset) {
     // 'offset' is optional.
     if (arguments.length < 2)
         offset = 0;
 
-    // Atoms are 8 bytes minimum.
-    if (buffer.byteLength - offset < 8)
+    if (buffer.byteLength - offset < this.minimumSize)
         return null;
 
+    var typeArrayView = new Uint8Array(buffer, offset + 4, 4);
+    var type = String.fromCharCode.apply(null, typeArrayView);
+
+    switch (type) {
+        case 'ftyp':
+            return new FileTypeAtom(buffer, offset);
+        case 'moov':
+        case 'trak':
+        case 'mdia':
+        case 'minf':
+        case 'stbl':
+            return new ContainerAtom(buffer, offset);
+        case 'mvhd':
+            return new MovieHeaderAtom(buffer, offset);
+        case 'tkhd':
+            return new TrackHeaderAtom(buffer, offset);
+        case 'mdhd':
+            return new MediaHeaderAtom(buffer, offset);
+        case 'stss':
+            return new SyncSampleAtom(buffer, offset);
+        case 'stts':
+            return new TimeToSampleAtom(buffer, offset);
+        default:
+            return new Atom(buffer, offset);
+    }
+}
+
+Atom.prototype.super = function(object) {
+    return Object.getPrototypeOf(object.prototype);
+}
+
+Atom.prototype.setDefaults = function() {
+    Object.defineProperty(this, "is64bit", {
+            value: false,
+            writable: true,
+            enumerable: false,
+            configurable: true,
+        });
+    Object.defineProperty(this, "minimumSize", {
+            value: 8,
+            writable: true,
+            enumerable: false,
+            configurable: true,
+        });
+    Object.defineProperty(this, "parent", {
+            value: null,
+            writable: true,
+            enumerable: false,
+            configurable: true,
+        });
+    this.size = 0;
+    this.type = '';
+}
+
+Atom.prototype.parse = function(buffer, offset) {
+    // 'offset' is optional.
+    if (typeof(offset) == 'undefined')
+        offset = 0;
+
+    if (buffer.byteLength - offset < this.minimumSize)
+        return 0;
+
     var view = new DataView(buffer, offset, 4);
+    headerOffset = 0;
+
     this.size = view.getUint32(0);
+    headerOffset += 4;
 
-    var typeArrayView = new Uint8Array(buffer, offset + 4, 4);
+    var typeArrayView = new Uint8Array(buffer, offset + headerOffset, 4);
     this.type = String.fromCharCode.apply(null, typeArrayView);
+    headerOffset += 4;
+
+    if (this.size == 1) {
+        this.is64bit = true;
+        if (buffer.byteLength - offset < 8)
+            return false;
+
+        // NOTE: JavaScript can only represent up to 2^53 as precise integer.
+        // This calculation may result in incorrect values.
+        var view = new DataView(buffer, offset + headerOffset, 8);
+        var upper = view.getUint32(0);
+        var lower = view.getUint32(4);
+        this.size = (upper << 32)  + lower;
+        headerOffset += 8;
+    }
+
+    return headerOffset;
+};
+
+Atom.prototype.getAtomByType = function(type) {
+    if (typeof(this.childAtoms) == 'undefined')
+        return null;
+
+    // Bredth first
+    for (index in this.childAtoms) {
+        if (this.childAtoms[index].type == type)
+            return this.childAtoms[index];
+    }
+
+    var result = null;
+    for (index in this.childAtoms) {
+        if (result = this.childAtoms[index].getAtomsByType(type))
+            break;
+    }
+    return result;
+};
+
+Atom.prototype.getAtomsByType = function(type) {
+    if (typeof(this.childAtoms) == 'undefined')
+        return [];
+
+    var result = [];
+
+    // Bredth first
+    for (index in this.childAtoms) {
+        if (this.childAtoms[index].type == type)
+            result.push(this.childAtoms[index]);
+    }
+
+    for (index in this.childAtoms)
+        result = result.concat(this.childAtoms[index].getAtomsByType(type));
+
+    return result;
+};
+
+var FileTypeAtom = function(buffer, offset) {
+    this.super(FileTypeAtom).constructor.call(this, buffer, offset);
+}
+
+FileTypeAtom.prototype = Object.create(Atom.prototype);
+
+FileTypeAtom.prototype.setDefaults = function() {
+    this.super(FileTypeAtom).setDefaults.call(this);
+    this.minimumSize = 16;
+    this.brand = "";
+    this.version = 0;
+    this.compatible_brands = [];
+}
+
+FileTypeAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(FileTypeAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    var view = new DataView(buffer, offset, this.size);
+
+    var brandArrayView = new Uint8Array(buffer, offset + headerOffset, 4);
+    this.brand = String.fromCharCode.apply(null, brandArrayView);
+    headerOffset += 4;
+
+    this.version = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    while (headerOffset < this.size - 4) {
+        var brandArrayView = new Uint8Array(buffer, offset + headerOffset, 4);
+        this.compatible_brands.push(String.fromCharCode.apply(null, brandArrayView));
+        headerOffset += 4;
+    }
+
+    return true;
+}
+
+var ContainerAtom = function(buffer, offset) {
+    this.super(ContainerAtom).constructor.call(this, buffer, offset);
+}
+
+ContainerAtom.prototype = Object.create(Atom.prototype);
+
+ContainerAtom.prototype.setDefaults = function() {
+    this.super(ContainerAtom).setDefaults.call(this);
+    this.childAtoms = [];
+}
+
+ContainerAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(ContainerAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    while (headerOffset < this.size) {
+        var childAtom = Atom.create(buffer, offset + headerOffset);
+        if (!childAtom)
+            break;
+        headerOffset += childAtom.size;
+        this.childAtoms.push(childAtom);
+        childAtom.parent = this;
+    }
+}
+
+var VersionFlagsAtom = function(buffer, offset) {
+    this.super(VersionFlagsAtom).constructor.call(this, buffer, offset);
+}
+
+VersionFlagsAtom.prototype = Object.create(Atom.prototype);
+
+VersionFlagsAtom.prototype.setDefaults = function() {
+    this.super(VersionFlagsAtom).setDefaults.call(this);
+    this.version = 0;
+    this.flags = 0;
+}
+
+VersionFlagsAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(VersionFlagsAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    var view = new DataView(buffer, offset);
+
+    this.version = view.getUint8(headerOffset);
+    headerOffset += 1;
+
+    // 'flags' is a 3-byte field, so retrieve from one extra byte and concatenate
+    this.flags = (view.getUint8(headerOffset) << 8) + view.getUint16(headerOffset + 1);
+    headerOffset += 3;
+
+    return headerOffset;
+}
+
+var MovieHeaderAtom = function(buffer, offset) {
+    return this.super(MovieHeaderAtom).constructor.call(this, buffer, offset);
+}
+
+MovieHeaderAtom.prototype = Object.create(VersionFlagsAtom.prototype);
+
+MovieHeaderAtom.prototype.setDefaults = function() {
+    this.super(MovieHeaderAtom).setDefaults.call(this);
+    this.creationTime = 0;
+    this.modificationTime = 0;
+    this.timeScale = 0;
+    this.duration = 0;
+    this.preferredRate = 0.0;
+    this.preferredVolume = 0.0;
+    this.movieMatrix = [[]];
+    this.previewTime = 0;
+    this.posterTime = 0;
+    this.selectionTime = 0;
+    this.selectionDuration = 0;
+    this.nextTrackID = 0;
+}
+
+MovieHeaderAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(MovieHeaderAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    var view = new DataView(buffer, offset);
+
+    this.creationTime = new Date(view.getUint32(headerOffset)*1000 + Date.UTC(1904, 0, 1));
+    headerOffset += 4;
+
+    this.modificationTime = new Date(view.getUint32(headerOffset)*1000 + Date.UTC(1904, 0, 1));
+    headerOffset += 4;
+
+    this.timeScale = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.duration  = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.preferredRate = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+
+    this.preferredVolume = view.getUint16(headerOffset) / (1 << 8);
+    headerOffset += 2;
+
+    // Reserved
+    // Ten bytes reserved for use by Apple. Set to 0.
+    headerOffset += 10;
+
+    this.movieMatrix = new Array(3);
+    // a, b, u:
+    this.movieMatrix[0] = new Array(3);
+    this.movieMatrix[0][0] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.movieMatrix[0][1] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.movieMatrix[0][2] = view.getUint32(headerOffset) / (1 << 30);
+    headerOffset += 4;
+
+    // c, d, v:
+    this.movieMatrix[1] = new Array(3);
+    this.movieMatrix[1][0] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.movieMatrix[1][1] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.movieMatrix[1][2] = view.getUint32(headerOffset) / (1 << 30);
+    headerOffset += 4;
+
+    // x, y, w:
+    this.movieMatrix[2] = new Array(3);
+    this.movieMatrix[2][0] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.movieMatrix[2][1] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.movieMatrix[2][2] = view.getUint32(headerOffset) / (1 << 30);
+    headerOffset += 4;
+
+    this.previewTime = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.previewDuration = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.posterTime = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.selectionTime = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.selectionDuration = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.nextTrackID = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    return true;
+}
+
+var TrackHeaderAtom = function(buffer, offset) {
+    this.super(TrackHeaderAtom).constructor.call(this, buffer, offset);
+}
+
+TrackHeaderAtom.prototype = Object.create(VersionFlagsAtom.prototype);
+
+TrackHeaderAtom.prototype.setDefaults = function() {
+    this.super(TrackHeaderAtom).setDefaults.call(this);
+
+    this.creationTime = 0;
+    this.modificationTime = 0;
+    this.trackID = 0;
+    this.duration = 0;
+    this.layer = 0;
+    this.alternateGroup = 0;
+    this.volume = 0.0;
+    this.trackMatrix = [];
+    this.width = 0;
+    this.height = 0;
+}
+
+TrackHeaderAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(TrackHeaderAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    var view = new DataView(buffer, offset);
+
+    this.creationTime = new Date(view.getUint32(headerOffset)*1000 + Date.UTC(1904, 0, 1));
+    headerOffset += 4;
+
+    this.modificationTime = new Date(view.getUint32(headerOffset)*1000 + Date.UTC(1904, 0, 1));
+    headerOffset += 4;
+
+    this.trackID = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    // Reserved
+    // A 32-bit integer that is reserved for use by Apple. Set this field to 0.
+    headerOffset += 4;
+
+    this.duration = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    // Reserved
+    // An 8-byte value that is reserved for use by Apple. Set this field to 0.
+    headerOffset += 8;
+
+    this.layer = view.getUint16(headerOffset);
+    headerOffset += 2;
+
+    this.alternateGroup = view.getUint16(headerOffset);
+    headerOffset += 2;
+
+    this.volume = view.getUint16(headerOffset) / (1 << 8);
+    headerOffset += 2;
+
+    // Reserved
+    // A 16-bit integer that is reserved for use by Apple. Set this field to 0.
+    headerOffset += 2;
+
+    this.trackMatrix = new Array(3);
+    // a, b, u:
+    this.trackMatrix[0] = new Array(3);
+    this.trackMatrix[0][0] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.trackMatrix[0][1] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.trackMatrix[0][2] = view.getUint32(headerOffset) / (1 << 30);
+    headerOffset += 4;
+
+    // c, d, v:
+    this.trackMatrix[1] = new Array(3);
+    this.trackMatrix[1][0] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.trackMatrix[1][1] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.trackMatrix[1][2] = view.getUint32(headerOffset) / (1 << 30);
+    headerOffset += 4;
+
+    // x, y, w:
+    this.trackMatrix[2] = new Array(3);
+    this.trackMatrix[2][0] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.trackMatrix[2][1] = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+    this.trackMatrix[2][2] = view.getUint32(headerOffset) / (1 << 30);
+    headerOffset += 4;
+
+    this.width = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+
+    this.height = view.getUint32(headerOffset) / (1 << 16);
+    headerOffset += 4;
+}
+
+var MediaHeaderAtom = function(buffer, offset) {
+    this.super(MediaHeaderAtom).constructor.call(this, buffer, offset);
+}
+
+MediaHeaderAtom.prototype = Object.create(VersionFlagsAtom.prototype);
+
+MediaHeaderAtom.prototype.setDefaults = function() {
+    this.super(MediaHeaderAtom).setDefaults.call(this);
+
+    this.creationTime = 0;
+    this.modificationTime = 0;
+    this.timeScale = 0;
+    this.duration = 0;
+    this.language = 0;
+    this.quality = 0;
+}
+
+MediaHeaderAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(MediaHeaderAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    var view = new DataView(buffer, offset);
+
+    this.creationTime = new Date(view.getUint32(headerOffset)*1000 + Date.UTC(1904, 0, 1));
+    headerOffset += 4;
+
+    this.modificationTime = new Date(view.getUint32(headerOffset)*1000 + Date.UTC(1904, 0, 1));
+    headerOffset += 4;
+
+    this.timeScale = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.duration = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    this.language = view.getUint16(headerOffset);
+    headerOffset += 2;
+
+    this.quality = view.getUint16(headerOffset);
+    headerOffset += 2;
+}
+
+var SyncSampleAtom = function(buffer, offset) {
+    this.super(SyncSampleAtom).constructor.call(this, buffer, offset);
+}
+
+SyncSampleAtom.prototype = Object.create(Atom.prototype);
+
+SyncSampleAtom.prototype.setDefaults = function() {
+    this.super(SyncSampleAtom).setDefaults.call(this);
+
+    this.version = 0;
+    this.flags = 0;
+    this.entries = 0;
+    this.syncSamples = [];
+}
+
+SyncSampleAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(SyncSampleAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    var view = new DataView(buffer, offset);
+
+    this.version = view.getUint8(headerOffset);
+    headerOffset += 1;
+
+    // 'flags' is a 3-byte field, so retrieve from one extra byte and concatenate
+    this.flags = (view.getUint8(headerOffset) << 8) + view.getUint16(headerOffset + 1);
+    headerOffset += 3;
+
+    this.entries = view.getUint32(headerOffset);
+    headerOffset += 4;
+
+    while (headerOffset < this.size) {
+        var sampleNumber = view.getUint32(headerOffset);
+        headerOffset += 4;
+        this.syncSamples.push(sampleNumber);
+    }
+}
+
+var TimeToSampleAtom = function(buffer, offset) {
+    this.super(TimeToSampleAtom).constructor.call(this, buffer, offset);
+}
+
+TimeToSampleAtom.prototype = Object.create(VersionFlagsAtom.prototype);
+
+TimeToSampleAtom.prototype.setDefaults = function() {
+    this.super(TimeToSampleAtom).setDefaults.call(this);
+
+    this.entries = 0;
     
-    return this;
-};
\ No newline at end of file
+    Object.defineProperty(this, "timeToSamples", {
+        value: [],
+        writable: true,
+        enumerable: false,
+        configurable: true,
+    });
+}
+
+TimeToSampleAtom.prototype.parse = function(buffer, offset) {
+    var headerOffset = this.super(TimeToSampleAtom).parse.call(this, buffer, offset);
+    if (!headerOffset)
+        return 0;
+
+    var view = new DataView(buffer, offset);
+
+    this.entries = view.getUint32(headerOffset);
+        headerOffset += 4;
+
+    while (headerOffset < this.size) {
+        var sampleCount = view.getUint32(headerOffset);
+        headerOffset += 4;
+
+        var sampleDuration = view.getUint32(headerOffset);
+        headerOffset += 4;
+
+        this.timeToSamples.push([sampleCount, sampleDuration]);
+    }
+}
\ No newline at end of file