mp4box/src/parsing/sampleentries/sampleentry.js

JavaScript version of GPAC's MP4Box tool

BoxParser.SAMPLE_ENTRY_TYPE_VISUAL 		= "Visual";
BoxParser.SAMPLE_ENTRY_TYPE_AUDIO 		= "Audio";
BoxParser.SAMPLE_ENTRY_TYPE_HINT 		= "Hint";
BoxParser.SAMPLE_ENTRY_TYPE_METADATA 	= "Metadata";
BoxParser.SAMPLE_ENTRY_TYPE_SUBTITLE 	= "Subtitle";
BoxParser.SAMPLE_ENTRY_TYPE_SYSTEM 		= "System";
BoxParser.SAMPLE_ENTRY_TYPE_TEXT 		= "Text";

BoxParser.SampleEntry.prototype.parseHeader = function(stream) {
	stream.readUint8Array(6);
	this.data_reference_index = stream.readUint16();
	this.hdr_size += 8;
}

BoxParser.SampleEntry.prototype.parse = function(stream) {
	this.parseHeader(stream);
	this.data = stream.readUint8Array(this.size - this.hdr_size);
}

BoxParser.SampleEntry.prototype.parseDataAndRewind = function(stream) {
	this.parseHeader(stream);
	this.data = stream.readUint8Array(this.size - this.hdr_size);
	// restore the header size as if the sample entry header had not been parsed
	this.hdr_size -= 8;
	// rewinding
	stream.position -= this.size-this.hdr_size;
}

BoxParser.SampleEntry.prototype.parseFooter = function(stream) {
	BoxParser.ContainerBox.prototype.parse.call(this, stream);
}

// Base SampleEntry types with default parsing
BoxParser.createMediaSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_HINT);
BoxParser.createMediaSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_METADATA);
BoxParser.createMediaSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_SUBTITLE);
BoxParser.createMediaSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_SYSTEM);
BoxParser.createMediaSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_TEXT);

//Base SampleEntry types for Audio and Video with specific parsing
BoxParser.createMediaSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, function(stream) {
	var compressorname_length;
	this.parseHeader(stream);
	stream.readUint16();
	stream.readUint16();
	stream.readUint32Array(3);
	this.width = stream.readUint16();
	this.height = stream.readUint16();
	this.horizresolution = stream.readUint32();
	this.vertresolution = stream.readUint32();
	stream.readUint32();
	this.frame_count = stream.readUint16();
	compressorname_length = Math.min(31, stream.readUint8());
	this.compressorname = stream.readString(compressorname_length);
	if (compressorname_length < 31) {
		stream.readString(31 - compressorname_length);
	}
	this.depth = stream.readUint16();
	stream.readUint16();
	this.parseFooter(stream);
});

BoxParser.createMediaSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, function(stream) {
	this.parseHeader(stream);
	stream.readUint32Array(2);
	this.channel_count = stream.readUint16();
	this.samplesize = stream.readUint16();
	stream.readUint16();
	stream.readUint16();
	this.samplerate = (stream.readUint32()/(1<<16));
	this.parseFooter(stream);
});

// Sample entries inheriting from Audio and Video
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "avc1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "avc2");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "avc3");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "avc4");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "av01");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "dav1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "hvc1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "hev1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "hvt1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "lhe1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "dvh1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "dvhe");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "vvc1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "vvi1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "vvs1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "vvcN");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "vp08");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "vp09");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "avs3");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "j2ki");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "mjp2");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, "mjpg");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL,	"uncv");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"mp4a");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"ac-3");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"ac-4");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"ec-3");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"Opus");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"mha1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"mha2");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"mhm1");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"mhm2");
BoxParser.createSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"fLaC");

// Encrypted sample entries
BoxParser.createEncryptedSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_VISUAL, 	"encv");
BoxParser.createEncryptedSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_AUDIO, 	"enca");
BoxParser.createEncryptedSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_SUBTITLE, 	"encu");
BoxParser.createEncryptedSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_SYSTEM, 	"encs");
BoxParser.createEncryptedSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_TEXT, 		"enct");
BoxParser.createEncryptedSampleEntryCtor(BoxParser.SAMPLE_ENTRY_TYPE_METADATA, 	"encm");