trun.js

BoxParser.createFullBoxCtor("trun", function(stream) {
	var readBytes = 0;
	this.sample_count = stream.readUint32();
	readBytes+= 4;
	if (this.size - this.hdr_size > readBytes && (this.flags & BoxParser.TRUN_FLAGS_DATA_OFFSET) ) {
		this.data_offset = stream.readInt32(); //signed
		readBytes += 4;
	} else {
		this.data_offset = 0;
	}
	if (this.size - this.hdr_size > readBytes && (this.flags & BoxParser.TRUN_FLAGS_FIRST_FLAG) ) {
		this.first_sample_flags = stream.readUint32();
		readBytes += 4;
	} else {
		this.first_sample_flags = 0;
	}
	this.sample_duration = [];
	this.sample_size = [];
	this.sample_flags = [];
	this.sample_composition_time_offset = [];
	if (this.size - this.hdr_size > readBytes) {
		for (var i = 0; i < this.sample_count; i++) {
			if (this.flags & BoxParser.TRUN_FLAGS_DURATION) {
				this.sample_duration[i] = stream.readUint32();
			}
			if (this.flags & BoxParser.TRUN_FLAGS_SIZE) {
				this.sample_size[i] = stream.readUint32();
			}
			if (this.flags & BoxParser.TRUN_FLAGS_FLAGS) {
				this.sample_flags[i] = stream.readUint32();
			}
			if (this.flags & BoxParser.TRUN_FLAGS_CTS_OFFSET) {
				if (this.version === 0) {
					this.sample_composition_time_offset[i] = stream.readUint32();
				} else {
					this.sample_composition_time_offset[i] = stream.readInt32(); //signed
				}
			}
		}
	}
});