Quicktime File Format (2012-08-14).pdf

Media Data Atom TypesTimecode MediaSource referenceA user data atom containing information about the source tape. The only currently used user data listentry is the 'name' type. This entry contains a text item specifying the name of the source tape.Timecode Media Information AtomThe timecode media also requires a media information atom. This atom contains information governing howthe timecode text is displayed. This media information atom is stored in a base media information atom (see“Base Media Information Atoms” (page 89) for more information). The type of the timecode media informationatom is 'tcmi'.The timecode media information atom contains the following fields:SizeA 32-bit integer that specifies the number of bytes in this time code media information atom.TypeA 32-bit integer that identifies the atom type; this field must be set to 'tcmi'.VersionA 1-byte specification of the version of this timecode media information atom.FlagsA 3-byte space for timecode media information flags. Set this field to 0.Text fontA 16-bit integer that indicates the font to use. Set this field to 0 to use the system font. If the font namefield contains a valid name, ignore this field.Text faceA 16-bit integer that indicates the font’s style. Set this field to 0 for normal text. You can enable otherstyle options by using one or more of the bit masks listed in Table 4-8 (page 191).Table 4-8Value0x00010x00020x00040x00080x0010Text face valuesMeaningBoldItalicUnderlineOutlineShadow2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.191