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

Media Data Atom TypesText MediaControls background color. If this flag is set to 1, the text media handler does not display thebackground color, so that the text overlay background tracks. This flag’s value is 0x4000.Text justificationA 32-bit integer that indicates how the text should be aligned. Set this field to 0 for left-justified text, to1 for centered text, and to –1 for right-justified text.Background colorA 48-bit RGB color that specifies the text’s background color.Default text boxA 64-bit rectangle that specifies an area to receive text (top, left, bottom, right). Typically this field is setto all zeros.ReservedA 64-bit value that must be set to 0.Font numberA 16-bit value that must be set to 0.Font 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 4-9 (page 195).Table 4-9Value0x00010x00020x00040x00080x00100x00200x0040Font face valuesMeaningBoldItalicUnderlineOutlineShadowCondenseExtendReservedAn 8-bit value that must be set to 0.ReservedA 16-bit value that must be set to 0.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.195