Made to Order Software Corporation - encoding

VideoFrame

Alexis Wilke — Thu, 17 Dec 2009 06:46:55 +0000

Tag Info

Tag Number:

Tag Type:

Define

Tag Flash Version:

Tag Structure:

struct swf_startsound {
	swf_tag			f_tag;		/* 61 */
	unsigned short		f_video_id_ref;
	unsigned short		f_frame;
	unsigned char		f_video_data[variable size];
};

The VideoFrame tag is used to render one frame. It includes the data of exactly one video frame to be drawn on the screen.

The f_object_id_ref parameter is a reference to a DefineVideoStream.

DefineEditText

Alexis Wilke — Wed, 16 Dec 2009 23:40:22 +0000

Tag Info

Tag Number:

Tag Type:

Define

Tag Flash Version:

Tag Structure:

struct swf_defineedittext {
	swf_tag			f_tag;		/* 37 */
	unsigned short		f_edit_id;
	swf_rect		f_rect;
	unsigned		f_edit_has_text : 1;
	unsigned		f_edit_word_wrap : 1;
	unsigned		f_edit_multiline : 1;
	unsigned		f_edit_password : 1;
	unsigned		f_edit_readonly : 1;
	unsigned		f_edit_has_color : 1;
	unsigned		f_edit_has_max_length : 1;
	unsigned		f_edit_has_font : 1;
	if(version >= 6) {
		unsigned		f_edit_reserved : 1;
		unsigned		f_edit_auto_size : 1;
	}
	else {
		unsigned		f_edit_reserved : 2;
	}
	unsigned		f_edit_has_layout : 1;
	unsigned		f_edit_no_select : 1;
	unsigned		f_edit_border : 1;
	unsigned		f_edit_reserved : 1;
	unsigned		f_edit_html : 1;
	unsigned		f_edit_use_outlines : 1;
	if(f_edit_has_font) {
		unsigned short		f_edit_font_id_ref;
		unsigned short		f_edit_font_height;
	}
	if(f_edit_has_color) {
		swf_rgba		f_edit_color;
	}
	if(f_edit_has_max_length) {
		unsigned short		f_edit_max_length;
	}
	if(f_edit_has_layout) {
		unsigned char		f_edit_align;
		unsigned short		f_edit_left_margin;
		unsigned short		f_edit_right_margin;
		signed short		f_edit_indent;
		signed short		f_edit_leading;
	}
	string			f_edit_variable_name;
	if(f_edit_has_text) {
		string			f_edit_initial_text;
	}
};

Appendix A — The geometry in SWF — Edges

Alexis Wilke — Sun, 13 Dec 2009 08:02:03 +0000

Edges are used to define a shape vector based and also coordinates where images need to be drawn. The edges are always coordinates from where ever your last point was to where ever you want the next point to be (a little like a turtle in LOGO).

DefineSound

Alexis Wilke — Sun, 29 Nov 2009 23:57:55 +0000

Tag Info

Tag Number:

Tag Type:

Define

Tag Flash Version:

Tag Structure:

struct swf_definesound {
	swf_tag			f_tag;		/* 14 */
	unsigned short		f_sound_id;
	unsigned		f_sound_format : 4;
	unsigned		f_sound_rate : 2;
	unsigned		f_sound_is_16bits : 1;
	unsigned		f_sound_is_stereo : 1;
	unsigned long		f_sound_samples_count;
	unsigned char		f_sound_data[<variable size>];
};

A DefineSound tag declares a set of samples of a sound effect or a music.

The sound samples can be compressed or not, stereo or not and 8 or 16 bits. The different modes are not all available in version 2, although the same tag is used in newer versions with additional capabilities.

The f_sound_is_16bits is always set to 1 (16bits samples) if the samples are compressed (neither Raw nor Uncompressed).

DefineFontInfo

Alexis Wilke — Sun, 29 Nov 2009 11:49:13 +0000

Tag Info

Tag Number:

Tag Type:

Define

Tag Flash Version:

Tag Structure:

struct swf_definefontinfo {
	swf_tag			f_tag;		/* 13 or 62 */
	unsigned short		f_font_info_id_ref;
	unsigned char		f_font_info_name_length;
	unsigned char		f_font_info_name[f_name_length];
	if(version >= 7 && f_tag.f_tag == DefineFontInfo2) {
		unsigned		f_font_info_reserved : 2;
		unsigned		f_font_info_small_text : 1;
		unsigned		f_font_info_reserved : 2;
	}
	else if(version >= 6 && f_tag.f_tag == DefineFontInfo2) {
		unsigned		f_font_info_reserved : 5;
	}
	else {
		unsigned		f_font_info_reserved : 2;
		unsigned		f_font_info_unicode : 1;
		unsigned		f_font_info_shiftjis : 1;
		unsigned		f_font_info_ansii : 1;
	}
	unsigned		f_font_info_italic : 1;
	unsigned		f_font_info_bold : 1;
	unsigned		f_font_info_wide : 1;	/* always 1 in v6.x+ */
	if(version >= 6 && f_tag.f_tag == DefineFontInfo2) {
		unsigned char		f_font_info_language;
	}
	if(f_font_info_wide) {
		unsigned short		f_font_info_map[f_font_glyphs_count];
	}
	else {
		unsigned char		f_font_info_map[f_font_glyphs_count];
	}
};

A DefineFontInfo tag will be used to complete the definition of a DefineFont tag. It uses the exact same identifier (f_font_info_id_ref = f_font_id). You must have the corresponding font definition appearing before the DefineFontInfo since it will use the number of glyphs defined in the DefineFont to know the size of the map definition in the DefineFontInfo tag.

JPEGTables

Alexis Wilke — Sun, 29 Nov 2009 09:55:53 +0000

Tag Info

Tag Number:

Tag Type:

Define

Tag Flash Version:

Tag Structure:

struct swf_jpegtables {
	swf_tag			f_tag;		/* 8 */
	unsigned char		f_encoding_tables[<variable size>];
};

DefineBitsJPEG

Alexis Wilke — Sun, 29 Nov 2009 09:26:02 +0000

Tag Info

Tag Number:

Tag Type:

Define

Tag Flash Version:

Tag Structure:

struct swf_definebitsjpeg {
	swf_long_tag		f_tag;		/* 6, 21, 35 or 90 */
	unsigned short		f_image_id;
	if(f_tag == DefineBitsJPEG3 + f_tag == DefineBitsJPEG4) {
		/* sizeof(f_encoding_tables) + sizeof(f_image_data) + 2 when JPEG4 */
		unsigned long		f_offset_to_alpha;
	}
	if(f_tag == DefineBitsJPEG4) {
		unsigned short fixed	f_deblocking_filter_parameter;
	}
	if(f_tag != DefineBitsJPEG) {
		/* when DefineBitsJPEG, use JPEGTables instead */
		unsigned char		f_encoding_tables[<variable size>];
	}
	unsigned char		f_image_data[<variable size>];
	if(f_tag == DefineBitsJPEG3 || f_tag == DefineBitsJPEG41) {
		unsigned char		f_alpha[<variable size>];
	}
};

1. JPEG4 optionally accepts the f_alpha field. [To be verified]

Change the encoding of a Postgres database

Alexis Wilke — Mon, 15 Sep 2008 19:15:00 +0000

Ever wondered how you could change the encoding of one of your Postgres database?

I have had that problem several times, and in most cases people tell you to: