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Add a parser (ttmlparse) and renderer (ttmlrender) element that handle subtitles that use the EBU-TT-D profile of TTML1. https://bugzilla.gnome.org/show_bug.cgi?id=758232
592 lines
22 KiB
C
592 lines
22 KiB
C
/* GStreamer
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* Copyright (C) <2015> British Broadcasting Corporation
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* Author: Chris Bass <dash@rd.bbc.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_SUBTITLE_H__
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#define __GST_SUBTITLE_H__
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#include <glib.h>
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#include <gst/gst.h>
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#include <gst/gstminiobject.h>
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G_BEGIN_DECLS
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typedef struct _GstSubtitleColor GstSubtitleColor;
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typedef struct _GstSubtitleStyleSet GstSubtitleStyleSet;
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typedef struct _GstSubtitleElement GstSubtitleElement;
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typedef struct _GstSubtitleBlock GstSubtitleBlock;
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typedef struct _GstSubtitleRegion GstSubtitleRegion;
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/**
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* GstSubtitleWritingMode:
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* @GST_SUBTITLE_WRITING_MODE_LRTB: Text progression is left-to-right,
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* top-to-bottom.
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* @GST_SUBTITLE_WRITING_MODE_RLTB: Text progression is right-to-left,
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* top-to-bottom.
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* @GST_SUBTITLE_WRITING_MODE_TBRL: Text progression is top-to-bottom,
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* right-to-left.
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* @GST_SUBTITLE_WRITING_MODE_TBLR: Text progression is top-to-bottom,
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* left-to-right.
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*
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* Writing mode of text content. The values define the direction of progression
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* of both inline text (#GstSubtitleElements) and blocks of text
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* (#GstSubtitleBlocks).
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*/
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typedef enum {
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GST_SUBTITLE_WRITING_MODE_LRTB,
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GST_SUBTITLE_WRITING_MODE_RLTB,
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GST_SUBTITLE_WRITING_MODE_TBRL,
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GST_SUBTITLE_WRITING_MODE_TBLR
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} GstSubtitleWritingMode;
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/**
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* GstSubtitleDisplayAlign:
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* @GST_SUBTITLE_DISPLAY_ALIGN_BEFORE: Blocks should be aligned at the start of
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* the containing region.
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* @GST_SUBTITLE_DISPLAY_ALIGN_CENTER: Blocks should be aligned in the center
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* of the containing region.
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* @GST_SUBTITLE_DISPLAY_ALIGN_AFTER: Blocks should be aligned to the end of
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* the containing region.
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*
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* Defines the alignment of text blocks within a region in the direction in
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* which blocks are being stacked. For text that is written left-to-right and
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* top-to-bottom, this corresponds to the vertical alignment of text blocks.
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*/
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typedef enum {
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GST_SUBTITLE_DISPLAY_ALIGN_BEFORE,
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GST_SUBTITLE_DISPLAY_ALIGN_CENTER,
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GST_SUBTITLE_DISPLAY_ALIGN_AFTER
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} GstSubtitleDisplayAlign;
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/**
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* GstSubtitleBackgroundMode:
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* @GST_SUBTITLE_BACKGROUND_MODE_ALWAYS: Background rectangle should be visible
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* at all times.
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* @GST_SUBTITLE_BACKGROUND_MODE_WHEN_ACTIVE: Background rectangle should be
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* visible only when text is rendered into the corresponding region.
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*
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* Defines whether the background rectangle of a region should be visible at
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* all times or only when text is rendered within it.
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*/
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typedef enum {
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GST_SUBTITLE_BACKGROUND_MODE_ALWAYS,
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GST_SUBTITLE_BACKGROUND_MODE_WHEN_ACTIVE
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} GstSubtitleBackgroundMode;
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/**
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* GstSubtitleOverflowMode:
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* @GST_SUBTITLE_OVERFLOW_MODE_HIDDEN: If text and/or background rectangles
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* flowed into the region overflow the bounds of that region, they should
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* be clipped at the region boundary.
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* @GST_SUBTITLE_OVERFLOW_MODE_VISIBLE: If text and/or background rectangles
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* flowed into the region overflow the bounds of that region, they should be
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* allowed to overflow the region boundary.
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*
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* Defines what should happen to text that overflows its containing region.
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*/
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typedef enum {
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GST_SUBTITLE_OVERFLOW_MODE_HIDDEN,
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GST_SUBTITLE_OVERFLOW_MODE_VISIBLE
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} GstSubtitleOverflowMode;
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/**
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* GstSubtitleColor:
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* @r: Red value.
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* @g: Green value.
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* @b: Blue value.
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* @a: Alpha value (0 = totally transparent; 255 = totally opaque).
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*
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* Describes an RGBA color.
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*/
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struct _GstSubtitleColor {
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guint8 r;
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guint8 g;
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guint8 b;
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guint8 a;
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};
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/**
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* GstSubtitleTextDirection:
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* @GST_SUBTITLE_TEXT_DIRECTION_LTR: Text direction is left-to-right.
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* @GST_SUBTITLE_TEXT_DIRECTION_RTL: Text direction is right-to-left.
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*
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* Defines the progression direction of unicode text that is being treated by
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* the unicode bidirectional algorithm as embedded or overidden (see
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* http://unicode.org/reports/tr9/ for more details of the unicode
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* bidirectional algorithm).
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*/
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typedef enum {
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GST_SUBTITLE_TEXT_DIRECTION_LTR,
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GST_SUBTITLE_TEXT_DIRECTION_RTL
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} GstSubtitleTextDirection;
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/**
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* GstSubtitleTextAlign:
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* @GST_SUBTITLE_TEXT_ALIGN_START: Text areas should be rendered at the
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* start of the block area, with respect to the direction in which text is
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* being rendered. For text that is rendered left-to-right this corresponds to
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* the left of the block area; for text that is rendered right-to-left this
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* corresponds to the right of the block area.
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* @GST_SUBTITLE_TEXT_ALIGN_LEFT: Text areas should be rendered at the left of
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* the block area.
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* @GST_SUBTITLE_TEXT_ALIGN_CENTER: Text areas should be rendered at the center
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* of the block area.
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* @GST_SUBTITLE_TEXT_ALIGN_RIGHT: Text areas should be rendered at the right
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* of the block area.
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* @GST_SUBTITLE_TEXT_ALIGN_END: Text areas should be rendered at the end of
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* the block area, with respect to the direction in which text is being
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* rendered. For text that is rendered left-to-right this corresponds to the
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* right of the block area; for text that is rendered right-to-left this
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* corresponds to end of the block area.
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*
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* Defines how inline text areas within a block should be aligned within the
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* block area.
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*/
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typedef enum {
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GST_SUBTITLE_TEXT_ALIGN_START,
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GST_SUBTITLE_TEXT_ALIGN_LEFT,
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GST_SUBTITLE_TEXT_ALIGN_CENTER,
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GST_SUBTITLE_TEXT_ALIGN_RIGHT,
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GST_SUBTITLE_TEXT_ALIGN_END
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} GstSubtitleTextAlign;
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/**
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* GstSubtitleFontStyle:
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* @GST_SUBTITLE_FONT_STYLE_NORMAL: Normal font style.
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* @GST_SUBTITLE_FONT_STYLE_ITALIC: Italic font style.
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*
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* Defines styling that should be applied to the glyphs of a font used to
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* render text within an inline text element.
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*/
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typedef enum {
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GST_SUBTITLE_FONT_STYLE_NORMAL,
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GST_SUBTITLE_FONT_STYLE_ITALIC
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} GstSubtitleFontStyle;
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/**
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* GstSubtitleFontWeight:
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* @GST_SUBTITLE_FONT_WEIGHT_NORMAL: Normal weight.
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* @GST_SUBTITLE_FONT_WEIGHT_BOLD: Bold weight.
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*
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* Defines the font weight that should be applied to the glyphs of a font used
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* to render text within an inline text element.
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*/
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typedef enum {
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GST_SUBTITLE_FONT_WEIGHT_NORMAL,
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GST_SUBTITLE_FONT_WEIGHT_BOLD
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} GstSubtitleFontWeight;
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/**
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* GstSubtitleTextDecoration:
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* @GST_SUBTITLE_TEXT_DECORATION_NONE: Text should not be decorated.
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* @GST_SUBTITLE_TEXT_DECORATION_UNDERLINE: Text should be underlined.
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*
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* Defines the decoration that should be applied to the glyphs of a font used
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* to render text within an inline text element.
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*/
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typedef enum {
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GST_SUBTITLE_TEXT_DECORATION_NONE,
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GST_SUBTITLE_TEXT_DECORATION_UNDERLINE
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} GstSubtitleTextDecoration;
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/**
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* GstSubtitleUnicodeBidi:
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* @GST_SUBTITLE_UNICODE_BIDI_NORMAL: Text should progress according the the
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* default behaviour of the Unicode bidirectional algorithm.
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* @GST_SUBTITLE_UNICODE_BIDI_EMBED: Text should be treated as being embedded
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* with a specific direction (given by a #GstSubtitleTextDecoration value
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* defined elsewhere).
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* @GST_SUBTITLE_UNICODE_BIDI_OVERRIDE: Text should be forced to have a
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* specific direction (given by a #GstSubtitleTextDecoration value defined
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* elsewhere).
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*
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* Defines directional embedding or override according to the Unicode
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* bidirectional algorithm. See http://unicode.org/reports/tr9/ for more
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* details of the Unicode bidirectional algorithm.
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*/
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typedef enum {
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GST_SUBTITLE_UNICODE_BIDI_NORMAL,
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GST_SUBTITLE_UNICODE_BIDI_EMBED,
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GST_SUBTITLE_UNICODE_BIDI_OVERRIDE
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} GstSubtitleUnicodeBidi;
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/**
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* GstSubtitleWrapping:
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* @GST_SUBTITLE_WRAPPING_ON: Lines that overflow the region boundary should be
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* wrapped.
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* @GST_SUBTITLE_WRAPPING_OFF: Lines that overflow the region boundary should
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* not be wrapped.
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*
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* Defines how a renderer should treat lines of text that overflow the boundary
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* of the region into which they are being rendered.
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*/
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typedef enum {
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GST_SUBTITLE_WRAPPING_ON,
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GST_SUBTITLE_WRAPPING_OFF
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} GstSubtitleWrapping;
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/**
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* GstSubtitleMultiRowAlign:
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* @GST_SUBTITLE_MULTI_ROW_ALIGN_AUTO: Lines should be aligned according to the
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* value of #GstSubtitleTextAlign associated with that text.
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* @GST_SUBTITLE_MULTI_ROW_ALIGN_START: Lines should be aligned at their
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* starting edge. The edge that is considered the starting edge depends upon
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* the direction of that text.
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* @GST_SUBTITLE_MULTI_ROW_ALIGN_CENTER: Lines should be center-aligned.
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* @GST_SUBTITLE_MULTI_ROW_ALIGN_END: Lines should be aligned at their trailing
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* edge. The edge that is considered the trailing edge depends upon the
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* direction of that text.
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*
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* Defines how multiple 'rows' (i.e, lines) in a block should be aligned
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* relative to each other.
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*
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* This is based upon the ebutts:multiRowAlign attribute defined in the
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* EBU-TT-D specification.
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*/
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typedef enum {
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GST_SUBTITLE_MULTI_ROW_ALIGN_AUTO,
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GST_SUBTITLE_MULTI_ROW_ALIGN_START,
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GST_SUBTITLE_MULTI_ROW_ALIGN_CENTER,
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GST_SUBTITLE_MULTI_ROW_ALIGN_END
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} GstSubtitleMultiRowAlign;
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/**
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* GstSubtitleStyleSet:
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* @text_direction: Defines the direction of text that has been declared by the
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* #GstSubtitleStyleSet:unicode_bidi attribute to be embbedded or overridden.
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* Applies to both #GstSubtitleBlocks and #GstSubtitleElements.
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* @font_family: The name of the font family that should be used to render the
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* text of an inline element. Applies only to #GstSubtitleElements.
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* @font_size: The size of the font that should be used to render the text
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* of an inline element. The size is given as a multiple of the display height,
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* where 1.0 equals the height of the display. Applies only to
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* #GstSubtitleElements.
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* @line_height: The inter-baseline separation between lines generated when
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* rendering inline text elements within a block area. The height is given as a
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* multiple of the the overall display height, where 1.0 equals the height of
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* the display. Applies only to #GstSubtitleBlocks.
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* @text_align: Controls the alignent of lines of text within a block area.
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* Note that this attribute does not control the alignment of lines relative to
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* each other within a block area: that is determined by
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* #GstSubtitleStyleSet:multi_row_align. Applies only to #GstSubtitleBlocks.
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* @color: The color that should be used when rendering the text of an inline
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* element. Applies only to #GstSubtitleElements.
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* @background_color: The color of the rectangle that should be rendered behind
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* the contents of a #GstSubtitleRegion, #GstSubtitleBlock or
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* #GstSubtitleElement.
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* @font_style: The style of the font that should be used to render the text
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* of an inline element. Applies only to #GstSubtitleElements.
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* @font_weight: The weight of the font that should be used to render the text
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* of an inline element. Applies only to #GstSubtitleElements.
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* @text_decoration: The decoration that should be applied to the text of an
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* inline element. Applies only to #GstSubtitleElements.
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* @unicode_bidi: Controls how unicode text within a block or inline element
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* should be treated by the unicode bidirectional algorithm. Applies to both
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* #GstSubtitleBlocks and #GstSubtitleElements.
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* @wrap_option: Defines whether or not automatic line breaking should apply to
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* the lines generated when rendering a block of text elements. Applies only to
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* #GstSubtitleBlocks.
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* @multi_row_align: Defines how 'rows' (i.e., lines) within a text block
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* should be aligned relative to each other. Note that this attribute does not
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* determine how a block of text is aligned within that block area: that is
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* determined by @text_align. Applies only to #GstSubtitleBlocks.
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* @line_padding: Defines how much horizontal padding should be added on the
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* start and end of each rendered line; this allows the insertion of space
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* between the start/end of text lines and their background rectangles for
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* better-looking subtitles. This is based upon the ebutts:linePadding
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* attribute defined in the EBU-TT-D specification. Applies only to
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* #GstSubtitleBlocks.
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* @origin_x: The horizontal origin of a region into which text blocks may be
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* rendered. Given as a multiple of the overall display width, where 1.0 equals
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* the width of the display. Applies only to #GstSubtitleRegions.
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* @origin_y: The vertical origin of a region into which text blocks may be
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* rendered. Given as a multiple of the overall display height, where 1.0
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* equals the height of the display. Applies only to #GstSubtitleRegions.
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* @extent_w: The horizontal extent of a region into which text blocks may be
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* rendered. Given as a multiple of the overall display width, where 1.0 equals
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* the width of the display. Applies only to #GstSubtitleRegions.
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* @extent_h: The vertical extent of a region into which text blocks may be
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* rendered. Given as a multiple of the overall display height, where 1.0
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* equals the height of the display. Applies only to #GstSubtitleRegions.
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* @display_align: The alignment of generated text blocks in the direction in
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* which blocks are being stacked. For text that flows left-to-right and
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* top-to-bottom, for example, this corresponds to the vertical alignment of
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* text blocks. Applies only to #GstSubtitleRegions.
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* @padding_start: The horizontal indent of text from the leading edge of a
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* region into which blocks may be rendered. Given as a multiple of the overall
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* display width, where 1.0 equals the width of the display. Applies only to
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* #GstSubtitleRegions.
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* @padding_end: The horizontal indent of text from the trailing edge of a
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* region into which blocks may be rendered. Given as a multiple of the overall
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* display width, where 1.0 equals the width of the display. Applies only to
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* #GstSubtitleRegions.
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* @padding_before: The vertical indent of text from the top edge of a region
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* into which blocks may be rendered. Given as a multiple of the overall
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* display height, where 1.0 equals the height of the display. Applies only to
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* #GstSubtitleRegions.
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* @padding_after: The vertical indent of text from the bottom edge of a
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* region into which blocks may be rendered. Given as a multiple of the overall
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* display height, where 1.0 equals the height of the display. Applies only to
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* #GstSubtitleRegions.
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* @writing_mode: Defines the direction in which both inline elements and
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* blocks should be stacked when rendered into an on-screen region. Applies
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* only to #GstSubtitleRegions.
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* @show_background: Defines whether the background of a region should be
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* displayed at all times or only when it has text rendered into it. Applies
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* only to #GstSubtitleRegions.
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* @overflow: Defines what should happen if text and background rectangles
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* generated by rendering text blocks overflow the size of their containing
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* region. Applies only to #GstSubtitleRegions.
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*
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* Holds a set of attributes that describes the styling and layout that apply
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* to #GstSubtitleRegion, #GstSubtitleBlock and/or #GstSubtitleElement objects.
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*
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* Note that, though each of the above object types have an associated
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* #GstSubtitleStyleSet, not all attributes in a #GstSubtitleStyleSet type
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* apply to all object types: #GstSubtitleStyleSet:overflow applies only to
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* #GstSubtitleRegions, for example, while #GstSubtitleStyleSet:font_style
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* applies only to #GstSubtitleElements. Some attributes apply to multiple
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* object types: #GstSubtitleStyleSet:background_color, for example, applies to
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* all object types. The types to which each attribute applies is given in the
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* description of that attribute below.
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*/
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struct _GstSubtitleStyleSet {
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GstSubtitleTextDirection text_direction;
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gchar *font_family;
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gdouble font_size;
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gdouble line_height;
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GstSubtitleTextAlign text_align;
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GstSubtitleColor color;
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GstSubtitleColor background_color;
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GstSubtitleFontStyle font_style;
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GstSubtitleFontWeight font_weight;
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GstSubtitleTextDecoration text_decoration;
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GstSubtitleUnicodeBidi unicode_bidi;
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GstSubtitleWrapping wrap_option;
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GstSubtitleMultiRowAlign multi_row_align;
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gdouble line_padding;
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gdouble origin_x, origin_y;
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gdouble extent_w, extent_h;
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GstSubtitleDisplayAlign display_align;
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gdouble padding_start, padding_end, padding_before, padding_after;
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GstSubtitleWritingMode writing_mode;
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GstSubtitleBackgroundMode show_background;
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GstSubtitleOverflowMode overflow;
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};
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GstSubtitleStyleSet * gst_subtitle_style_set_new (void);
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void gst_subtitle_style_set_free (GstSubtitleStyleSet * style_set);
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/**
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* GstSubtitleElement:
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* @mini_object: The parent #GstMiniObject.
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* @style_set: Styling associated with this element.
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* @text_index: Index into the #GstBuffer associated with this
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* #GstSubtitleElement; the index identifies the #GstMemory within the
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* #GstBuffer that holds the #GstSubtitleElement's text.
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* @suppress_whitespace: Indicates whether or not a renderer should suppress
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* whitespace in the element's text.
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*
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* Represents an inline text element.
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*
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* In TTML this would correspond to inline text resulting from a <span>
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* element, an anonymous span (e.g., text within a <p> tag), or a
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* <br> element.
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*/
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struct _GstSubtitleElement
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{
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GstMiniObject mini_object;
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GstSubtitleStyleSet *style_set;
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guint text_index;
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gboolean suppress_whitespace;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_subtitle_element_get_type (void);
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GstSubtitleElement * gst_subtitle_element_new (GstSubtitleStyleSet * style_set,
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guint text_index, gboolean suppress_whitespace);
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/**
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* gst_subtitle_element_ref:
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* @element: A #GstSubtitleElement.
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*
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* Increments the refcount of @element.
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*
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* Returns: (transfer full): @element.
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*/
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static inline GstSubtitleElement *
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gst_subtitle_element_ref (GstSubtitleElement * element)
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{
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return (GstSubtitleElement *)
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gst_mini_object_ref (GST_MINI_OBJECT_CAST (element));
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}
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/**
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* gst_subtitle_element_unref:
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* @element: (transfer full): A #GstSubtitleElement.
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*
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* Decrements the refcount of @element. If the refcount reaches 0, @element
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* will be freed.
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*/
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static inline void
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gst_subtitle_element_unref (GstSubtitleElement * element)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (element));
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}
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/**
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* GstSubtitleBlock:
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* @mini_object: The parent #GstMiniObject.
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* @style_set: Styling associated with this block.
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*
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* Represents a text block made up of one or more inline text elements (i.e.,
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* one or more #GstSubtitleElements).
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*
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* In TTML this would correspond to the block of text resulting from the inline
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* elements within a single <p>.
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*/
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struct _GstSubtitleBlock
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{
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GstMiniObject mini_object;
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GstSubtitleStyleSet *style_set;
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/*< private >*/
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GPtrArray *elements;
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_subtitle_block_get_type (void);
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GstSubtitleBlock * gst_subtitle_block_new (GstSubtitleStyleSet * style_set);
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void gst_subtitle_block_add_element (
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GstSubtitleBlock * block,
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GstSubtitleElement * element);
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guint gst_subtitle_block_get_element_count (const GstSubtitleBlock * block);
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const GstSubtitleElement * gst_subtitle_block_get_element (
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const GstSubtitleBlock * block, guint index);
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/**
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* gst_subtitle_block_ref:
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* @block: A #GstSubtitleBlock.
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*
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* Increments the refcount of @block.
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*
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* Returns: (transfer full): @block.
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*/
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static inline GstSubtitleBlock *
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gst_subtitle_block_ref (GstSubtitleBlock * block)
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{
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return (GstSubtitleBlock *)
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gst_mini_object_ref (GST_MINI_OBJECT_CAST (block));
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}
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/**
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* gst_subtitle_block_unref:
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* @block: (transfer full): A #GstSubtitleBlock.
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*
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* Decrements the refcount of @block. If the refcount reaches 0, @block will
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* be freed.
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*/
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static inline void
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gst_subtitle_block_unref (GstSubtitleBlock * block)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (block));
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}
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/**
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* GstSubtitleRegion:
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* @mini_object: The parent #GstMiniObject.
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* @style_set: Styling associated with this region.
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*
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* Represents an on-screen region in which is displayed zero or more
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* #GstSubtitleBlocks.
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*
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* In TTML this corresponds to a <region> into which zero or more
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* <p>s may be rendered. A #GstSubtitleRegion allows a background
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* rectangle to be displayed in a region area even if no text blocks are
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* rendered into it, as per the behaviour allowed by TTML regions whose
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* tts:showBackground style attribute is set to "always".
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*/
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struct _GstSubtitleRegion
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{
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GstMiniObject mini_object;
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GstSubtitleStyleSet *style_set;
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/*< private >*/
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GPtrArray *blocks;
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_subtitle_region_get_type (void);
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GstSubtitleRegion * gst_subtitle_region_new (GstSubtitleStyleSet * style_set);
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void gst_subtitle_region_add_block (
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GstSubtitleRegion * region,
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GstSubtitleBlock * block);
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guint gst_subtitle_region_get_block_count (const GstSubtitleRegion * region);
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const GstSubtitleBlock * gst_subtitle_region_get_block (
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const GstSubtitleRegion * region, guint index);
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/**
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* gst_subtitle_region_ref:
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* @region: A #GstSubtitleRegion.
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*
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* Increments the refcount of @region.
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*
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* Returns: (transfer full): @region.
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*/
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static inline GstSubtitleRegion *
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gst_subtitle_region_ref (GstSubtitleRegion * region)
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{
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return (GstSubtitleRegion *)
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gst_mini_object_ref (GST_MINI_OBJECT_CAST (region));
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}
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/**
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* gst_subtitle_region_unref:
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* @region: (transfer full): A #GstSubtitleRegion.
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*
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* Decrements the refcount of @region. If the refcount reaches 0, @region will
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* be freed.
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*/
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static inline void
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gst_subtitle_region_unref (GstSubtitleRegion * region)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (region));
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}
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G_END_DECLS
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#endif /* __GST_SUBTITLE_H__ */
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