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152 lines
4.9 KiB
C
152 lines
4.9 KiB
C
#ifndef __GST_TEXT_OVERLAY_H__
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#define __GST_TEXT_OVERLAY_H__
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#include <gst/gst.h>
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#include <pango/pangoft2.h>
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G_BEGIN_DECLS
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#define GST_TYPE_TEXT_OVERLAY (gst_text_overlay_get_type())
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#define GST_TEXT_OVERLAY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),\
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GST_TYPE_TEXT_OVERLAY, GstTextOverlay))
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#define GST_TEXT_OVERLAY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),\
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GST_TYPE_TEXT_OVERLAY,GstTextOverlayClass))
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#define GST_TEXT_OVERLAY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),\
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GST_TYPE_TEXT_OVERLAY, GstTextOverlayClass))
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#define GST_IS_TEXT_OVERLAY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),\
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GST_TYPE_TEXT_OVERLAY))
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#define GST_IS_TEXT_OVERLAY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),\
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GST_TYPE_TEXT_OVERLAY))
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typedef struct _GstTextOverlay GstTextOverlay;
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typedef struct _GstTextOverlayClass GstTextOverlayClass;
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/**
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* GstTextOverlayVAlign:
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* @GST_TEXT_OVERLAY_VALIGN_BASELINE: draw text on the baseline
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* @GST_TEXT_OVERLAY_VALIGN_BOTTOM: draw text on the bottom
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* @GST_TEXT_OVERLAY_VALIGN_TOP: draw test on top
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*
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* Vertical alignment of the text.
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*/
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typedef enum {
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GST_TEXT_OVERLAY_VALIGN_BASELINE,
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GST_TEXT_OVERLAY_VALIGN_BOTTOM,
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GST_TEXT_OVERLAY_VALIGN_TOP
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} GstTextOverlayVAlign;
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/**
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* GstTextOverlayHAlign:
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* @GST_TEXT_OVERLAY_HALIGN_LEFT: align text left
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* @GST_TEXT_OVERLAY_HALIGN_CENTER: align text center
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* @GST_TEXT_OVERLAY_HALIGN_RIGHT: align text right
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*
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* Horizontal alignment of the text.
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*/
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typedef enum {
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GST_TEXT_OVERLAY_HALIGN_LEFT,
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GST_TEXT_OVERLAY_HALIGN_CENTER,
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GST_TEXT_OVERLAY_HALIGN_RIGHT
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} GstTextOverlayHAlign;
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/**
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* GstTextOverlayWrapMode:
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* @GST_TEXT_OVERLAY_WRAP_MODE_NONE: no wrapping
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* @GST_TEXT_OVERLAY_WRAP_MODE_WORD: do word wrapping
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* @GST_TEXT_OVERLAY_WRAP_MODE_CHAR: do char wrapping
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* @GST_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR: do word and char wrapping
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*
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* Whether to wrap the text and if so how.
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*/
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typedef enum {
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GST_TEXT_OVERLAY_WRAP_MODE_NONE = -1,
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GST_TEXT_OVERLAY_WRAP_MODE_WORD = PANGO_WRAP_WORD,
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GST_TEXT_OVERLAY_WRAP_MODE_CHAR = PANGO_WRAP_CHAR,
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GST_TEXT_OVERLAY_WRAP_MODE_WORD_CHAR = PANGO_WRAP_WORD_CHAR
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} GstTextOverlayWrapMode;
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/**
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* GstTextOverlayLineAlign:
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* @GST_TEXT_OVERLAY_LINE_ALIGN_LEFT: lines are left-aligned
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* @GST_TEXT_OVERLAY_LINE_ALIGN_CENTER: lines are center-aligned
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* @GST_TEXT_OVERLAY_LINE_ALIGN_RIGHT: lines are right-aligned
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*
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* Alignment of text lines relative to each other
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*/
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typedef enum {
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GST_TEXT_OVERLAY_LINE_ALIGN_LEFT = PANGO_ALIGN_LEFT,
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GST_TEXT_OVERLAY_LINE_ALIGN_CENTER = PANGO_ALIGN_CENTER,
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GST_TEXT_OVERLAY_LINE_ALIGN_RIGHT = PANGO_ALIGN_RIGHT
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} GstTextOverlayLineAlign;
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/**
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* GstTextOverlay:
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*
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* Opaque textoverlay object structure
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*/
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struct _GstTextOverlay {
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GstElement element;
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GstPad *video_sinkpad;
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GstPad *text_sinkpad;
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GstPad *srcpad;
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GstSegment *segment;
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GstSegment text_segment;
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GstBuffer *text_buffer;
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gboolean text_linked;
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gboolean video_flushing;
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gboolean video_eos;
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gboolean text_flushing;
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gboolean text_eos;
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GCond *cond; /* to signal removal of a queued text
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* buffer, arrival of a text buffer,
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* a text segment update, or a change
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* in status (e.g. shutdown, flushing) */
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gint width;
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gint height;
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gint fps_n;
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gint fps_d;
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guint32 format;
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GstTextOverlayVAlign valign;
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GstTextOverlayHAlign halign;
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GstTextOverlayWrapMode wrap_mode;
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GstTextOverlayLineAlign line_align;
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gint xpad;
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gint ypad;
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gint deltax;
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gint deltay;
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gchar *default_text;
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gboolean want_shading;
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gboolean silent;
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gboolean wait_text;
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PangoLayout *layout;
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FT_Bitmap bitmap;
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gint bitmap_buffer_size;
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gint baseline_y;
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gboolean need_render;
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gint shading_value; /* for timeoverlay subclass */
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gboolean have_pango_markup;
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};
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struct _GstTextOverlayClass {
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GstElementClass parent_class;
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PangoContext *pango_context;
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gchar * (*get_text) (GstTextOverlay *overlay, GstBuffer *video_frame);
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};
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GType gst_text_overlay_get_type(void) G_GNUC_CONST;
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G_END_DECLS
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#endif /* __GST_TEXT_OVERLAY_H */
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