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a41fb3c6df
This new element allows decoding and overlaying CEA-708 Closed Caption streams over video. * Supports CDP and cc_data closedcaption/x-cea-708 streams * Uses pango to render CC stream * Support GstVideoOverlayComposition meta if downstream supports is Tested on various test files. Remains to be fixed/improved: * Switch to GstByteReader (for code safety) * Switch to GString (instead of manual pango string construction) * Move pango/rendering code outside of main 708 decoder file (so that actual CC parser/decoder can be (re)used in other scenarios). Initial patches and improvements by: * CableLabs RUIH-RI Team <ruihri@cablelabs.com> * Steve Maynard <steve@secondstryke.com> * cjun.wang" <cjun.wang@samsung.com> https://bugzilla.gnome.org/show_bug.cgi?id=704881
137 lines
4 KiB
C
137 lines
4 KiB
C
/* GStreamer
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* Copyright (C) 2015 Samsung Electronics Co., Ltd.
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* @Author: Chengjun Wang <cjun.wang@samsung.com>
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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_CEA_CC_OVERLAY_H__
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#define __GST_CEA_CC_OVERLAY_H__
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#include <gst/gst.h>
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#include <pango/pangocairo.h>
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#include <gstcea708decoder.h>
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G_BEGIN_DECLS
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#define GST_TYPE_CEA_CC_OVERLAY \
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(gst_cea_cc_overlay_get_type())
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#define GST_CEA_CC_OVERLAY(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CEA_CC_OVERLAY,GstCeaCcOverlay))
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#define GST_CEA_CC_OVERLAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CEA_CC_OVERLAY,GstCeaCcOverlayClass))
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#define GST_CEA_CC_OVERLAY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),\
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GST_TYPE_CEA_CC_OVERLAY, GstCeaCcOverlayClass))
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#define GST_IS_CEA_CC_OVERLAY(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CEA_CC_OVERLAY))
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#define GST_IS_CEA_CC_OVERLAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CEA_CC_OVERLAY))
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typedef struct _GstCeaCcOverlay GstCeaCcOverlay;
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typedef struct _GstCeaCcOverlayClass GstCeaCcOverlayClass;
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typedef enum
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{
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CCTYPE_608_CC1 = 0,
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CCTYPE_608_CC2,
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CCTYPE_708_ADD,
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CCTYPE_708_START,
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} DtvccType;
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/**
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* GstBaseTextOverlayHAlign:
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* @GST_CEA_CC_OVERLAY_WIN_H_LEFT: closed caption window horizontal anchor left
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* @GST_CEA_CC_OVERLAY_WIN_H_CENTER: closed caption window horizontal anchor center
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* @GST_CEA_CC_OVERLAY_WIN_H_RIGHT: closed caption window horizontal anchor right
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* @GST_CEA_CC_OVERLAY_WIN_H_AUTO: closed caption window horizontal anchor auto
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*
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* Closed Caption Window Horizontal anchor position.
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*/
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typedef enum
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{
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GST_CEA_CC_OVERLAY_WIN_H_LEFT,
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GST_CEA_CC_OVERLAY_WIN_H_CENTER,
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GST_CEA_CC_OVERLAY_WIN_H_RIGHT,
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GST_CEA_CC_OVERLAY_WIN_H_AUTO
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} GstCeaCcOverlayWinHPos;
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/**
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* GstCeaCcOverlay:
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*
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* Opaque ccoverlay data structure.
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*/
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struct _GstCeaCcOverlay
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{
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GstElement parent;
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GstPad *video_sinkpad;
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GstPad *cc_sinkpad;
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GstPad *srcpad;
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/* There are two possible 608 streams encapsulated by 708 */
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gint16 cea608_index[NUM_608_CCTYPES];
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gint16 cea708_index;
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guint8 cea608_buffer[NUM_608_CCTYPES][DTVCC_LENGTH];
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guint8 cea708_buffer[DTVCC_LENGTH];
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/* TRUE if input is CDP, FALSE if cc_data triplet */
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gboolean is_cdp;
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GstSegment segment;
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GstSegment cc_segment;
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GstVideoOverlayComposition *current_composition;
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guint64 current_comp_start_time;
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GstVideoOverlayComposition *next_composition;
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guint64 next_comp_start_time;
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GstCeaCcOverlayWinHPos default_window_h_pos;
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gboolean cc_pad_linked;
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gboolean video_flushing;
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gboolean video_eos;
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gboolean cc_flushing;
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gboolean cc_eos;
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GMutex lock;
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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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GstVideoInfo info;
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GstVideoFormat format;
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gint width;
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gint height;
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gboolean silent;
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Cea708Dec *decoder;
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gint image_width;
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gint image_height;
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gboolean need_update;
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gboolean attach_compo_to_buffer;
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};
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/* FIXME : Pango context and MT-safe since 1.32.6 */
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struct _GstCeaCcOverlayClass
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{
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GstElementClass parent_class;
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PangoContext *pango_context;
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GMutex *pango_lock;
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};
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GType gst_cea_cc_overlay_get_type (void);
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G_END_DECLS
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#endif /* __GST_CEA_CC_OVERLAY_H__ */
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