gstreamer/ext/assrender/gstassrender.h
Michael Drake bba33533ab assrender: fix multiple subtitles on screen simultaneously
This fixes an issue with SSA/ASS subtitles, where subtitles
would fail to appear if there was already a subtitle on screen.

This was because `struct _GstAssRender` had a single
`GstBuffer *subtitle_pending` member.  This meant that
the assrender context could only be aware of one subtitle
at a time.

This patch changes the subtitle_pending member to a
linked list of pending subtitles.

The `gst_ass_render_chain_text` function no longer needs
to care about whether there are already subtitles pending,
it simply appends new subtitles to the list.

The `gst_ass_render_chain_video` function has been modified
to handle the list of pending subtitles.

Finally, the `gst_ass_render_pop_text` function has been
modified to pop the entire list of pending subtitles.

https://bugzilla.gnome.org/show_bug.cgi?id=735944
2018-08-14 23:00:34 +10:00

99 lines
2.8 KiB
C

/*
* Copyright (c) 2008 Benjamin Schmitz <vortex@wolpzone.de>
* Copyright (c) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __GST_ASS_RENDER_H__
#define __GST_ASS_RENDER_H__
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/video-overlay-composition.h>
#include <ass/ass.h>
#include <ass/ass_types.h>
G_BEGIN_DECLS
#if !defined(LIBASS_VERSION) || LIBASS_VERSION < 0x00907010
#define ASS_Library ass_library_t
#define ASS_Renderer ass_renderer_t
#define ASS_Track ass_track_t
#define ASS_Image ass_image_t
#endif
#define GST_TYPE_ASS_RENDER (gst_ass_render_get_type())
#define GST_ASS_RENDER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ASS_RENDER,GstAssRender))
#define GST_ASS_RENDER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ASS_RENDER,GstAssRenderClass))
#define GST_ASS_RENDER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), \
GST_TYPE_ASS_RENDER, GstAssRenderClass))
#define GST_IS_ASS_RENDER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ASS_RENDER))
#define GST_IS_ASS_RENDER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ASS_RENDER))
typedef struct _GstAssRender GstAssRender;
typedef struct _GstAssRenderClass GstAssRenderClass;
struct _GstAssRender
{
GstElement element;
GstPad *video_sinkpad, *text_sinkpad, *srcpad;
/* properties */
gboolean enable, embeddedfonts;
gboolean wait_text;
/* <private> */
GMutex lock;
GCond cond;
GstSegment video_segment;
gboolean video_flushing;
gboolean video_eos;
GstVideoInfo info;
GSList *subtitle_pending;
gboolean subtitle_flushing;
gboolean subtitle_eos;
GstSegment subtitle_segment;
GMutex ass_mutex;
ASS_Library *ass_library;
ASS_Renderer *ass_renderer;
ASS_Track *ass_track;
gint ass_frame_width, ass_frame_height;
gboolean renderer_init_ok, track_init_ok;
gboolean need_process;
/* overlay stuff */
GstVideoOverlayComposition *composition;
guint window_width, window_height;
gboolean attach_compo_to_buffer;
};
struct _GstAssRenderClass
{
GstElementClass parent_class;
};
GType gst_ass_render_get_type (void);
G_END_DECLS
#endif