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/*****************************************************************
* gmerlin - a general purpose multimedia framework and applications
*
* Copyright (c) 2001 - 2024 Members of the Gmerlin project
* http://github.com/bplaum
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <gavl/gavl.h>
#include <gavl/connectors.h>
#include <gmerlin/subtitle.h>
#include <gmerlin/log.h>
#include <gmerlin/utils.h>
#define LOG_DOMAIN "subtitle"
// #define DUMP_SUBTITLE
struct bg_subtitle_handler_s
{
gavl_video_format_t video_format;
gavl_video_format_t ovl_format;
gavl_video_source_t * src;
gavl_video_sink_t * sink;
gavl_video_frame_t * cur;
gavl_video_frame_t * next;
gavl_video_frame_t * ovl[2];
// gavl_video_frame_t * out_ovl;
int eof;
int active; // Current subtitle is active
};
bg_subtitle_handler_t * bg_subtitle_handler_create()
{
bg_subtitle_handler_t * ret;
ret = calloc(1, sizeof(*ret));
return ret;
}
void bg_subtitle_handler_destroy(bg_subtitle_handler_t * h)
{
free(h);
}
void bg_subtitle_handler_init(bg_subtitle_handler_t * h,
gavl_video_format_t * video_format,
gavl_video_source_t * src,
gavl_video_sink_t * sink)
{
if(h->ovl[0])
{
gavl_video_frame_destroy(h->ovl[0]);
h->ovl[0] = NULL;
}
if(h->ovl[1])
{
gavl_video_frame_destroy(h->ovl[1]);
h->ovl[1] = NULL;
}
h->src = src;
h->sink = sink;
if(!h->src || !h->sink)
return;
gavl_video_format_copy(&h->ovl_format,
gavl_video_sink_get_format(h->sink));
gavl_video_source_set_dst(h->src, 0, &h->ovl_format);
gavl_video_format_copy(&h->video_format, video_format);
h->ovl[0] = gavl_video_frame_create(&h->ovl_format);
h->ovl[1] = gavl_video_frame_create(&h->ovl_format);
h->cur = h->ovl[0];
h->next = h->ovl[1];
bg_subtitle_handler_reset(h);
}
static void read_subtitle(bg_subtitle_handler_t * h,
gavl_video_frame_t * frame)
{
gavl_source_status_t st;
if((frame->src_rect.w > 0) || h->eof)
return;
st = gavl_video_source_read_frame(h->src, &frame);
if(st == GAVL_SOURCE_EOF)
{
h->eof = 1;
gavl_log(GAVL_LOG_INFO, LOG_DOMAIN, "Subtitle stream finished");
}
if(st == GAVL_SOURCE_OK)
{
#ifdef DUMP_SUBTITLE
bg_dprintf("Got subtitle\n");
gavl_video_frame_dump_metadata(gavl_video_source_get_dst_format(h->src),
frame);
#endif
}
}
static void put_overlay(bg_subtitle_handler_t * h)
{
h->active = 1;
gavl_video_sink_put_frame(h->sink, h->cur);
#ifdef DUMP_SUBTITLE
bg_dprintf("Put subtitle\n");
gavl_video_frame_dump_metadata(gavl_video_source_get_dst_format(h->src),
h->cur);
#endif
}
static void clear_overlay(bg_subtitle_handler_t * h)
{
h->active = 0;
h->cur->src_rect.w = 0;
gavl_video_sink_put_frame(h->sink, h->cur);
#ifdef DUMP_SUBTITLE
bg_dprintf("Clear subtitle\n");
#endif
}
void bg_subtitle_handler_update(bg_subtitle_handler_t * h, int64_t current_time)
{
gavl_video_frame_t * swp;
gavl_time_t frame_start;
gavl_time_t overlay_start;
gavl_time_t overlay_end;
frame_start = gavl_time_unscale(h->video_format.timescale, current_time);
/* Check if the subtitle is expired */
if(h->active && (h->cur->duration > 0))
{
overlay_end = gavl_time_unscale(h->ovl_format.timescale,
h->cur->timestamp + h->cur->duration);
if(frame_start > overlay_end)
{
clear_overlay(h);
/* Swap */
swp = h->cur;
h->cur = h->next;
h->next = swp;
}
}
/* Read as many subtitles as possible */
read_subtitle(h, h->cur);
read_subtitle(h, h->next);
/* Check if the current subtitle became valid */
if(!h->active && h->cur->src_rect.w)
{
overlay_start = gavl_time_unscale(h->ovl_format.timescale,
h->cur->timestamp);
if(overlay_start <= frame_start)
put_overlay(h);
}
/* Check if the next subtitle became valid */
else if(h->next->src_rect.w)
{
overlay_start = gavl_time_unscale(h->ovl_format.timescale,
h->next->timestamp);
if(overlay_start <= frame_start)
{
h->cur->src_rect.w = 0;
/* Swap */
swp = h->cur;
h->cur = h->next;
h->next = swp;
put_overlay(h);
}
}
}
void bg_subtitle_handler_reset(bg_subtitle_handler_t * h)
{
if(h->active)
clear_overlay(h);
h->cur->src_rect.w = 0;
h->cur->src_rect.h = 0;
h->next->src_rect.w = 0;
h->next->src_rect.h = 0;
h->active = 0;
h->eof = 0;
}
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