mirror of
https://github.com/jellyfin/jellyfin-ffmpeg.git
synced 2024-11-23 13:59:45 +00:00
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
|
|
* CEA-708 Closed Caption Repacker
|
|
* Copyright (c) 2023 LTN Global Communications
|
|
*
|
|
* Author: Devin Heitmueller <dheitmueller@ltnglobal.com>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/*
|
|
* Repackage CEA-708 arrays, which deals with incorrect cc_count for a given
|
|
* output framerate, and incorrect 708 padding.
|
|
*
|
|
* See CEA CEA-10-A "EIA-708-B Implementation Guidance", Section 26.5
|
|
* "Grouping DTVCC Data Within user_data() Structure"
|
|
*/
|
|
|
|
#include "avfilter.h"
|
|
#include "internal.h"
|
|
#include "ccfifo.h"
|
|
#include "video.h"
|
|
#include "libavutil/opt.h"
|
|
|
|
typedef struct CCRepackContext
|
|
{
|
|
const AVClass *class;
|
|
CCFifo cc_fifo;
|
|
} CCRepackContext;
|
|
|
|
static const AVOption ccrepack_options[] = {
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(ccrepack);
|
|
|
|
static int config_input(AVFilterLink *link)
|
|
{
|
|
CCRepackContext *ctx = link->dst->priv;
|
|
|
|
int ret = ff_ccfifo_init(&ctx->cc_fifo, link->frame_rate, ctx);
|
|
if (ret < 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "Failure to setup CC FIFO queue\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
|
|
{
|
|
CCRepackContext *ctx = inlink->dst->priv;
|
|
AVFilterLink *outlink = inlink->dst->outputs[0];
|
|
|
|
ff_ccfifo_extract(&ctx->cc_fifo, frame);
|
|
ff_ccfifo_inject(&ctx->cc_fifo, frame);
|
|
|
|
return ff_filter_frame(outlink, frame);
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
CCRepackContext *s = ctx->priv;
|
|
ff_ccfifo_uninit(&s->cc_fifo);
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_ccrepack_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_input,
|
|
},
|
|
};
|
|
|
|
const AVFilter ff_vf_ccrepack = {
|
|
.name = "ccrepack",
|
|
.description = NULL_IF_CONFIG_SMALL("Repack CEA-708 closed caption metadata"),
|
|
.uninit = uninit,
|
|
.priv_size = sizeof(CCRepackContext),
|
|
.priv_class = &ccrepack_class,
|
|
FILTER_INPUTS(avfilter_vf_ccrepack_inputs),
|
|
FILTER_OUTPUTS(ff_video_default_filterpad),
|
|
};
|