mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2026-11-06 13:28:17 +00:00
Michael Niedermayer
58892c922e
These filters never access pixel data based on the size or format of their input link, so frames that change size or format after the graph was configured pass through them unharmed. Marking them keeps the common -reinit_filter 0 chains working. Found during triage of the security report RqgTntCAW2qN.
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* CEA-708 Closed Caption Repacker
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* Copyright (c) 2023 LTN Global Communications
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*
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* Author: Devin Heitmueller <dheitmueller@ltnglobal.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Repackage CEA-708 arrays, which deals with incorrect cc_count for a given
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* output framerate, and incorrect 708 padding.
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*
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* See CEA CEA-10-A "EIA-708-B Implementation Guidance", Section 26.5
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* "Grouping DTVCC Data Within user_data() Structure"
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*/
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#include "avfilter.h"
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#include "filters.h"
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#include "ccfifo.h"
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#include "video.h"
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#include "libavutil/opt.h"
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typedef struct CCRepackContext
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{
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const AVClass *class;
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CCFifo cc_fifo;
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} CCRepackContext;
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static const AVOption ccrepack_options[] = {
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(ccrepack);
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static int config_input(AVFilterLink *link)
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{
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FilterLink *l = ff_filter_link(link);
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CCRepackContext *ctx = link->dst->priv;
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int ret = ff_ccfifo_init(&ctx->cc_fifo, l->frame_rate, ctx);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failure to setup CC FIFO queue\n");
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return ret;
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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CCRepackContext *ctx = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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ff_ccfifo_extract(&ctx->cc_fifo, frame);
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ff_ccfifo_inject(&ctx->cc_fifo, frame);
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return ff_filter_frame(outlink, frame);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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CCRepackContext *s = ctx->priv;
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ff_ccfifo_uninit(&s->cc_fifo);
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}
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static const AVFilterPad avfilter_vf_ccrepack_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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};
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const FFFilter ff_vf_ccrepack = {
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.p.name = "ccrepack",
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.p.description = NULL_IF_CONFIG_SMALL("Repack CEA-708 closed caption metadata"),
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.p.priv_class = &ccrepack_class,
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.uninit = uninit,
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.priv_size = sizeof(CCRepackContext),
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FILTER_INPUTS(avfilter_vf_ccrepack_inputs),
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FILTER_OUTPUTS(ff_video_default_filterpad),
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.flags_internal = FF_FILTER_FLAG_DYNAMIC_FRAME_PARAMS,
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};
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