2019-12-31 11:00:30 +00:00
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/*
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* Copyright (c) 2019 Paul B Mahol
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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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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "internal.h"
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#include "video.h"
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typedef struct FreezeFramesContext {
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const AVClass *class;
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int64_t first, last, replace;
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AVFrame *replace_frame;
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} FreezeFramesContext;
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#define OFFSET(x) offsetof(FreezeFramesContext, x)
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#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
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static const AVOption freezeframes_options[] = {
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{ "first", "set first frame to freeze", OFFSET(first), AV_OPT_TYPE_INT64, {.i64=0}, 0, INT64_MAX, FLAGS },
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{ "last", "set last frame to freeze", OFFSET(last), AV_OPT_TYPE_INT64, {.i64=0}, 0, INT64_MAX, FLAGS },
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{ "replace", "set frame to replace", OFFSET(replace), AV_OPT_TYPE_INT64, {.i64=0}, 0, INT64_MAX, FLAGS },
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(freezeframes);
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *sourcelink = ctx->inputs[0];
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AVFilterLink *replacelink = ctx->inputs[1];
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if (sourcelink->w != replacelink->w || sourcelink->h != replacelink->h) {
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av_log(ctx, AV_LOG_ERROR,
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"Input frame sizes do not match (%dx%d vs %dx%d).\n",
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sourcelink->w, sourcelink->h,
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replacelink->w, replacelink->h);
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return AVERROR(EINVAL);
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}
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outlink->w = sourcelink->w;
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outlink->h = sourcelink->h;
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outlink->time_base = sourcelink->time_base;
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outlink->sample_aspect_ratio = sourcelink->sample_aspect_ratio;
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outlink->frame_rate = sourcelink->frame_rate;
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return 0;
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}
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static int activate(AVFilterContext *ctx)
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{
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AVFilterLink *outlink = ctx->outputs[0];
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FreezeFramesContext *s = ctx->priv;
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AVFrame *frame = NULL;
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int drop = ctx->inputs[0]->frame_count_out >= s->first &&
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ctx->inputs[0]->frame_count_out <= s->last;
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int replace = ctx->inputs[1]->frame_count_out == s->replace;
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int ret;
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FF_FILTER_FORWARD_STATUS_BACK_ALL(outlink, ctx);
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if (drop && s->replace_frame) {
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ret = ff_inlink_consume_frame(ctx->inputs[0], &frame);
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if (ret < 0)
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return ret;
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if (frame) {
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int64_t dropped_pts = frame->pts;
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av_frame_free(&frame);
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frame = av_frame_clone(s->replace_frame);
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if (!frame)
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return AVERROR(ENOMEM);
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frame->pts = dropped_pts;
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return ff_filter_frame(outlink, frame);
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}
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} else if (!drop) {
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ret = ff_inlink_consume_frame(ctx->inputs[0], &frame);
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if (ret < 0)
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return ret;
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if (frame)
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return ff_filter_frame(outlink, frame);
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}
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ret = ff_inlink_consume_frame(ctx->inputs[1], &frame);
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if (ret < 0)
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return ret;
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if (replace && frame) {
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s->replace_frame = frame;
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} else if (frame) {
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av_frame_free(&frame);
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}
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FF_FILTER_FORWARD_STATUS(ctx->inputs[0], outlink);
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FF_FILTER_FORWARD_STATUS(ctx->inputs[1], outlink);
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if (!drop || (drop && s->replace_frame))
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FF_FILTER_FORWARD_WANTED(outlink, ctx->inputs[0]);
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if (!s->replace_frame)
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FF_FILTER_FORWARD_WANTED(outlink, ctx->inputs[1]);
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return FFERROR_NOT_READY;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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FreezeFramesContext *s = ctx->priv;
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av_frame_free(&s->replace_frame);
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}
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static const AVFilterPad freezeframes_inputs[] = {
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{
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.name = "source",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{
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.name = "replace",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL },
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};
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static const AVFilterPad freezeframes_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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{ NULL },
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};
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2021-04-19 16:33:56 +00:00
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const AVFilter ff_vf_freezeframes = {
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2019-12-31 11:00:30 +00:00
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.name = "freezeframes",
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.description = NULL_IF_CONFIG_SMALL("Freeze video frames."),
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.priv_size = sizeof(FreezeFramesContext),
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.priv_class = &freezeframes_class,
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.inputs = freezeframes_inputs,
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.outputs = freezeframes_outputs,
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.activate = activate,
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.uninit = uninit,
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};
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