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