143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/*
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* Copyright (c) 2015 Derek Buitenhuis
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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/opt.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#define DEFAULT_LENGTH 300
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typedef struct ReverseContext {
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int nb_frames;
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AVFrame **frames;
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unsigned int frames_size;
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unsigned int pts_size;
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int64_t *pts;
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int flush_idx;
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} ReverseContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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ReverseContext *s = ctx->priv;
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s->pts = av_fast_realloc(NULL, &s->pts_size,
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DEFAULT_LENGTH * sizeof(*(s->pts)));
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if (!s->pts)
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return AVERROR(ENOMEM);
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s->frames = av_fast_realloc(NULL, &s->frames_size,
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DEFAULT_LENGTH * sizeof(*(s->frames)));
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if (!s->frames) {
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av_freep(&s->pts);
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ReverseContext *s = ctx->priv;
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av_freep(&s->pts);
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av_freep(&s->frames);
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}
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static int config_output(AVFilterLink *outlink)
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{
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outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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ReverseContext *s = ctx->priv;
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if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
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void *ptr;
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ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
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if (!ptr)
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return AVERROR(ENOMEM);
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s->pts = ptr;
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ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
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if (!ptr)
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return AVERROR(ENOMEM);
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s->frames = ptr;
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}
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s->frames[s->nb_frames] = in;
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s->pts[s->nb_frames] = in->pts;
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s->nb_frames++;
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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ReverseContext *s = ctx->priv;
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int ret;
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ret = ff_request_frame(ctx->inputs[0]);
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if (ret == AVERROR_EOF && s->nb_frames > 0) {
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AVFrame *out = s->frames[s->nb_frames - 1];
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out->pts = s->pts[s->flush_idx++];
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ret = ff_filter_frame(outlink, out);
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s->nb_frames--;
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}
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return ret;
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}
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static const AVFilterPad reverse_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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},
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{ NULL }
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};
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static const AVFilterPad reverse_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame,
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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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AVFilter ff_vf_reverse = {
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.name = "reverse",
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.description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
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.priv_size = sizeof(ReverseContext),
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.init = init,
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.uninit = uninit,
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.inputs = reverse_inputs,
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.outputs = reverse_outputs,
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};
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