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/*
* Copyright (c) 2015 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 "internal.h"
#include "video.h"
typedef struct ShuffleFramesContext {
const AVClass *class;
char *mapping;
AVFrame **frames;
int *map;
int64_t *pts;
int in_frames;
int nb_frames;
} ShuffleFramesContext;
static av_cold int init(AVFilterContext *ctx)
{
ShuffleFramesContext *s = ctx->priv;
char *mapping, *saveptr = NULL, *p;
int n, nb_items;
nb_items = 1;
for (p = s->mapping; *p; p++) {
if (*p == '|' || *p == ' ')
nb_items++;
}
s->frames = av_calloc(nb_items, sizeof(*s->frames));
s->map = av_calloc(nb_items, sizeof(*s->map));
s->pts = av_calloc(nb_items, sizeof(*s->pts));
if (!s->map || !s->frames || !s->pts) {
return AVERROR(ENOMEM);
}
mapping = av_strdup(s->mapping);
if (!mapping)
return AVERROR(ENOMEM);
for (n = 0; n < nb_items; n++) {
char *map = av_strtok(n == 0 ? mapping : NULL, " |", &saveptr);
if (!map || sscanf(map, "%d", &s->map[n]) != 1) {
av_free(mapping);
return AVERROR(EINVAL);
}
if (s->map[n] < -1 || s->map[n] >= nb_items) {
av_log(ctx, AV_LOG_ERROR, "Index %d out of range: [-1, %d].\n", s->map[n], nb_items - 1);
av_free(mapping);
return AVERROR(EINVAL);
}
}
s->nb_frames = nb_items;
av_free(mapping);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
ShuffleFramesContext *s = ctx->priv;
int ret = 0;
if (s->in_frames < s->nb_frames) {
s->frames[s->in_frames] = frame;
s->pts[s->in_frames] = frame->pts;
s->in_frames++;
}
if (s->in_frames == s->nb_frames) {
int n, x;
for (n = 0; n < s->nb_frames; n++) {
AVFrame *out;
x = s->map[n];
if (x >= 0) {
out = av_frame_clone(s->frames[x]);
if (!out)
return AVERROR(ENOMEM);
out->pts = s->pts[n];
ret = ff_filter_frame(ctx->outputs[0], out);
}
s->in_frames--;
}
for (n = 0; n < s->nb_frames; n++)
av_frame_free(&s->frames[n]);
}
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
ShuffleFramesContext *s = ctx->priv;
while (s->in_frames > 0) {
s->in_frames--;
av_frame_free(&s->frames[s->in_frames]);
}
av_freep(&s->frames);
av_freep(&s->map);
av_freep(&s->pts);
}
#define OFFSET(x) offsetof(ShuffleFramesContext, x)
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
static const AVOption shuffleframes_options[] = {
{ "mapping", "set destination indexes of input frames", OFFSET(mapping), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
{ NULL },
};
AVFILTER_DEFINE_CLASS(shuffleframes);
static const AVFilterPad shuffleframes_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL },
};
static const AVFilterPad shuffleframes_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL },
};
const AVFilter ff_vf_shuffleframes = {
.name = "shuffleframes",
.description = NULL_IF_CONFIG_SMALL("Shuffle video frames."),
.priv_size = sizeof(ShuffleFramesContext),
.priv_class = &shuffleframes_class,
.init = init,
.uninit = uninit,
.inputs = shuffleframes_inputs,
.outputs = shuffleframes_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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