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FFmpeg/libavfilter/vf_swaprect.c
Anton Khirnov 27f8c9b27b lavu/frame: deprecate AVFrame.pkt_{pos,size} 
These fields are supposed to store information about the packet the
frame was decoded from, specifically the byte offset it was stored at
and its size.

However,
- the fields are highly ad-hoc - there is no strong reason why
  specifically those (and not any other) packet properties should have a
  dedicated field in AVFrame; unlike e.g. the timestamps, there is no
  fundamental link between coded packet offset/size and decoded frames
- they only make sense for frames produced by decoding demuxed packets,
  and even then it is not always the case that the encoded data was
  stored in the file as a contiguous sequence of bytes (in order for pos
  to be well-defined)
- pkt_pos was added without much explanation, apparently to allow
  passthrough of this information through lavfi in order to handle byte
  seeking in ffplay. That is now implemented using arbitrary user data
  passthrough in AVFrame.opaque_ref.
- several filters use pkt_pos as a variable available to user-supplied
  expressions, but there seems to be no established motivation for using them.
- pkt_size was added for use in ffprobe, but that too is now handled
  without using this field. Additonally, the values of this field
  produced by libavcodec are flawed, as described in the previous
  ffprobe conversion commit.

In summary - these fields are ill-defined and insufficiently motivated,
so deprecate them.
2023-03-20 10:42:09 +01:00

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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/eval.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct SwapRectContext {
const AVClass *class;
char *w, *h;
char *x1, *y1;
char *x2, *y2;
int nb_planes;
int pixsteps[4];
const AVPixFmtDescriptor *desc;
uint8_t *temp;
} SwapRectContext;
#define OFFSET(x) offsetof(SwapRectContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption swaprect_options[] = {
{ "w", "set rect width", OFFSET(w), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
{ "h", "set rect height", OFFSET(h), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
{ "x1", "set 1st rect x top left coordinate", OFFSET(x1), AV_OPT_TYPE_STRING, {.str="w/2"}, 0, 0, .flags = FLAGS },
{ "y1", "set 1st rect y top left coordinate", OFFSET(y1), AV_OPT_TYPE_STRING, {.str="h/2"}, 0, 0, .flags = FLAGS },
{ "x2", "set 2nd rect x top left coordinate", OFFSET(x2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
{ "y2", "set 2nd rect y top left coordinate", OFFSET(y2), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags = FLAGS },
{ NULL },
};
AVFILTER_DEFINE_CLASS(swaprect);
static int query_formats(AVFilterContext *ctx)
{
int reject_flags = AV_PIX_FMT_FLAG_PAL |
AV_PIX_FMT_FLAG_HWACCEL |
AV_PIX_FMT_FLAG_BITSTREAM;
return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
}
static const char *const var_names[] = { "w", "h", "a", "n", "t",
#if FF_API_FRAME_PKT
"pos",
#endif
"sar", "dar", NULL };
enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T,
#if FF_API_FRAME_PKT
VAR_POS,
#endif
VAR_SAR, VAR_DAR, VAR_VARS_NB };
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
SwapRectContext *s = ctx->priv;
double var_values[VAR_VARS_NB];
int x1[4], y1[4];
int x2[4], y2[4];
int aw[4], ah[4];
int lw[4], lh[4];
int pw[4], ph[4];
double dw, dh;
double dx1, dy1;
double dx2, dy2;
int y, p, w, h, ret;
var_values[VAR_W] = inlink->w;
var_values[VAR_H] = inlink->h;
var_values[VAR_A] = (float) inlink->w / inlink->h;
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
var_values[VAR_N] = inlink->frame_count_out;
var_values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base);
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
ret = av_expr_parse_and_eval(&dw, s->w,
var_names, &var_values[0],
NULL, NULL, NULL, NULL,
0, 0, ctx);
if (ret < 0)
return ret;
ret = av_expr_parse_and_eval(&dh, s->h,
var_names, &var_values[0],
NULL, NULL, NULL, NULL,
0, 0, ctx);
if (ret < 0)
return ret;
ret = av_expr_parse_and_eval(&dx1, s->x1,
var_names, &var_values[0],
NULL, NULL, NULL, NULL,
0, 0, ctx);
if (ret < 0)
return ret;
ret = av_expr_parse_and_eval(&dy1, s->y1,
var_names, &var_values[0],
NULL, NULL, NULL, NULL,
0, 0, ctx);
if (ret < 0)
return ret;
ret = av_expr_parse_and_eval(&dx2, s->x2,
var_names, &var_values[0],
NULL, NULL, NULL, NULL,
0, 0, ctx);
if (ret < 0)
return ret;
ret = av_expr_parse_and_eval(&dy2, s->y2,
var_names, &var_values[0],
NULL, NULL, NULL, NULL,
0, 0, ctx);
if (ret < 0)
return ret;
w = dw; h = dh; x1[0] = dx1; y1[0] = dy1; x2[0] = dx2; y2[0] = dy2;
x1[0] = av_clip(x1[0], 0, inlink->w - 1);
y1[0] = av_clip(y1[0], 0, inlink->w - 1);
x2[0] = av_clip(x2[0], 0, inlink->w - 1);
y2[0] = av_clip(y2[0], 0, inlink->w - 1);
ah[1] = ah[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
ah[0] = ah[3] = h;
aw[1] = aw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
aw[0] = aw[3] = w;
w = FFMIN3(w, inlink->w - x1[0], inlink->w - x2[0]);
h = FFMIN3(h, inlink->h - y1[0], inlink->h - y2[0]);
ph[1] = ph[2] = AV_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
ph[0] = ph[3] = h;
pw[1] = pw[2] = AV_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
pw[0] = pw[3] = w;
lh[1] = lh[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
lh[0] = lh[3] = inlink->h;
lw[1] = lw[2] = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
lw[0] = lw[3] = inlink->w;
x1[1] = x1[2] = AV_CEIL_RSHIFT(x1[0], s->desc->log2_chroma_w);
x1[0] = x1[3] = x1[0];
y1[1] = y1[2] = AV_CEIL_RSHIFT(y1[0], s->desc->log2_chroma_h);
y1[0] = y1[3] = y1[0];
x2[1] = x2[2] = AV_CEIL_RSHIFT(x2[0], s->desc->log2_chroma_w);
x2[0] = x2[3] = x2[0];
y2[1] = y2[2] = AV_CEIL_RSHIFT(y2[0], s->desc->log2_chroma_h);
y2[0] = y2[3] = y2[0];
for (p = 0; p < s->nb_planes; p++) {
if (ph[p] == ah[p] && pw[p] == aw[p]) {
uint8_t *src = in->data[p] + y1[p] * in->linesize[p] + x1[p] * s->pixsteps[p];
uint8_t *dst = in->data[p] + y2[p] * in->linesize[p] + x2[p] * s->pixsteps[p];
for (y = 0; y < ph[p]; y++) {
memcpy(s->temp, src, pw[p] * s->pixsteps[p]);
memmove(src, dst, pw[p] * s->pixsteps[p]);
memcpy(dst, s->temp, pw[p] * s->pixsteps[p]);
src += in->linesize[p];
dst += in->linesize[p];
}
}
}
return ff_filter_frame(outlink, in);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
SwapRectContext *s = ctx->priv;
if (!s->w || !s->h ||
!s->x1 || !s->y1 ||
!s->x2 || !s->y2)
return AVERROR(EINVAL);
s->desc = av_pix_fmt_desc_get(inlink->format);
av_image_fill_max_pixsteps(s->pixsteps, NULL, s->desc);
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
s->temp = av_malloc_array(inlink->w, s->pixsteps[0]);
if (!s->temp)
return AVERROR(ENOMEM);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SwapRectContext *s = ctx->priv;
av_freep(&s->temp);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_swaprect = {
.name = "swaprect",
.description = NULL_IF_CONFIG_SMALL("Swap 2 rectangular objects in video."),
.priv_size = sizeof(SwapRectContext),
.priv_class = &swaprect_class,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
.process_command = ff_filter_process_command,
};
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