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FFmpeg/libavfilter/vf_swaprect.c
Nicolas George 183ce55b0d lavfi: split frame_count between input and output. 
AVFilterLink.frame_count is supposed to count the number of frames
that were passed on the link, but with min_samples, that number is
not always the same for the source and destination filters.
With the addition of a FIFO on the link, the difference will become
more significant.

Split the variable in two: frame_count_in counts the number of
frames that entered the link, frame_count_out counts the number
of frames that were sent to the destination filter.
2016-11-13 10:41:16 +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 "libavutil/pixdesc.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
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)
{
AVFilterFormats *pix_fmts = NULL;
int fmt, ret;
for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
if (!(desc->flags & AV_PIX_FMT_FLAG_PAL ||
desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
(ret = ff_add_format(&pix_fmts, fmt)) < 0)
return ret;
}
return ff_set_common_formats(ctx, pix_fmts);
}
static const char *const var_names[] = { "w", "h", "a", "n", "t", "pos", "sar", "dar", NULL };
enum { VAR_W, VAR_H, VAR_A, VAR_N, VAR_T, VAR_POS, 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);
var_values[VAR_POS] = av_frame_get_pkt_pos(in) == -1 ? NAN : av_frame_get_pkt_pos(in);
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] = FF_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
ah[0] = ah[3] = h;
aw[1] = aw[2] = FF_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] = FF_CEIL_RSHIFT(h, s->desc->log2_chroma_h);
ph[0] = ph[3] = h;
pw[1] = pw[2] = FF_CEIL_RSHIFT(w, s->desc->log2_chroma_w);
pw[0] = pw[3] = w;
lh[1] = lh[2] = FF_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
lh[0] = lh[3] = inlink->h;
lw[1] = lw[2] = FF_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
lw[0] = lw[3] = inlink->w;
x1[1] = x1[2] = FF_CEIL_RSHIFT(x1[0], s->desc->log2_chroma_w);
x1[0] = x1[3] = x1[0];
y1[1] = y1[2] = FF_CEIL_RSHIFT(y1[0], s->desc->log2_chroma_h);
y1[0] = y1[3] = y1[0];
x2[1] = x2[2] = FF_CEIL_RSHIFT(x2[0], s->desc->log2_chroma_w);
x2[0] = x2[3] = x2[0];
y2[1] = y2[2] = FF_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,
.filter_frame = filter_frame,
.config_props = config_input,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
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,
.query_formats = query_formats,
.uninit = uninit,
.inputs = inputs,
.outputs = outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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