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Zoom & Pan filter 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-09-16 15:31:15 +00:00
parent 0accf24b15
commit 4b6cb1cc69
7 changed files with 403 additions and 1 deletions
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1
Changelog
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@ -27,6 +27,7 @@ version <next>:
- display matrix export and rotation api
- WebVTT encoder
- showcqt multimedia filter
- zoompan filter
version 2.2:

1
configure vendored
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@ -2540,6 +2540,7 @@ pixfmts_super2xsai_test_deps="super2xsai_filter"
tinterlace_merge_test_deps="tinterlace_filter"
tinterlace_pad_test_deps="tinterlace_filter"
zmq_filter_deps="libzmq"
zoompan_filter_deps="swscale"
# examples
avio_reading="avformat avcodec avutil"

88
doc/filters.texi
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@ -8680,6 +8680,94 @@ Only deinterlace frames marked as interlaced.
The default value is @code{all}.
@end table
@section zoompan
Apply Zoom & Pan effect.
This filter accepts the following options:
@table @option
@item zoom, z
Set the zoom expression. Default is 1.
@item x
@item y
Set the x and y expression. Default is 0.
@item d
Set the duration expression in number of frames.
This sets for how many number of frames effect will last for
single input image.
@item s
Set the output image size, default is 'hd720'.
@end table
Each expression can contain the following constants:
@table @option
@item in_w, iw
Input width.
@item in_h, ih
Input height.
@item out_w, ow
Output width.
@item out_h, oh
Output height.
@item in
Input frame count.
@item on
Output frame count.
@item x
@item y
Last calculated 'x' and 'y' position from 'x' and 'y' expression
for current input frame.
@item px
@item py
'x' and 'y' of last output frame of previous input frame or 0 when there was
not yet such frame (first input frame).
@item zoom
Last calculated zoom from 'z' expression for current input frame.
@item pzoom
Last calculated zoom of last output frame of previous input frame.
@item duration
Number of output frames for current input frame. Calculated from 'd' expression
for each input frame.
@item pduration
number of output frames created for previous input frame
@item a
Rational number: input width / input height
@item sar
sample aspect ratio
@item dar
display aspect ratio
@end table
@subsection Examples
@itemize
@item
Zoom-in up to 1.5 and pan at same time to some spot near center of picture:
@example
zoompan=z=min(zoom+0.0015\,1.5):d=700:x=if(gte(zoom\,1.5)\,x\,x+1/a):y=if(gte(zoom\,1.5)\,y\,y+1):s=640x360"
@end example
@end itemize
@c man end VIDEO FILTERS
@chapter Video Sources

1
libavfilter/Makefile
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@ -195,6 +195,7 @@ OBJS-$(CONFIG_VIGNETTE_FILTER) += vf_vignette.o
OBJS-$(CONFIG_W3FDIF_FILTER) += vf_w3fdif.o
OBJS-$(CONFIG_YADIF_FILTER) += vf_yadif.o
OBJS-$(CONFIG_ZMQ_FILTER) += f_zmq.o
OBJS-$(CONFIG_ZOOMPAN_FILTER) += vf_zoompan.o
OBJS-$(CONFIG_CELLAUTO_FILTER) += vsrc_cellauto.o
OBJS-$(CONFIG_COLOR_FILTER) += vsrc_testsrc.o

1
libavfilter/allfilters.c
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@ -212,6 +212,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(W3FDIF, w3fdif, vf);
REGISTER_FILTER(YADIF, yadif, vf);
REGISTER_FILTER(ZMQ, zmq, vf);
REGISTER_FILTER(ZOOMPAN, zoompan, vf);
REGISTER_FILTER(CELLAUTO, cellauto, vsrc);
REGISTER_FILTER(COLOR, color, vsrc);

2
libavfilter/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 4
#define LIBAVFILTER_VERSION_MINOR 6
#define LIBAVFILTER_VERSION_MINOR 7
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

310
libavfilter/vf_zoompan.c Normal file
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@ -0,0 +1,310 @@
/*
* Copyright (c) 2013 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/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "libswscale/swscale.h"
static const char *const var_names[] = {
"in_w", "iw",
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"in",
"on",
"duration",
"pduration",
"time",
"frame",
"zoom",
"pzoom",
"x", "px",
"y", "py",
"a",
"sar",
"dar",
"hsub",
"vsub",
NULL
};
enum var_name {
VAR_IN_W, VAR_IW,
VAR_IN_H, VAR_IH,
VAR_OUT_W, VAR_OW,
VAR_OUT_H, VAR_OH,
VAR_IN,
VAR_ON,
VAR_DURATION,
VAR_PDURATION,
VAR_TIME,
VAR_FRAME,
VAR_ZOOM,
VAR_PZOOM,
VAR_X, VAR_PX,
VAR_Y, VAR_PY,
VAR_A,
VAR_SAR,
VAR_DAR,
VAR_HSUB,
VAR_VSUB,
VARS_NB
};
typedef struct ZPcontext {
const AVClass *class;
char *zoom_expr_str;
char *x_expr_str;
char *y_expr_str;
char *duration_expr_str;
int w, h;
double x, y;
double prev_zoom;
int prev_nb_frames;
struct SwsContext *sws;
int64_t frame_count;
} ZPContext;
#define OFFSET(x) offsetof(ZPContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption zoompan_options[] = {
{ "zoom", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
{ "z", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
{ "x", "set the x expression", OFFSET(x_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
{ "y", "set the y expression", OFFSET(y_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
{ "d", "set the duration expression", OFFSET(duration_expr_str), AV_OPT_TYPE_STRING, {.str="90"}, .flags = FLAGS },
{ "s", "set the output image size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, .flags = FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(zoompan);
static av_cold int init(AVFilterContext *ctx)
{
ZPContext *s = ctx->priv;
s->prev_zoom = 1;
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ZPContext *s = ctx->priv;
outlink->w = s->w;
outlink->h = s->h;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
ZPContext *s = ctx->priv;
double var_values[VARS_NB], nb_frames, zoom, dx, dy;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(in->format);
AVFrame *out;
int i, k, x, y, w, h, ret = 0;
var_values[VAR_IN_W] = var_values[VAR_IW] = in->width;
var_values[VAR_IN_H] = var_values[VAR_IH] = in->height;
var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w;
var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h;
var_values[VAR_IN] = inlink->frame_count + 1;
var_values[VAR_ON] = outlink->frame_count + 1;
var_values[VAR_PX] = s->x;
var_values[VAR_PY] = s->y;
var_values[VAR_X] = 0;
var_values[VAR_Y] = 0;
var_values[VAR_PZOOM] = s->prev_zoom;
var_values[VAR_ZOOM] = 1;
var_values[VAR_PDURATION] = s->prev_nb_frames;
var_values[VAR_A] = (double) in->width / in->height;
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto fail;
var_values[VAR_DURATION] = nb_frames;
for (i = 0; i < nb_frames; i++) {
int px[4];
int py[4];
int64_t pts = av_rescale_q(in->pts, inlink->time_base,
outlink->time_base) + s->frame_count;
var_values[VAR_TIME] = pts * av_q2d(outlink->time_base);
var_values[VAR_FRAME] = i;
var_values[VAR_ON] = outlink->frame_count + 1;
if ((ret = av_expr_parse_and_eval(&zoom, s->zoom_expr_str,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto fail;
zoom = av_clipd(zoom, 1, 10);
var_values[VAR_ZOOM] = zoom;
w = in->width * (1.0 / zoom);
h = in->height * (1.0 / zoom);
if ((ret = av_expr_parse_and_eval(&dx, s->x_expr_str,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto fail;
x = dx = av_clipd(dx, 0, FFMAX(in->width - w, 0));
var_values[VAR_X] = dx;
x &= ~((1 << desc->log2_chroma_w) - 1);
if ((ret = av_expr_parse_and_eval(&dy, s->y_expr_str,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
goto fail;
y = dy = av_clipd(dy, 0, FFMAX(in->height - h, 0));
var_values[VAR_Y] = dy;
y &= ~((1 << desc->log2_chroma_h) - 1);
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
ret = AVERROR(ENOMEM);
goto fail;
}
px[1] = px[2] = FF_CEIL_RSHIFT(x, desc->log2_chroma_w);
px[0] = px[3] = x;
py[1] = py[2] = FF_CEIL_RSHIFT(y, desc->log2_chroma_h);
py[0] = py[3] = y;
s->sws = sws_alloc_context();
if (!s->sws) {
ret = AVERROR(ENOMEM);
goto fail;
}
uint8_t *input[4];
for (k = 0; in->data[k]; k++)
input[k] = in->data[k] + py[k] * in->linesize[k] + px[k];
av_opt_set_int(s->sws, "srcw", w, 0);
av_opt_set_int(s->sws, "srch", h, 0);
av_opt_set_int(s->sws, "src_format", in->format, 0);
av_opt_set_int(s->sws, "dstw", outlink->w, 0);
av_opt_set_int(s->sws, "dsth", outlink->h, 0);
av_opt_set_int(s->sws, "dst_format", outlink->format, 0);
av_opt_set_int(s->sws, "sws_flags", SWS_BICUBIC, 0);
if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0)
goto fail;
sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize);
out->pts = pts;
s->frame_count++;
ret = ff_filter_frame(outlink, out);
if (ret < 0)
break;
sws_freeContext(s->sws);
s->sws = NULL;
}
s->x = dx;
s->y = dy;
s->prev_zoom = zoom;
s->prev_nb_frames = nb_frames;
fail:
sws_freeContext(s->sws);
s->sws = NULL;
av_frame_free(&in);
return ret;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
ZPContext *s = ctx->priv;
sws_freeContext(s->sws);
s->sws = NULL;
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_vf_zoompan = {
.name = "zoompan",
.description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."),
.priv_size = sizeof(ZPContext),
.priv_class = &zoompan_class,
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = inputs,
.outputs = outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};