310 lines
9.2 KiB
C
310 lines
9.2 KiB
C
/*
|
|
* 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];
|
|
uint8_t *input[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;
|
|
}
|
|
|
|
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,
|
|
};
|