mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-27 20:01:50 +02:00
401 lines
14 KiB
C
401 lines
14 KiB
C
/*
|
|
* Copyright (c) 2008 vmrsss
|
|
* Copyright (c) 2009 Stefano Sabatini
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* video padding filter
|
|
*/
|
|
|
|
#include "avfilter.h"
|
|
#include "formats.h"
|
|
#include "internal.h"
|
|
#include "video.h"
|
|
#include "libavutil/avstring.h"
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/eval.h"
|
|
#include "libavutil/pixdesc.h"
|
|
#include "libavutil/colorspace.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/opt.h"
|
|
#include "libavutil/parseutils.h"
|
|
#include "libavutil/mathematics.h"
|
|
#include "drawutils.h"
|
|
|
|
static const char *const var_names[] = {
|
|
"in_w", "iw",
|
|
"in_h", "ih",
|
|
"out_w", "ow",
|
|
"out_h", "oh",
|
|
"x",
|
|
"y",
|
|
"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_X,
|
|
VAR_Y,
|
|
VAR_A,
|
|
VAR_SAR,
|
|
VAR_DAR,
|
|
VAR_HSUB,
|
|
VAR_VSUB,
|
|
VARS_NB
|
|
};
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
|
|
return 0;
|
|
}
|
|
|
|
typedef struct {
|
|
const AVClass *class;
|
|
int w, h; ///< output dimensions, a value of 0 will result in the input size
|
|
int x, y; ///< offsets of the input area with respect to the padded area
|
|
int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
|
|
|
|
char *w_expr; ///< width expression string
|
|
char *h_expr; ///< height expression string
|
|
char *x_expr; ///< width expression string
|
|
char *y_expr; ///< height expression string
|
|
char *color_str;
|
|
uint8_t rgba_color[4]; ///< color for the padding area
|
|
FFDrawContext draw;
|
|
FFDrawColor color;
|
|
} PadContext;
|
|
|
|
#define OFFSET(x) offsetof(PadContext, x)
|
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
|
|
|
|
static const AVOption pad_options[] = {
|
|
{ "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "color", "set the color of the padded area border", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str = "black"}, .flags = FLAGS },
|
|
{NULL}
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(pad);
|
|
|
|
static av_cold int init(AVFilterContext *ctx, const char *args)
|
|
{
|
|
PadContext *pad = ctx->priv;
|
|
static const char *shorthand[] = { "width", "height", "x", "y", "color", NULL };
|
|
int ret;
|
|
|
|
pad->class = &pad_class;
|
|
av_opt_set_defaults(pad);
|
|
|
|
if ((ret = av_opt_set_from_string(pad, args, shorthand, "=", ":")) < 0)
|
|
return ret;
|
|
|
|
if (av_parse_color(pad->rgba_color, pad->color_str, -1, ctx) < 0)
|
|
return AVERROR(EINVAL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
PadContext *pad = ctx->priv;
|
|
av_opt_free(pad);
|
|
}
|
|
|
|
static int config_input(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
PadContext *pad = ctx->priv;
|
|
int ret;
|
|
double var_values[VARS_NB], res;
|
|
char *expr;
|
|
|
|
ff_draw_init(&pad->draw, inlink->format, 0);
|
|
ff_draw_color(&pad->draw, &pad->color, pad->rgba_color);
|
|
|
|
var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
|
|
var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
|
|
var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
|
|
var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
|
|
var_values[VAR_A] = (double) inlink->w / inlink->h;
|
|
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 << pad->draw.hsub_max;
|
|
var_values[VAR_VSUB] = 1 << pad->draw.vsub_max;
|
|
|
|
/* evaluate width and height */
|
|
av_expr_parse_and_eval(&res, (expr = pad->w_expr),
|
|
var_names, var_values,
|
|
NULL, NULL, NULL, NULL, NULL, 0, ctx);
|
|
pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
|
|
if ((ret = av_expr_parse_and_eval(&res, (expr = pad->h_expr),
|
|
var_names, var_values,
|
|
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
|
|
goto eval_fail;
|
|
pad->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
|
|
/* evaluate the width again, as it may depend on the evaluated output height */
|
|
if ((ret = av_expr_parse_and_eval(&res, (expr = pad->w_expr),
|
|
var_names, var_values,
|
|
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
|
|
goto eval_fail;
|
|
pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
|
|
|
|
/* evaluate x and y */
|
|
av_expr_parse_and_eval(&res, (expr = pad->x_expr),
|
|
var_names, var_values,
|
|
NULL, NULL, NULL, NULL, NULL, 0, ctx);
|
|
pad->x = var_values[VAR_X] = res;
|
|
if ((ret = av_expr_parse_and_eval(&res, (expr = pad->y_expr),
|
|
var_names, var_values,
|
|
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
|
|
goto eval_fail;
|
|
pad->y = var_values[VAR_Y] = res;
|
|
/* evaluate x again, as it may depend on the evaluated y value */
|
|
if ((ret = av_expr_parse_and_eval(&res, (expr = pad->x_expr),
|
|
var_names, var_values,
|
|
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
|
|
goto eval_fail;
|
|
pad->x = var_values[VAR_X] = res;
|
|
|
|
/* sanity check params */
|
|
if (pad->w < 0 || pad->h < 0 || pad->x < 0 || pad->y < 0) {
|
|
av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (!pad->w)
|
|
pad->w = inlink->w;
|
|
if (!pad->h)
|
|
pad->h = inlink->h;
|
|
|
|
pad->w = ff_draw_round_to_sub(&pad->draw, 0, -1, pad->w);
|
|
pad->h = ff_draw_round_to_sub(&pad->draw, 1, -1, pad->h);
|
|
pad->x = ff_draw_round_to_sub(&pad->draw, 0, -1, pad->x);
|
|
pad->y = ff_draw_round_to_sub(&pad->draw, 1, -1, pad->y);
|
|
pad->in_w = ff_draw_round_to_sub(&pad->draw, 0, -1, inlink->w);
|
|
pad->in_h = ff_draw_round_to_sub(&pad->draw, 1, -1, inlink->h);
|
|
|
|
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X\n",
|
|
inlink->w, inlink->h, pad->w, pad->h, pad->x, pad->y,
|
|
pad->rgba_color[0], pad->rgba_color[1], pad->rgba_color[2], pad->rgba_color[3]);
|
|
|
|
if (pad->x < 0 || pad->y < 0 ||
|
|
pad->w <= 0 || pad->h <= 0 ||
|
|
(unsigned)pad->x + (unsigned)inlink->w > pad->w ||
|
|
(unsigned)pad->y + (unsigned)inlink->h > pad->h) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
|
|
pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
return 0;
|
|
|
|
eval_fail:
|
|
av_log(NULL, AV_LOG_ERROR,
|
|
"Error when evaluating the expression '%s'\n", expr);
|
|
return ret;
|
|
|
|
}
|
|
|
|
static int config_output(AVFilterLink *outlink)
|
|
{
|
|
PadContext *pad = outlink->src->priv;
|
|
|
|
outlink->w = pad->w;
|
|
outlink->h = pad->h;
|
|
return 0;
|
|
}
|
|
|
|
static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
|
|
{
|
|
PadContext *pad = inlink->dst->priv;
|
|
int align = (perms&AV_PERM_ALIGN) ? AVFILTER_ALIGN : 1;
|
|
|
|
AVFilterBufferRef *picref = ff_get_video_buffer(inlink->dst->outputs[0], perms,
|
|
w + (pad->w - pad->in_w) + 4*align,
|
|
h + (pad->h - pad->in_h));
|
|
int plane;
|
|
|
|
if (!picref)
|
|
return NULL;
|
|
|
|
picref->video->w = w;
|
|
picref->video->h = h;
|
|
|
|
for (plane = 0; plane < 4 && picref->data[plane]; plane++)
|
|
picref->data[plane] += FFALIGN(pad->x >> pad->draw.hsub[plane], align) * pad->draw.pixelstep[plane] +
|
|
(pad->y >> pad->draw.vsub[plane]) * picref->linesize[plane];
|
|
|
|
return picref;
|
|
}
|
|
|
|
static int does_clip(PadContext *pad, AVFilterBufferRef *outpicref, int plane, int hsub, int vsub, int x, int y)
|
|
{
|
|
int64_t x_in_buf, y_in_buf;
|
|
|
|
x_in_buf = outpicref->data[plane] - outpicref->buf->data[plane]
|
|
+ (x >> hsub) * pad->draw.pixelstep[plane]
|
|
+ (y >> vsub) * outpicref->linesize[plane];
|
|
|
|
if(x_in_buf < 0 || x_in_buf % pad->draw.pixelstep[plane])
|
|
return 1;
|
|
x_in_buf /= pad->draw.pixelstep[plane];
|
|
|
|
av_assert0(outpicref->buf->linesize[plane]>0); //while reference can use negative linesize the main buffer should not
|
|
|
|
y_in_buf = x_in_buf / outpicref->buf->linesize[plane];
|
|
x_in_buf %= outpicref->buf->linesize[plane];
|
|
|
|
if( y_in_buf<<vsub >= outpicref->buf->h
|
|
|| x_in_buf<<hsub >= outpicref->buf->w)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
|
|
{
|
|
PadContext *pad = inlink->dst->priv;
|
|
AVFilterBufferRef *out = avfilter_ref_buffer(in, ~0);
|
|
int plane, needs_copy;
|
|
|
|
if (!out) {
|
|
avfilter_unref_bufferp(&in);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
for (plane = 0; plane < 4 && out->data[plane] && pad->draw.pixelstep[plane]; plane++) {
|
|
int hsub = pad->draw.hsub[plane];
|
|
int vsub = pad->draw.vsub[plane];
|
|
|
|
av_assert0(out->buf->w > 0 && out->buf->h > 0);
|
|
|
|
if (out->format != out->buf->format) //unsupported currently
|
|
break;
|
|
|
|
out->data[plane] -= (pad->x >> hsub) * pad->draw.pixelstep[plane] +
|
|
(pad->y >> vsub) * out->linesize[plane];
|
|
|
|
if (does_clip(pad, out, plane, hsub, vsub, 0, 0) ||
|
|
does_clip(pad, out, plane, hsub, vsub, 0, pad->h - 1) ||
|
|
does_clip(pad, out, plane, hsub, vsub, pad->w - 1, 0) ||
|
|
does_clip(pad, out, plane, hsub, vsub, pad->w - 1, pad->h - 1))
|
|
break;
|
|
}
|
|
needs_copy = plane < 4 && out->data[plane] || !(out->perms & AV_PERM_WRITE);
|
|
if (needs_copy) {
|
|
av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
|
|
avfilter_unref_buffer(out);
|
|
out = ff_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES,
|
|
FFMAX(inlink->w, pad->w),
|
|
FFMAX(inlink->h, pad->h));
|
|
if (!out) {
|
|
avfilter_unref_bufferp(&in);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
avfilter_copy_buffer_ref_props(out, in);
|
|
}
|
|
|
|
out->video->w = pad->w;
|
|
out->video->h = pad->h;
|
|
|
|
/* top bar */
|
|
if (pad->y) {
|
|
ff_fill_rectangle(&pad->draw, &pad->color,
|
|
out->data, out->linesize,
|
|
0, 0, pad->w, pad->y);
|
|
}
|
|
|
|
/* bottom bar */
|
|
if (pad->h > pad->y + pad->in_h) {
|
|
ff_fill_rectangle(&pad->draw, &pad->color,
|
|
out->data, out->linesize,
|
|
0, pad->y + pad->in_h, pad->w, pad->h - pad->y - pad->in_h);
|
|
}
|
|
|
|
/* left border */
|
|
ff_fill_rectangle(&pad->draw, &pad->color, out->data, out->linesize,
|
|
0, pad->y, pad->x, in->video->h);
|
|
|
|
if (needs_copy) {
|
|
ff_copy_rectangle2(&pad->draw,
|
|
out->data, out->linesize, in->data, in->linesize,
|
|
pad->x, pad->y, 0, 0, in->video->w, in->video->h);
|
|
}
|
|
|
|
/* right border */
|
|
ff_fill_rectangle(&pad->draw, &pad->color, out->data, out->linesize,
|
|
pad->x + pad->in_w, pad->y, pad->w - pad->x - pad->in_w,
|
|
in->video->h);
|
|
|
|
avfilter_unref_bufferp(&in);
|
|
return ff_filter_frame(inlink->dst->outputs[0], out);
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_pad_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input,
|
|
.get_video_buffer = get_video_buffer,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_pad_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_vf_pad = {
|
|
.name = "pad",
|
|
.description = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
|
|
|
|
.priv_size = sizeof(PadContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
|
|
.inputs = avfilter_vf_pad_inputs,
|
|
|
|
.outputs = avfilter_vf_pad_outputs,
|
|
.priv_class = &pad_class,
|
|
};
|