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/* |
* 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/parseutils.h" |
#include "libavutil/mathematics.h" |
#include "libavutil/opt.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 |
uint8_t rgba_color[4]; ///< color for the padding area |
FFDrawContext draw; |
FFDrawColor color; |
} PadContext; |
|
static int config_input(AVFilterLink *inlink) |
{ |
AVFilterContext *ctx = inlink->dst; |
PadContext *s = ctx->priv; |
int ret; |
double var_values[VARS_NB], res; |
char *expr; |
|
ff_draw_init(&s->draw, inlink->format, 0); |
ff_draw_color(&s->draw, &s->color, s->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 << s->draw.hsub_max; |
var_values[VAR_VSUB] = 1 << s->draw.vsub_max; |
|
/* evaluate width and height */ |
av_expr_parse_and_eval(&res, (expr = s->w_expr), |
var_names, var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx); |
s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; |
if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr), |
var_names, var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
goto eval_fail; |
s->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 = s->w_expr), |
var_names, var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
goto eval_fail; |
s->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; |
|
/* evaluate x and y */ |
av_expr_parse_and_eval(&res, (expr = s->x_expr), |
var_names, var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx); |
s->x = var_values[VAR_X] = res; |
if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr), |
var_names, var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
goto eval_fail; |
s->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 = s->x_expr), |
var_names, var_values, |
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
goto eval_fail; |
s->x = var_values[VAR_X] = res; |
|
/* sanity check params */ |
if (s->w < 0 || s->h < 0 || s->x < 0 || s->y < 0) { |
av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n"); |
return AVERROR(EINVAL); |
} |
|
if (!s->w) |
s->w = inlink->w; |
if (!s->h) |
s->h = inlink->h; |
|
s->w = ff_draw_round_to_sub(&s->draw, 0, -1, s->w); |
s->h = ff_draw_round_to_sub(&s->draw, 1, -1, s->h); |
s->x = ff_draw_round_to_sub(&s->draw, 0, -1, s->x); |
s->y = ff_draw_round_to_sub(&s->draw, 1, -1, s->y); |
s->in_w = ff_draw_round_to_sub(&s->draw, 0, -1, inlink->w); |
s->in_h = ff_draw_round_to_sub(&s->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, s->w, s->h, s->x, s->y, |
s->rgba_color[0], s->rgba_color[1], s->rgba_color[2], s->rgba_color[3]); |
|
if (s->x < 0 || s->y < 0 || |
s->w <= 0 || s->h <= 0 || |
(unsigned)s->x + (unsigned)inlink->w > s->w || |
(unsigned)s->y + (unsigned)inlink->h > s->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", |
s->x, s->y, s->x + inlink->w, s->y + inlink->h, s->w, s->h); |
return AVERROR(EINVAL); |
} |
|
return 0; |
|
eval_fail: |
av_log(NULL, AV_LOG_ERROR, |
"Error when evaluating the expression '%s'\n", expr); |
return ret; |
|
} |
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static int config_output(AVFilterLink *outlink) |
{ |
PadContext *s = outlink->src->priv; |
|
outlink->w = s->w; |
outlink->h = s->h; |
return 0; |
} |
|
static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h) |
{ |
PadContext *s = inlink->dst->priv; |
|
AVFrame *frame = ff_get_video_buffer(inlink->dst->outputs[0], |
w + (s->w - s->in_w), |
h + (s->h - s->in_h)); |
int plane; |
|
if (!frame) |
return NULL; |
|
frame->width = w; |
frame->height = h; |
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for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) { |
int hsub = s->draw.hsub[plane]; |
int vsub = s->draw.vsub[plane]; |
frame->data[plane] += (s->x >> hsub) * s->draw.pixelstep[plane] + |
(s->y >> vsub) * frame->linesize[plane]; |
} |
|
return frame; |
} |
|
/* check whether each plane in this buffer can be padded without copying */ |
static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf) |
{ |
int planes[4] = { -1, -1, -1, -1}, *p = planes; |
int i, j; |
|
/* get all planes in this buffer */ |
for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) { |
if (av_frame_get_plane_buffer(frame, i) == buf) |
*p++ = i; |
} |
|
/* for each plane in this buffer, check that it can be padded without |
* going over buffer bounds or other planes */ |
for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) { |
int hsub = s->draw.hsub[planes[i]]; |
int vsub = s->draw.vsub[planes[i]]; |
|
uint8_t *start = frame->data[planes[i]]; |
uint8_t *end = start + (frame->height >> vsub) * |
frame->linesize[planes[i]]; |
|
/* amount of free space needed before the start and after the end |
* of the plane */ |
ptrdiff_t req_start = (s->x >> hsub) * s->draw.pixelstep[planes[i]] + |
(s->y >> vsub) * frame->linesize[planes[i]]; |
ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) * |
s->draw.pixelstep[planes[i]] + |
(s->y >> vsub) * frame->linesize[planes[i]]; |
|
if (frame->linesize[planes[i]] < (s->w >> hsub) * s->draw.pixelstep[planes[i]]) |
return 1; |
if (start - buf->data < req_start || |
(buf->data + buf->size) - end < req_end) |
return 1; |
|
for (j = 0; j < FF_ARRAY_ELEMS(planes) && planes[j] >= 0; j++) { |
int vsub1 = s->draw.vsub[planes[j]]; |
uint8_t *start1 = frame->data[planes[j]]; |
uint8_t *end1 = start1 + (frame->height >> vsub1) * |
frame->linesize[planes[j]]; |
if (i == j) |
continue; |
|
if (FFSIGN(start - end1) != FFSIGN(start - end1 - req_start) || |
FFSIGN(end - start1) != FFSIGN(end - start1 + req_end)) |
return 1; |
} |
} |
|
return 0; |
} |
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static int frame_needs_copy(PadContext *s, AVFrame *frame) |
{ |
int i; |
|
if (!av_frame_is_writable(frame)) |
return 1; |
|
for (i = 0; i < 4 && frame->buf[i]; i++) |
if (buffer_needs_copy(s, frame, frame->buf[i])) |
return 1; |
return 0; |
} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
{ |
PadContext *s = inlink->dst->priv; |
AVFrame *out; |
int needs_copy = frame_needs_copy(s, in); |
|
if (needs_copy) { |
av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n"); |
out = ff_get_video_buffer(inlink->dst->outputs[0], |
FFMAX(inlink->w, s->w), |
FFMAX(inlink->h, s->h)); |
if (!out) { |
av_frame_free(&in); |
return AVERROR(ENOMEM); |
} |
|
av_frame_copy_props(out, in); |
} else { |
int i; |
|
out = in; |
for (i = 0; i < 4 && out->data[i] && out->linesize[i]; i++) { |
int hsub = s->draw.hsub[i]; |
int vsub = s->draw.vsub[i]; |
out->data[i] -= (s->x >> hsub) * s->draw.pixelstep[i] + |
(s->y >> vsub) * out->linesize[i]; |
} |
} |
|
/* top bar */ |
if (s->y) { |
ff_fill_rectangle(&s->draw, &s->color, |
out->data, out->linesize, |
0, 0, s->w, s->y); |
} |
|
/* bottom bar */ |
if (s->h > s->y + s->in_h) { |
ff_fill_rectangle(&s->draw, &s->color, |
out->data, out->linesize, |
0, s->y + s->in_h, s->w, s->h - s->y - s->in_h); |
} |
|
/* left border */ |
ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize, |
0, s->y, s->x, in->height); |
|
if (needs_copy) { |
ff_copy_rectangle2(&s->draw, |
out->data, out->linesize, in->data, in->linesize, |
s->x, s->y, 0, 0, in->width, in->height); |
} |
|
/* right border */ |
ff_fill_rectangle(&s->draw, &s->color, out->data, out->linesize, |
s->x + s->in_w, s->y, s->w - s->x - s->in_w, |
in->height); |
|
out->width = s->w; |
out->height = s->h; |
|
if (in != out) |
av_frame_free(&in); |
return ff_filter_frame(inlink->dst->outputs[0], out); |
} |
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#define OFFSET(x) offsetof(PadContext, x) |
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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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(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS }, |
{ NULL } |
}; |
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AVFILTER_DEFINE_CLASS(pad); |
|
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 the input video."), |
.priv_size = sizeof(PadContext), |
.priv_class = &pad_class, |
.query_formats = query_formats, |
.inputs = avfilter_vf_pad_inputs, |
.outputs = avfilter_vf_pad_outputs, |
}; |