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FFmpeg/libavfilter/vf_pad.c
Stefano Sabatini 61d55fda2b lavfi: tweak display aspect ratio variables in pad and scale filters 
Previously, "dar" and "a" were documented like "input display aspect
ratio", but their actual value was "in_w/in_h".

In order to avoid to break scripts which rely on the "a" variable, the
patch keeps the same semantics but fixes the corresponding docs, and
fixes the semantics of the recently added "dar" variable, which
now correctly expresses the input Display Aspect Ratio value as
"(inw_w/in_h)*sar".
2011-07-30 18:27:24 +02:00

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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 "libavutil/avstring.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 "drawutils.h"
static const char *var_names[] = {
"PI",
"PHI",
"E",
"in_w", "iw",
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"x",
"y",
"a",
"sar",
"dar",
"hsub",
"vsub",
NULL
};
enum var_name {
VAR_PI,
VAR_PHI,
VAR_E,
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)
{
static const enum PixelFormat pix_fmts[] = {
PIX_FMT_ARGB, PIX_FMT_RGBA,
PIX_FMT_ABGR, PIX_FMT_BGRA,
PIX_FMT_RGB24, PIX_FMT_BGR24,
PIX_FMT_YUV444P, PIX_FMT_YUV422P,
PIX_FMT_YUV420P, PIX_FMT_YUV411P,
PIX_FMT_YUV410P, PIX_FMT_YUV440P,
PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
PIX_FMT_YUVA420P,
PIX_FMT_NONE
};
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
typedef struct {
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[256]; ///< width expression string
char h_expr[256]; ///< height expression string
char x_expr[256]; ///< width expression string
char y_expr[256]; ///< height expression string
uint8_t color[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
uint8_t *line[4];
int line_step[4];
int hsub, vsub; ///< chroma subsampling values
int needs_copy;
} PadContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
PadContext *pad = ctx->priv;
char color_string[128] = "black";
av_strlcpy(pad->w_expr, "iw", sizeof(pad->w_expr));
av_strlcpy(pad->h_expr, "ih", sizeof(pad->h_expr));
av_strlcpy(pad->x_expr, "0" , sizeof(pad->w_expr));
av_strlcpy(pad->y_expr, "0" , sizeof(pad->h_expr));
if (args)
sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255s",
pad->w_expr, pad->h_expr, pad->x_expr, pad->y_expr, color_string);
if (av_parse_color(pad->color, color_string, -1, ctx) < 0)
return AVERROR(EINVAL);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
PadContext *pad = ctx->priv;
int i;
for (i = 0; i < 4; i++) {
av_freep(&pad->line[i]);
pad->line_step[i] = 0;
}
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
PadContext *pad = ctx->priv;
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
uint8_t rgba_color[4];
int ret, is_packed_rgba;
double var_values[VARS_NB], res;
char *expr;
pad->hsub = pix_desc->log2_chroma_w;
pad->vsub = pix_desc->log2_chroma_h;
var_values[VAR_PI] = M_PI;
var_values[VAR_PHI] = M_PHI;
var_values[VAR_E] = M_E;
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] = (float) inlink->w / inlink->h;
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
(float) 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->hsub;
var_values[VAR_VSUB] = 1<<pad->vsub;
/* 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 &= ~((1 << pad->hsub) - 1);
pad->h &= ~((1 << pad->vsub) - 1);
pad->x &= ~((1 << pad->hsub) - 1);
pad->y &= ~((1 << pad->vsub) - 1);
pad->in_w = inlink->w & ~((1 << pad->hsub) - 1);
pad->in_h = inlink->h & ~((1 << pad->vsub) - 1);
memcpy(rgba_color, pad->color, sizeof(rgba_color));
ff_fill_line_with_color(pad->line, pad->line_step, pad->w, pad->color,
inlink->format, rgba_color, &is_packed_rgba, NULL);
av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X[%s]\n",
inlink->w, inlink->h, pad->w, pad->h, pad->x, pad->y,
pad->color[0], pad->color[1], pad->color[2], pad->color[3],
is_packed_rgba ? "rgba" : "yuva");
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;
AVFilterBufferRef *picref = avfilter_get_video_buffer(inlink->dst->outputs[0], perms,
w + (pad->w - pad->in_w),
h + (pad->h - pad->in_h));
int plane;
picref->video->w = w;
picref->video->h = h;
for (plane = 0; plane < 4 && picref->data[plane]; plane++) {
int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
(pad->y >> vsub) * 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 ->line_step[plane]
+ (y >> vsub) * outpicref->linesize [plane];
if(x_in_buf < 0 || x_in_buf % pad->line_step[plane])
return 1;
x_in_buf /= pad->line_step[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 void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
{
PadContext *pad = inlink->dst->priv;
AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
int plane;
for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
av_assert0(outpicref->buf->w>0 && outpicref->buf->h>0);
if(outpicref->format != outpicref->buf->format) //unsupported currently
break;
outpicref->data[plane] -= (pad->x >> hsub) * pad ->line_step[plane]
+ (pad->y >> vsub) * outpicref->linesize [plane];
if( does_clip(pad, outpicref, plane, hsub, vsub, 0, 0)
|| does_clip(pad, outpicref, plane, hsub, vsub, 0, pad->h-1)
|| does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, 0)
|| does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, pad->h-1)
)
break;
}
pad->needs_copy= plane < 4 && outpicref->data[plane];
if(pad->needs_copy){
av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
avfilter_unref_buffer(outpicref);
outpicref = avfilter_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES,
FFMAX(inlink->w, pad->w),
FFMAX(inlink->h, pad->h));
avfilter_copy_buffer_ref_props(outpicref, inpicref);
}
inlink->dst->outputs[0]->out_buf = outpicref;
outpicref->video->w = pad->w;
outpicref->video->h = pad->h;
avfilter_start_frame(inlink->dst->outputs[0], outpicref);
}
static void end_frame(AVFilterLink *link)
{
avfilter_end_frame(link->dst->outputs[0]);
avfilter_unref_buffer(link->cur_buf);
}
static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
{
PadContext *pad = link->dst->priv;
int bar_y, bar_h = 0;
if (slice_dir * before_slice == 1 && y == pad->y) {
/* top bar */
bar_y = 0;
bar_h = pad->y;
} else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
/* bottom bar */
bar_y = pad->y + pad->in_h;
bar_h = pad->h - pad->in_h - pad->y;
}
if (bar_h) {
ff_draw_rectangle(link->dst->outputs[0]->out_buf->data,
link->dst->outputs[0]->out_buf->linesize,
pad->line, pad->line_step, pad->hsub, pad->vsub,
0, bar_y, pad->w, bar_h);
avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
}
}
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
PadContext *pad = link->dst->priv;
AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf;
AVFilterBufferRef *inpic = link->cur_buf;
y += pad->y;
y &= ~((1 << pad->vsub) - 1);
h &= ~((1 << pad->vsub) - 1);
if (!h)
return;
draw_send_bar_slice(link, y, h, slice_dir, 1);
/* left border */
ff_draw_rectangle(outpic->data, outpic->linesize, pad->line, pad->line_step,
pad->hsub, pad->vsub, 0, y, pad->x, h);
if(pad->needs_copy){
ff_copy_rectangle(outpic->data, outpic->linesize,
inpic->data, inpic->linesize, pad->line_step,
pad->hsub, pad->vsub,
pad->x, y, y-pad->y, inpic->video->w, h);
}
/* right border */
ff_draw_rectangle(outpic->data, outpic->linesize,
pad->line, pad->line_step, pad->hsub, pad->vsub,
pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
draw_send_bar_slice(link, y, h, slice_dir, -1);
}
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 = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.get_video_buffer = get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.end_frame = end_frame, },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output, },
{ .name = NULL}},
};
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