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FFmpeg/libavfilter/vf_pad.c
Stefano Sabatini 73a4f7c21b pad: make the filter parametric 
Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
2011-04-26 07:43:34 +02:00

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/*
* Copyright (c) 2008 vmrsss
* Copyright (c) 2009 Stefano Sabatini
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* video padding filter and color source
*/
#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 "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",
"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_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_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_HSUB] = 1<<pad->hsub;
var_values[VAR_VSUB] = 2<<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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