vf_drawbox.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
27 #include "libavutil/colorspace.h"
28 #include "libavutil/pixdesc.h"
29 #include "libavutil/parseutils.h"
30 #include "avfilter.h"
31 
32 enum { Y, U, V, A };
33 
34 typedef struct {
35  int x, y, w, h;
36  unsigned char yuv_color[4];
37  int vsub, hsub;
39 
40 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
41 {
43  char color_str[1024] = "black";
44  uint8_t rgba_color[4];
45 
46  drawbox->x = drawbox->y = drawbox->w = drawbox->h = 0;
47 
48  if (args)
49  sscanf(args, "%d:%d:%d:%d:%s",
50  &drawbox->x, &drawbox->y, &drawbox->w, &drawbox->h, color_str);
51 
52  if (av_parse_color(rgba_color, color_str, -1, ctx) < 0)
53  return AVERROR(EINVAL);
54 
55  drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
56  drawbox->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
57  drawbox->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
58  drawbox->yuv_color[A] = rgba_color[3];
59 
60  return 0;
61 }
62 
64 {
65  enum PixelFormat pix_fmts[] = {
71  };
72 
74  return 0;
75 }
76 
77 static int config_input(AVFilterLink *inlink)
78 {
79  DrawBoxContext *drawbox = inlink->dst->priv;
80 
81  drawbox->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
82  drawbox->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
83 
84  if (drawbox->w == 0) drawbox->w = inlink->w;
85  if (drawbox->h == 0) drawbox->h = inlink->h;
86 
87  av_log(inlink->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
88  drawbox->w, drawbox->y, drawbox->w, drawbox->h,
89  drawbox->yuv_color[Y], drawbox->yuv_color[U], drawbox->yuv_color[V], drawbox->yuv_color[A]);
90 
91  return 0;
92 }
93 
94 static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
95 {
96  DrawBoxContext *drawbox = inlink->dst->priv;
97  int plane, x, y, xb = drawbox->x, yb = drawbox->y;
98  unsigned char *row[4];
99  AVFilterBufferRef *picref = inlink->cur_buf;
100 
101  for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + drawbox->h); y++) {
102  row[0] = picref->data[0] + y * picref->linesize[0];
103 
104  for (plane = 1; plane < 3; plane++)
105  row[plane] = picref->data[plane] +
106  picref->linesize[plane] * (y >> drawbox->vsub);
107 
108  for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++) {
109  double alpha = (double)drawbox->yuv_color[A] / 255;
110 
111  if ((y - yb < 3) || (yb + drawbox->h - y < 4) ||
112  (x - xb < 3) || (xb + drawbox->w - x < 4)) {
113  row[0][x ] = (1 - alpha) * row[0][x ] + alpha * drawbox->yuv_color[Y];
114  row[1][x >> drawbox->hsub] = (1 - alpha) * row[1][x >> drawbox->hsub] + alpha * drawbox->yuv_color[U];
115  row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V];
116  }
117  }
118  }
119 
120  avfilter_draw_slice(inlink->dst->outputs[0], y0, h, 1);
121 }
122 
124  .name = "drawbox",
125  .description = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
126  .priv_size = sizeof(DrawBoxContext),
127  .init = init,
128 
130  .inputs = (AVFilterPad[]) {{ .name = "default",
131  .type = AVMEDIA_TYPE_VIDEO,
132  .config_props = config_input,
133  .get_video_buffer = avfilter_null_get_video_buffer,
134  .start_frame = avfilter_null_start_frame,
135  .draw_slice = draw_slice,
136  .end_frame = avfilter_null_end_frame,
137  .min_perms = AV_PERM_WRITE | AV_PERM_READ,
138  .rej_perms = AV_PERM_PRESERVE },
139  { .name = NULL}},
140  .outputs = (AVFilterPad[]) {{ .name = "default",
141  .type = AVMEDIA_TYPE_VIDEO, },
142  { .name = NULL}},
143 };
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:68
int linesize[8]
number of bytes per line
Definition: avfilter.h:127
Definition: vf_drawbox.c:32
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV422P and setting color_...
Definition: pixfmt.h:77
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:71
Various defines for YUV<->RGB conversion.
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:66
Definition: vf_drawbox.c:32
#define AV_PERM_READ
can read from the buffer
Definition: avfilter.h:81
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV444P and setting color_...
Definition: pixfmt.h:78
void avfilter_null_end_frame(AVFilterLink *link)
end_frame() handler for filters which simply pass video along
Definition: defaults.c:278
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:99
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:64
#define av_cold
Definition: attributes.h:71
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:70
static int query_formats(AVFilterContext *ctx)
Definition: vf_drawbox.c:63
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_...
Definition: pixfmt.h:76
int av_parse_color(uint8_t *rgba_color, const char *color_string, int slen, void *log_ctx)
Put the RGBA values that correspond to color_string in rgba_color.
Definition: parseutils.c:301
A filter pad used for either input or output.
Definition: avfilter.h:312
static int config_input(AVFilterLink *inlink)
Definition: vf_drawbox.c:77
void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: defaults.c:234
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:75
#define AVERROR(e)
Definition: error.h:43
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
Definition: vf_drawbox.c:40
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
void * priv
private data for use by the filter
Definition: avfilter.h:553
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
AVFilterFormats * avfilter_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:90
const AVPixFmtDescriptor av_pix_fmt_descriptors[PIX_FMT_NB]
The array of all the pixel format descriptors.
Definition: pixdesc.c:119
#define FFMAX(a, b)
Definition: common.h:53
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:69
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of PIX_FMT_YUV440P and setting color_range ...
Definition: pixfmt.h:100
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
Send a slice to the next filter.
Definition: avfilter.c:447
A reference to an AVFilterBuffer.
Definition: avfilter.h:124
NULL
Definition: eval.c:50
Definition: vf_drawbox.c:32
static void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y, unsigned int width, unsigned int height, uint8_t *line[4], int pixel_step[4], uint8_t color[4], int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
Definition: vf_drawtext.c:686
static void draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
Definition: vf_drawbox.c:94
int hsub
chroma subsampling
Definition: vf_drawbox.c:37
AVFilter avfilter_vf_drawbox
Definition: vf_drawbox.c:123
void avfilter_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
start_frame() handler for filters which simply pass video along
Definition: defaults.c:268
Filter definition.
Definition: avfilter.h:497
const char * name
filter name
Definition: avfilter.h:498
AVFilterBufferRef * avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
get_video_buffer() handler for filters which simply pass video along
Definition: defaults.c:288
misc parsing utilities
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:551
#define RGB_TO_U_CCIR(r1, g1, b1, shift)
Definition: colorspace.h:103
#define AV_PERM_PRESERVE
nobody else can overwrite the buffer
Definition: avfilter.h:83
#define RGB_TO_V_CCIR(r1, g1, b1, shift)
Definition: colorspace.h:107
PixelFormat
Pixel format.
Definition: pixfmt.h:62
#define AV_PERM_WRITE
can write to the buffer
Definition: avfilter.h:82
#define RGB_TO_Y_CCIR(r, g, b)
Definition: colorspace.h:99
uint8_t * data[8]
picture/audio data for each plane
Definition: avfilter.h:126
Definition: vf_drawbox.c:32
An instance of a filter.
Definition: avfilter.h:538
#define AV_LOG_INFO
Definition: log.h:119
unsigned char yuv_color[4]
Definition: vf_drawbox.c:36