vsrc_color.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
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 
26 #include "avfilter.h"
27 #include "libavutil/pixdesc.h"
28 #include "libavutil/colorspace.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/parseutils.h"
32 #include "drawutils.h"
33 
34 typedef struct {
35  int w, h;
36  uint8_t color[4];
38  uint8_t *line[4];
39  int line_step[4];
40  int hsub, vsub;
41  uint64_t pts;
42 } ColorContext;
43 
44 static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
45 {
46  ColorContext *color = ctx->priv;
47  char color_string[128] = "black";
48  char frame_size [128] = "320x240";
49  char frame_rate [128] = "25";
50  AVRational frame_rate_q;
51  int ret;
52 
53  if (args)
54  sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
55 
56  if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
57  av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
58  return AVERROR(EINVAL);
59  }
60 
61  if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
62  frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
63  av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
64  return AVERROR(EINVAL);
65  }
66  color->time_base.num = frame_rate_q.den;
67  color->time_base.den = frame_rate_q.num;
68 
69  if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0)
70  return ret;
71 
72  return 0;
73 }
74 
76 {
77  ColorContext *color = ctx->priv;
78  int i;
79 
80  for (i = 0; i < 4; i++) {
81  av_freep(&color->line[i]);
82  color->line_step[i] = 0;
83  }
84 }
85 
87 {
88  static const enum PixelFormat pix_fmts[] = {
92 
99 
101  };
102 
104  return 0;
105 }
106 
107 static int color_config_props(AVFilterLink *inlink)
108 {
109  AVFilterContext *ctx = inlink->src;
110  ColorContext *color = ctx->priv;
111  uint8_t rgba_color[4];
112  int is_packed_rgba;
113  const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
114 
115  color->hsub = pix_desc->log2_chroma_w;
116  color->vsub = pix_desc->log2_chroma_h;
117 
118  color->w &= ~((1 << color->hsub) - 1);
119  color->h &= ~((1 << color->vsub) - 1);
120  if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
121  return AVERROR(EINVAL);
122 
123  memcpy(rgba_color, color->color, sizeof(rgba_color));
124  ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
125  inlink->format, rgba_color, &is_packed_rgba, NULL);
126 
127  av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
128  color->w, color->h, color->time_base.den, color->time_base.num,
129  color->color[0], color->color[1], color->color[2], color->color[3],
130  is_packed_rgba ? "rgba" : "yuva");
131  inlink->w = color->w;
132  inlink->h = color->h;
133  inlink->time_base = color->time_base;
134 
135  return 0;
136 }
137 
139 {
140  ColorContext *color = link->src->priv;
141  AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
142  picref->video->pixel_aspect = (AVRational) {1, 1};
143  picref->pts = color->pts++;
144  picref->pos = -1;
145 
146  avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
147  ff_draw_rectangle(picref->data, picref->linesize,
148  color->line, color->line_step, color->hsub, color->vsub,
149  0, 0, color->w, color->h);
150  avfilter_draw_slice(link, 0, color->h, 1);
151  avfilter_end_frame(link);
152  avfilter_unref_buffer(picref);
153 
154  return 0;
155 }
156 
158  .name = "color",
159  .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
160 
161  .priv_size = sizeof(ColorContext),
162  .init = color_init,
163  .uninit = color_uninit,
164 
166 
167  .inputs = (AVFilterPad[]) {{ .name = NULL}},
168 
169  .outputs = (AVFilterPad[]) {{ .name = "default",
170  .type = AVMEDIA_TYPE_VIDEO,
171  .request_frame = color_request_frame,
172  .config_props = color_config_props },
173  { .name = NULL}},
174 };
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:68
AVFilterBufferRef * avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: avfilter.c:289
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:123
AVFilterBufferRefVideoProps * video
video buffer specific properties
Definition: avfilter.h:141
int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str)
Parse str and put in width_ptr and height_ptr the detected values.
Definition: parseutils.c:95
int linesize[8]
number of bytes per line
Definition: avfilter.h:127
misc image utilities
uint8_t * line[4]
Definition: vsrc_color.c:38
int num
numerator
Definition: rational.h:44
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.
int vsub
chroma subsampling values
Definition: vsrc_color.c:40
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:66
static int color_config_props(AVFilterLink *inlink)
Definition: vsrc_color.c:107
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:147
uint8_t color[4]
Definition: vsrc_color.c:36
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV444P and setting color_...
Definition: pixfmt.h:78
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
int line_step[4]
Definition: vsrc_color.c:39
void avfilter_end_frame(AVFilterLink *link)
Notifie the next filter that the current frame has finished.
Definition: avfilter.c:430
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_...
Definition: pixfmt.h:76
AVRational pixel_aspect
pixel aspect ratio
Definition: avfilter.h:109
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:336
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
int64_t pts
presentation timestamp.
Definition: avfilter.h:135
A filter pad used for either input or output.
Definition: avfilter.h:312
uint64_t pts
Definition: vsrc_color.c:41
static int query_formats(AVFilterContext *ctx)
Definition: vsrc_color.c:86
int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, uint8_t dst_color[4], enum PixelFormat pix_fmt, uint8_t rgba_color[4], int *is_packed_rgba, uint8_t rgba_map_ptr[4])
Definition: drawutils.c:26
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
#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
Definition: graph2dot.c:39
static av_cold void color_uninit(AVFilterContext *ctx)
Definition: vsrc_color.c:75
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
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:69
struct AVRational AVRational
rational number numerator/denominator
AVRational time_base
Definition: vsrc_color.c:37
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:213
AVFilter avfilter_vsrc_color
Definition: vsrc_color.c:157
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
void avfilter_unref_buffer(AVFilterBufferRef *ref)
Remove a reference to a buffer.
Definition: avfilter.c:73
A reference to an AVFilterBuffer.
Definition: avfilter.h:124
NULL
Definition: eval.c:50
misc drawing utilities
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:55
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
Filter definition.
Definition: avfilter.h:497
AVFilterBufferRef * avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
Add a new reference to a buffer.
Definition: avfilter.c:47
rational number numerator/denominator
Definition: rational.h:43
void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
Notify the next filter of the start of a frame.
Definition: avfilter.c:400
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_boxblur.c:113
const char * name
filter name
Definition: avfilter.h:498
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:67
misc parsing utilities
PixelFormat
Pixel format.
Definition: pixfmt.h:62
int den
denominator
Definition: rational.h:45
static const uint8_t color[]
Definition: log.c:44
static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
Definition: vsrc_color.c:44
static AVRational frame_rate
Definition: ffmpeg.c:137
#define AV_PERM_WRITE
can write to the buffer
Definition: avfilter.h:82
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:66
int64_t pos
byte position in stream, -1 if unknown
Definition: avfilter.h:136
uint8_t * data[8]
picture/audio data for each plane
Definition: avfilter.h:126
An instance of a filter.
Definition: avfilter.h:538
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
#define AV_LOG_INFO
Definition: log.h:119
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
static int color_request_frame(AVFilterLink *link)
Definition: vsrc_color.c:138
void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4], uint8_t *src[4], int pixelstep[4], int hsub, int vsub, int x, int y, int w, int h)
Definition: drawutils.c:79
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101