Add color source.

Originally committed as revision 24282 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2010-07-17 10:14:52 +00:00
parent bbfb2c8077
commit 23ccf3c7a7
5 changed files with 168 additions and 2 deletions

View File

@ -229,6 +229,45 @@ Flip the input video vertically.
Below is a description of the currently available video sources.
@section color
Provide an uniformly colored input.
It accepts the following parameters:
@var{color}:@var{frame_size}:@var{frame_width}
Follows the description of the accepted parameters.
@table @option
@item color
Specify the color of the source. It can be the name of a color (case
insensitive match) or a 0xRRGGBB[AA] sequence, possibly followed by an
alpha specifier. The default value is "black".
@item frame_size
Specify the size of the sourced video, it may be a string of the form
@var{width}x@var{heigth}, or the name of a size abbreviation. The
default value is "320x240".
@item frame_rate
Specify the frame rate of the sourced video, as the number of frames
generated per second. It has to be a string in the format
@var{frame_rate_num}/@var{frame_rate_den}, an integer number, a float
number or a valid video frame rate abbreviation. The default value is
"25".
@end table
For example the following graph description will generate a red source
with an opacity of 0.2, with size "qcif" and a frame rate of 10
frames per second, which will be overlayed over the source connected
to the pad with identifier "in".
@example
"color=red@@0.2:qcif:10 [color]; [in][color] overlay [out]"
@end example
@section nullsrc
Null video source, never return images. It is mainly useful as a

View File

@ -28,6 +28,7 @@ OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o
OBJS-$(CONFIG_BUFFER_FILTER) += vsrc_buffer.o
OBJS-$(CONFIG_COLOR_FILTER) += vf_pad.o
OBJS-$(CONFIG_NULLSRC_FILTER) += vsrc_nullsrc.o
OBJS-$(CONFIG_NULLSINK_FILTER) += vsink_nullsink.o

View File

@ -48,6 +48,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (VFLIP, vflip, vf);
REGISTER_FILTER (BUFFER, buffer, vsrc);
REGISTER_FILTER (COLOR, color, vsrc);
REGISTER_FILTER (NULLSRC, nullsrc, vsrc);
REGISTER_FILTER (NULLSINK, nullsink, vsink);

View File

@ -25,7 +25,7 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 1
#define LIBAVFILTER_VERSION_MINOR 22
#define LIBAVFILTER_VERSION_MINOR 23
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

View File

@ -21,13 +21,14 @@
/**
* @file
* video padding filter
* video padding filter and color source
*/
#include "avfilter.h"
#include "parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/colorspace.h"
#include "libavcodec/avcodec.h"
enum { RED = 0, GREEN, BLUE, ALPHA };
@ -337,3 +338,127 @@ AVFilter avfilter_vf_pad = {
};
#endif /* CONFIG_PAD_FILTER */
#if CONFIG_COLOR_FILTER
typedef struct {
int w, h;
uint8_t color[4];
AVRational time_base;
uint8_t *line[4];
int line_step[4];
int hsub, vsub; ///< chroma subsampling values
uint64_t pts;
} ColorContext;
static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
{
ColorContext *color = ctx->priv;
char color_string[128] = "black";
char frame_size [128] = "320x240";
char frame_rate [128] = "25";
AVRational frame_rate_q;
int ret;
if (args)
sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
if (av_parse_video_frame_size(&color->w, &color->h, frame_size) < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
return AVERROR(EINVAL);
}
if (av_parse_video_frame_rate(&frame_rate_q, frame_rate) < 0 ||
frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
return AVERROR(EINVAL);
}
color->time_base.num = frame_rate_q.den;
color->time_base.den = frame_rate_q.num;
if ((ret = av_parse_color(color->color, color_string, ctx)) < 0)
return ret;
return 0;
}
static av_cold void color_uninit(AVFilterContext *ctx)
{
ColorContext *color = ctx->priv;
int i;
for (i = 0; i < 4; i++) {
av_freep(&color->line[i]);
color->line_step[i] = 0;
}
}
static int color_config_props(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->src;
ColorContext *color = ctx->priv;
uint8_t rgba_color[4];
int is_packed_rgba;
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
color->hsub = pix_desc->log2_chroma_w;
color->vsub = pix_desc->log2_chroma_h;
color->w &= ~((1 << color->hsub) - 1);
color->h &= ~((1 << color->vsub) - 1);
if (avcodec_check_dimensions(ctx, color->w, color->h) < 0)
return AVERROR(EINVAL);
memcpy(rgba_color, color->color, sizeof(rgba_color));
fill_line_with_color(color->line, color->line_step, color->w, color->color,
inlink->format, rgba_color, &is_packed_rgba);
av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
color->w, color->h, color->time_base.den, color->time_base.num,
color->color[0], color->color[1], color->color[2], color->color[3],
is_packed_rgba ? "rgba" : "yuva");
inlink->w = color->w;
inlink->h = color->h;
return 0;
}
static int color_request_frame(AVFilterLink *link)
{
ColorContext *color = link->src->priv;
AVFilterPicRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
picref->pixel_aspect = (AVRational) {1, 1};
picref->pts = av_rescale_q(color->pts++, color->time_base, AV_TIME_BASE_Q);
picref->pos = 0;
avfilter_start_frame(link, avfilter_ref_pic(picref, ~0));
draw_rectangle(picref,
color->line, color->line_step, color->hsub, color->vsub,
0, 0, color->w, color->h);
avfilter_draw_slice(link, 0, color->h, 1);
avfilter_end_frame(link);
avfilter_unref_pic(picref);
return 0;
}
AVFilter avfilter_vsrc_color = {
.name = "color",
.description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
.priv_size = sizeof(ColorContext),
.init = color_init,
.uninit = color_uninit,
.query_formats = query_formats,
.inputs = (AVFilterPad[]) {{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = CODEC_TYPE_VIDEO,
.request_frame = color_request_frame,
.config_props = color_config_props },
{ .name = NULL}},
};
#endif /* CONFIG_COLOR_FILTER */