From 23ccf3c7a7621175156b4f8f89d321f081adbe59 Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Sat, 17 Jul 2010 10:14:52 +0000 Subject: [PATCH] Add color source. Originally committed as revision 24282 to svn://svn.ffmpeg.org/ffmpeg/trunk --- doc/filters.texi | 39 ++++++++++++ libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/avfilter.h | 2 +- libavfilter/vf_pad.c | 127 ++++++++++++++++++++++++++++++++++++++- 5 files changed, 168 insertions(+), 2 deletions(-) diff --git a/doc/filters.texi b/doc/filters.texi index cd4364a786..dea8556c77 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -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 diff --git a/libavfilter/Makefile b/libavfilter/Makefile index e1f5f5c8f4..c2c1a2124d 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -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 diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index 90be2b45eb..e8bc771012 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -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); diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h index dff685fc2d..872bd9a3f6 100644 --- a/libavfilter/avfilter.h +++ b/libavfilter/avfilter.h @@ -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, \ diff --git a/libavfilter/vf_pad.c b/libavfilter/vf_pad.c index af80a68af5..8224c7d776 100644 --- a/libavfilter/vf_pad.c +++ b/libavfilter/vf_pad.c @@ -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 */