[misc-filters PATCH 6/8] Add color source.
Stefano Sabatini
stefano.sabatini-lala
Thu Jul 1 21:51:44 CEST 2010
---
doc/filters.texi | 39 ++++++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_pad.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 166 insertions(+), 0 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index c6b9161..e3c1163 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -217,6 +217,45 @@ Flip the input video vertically.
Below is a description of the currently available video sources.
+ at section color
+
+Provide an uniformly colored input.
+
+It accepts the following parameters:
+ at var{color}:@var{frame_size}:@var{frame_width}
+
+Follows the description of the accepted parameters.
+
+ at table @option
+
+ at 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".
+
+ at item frame_size
+Specify the size of the sourced video, it may be a string of the form
+ at var{width}x at var{heigth}, or the name of a size abbreviation. The
+default value is "320x240".
+
+ at 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
+ at 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".
+
+ at 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 input pad with identifier "in".
+
+ at example
+"color=red@@0.2:qcif:10 [color]; [in][color] overlay [out]"
+ at 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 0874d85..3a238c6 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 373dd65..0b4b606 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/vf_pad.c b/libavfilter/vf_pad.c
index 37a0ae8..242e391 100644
--- a/libavfilter/vf_pad.c
+++ b/libavfilter/vf_pad.c
@@ -337,3 +337,128 @@ 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 *priv = 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, "%128[^:]:%128[^:]:%128s", color_string, frame_size, frame_rate);
+
+ if (av_parse_video_frame_size(&priv->w, &priv->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);
+ }
+ priv->time_base.num = frame_rate_q.den;
+ priv->time_base.den = frame_rate_q.num;
+
+ if ((ret = av_parse_color(priv->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 *priv = link->src->priv;
+ AVFilterPicRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, priv->w, priv->h);
+ picref->pixel_aspect = (AVRational) {1, 1};
+ picref->pts = av_rescale_q(priv->pts++, priv->time_base, AV_TIME_BASE_Q);
+ picref->pos = 0;
+
+ avfilter_start_frame(link, avfilter_ref_pic(picref, ~0));
+ draw_rectangle(picref,
+ priv->line, priv->line_step, priv->hsub, priv->vsub,
+ 0, 0, priv->w, priv->h);
+ avfilter_draw_slice(link, 0, priv->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."),
+
+ .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 */
--
1.7.1
--1LKvkjL3sHcu1TtY--
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