[FFmpeg-soc] [soc]: r1951 - in libavfilter: Makefile allfilters.c vf_drawbox.c
vitor
subversion at mplayerhq.hu
Sat Mar 1 12:04:16 CET 2008
Author: vitor
Date: Sat Mar 1 12:04:16 2008
New Revision: 1951
Log:
Add box drawing filter. Draws a box of given dimensions
and color in pictures.
This filter is a good template for a filter that
modifies the input frame (like a hardsub filter, for
exemple). It is also a good testbed to the permission
flags implementation.
Contributed by Mike Sullivan (mike <_at_> affinesystems.com).
Added:
libavfilter/vf_drawbox.c
Modified:
libavfilter/Makefile
libavfilter/allfilters.c
Modified: libavfilter/Makefile
==============================================================================
--- libavfilter/Makefile (original)
+++ libavfilter/Makefile Sat Mar 1 12:04:16 2008
@@ -14,6 +14,7 @@ OBJS = allfilters.o \
OBJS-$(CONFIG_VF_CROP) += vf_crop.o
+OBJS-$(CONFIG_VF_DRAWBOX) += vf_drawbox.o
OBJS-$(CONFIG_VF_FPS) += vf_fps.o
OBJS-$(CONFIG_VF_HFLIP) += vf_hflip.o
OBJS-$(CONFIG_VF_NEGATE) += vf_negate.o
Modified: libavfilter/allfilters.c
==============================================================================
--- libavfilter/allfilters.c (original)
+++ libavfilter/allfilters.c Sat Mar 1 12:04:16 2008
@@ -39,6 +39,7 @@ void avfilter_register_all(void)
initialized = 1;
REGISTER_VF(CROP,crop);
+ REGISTER_VF(DRAWBOX,drawbox);
REGISTER_VF(FIFO,fifo);
REGISTER_VF(FORMAT,format);
REGISTER_VF(FPS,fps);
Added: libavfilter/vf_drawbox.c
==============================================================================
--- (empty file)
+++ libavfilter/vf_drawbox.c Sat Mar 1 12:04:16 2008
@@ -0,0 +1,184 @@
+/*
+ * Box drawing filter. Also a nice template for a filter that needs to write
+ * in the input frame.
+ *
+ * Copyright (c) 2008 Mike Sullivan
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#include "avfilter.h"
+
+typedef struct
+{
+ const char *name;
+ unsigned char y;
+ unsigned char cb;
+ unsigned char cr;
+} box_color;
+
+#define NUM_COLORS 8
+static box_color colors[] =
+{
+ {.name = "blue", .y = 40, .cr = 109, .cb = 240},
+ {.name = "red", .y = 81, .cr = 240, .cb = 90},
+ {.name = "black", .y = 16, .cr = 128, .cb = 128},
+ {.name = "white", .y = 255, .cr = 128, .cb = 128},
+ {.name = "green", .y = 144, .cr = 34, .cb = 53},
+ {.name = "yellow", .y = 210, .cr = 146, .cb = 16},
+ {.name = "gray", .y = 128, .cr = 128, .cb = 128},
+ {.name = "grey", .y = 128, .cr = 128, .cb = 128}
+};
+
+typedef struct
+{
+ int x,y,w,h;
+ box_color color;
+ int vsub,hsub; //< chroma subsampling
+} BoxContext;
+
+static void strlwr(char *str)
+{
+ int i = 0;
+ while(str[i] != '\0') {
+ if(isupper(str[i]))
+ str[i] = tolower(str[i]);
+
+ i++;
+ }
+}
+
+static box_color get_color(char *color)
+{
+ box_color tmp;
+ int i;
+ strlwr(color);
+ for(i = NUM_COLORS - 1; i >= 0; i--) {
+ tmp = colors[i];
+ if(!strcmp(color, colors[i].name))
+ break;
+ }
+ return tmp;
+}
+
+static int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ BoxContext *context= ctx->priv;
+ char tmp[1024];
+
+ if(!args || strlen(args) > 1024) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid arguments!\n");
+ return -1;
+ }
+
+ sscanf(args, "%d:%d:%d:%d:%s", &(context->x), &(context->y),
+ &(context->w), &(context->h), tmp);
+
+ context->color = get_color(tmp);
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ avfilter_set_common_formats(ctx,
+ avfilter_make_format_list(10,
+ PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
+ PIX_FMT_YUV411P, PIX_FMT_YUV410P,
+ PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
+ PIX_FMT_YUV440P, PIX_FMT_YUVJ440P)
+ );
+ return 0;
+}
+
+static int config_input(AVFilterLink *link)
+{
+ BoxContext *context = link->dst->priv;
+
+ avcodec_get_chroma_sub_sample(link->format,
+ &context->hsub, &context->vsub);
+
+ return 0;
+}
+
+static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
+{
+ avfilter_start_frame(link->dst->outputs[0], picref);
+}
+
+
+static void draw_box(AVFilterPicRef *pic, BoxContext* context, box_color color)
+{
+ int x,y;
+ int channel;
+ unsigned char *row[4];
+ int xb = context->x;
+ int yb = context->y;
+
+ for (y = yb; (y < yb + context->h) && y < pic->h; y++) {
+ row[0] = pic->data[0] + y * pic->linesize[0];
+
+ for (channel = 1; channel < 3; channel++)
+ row[channel] = pic->data[channel] +
+ pic->linesize[channel] * (y>> context->vsub);
+
+ for (x = xb; (x < xb + context->w) && x < pic->w; x++)
+ if((y - yb < 3) || (yb + context->h - y < 4) ||
+ (x - xb < 3) || (xb + context->w - x < 4)) {
+ row[0][x] = color.y;
+ row[1][x >> context->hsub] = color.cb;
+ row[2][x >> context->hsub] = color.cr;
+ }
+ }
+}
+
+static void end_frame(AVFilterLink *link)
+{
+ BoxContext *context = link->dst->priv;
+ AVFilterLink* output = link->dst->outputs[0];
+ AVFilterPicRef *pic = link->cur_pic;
+
+ draw_box(pic,context,context->color);
+
+ avfilter_draw_slice(output, 0, pic->h);
+ avfilter_end_frame(output);
+}
+
+AVFilter avfilter_vf_drawbox=
+{
+ .name = "drawbox",
+ .priv_size = sizeof(BoxContext),
+ .init = init,
+
+ .query_formats = query_formats,
+ .inputs = (AVFilterPad[]) {{ .name = "default",
+ .type = CODEC_TYPE_VIDEO,
+ .start_frame = start_frame,
+ .end_frame = end_frame,
+ .config_props = config_input,
+ .min_perms = AV_PERM_WRITE |
+ AV_PERM_READ,
+ .rej_perms = AV_PERM_REUSE |
+ AV_PERM_REUSE2},
+ { .name = NULL}},
+ .outputs = (AVFilterPad[]) {{ .name = "default",
+ .type = CODEC_TYPE_VIDEO, },
+ { .name = NULL}},
+};
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