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00021 #include "avfilter.h"
00022 #include "libavutil/pixdesc.h"
00023 #include "libavutil/colorspace.h"
00024 #include "libavutil/imgutils.h"
00025 #include "libavutil/parseutils.h"
00026 #include "drawutils.h"
00027
00028 typedef struct {
00029 int w, h;
00030 uint8_t color[4];
00031 AVRational time_base;
00032 uint8_t *line[4];
00033 int line_step[4];
00034 int hsub, vsub;
00035 uint64_t pts;
00036 } ColorContext;
00037
00038 static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
00039 {
00040 ColorContext *color = ctx->priv;
00041 char color_string[128] = "black";
00042 char frame_size [128] = "320x240";
00043 char frame_rate [128] = "25";
00044 AVRational frame_rate_q;
00045 int ret;
00046
00047 if (args)
00048 sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
00049
00050 if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
00051 av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
00052 return AVERROR(EINVAL);
00053 }
00054
00055 if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
00056 frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
00057 av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
00058 return AVERROR(EINVAL);
00059 }
00060 color->time_base.num = frame_rate_q.den;
00061 color->time_base.den = frame_rate_q.num;
00062
00063 if ((ret = av_parse_color(color->color, color_string, -1, ctx)) < 0)
00064 return ret;
00065
00066 return 0;
00067 }
00068
00069 static av_cold void color_uninit(AVFilterContext *ctx)
00070 {
00071 ColorContext *color = ctx->priv;
00072 int i;
00073
00074 for (i = 0; i < 4; i++) {
00075 av_freep(&color->line[i]);
00076 color->line_step[i] = 0;
00077 }
00078 }
00079
00080 static int query_formats(AVFilterContext *ctx)
00081 {
00082 static const enum PixelFormat pix_fmts[] = {
00083 PIX_FMT_ARGB, PIX_FMT_RGBA,
00084 PIX_FMT_ABGR, PIX_FMT_BGRA,
00085 PIX_FMT_RGB24, PIX_FMT_BGR24,
00086
00087 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
00088 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
00089 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
00090 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
00091 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
00092 PIX_FMT_YUVA420P,
00093
00094 PIX_FMT_NONE
00095 };
00096
00097 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
00098 return 0;
00099 }
00100
00101 static int color_config_props(AVFilterLink *inlink)
00102 {
00103 AVFilterContext *ctx = inlink->src;
00104 ColorContext *color = ctx->priv;
00105 uint8_t rgba_color[4];
00106 int is_packed_rgba;
00107 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
00108
00109 color->hsub = pix_desc->log2_chroma_w;
00110 color->vsub = pix_desc->log2_chroma_h;
00111
00112 color->w &= ~((1 << color->hsub) - 1);
00113 color->h &= ~((1 << color->vsub) - 1);
00114 if (av_image_check_size(color->w, color->h, 0, ctx) < 0)
00115 return AVERROR(EINVAL);
00116
00117 memcpy(rgba_color, color->color, sizeof(rgba_color));
00118 ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
00119 inlink->format, rgba_color, &is_packed_rgba, NULL);
00120
00121 av_log(ctx, AV_LOG_INFO, "w:%d h:%d r:%d/%d color:0x%02x%02x%02x%02x[%s]\n",
00122 color->w, color->h, color->time_base.den, color->time_base.num,
00123 color->color[0], color->color[1], color->color[2], color->color[3],
00124 is_packed_rgba ? "rgba" : "yuva");
00125 inlink->w = color->w;
00126 inlink->h = color->h;
00127
00128 return 0;
00129 }
00130
00131 static int color_request_frame(AVFilterLink *link)
00132 {
00133 ColorContext *color = link->src->priv;
00134 AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
00135 picref->video->pixel_aspect = (AVRational) {1, 1};
00136 picref->pts = av_rescale_q(color->pts++, color->time_base, AV_TIME_BASE_Q);
00137 picref->pos = 0;
00138
00139 avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
00140 ff_draw_rectangle(picref->data, picref->linesize,
00141 color->line, color->line_step, color->hsub, color->vsub,
00142 0, 0, color->w, color->h);
00143 avfilter_draw_slice(link, 0, color->h, 1);
00144 avfilter_end_frame(link);
00145 avfilter_unref_buffer(picref);
00146
00147 return 0;
00148 }
00149
00150 AVFilter avfilter_vsrc_color = {
00151 .name = "color",
00152 .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]"),
00153
00154 .priv_size = sizeof(ColorContext),
00155 .init = color_init,
00156 .uninit = color_uninit,
00157
00158 .query_formats = query_formats,
00159
00160 .inputs = (AVFilterPad[]) {{ .name = NULL}},
00161
00162 .outputs = (AVFilterPad[]) {{ .name = "default",
00163 .type = AVMEDIA_TYPE_VIDEO,
00164 .request_frame = color_request_frame,
00165 .config_props = color_config_props },
00166 { .name = NULL}},
00167 };