/*
  * Copyright (c) 2010 Stefano Sabatini
  *
  * 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
  */
 

 /**
  * @file
  * color source
  */
 

 #include "avfilter.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/colorspace.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/parseutils.h"
 #include "drawutils.h"
 
 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_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_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, -1, 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 query_formats(AVFilterContext *ctx)
 {
     static const enum PixelFormat pix_fmts[] = {
         PIX_FMT_ARGB,         PIX_FMT_RGBA,
         PIX_FMT_ABGR,         PIX_FMT_BGRA,
         PIX_FMT_RGB24,        PIX_FMT_BGR24,
 
         PIX_FMT_YUV444P,      PIX_FMT_YUV422P,
         PIX_FMT_YUV420P,      PIX_FMT_YUV411P,
         PIX_FMT_YUV410P,      PIX_FMT_YUV440P,
         PIX_FMT_YUVJ444P,     PIX_FMT_YUVJ422P,
         PIX_FMT_YUVJ420P,     PIX_FMT_YUVJ440P,
         PIX_FMT_YUVA420P,
 
         PIX_FMT_NONE
     };
 

     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

     return 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 (av_image_check_size(color->w, color->h, 0, ctx) < 0)
         return AVERROR(EINVAL);
 
     memcpy(rgba_color, color->color, sizeof(rgba_color));
     ff_fill_line_with_color(color->line, color->line_step, color->w, color->color,
                             inlink->format, rgba_color, &is_packed_rgba, NULL);
 
     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;

     inlink->time_base = color->time_base;

 
     return 0;
 }
 
 static int color_request_frame(AVFilterLink *link)
 {
     ColorContext *color = link->src->priv;
     AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);

     picref->video->sample_aspect_ratio = (AVRational) {1, 1};

     picref->pts = color->pts++;

     picref->pos = -1;

 
     avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
     ff_draw_rectangle(picref->data, picref->linesize,
                       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_buffer(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            = AVMEDIA_TYPE_VIDEO,
                                     .request_frame   = color_request_frame,
                                     .config_props    = color_config_props },
                                   { .name = NULL}},
 };