avcodec: add avpriv_color_frame()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/internal.h

@@ -124,6 +124,9 @@ unsigned int avpriv_toupper4(unsigned int x);
  */
 void ff_init_buffer_info(AVCodecContext *s, AVFrame *frame);
 
+
+void avpriv_color_frame(AVFrame *frame, const int color[4]);
+
 /**
  * Remove and free all side data from packet.
  */

libavcodec/utils.c

@@ -501,6 +501,28 @@ static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
     return 0;
 }
 
+void avpriv_color_frame(AVFrame *frame, const int c[4])
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
+    int p, y, x;
+
+    av_assert0(desc->flags & PIX_FMT_PLANAR);
+
+    for (p = 0; p<desc->nb_components; p++) {
+        uint8_t *dst = frame->data[p];
+        int is_chroma = p == 1 || p == 2;
+        int bytes = -((-frame->width) >> (is_chroma ? desc->log2_chroma_w : 0));
+        for (y = 0; y<-((-frame->height) >> (is_chroma ? desc->log2_chroma_h : 0)); y++){
+            if (desc->comp[0].depth_minus1 >= 8) {
+                for (x = 0; x<bytes; x++)
+                    ((uint16_t*)dst)[x] = c[p];
+            }else
+                memset(dst, c[p], bytes);
+            dst += frame->linesize[p];
+        }
+    }
+}
+
 int avcodec_default_get_buffer(AVCodecContext *avctx, AVFrame *frame)
 {
     frame->type = FF_BUFFER_TYPE_INTERNAL;