X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmjpegdec.c;h=1a86b7bc31503dc32d4ea02ae7104757e2af0c23;hb=0f98fd30e2d3c7254a1c56ce42a9a8bf0f6dc0eb;hp=818f8c93008d0c04d8321c24e5aed5996937e0e4;hpb=8998caf0a4d7e55f040c419f984be885ca0688db;p=ffmpeg

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 818f8c93008..1a86b7bc315 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -995,7 +995,14 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
                 skip_bits(&s->gb, 16); /* skip RSTn */
             }
         }
-        if (s->nb_components == 4) {
+        if (s->rct && s->nb_components == 4) {
+            for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
+                ptr[4*mb_x + 2] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200) >> 2);
+                ptr[4*mb_x + 1] = buffer[mb_x][1] + ptr[4*mb_x + 2];
+                ptr[4*mb_x + 3] = buffer[mb_x][2] + ptr[4*mb_x + 2];
+                ptr[4*mb_x + 0] = buffer[mb_x][3];
+            }
+        } else if (s->nb_components == 4) {
             for(i=0; i<nb_components; i++) {
                 int c= s->comp_index[i];
                 if (s->bits <= 8) {
@@ -2158,7 +2165,7 @@ fail:
     return ret;
 the_end:
 
-    is16bit = av_pix_fmt_desc_get(s->avctx->pix_fmt)->comp[0].step_minus1;
+    is16bit = av_pix_fmt_desc_get(s->avctx->pix_fmt)->comp[0].step > 1;
 
     if (AV_RB32(s->upscale_h)) {
         int p;