From 7cdd319b01cfacc5ab07744ee3422a46b6f2c754 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 11 Sep 2015 13:28:51 +0200 Subject: [PATCH] avcodec/mjpegdec: Fix decoding RGBA RCT LJPEG Signed-off-by: Michael Niedermayer (cherry picked from commit 055e56e9f76da3298f1b59bf5ea46f570e844600) Signed-off-by: Michael Niedermayer --- libavcodec/mjpegdec.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c index c2a92fae36..4a7862520c 100644 --- a/libavcodec/mjpegdec.c +++ b/libavcodec/mjpegdec.c @@ -946,7 +946,14 @@ 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; icomp_index[i]; if (s->bits <= 8) {