prores: skip alpha if present

[ffmpeg] / libavcodec / jpeglsdec.c

diff --git a/libavcodec/jpeglsdec.c b/libavcodec/jpeglsdec.c
index 8ea2cb5bdb9fe6e0912a6a25136d01aa5f045457..5e98b64644c23261e39911040e1726340937fc7f 100644 (file)
--- a/libavcodec/jpeglsdec.c
+++ b/libavcodec/jpeglsdec.c
@@ -286,8 +286,8 @@ int ff_jpegls_decode_picture(MJpegDecodeContext *s, int near, int point_transfor
 //    av_log(s->avctx, AV_LOG_DEBUG, "JPEG-LS params: %ix%i NEAR=%i MV=%i T(%i,%i,%i) RESET=%i, LIMIT=%i, qbpp=%i, RANGE=%i\n",s->width,s->height,state->near,state->maxval,state->T1,state->T2,state->T3,state->reset,state->limit,state->qbpp, state->range);
 //    av_log(s->avctx, AV_LOG_DEBUG, "JPEG params: ILV=%i Pt=%i BPP=%i, scan = %i\n", ilv, point_transform, s->bits, s->cur_scan);
     if(ilv == 0) { /* separate planes */
-        off = s->cur_scan - 1;
         stride = (s->nb_components > 1) ? 3 : 1;
+        off = av_clip(s->cur_scan - 1, 0, stride);
         width = s->width * stride;
         cur += off;
         for(i = 0; i < s->height; i++) {