lavd/dshow: Interpret negative height as bottom-down frame.

Fixes ticket #7436.
6 years ago · 1ba32a3c46
parent 26902f2ef0
commit 1ba32a3c46
1 changed files with 4 additions and 0 deletions
--- a/libavdevice/dshow.c
+++ b/libavdevice/dshow.c
@ -996,11 +996,15 @@ dshow_add_device(AVFormatContext *avctx,
            par->codec_id = AV_CODEC_ID_RAWVIDEO;
            if (bih->biCompression == BI_RGB || bih->biCompression == BI_BITFIELDS) {
                par->bits_per_coded_sample = bih->biBitCount;
+                if (par->height < 0) {
+                    par->height *= -1;
+                } else {
                par->extradata = av_malloc(9 + AV_INPUT_BUFFER_PADDING_SIZE);
                if (par->extradata) {
                    par->extradata_size = 9;
                    memcpy(par->extradata, "BottomUp", 9);
                }
+                }
            }
        }
    } else {