X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=bmusb.h;h=d47ce8e85c4541be65dcd89c7b10ed727781b153;hb=9ada4d5213c6935c3dc2fdeb34938a375f817428;hp=58ad9e7f3d86b0c60fd742921a7a279708ea07f7;hpb=cb414fadb0738aeab971cc9b83c322118015d00b;p=bmusb

diff --git a/bmusb.h b/bmusb.h
index 58ad9e7..d47ce8e 100644
--- a/bmusb.h
+++ b/bmusb.h
@@ -157,7 +157,11 @@ class BMUSBCapture {
 
 // Get details for the given video format; returns false if detection was incomplete.
 // Note: Frame rate is _frame_ rate, not field rate. So 1080i60 gets 30/1, _not_ 60/1.
-bool decode_video_format(uint16_t video_format, int *width, int *height, int *extra_lines_top, int *extra_lines_bottom,
-                         int *frame_rate_nom, int *frame_rate_den, bool *interlaced);
+// "second_field_start" is only valid for interlaced modes; it signifies
+// how many lines from the very top of the frame there are before the second field
+// starts (so it will always be >= height/2 + extra_lines_top).
+bool decode_video_format(uint16_t video_format, unsigned *width, unsigned *height, unsigned *second_field_start,
+                         unsigned *extra_lines_top, unsigned *extra_lines_bottom,
+                         unsigned *frame_rate_nom, unsigned *frame_rate_den, bool *interlaced);
 
 #endif