From 21cffe09f272f510c0a6d3e7c2fa0fff79653f30 Mon Sep 17 00:00:00 2001 From: "Steinar H. Gunderson" Date: Sun, 15 Jan 2017 11:52:10 +0100 Subject: [PATCH] Add a specification for how the official DeckLink driver stores interlaced frmaes. --- bmusb/bmusb.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/bmusb/bmusb.h b/bmusb/bmusb.h index 6aabd51..b61b66f 100644 --- a/bmusb/bmusb.h +++ b/bmusb/bmusb.h @@ -102,8 +102,10 @@ struct VideoMode { // Represents the format of an actual frame coming in. // Note: Frame rate is _frame_ rate, not field rate. So 1080i60 gets 30/1, _not_ 60/1. -// "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 +// "second_field_start" is only valid for interlaced modes. If it is 1, +// the two fields are actually stored interlaced (ie., every other line). +// If not, each field is stored consecutively, and 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). struct VideoFormat { uint16_t id = 0; // For debugging/logging only. -- 2.39.2