From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Sun, 17 Mar 2019 18:35:15 +0000 (+0100)
Subject: Add a call create_frame() to help performance in VA-API MJPEG uploads.
X-Git-Tag: 0.7.4~1
X-Git-Url: https://git.sesse.net/?p=bmusb;a=commitdiff_plain;h=03e38890b599efe6ac906fdb70b43cda63f11d01

Add a call create_frame() to help performance in VA-API MJPEG uploads.
---

diff --git a/bmusb/bmusb.h b/bmusb/bmusb.h
index a484496..cec84d9 100644
--- a/bmusb/bmusb.h
+++ b/bmusb/bmusb.h
@@ -73,6 +73,22 @@ class FrameAllocator {
 	// if so, the frame in progress will be dropped.
 	virtual Frame alloc_frame() = 0;
 
+	// Similar to alloc_frame(), with two additional restrictions:
+	//
+	//  - The width, height and stride given must be correct
+	//    (can not be changed after the call).
+	//  - create_frame(), unlike alloc_frame(), is allowed to sleep
+	//    (so bmusb will never call it, but in Nageru, other producers
+	//    might)
+	//
+	// These two restrictions are relevant for Nageru, since it means that
+	// it can make frame_copy point directly into a VA-API buffer to avoid
+	// an extra copy.
+	virtual Frame create_frame(size_t width, size_t height, size_t stride)
+	{
+		return alloc_frame();
+	}
+
 	virtual void release_frame(Frame frame) = 0;
 };