cam: sdl_sink: Support multi-planar formats

In order to prepare for NV12 support, implement support for multi-planar
formats in the SDL sink. This mainly consists in passing a vector of
plane data to the SDLTexture::update() function instead of a single
value.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Eric Curtin <ecurtin@redhat.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 15 insertions, 8 deletions

diff --git a/src/cam/sdl_sink.cpp b/src/cam/sdl_sink.cpp
index 04350bd5..4ca97576 100644
--- a/src/cam/sdl_sink.cpp
+++ b/src/cam/sdl_sink.cpp
@@ -185,16 +185,23 @@ void SDLSink::renderBuffer(FrameBuffer *buffer)
 {
 	Image *image = mappedBuffers_[buffer].get();
 
-	/* \todo Implement support for multi-planar formats. */
-	const FrameMetadata::Plane &meta = buffer->metadata().planes()[0];
+	std::vector<Span<const uint8_t>> planes;
+	unsigned int i = 0;
 
-	Span<uint8_t> data = image->data(0);
-	if (meta.bytesused > data.size())
-		std::cerr << "payload size " << meta.bytesused
-			  << " larger than plane size " << data.size()
-			  << std::endl;
+	planes.reserve(buffer->metadata()->planes().size());
+
+	for (const FrameMetadata::Plane &meta : buffer->metadata().planes()) {
+		Span<uint8_t> data = image->data(i);
+		if (meta.bytesused > data.size())
+			std::cerr << "payload size " << meta.bytesused
+				  << " larger than plane size " << data.size()
+				  << std::endl;
+
+		planes.push_back(data);
+		i++;
+	}
 
-	texture_->update(data);
+	texture_->update(planes);
 
 	SDL_RenderClear(renderer_);
 	SDL_RenderCopy(renderer_, texture_->get(), nullptr, nullptr);