cam: sdl_sink: Add MJPG support to SDL sink

So we have at least two supported capturing pixel formats (although
many possible output pixel formats thanks to SDL conversion). MJPG
support only built in if SDL2_image is available, provides
decompression.

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

1 files changed, 25 insertions, 0 deletions

diff --git a/src/cam/sdl_texture_mjpg.cpp b/src/cam/sdl_texture_mjpg.cpp
new file mode 100644
index 00000000..69e99ad3
--- /dev/null
+++ b/src/cam/sdl_texture_mjpg.cpp
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2022, Ideas on Board Oy
+ *
+ * sdl_texture_mjpg.cpp - SDL Texture MJPG
+ */
+
+#include "sdl_texture_mjpg.h"
+
+#include <SDL2/SDL_image.h>
+
+using namespace libcamera;
+
+SDLTextureMJPG::SDLTextureMJPG(const SDL_Rect &rect)
+	: SDLTexture(rect, SDL_PIXELFORMAT_RGB24, 0)
+{
+}
+
+void SDLTextureMJPG::update(const Span<uint8_t> &data)
+{
+	SDL_RWops *bufferStream = SDL_RWFromMem(data.data(), data.size());
+	SDL_Surface *frame = IMG_Load_RW(bufferStream, 0);
+	SDL_UpdateTexture(ptr_, nullptr, frame->pixels, frame->pitch);
+	SDL_FreeSurface(frame);
+}