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-rw-r--r--src/cam/sdl_sink.cpp194
1 files changed, 194 insertions, 0 deletions
diff --git a/src/cam/sdl_sink.cpp b/src/cam/sdl_sink.cpp
new file mode 100644
index 00000000..4c74bce7
--- /dev/null
+++ b/src/cam/sdl_sink.cpp
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2022, Ideas on Board Oy
+ *
+ * sdl_sink.h - SDL Sink
+ */
+
+#include "sdl_sink.h"
+
+#include <assert.h>
+#include <fcntl.h>
+#include <iomanip>
+#include <iostream>
+#include <signal.h>
+#include <sstream>
+#include <string.h>
+#include <unistd.h>
+
+#include <libcamera/camera.h>
+#include <libcamera/formats.h>
+
+#include "event_loop.h"
+#include "image.h"
+#include "sdl_texture_yuyv.h"
+
+using namespace libcamera;
+
+using namespace std::chrono_literals;
+
+SDLSink::SDLSink()
+ : window_(nullptr), renderer_(nullptr), rect_({}),
+ init_(false)
+{
+}
+
+SDLSink::~SDLSink()
+{
+ stop();
+}
+
+int SDLSink::configure(const libcamera::CameraConfiguration &config)
+{
+ int ret = FrameSink::configure(config);
+ if (ret < 0)
+ return ret;
+
+ if (config.size() > 1) {
+ std::cerr
+ << "SDL sink only supports one camera stream at present, streaming first camera stream"
+ << std::endl;
+ } else if (config.empty()) {
+ std::cerr << "Require at least one camera stream to process"
+ << std::endl;
+ return -EINVAL;
+ }
+
+ const libcamera::StreamConfiguration &cfg = config.at(0);
+ rect_.w = cfg.size.width;
+ rect_.h = cfg.size.height;
+
+ switch (cfg.pixelFormat) {
+ case libcamera::formats::YUYV:
+ texture_ = std::make_unique<SDLTextureYUYV>(rect_);
+ break;
+ default:
+ std::cerr << "Unsupported pixel format "
+ << cfg.pixelFormat.toString() << std::endl;
+ return -EINVAL;
+ };
+
+ return 0;
+}
+
+int SDLSink::start()
+{
+ int ret = SDL_Init(SDL_INIT_VIDEO);
+ if (ret) {
+ std::cerr << "Failed to initialize SDL: " << SDL_GetError()
+ << std::endl;
+ return ret;
+ }
+
+ init_ = true;
+ window_ = SDL_CreateWindow("", SDL_WINDOWPOS_UNDEFINED,
+ SDL_WINDOWPOS_UNDEFINED, rect_.w,
+ rect_.h,
+ SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
+ if (!window_) {
+ std::cerr << "Failed to create SDL window: " << SDL_GetError()
+ << std::endl;
+ return -EINVAL;
+ }
+
+ renderer_ = SDL_CreateRenderer(window_, -1, 0);
+ if (!renderer_) {
+ std::cerr << "Failed to create SDL renderer: " << SDL_GetError()
+ << std::endl;
+ return -EINVAL;
+ }
+
+ /*
+ * Set for scaling purposes, not critical, don't return in case of
+ * error.
+ */
+ ret = SDL_RenderSetLogicalSize(renderer_, rect_.w, rect_.h);
+ if (ret)
+ std::cerr << "Failed to set SDL render logical size: "
+ << SDL_GetError() << std::endl;
+
+ ret = texture_->create(renderer_);
+ if (ret) {
+ return ret;
+ }
+
+ /* \todo Make the event cancellable to support stop/start cycles. */
+ EventLoop::instance()->addTimerEvent(
+ 10ms, std::bind(&SDLSink::processSDLEvents, this));
+
+ return 0;
+}
+
+int SDLSink::stop()
+{
+ texture_.reset();
+
+ if (renderer_) {
+ SDL_DestroyRenderer(renderer_);
+ renderer_ = nullptr;
+ }
+
+ if (window_) {
+ SDL_DestroyWindow(window_);
+ window_ = nullptr;
+ }
+
+ if (init_) {
+ SDL_Quit();
+ init_ = false;
+ }
+
+ return FrameSink::stop();
+}
+
+void SDLSink::mapBuffer(FrameBuffer *buffer)
+{
+ std::unique_ptr<Image> image =
+ Image::fromFrameBuffer(buffer, Image::MapMode::ReadOnly);
+ assert(image != nullptr);
+
+ mappedBuffers_[buffer] = std::move(image);
+}
+
+bool SDLSink::processRequest(Request *request)
+{
+ for (auto [stream, buffer] : request->buffers()) {
+ renderBuffer(buffer);
+ break; /* to be expanded to launch SDL window per buffer */
+ }
+
+ return true;
+}
+
+/*
+ * Process SDL events, required for things like window resize and quit button
+ */
+void SDLSink::processSDLEvents()
+{
+ for (SDL_Event e; SDL_PollEvent(&e);) {
+ if (e.type == SDL_QUIT) {
+ /* Click close icon then quit */
+ EventLoop::instance()->exit(0);
+ }
+ }
+}
+
+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];
+
+ 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;
+
+ texture_->update(data);
+
+ SDL_RenderClear(renderer_);
+ SDL_RenderCopy(renderer_, texture_->get(), nullptr, nullptr);
+ SDL_RenderPresent(renderer_);
+}