1 files changed, 104 insertions, 0 deletions
diff --git a/video-opencv/impl-camera.cpp b/video-opencv/impl-camera.cpp
new file mode 100644
index 00000000..96081399
--- /dev/null
+++ b/video-opencv/impl-camera.cpp
@@ -0,0 +1,104 @@
+#include "impl.hpp"
+#include "compat/sleep.hpp"
+#include "video-property-page.hpp"
+#include <opencv2/core/utils/logger.hpp>
+
+namespace opencv_camera_impl {
+
+cam::cam(int idx) : idx(idx)
+{
+}
+
+cam::~cam()
+{
+    stop();
+}
+
+void cam::stop()
+{
+    if (cap)
+    {
+        if (cap->isOpened())
+            cap->release();
+        cap = std::nullopt;
+    }
+    mat = cv::Mat();
+    frame_ = { {}, false };
+}
+
+bool cam::is_open()
+{
+    return !!cap;
+}
+
+bool cam::start(info& args)
+{
+    stop();
+    cv::utils::logging::setLogLevel(cv::utils::logging::LogLevel::LOG_LEVEL_WARNING);
+    cap.emplace(idx, video_capture_backend);
+
+    if (args.width > 0 && args.height > 0)
+    {
+        cap->set(cv::CAP_PROP_FRAME_WIDTH,  args.width);
+        cap->set(cv::CAP_PROP_FRAME_HEIGHT, args.height);
+    }
+    if (args.fps > 0)
+        cap->set(cv::CAP_PROP_FPS, args.fps);
+
+    if (args.use_mjpeg)
+        cap->set(cv::CAP_PROP_FOURCC, cv::VideoWriter::fourcc('M', 'J', 'P', 'G'));
+
+    if (!cap->isOpened())
+        goto fail;
+
+    if (!get_frame_())
+        goto fail;
+
+    return true;
+
+fail:
+    stop();
+    return false;
+}
+
+bool cam::get_frame_()
+{
+    if (!is_open())
+        return false;
+
+    for (unsigned i = 0; i < 10; i++)
+    {
+        if (cap->read(mat))
+        {
+            frame_.data = mat.data;
+            frame_.width = mat.cols;
+            frame_.height = mat.rows;
+            frame_.stride = mat.step.p[0];
+            if (mat.step.p[0] == (unsigned)frame_.width * mat.elemSize())
+                frame_.stride = cv::Mat::AUTO_STEP;
+
+            frame_.channels = mat.channels();
+
+            return true;
+        }
+        portable::sleep(50);
+    }
+
+    return false;
+}
+
+std::tuple<const frame&, bool> cam::get_frame()
+{
+    bool ret = get_frame_();
+    return { frame_, ret };
+}
+
+bool cam::show_dialog()
+{
+    if (is_open())
+        return video_property_page::show_from_capture(*cap, idx);
+    else
+        return video_property_page::show(idx);
+}
+
+} // ns opencv_camera_impl