Image* Frame::GetImage(int width, int height,
VideoMode::PixelFormat pixelFormat, int jpegQuality) {
if (!m_impl) return nullptr;
std::lock_guard<wpi::recursive_mutex> lock(m_impl->mutex);
Image* cur = GetNearestImage(width, height, pixelFormat);
if (!cur || cur->Is(width, height, pixelFormat)) return cur;
DEBUG4("converting image from "
<< cur->width << "x" << cur->height << " type " << cur->pixelFormat
<< " to " << width << "x" << height << " type " << pixelFormat);
// If the source image is a JPEG, we need to decode it before we can do
// anything else with it. Note that if the destination format is JPEG, we
// still need to do this (unless the width/height were the same, in which
// case we already returned the existing JPEG above).
if (cur->pixelFormat == VideoMode::kMJPEG) cur = ConvertMJPEGToBGR(cur);
// Resize
if (!cur->Is(width, height)) {
// Allocate an image.
auto newImage = m_impl->source.AllocImage(
cur->pixelFormat, width, height,
width * height * (cur->size() / (cur->width * cur->height)));
// Resize
cv::Mat newMat = newImage->AsMat();
cv::resize(cur->AsMat(), newMat, newMat.size(), 0, 0);
// Save the result
cur = newImage.release();
m_impl->images.push_back(cur);
}
// Convert to output format
return Convert(cur, pixelFormat, jpegQuality);
}
bool Frame::GetCv(cv::Mat& image, int width, int height) {
Image* rawImage = GetImage(width, height, VideoMode::kBGR);
if (!rawImage) return false;
rawImage->AsMat().copyTo(image);
return true;
}