add support to passthough mjpeg images

image.h

@@ -6,16 +6,39 @@
 
 class Image 
 {
+private:
+
+    ssize_t bufferSize = -1;
+
 public:
+
+    enum {
+        FORMAT_RGB,
+        FORMAT_JPEG,
+        FORMAT_YUYV
+    } typedef format_t;
+
     std::shared_ptr<unsigned char> data = nullptr;
     uint32_t width;
     uint32_t height;
     uint8_t channels;
-    const uint32_t size()
+    format_t format = FORMAT_RGB;
+
+    const size_t size() const
     {
-        return width*height*channels;
+        return bufferSize < 0 ? width*height*channels : bufferSize;
     }
-    void save(const char* filename)
+    void setSize(size_t size)
+    {
+        bufferSize = size;
+    }
+    void setBuffer(std::shared_ptr<unsigned char> buffer, size_t size, format_t inFormat = FORMAT_RGB)
+    {
+        data = buffer;
+        bufferSize = size;
+        format = inFormat;
+    }
+    void save(const char* filename) const
     {
         std::ofstream outfile(filename);
         outfile.write((char *) data.get(), size());