work on decoder classes

decoders/frame.cpp

@@ -1,6 +1,79 @@
-#include "frame.h"
-
-Frame::Frame()
-{
-
-}
+#include "frame.h"
+
+Frame::Frame() :
+  frame_(nullptr)
+{
+}
+
+Frame::Frame(AVFrame *f) :
+  frame_(f)
+{
+}
+
+Frame::Frame(const Frame &f) :
+  frame_(nullptr)
+{
+}
+
+Frame::Frame(Frame &&f) :
+  frame_(f.frame_)
+{
+  f.frame_ = nullptr;
+}
+
+Frame &Frame::operator=(const Frame &f)
+{
+  frame_ = nullptr;
+  return *this;
+}
+
+Frame &Frame::operator=(Frame &&f)
+{
+  if (&f != this) {
+    frame_ = f.frame_;
+    f.frame_ = nullptr;
+  }
+
+  return *this;
+}
+
+Frame::~Frame()
+{
+  FreeChild();
+}
+
+void Frame::SetAVFrame(AVFrame *f, AVRational timebase)
+{
+  FreeChild();
+
+  f = frame_;
+  timestamp_ = rational(timebase.num*f->pts, timebase.den);
+}
+
+const int &Frame::width()
+{
+  return frame_->width;
+}
+
+const int &Frame::height()
+{
+  return frame_->height;
+}
+
+const rational &Frame::timestamp()
+{
+  return timestamp_;
+}
+
+const int &Frame::format()
+{
+  return frame_->format;
+}
+
+void Frame::FreeChild()
+{
+  if (frame_ != nullptr) {
+    av_frame_free(&frame_);
+    frame_ = nullptr;
+  }
+}