Implement class audio/video metadata fetch using libav.

avdecoder.h

@@ -0,0 +1,32 @@
+#ifndef AVDECODER_H
+#define AVDECODER_H
+
+#include <QImage>
+#include <QString>
+
+extern "C" {
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libswscale/swscale.h>
+#include <vitamtp.h>
+}
+
+class AVDecoder
+{
+public:
+    AVDecoder();
+    bool open(const QString filename);
+    QByteArray getAudioThumbnail(int width, int height);
+    QByteArray getVideoThumbnail(int width, int height);
+    void getAudioMetadata(metadata_t &metadata);
+    void getVideoMetadata(metadata_t &metadata);
+    void close();
+
+private:
+    void AVFrameToQImage(AVFrame &frame, QImage &image, int width, int height);
+    AVFrame *getDecodedFrame(AVCodecContext *pCodecCtx, int stream_index);
+
+    AVFormatContext *pFormatCtx;
+};
+
+#endif // AVDECODER_H