VideoToSequence sample (#373)

* videoToSequence sample initial commit

* add frame_num calculation when seeking

* update README

* addressed review comments

* added FlushAndReconfigure() to flush out frames with seek

utils/rocvideodecode/roc_video_dec.h

@@ -267,7 +267,14 @@ class RocVideoDecoder {
          * @return true : success
          * @return false : fail
          */
-        bool SetReconfigParams(ReconfigParams *p_reconfig_params);
+        bool SetReconfigParams(ReconfigParams *p_reconfig_params, bool b_force_reconfig_flush = false);
+        
+        /**
+         * @brief Function to force Reconfigure Flush: needed for random seeking to key frames
+         * 
+         * @return int 1: Success 0: Fail
+         */
+        int FlushAndReconfigure();
         /**
          * @brief this function decodes a frame and returns the number of frames avalable for display
          * 
@@ -451,6 +458,7 @@ class RocVideoDecoder {
         bool b_force_zero_latency_ = false;
         uint32_t disp_delay_;
         ReconfigParams *p_reconfig_params_ = nullptr;
+        bool b_force_recofig_flush_ = false;
         int32_t num_frames_flushed_during_reconfig_ = 0;
         hipDeviceProp_t hip_dev_prop_;
         hipStream_t hip_stream_;
@@ -459,6 +467,7 @@ class RocVideoDecoder {
         rocDecVideoSurfaceFormat video_surface_format_ = rocDecVideoSurfaceFormat_NV12;
         RocdecSeiMessageInfo *curr_sei_message_ptr_ = nullptr;
         RocdecSeiMessageInfo sei_message_display_q_[MAX_FRAME_NUM];
+        RocdecVideoFormat *curr_video_format_ptr_ = nullptr;
         int decoded_frame_cnt_ = 0, decoded_frame_cnt_ret_ = 0;
         int decode_poc_ = 0, pic_num_in_dec_order_[MAX_FRAME_NUM];
         int num_alloced_frames_ = 0;