1.VTC:

   Get the arguments from the user

   each VOL is stored in a separate bitstream

2. Allocate memory

   Allocate memory for the display_vop which is used for composition purposes

程式碼說明:

留下記憶體給VOP

   display_vop =AllocVop(display_width,display_height,0);

安排給VOP每一個像素多少位元

   PutVopBitsPerPixel(bits_per_pixel, display_vop);

3. Calculate the time between two frames to be displayed in ms

4. Trace capabilities

   The settings by the users should be done at the top of this file!

   Please DO NOT MODIFY any values below here !

   這部分的程式碼有

   Level 1 data

   Level 2 data

   Level 3 data

   這些分別描述影像的YUV

5. Initializations

   Random access

   Scalability

   SA-IDCT

6. decode

   Process all bitstreams in parallel,

   decode each VOL of each VO and compose  

   then the respective image to be displayed out

   Then again decode each VOL of each VO up to the next display time etc.

7. Freeing of display_vop, VOLs, bitstream  structures  and trace files

                                圖4.3 MPEG4 decoder 的流程圖

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