A high efficiency 0-delay 0-copy QT player scheme based on Hisilicon 3559

Haisi has very good mpp SDK, Play video stream , Can quickly from VDEC（ decode ） To VO( Show ), But when we UI When the requirements are complex , It requires many operation interfaces , Like fast forward , back off , For example, adjust the position of the camera , These are complicated UI function , We can think of using qt Implementation of open source platform , But if the video is qt How to play on the interface ？VO It cannot be embedded into qt Of . I have the following plan ：

One , Compile support opengl Of qt, use opengl Rendering Decoded yuv perhaps rgb data . There's a problem here ,qt Only the virtual address of the decoder can be accessed , Read data from virtual address yuv perhaps rgb It's very slow . The test found that although 3559 Can decode 8k video , But read data with virtual address , Read 1080 Of yuv perhaps rgb One frame of data , need 45 millisecond . It's very time consuming . This scheme can also meet the playback requirements with low resolution . But the scheme with higher resolution and frame rate cannot be satisfied . So there's a plan 2.

Two , Option two , We can not get from the virtual address yuv data , We directly use the physical address to convert to opengl The texture of .

     1,eglCreateImageKHR Create a physical address egl Images . I understand that it should be a mapping of the physical address of the image .

2,glEGLImageTargetTexture2DOES , amount to glTexImage2D Function function , Paste the image onto the texture .

In the process of implementation , Pay special attention to Hess eglCreateImageKHR Only support rgba The format of .Demo Inside About yuv I can't run at all .

Plan 1 ：

    Scheme II diagram ：