bufferclass_ti changing physical address fail on DM8168 DVR

Alexey Cheremisinov

Hi all ~

I am trying to use bufferclass_ti (bc_cat) to streaming multichannel video on DM8168 DVR.

It works only if all physical addresses of frames are set before render start.

After that - if any changes of physical address at bc_cat buffer were provided - no error return but bc_cat buffer used old physical address. That is wrong and I do not know how to use new physical address.

To understand situation, I have written some test code here: https://bitbucket.org/lolikandr/bccat_addr_test

There is a lot of initialization there but the most important tests are small and they are in main() function with comments (at the end of file "main.c").

Please, help!

over 11 years ago

0 Alexey Cheremisinov over 11 years ago

Prodigy 90 points

To be more precisely: BCIOSET_BUFFERPHYADDR does not work after first render done.

0 Alexey Cheremisinov over 11 years ago in reply to Alexey Cheremisinov

Prodigy 90 points

According http://processors.wiki.ti.com/index.php/OpenGLES_Texture_Streaming_-_bc-cat_User_Guide :

"BCIOSET_BUFFERPHYADDR - Register the external buffer as a texture buffer to a given index. This ioctl should be called before initialize the IMG extensions."

But DM8168 DVR has video decoder that change allocating frames when resolution of stream changed. So when we are going to start decoding new stream - we should deinitialise IMG extension, do set physical addresses and initialize IMG extension.

So the main question is "how to correct deinitialize IMG extension and initialize it back".

0 Alexey Cheremisinov over 11 years ago in reply to Alexey Cheremisinov

Prodigy 90 points

For additional question "how to correct deinitialize IMG extension and initialize it back" I have made another post: http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/304966.aspx

This question is still open.

Hot to provide physical address changing with only BCIOSET_BUFFERPHYADDR without OpenGL context destroying? Any ideas?

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bufferclass_ti changing physical address fail on DM8168 DVR