Linux/AM5728: Reducing MPU load in H.264 encode

Lawrence Wong

Part Number: AM5728

Tool/software: Linux

Follow up to https://e2e.ti.com/support/arm/sitara_arm/f/791/p/649297/2388747#2388747

Customer performing video transcode to H264 on AM57x and they are trying to reduce CPU consumption/loading to achieve this.

They are using ion heap to get incoming data from HDMI/videoShare.

So they already have contiguous physical address.

Is there any way to use this allocated contiguous physical address w/o any memory copy?(memcpy/dma buffer transfer)

Currently, they do following memcpy to allocated ybuff and uvbuff, but it consumes a lot of CPU overhead.

memcpy((char *)dceEncObj->buf.ybuff, inFrameObj->buff, (videoEnc->vidWidth * videoEnc->vidHeight));<

memcpy((char *)dceEncObj->buf.uvbuff, &inFrameObj->buff[videoEnc->vidWidth * videoEnc->vidHeight],<

over 7 years ago

0 Margarita Gashova over 7 years ago

TI__Guru* 80190 points

Hello Lawrence Wong,

What is the PSDK version that they are using?

What the are using gstreamer or modified videnc2test demo?

There is no memcpy required if dmabuf-fd is used.

Gstreamer does not use memcpy.

Videnc2test also doesn’t use any memcpy to copy the YUV data to encoder’s input buffer. Since this application is file based, it reads YUV data from file.

Please provide more details about the use case.

Margarita

0 Lawrence Wong over 7 years ago in reply to Margarita Gashova

TI__Genius 16250 points

Hello Margarita,

Customer is using PSDK 02.00.01. I will see if they can upgrade if needed.

They have implemented their own custom software based on the videnc2test source code. They have Incoming data(HDMI, Decoding YUV image) can be passed through by ion heap.

So they would like to use existing allocated physical/virtual address info to remove memcpy overhead. How can they use dmabuf-fd?

Regards,

Lawrence

0 Margarita Gashova over 7 years ago in reply to Lawrence Wong

TI__Guru* 80190 points

Hello Lawrence,

This is very old release.
The latest release is 5.0:
software-dl.ti.com/.../index_FDS.html
Please provide details about full use case(full chain).

BR
Margarita

0 Lawrence Wong over 7 years ago in reply to Margarita Gashova

TI__Genius 16250 points

Margarita,

Just to clarify when you said provide details about full use case (full chain) you are looking for the full sequence of commands and arguments used for their application?

Regards,

Lawrence

0 Margarita Gashova over 7 years ago in reply to Lawrence Wong

TI__Guru* 80190 points

Hello Lawrence,

I meant the use case like capture(v4l2)->encode->save in file.

BR
Margarita

0 Margarita Gashova over 7 years ago in reply to Margarita Gashova

TI__Guru* 80190 points

Hello Lawrence,

I am closing the thread here.

BR
Margarita

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Linux/AM5728: Reducing MPU load in H.264 encode