i.MX ProcessorsのトピックRe: IMX8MP and accellerated jpeg decoder

IMX8MP and accellerated jpeg decoder

stefanop — Wed, 27 Oct 2021 10:21:19 GMT

Hi,

I'm working with and IMX8MP I need to decompress a motion jpeg video stream.

I'm using Yocto gatesgarth and the libimxvpuapi2 version v2.1.0.

To test the decoder I tried to launch the code example jpeg-dec-example contained in the libimxvpuapi2 but i recevied the followoing error

OMX JPEG ! HantroHwDecOmx_decoder_create_jpeg JpegDecInit error openmax_il/source/decoder/codec_jpeg.c:1045 ../git/imxvpuapi2/imxvpuapi2_imx8m_hantro_decoder.c:1372 (imx_vpu_api_dec_open) ERROR: could not create codec ../git/imxvpuapi2/imxvpuapi2_jpeg.c:200 (imx_vpu_api_jpeg_dec_open) ERROR: could not open JPEG decoder: error could not open VPU JPEG decoder ../git/imxvpuapi2/imxvpuapi2_imx8m_hantro_decoder.c:1410 (imx_vpu_api_dec_close) debug: closing decoder Segmentation fault

My question is: The VPU of the IMX8MP processor is able to do an hardware accelerated decoding of jpeg images?

Thanks in advance.

Re: IMX8MP and accellerated jpeg decoder

Bio_TICFSL — Wed, 27 Oct 2021 13:29:48 GMT

Hello stefanop, you can use the same vpu encode api as mpeg4/h.264 to encode mjpeg, just set different format.

mxc_vpu_test is open source, suppose you can get the source from our formal release.

The only work you need to do is adjust the memory pool to allow large memory allocation and set proper value for 'VPU_ENC_BITS_BUF_SIZE' accordingly just like mentioned above.

For the libimxvpuapi, it was developed by third-party, you can ask help in this community

or you can get NXP formal release package from BSP NXP offical site.

Regards

Re: IMX8MP and accellerated jpeg decoder

stefanop — Wed, 27 Oct 2021 14:01:36 GMT

Thanks for your reply, only one more clarification:

I see your speaking about encode functions but I need to decode an mjpeg stream.

It is possible to use the same VPU APIs used for decoding mpeg4/h.264 to decode also a jpeg image?

Thanks

Re: IMX8MP and accellerated jpeg decoder

Bio_TICFSL — Thu, 28 Oct 2021 12:24:16 GMT

Yes it can be used.