How to read JPG image from sd card using zynq 7030?

Hello,

We are developing demo Application for Picture in picture. for this we are using PicoZed 7030 board with FMC HDMI daughter card. We are referring FMC-HDMI-CAM + PYTHON-1300-C Reference Design Tutorial from zedboard.org. In this project Video On-Screen Display (OSD) Ip produces output video from external video sources (i.e HDMI,Camera input) and internal graphics controller.

In Vivado we used Axi vdma to read image from sd card . Inside Sd card we have used .bin file which is converted from .jpg image.

Following is the snippet of block design.

But we are not getting proper result over display.

We are not sure about which image format to place in Sd card to get proper result over the display. Is there any thing we are missing?

Thanks in advance

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clem57 over 6 years ago

shantaramj Why did you convert the JPEG to a bin format?
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clem57 over 6 years ago

shantaramj Why did you convert the JPEG to a bin format?
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shantaramj over 6 years ago in reply to clem57

Thanks for prompt reply,

We want to read image from sdcard and display using osd layer. we are using following chain

SDCARD --> AXI VDMA(24bit data width) ---> RGB2YCBCR(video_in 24bit) ----> CHROMA resampler(YCbCr444 to Ycbcr 422)----> OSD layer( video format yuv422) ---> HDMI OUT

We are using bare Metal application Over Zynq to Read from SD Card. RGB values for a picture (.bin format) are stored in SDcard. Any clue here to read .jpg/.bmp/.png image from sd card using baremetal application.
Any input ref. document here..!
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clem57 over 6 years ago in reply to shantaramj
Take a look at this https://opencores.org/projects/sdcard_mass_storage_controller. There are two method being employed:
full feature using DMA. This is very little usage from a CPU perspective. The down side is more hardware resource.
PIO method. Less resources for hardware, but more involvement with CPU.
I assume using VDMA is like the first example. If this is your troubles, the second method may be simpler to implement.
The next part is how to interpret the data. Get a seat beat because the fun begins. Look at JPEG File Layout and Format. If huffman tables are
not your thing, look at https://www.lifewire.com/jpg-jpeg-file-4139913 for overview. Maybe searching around, you can locate code to assist because
trying on your own is another crazy journey.
Hope this helps,
Clem
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shantaramj over 6 years ago in reply to clem57

Thanks for reply
We are using zynq 7030 SoC. sdcard is being access using baremetal application running on zynq ARM.
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