esp-idf/examples/peripherals/jpeg/jpeg_decode

Supported Targets	ESP32-P4

JPEG decode example

Overview

This example demonstrates how to use the JPEG hardware decoder to decode a 1080p and a 720p picture:

If you have a bunch of big JPEG picture need to be decoded, such as *.jpg -> *.rgb, and this example uses hardware JPEG decoder to accelerate the decoding.

How to use example

Prerequisites Required

This example demonstrates the flexibility of decoding pictures by decoding two different sizes: one in 1080p and another in 720p. It showcases how you can easily modify the code to meet your specific requirements, such as only decoding 1080p photos.

Build and Flash

Before you start build and flash this example, please put the image esp720.jpg and esp1080.jpg in your sdcard.

Enter idf.py -p PORT flash monitor to build, flash and monitor the project.

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

I (1116) jpeg.example: Initializing SD card
I (1116) gpio: GPIO[43]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (1126) gpio: GPIO[44]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (1136) gpio: GPIO[39]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (1146) gpio: GPIO[40]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (1156) gpio: GPIO[41]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
I (1166) gpio: GPIO[42]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 
I (1416) gpio: GPIO[42]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0 
Name: SD64G
Type: SDHC/SDXC
Speed: 40.00 MHz (limit: 40.00 MHz)
Size: 60906MB
CSD: ver=2, sector_size=512, capacity=124735488 read_bl_len=9
SSR: bus_width=4
I (1436) jpeg.example: jpg_file_1080:/sdcard/esp1080.jpg
I (1696) jpeg.example: jpg_file_1080:/sdcard/esp720.jpg
I (1796) jpeg.example: header parsed, width is 1920, height is 1080
I (1846) jpeg.example: raw_file_1080:/sdcard/out.rgb
I (11836) jpeg.example: raw_file_720:/sdcard/out2.rgb
I (13336) jpeg.example: Card unmounted
I (13336) main_task: Returned from app_main()

Also, the helper script open_raw_picture.py simplifies the visualization of the output on your computer. For this to work, go to examples/peripheral/jpeg/jpeg_decode and install the requirements by running pip install -r requirements.txt.

Troubleshooting

(For any technical queries, please open an issue on GitHub. We will get back to you as soon as possible.)