kopia lustrzana https://github.com/espressif/esp-idf
58 wiersze
2.7 KiB
Markdown
58 wiersze
2.7 KiB
Markdown
| Supported Targets | ESP32-P4 |
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| ----------------- | -------- |
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# JPEG decode example
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## Overview
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This example demonstrates how to use the JPEG hardware decoder to decode a 1080p and a 720p picture:
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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.
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## How to use example
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### Prerequisites Required
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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.
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### Build and Flash
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Before you start build and flash this example, please put the image `esp720.jpg` and `esp1080.jpg` in your sdcard.
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Enter `idf.py -p PORT flash monitor` to build, flash and monitor the project.
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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```bash
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I (1116) jpeg.example: Initializing SD card
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I (1116) gpio: GPIO[43]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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I (1126) gpio: GPIO[44]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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I (1136) gpio: GPIO[39]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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I (1146) gpio: GPIO[40]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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I (1156) gpio: GPIO[41]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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I (1166) gpio: GPIO[42]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
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I (1416) gpio: GPIO[42]| InputEn: 0| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:0
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Name: SD64G
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Type: SDHC/SDXC
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Speed: 40.00 MHz (limit: 40.00 MHz)
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Size: 60906MB
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CSD: ver=2, sector_size=512, capacity=124735488 read_bl_len=9
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SSR: bus_width=4
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I (1436) jpeg.example: jpg_file_1080:/sdcard/esp1080.jpg
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I (1696) jpeg.example: jpg_file_1080:/sdcard/esp720.jpg
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I (1796) jpeg.example: header parsed, width is 1920, height is 1080
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I (1846) jpeg.example: raw_file_1080:/sdcard/out.rgb
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I (11836) jpeg.example: raw_file_720:/sdcard/out2.rgb
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I (13336) jpeg.example: Card unmounted
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I (13336) main_task: Returned from app_main()
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```
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Moreover, we provided a helper script called `open_rgb.py`, which can help you easily see the outputs on your computer. For requirements component you need, you can call `pip install -r requirements.txt` under `examples/peripheral/jpeg/jpeg_decode` folder.
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## Troubleshooting
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(For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you as soon as possible.) |