espressif/esp_new_jpeg

# ESP_NEW_JPEG ESP_NEW_JPEG is Espressif's lightweight JPEG encoder and decoder library. The memory and CPU loading are optimized to make better use of Espressif chips. ## Features ### Encoder - Support variety of width and height to encoder - Support RGB888 RGBA YCbYCr YCbY2YCrY2 GRAY pixel format - Support YUV444 YUV422 YUV420 subsampling - Support quality(1-100) - Support 0 90 180 270 degree clockwise rotation, under the follow cases 1. src_type = JPEG_PIXEL_FORMAT_YCbYCr, subsampling = JPEG_SUBSAMPLE_420 and width and height are multiply of 16 2. src_type = JPEG_PIXEL_FORMAT_YCbYCr, subsampling = JPEG_SUBSAMPLE_GRAY and width and height are multiply of 8 - Support mono-task and dual-task - Support two mode encoder, respectively one image encoder and block encoder ### Decoder - Support variety of width and height to decoder - Support one and three channels decoder - Support RGB888 RGB565(big endian) RGB565(little endian) CbYCrY pixel format output - Support 0 90 180 270 degree clockwise rotation, under width and height are multiply of 8 - Support clipper and scale, under width and height are multiply of 8 - Support two mode decoder, respectively one image decoder and block decoder ## Performance ### Test on chip ESP32-S3 #### Encoder For **mono task** encoder, the consume memory(10 kByte DRAM) is constant. | Resolution | Source Pixel Format | Output Quality | Output Subsampling | Frames Per Second(fps) | |-------------|--------------------------|----------------|--------------------|------------------------| | 1920 * 1080 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 1.59 | | 1920 * 1080 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 1.33 | | 1280 * 720 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 4.84 | | 1280 * 720 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 2.92 | | 800 * 480 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 10.82 | | 800 * 480 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 6.74 | | 640 * 480 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 13.24 | | 640 * 480 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 8.32 | | 480 * 320 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 24.35 | | 480 * 320 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 15.84 | | 320 * 240 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 45.30 | | 320 * 240 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 30.37 | When **dual task** encoder in enabled, the wider the image, the more memory is consumed. | Resolution | Source Pixel Format | Output Quality | Output Subsampling | Frames Per Second(fps) | |------------|--------------------------|----------------|--------------------|------------------------| | 1280 * 720 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 4.62 | | 800 * 480 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 10.46 | | 640 * 480 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 12.89 | | 480 * 320 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 23.57 | | 320 * 240 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 43.97 | #### Decoder The consume memory(10 kByte DRAM) is constant. Rotate JPEG_ROTATE_0D cases: | Resolution | Source Subsampling | Source Quality | Output Pixel Format | Frames Per Second(fps) | |-------------|--------------------|----------------|-----------------------------|------------------------| | 1920 * 1080 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 3.27 | | 1920 * 1080 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 3.78 | | 1280 * 720 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 6.77 | | 1280 * 720 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 7.82 | | 800 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 14.73 | | 800 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 16.87 | | 640 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 17.90 | | 640 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 20.46 | | 480 * 320 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 32.27 | | 480 * 320 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 36.29 | | 320 * 240 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 58.95 | | 320 * 240 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 66.28 | Rotate JPEG_ROTATE_90D cases: | Resolution | Source Subsampling | Source Quality | Output Pixel Format | Frames Per Second(fps) | |-------------|--------------------|----------------|-----------------------------|------------------------| | 1920 * 1080 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 2.23 | | 1920 * 1080 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 3.11 | | 1280 * 720 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 5.02 | | 1280 * 720 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 7.13 | | 800 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 14.09 | | 800 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 16.85 | | 640 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 17.16 | | 640 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 20.45 | | 480 * 320 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 30.87 | | 480 * 320 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 36.15 | | 320 * 240 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 59.17 | | 320 * 240 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 70.78 | ### Test on chip ESP32-S2 #### Encoder Only support mono task. The consume memory(10 kByte DRAM) is constant. | Resolution | Source Pixel Format | Output Quality | Output Subsampling | Frames Per Second(fps) | |------------|--------------------------|----------------|--------------------|------------------------| | 800 * 480 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 3.60 | | 800 * 480 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 2.76 | | 640 * 480 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 4.47 | | 640 * 480 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 3.43 | | 480 * 320 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 8.64 | | 480 * 320 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 6.69 | | 320 * 240 | JPEG_PIXEL_FORMAT_YCbYCr | 60 | JPEG_SUBSAMPLE_420 | 16.30 | | 320 * 240 | JPEG_PIXEL_FORMAT_RGB888 | 60 | JPEG_SUBSAMPLE_420 | 13.05 | #### Decoder The consume memory(10 kByte DRAM) is constant. Rotate JPEG_ROTATE_0D cases: | Resolution | Source Subsampling | Source Quality | Output Pixel Format | Frames Per Second(fps) | |------------|--------------------|----------------|-----------------------------|------------------------| | 800 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 5.44 | | 800 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 5.76 | | 640 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 6.70 | | 640 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 7.09 | | 480 * 320 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 12.71 | | 480 * 320 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 13.42 | | 320 * 240 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 24.18 | | 320 * 240 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 25.60 | Rotate JPEG_ROTATE_90D cases: | Resolution | Source Subsampling | Source Quality | Output Pixel Format | Frames Per Second(fps) | |------------|--------------------|----------------|-----------------------------|------------------------| | 800 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 4.53 | | 800 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 4.81 | | 640 * 480 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 5.59 | | 640 * 480 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 5.94 | | 480 * 320 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 10.69 | | 480 * 320 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 11.33 | | 320 * 240 | JPEG_SUBSAMPLE_422 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 22.40 | | 320 * 240 | JPEG_SUBSAMPLE_420 | 60 | JPEG_PIXEL_FORMAT_RGB565_LE | 21.77 | ## Usage Please refer to the `test_app` folder for more details on API usage. - `test_app/main/test_encoder.c` for encoder - Encode a single picture - Encode a single picture with block encoder API - `test_app/main/test_decoder.c` for decoder - Decode a single JPEG picture - Decode a single JPEG picture with block deocder API - Decode JPEG stream of the same size ## FAQ 1. Does ESP_NEW_JPEG support decoding progressive JPEG? No, ESP_NEW_JPEG only support decoding baseline JPEG. You can use the following code to check if the image is progressive JPEG. Output 1 means progressive JPEG, 0 means baseline JPEG. ```bash python >>> from PIL import Image >>> Image.open("file_name.jpg").info.get('progressive', 0) ``` 2. Why does the decoded output image appear misaligned? The issue typically occurs when a few columns of the image on the far left or right side appear on the opposite side. If you are using the ESP32-S3, a possible cause is that the output buffer is not 16-byte aligned. Please use the `jpeg_calloc_align` function to allocate output buffer. 3. How can I use a simpler method to check if the encoder's output is correct? You can use the following code to directly print the output JPEG data. Copy the output data, paste it into a hex editor, and save it as a .jpg file. ```c for (int i = 0; i < out_len; i++) { printf("%02x", outbuf[i]); } printf("\n"); ``` ## Supported chip The following table shows the support of ESP_NEW_JPEG for Espressif SoCs. The "✔" means supported, and the "✖" means not supported. | Chip | v0.5.1 | |----------|----------| | ESP32 | ✔ | | ESP32-S2 | ✔ | | ESP32-S3 | ✔ | | ESP32-P4 | ✔ | | ESP32-C2 | ✔ | | ESP32-C3 | ✔ | | ESP32-C5 | ✔ | | ESP32-C6 | ✔ |

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