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156 lines
5.2 KiB
156 lines
5.2 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#ifndef JPEG_H |
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#define JPEG_H 1 |
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/* |
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* Insert a JPEG header at start of frame |
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* |
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* This module is used by the gspca subdrivers. |
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* A special case is done for Conexant webcams. |
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* |
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* Copyright (C) Jean-Francois Moine (http://moinejf.free.fr) |
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*/ |
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/* |
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* generation options |
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* CONEX_CAM Conexant if present |
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*/ |
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/* JPEG header */ |
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static const u8 jpeg_head[] = { |
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0xff, 0xd8, /* jpeg */ |
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/* quantization table quality 50% */ |
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0xff, 0xdb, 0x00, 0x84, /* DQT */ |
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0, |
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#define JPEG_QT0_OFFSET 7 |
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0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e, |
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0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28, |
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0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25, |
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0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33, |
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0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44, |
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0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57, |
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0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71, |
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0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63, |
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1, |
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#define JPEG_QT1_OFFSET 72 |
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0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a, |
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0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63, |
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, |
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, |
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, |
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, |
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, |
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0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, |
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/* huffman table */ |
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0xff, 0xc4, 0x01, 0xa2, |
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0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, |
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0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, |
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03, |
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, |
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0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, |
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0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, |
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0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, |
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0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, |
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0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04, |
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0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, |
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0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, |
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0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15, |
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0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, |
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0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, |
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0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, |
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0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, |
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0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, |
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0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, |
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0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, |
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0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, |
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0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, |
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0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, |
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0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, |
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0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, |
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0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, |
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0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, |
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0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, |
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0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, |
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0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02, |
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0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, |
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0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, |
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0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, |
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0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, |
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0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1, |
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0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, |
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0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, |
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0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, |
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0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, |
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0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, |
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0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, |
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0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, |
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0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, |
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0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, |
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, |
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, |
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, |
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0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, |
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0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, |
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#ifdef CONEX_CAM |
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/* the Conexant frames start with SOF0 */ |
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#define JPEG_HDR_SZ 556 |
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#else |
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0xff, 0xc0, 0x00, 0x11, /* SOF0 (start of frame 0 */ |
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0x08, /* data precision */ |
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#define JPEG_HEIGHT_OFFSET 561 |
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0x01, 0xe0, /* height */ |
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0x02, 0x80, /* width */ |
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0x03, /* component number */ |
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0x01, |
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0x21, /* samples Y */ |
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0x00, /* quant Y */ |
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0x02, 0x11, 0x01, /* samples CbCr - quant CbCr */ |
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0x03, 0x11, 0x01, |
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0xff, 0xda, 0x00, 0x0c, /* SOS (start of scan) */ |
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0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00 |
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#define JPEG_HDR_SZ 589 |
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#endif |
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}; |
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/* define the JPEG header */ |
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static void jpeg_define(u8 *jpeg_hdr, |
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int height, |
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int width, |
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int samplesY) |
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{ |
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memcpy(jpeg_hdr, jpeg_head, sizeof jpeg_head); |
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#ifndef CONEX_CAM |
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 0] = height >> 8; |
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 1] = height; |
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 2] = width >> 8; |
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 3] = width; |
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jpeg_hdr[JPEG_HEIGHT_OFFSET + 6] = samplesY; |
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#endif |
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} |
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/* set the JPEG quality */ |
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static void jpeg_set_qual(u8 *jpeg_hdr, |
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int quality) |
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{ |
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int i, sc; |
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if (quality <= 0) |
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sc = 5000; |
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else if (quality < 50) |
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sc = 5000 / quality; |
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else |
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sc = 200 - quality * 2; |
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for (i = 0; i < 64; i++) { |
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jpeg_hdr[JPEG_QT0_OFFSET + i] = |
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(jpeg_head[JPEG_QT0_OFFSET + i] * sc + 50) / 100; |
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jpeg_hdr[JPEG_QT1_OFFSET + i] = |
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(jpeg_head[JPEG_QT1_OFFSET + i] * sc + 50) / 100; |
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} |
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} |
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#endif
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