drivers/media/usb/gspca/jpeg.h

Source file repositories/reference/linux-study-clean/drivers/media/usb/gspca/jpeg.h

File Facts

System: Linux kernel
Corpus path: drivers/media/usb/gspca/jpeg.h
Extension: .h
Size: 5362 bytes
Lines: 157
Domain: Driver Families
Bucket: drivers/media
Inferred role: Driver Families: implementation source
Status: source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

No C-style include directives detected by the generator.

Detected Declarations

function jpeg_define
function jpeg_set_qual

Annotated Snippet

#ifndef JPEG_H
#define JPEG_H 1
/*
 * Insert a JPEG header at start of frame
 *
 * This module is used by the gspca subdrivers.
 * A special case is done for Conexant webcams.
 *
 * Copyright (C) Jean-Francois Moine (http://moinejf.free.fr)
 */

/*
 * generation options
 *	CONEX_CAM	Conexant if present
 */

/* JPEG header */
static const u8 jpeg_head[] = {
	0xff, 0xd8,			/* jpeg */

/* quantization table quality 50% */
	0xff, 0xdb, 0x00, 0x84,		/* DQT */
0,
#define JPEG_QT0_OFFSET 7
	0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e,
	0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28,
	0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
	0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33,
	0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44,
	0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57,
	0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71,
	0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63,
1,
#define JPEG_QT1_OFFSET 72
	0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a,
	0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,

/* huffman table */
	0xff, 0xc4, 0x01, 0xa2,
	0x00, 0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
	0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
	0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03,
	0x02, 0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00,
	0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04,
	0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13,
	0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81,
	0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15,
	0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82,
	0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25,
	0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36,
	0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46,
	0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56,
	0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66,
	0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
	0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86,
	0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95,
	0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4,
	0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3,
	0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2,
	0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca,
	0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9,
	0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
	0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5,
	0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02,
	0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05,
	0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01,
	0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06,
	0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22,
	0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1,
	0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62,
	0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25,
	0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28,
	0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
	0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
	0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
	0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
	0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
	0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
	0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,

Annotation

Detected declarations: `function jpeg_define`, `function jpeg_set_qual`.
Atlas domain: Driver Families / drivers/media.
Implementation status: source implementation candidate.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.