jpeghead.c 29.2 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
/** @file jpeghead.c
 *
 * @brief This file contains methods for JPEG tables and headers generation and
 * JPEG files composition from data compressed by FPGA.
 *
 * Copyright (C) 2016 Elphel, Inc
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
Mikhail Karpenko's avatar
Mikhail Karpenko committed
20 21
*/

22
//#include <linux/module.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
23
#include <linux/mm.h>
24
//#include <linux/sched.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
25
#include <linux/slab.h>
26
//#include <linux/errno.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
27 28
#include <linux/kernel.h>
#include <linux/fs.h>
29
//#include <linux/string.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
30 31
#include <linux/init.h>
//#include <linux/autoconf.h>
32
//#include <linux/time.h>
33 34
//#include <linux/device.h>
#include <linux/platform_device.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
35 36 37 38

//#include <asm/system.h>
//#include <asm/arch/memmap.h>
//#include <asm/svinto.h> obsolete
39
//#include <asm/io.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
40 41 42 43 44 45 46 47

/*#include <asm/arch/dma.h>
#include <asm/arch/hwregs/dma_defs.h>
#include <asm/arch/hwregs/dma.h>
#include <asm/arch/hwregs/reg_map.h>
#include <asm/arch/hwregs/bif_dma_defs.h>
*/

48 49
//#include <asm/irq.h>
//#include <asm/atomic.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
50 51


52
//#include <asm/delay.h>
Mikhail Karpenko's avatar
Mikhail Karpenko committed
53 54 55 56 57 58 59 60 61 62
#include <asm/uaccess.h>
#include <elphel/c313a.h>
//#include "fpga_io.h"//fpga_table_write_nice
#include "jpeghead.h"
//#include "fpgactrl.h"  // defines port_csp0_addr, port_csp4_addr
#include "framepars.h" // extern pastpars
#include "quantization_tables.h" // get_gtables()
//#include "x3x3.h"
//#include "cc3x3.h"
//#include "cxdma.h"
63 64
//#include "circbuf.h"
//#include "sensor_common.h"
65
//#include "exif.h"
66
#include "x393_macro.h"
67
#include "x393.h"
Mikhail Karpenko's avatar
Mikhail Karpenko committed
68

69
static struct device *g_dev_ptr = NULL;
70

71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
/**
 * @brief All Huffman tables data to be read/written from the application
 */
struct huff_tables_t {
	struct huffman_encoded_t header_huffman_tables[4];
	unsigned long            fpga_huffman_table[512];
	union {
		unsigned char        dht_all[20];
		struct {
			unsigned char    dht_dc0[5]; /// DHT DC0 header (all constants but the length)
			unsigned char    dht_ac0[5]; /// DHT AC0 header (all constants but the length)
			unsigned char    dht_dc1[5]; /// DHT DC1 header (all constants but the length)
			unsigned char    dht_ac1[5]; /// DHT AC1 header (all constants but the length)
		};
	};
}/* huff_tables */;

static struct jpeghead_priv_t {
	struct huff_tables_t     huff_tables;
	unsigned int             fpga_programmed;
	unsigned long            jpeg_h_sz;  /// JPEG header size (no Exif)
	unsigned char            header[JPEG_HEADER_MAXSIZE];
} jpeghead_priv[IMAGE_CHN_NUM];

#define HEADER_COPY_SOF(x) {buf[bpl] = sizeof( x ) + 8; \
                            buf[bp++] = sizeof( x ) / 3; \
Mikhail Karpenko's avatar
Mikhail Karpenko committed
97
                            memcpy((void *) &buf[bp], (void *) ( x ), sizeof ( x )); \
98 99 100
                            bp += sizeof( x );}
#define HEADER_COPY_SOS(x) {buf[bp++] = sizeof( x ) + 6; \
                            buf[bp++] = sizeof( x ) / 2; \
Mikhail Karpenko's avatar
Mikhail Karpenko committed
101
                            memcpy((void *) &buf[bp], (void *) ( x ), sizeof ( x )); \
102
                            bp += sizeof( x );}
Mikhail Karpenko's avatar
Mikhail Karpenko committed
103
/**
104 105 106
 * @brief Copy two quantization tables for the current frame (for the RTP streamer)
 * @param[in]   params   pointer to an array of parameters stored for the frame
 * @param[out]  buf      buffer to put the header to
107
 * @param[in]   chn      compressor channel number
108
 * @return      header length if successful, < 0 - error
Mikhail Karpenko's avatar
Mikhail Karpenko committed
109
 */
110
int qtables_create(struct interframe_params_t *params, unsigned char *buf, unsigned int chn)
111 112
{
	dev_dbg(g_dev_ptr, "params->quality2 = 0x%x\n", params->quality2);
113
	int rslt = get_qtable(params->quality2, &buf[0], &buf[64], chn); /// will copy both quantization tables
114 115
	if (rslt < 0) return rslt; /// bad quality table
	return 128;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
116
}
117

Mikhail Karpenko's avatar
Mikhail Karpenko committed
118
/**
119 120 121 122
 * @brief Create JPEG header for the frame acquired earlier
 * @param[in]   params   pointer to an array of parameters stored for the frame
 * @param[our]  buf      buffer to put the header to
 * @return      header length if successful, < 0 - error
Mikhail Karpenko's avatar
Mikhail Karpenko committed
123
 */
124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
int jpegheader_create(struct interframe_params_t *params, unsigned char *buf, unsigned int chn)
{
	int bp=0;   ///buffer pointer
	int bpl;    /// pointer to length word in the buffer
	int rslt;
	int len;
	int header_sos; /// start of SOS (variable)
	const int header_yqtable=    0x19;
	const int header_cqtable_hd= 0x59;
	const int header_cqtable=    0x5e;
	const int header_sof=        0x9e;
	/// first constant part of the header - 0x19 bytes
	const unsigned char jfif1[0x19]={0xff, 0xd8,                   /// SOI start of image
			0xff, 0xe0,                   /// APP0
			0x00, 0x10,                   /// (16 bytes long)
			0x4a, 0x46, 0x49, 0x46, 0x00, /// JFIF null terminated
			0x01, 0x01, 0x00, 0x00, 0x01,
			0x00, 0x01, 0x00, 0x00,
			0xff, 0xdb,                   /// DQT (define quantization table)
			0x00, 0x43,                   /// 0x43 bytes long
			0x00 };                       /// table number + (bytes-1)<<4 (0ne byte - 0, 2 bytes - 0x10)
	/// second constant part of the header (starting from byte 0x59 - 0x5 bytes)

	const unsigned char jfif2[0x5]= {0xff, 0xdb,                   /// DQT (define quantization table)
			0x00, 0x43,                   /// 0x43 bytes long
			0x01 };                       /// table number + (bytes-1)<<4 (0ne byte - 0, 2 bytes - 0x10)

	const unsigned char sof_color6[]= {0x01, 0x22, 0x00, /// id , freqx/freqy, q
			0x02, 0x11, 0x01,
			0x03, 0x11, 0x01};
	const unsigned char sos_color6[]= {0x01, 0x00, /// id, hufftable_dc/htable_ac
			0x02, 0x11,
			0x03, 0x11};

	const unsigned char sof_jp46dc[]= {0x01, 0x11, 0x00, /// id , freqx/freqy, q
			0x02, 0x11, 0x00,
			0x03, 0x11, 0x00,
			0x04, 0x11, 0x00,
			0x05, 0x11, 0x01,
			0x06, 0x11, 0x01};
	const unsigned char sos_jp46dc[]= {0x01, 0x00, /// id, hufftable_dc/htable_ac
			0x02, 0x00,
			0x03, 0x00,
			0x04, 0x00,
			0x05, 0x11,
			0x06, 0x11};

	const unsigned char sof_mono4[]=  {0x01, 0x22, 0x00}; /// id , freqx/freqy, q
	const unsigned char sos_mono4[]=  {0x01, 0x00}; /// id, hufftable_dc/htable_ac

	const unsigned char sof_jp4[]=    {0x04, 0x22, 0x00}; /// id , freqx/freqy, q
	const unsigned char sos_jp4[]=    {0x04, 0x00}; /// id, hufftable_dc/htable_ac

	const unsigned char sof_jp4dc[]=  {0x04, 0x11, 0x00, /// id , freqx/freqy, q
			0x05, 0x11, 0x00,
			0x06, 0x11, 0x00,
			0x07, 0x11, 0x00};
	const unsigned char sos_jp4dc[]=  {0x04, 0x00, /// id, hufftable_dc/htable_ac
			0x05, 0x00,
			0x06, 0x00,
			0x07, 0x00};

	const unsigned char sof_jp4diff[]={0x04, 0x11, 0x11, /// will be adjusted to bayer shift, same for jp4hdr
			0x05, 0x11, 0x11,
			0x06, 0x11, 0x11,
			0x07, 0x11, 0x11};
	const unsigned char sos_jp4diff[]={0x04, 0x11, /// id, hufftable_dc/htable_ac
			0x05, 0x11,
			0x06, 0x11,
			0x07, 0x11};

	struct huff_tables_t *huff_tables = &jpeghead_priv[chn].huff_tables;
196
	unsigned char *p = (unsigned char *)params;
197 198 199 200 201 202 203 204

	if (buf==NULL) return -1; /// buffer is not provided

	dev_dbg(g_dev_ptr, "list of parameters:\n");
	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, p, 32);

	memcpy((void *) &buf[0],                 (void *) jfif1, sizeof (jfif1)); /// including DQT0 header
	memcpy((void *) &buf[header_cqtable_hd], (void *) jfif2, sizeof (jfif2)); /// DQT1 header
205
	rslt=get_qtable(params->quality2, &buf[header_yqtable], &buf[header_cqtable], chn); /// will copy both quantization tables
206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
	if (rslt <0) return rslt; /// bad quality table
	bp=header_sof;
	buf[bp++]=0xff; buf[bp++]=0xc0;
	buf[bp++]=0;  /// high byte length - always 0
	bpl=bp;       /// save pointer to length (low byte)
	bp++;
	buf[bp++]=0x8; /// 8bpp
	buf[bp++]=params->height >> 8; buf[bp++]=params->height; /// big endian height
	buf[bp++]=params->width  >> 8; buf[bp++]=params->width;  /// big endian width
	/// copy SOF0 (constants combined with bayer shift for jp4diff/jp4hdr)
	switch (params->color) {
	case COLORMODE_MONO6:    /// monochrome, (4:2:0),
	case COLORMODE_COLOR:    /// color, 4:2:0, 18x18(old)
	case COLORMODE_COLOR20:  /// color, 4:2:0, 20x20, middle of the tile (not yet implemented)
	case COLORMODE_JP46:     /// jp4, original (4:2:0)
		HEADER_COPY_SOF(sof_color6);
		break;
	case COLORMODE_MONO4:   /// monochrome, 4 blocks (but still with 2x2 macroblocks)
		HEADER_COPY_SOF(sof_mono4);
		break;
	case COLORMODE_JP4:     /// jp4, 4 blocks
		HEADER_COPY_SOF(sof_jp4);
		break;
	case COLORMODE_JP46DC:   /// jp4, dc -improved (4:2:0)
		HEADER_COPY_SOF(sof_jp46dc);
		break;
	case COLORMODE_JP4DC:   /// jp4, 4 blocks, dc -improved
		HEADER_COPY_SOF(sof_jp4dc);
		break;
	case COLORMODE_JP4DIFF:   /// jp4, 4 blocks, differential red := (R-G1), blue:=(B-G1), green=G1, green2 (G2-G1). G1 is defined by Bayer shift, any pixel can be used
	case COLORMODE_JP4DIFF2:   /// jp4, 4 blocks, differential, divide differences by 2: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (G2-G1)/2
		HEADER_COPY_SOF(sof_jp4diff);
		//header_sof
		//bshift
		buf[header_sof+12+3*((4-params->byrshift) & 3)]=0; /// set quantization table 0 for the "base color"
		break;
	case COLORMODE_JP4HDR:   /// jp4, 4 blocks, differential HDR: red := (R-G1), blue:=(B-G1), green=G1, green2 (high gain)=G2) (G1 and G2 - diagonally opposite)
	case COLORMODE_JP4HDR2:   /// jp4, 4 blocks, differential HDR: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (high gain)=G2)
		HEADER_COPY_SOF(sof_jp4diff); /// same as for COLORMODE_JP4DIFF
		buf[header_sof+12+3*((4-params->byrshift) & 3)]=0; /// set quantization table 0 for the "base color"
		buf[header_sof+12+3*((6-params->byrshift) & 3)]=0; /// set quantization table 0 for the HDR color
		break;
	}
	/// Include 4 huffman tables
	memcpy((void *) &buf[bp], (void *) huff_tables->dht_dc0, 5); /// DHT DC0 header
	bp+=5;
	len= (huff_tables->dht_dc0[2]<<8)+huff_tables->dht_dc0[3]-3;  /// table length itself, excluding 2 length bytes and type byte
	memcpy((void *) &buf[bp], (void *) &huff_tables->header_huffman_tables[0], len);
	bp+=len;

	memcpy((void *) &buf[bp], (void *) huff_tables->dht_ac0, 5); /// DHT AC0 header
	bp+=5;
	len= (huff_tables->dht_ac0[2]<<8)+huff_tables->dht_ac0[3]-3;  /// table length itself, excluding 2 length bytes and type byte
	memcpy((void *) &buf[bp], (void *) &huff_tables->header_huffman_tables[1], len);
	bp+=len;

	memcpy((void *) &buf[bp], (void *) huff_tables->dht_dc1, 5); /// DHT DC1 header
	bp+=5;
	len= (huff_tables->dht_dc1[2]<<8)+huff_tables->dht_dc1[3]-3;  /// table length itself, excluding 2 length bytes and type byte
	memcpy((void *) &buf[bp], (void *) &huff_tables->header_huffman_tables[2], len);
	bp+=len;

	memcpy((void *) &buf[bp], (void *) huff_tables->dht_ac1, 5); /// DHT AC1 header
	bp+=5;
	len= (huff_tables->dht_ac1[2]<<8)+huff_tables->dht_ac1[3]-3;  /// table length itself, excluding 2 length bytes and type byte
	memcpy((void *) &buf[bp], (void *) &huff_tables->header_huffman_tables[3], len);
	bp+=len;

	/// copy SOS0 (constants combined with bayer shift for jp4diff/jp4hdr)
	header_sos=bp;
	buf[bp++]=0xff; buf[bp++]=0xda; /// SOS tag
	buf[bp++]=0;  /// high byte length - always 0
	switch (params->color) {
	case COLORMODE_MONO6:    /// monochrome, (4:2:0),
	case COLORMODE_COLOR:    /// color, 4:2:0, 18x18(old)
	case COLORMODE_COLOR20:  /// color, 4:2:0, 20x20, middle of the tile (not yet implemented)
	case COLORMODE_JP46:     /// jp4, original (4:2:0)
		HEADER_COPY_SOS(sos_color6);
		break;
	case COLORMODE_MONO4:   /// monochrome, 4 blocks (but still with 2x2 macroblocks)
		HEADER_COPY_SOS(sos_mono4);
		break;
	case COLORMODE_JP4:     /// jp4, 4 blocks
		HEADER_COPY_SOS(sos_jp4);
		break;
	case COLORMODE_JP46DC:   /// jp4, dc -improved (4:2:0)
		HEADER_COPY_SOS(sos_jp46dc);
		break;
	case COLORMODE_JP4DC:   /// jp4, 4 blocks, dc -improved
		HEADER_COPY_SOS(sos_jp4dc);
		break;
	case COLORMODE_JP4DIFF:   /// jp4, 4 blocks, differential red := (R-G1), blue:=(B-G1), green=G1, green2 (G2-G1). G1 is defined by Bayer shift, any pixel can be used
	case COLORMODE_JP4DIFF2:   /// jp4, 4 blocks, differential, divide differences by 2: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (G2-G1)/2
		HEADER_COPY_SOS(sos_jp4diff);
		buf[header_sos+6+2*((4-params->byrshift) & 3)]=0; /// set huffman table 0 for the "base color"
		break;
	case COLORMODE_JP4HDR:   /// jp4, 4 blocks, differential HDR: red := (R-G1), blue:=(B-G1), green=G1, green2 (high gain)=G2) (G1 and G2 - diagonally opposite)
	case COLORMODE_JP4HDR2:   /// jp4, 4 blocks, differential HDR: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (high gain)=G2)
		HEADER_COPY_SOS(sos_jp4diff); /// same as for COLORMODE_JP4DIFF
		buf[header_sos+6+2*((4-params->byrshift) & 3)]=0; /// set huffman table 0 for the "base color"
		buf[header_sos+6+2*((6-params->byrshift) & 3)]=0; /// set huffman table 0 for the HDR color
		break;
	}
	buf[bp++]=0x00; /// Spectral selection start
	buf[bp++]=0x3f; /// Spectral selection end
	buf[bp++]=0x00; /// Successive approximation (2 values 0..13)

	dev_dbg(g_dev_ptr, "JPEG header length = %d\n", bp);
	dev_dbg(g_dev_ptr, "list of parameters:\n");
	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, p, 32);

	return bp; /// JPEG header length
Mikhail Karpenko's avatar
Mikhail Karpenko committed
318 319
}

320
int jpeghead_open(struct inode *inode, struct file *filp)
321
{
322 323
	unsigned int minor = MINOR(inode->i_rdev);
	unsigned int chn = minor_to_chn(minor, NULL);
Mikhail Karpenko's avatar
Mikhail Karpenko committed
324

325 326 327
	jpeghead_priv[chn].jpeg_h_sz = 0;
	inode->i_size=JPEG_HEADER_MAXSIZE; /// not the actual size
	return 0;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
328 329 330 331 332 333 334 335 336 337 338 339 340 341 342
}

/*!=================================================================
 *! Overloading lseek with additional functionality (to avoid ioctls)
 *! with orig==SEEK_END lseek will treat (offset>0) as a byte pointer
 *! in (char *)ccam_dma_buf_ptr of a frame pointer and use quality,
 *! width and height to regenerate header.
 *! frame pointers are 32-bytes aligned, so adding 1 to offest
 *! will make sure it is always >0 (as offset=0, orig=SEEK_END
 *! will just move pointer to the end and return file length.
 *! 
 *! When called with orig==SEEK_END, offset>0 lseek will position
 *! file at the very beginning and return 0 if OK, -EINVAL if
 *! frame header is not found for the specified offset
 *!================================================================*/
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367
loff_t jpeghead_lseek(struct file *file, loff_t offset, int orig,
		struct interframe_params_t *fp)
{
	int rp;
	unsigned int minor = MINOR(file->f_inode->i_rdev);
	unsigned int chn = minor_to_chn(minor, NULL);

	dev_dbg(g_dev_ptr, "start processing LSEEK operation, minor = 0x%x, offset = 0x%llx, orig = 0x%x", minor, offset, orig);

	switch (orig)
	{
	case SEEK_SET:
		file->f_pos = offset;
		break;
	case SEEK_CUR:
		file->f_pos += offset;
		break;
	case SEEK_END:
		if (offset <= 0) {
			file->f_pos = jpeghead_priv[chn].jpeg_h_sz + offset;
		} else {
			file->f_pos = 0;                     // reset it to 0 anyway
			if ((fp->signffff != MARKER_FFFF) || // signature is overwritten
					((fp->timestamp_sec) & X313_LENGTH_MASK)) return -EINVAL; //! acquisition of this frame is not done yet - length word high byte is non-zero
			if ((offset & 0x1f) == 0x2)
368
				jpeghead_priv[chn].jpeg_h_sz = qtables_create(fp, jpeghead_priv[chn].header, chn);  /// just qunatization tables (128 bytes) - for the streamer
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385
			else
				jpeghead_priv[chn].jpeg_h_sz = jpegheader_create(fp, jpeghead_priv[chn].header, chn); /// full JPEG header
			if (jpeghead_priv[chn].jpeg_h_sz < 0) {
				jpeghead_priv[chn].jpeg_h_sz = 0;
				return -EINVAL;                  // error in header
			}
			return ( file->f_pos );              // it is 0
		}
		break;
	default:
		return -EINVAL;
	}
	/// truncate position
	if (file->f_pos < 0) {
		file->f_pos = 0;
		return -EOVERFLOW;
	}
Mikhail Karpenko's avatar
Mikhail Karpenko committed
386

387 388 389 390
	if (file->f_pos > jpeghead_priv[chn].jpeg_h_sz) {
		file->f_pos = jpeghead_priv[chn].jpeg_h_sz;
	}
	return file->f_pos;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
391 392
}

393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412
ssize_t jpeghead_read(struct file *file, char *buf, size_t count, loff_t *off)
{
	unsigned long p;
	unsigned int minor = MINOR(file->f_inode->i_rdev);
	unsigned int chn = minor_to_chn(minor, NULL);

	dev_dbg(g_dev_ptr, "reading from jpeghead, minor = 0x%x, off = 0x%lld\n", minor, off);

	p = *off;
	if (p >= jpeghead_priv[chn].jpeg_h_sz)
		p = jpeghead_priv[chn].jpeg_h_sz;
	if ((p + count) > jpeghead_priv[chn].jpeg_h_sz) { /// truncate count
		count = jpeghead_priv[chn].jpeg_h_sz - p;
	}
	if (count) {
		if (copy_to_user(buf, &jpeghead_priv[chn].header[p], count))
			return -EFAULT;
		*off += count;
	}
	return count;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
413 414 415 416 417 418 419 420 421 422 423
}


/**huffman_* file operations
 * write, read Huffman tables, initialize tables to default ones, program FPGA with the Huffman tables
 * file structure is the same as the struct huff_tables_t:
 * - 4 tables of 16+256 elements (16 frequencies followed by symbols)
 * - 2048 bytes (512 unsigned long) FPGA-encoded data - it is recalculated from the tables above
 * - 4 bytes - number of symbols in each table (calculated)
 */

424 425 426
int huffman_open(struct inode *inode, struct file *filp)
{
	inode->i_size = sizeof(struct huff_tables_t);
Mikhail Karpenko's avatar
Mikhail Karpenko committed
427

428
	return 0;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
429 430 431 432 433 434 435 436 437 438 439 440 441 442 443
}

/*!=================================================================
 *! Overloading lseek with additional functionality
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_DC0 - position at Huffman DC0
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_AC0 - position at Huffman DC0
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_DC1 - position at Huffman DC0
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_AC1 - position at Huffman DC0
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_FPGATAB - position at FPGA table
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_DEFAULT - fill in default tables
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_FPGACALC - calculate FPGA table
 *! with orig==SEEK_END , offset==LSEEK_HUFFMAN_FPGAPGM - program FPGA table
 *! those commands do not move the file pointer (return current),
 *! or negative in the case of error (calculate FPGA table)
 *!================================================================*/
444 445
loff_t huffman_lseek(struct file *file, loff_t offset, int orig)
{
446
	unsigned int minor = MINOR(file->f_inode->i_rdev);
447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488
	unsigned int chn = minor_to_chn(minor, NULL);

	dev_dbg(g_dev_ptr, "start processing LSEEK operation, minor = 0x%x, offset = 0x%llx, orig = 0x%x", minor, offset, orig);

	switch (orig)
	{
	case SEEK_SET:
		file->f_pos = offset;
		break;
	case SEEK_CUR:
		file->f_pos += offset;
		break;
	case SEEK_END:
		if (offset <= 0) {
			file->f_pos = sizeof(struct huff_tables_t) + offset;
		} else {
			switch (offset) {
			case LSEEK_HUFFMAN_DC0:     file->f_pos=0; break;
			case LSEEK_HUFFMAN_AC0:     file->f_pos=1*sizeof(struct huffman_encoded_t);break;
			case LSEEK_HUFFMAN_DC1:     file->f_pos=2*sizeof(struct huffman_encoded_t);break;
			case LSEEK_HUFFMAN_AC1:     file->f_pos=3*sizeof(struct huffman_encoded_t);break;
			case LSEEK_HUFFMAN_FPGATAB: file->f_pos=4*sizeof(struct huffman_encoded_t);break;
			case LSEEK_HUFFMAN_DEFAULT: jpeg_htable_init(chn); break; // no change to file pointer
			case LSEEK_HUFFMAN_FPGACALC:
				if (jpeg_htable_fpga_encode (chn) < 0) return -EINVAL;
				break;
			case LSEEK_HUFFMAN_FPGAPGM: jpeg_htable_fpga_pgm(chn); break;
			default: return -EINVAL;
			}
			return ( file->f_pos );
		}
		break;
	default:
		return -EINVAL;
	}
	// truncate position
	if (file->f_pos < 0) {
		file->f_pos = 0;
		return(-EOVERFLOW);
	}
	if (file->f_pos > sizeof(struct huff_tables_t)) file->f_pos = sizeof(struct huff_tables_t);
	return ( file->f_pos );
Mikhail Karpenko's avatar
Mikhail Karpenko committed
489 490
}

491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509
ssize_t huffman_read(struct file *file, char *buf, size_t count, loff_t *off)
{
	unsigned long p;
	unsigned int minor = MINOR(file->f_inode->i_rdev);
	unsigned int chn = minor_to_chn(minor, NULL);
	unsigned char *uc_huff_tables = (unsigned char *) &jpeghead_priv[chn].huff_tables;

	dev_dbg(g_dev_ptr, "reading from huffman, minor = 0x%x, off = 0x%llx\n", minor, off);

	p = *off;
	if (p >= sizeof(struct huff_tables_t))
		p = sizeof(struct huff_tables_t);
	if ((p + count) > sizeof(struct huff_tables_t))
		count = sizeof(struct huff_tables_t) - p; /// truncate count
	if(count) {
		if (copy_to_user(buf, &uc_huff_tables[p], count)) return -EFAULT;
		*off += count;
	}
	return count;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
510 511
}

512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528
ssize_t huffman_write(struct file *file, const char *buf, size_t count, loff_t *off)
{
	unsigned long p;
	unsigned int minor = MINOR(file->f_inode->i_rdev);
	unsigned int chn = minor_to_chn(minor, NULL);
	unsigned char * uc_huff_tables= (unsigned char *) &jpeghead_priv[chn].huff_tables;

	dev_dbg(g_dev_ptr, "writing to huffman, minor = 0x%x, off = 0x%llx\n", minor, off);

	p = *off;
	if (p >= sizeof(struct huff_tables_t))
		p = sizeof(struct huff_tables_t);
	if ((p + count) > sizeof(struct huff_tables_t))
		count = sizeof(struct huff_tables_t) - p; /// truncate count
	if (count) {
		if (copy_from_user(&uc_huff_tables[p], buf, count)) return -EFAULT;
	}
Mikhail Karpenko's avatar
Mikhail Karpenko committed
529

530
	return count;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
531 532 533 534 535
}

/**
 * @brief Initialize Huffman tables with default data
 */
536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
void jpeg_htable_init(unsigned int chn)
{
	unsigned char dc0[]={0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,
			0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // number of codes of each length 1..16 (12 total)
			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, // symbols encoded (12)
			0x08, 0x09, 0x0a, 0x0b};

	unsigned char ac0[]={0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,
			0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d, // counts of codes of each length - 1..16 - total a2
			0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, // symbols encoded (0xa2)
			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};

	unsigned char dc1[]={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};

	unsigned char ac1[]={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, 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,
			0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
			0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
			0xf9, 0xfa};

	struct huff_tables_t *huff_tables = &jpeghead_priv[chn].huff_tables;

	dev_dbg(g_dev_ptr, "initialize Huffman table with default data\n");

	memset ((void*) huff_tables, 0, sizeof(struct huff_tables_t));
	memcpy ((void*) huff_tables->header_huffman_tables[0].bits, dc0, sizeof(dc0));
	memcpy ((void*) huff_tables->header_huffman_tables[1].bits, ac0, sizeof(ac0));
	memcpy ((void*) huff_tables->header_huffman_tables[2].bits, dc1, sizeof(dc1));
	memcpy ((void*) huff_tables->header_huffman_tables[3].bits, ac1, sizeof(ac1));

	jpeg_htable_fpga_encode(chn);
Mikhail Karpenko's avatar
Mikhail Karpenko committed
607 608 609
}

/**
610
 * @brief Encode all 4 Huffman tables into FPGA format
Mikhail Karpenko's avatar
Mikhail Karpenko committed
611 612 613
 * additionally calculates number of symbols in each table
 * @return OK - 0, -1 - too many symbols, -2 bad table, -3 - bad table number 
 */
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653
int jpeg_htable_fpga_encode(unsigned int chn)
{
	int ntab, i, rslt, a, length;
	const unsigned char dht_headers[20] = { /// length will be inserted later
			0xff, 0xc4, 0x00, 0x00, 0x00,
			0xff, 0xc4, 0x00, 0x00, 0x10,
			0xff, 0xc4, 0x00, 0x00, 0x01,
			0xff, 0xc4, 0x00, 0x00, 0x11 };
	struct huffman_fpga_code_t codes[256];
	unsigned long * icodes = (unsigned long *) codes;
	struct huff_tables_t *huff_tables = &jpeghead_priv[chn].huff_tables;

	dev_dbg(g_dev_ptr, "channel %d; encode all Huffman tables into FPGA format\n", chn);

	jpeghead_priv[chn].fpga_programmed = 0;
	/// Fill in the table headers:
	memcpy((void*) huff_tables->dht_all, (void*) dht_headers, sizeof(dht_headers)); /// all 4 headers (with zero length)
	for (ntab = 0; ntab < 4; ntab++) {
		dev_dbg(g_dev_ptr, "ntab = %d\n", ntab);
		memset(codes, 0, sizeof(codes));
		if ((rslt = jpeg_prep_htable(&huff_tables->header_huffman_tables[ntab], codes)) < 0) return rslt;
		if (ntab & 1) {
			a = ((ntab & 2) << 7);
			for (i = 0; i < 256; i += 16) {
				memcpy((void*) &(huff_tables->fpga_huffman_table[a]), (void*) &codes[i], 60); /// all but DC column
				a += 16;
			}
		} else {
			a = ((ntab & 2) << 7) + 0x0f; /// in FPGA DC use spare parts of AC table
			for (i = 0; i < 16; i++) {
				huff_tables->fpga_huffman_table[a] = icodes[i];
				a += 16;
			}
		}
		/// Fill in the table headers:
		length = 19; /// 2 length bytes, 1 type byte, 16 lengths bytes
		for (i = 0; i < 16; i++) length += huff_tables->header_huffman_tables[ntab].bits[i]; /// first 16 bytes in each table number of symbols
		huff_tables->dht_all[(5 * ntab) + 2] = length >> 8;  /// high byte (usually 0)
		huff_tables->dht_all[(5 * ntab) + 3] = length& 0xff; /// low  byte
	}
Mikhail Karpenko's avatar
Mikhail Karpenko committed
654

655 656 657
	dev_dbg(g_dev_ptr, "FPGA Huffman table:\n");
	print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, &huff_tables->fpga_huffman_table[0], sizeof(huff_tables->fpga_huffman_table));
	return 0;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
658 659 660
}

/**
661 662
 * @brief Check if the FPGA is programmed to the new Huffman table
 * @param[in]   chn   compressor channel number
Mikhail Karpenko's avatar
Mikhail Karpenko committed
663 664
 * @return 1 - programmed, 0 - not programmed
 */
665 666 667
int jpeg_htable_is_programmed(unsigned int chn)
{
	return jpeghead_priv[chn].fpga_programmed;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
668 669 670 671
}

/**
 * @brief program FPGA Huffman table (fram static array)
672
 * @param[in]   chn   compressor channel number
673
 * @return none
Mikhail Karpenko's avatar
Mikhail Karpenko committed
674
 */
675 676 677
void jpeg_htable_fpga_pgm(unsigned int chn)
{
	int i;
678
	unsigned long flags;
679
	x393_cmprs_table_addr_t table_addr;
680
	struct huff_tables_t *huff_tables = &jpeghead_priv[chn].huff_tables;
681 682 683

	table_addr.addr32 = 0;
	table_addr.type = 3;
684
	local_irq_save(flags);
685
	x393_cmprs_tables_address(table_addr, chn);
686
	for (i = 0; i < sizeof(huff_tables->fpga_huffman_table) / sizeof(huff_tables->fpga_huffman_table[0]); i++) {
687
		x393_cmprs_tables_data((u32)huff_tables->fpga_huffman_table[i], chn);
688
	}
689
	local_irq_restore(flags);
690
	jpeghead_priv[chn].fpga_programmed = 1;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
691 692 693
}

/**
694 695 696
 * @brief Calculate huffman table (1 of 4) from the JPEG header to code length/value (for FPGA)
 *
 * The code of this function is based on jdhuff.c (from libjpeg)
Mikhail Karpenko's avatar
Mikhail Karpenko committed
697 698 699 700
 * @param htable encoded Huffman table - 16 length bytes followed by up to 256 symbols
 * @param hcodes combined (length<<16) | code table for each symbol
 * @return OK- 0, -1 - too many symbols, -2 bad table
 */
701
int jpeg_prep_htable(struct huffman_encoded_t *htable, struct huffman_fpga_code_t *hcodes)
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
{
	int p, i, l, si, numsymbols;
	unsigned int code;
	dev_dbg(g_dev_ptr, "calculate Huffman table from JPEG header\n");
	/// Figure C.1: make table of Huffman code length for each symbol
	p = 0;
	for (l = 1; l <= 16; l++) {
		i = htable->bits[l-1];
		if (i < 0 || p + i > 256) {
			dev_dbg(g_dev_ptr, "protect against table overrun\n");
			return -1 ; /// protect against table overrun
		}
		while (i--) hcodes[htable->huffval[p++]].length=l;
	}
	numsymbols = p;
	/// Figure C.2: generate the codes themselves
	/// We also validate that the counts represent a legal Huffman code tree.
	code = 0;
	si = hcodes[htable->huffval[0]].length;
	p = 0;
	///htable->huffval[N] - N-th symbol value
	while (p < numsymbols) {
		if ((hcodes[htable->huffval[p]].length < si) || (si>16)) {
			dev_err(g_dev_ptr, "bad table/bug\n");
			return -3; ///Bad table
		}
		while (hcodes[htable->huffval[p]].length == si) {
			hcodes[htable->huffval[p++]].value = code;
			code++;
		}

		/** code is now 1 more than the last code used for codelength si; but
		 * it must still fit in si bits, since no code is allowed to be all ones.
		 */
		if ( code >= (1 << si)) {
			dev_err(g_dev_ptr, "bad code\n");
			return -2; ///Bad code
		}
		code <<= 1;
		si++;
	}
	return 0;
Mikhail Karpenko's avatar
Mikhail Karpenko committed
744 745
}

746 747 748 749 750 751 752 753 754 755
int jpeghead_init(struct platform_device *pdev)
{
	int i;

	g_dev_ptr = &pdev->dev;
	for (i = 0; i < IMAGE_CHN_NUM; i++) {
		jpeghead_priv[i].fpga_programmed = 0;
		jpeg_htable_init(i);
	}

756 757 758 759 760 761 762 763 764 765
	qt_init(pdev);
	dev_dbg(g_dev_ptr, "reset quantization tables\n");
	// force initialization at next access
	if (get_cache_policy() == COMMON_CACHE) {
		reset_qtables(0);
	} else if (get_cache_policy() == PER_CHN_CACHE) {
		for (i = 0; i < IMAGE_CHN_NUM; i++)
			reset_qtables(i);
	}

766 767
	return 0;
}