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Data Structures | |
| struct | huffman_fpga_code_t |
| struct | jpeghead_pd |
| struct | huffman_pd |
Defines | |
| #define | JPEG_HEADER_MAXSIZE 0x300 |
Functions | |
| int | qtables_create (struct interframe_params_t *params, unsigned char *buf) |
| just copy two quantization tables for the current frame (for the RTP streamer) | |
| int | jpegheader_create (struct interframe_params_t *params, unsigned char *buf) |
| create JPEG header for the frame acquired earlier | |
| int | jpeghead_open (struct inode *inode, struct file *filp) |
| loff_t | jpeghead_lseek (struct file *file, loff_t offset, int orig) |
| ssize_t | jpeghead_read (struct file *file, char *buf, size_t count, loff_t *off) |
| int | huffman_open (struct inode *inode, struct file *filp) |
| int | huffman_release (struct inode *inode, struct file *filp) |
| loff_t | huffman_lseek (struct file *file, loff_t offset, int orig) |
| ssize_t | huffman_read (struct file *file, char *buf, size_t count, loff_t *off) |
| ssize_t | huffman_write (struct file *file, const char *buf, size_t count, loff_t *off) |
| void | init_ccam_dma_buf_ptr (void) |
| still used in autoexposure or something - why is in needed there? | |
| int | jpeg_htable_is_programmed (void) |
| check if the FPGA is programmed to the new Huffman table | |
| void | jpeg_htable_init (void) |
| Initialize Huffman tables with default data. | |
| int | jpeg_htable_fpga_encode (void) |
| encode all 4 Huffman tables into FPGA format additionally calculates number of symbols in each table | |
| void | jpeg_htable_fpga_pgm (void) |
| program FPGA Huffman table (fram static array) | |
| int | jpeg_prep_htable (struct huffman_encoded_t *htable, struct huffman_fpga_code_t *hcodes) |
| Does it depend on no missing symbols? | |
Variables | |
| unsigned long * | ccam_dma_buf_ptr |
| Without "static" system hangs after "Uncompressing Linux... | |
| #define JPEG_HEADER_MAXSIZE 0x300 |
Definition at line 23 of file jpeghead.h.
| loff_t huffman_lseek | ( | struct file * | file, | |
| loff_t | offset, | |||
| int | orig | |||
| ) |
================================================================= ! 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) !================================================================
New functionality
Definition at line 491 of file jpeghead.c.
References huff_tables, jpeg_htable_fpga_encode(), jpeg_htable_fpga_pgm(), jpeg_htable_init(), LSEEK_HUFFMAN_AC0, LSEEK_HUFFMAN_AC1, LSEEK_HUFFMAN_DC0, LSEEK_HUFFMAN_DC1, LSEEK_HUFFMAN_DEFAULT, LSEEK_HUFFMAN_FPGACALC, LSEEK_HUFFMAN_FPGAPGM, LSEEK_HUFFMAN_FPGATAB, SEEK_CUR, SEEK_END, and SEEK_SET.
Referenced by circbuf_all_lseek().
| int huffman_open | ( | struct inode * | inode, | |
| struct file * | filp | |||
| ) |
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:
Definition at line 466 of file jpeghead.c.
References GFP_KERNEL, huff_tables, kmalloc, and huffman_pd::minor.
Referenced by circbuf_all_open().
| ssize_t huffman_read | ( | struct file * | file, | |
| char * | buf, | |||
| size_t | count, | |||
| loff_t * | off | |||
| ) |
Definition at line 538 of file jpeghead.c.
References huff_tables, MDF17, and printk.
Referenced by circbuf_all_read().
| int huffman_release | ( | struct inode * | inode, | |
| struct file * | filp | |||
| ) |
| ssize_t huffman_write | ( | struct file * | file, | |
| const char * | buf, | |||
| size_t | count, | |||
| loff_t * | off | |||
| ) |
Definition at line 553 of file jpeghead.c.
References huff_tables, MDF17, and printk.
Referenced by circbuf_all_write().
| void init_ccam_dma_buf_ptr | ( | void | ) |
still used in autoexposure or something - why is in needed there?
Definition at line 243 of file circbuf.c.
References ccam_dma_buf.
Referenced by image_acq_init().
| int jpeg_htable_fpga_encode | ( | void | ) |
encode all 4 Huffman tables into FPGA format additionally calculates number of symbols in each table
length will be inserted later
mark FPGA table as needed to be programmed
Fill in the table headers:
all 4 headers (with zero length)
all but DC column
in FPGA DC use spare parts of AC table
Fill in the table headers:
2 length bytes, 1 type byte, 16 lengths bytes
first 16 bytes in each table number of symbols
high byte (usually 0)
low byte
Definition at line 643 of file jpeghead.c.
References a, huffman_encoded_t::bits, huff_tables_t::dht_all, huff_tables_t::fpga_huffman_table, huff_tables_t::header_huffman_tables, huff_tables, huffman_fpga_programmed, jpeg_prep_htable(), length, MDF17, memcpy(), memset(), and printk.
Referenced by huffman_lseek(), and jpeg_htable_init().
| void jpeg_htable_fpga_pgm | ( | void | ) |
program FPGA Huffman table (fram static array)
Definition at line 696 of file jpeghead.c.
References CX313_FPGA_TABLES_HUFF, huff_tables_t::fpga_huffman_table, fpga_table_write_nice(), huff_tables, and huffman_fpga_programmed.
Referenced by huffman_lseek(), and pgm_compmode().
| void jpeg_htable_init | ( | void | ) |
Initialize Huffman tables with default data.
. number of codes of each length 1..16 (12 total)
symbols encoded (12)
symbols encoded (0xa2)
Definition at line 570 of file jpeghead.c.
References huff_tables, jpeg_htable_fpga_encode(), MDF17, memcpy(), memset(), and printk.
Referenced by circbuf_all_init(), and huffman_lseek().
| int jpeg_htable_is_programmed | ( | void | ) |
check if the FPGA is programmed to the new Huffman table
Definition at line 689 of file jpeghead.c.
References huffman_fpga_programmed.
Referenced by pgm_compmode().
| int jpeg_prep_htable | ( | struct huffman_encoded_t * | htable, | |
| struct huffman_fpga_code_t * | hcodes | |||
| ) |
Does it depend on no missing symbols?
| htable | encoded Huffman table - 16 length bytes followed by up to 256 symbols | |
| hcodes | combined (length<<16) | code table for each symbol |
Figure C.1: make table of Huffman code length for each symbol
protect against table overrun
Figure C.2: generate the codes themselves We also validate that the counts represent a legal Huffman code tree.
htable->huffval[N] - N-th symbol value
Bad table
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.
Bad code
Definition at line 709 of file jpeghead.c.
References huffman_encoded_t::bits, ELP_KERR, huffman_encoded_t::huffval, huffman_fpga_code_t::length, MDF17, printk, and huffman_fpga_code_t::value.
Referenced by jpeg_htable_fpga_encode().
| loff_t jpeghead_lseek | ( | struct file * | file, | |
| loff_t | offset, | |||
| int | orig | |||
| ) |
================================================================= ! 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 !================================================================
New functionality
32 bytes before the frame pointer, may roll-over to the end of ccam_dma_buf_ptr
signature is overwritten
acquisition of this frame is not done yet - length word high byte is non-zero
FIXME: pp_index=fp->past_index; /// unsigned short if (pp_index>=PASTPARS_SAVE_ENTRIES) return -EINVAL; /// wrong index privData->size= jpegheader_create( pastpars[pp_index].past_pars, privData->header);
just qunatization tables (128 bytes) - for the streamer
full JPEG header
error in header
it is 0
truncate position
Definition at line 384 of file jpeghead.c.
References ccam_dma_buf_ptr, fp, jpeghead_pd::header, jpegheader_create(), MDF17, printk, qtables_create(), rp, SEEK_CUR, SEEK_END, SEEK_SET, jpeghead_pd::size, X313_BUFFSUB, and X313_LENGTH_MASK.
Referenced by circbuf_all_lseek().
| int jpeghead_open | ( | struct inode * | inode, | |
| struct file * | filp | |||
| ) |
make it blocking to use shared resource - jpeg header that may need re-calculation for different requests? or use individual header arrays?
undefined yet
not the actual size
Definition at line 358 of file jpeghead.c.
References GFP_KERNEL, JPEG_HEADER_MAXSIZE, kmalloc, jpeghead_pd::minor, and size.
Referenced by circbuf_all_open().
| ssize_t jpeghead_read | ( | struct file * | file, | |
| char * | buf, | |||
| size_t | count, | |||
| loff_t * | off | |||
| ) |
Definition at line 439 of file jpeghead.c.
References jpeghead_pd::header, MDF17, printk, and jpeghead_pd::size.
Referenced by circbuf_all_read().
| int jpegheader_create | ( | struct interframe_params_t * | params, | |
| unsigned char * | buf | |||
| ) |
create JPEG header for the frame acquired earlier
| params | pointer to an array of parameters stored for the frame | |
| buf | buffer to put the header to |
buffer pointer
pointer to length word in the buffer
start of SOS (varaible)
first constant part of the header - 0x19 bytes
SOI start of image
APP0
(16 bytes long)
JFIF null terminated
DQT (define quantization table)
0x43 bytes long
table number + (bytes-1)<<4 (0ne byte - 0, 2 bytes - 0x10)
second constant part of the header (starting from byte 0x59 - 0x5 bytes)
DQT (define quantization table)
0x43 bytes long
table number + (bytes-1)<<4 (0ne byte - 0, 2 bytes - 0x10)
id , freqx/freqy, q
id, hufftable_dc/htable_ac
id , freqx/freqy, q
id, hufftable_dc/htable_ac
id , freqx/freqy, q
id, hufftable_dc/htable_ac
id , freqx/freqy, q
id, hufftable_dc/htable_ac
id , freqx/freqy, q
id, hufftable_dc/htable_ac
will be adjusted to bayer shift, same for jp4hdr
id, hufftable_dc/htable_ac
buffer is not provided
including DQT0 header
DQT1 header
will copy both quantization tables
bad quality table
high byte length - always 0
save pointer to length (low byte)
8bpp
big endian height
big endian width
copy SOF0 (constants combined with bayer shift for jp4diff/jp4hdr)
monochrome, (4:2:0),
color, 4:2:0, 18x18(old)
color, 4:2:0, 20x20, middle of the tile (not yet implemented)
jp4, original (4:2:0)
monochrome, 4 blocks (but still with 2x2 macroblocks)
jp4, 4 blocks
jp4, dc -improved (4:2:0)
jp4, 4 blocks, dc -improved
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
jp4, 4 blocks, differential, divide differences by 2: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (G2-G1)/2
set quantization table 0 for the "base color"
jp4, 4 blocks, differential HDR: red := (R-G1), blue:=(B-G1), green=G1, green2 (high gain)=G2) (G1 and G2 - diagonally opposite)
jp4, 4 blocks, differential HDR: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (high gain)=G2)
same as for COLORMODE_JP4DIFF
set quantization table 0 for the "base color"
set quantization table 0 for the HDR color
Include 4 huffman tables
DHT DC0 header
table length itself, excluding 2 length bytes and type byte
DHT AC0 header
table length itself, excluding 2 length bytes and type byte
DHT DC1 header
table length itself, excluding 2 length bytes and type byte
DHT AC1 header
table length itself, excluding 2 length bytes and type byte
copy SOS0 (constants combined with bayer shift for jp4diff/jp4hdr)
SOS tag
high byte length - always 0
monochrome, (4:2:0),
color, 4:2:0, 18x18(old)
color, 4:2:0, 20x20, middle of the tile (not yet implemented)
jp4, original (4:2:0)
monochrome, 4 blocks (but still with 2x2 macroblocks)
jp4, 4 blocks
jp4, dc -improved (4:2:0)
jp4, 4 blocks, dc -improved
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
jp4, 4 blocks, differential, divide differences by 2: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (G2-G1)/2
set huffman table 0 for the "base color"
jp4, 4 blocks, differential HDR: red := (R-G1), blue:=(B-G1), green=G1, green2 (high gain)=G2) (G1 and G2 - diagonally opposite)
jp4, 4 blocks, differential HDR: red := (R-G1)/2, blue:=(B-G1)/2, green=G1, green2 (high gain)=G2)
same as for COLORMODE_JP4DIFF
set huffman table 0 for the "base color"
set huffman table 0 for the HDR color
Spectral selection start
Spectral selection end
Successive approximation (2 values 0..13)
JPEG header length
Definition at line 162 of file jpeghead.c.
References COLORMODE_COLOR, COLORMODE_COLOR20, COLORMODE_JP4, COLORMODE_JP46, COLORMODE_JP46DC, COLORMODE_JP4DC, COLORMODE_JP4DIFF, COLORMODE_JP4DIFF2, COLORMODE_JP4HDR, COLORMODE_JP4HDR2, COLORMODE_MONO4, COLORMODE_MONO6, huff_tables_t::dht_ac0, huff_tables_t::dht_ac1, huff_tables_t::dht_dc0, huff_tables_t::dht_dc1, get_qtable(), HEADER_COPY_SOF, HEADER_COPY_SOS, huff_tables_t::header_huffman_tables, huff_tables, MDF17, MDF18, memcpy(), params, and printk.
Referenced by jpeghead_lseek().
| int qtables_create | ( | struct interframe_params_t * | params, | |
| unsigned char * | buf | |||
| ) |
just copy two quantization tables for the current frame (for the RTP streamer)
| params | pointer to an array of parameters stored for the frame | |
| buf | buffer to put the header to |
will copy both quantization tables
bad quality table
Definition at line 150 of file jpeghead.c.
References get_qtable(), MDF18, params, and printk.
Referenced by jpeghead_lseek().
| unsigned long* ccam_dma_buf_ptr |
1.5.1