X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fmedia%2Fvideo%2Fpwc%2Fpwc-dec23.c;fp=drivers%2Fmedia%2Fvideo%2Fpwc%2Fpwc-dec23.c;h=9e2d91f26bfe065ca6c72ba716d5506929d0c771;hb=f05f9504c50ed069377d37f02f22e7a16b5921de;hp=0000000000000000000000000000000000000000;hpb=16c70f8c1b54b61c3b951b6fb220df250fe09b32;p=linux-2.6.git diff --git a/drivers/media/video/pwc/pwc-dec23.c b/drivers/media/video/pwc/pwc-dec23.c new file mode 100644 index 000000000..9e2d91f26 --- /dev/null +++ b/drivers/media/video/pwc/pwc-dec23.c @@ -0,0 +1,941 @@ +/* Linux driver for Philips webcam + Decompression for chipset version 2 et 3 + (C) 2004-2006 Luc Saillard (luc@saillard.org) + + NOTE: this version of pwc is an unofficial (modified) release of pwc & pcwx + driver and thus may have bugs that are not present in the original version. + Please send bug reports and support requests to . + The decompression routines have been implemented by reverse-engineering the + Nemosoft binary pwcx module. Caveat emptor. + + 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 2 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, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +*/ + +#include "pwc-timon.h" +#include "pwc-kiara.h" +#include "pwc-dec23.h" +#include + +#include + +/* + * USE_LOOKUP_TABLE_TO_CLAMP + * 0: use a C version of this tests: { a<0?0:(a>255?255:a) } + * 1: use a faster lookup table for cpu with a big cache (intel) + */ +#define USE_LOOKUP_TABLE_TO_CLAMP 1 +/* + * UNROLL_LOOP_FOR_COPYING_BLOCK + * 0: use a loop for a smaller code (but little slower) + * 1: when unrolling the loop, gcc produces some faster code (perhaps only + * valid for intel processor class). Activating this option, automaticaly + * activate USE_LOOKUP_TABLE_TO_CLAMP + */ +#define UNROLL_LOOP_FOR_COPY 1 +#if UNROLL_LOOP_FOR_COPY +# undef USE_LOOKUP_TABLE_TO_CLAMP +# define USE_LOOKUP_TABLE_TO_CLAMP 1 +#endif + +/* + * ENABLE_BAYER_DECODER + * 0: bayer decoder is not build (save some space) + * 1: bayer decoder is build and can be used + */ +#define ENABLE_BAYER_DECODER 0 + +static void build_subblock_pattern(struct pwc_dec23_private *pdec) +{ + static const unsigned int initial_values[12] = { + -0x526500, -0x221200, 0x221200, 0x526500, + -0x3de200, 0x3de200, + -0x6db480, -0x2d5d00, 0x2d5d00, 0x6db480, + -0x12c200, 0x12c200 + + }; + static const unsigned int values_derivated[12] = { + 0xa4ca, 0x4424, -0x4424, -0xa4ca, + 0x7bc4, -0x7bc4, + 0xdb69, 0x5aba, -0x5aba, -0xdb69, + 0x2584, -0x2584 + }; + unsigned int temp_values[12]; + int i, j; + + memcpy(temp_values, initial_values, sizeof(initial_values)); + for (i = 0; i < 256; i++) { + for (j = 0; j < 12; j++) { + pdec->table_subblock[i][j] = temp_values[j]; + temp_values[j] += values_derivated[j]; + } + } +} + +static void build_bit_powermask_table(struct pwc_dec23_private *pdec) +{ + unsigned char *p; + unsigned int bit, byte, mask, val; + unsigned int bitpower = 1; + + for (bit = 0; bit < 8; bit++) { + mask = bitpower - 1; + p = pdec->table_bitpowermask[bit]; + for (byte = 0; byte < 256; byte++) { + val = (byte & mask); + if (byte & bitpower) + val = -val; + *p++ = val; + } + bitpower<<=1; + } +} + + +static void build_table_color(const unsigned int romtable[16][8], + unsigned char p0004[16][1024], + unsigned char p8004[16][256]) +{ + int compression_mode, j, k, bit, pw; + unsigned char *p0, *p8; + const unsigned int *r; + + /* We have 16 compressions tables */ + for (compression_mode = 0; compression_mode < 16; compression_mode++) { + p0 = p0004[compression_mode]; + p8 = p8004[compression_mode]; + r = romtable[compression_mode]; + + for (j = 0; j < 8; j++, r++, p0 += 128) { + + for (k = 0; k < 16; k++) { + if (k == 0) + bit = 1; + else if (k >= 1 && k < 3) + bit = (r[0] >> 15) & 7; + else if (k >= 3 && k < 6) + bit = (r[0] >> 12) & 7; + else if (k >= 6 && k < 10) + bit = (r[0] >> 9) & 7; + else if (k >= 10 && k < 13) + bit = (r[0] >> 6) & 7; + else if (k >= 13 && k < 15) + bit = (r[0] >> 3) & 7; + else + bit = (r[0]) & 7; + if (k == 0) + *p8++ = 8; + else + *p8++ = j - bit; + *p8++ = bit; + + pw = 1 << bit; + p0[k + 0x00] = (1 * pw) + 0x80; + p0[k + 0x10] = (2 * pw) + 0x80; + p0[k + 0x20] = (3 * pw) + 0x80; + p0[k + 0x30] = (4 * pw) + 0x80; + p0[k + 0x40] = (-1 * pw) + 0x80; + p0[k + 0x50] = (-2 * pw) + 0x80; + p0[k + 0x60] = (-3 * pw) + 0x80; + p0[k + 0x70] = (-4 * pw) + 0x80; + } /* end of for (k=0; k<16; k++, p8++) */ + } /* end of for (j=0; j<8; j++ , table++) */ + } /* end of foreach compression_mode */ +} + +/* + * + */ +static void fill_table_dc00_d800(struct pwc_dec23_private *pdec) +{ +#define SCALEBITS 15 +#define ONE_HALF (1UL << (SCALEBITS - 1)) + int i; + unsigned int offset1 = ONE_HALF; + unsigned int offset2 = 0x0000; + + for (i=0; i<256; i++) { + pdec->table_dc00[i] = offset1 & ~(ONE_HALF); + pdec->table_d800[i] = offset2; + + offset1 += 0x7bc4; + offset2 += 0x7bc4; + } +} + +/* + * To decode the stream: + * if look_bits(2) == 0: # op == 2 in the lookup table + * skip_bits(2) + * end of the stream + * elif look_bits(3) == 7: # op == 1 in the lookup table + * skip_bits(3) + * yyyy = get_bits(4) + * xxxx = get_bits(8) + * else: # op == 0 in the lookup table + * skip_bits(x) + * + * For speedup processing, we build a lookup table and we takes the first 6 bits. + * + * struct { + * unsigned char op; // operation to execute + * unsigned char bits; // bits use to perform operation + * unsigned char offset1; // offset to add to access in the table_0004 % 16 + * unsigned char offset2; // offset to add to access in the table_0004 + * } + * + * How to build this table ? + * op == 2 when (i%4)==0 + * op == 1 when (i%8)==7 + * op == 0 otherwise + * + */ +static const unsigned char hash_table_ops[64*4] = { + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x10, + 0x00, 0x06, 0x01, 0x30, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x01, 0x20, + 0x01, 0x00, 0x00, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x50, + 0x00, 0x05, 0x02, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x03, 0x00, + 0x01, 0x00, 0x00, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x10, + 0x00, 0x06, 0x02, 0x10, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x01, 0x60, + 0x01, 0x00, 0x00, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x50, + 0x00, 0x05, 0x02, 0x40, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x03, 0x40, + 0x01, 0x00, 0x00, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x10, + 0x00, 0x06, 0x01, 0x70, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x01, 0x20, + 0x01, 0x00, 0x00, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x50, + 0x00, 0x05, 0x02, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x03, 0x00, + 0x01, 0x00, 0x00, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x10, + 0x00, 0x06, 0x02, 0x50, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x01, 0x60, + 0x01, 0x00, 0x00, 0x00, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x00, + 0x00, 0x04, 0x01, 0x50, + 0x00, 0x05, 0x02, 0x40, + 0x02, 0x00, 0x00, 0x00, + 0x00, 0x03, 0x01, 0x40, + 0x00, 0x05, 0x03, 0x40, + 0x01, 0x00, 0x00, 0x00 +}; + +/* + * + */ +static const unsigned int MulIdx[16][16] = { + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,}, + {0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3,}, + {0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,}, + {4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4,}, + {6, 7, 8, 9, 7, 10, 11, 8, 8, 11, 10, 7, 9, 8, 7, 6,}, + {4, 5, 5, 4, 4, 5, 5, 4, 4, 5, 5, 4, 4, 5, 5, 4,}, + {1, 3, 0, 2, 1, 3, 0, 2, 1, 3, 0, 2, 1, 3, 0, 2,}, + {0, 3, 3, 0, 1, 2, 2, 1, 2, 1, 1, 2, 3, 0, 0, 3,}, + {0, 1, 2, 3, 3, 2, 1, 0, 3, 2, 1, 0, 0, 1, 2, 3,}, + {1, 1, 1, 1, 3, 3, 3, 3, 0, 0, 0, 0, 2, 2, 2, 2,}, + {7, 10, 11, 8, 9, 8, 7, 6, 6, 7, 8, 9, 8, 11, 10, 7,}, + {4, 5, 5, 4, 5, 4, 4, 5, 5, 4, 4, 5, 4, 5, 5, 4,}, + {7, 9, 6, 8, 10, 8, 7, 11, 11, 7, 8, 10, 8, 6, 9, 7,}, + {1, 3, 0, 2, 2, 0, 3, 1, 2, 0, 3, 1, 1, 3, 0, 2,}, + {1, 2, 2, 1, 3, 0, 0, 3, 0, 3, 3, 0, 2, 1, 1, 2,}, + {10, 8, 7, 11, 8, 6, 9, 7, 7, 9, 6, 8, 11, 7, 8, 10} +}; + +#if USE_LOOKUP_TABLE_TO_CLAMP +#define MAX_OUTER_CROP_VALUE (512) +static unsigned char pwc_crop_table[256 + 2*MAX_OUTER_CROP_VALUE]; +#define CLAMP(x) (pwc_crop_table[MAX_OUTER_CROP_VALUE+(x)]) +#else +#define CLAMP(x) ((x)>255?255:((x)<0?0:x)) +#endif + + +/* If the type or the command change, we rebuild the lookup table */ +int pwc_dec23_init(struct pwc_device *pwc, int type, unsigned char *cmd) +{ + int flags, version, shift, i; + struct pwc_dec23_private *pdec; + + if (pwc->decompress_data == NULL) { + pdec = kmalloc(sizeof(struct pwc_dec23_private), GFP_KERNEL); + if (pdec == NULL) + return -ENOMEM; + pwc->decompress_data = pdec; + } + pdec = pwc->decompress_data; + + if (DEVICE_USE_CODEC3(type)) { + flags = cmd[2] & 0x18; + if (flags == 8) + pdec->nbits = 7; /* More bits, mean more bits to encode the stream, but better quality */ + else if (flags == 0x10) + pdec->nbits = 8; + else + pdec->nbits = 6; + + version = cmd[2] >> 5; + build_table_color(KiaraRomTable[version][0], pdec->table_0004_pass1, pdec->table_8004_pass1); + build_table_color(KiaraRomTable[version][1], pdec->table_0004_pass2, pdec->table_8004_pass2); + + } else { + + flags = cmd[2] & 6; + if (flags == 2) + pdec->nbits = 7; + else if (flags == 4) + pdec->nbits = 8; + else + pdec->nbits = 6; + + version = cmd[2] >> 3; + build_table_color(TimonRomTable[version][0], pdec->table_0004_pass1, pdec->table_8004_pass1); + build_table_color(TimonRomTable[version][1], pdec->table_0004_pass2, pdec->table_8004_pass2); + } + + /* Informations can be coded on a variable number of bits but never less than 8 */ + shift = 8 - pdec->nbits; + pdec->scalebits = SCALEBITS - shift; + pdec->nbitsmask = 0xFF >> shift; + + fill_table_dc00_d800(pdec); + build_subblock_pattern(pdec); + build_bit_powermask_table(pdec); + +#if USE_LOOKUP_TABLE_TO_CLAMP + /* Build the static table to clamp value [0-255] */ + for (i=0;i> scalebits]; + *d++ = cm[c[1] >> scalebits]; + *d++ = cm[c[2] >> scalebits]; + *d++ = cm[c[3] >> scalebits]; + + d = dst + bytes_per_line; + *d++ = cm[c[4] >> scalebits]; + *d++ = cm[c[5] >> scalebits]; + *d++ = cm[c[6] >> scalebits]; + *d++ = cm[c[7] >> scalebits]; + + d = dst + bytes_per_line*2; + *d++ = cm[c[8] >> scalebits]; + *d++ = cm[c[9] >> scalebits]; + *d++ = cm[c[10] >> scalebits]; + *d++ = cm[c[11] >> scalebits]; + + d = dst + bytes_per_line*3; + *d++ = cm[c[12] >> scalebits]; + *d++ = cm[c[13] >> scalebits]; + *d++ = cm[c[14] >> scalebits]; + *d++ = cm[c[15] >> scalebits]; +#else + int i; + const int *c = src; + unsigned char *d = dst; + for (i = 0; i < 4; i++, c++) + *d++ = CLAMP((*c) >> scalebits); + + d = dst + bytes_per_line; + for (i = 0; i < 4; i++, c++) + *d++ = CLAMP((*c) >> scalebits); + + d = dst + bytes_per_line*2; + for (i = 0; i < 4; i++, c++) + *d++ = CLAMP((*c) >> scalebits); + + d = dst + bytes_per_line*3; + for (i = 0; i < 4; i++, c++) + *d++ = CLAMP((*c) >> scalebits); +#endif +} + +/* + * Copy the 4x4 image block to a CrCb plane buffer + * + */ +static void copy_image_block_CrCb(const int *src, unsigned char *dst, unsigned int bytes_per_line, unsigned int scalebits) +{ +#if UNROLL_LOOP_FOR_COPY + /* Unroll all loops */ + const unsigned char *cm = pwc_crop_table+MAX_OUTER_CROP_VALUE; + const int *c = src; + unsigned char *d = dst; + + *d++ = cm[c[0] >> scalebits]; + *d++ = cm[c[4] >> scalebits]; + *d++ = cm[c[1] >> scalebits]; + *d++ = cm[c[5] >> scalebits]; + *d++ = cm[c[2] >> scalebits]; + *d++ = cm[c[6] >> scalebits]; + *d++ = cm[c[3] >> scalebits]; + *d++ = cm[c[7] >> scalebits]; + + d = dst + bytes_per_line; + *d++ = cm[c[12] >> scalebits]; + *d++ = cm[c[8] >> scalebits]; + *d++ = cm[c[13] >> scalebits]; + *d++ = cm[c[9] >> scalebits]; + *d++ = cm[c[14] >> scalebits]; + *d++ = cm[c[10] >> scalebits]; + *d++ = cm[c[15] >> scalebits]; + *d++ = cm[c[11] >> scalebits]; +#else + int i; + const int *c1 = src; + const int *c2 = src + 4; + unsigned char *d = dst; + + for (i = 0; i < 4; i++, c1++, c2++) { + *d++ = CLAMP((*c1) >> scalebits); + *d++ = CLAMP((*c2) >> scalebits); + } + c1 = src + 12; + d = dst + bytes_per_line; + for (i = 0; i < 4; i++, c1++, c2++) { + *d++ = CLAMP((*c1) >> scalebits); + *d++ = CLAMP((*c2) >> scalebits); + } +#endif +} + +#if ENABLE_BAYER_DECODER +/* + * Format: 8x2 pixels + * . G . G . G . G . G . G . G + * . . . . . . . . . . . . . . + * . G . G . G . G . G . G . G + * . . . . . . . . . . . . . . + * or + * . . . . . . . . . . . . . . + * G . G . G . G . G . G . G . + * . . . . . . . . . . . . . . + * G . G . G . G . G . G . G . +*/ +static void copy_image_block_Green(const int *src, unsigned char *dst, unsigned int bytes_per_line, unsigned int scalebits) +{ +#if UNROLL_LOOP_FOR_COPY + /* Unroll all loops */ + const unsigned char *cm = pwc_crop_table+MAX_OUTER_CROP_VALUE; + unsigned char *d = dst; + const int *c = src; + + d[0] = cm[c[0] >> scalebits]; + d[2] = cm[c[1] >> scalebits]; + d[4] = cm[c[2] >> scalebits]; + d[6] = cm[c[3] >> scalebits]; + d[8] = cm[c[4] >> scalebits]; + d[10] = cm[c[5] >> scalebits]; + d[12] = cm[c[6] >> scalebits]; + d[14] = cm[c[7] >> scalebits]; + + d = dst + bytes_per_line; + d[0] = cm[c[8] >> scalebits]; + d[2] = cm[c[9] >> scalebits]; + d[4] = cm[c[10] >> scalebits]; + d[6] = cm[c[11] >> scalebits]; + d[8] = cm[c[12] >> scalebits]; + d[10] = cm[c[13] >> scalebits]; + d[12] = cm[c[14] >> scalebits]; + d[14] = cm[c[15] >> scalebits]; +#else + int i; + unsigned char *d; + const int *c = src; + + d = dst; + for (i = 0; i < 8; i++, c++) + d[i*2] = CLAMP((*c) >> scalebits); + + d = dst + bytes_per_line; + for (i = 0; i < 8; i++, c++) + d[i*2] = CLAMP((*c) >> scalebits); +#endif +} +#endif + +#if ENABLE_BAYER_DECODER +/* + * Format: 4x4 pixels + * R . R . R . R + * . B . B . B . + * R . R . R . R + * . B . B . B . + */ +static void copy_image_block_RedBlue(const int *src, unsigned char *dst, unsigned int bytes_per_line, unsigned int scalebits) +{ +#if UNROLL_LOOP_FOR_COPY + /* Unroll all loops */ + const unsigned char *cm = pwc_crop_table+MAX_OUTER_CROP_VALUE; + unsigned char *d = dst; + const int *c = src; + + d[0] = cm[c[0] >> scalebits]; + d[2] = cm[c[1] >> scalebits]; + d[4] = cm[c[2] >> scalebits]; + d[6] = cm[c[3] >> scalebits]; + + d = dst + bytes_per_line; + d[1] = cm[c[4] >> scalebits]; + d[3] = cm[c[5] >> scalebits]; + d[5] = cm[c[6] >> scalebits]; + d[7] = cm[c[7] >> scalebits]; + + d = dst + bytes_per_line*2; + d[0] = cm[c[8] >> scalebits]; + d[2] = cm[c[9] >> scalebits]; + d[4] = cm[c[10] >> scalebits]; + d[6] = cm[c[11] >> scalebits]; + + d = dst + bytes_per_line*3; + d[1] = cm[c[12] >> scalebits]; + d[3] = cm[c[13] >> scalebits]; + d[5] = cm[c[14] >> scalebits]; + d[7] = cm[c[15] >> scalebits]; +#else + int i; + unsigned char *d; + const int *c = src; + + d = dst; + for (i = 0; i < 4; i++, c++) + d[i*2] = CLAMP((*c) >> scalebits); + + d = dst + bytes_per_line; + for (i = 0; i < 4; i++, c++) + d[i*2+1] = CLAMP((*c) >> scalebits); + + d = dst + bytes_per_line*2; + for (i = 0; i < 4; i++, c++) + d[i*2] = CLAMP((*c) >> scalebits); + + d = dst + bytes_per_line*3; + for (i = 0; i < 4; i++, c++) + d[i*2+1] = CLAMP((*c) >> scalebits); +#endif +} +#endif + +/* + * To manage the stream, we keep bits in a 32 bits register. + * fill_nbits(n): fill the reservoir with at least n bits + * skip_bits(n): discard n bits from the reservoir + * get_bits(n): fill the reservoir, returns the first n bits and discard the + * bits from the reservoir. + * __get_nbits(n): faster version of get_bits(n), but asumes that the reservoir + * contains at least n bits. bits returned is discarded. + */ +#define fill_nbits(pdec, nbits_wanted) do { \ + while (pdec->nbits_in_reservoir<(nbits_wanted)) \ + { \ + pdec->reservoir |= (*(pdec->stream)++) << (pdec->nbits_in_reservoir); \ + pdec->nbits_in_reservoir += 8; \ + } \ +} while(0); + +#define skip_nbits(pdec, nbits_to_skip) do { \ + pdec->reservoir >>= (nbits_to_skip); \ + pdec->nbits_in_reservoir -= (nbits_to_skip); \ +} while(0); + +#define get_nbits(pdec, nbits_wanted, result) do { \ + fill_nbits(pdec, nbits_wanted); \ + result = (pdec->reservoir) & ((1U<<(nbits_wanted))-1); \ + skip_nbits(pdec, nbits_wanted); \ +} while(0); + +#define __get_nbits(pdec, nbits_wanted, result) do { \ + result = (pdec->reservoir) & ((1U<<(nbits_wanted))-1); \ + skip_nbits(pdec, nbits_wanted); \ +} while(0); + +#define look_nbits(pdec, nbits_wanted) \ + ((pdec->reservoir) & ((1U<<(nbits_wanted))-1)) + +/* + * Decode a 4x4 pixel block + */ +static void decode_block(struct pwc_dec23_private *pdec, + const unsigned char *ptable0004, + const unsigned char *ptable8004) +{ + unsigned int primary_color; + unsigned int channel_v, offset1, op; + int i; + + fill_nbits(pdec, 16); + __get_nbits(pdec, pdec->nbits, primary_color); + + if (look_nbits(pdec,2) == 0) { + skip_nbits(pdec, 2); + /* Very simple, the color is the same for all pixels of the square */ + for (i = 0; i < 16; i++) + pdec->temp_colors[i] = pdec->table_dc00[primary_color]; + + return; + } + + /* This block is encoded with small pattern */ + for (i = 0; i < 16; i++) + pdec->temp_colors[i] = pdec->table_d800[primary_color]; + + __get_nbits(pdec, 3, channel_v); + channel_v = ((channel_v & 1) << 2) | (channel_v & 2) | ((channel_v & 4) >> 2); + + ptable0004 += (channel_v * 128); + ptable8004 += (channel_v * 32); + + offset1 = 0; + do + { + unsigned int htable_idx, rows = 0; + const unsigned int *block; + + /* [ zzzz y x x ] + * xx == 00 :=> end of the block def, remove the two bits from the stream + * yxx == 111 + * yxx == any other value + * + */ + fill_nbits(pdec, 16); + htable_idx = look_nbits(pdec, 6); + op = hash_table_ops[htable_idx * 4]; + + if (op == 2) { + skip_nbits(pdec, 2); + + } else if (op == 1) { + /* 15bits [ xxxx xxxx yyyy 111 ] + * yyy => offset in the table8004 + * xxx => offset in the tabled004 (tree) + */ + unsigned int mask, shift; + unsigned int nbits, col1; + unsigned int yyyy; + + skip_nbits(pdec, 3); + /* offset1 += yyyy */ + __get_nbits(pdec, 4, yyyy); + offset1 += 1 + yyyy; + offset1 &= 0x0F; + nbits = ptable8004[offset1 * 2]; + + /* col1 = xxxx xxxx */ + __get_nbits(pdec, nbits+1, col1); + + /* Bit mask table */ + mask = pdec->table_bitpowermask[nbits][col1]; + shift = ptable8004[offset1 * 2 + 1]; + rows = ((mask << shift) + 0x80) & 0xFF; + + block = pdec->table_subblock[rows]; + for (i = 0; i < 16; i++) + pdec->temp_colors[i] += block[MulIdx[offset1][i]]; + + } else { + /* op == 0 + * offset1 is coded on 3 bits + */ + unsigned int shift; + + offset1 += hash_table_ops [htable_idx * 4 + 2]; + offset1 &= 0x0F; + + rows = ptable0004[offset1 + hash_table_ops [htable_idx * 4 + 3]]; + block = pdec->table_subblock[rows]; + for (i = 0; i < 16; i++) + pdec->temp_colors[i] += block[MulIdx[offset1][i]]; + + shift = hash_table_ops[htable_idx * 4 + 1]; + skip_nbits(pdec, shift); + } + + } while (op != 2); + +} + +static void DecompressBand23(struct pwc_dec23_private *pdec, + const unsigned char *rawyuv, + unsigned char *planar_y, + unsigned char *planar_u, + unsigned char *planar_v, + unsigned int compressed_image_width, + unsigned int real_image_width) +{ + int compression_index, nblocks; + const unsigned char *ptable0004; + const unsigned char *ptable8004; + + pdec->reservoir = 0; + pdec->nbits_in_reservoir = 0; + pdec->stream = rawyuv + 1; /* The first byte of the stream is skipped */ + + get_nbits(pdec, 4, compression_index); + + /* pass 1: uncompress Y component */ + nblocks = compressed_image_width / 4; + + ptable0004 = pdec->table_0004_pass1[compression_index]; + ptable8004 = pdec->table_8004_pass1[compression_index]; + + /* Each block decode a square of 4x4 */ + while (nblocks) { + decode_block(pdec, ptable0004, ptable8004); + copy_image_block_Y(pdec->temp_colors, planar_y, real_image_width, pdec->scalebits); + planar_y += 4; + nblocks--; + } + + /* pass 2: uncompress UV component */ + nblocks = compressed_image_width / 8; + + ptable0004 = pdec->table_0004_pass2[compression_index]; + ptable8004 = pdec->table_8004_pass2[compression_index]; + + /* Each block decode a square of 4x4 */ + while (nblocks) { + decode_block(pdec, ptable0004, ptable8004); + copy_image_block_CrCb(pdec->temp_colors, planar_u, real_image_width/2, pdec->scalebits); + + decode_block(pdec, ptable0004, ptable8004); + copy_image_block_CrCb(pdec->temp_colors, planar_v, real_image_width/2, pdec->scalebits); + + planar_v += 8; + planar_u += 8; + nblocks -= 2; + } + +} + +#if ENABLE_BAYER_DECODER +/* + * Size need to be a multiple of 8 in width + * + * Return a block of four line encoded like this: + * + * G R G R G R G R G R G R G R G R + * B G B G B G B G B G B G B G B G + * G R G R G R G R G R G R G R G R + * B G B G B G B G B G B G B G B G + * + */ +static void DecompressBandBayer(struct pwc_dec23_private *pdec, + const unsigned char *rawyuv, + unsigned char *rgbbayer, + unsigned int compressed_image_width, + unsigned int real_image_width) +{ + int compression_index, nblocks; + const unsigned char *ptable0004; + const unsigned char *ptable8004; + unsigned char *dest; + + pdec->reservoir = 0; + pdec->nbits_in_reservoir = 0; + pdec->stream = rawyuv + 1; /* The first byte of the stream is skipped */ + + get_nbits(pdec, 4, compression_index); + + /* pass 1: uncompress RB component */ + nblocks = compressed_image_width / 4; + + ptable0004 = pdec->table_0004_pass1[compression_index]; + ptable8004 = pdec->table_8004_pass1[compression_index]; + dest = rgbbayer; + + /* Each block decode a square of 4x4 */ + while (nblocks) { + decode_block(pdec, ptable0004, ptable8004); + copy_image_block_RedBlue(pdec->temp_colors, rgbbayer, real_image_width, pdec->scalebits); + dest += 8; + nblocks--; + } + + /* pass 2: uncompress G component */ + nblocks = compressed_image_width / 8; + + ptable0004 = pdec->table_0004_pass2[compression_index]; + ptable8004 = pdec->table_8004_pass2[compression_index]; + + /* Each block decode a square of 4x4 */ + while (nblocks) { + decode_block(pdec, ptable0004, ptable8004); + copy_image_block_Green(pdec->temp_colors, rgbbayer+1, real_image_width, pdec->scalebits); + + decode_block(pdec, ptable0004, ptable8004); + copy_image_block_Green(pdec->temp_colors, rgbbayer+real_image_width, real_image_width, pdec->scalebits); + + rgbbayer += 16; + nblocks -= 2; + } +} +#endif + + +/** + * + * Uncompress a pwc23 buffer. + * + * pwc.view: size of the image wanted + * pwc.image: size of the image returned by the camera + * pwc.offset: (x,y) to displayer image in the view + * + * src: raw data + * dst: image output + * flags: PWCX_FLAG_PLANAR or PWCX_FLAG_BAYER + */ +void pwc_dec23_decompress(const struct pwc_device *pwc, + const void *src, + void *dst, + int flags) +{ + int bandlines_left, stride, bytes_per_block; + + bandlines_left = pwc->image.y / 4; + bytes_per_block = pwc->view.x * 4; + + if (flags & PWCX_FLAG_BAYER) { +#if ENABLE_BAYER_DECODER + /* RGB Bayer format */ + unsigned char *rgbout; + + stride = pwc->view.x * pwc->offset.y; + rgbout = dst + stride + pwc->offset.x; + + + while (bandlines_left--) { + + DecompressBandBayer(pwc->decompress_data, + src, + rgbout, + pwc->image.x, pwc->view.x); + + src += pwc->vbandlength; + rgbout += bytes_per_block; + + } +#else + memset(dst, 0, pwc->view.x * pwc->view.y); +#endif + + } else { + /* YUV420P image format */ + unsigned char *pout_planar_y; + unsigned char *pout_planar_u; + unsigned char *pout_planar_v; + unsigned int plane_size; + + plane_size = pwc->view.x * pwc->view.y; + + /* offset in Y plane */ + stride = pwc->view.x * pwc->offset.y; + pout_planar_y = dst + stride + pwc->offset.x; + + /* offsets in U/V planes */ + stride = (pwc->view.x * pwc->offset.y) / 4 + pwc->offset.x / 2; + pout_planar_u = dst + plane_size + stride; + pout_planar_v = dst + plane_size + plane_size / 4 + stride; + + while (bandlines_left--) { + + DecompressBand23(pwc->decompress_data, + src, + pout_planar_y, pout_planar_u, pout_planar_v, + pwc->image.x, pwc->view.x); + src += pwc->vbandlength; + pout_planar_y += bytes_per_block; + pout_planar_u += pwc->view.x; + pout_planar_v += pwc->view.x; + + } + + } + +} + +void pwc_dec23_exit(void) +{ + /* Do nothing */ + +} + +/** + * Allocate a private structure used by lookup table. + * You must call kfree() to free the memory allocated. + */ +int pwc_dec23_alloc(struct pwc_device *pwc) +{ + pwc->decompress_data = kmalloc(sizeof(struct pwc_dec23_private), GFP_KERNEL); + if (pwc->decompress_data == NULL) + return -ENOMEM; + return 0; +} + +/* vim: set cino= formatoptions=croql cindent shiftwidth=8 tabstop=8: */