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linux-next/drivers/media/usb/pwc/pwc-dec23.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/* 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 <luc@saillard.org>.
The decompression routines have been implemented by reverse-engineering the
Nemosoft binary pwcx module. Caveat emptor.
*/
#include "pwc-timon.h"
#include "pwc-kiara.h"
#include "pwc-dec23.h"
#include <linux/string.h>
#include <linux/slab.h>
/*
* 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, automatically
* 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
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 */
void pwc_dec23_init(struct pwc_device *pdev, const unsigned char *cmd)
{
int flags, version, shift, i;
struct pwc_dec23_private *pdec = &pdev->dec23;
mutex_init(&pdec->lock);
if (pdec->last_cmd_valid && pdec->last_cmd == cmd[2])
return;
if (DEVICE_USE_CODEC3(pdev->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);
}
/* Information 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<MAX_OUTER_CROP_VALUE;i++)
pwc_crop_table[i] = 0;
for (i=0; i<256; i++)
pwc_crop_table[MAX_OUTER_CROP_VALUE+i] = i;
for (i=0; i<MAX_OUTER_CROP_VALUE; i++)
pwc_crop_table[MAX_OUTER_CROP_VALUE+256+i] = 255;
#endif
pdec->last_cmd = cmd[2];
pdec->last_cmd_valid = 1;
}
/*
* Copy the 4x4 image block to Y plane buffer
*/
static void copy_image_block_Y(const int *src, unsigned char *dst, unsigned int bytes_per_line, unsigned int scalebits)
{
#if UNROLL_LOOP_FOR_COPY
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[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
}
/*
* 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;
}
}
/**
* Uncompress a pwc23 buffer.
* @pdev: pointer to pwc device's internal struct
* @src: raw data
* @dst: image output
*/
void pwc_dec23_decompress(struct pwc_device *pdev,
const void *src,
void *dst)
{
int bandlines_left, bytes_per_block;
struct pwc_dec23_private *pdec = &pdev->dec23;
/* YUV420P image format */
unsigned char *pout_planar_y;
unsigned char *pout_planar_u;
unsigned char *pout_planar_v;
unsigned int plane_size;
mutex_lock(&pdec->lock);
bandlines_left = pdev->height / 4;
bytes_per_block = pdev->width * 4;
plane_size = pdev->height * pdev->width;
pout_planar_y = dst;
pout_planar_u = dst + plane_size;
pout_planar_v = dst + plane_size + plane_size / 4;
while (bandlines_left--) {
DecompressBand23(pdec, src,
pout_planar_y, pout_planar_u, pout_planar_v,
pdev->width, pdev->width);
src += pdev->vbandlength;
pout_planar_y += bytes_per_block;
pout_planar_u += pdev->width;
pout_planar_v += pdev->width;
}
mutex_unlock(&pdec->lock);
}
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