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ebebd4b880fc415f09f76597b2ac7f30e79212b9 - libv4lconvert/Makefile
66dd7958319442bd52ba40ede28fbfe31bb4e074 - libv4lconvert/cpia1.c
3271d74d02e2f33c16e3e50aeb1268eb9c440782 - libv4lconvert/rgbyuv.c
db3c69c666e451c5d4ef6d1b5a3117f4b128baa4 - libv4lconvert/libv4lconvert-priv.h
1f1d1e05443c4b824cd697c0ce5efa9ea1277964 - libv4lconvert/ov518-decomp.c
b694b6348e035b3da880824c2c2768145c9b5199 - libv4lconvert/jpeg_memsrcdest.c
22a502c238e48f4b939c81de41feccfc7c366766 - libv4lconvert/Makefile.dGPU
60e29f95ea52df4407d771330897813cdb38340f - libv4lconvert/libv4lsyscall-priv.h
cc3f3e94a21795990610e63887c30528bde7b42e - libv4lconvert/bayer.c
72953a5a3a56b0188d35f49246356b9c8c35756c - libv4lconvert/helper.c
d6c1aba89bbcb6fef46a6f22b7ea01025435c44d - libv4lconvert/Makefile.am
ddd39b2fe0e2a86a6c64031ccc0d36edfd9b0f1a - libv4lconvert/sn9c10x.c
07f8e7c84abfbbe76d49d8bfd1f4eae6ea39a90b - libv4lconvert/jpgl.c
84c9c3812d4b5f237c8cd616d37fc1161a212acc - libv4lconvert/se401.c
fbbffd8182b4fe2e85289b6e784f70cba7ea7b1d - libv4lconvert/sq905c.c
fa751ff0f78845f3b4591396710df3b165bc8d11 - libv4lconvert/mr97310a.c
6ad4947dca51a7e67e056561cdb445d6c354d23c - libv4lconvert/libv4lconvert.c
4eff5c1a5e0b99ce4d6e9aa63645d9628467fdc3 - libv4lconvert/sn9c2028-decomp.c
5430e46abb1ac7039ed0309ca338237533ff29c9 - libv4lconvert/sn9c20x.c
3c49d99b9753208a9c1c2a9c738a1e7ad291ca22 - libv4lconvert/jpeg_memsrcdest.h
fb3344cfa8df97688332ee4fd3b17968437e8ad5 - libv4lconvert/helper-funcs.h
8b7644ac3d5c4161cfb6dcc2a34013f4c379c665 - libv4lconvert/libv4lconvert.export
be9e3bf3d7d1086b6eed0c1bf2f574c2b1737c00 - libv4lconvert/tinyjpeg.c
f08c902ecd48c2739956606b502fc0b8e4007703 - libv4lconvert/crop.c
f4d73412805f12fa08dd79a43798a7f8d7acece9 - libv4lconvert/pac207.c
25130d299463897a09e8b9adf72389dac2e89fa4 - libv4lconvert/tinyjpeg-internal.h
463725aa4dd3fecaf89c0b8bbf4747f8f7577935 - libv4lconvert/jpeg.c
725c9b8d0bfadba566cf200921e602961cb12705 - libv4lconvert/spca561-decompress.c
ff7444c48a8da88f8a466cfb138e30e585828cb3 - libv4lconvert/jl2005bcd.c
803c4d0b9364050eda163452b8792e62e221ab6d - libv4lconvert/tinyjpeg.h
cc8982bb6f753249181c715fe6430ffefc78c23b - libv4lconvert/stv0680.c
3e8e6c1fb85e3c4b58c4e9b2b0a223ddc793edcb - libv4lconvert/libv4lconvert.pc.in
033894511bd7e8a374a52486889658faa17918c4 - libv4lconvert/flip.c
f061a4e0e45ca8e0dbab630dd477e19a6c915fda - libv4lconvert/spca501.c
b2c19c2eac71d39d3fb883cdc159a69c2afa8fd6 - libv4lconvert/ov511-decomp.c
1d9c446cd8a232da87bd79acebc93e018ec72499 - libv4lconvert/jidctflt.c
1949e23fe99ccd0a05dcd084848f6d38b0af7ab6 - libv4lconvert/hm12.c
7da402829dbff238ca6ac829c037a85476185db6 - libv4lconvert/processing/autogain.c
a54c2cb0439e606af01d0b4f02704f411819d98c - libv4lconvert/processing/libv4lprocessing.c
dae9c69b7f019d7d4494cd56e2cf757e8510824a - libv4lconvert/processing/whitebalance.c
ebf12bcf99f35fb9c400b04a1439e68598268249 - libv4lconvert/processing/gamma.c
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33ab91b54108e8c24cbb80c5c335d96391d440b2 - libv4lconvert/processing/libv4lprocessing-priv.h
19a7fd04cdeba61172f281806d030472dee79fcd - libv4lconvert/control/libv4lcontrol.c
1e08fb01a598d71e3fc69656c4f2291f7dc13105 - libv4lconvert/control/libv4lcontrol.h
70f4992835e964b2698473971904375333e3659b - libv4lconvert/control/libv4lcontrol-priv.h
6feb5b2b8c99c99712dd1ea7fe9ab674d58bf86b - include/libv4l1.h
bc44111fd6b2f0374a9fc67b1b23666c5c498b2c - include/libv4l2rds.h
f751b481c4a9203345cdbb6459d0f2882f7cdbd9 - include/libv4lconvert.h
1edc439e6c0fc98513fa4a69557eb6221d043be0 - include/libv4l2.h
f2b73fa5ab10ea7038e58bd9a4461d8e16316249 - include/libv4l1-videodev.h
94434b9692371b7d5f54ddef2141d22d90079ce9 - include/libv4l-plugin.h
c84a9a115a21d1fd20da0f6ca3df7b46dd23cd2a - include/config.h
1ba874a7cad36ff31e4af3bfb37b98c05063d6b2 - include/libdvbv5/desc_event_extended.h
6bd2ed0beaf6aa4838e239198564fd8e1d20a3a1 - include/libdvbv5/desc_t2_delivery.h
92d4c28148d0b537c8afc289e1a76de68435cba0 - include/libdvbv5/dvb-scan.h
22c83d133e5c1d2648efb3028e0d89c970d0aad4 - include/libdvbv5/desc_partial_reception.h
98365b48442b9e3abb58101983b5da8c14f78289 - include/libdvbv5/dvb-v5-std.h
2f55ba765c689500401111747bb381b5aca77b30 - include/libdvbv5/desc_ca.h
100c02ce3bc364ddff895c75f4fb1f928a748d2d - include/libdvbv5/desc_cable_delivery.h
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7645dda247bcd45628afbb74ec2707a47050992e - include/libdvbv5/nit.h
30e9a7240938943de2725f2b335b19ad320179a5 - include/libdvbv5/header.h
c1212a9308d96730de547648d3cda2fc144d0e29 - include/libdvbv5/desc_atsc_service_location.h
5b4a5e7fb30a7f28118be012837e73a7151d2619 - include/libdvbv5/cat.h
2560f18846a535a2c02e1ae449511e731f11c011 - include/libdvbv5/desc_ca_identifier.h
450fab787e61210c0c5f527df92c31c90b44a113 - include/libdvbv5/desc_service.h
cabecc6d7c9fdf1c437273bd6a746bf83c156f72 - include/libdvbv5/desc_frequency_list.h
7a6093b13354d054cac78ea118a96e813cac3395 - include/libdvbv5/atsc_eit.h
9a2b20076d6728b5799096e4149e33a73119e1ef - include/libdvbv5/desc_sat.h
146f4f53fc49c66b59905249c0142efffd72fc54 - include/libdvbv5/desc_network_name.h
efa3a711499f68ae370d49d98dc1963bf6bafcd8 - include/libdvbv5/desc_extension.h
44ab16a8d4eae09690c71a6301927c1da55dda6d - include/libdvbv5/descriptors.h
c18291ff9009bfe71a2c7c6f0fce75331dc95e30 - include/libdvbv5/sdt.h
5e2dfc1d9a71805389e9a7932812695d0309050c - include/libdvbv5/dvb-frontend.h
e81b7f75c11f175cf365fc7fb535e80828f10e24 - include/libdvbv5/dvb-file.h
d7a096d51e3050c8f52e0e2111d88b71a5313da1 - include/libdvbv5/dvb-demux.h
bdf514383ca0afe981cf4fd6af86440db2dc6667 - include/libdvbv5/pat.h
b72b6d1ffcdd81e3e631c7c20bb30e5c287dc7ff - include/libdvbv5/vct.h
9b5cfad4a5f41cbf886507da6e79b07314827b32 - include/libdvbv5/desc_language.h
6e6fd4c61c1f61006c63214cbe4868d49428ddb9 - include/libdvbv5/mpeg_pes.h
188fc2cbec97288787a7f66554a4b6288224f980 - include/libdvbv5/desc_isdbt_delivery.h
73b7b0cf684de0e8a4eae49a8521f81b411d7b72 - include/libdvbv5/desc_ts_info.h
7544b5fb8f621a9c637c40d8f7a2a71f6ab4bd63 - include/libdvbv5/desc_hierarchy.h
9d523ee179af955a687662996050ee3cfaacf2ab - include/libdvbv5/crc32.h
7fb0966c6a1ccdf1a8844aed4a94d4ae1d02fcd7 - include/libdvbv5/dvb-fe.h
c8b4fc511833f0993fa740a529e1f61e0f5a216f - include/libdvbv5/mpeg_es.h
ac87e3306569dae329809f27ef227c5d50f0b60e - include/libdvbv5/desc_event_short.h
40a06b5375dbc0de88a15d26cc6c1e9a505119bc - include/libdvbv5/eit.h
ef979f3276cc3cad6e947865a42643fbba860c69 - include/libdvbv5/mgt.h
b867a2e7941d718aa64b2f6a1402322b616cb2da - include/libdvbv5/pmt.h
fb8d640da36b6a156cbe0ef12dc25468de89a2a1 - include/libdvbv5/dvb-sat.h
4c412880f0c49cd00cb16e56eed082c4744211a5 - include/libdvbv5/countries.h
ad13bfa0b1642fc72cca387e62bc193974c8d5ee - include/libdvbv5/atsc_header.h
02168c58e3c772f116f075085579ac4a8422e819 - include/libdvbv5/desc_terrestrial_delivery.h
4fe7def34ff640fc5e327b3596298169fdfe2f1c - include/libdvbv5/mpeg_ts.h
d562371bb8a3b961c4d63a0f5618453bdff4bcd3 - include/libdvbv5/dvb-log.h
2542aabb7fbff4b1a09faaadec6006c4410a6d10 - libv4l2/libv4l2-priv.h
4ba98a607592ed0b8327b387af354544c65c9b67 - libv4l2/v4l2-plugin-android.c
b89578e115fc3704f6e4c0eb73eeea844788c10e - libv4l2/Makefile
ffecae84262f548deac1da0fa51f1aba6b6f96a0 - libv4l2/Makefile.dGPU
766aaca553b0166eb736557e44ad42b69464aa53 - libv4l2/libv4l2.export
64ab87e3f0fa33ac77533c79da6284041857ff20 - libv4l2/v4l2-plugin.c
8e335567bf404eeb3d180dd384309f687f2ab944 - libv4l2/Makefile.am
2835a7389ec7591d4ff4a6d552afe7d947548608 - libv4l2/libv4l2.c
2c6d79307968536d738adf5a70109eb77aee4faf - libv4l2/log.c
cbcee4426c19c168c6f49d04af3a0b2e30c0b681 - libv4l2/libv4l2.pc.in
9d456d1772885d900865a8958c0291e13d509de5 - libv4l2/v4l2convert.c

Change-Id: If618efc63e14808fcafb6f947b8d8542cbdc4767
This commit is contained in:
svcmobrel-release
2024-09-27 12:48:57 -07:00
parent e003da6fcd
commit 4bd02cecb6
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libv4lconvert/jpgl.c Normal file
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/*
* Implementation of JPEG Lite decoding algorithm
*
* Author & Copyright (c) 2003 : Sylvain Munaut <nw8xx ]at[ 246tNt.com>
*
* v4l library adaptation: Jean-François Moine <moinejf@free.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License, version 2.1,
* as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
* Note this code was originally licensed under the GNU GPL instead of the
* GNU LGPL, its license has been changed with permission, see the permission
* mail at the end of this file.
*/
/* Original WebSite: nw802.sourceforge.net */
#include <stdlib.h>
#include "libv4lconvert-priv.h"
#define RING_QUEUE_ADVANCE_INDEX(rq,ind,n) (rq)->ind = ((rq)->ind + (n))
#define RING_QUEUE_DEQUEUE_BYTES(rq,n) RING_QUEUE_ADVANCE_INDEX(rq,ri,n)
#define RING_QUEUE_PEEK(rq,ofs) ((rq)->queue[((ofs) + (rq)->ri)])
struct RingQueue {
const unsigned char *queue;
int length;
int ri;
};
/* ============================================================================
* RingQueue bit reader
* ============================================================================
* All what is needed to read bit by nit from the RingQueue pump
* provided by usbvideo
* Critical part are macro and not functions to speed things up
* Rem: Data are read from the RingQueue as if they were 16bits Little Endian
* words. Most Significants Bits are outputed first.
*/
/* Structure used to store what we need. */
/* (We may need multiple simultaneous instance from several cam) */
struct rqBitReader {
int cur_bit;
unsigned int cur_data;
struct RingQueue *rq;
};
static inline void rqBR_init( struct rqBitReader *br, struct RingQueue *rq )
{
br->cur_bit = 16;
br->cur_data =
RING_QUEUE_PEEK( rq, 2 ) |
RING_QUEUE_PEEK( rq, 3 ) << 8 |
RING_QUEUE_PEEK( rq, 0 ) << 16 |
RING_QUEUE_PEEK( rq, 1 ) << 24 ;
RING_QUEUE_DEQUEUE_BYTES( rq, 2 );
br->rq = rq;
}
#define rqBR_peekBits(br,n) ( br->cur_data >> (32-n) )
#define rqBR_flushBits(br,n) do { \
br->cur_data <<= n; \
if ( (br->cur_bit -= n) <= 0 ) { \
br->cur_data |= \
RING_QUEUE_PEEK( br->rq, 2 ) << -br->cur_bit | \
RING_QUEUE_PEEK( br->rq, 3 ) << (8 - br->cur_bit); \
RING_QUEUE_DEQUEUE_BYTES( br->rq, 2 ); \
br->cur_bit += 16; \
} \
} while (0)
/* ============================================================================
* Real JPEG Lite stuff
* ============================================================================
*
* Precomputed tables
* Theses are computed at init time to make real-time operations faster.
* It takes some space ( about 9k ). But believe me it worth it !
*/
/* Variable Lenght Coding related tables, used for AC coefficient decoding
* TODO Check that 7 bits is enough ! */
static signed char vlcTbl_len[1<<10]; /* Meaningful bit count */
static signed char vlcTbl_run[1<<10]; /* Run */
static signed char vlcTbl_amp[1<<10]; /* Amplitude (without the sign) */
/* YUV->RGB conversion table */
static int yuvTbl_y[256];
static int yuvTbl_u1[256];
static int yuvTbl_u2[256];
static int yuvTbl_v1[256];
static int yuvTbl_v2[256];
/* Clamping table */
#define SAFE_CLAMP
#ifdef SAFE_CLAMP
static inline unsigned char clamp(int x) {
if (x > 255)
return 255;
if (x < 0)
return 0;
return x;
}
#define clamp_adjust(x) clamp(x+128)
#else
#define clamp(x) clampTbl[(x)+512]
#define clamp_adjust(x) clampTbl[(x)+640]
static char clampTbl[1280];
#endif
/* Code to initialize those tables */
static void vlcTbl_init(void)
{
/* Bases tables used to compute the bigger one
* To understands theses, look at the VLC doc in the
* US patent document. */
static const int vlc_num = 28;
static const int vlc_len[] =
{ 2, 2, 3, 3, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7,
8 ,8 ,8 ,9, 9, 9, 10, 10, 10, 10, 10, 10 };
static const int vlc_run[] =
{ 0, 0, 0, 1, 0, 2, 3, 1, 0, 4, 0, 5, 1, 0, -1, -2,
2, 6, 0, 3, 1, 0, 1, 0, 7, 2, 0, 8 };
static const int vlc_amp[] =
{ 0, 1, 2, 1, 3, 1, 1, 2, 4, 1 ,5 ,1 ,3 ,6, -1, -2,
2, 1, 7, 2, 4, 8, 5, 9, 1 ,3, 10, 1 };
static const int vlc_cod[] =
{ 0x000, 0x002, 0x003, 0x006, 0x00E, 0x008, 0x00B, 0x012,
0x014, 0x03D, 0x03E, 0x078, 0x079, 0x07E, 0x026, 0x027,
0x054, 0x057, 0x0FF, 0x0AA, 0x0AC, 0x1FC, 0x156, 0x157,
0x15A, 0x15B, 0x3FA, 0x3FB };
/* Vars */
int i,j;
/* Main filling loop */
for ( i=0 ; i<(1<<10) ; i++ ) {
/* Find the matching one */
for ( j=0 ; j<vlc_num ; j++ ) {
if ( (i >> (10-vlc_len[j])) == vlc_cod[j] ) {
if ( vlc_run[j] >= 0 )
if ( vlc_amp[j] != 0 )
vlcTbl_len[i] = vlc_len[j] + 1;
else
vlcTbl_len[i] = vlc_len[j]; /* EOB */
else
vlcTbl_len[i] = 16;
vlcTbl_run[i] = vlc_run[j];
vlcTbl_amp[i] = vlc_amp[j];
break;
}
}
}
}
static void yuvTbl_init(void)
{
/* These tables are just pre-multiplied and pre-offseted
* YUV by the book
* R = 1.164 * (Y-16) + 1.596 * (U-128)
* G = 1.164 * (Y-16) - 0.813 * (U-128) - 0.391 * (V-128)
* B = 1.164 * (Y-16) + 2.018 * (V-128) */
int i;
/* We use fixed point << 16 */
for ( i=0 ; i < 256 ; i++ ) {
yuvTbl_y[i] = 76284 * (i- 16);
yuvTbl_u1[i] = 104595 * (i-128);
yuvTbl_u2[i] = 53281 * (i-128);
yuvTbl_v1[i] = 25625 * (i-128);
yuvTbl_v2[i] = 132252 * (i-128);
}
}
#ifndef SAFE_CLAMP
static void clampTbl_init(void)
{
/* Instead of doing if(...) to test for overrange, we use
* a clamping table */
int i;
for (i=0 ; i < 512 ; i++)
clampTbl[i] = 0;
for (i=512 ; i < 768 ; i++ )
clampTbl[i] = i - 512;
for (i=768 ; i < 1280 ; i++ )
clampTbl[i] = 255;
}
#endif
/*
* Internal helpers
*/
static inline int readAC( struct rqBitReader *br, int *run, int *amp )
{
/* Vars */
unsigned int cod;
/* Get 16 bits */
cod = rqBR_peekBits(br,16);
/* Lookup in the table */
*run = vlcTbl_run[cod>>6];
*amp = vlcTbl_amp[cod>>6];
rqBR_flushBits(br,vlcTbl_len[cod>>6]);
if (*amp > 0) {
/* Normal stuff, just correct the sign */
if (cod & (0x10000 >> vlcTbl_len[cod>>6]))
*amp = - *amp;
} else {
/* Handle special cases */
if (!*amp)
return 0;
if (*amp == -1) {
/* 0100110srrraaaaa */
*run = ( cod >> 5 ) & 0x07;
*amp = ( cod & 0x100) ?
-(cod&0x1F) : (cod&0x1F);
} else {
/* 0100111srrrraaaa */
*run = ( cod >> 4 ) & 0x0F;
*amp = ( cod & 0x100) ?
-(cod&0x0F) : (cod&0x0F);
}
}
return 1;
}
#define iDCT_column(b0,b1,b2,b3) do { \
int t0,t1,t2,t3; \
\
t0 = ( b1 + b3 ) << 5; \
t2 = t0 - (b3 << 4); \
t3 = (b1 * 47) - t0; \
t0 = b0 + b2; \
t1 = b0 - b2; \
\
b0 = ( t0 + t2 ); \
b1 = ( t1 + t3 ); \
b3 = ( t0 - t2 ); \
b2 = ( t1 - t3 ); \
} while (0)
#define iDCT_line(b0,b1,b2,b3) do { \
int t0,t1,t2,t3,bm0,bm2; \
\
bm0 = b0 << 7; \
bm2 = b2 << 7; \
\
t0 = bm0 + bm2; \
t1 = bm0 - bm2; \
t2 = b1 * 183 + b3 * 86; \
t3 = b1 * 86 - b3 * 183; \
\
b0 = ( t0 + t2 ) >> 22; \
b1 = ( t1 + t3 ) >> 22; \
b3 = ( t0 - t2 ) >> 22; \
b2 = ( t1 - t3 ) >> 22; \
} while (0)
/* Decode a block
* Basic ops : get the DC - get the ACs - deZigZag - deWeighting -
* deQuantization - iDCT
* Here they are a little mixed-up to speed all this up.
*/
static inline int decodeBlock( struct rqBitReader *br, int *block, int *dc )
{
/* Tables used for block decoding */
/* deZigZag table
*
* ZigZag: each of the coefficient of the DCT transformed 4x4
* matrix is taken in a certain order to make a linear
* array with the high frequency AC at the end
*
* / 0 1 5 6 \ .
* | 2 4 7 12 | This is the order taken. We must deZigZag
* | 3 8 11 13 | to reconstitute the original matrix
* \ 9 10 14 15 /
*/
static const int iZigZagTbl[16] =
{ 0, 1, 4, 8, 5, 2, 3, 6, 9,12, 13, 10, 7, 11, 14, 15 };
/* deQuantization, deWeighting & iDCT premultiply */
/*
* Weighting : Each DCT coefficient is weighted by a certain factor. We
* must compensate for this to rebuilt the original DCT matrix.
*
* Quantization: According to the read Q factor, DCT coefficient are
* quantized. We need to compensate for this.
*
* iDCT premultiply: Since for the first iDCT pass ( column ), we'll need
* to do some multiplication, the ones that we can
* integrate here, we do.
*
* Rem: - The factors are here presented in the ZigZaged order,
* because we will need those BEFORE the deZigZag
* - For more informations, consult jpgl_tbl.c, it's the little
* prog that computes this table
*/
static const int iQWTbl[4][16] = {
{ 32768, 17808, 794, 18618, 850, 18618, 43115, 1828,
40960, 1924, 2089, 45511, 2089, 49648, 2216, 2521 },
{ 32768, 35617, 1589, 37236, 1700, 37236, 86231, 3656,
81920, 3849, 4179, 91022, 4179, 99296, 4432, 5043 },
{ 32768, 71234, 3179, 74472, 3401, 74472, 172463, 7313,
163840, 7698, 8358, 182044, 8358, 198593, 8865, 10087 },
{ 32768, 142469, 6359, 148945, 6803, 148945, 344926, 14627,
327680, 15397, 16716, 364088, 16716, 397187, 17730, 20175 }
};
/* Vars */
int hdr;
int *eff_iQWTbl;
int cc, run, amp;
/* Read & Decode the block header ( Q, T, DC ) */
hdr = rqBR_peekBits(br,11);
if (hdr & 0x100) {
/* Differential mode */
if (hdr & 0x80)
*dc += ( hdr >> 3 ) | ~0xF;
else
*dc += ( hdr >> 3 ) & 0xF;
/* Flush the header bits */
rqBR_flushBits(br,8);
} else {
/* Direct mode */
if ( hdr & 0x80 )
*dc = hdr | ~0x7F;
else
*dc = hdr & 0x7F;
/* Flush the header bits */
rqBR_flushBits(br,11);
}
/* Clear the block & store DC ( with pre-multiply ) */
block[0] = *dc << 15;
block[1] = 0x00;
block[2] = 0x00;
block[3] = 0x00;
block[4] = 0x00;
block[5] = 0x00;
block[6] = 0x00;
block[7] = 0x00;
block[8] = 0x00;
block[9] = 0x00;
block[10] = 0x00;
block[11] = 0x00;
block[12] = 0x00;
block[13] = 0x00;
block[14] = 0x00;
block[15] = 0x00;
/* Read the AC coefficients
* at the same time, deZigZag, deQuantization, deWeighting & iDCT premultiply
*/
eff_iQWTbl = (int*) iQWTbl[hdr>>9];
cc = 0;
while ( readAC(br,&run,&amp) ) {
cc += run + 1;
if ( cc > 15 )
return -1;
block[iZigZagTbl[cc]] = amp * eff_iQWTbl[cc];
}
/* Do the column iDCT ( what's left to do ) */
iDCT_column(block[0], block[4], block[8], block[12]);
iDCT_column(block[1], block[5], block[9], block[13]);
iDCT_column(block[2], block[6], block[10], block[14]);
iDCT_column(block[3], block[7], block[11], block[15]);
/* Do the line iDCT ( complete one here ) */
iDCT_line(block[0], block[1], block[2], block[3]);
iDCT_line(block[4], block[5], block[6], block[7]);
iDCT_line(block[8], block[9], block[10], block[11]);
iDCT_line(block[12], block[13], block[14], block[15]);
return !(hdr & 0x700);
}
int v4lconvert_decode_jpgl(const unsigned char *inp, int src_size,
unsigned int dest_pix_fmt, unsigned char *fb,
int img_width, int img_height)
{
/* Vars */
struct RingQueue rq;
struct rqBitReader br;
int row, col; /* Row & Column in the image */
int x,y;
int block_idx;
unsigned char *Yline_baseptr, *Uline_baseptr, *Vline_baseptr;
unsigned char *Yline, *Uline, *Vline;
int Yline_baseofs, UVline_baseofs;
int dc_y, dc_u, dc_v; /* DC Coefficients */
int block_y[16*4]; /* Y blocks */
int block_u[16]; /* U block */
int block_v[16]; /* V block */
unsigned char *mainbuffer;
int yc,uc,vc;
/* init the decoder */
if (yuvTbl_y[0] == 0) {
vlcTbl_init();
yuvTbl_init();
#ifndef SAFE_CLAMP
clampTbl_init();
#endif
}
img_height /= 4;
/* Prepare a bit-by-bit reader */
rq.queue = inp;
rq.length = src_size;
rq.ri = 0;
rqBR_init(&br, &rq);
/* Allocate a big buffer & setup pointers */
switch (dest_pix_fmt) {
default:
/* case V4L2_PIX_FMT_RGB24: */
/* case V4L2_PIX_FMT_BGR24: */
mainbuffer = malloc(4 * (img_width + (img_width >> 1) + 2));
Yline_baseptr = mainbuffer;
Uline_baseptr = mainbuffer + (4 * img_width);
Vline_baseptr = Uline_baseptr + (img_width + 4);
break;
case V4L2_PIX_FMT_YUV420:
mainbuffer = NULL;
Yline_baseptr = fb;
Uline_baseptr = fb + img_width * img_height * 16;
Vline_baseptr = Uline_baseptr + img_width * img_height * 4;
break;
case V4L2_PIX_FMT_YVU420:
mainbuffer = NULL;
Yline_baseptr = fb;
Vline_baseptr = fb + img_width * img_height * 16;
Uline_baseptr = Vline_baseptr + img_width * img_height * 4;
break;
}
Yline_baseofs = img_width - 4;
UVline_baseofs = (img_width >> 2) - 3;
/* Process 4 lines at a time ( one block height ) */
for ( row=0 ; row<img_height ; row++ ) {
/* Line start reset DC */
dc_y = dc_u = dc_v = 0;
/* Process 16 columns at a time ( 4 block width ) */
for ( col=0 ; col<img_width ; col+=16 ) {
/* Decode blocks
* Block order : Y Y Y Y V U ( Why V before U ?
* that just depends what you call U&V ... I took the
* 'by-the-book' names and that make V and then U,
* ... just ask the DivIO folks ;) )
*/
if ( decodeBlock(&br, block_y, &dc_y) && (!col) )
/* return; * Bad block, so bad frame ... */
;
decodeBlock(&br, block_y + 16, &dc_y);
decodeBlock(&br, block_y + 32, &dc_y);
decodeBlock(&br, block_y + 48, &dc_y);
decodeBlock(&br, block_v, &dc_v);
decodeBlock(&br, block_u, &dc_u);
/* Copy data to temporary buffers ( to make a complete line ) */
block_idx = 0;
Yline = Yline_baseptr + col;
Uline = Uline_baseptr + (col >> 2);
Vline = Vline_baseptr + (col >> 2);
for ( y=0 ; y<4 ; y++) {
/* Scan line */
for ( x=0 ; x<4 ; x++ ) {
/* Y block */
Yline[ 0] = clamp_adjust(block_y[block_idx ]);
Yline[ 4] = clamp_adjust(block_y[block_idx+16]);
Yline[ 8] = clamp_adjust(block_y[block_idx+32]);
Yline[12] = clamp_adjust(block_y[block_idx+48]);
/* U block */
*Uline = clamp_adjust(block_u[block_idx]);
/* V block */
*Vline = clamp_adjust(block_v[block_idx]);
/* Ajust pointers & index */
block_idx++;
Yline++;
Uline++;
Vline++;
}
/* Adjust pointers */
Yline += Yline_baseofs;
Uline += UVline_baseofs;
Vline += UVline_baseofs;
}
}
/* Handle interpolation special case ( at the end of the lines ) */
Uline = Uline_baseptr + (UVline_baseofs+2);
Vline = Vline_baseptr + (UVline_baseofs+2);
for ( y=0 ; y<4 ; y++ ) {
/* Copy the last pixel */
Uline[1] = Uline[0];
Vline[1] = Vline[0];
/* Adjust ptr */
Uline += UVline_baseofs+4;
Vline += UVline_baseofs+4;
}
/* We have 4 complete lines, so tempbuffer<YUV> -> framebuffer<RGB>
* Go line by line */
switch (dest_pix_fmt) {
case V4L2_PIX_FMT_RGB24:
Yline = Yline_baseptr;
Uline = Uline_baseptr;
Vline = Vline_baseptr;
for ( y=0 ; y<4 ; y++ ) {
/* Process 4 pixel at a time to handle interpolation
* for U & V values */
for ( x=0 ; x<img_width ; x+=4 ) {
/* First pixel */
yc = yuvTbl_y[*(Yline++)];
uc = Uline[0];
vc = Vline[0];
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
/* Second pixel */
yc = yuvTbl_y[*(Yline++)];
uc = ( 3*Uline[0] + Uline[1] ) >> 2;
vc = ( 3*Vline[0] + Vline[1] ) >> 2;
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
/* Third pixel */
yc = yuvTbl_y[*(Yline++)];
uc = ( Uline[0] + Uline[1] ) >> 1;
vc = ( Vline[0] + Vline[1] ) >> 1;
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
/* Fourth pixel */
yc = yuvTbl_y[*(Yline++)];
uc = ( Uline[0] + 3*Uline[1] ) >> 2;
vc = ( Vline[0] + 3*Vline[1] ) >> 2;
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
/* Adjust pointers */
Uline++;
Vline++;
}
/* Adjust pointers */
Uline++;
Vline++;
}
break;
case V4L2_PIX_FMT_BGR24:
Yline = Yline_baseptr;
Uline = Uline_baseptr;
Vline = Vline_baseptr;
for ( y=0 ; y<4 ; y++ ) {
/* Process 4 pixel at a time to handle interpolation
* for U & V values */
for ( x=0 ; x<img_width ; x+=4 ) {
/* First pixel */
yc = yuvTbl_y[*(Yline++)];
uc = Uline[0];
vc = Vline[0];
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
/* Second pixel */
yc = yuvTbl_y[*(Yline++)];
uc = ( 3*Uline[0] + Uline[1] ) >> 2;
vc = ( 3*Vline[0] + Vline[1] ) >> 2;
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
/* Third pixel */
yc = yuvTbl_y[*(Yline++)];
uc = ( Uline[0] + Uline[1] ) >> 1;
vc = ( Vline[0] + Vline[1] ) >> 1;
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
/* Fourth pixel */
yc = yuvTbl_y[*(Yline++)];
uc = ( Uline[0] + 3*Uline[1] ) >> 2;
vc = ( Vline[0] + 3*Vline[1] ) >> 2;
*(fb++) = clamp(( yc + yuvTbl_v2[vc] ) >> 16);
*(fb++) = clamp(( yc - yuvTbl_u2[uc] - yuvTbl_v1[vc] ) >> 16);
*(fb++) = clamp(( yc + yuvTbl_u1[uc] ) >> 16);
/* Adjust pointers */
Uline++;
Vline++;
}
/* Adjust pointers */
Uline++;
Vline++;
}
break;
case V4L2_PIX_FMT_YUV420:
case V4L2_PIX_FMT_YVU420:
Yline_baseptr += img_width * 4;
Uline_baseptr += img_width;
Vline_baseptr += img_width;
break;
}
}
/* Free our buffer */
if (mainbuffer != NULL)
free(mainbuffer);
return 0;
}
/*
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Message-ID: <4D598C7C.7080307@246tNt.com>
Date: Mon, 14 Feb 2011 21:11:40 +0100
From: Sylvain Munaut <tnt@246tNt.com>
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MIME-Version: 1.0
To: Jean-Francois Moine <moinejf@free.fr>
CC: Kjell Claesson <keyson@users.sourceforge.net>
Subject: Re: nw80x as a gspca subdriv
References: <20110209204208.4b19df88@tele> <4D53B3BF.9050908@246tNt.com> <20110214205107.18c29303@tele>
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[snip]
> May I have your permission to relicense your JPEG Lite decompression
> code under the LGPL (version 2 or later)?
Yes, sure.
"""
I hereby allow the nw80x driver code, including the jpeg lite decoding
routines, to be used and distributed under the LGPL v2 or later.
"""
[snip]
Cheers,
Sylvain
*/