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mpv/libmpcodecs/dec_teletext.c

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/*
* Teletext support
*
* Copyright (C) 2007 Vladimir Voroshilov <voroshil@gmail.com>
*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*
* Based on Attila Otvos' teletext patch, Michael Niedermayer's
* proof-of-concept teletext capture utility and some parts
* (decode_raw_line_runin,pll_add,pll_reset) of MythTV project.
* Code for calculating [soc:eoc] is based on aletv of Edgar Toernig.
*
* Teletext system is described in
* ETS 300 706 "Enhanced Teletext specification" : May 1997
* http://www.themm.net/~mihu/linux/saa7146/specs/ets_300706e01p.pdf
*
* Some implementation details:
* How to port teletext to another tvi_* driver (see tvi_v4l2.c for example):
*
* 1. Implement TVI_CONTROL_VBI_INIT (initialize driver-related vbi subsystem,
* start grabbing thread)
* input data: vbi device name.
* (driver should also call TV_VBI_CONTROL_START for common vbi subsystem initialization
* with pointer to initialized tt_stream_properties structure.
* After ioctl call variable will contain pointer to initialized priv_vbi_t structure.
*
* 2. After receiving next chunk of raw vbi data call TV_VBI_CONTROL_DECODE_PAGE
* ioctl with pointer to data buffer
* 3. pass all other VBI related ioctl cmds to teletext_control routine
*
* Page displaying process consist of following stages:
*
* ---grabbing stage---
* 0. stream/tvi_*.c: vbi_grabber(...)
* getting vbi data from video device
* ---decoding stage---
* 1. libmpcodecs/dec_teletext.c: decode_raw_line_runin(...) or decode_raw_line_sine(...)
* decode raw vbi data into sliced 45(?) bytes long packets
* 2. libmpcodecs/dec_teletext.c: decode_pkt0(...), decode_pkt_page(...)
* packets processing (header analyzing, storing complete page in cache,
* only raw member of tt_char is filled at this stage)
* 3. libmpcodecs/dec_teletext.c: decode_page(...)
* page decoding. filling unicode,gfx,ctl,etc members of tt_char structure
* with appropriate values according to teletext control chars, converting
* text to utf8.
* ---rendering stage---
* 4. libmpcodecs/dec_teletext.c: prepare_visible_page(...)
* processing page. adding number of just received by background process
* teletext page, adding current time,etc.
* 5. libvo/sub.c: vo_update_text_teletext(...)
* rendering displayable osd with text and graphics
*
* TODO:
* v4lv1,bktr support
* spu rendering
* is better quality on poor signal possible ?
* link support
* greyscale osd
* slave command for dumping pages
* fix bcd<->dec as suggested my Michael
*
* BUGS:
* wrong colors in debug dump
* blinking when visible page was just updated
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <math.h>
#include <stdio.h>
#ifdef HAVE_PTHREADS
// pthreads are needed for async updates from v4l(2)
// FIXME: try to avoid using pthread calls when running only a single
// thread as e.g. with DVB teletext
#include <pthread.h>
#else
#define pthread_mutex_init(m, p)
#define pthread_mutex_destroy(m)
#define pthread_mutex_lock(m)
#define pthread_mutex_unlock(m)
#endif
#include "dec_teletext.h"
#include "mp_msg.h"
#include "libmpcodecs/img_format.h"
#include "libavutil/common.h"
#include "input/input.h"
#include "osdep/timer.h"
//#define DEBUG_DUMP 1
/// page magazine entry structure
typedef struct mag_s{
tt_page* pt;
int order;
} mag_t;
typedef struct {
int on; ///< teletext on/off
int pagenum; ///< seek page number
int subpagenum; ///< seek subpage
int curr_pagenum; ///< current page number
int pagenumdec; ///< set page num with dec
teletext_format tformat; ///< see teletext_format enum
teletext_zoom zoom; ///< see teletext_zoom enum
mag_t* mag; ///< pages magazine (has 8 entities)
int primary_language; ///< primary character set
int secondary_language; ///< secondary character set
/// Currently displayed page (with additional info, e.g current time)
tt_char display_page[VBI_ROWS*VBI_COLUMNS];
/// number of raw bytes between two subsequent encoded bits
int bpb;
/// clock run-in sequence will be searched in buffer in [soc:eoc] bytes range
int soc;
int eoc;
/// minimum number of raw vbi bytes wich can be decoded into 8 data bits
int bp8bl;
/// maximum number of raw vbi bytes wich can be decoded into 8 data bits
int bp8bh;
int pll_adj;
int pll_dir;
int pll_cnt;
int pll_err;
int pll_lerr;
int pll_fixed;
/// vbi stream properties (buffer size,bytes per line, etc)
tt_stream_props* ptsp;
#ifdef HAVE_PTHREADS
pthread_mutex_t buffer_mutex;
#endif
tt_page** ptt_cache;
unsigned char* ptt_cache_first_subpage;
/// network info
unsigned char initialpage;
unsigned int initialsubpage;
unsigned int networkid;
int timeoffset; // timeoffset=realoffset*2
unsigned int juliandate;
unsigned int universaltime;
unsigned char networkname[21];
int cache_reset;
/// "page changed" flag: 0-unchanged, 1-entire page, 3-only header
int page_changed;
int last_rendered;
} priv_vbi_t;
static unsigned char fixParity[256];
static const tt_char tt_space={0x20,7,0,0,0,0,0,0,0x20};
static const tt_char tt_error={'?',1,0,0,0,0,0,0,'?'}; // Red '?' on black background
static double si[12];
static double co[12];
#define VBI_FORMAT(priv) (*(priv->ptsp))
#define FIXP_SH 16
#define ONE_FIXP (1<<FIXP_SH)
#define FIXP2INT(a) ((a)>>FIXP_SH)
#define ANY2FIXP(a) ((int)((a)*ONE_FIXP))
static const unsigned char corrHamm48[256]={
0x01, 0xff, 0x01, 0x01, 0xff, 0x00, 0x01, 0xff,
0xff, 0x02, 0x01, 0xff, 0x0a, 0xff, 0xff, 0x07,
0xff, 0x00, 0x01, 0xff, 0x00, 0x00, 0xff, 0x00,
0x06, 0xff, 0xff, 0x0b, 0xff, 0x00, 0x03, 0xff,
0xff, 0x0c, 0x01, 0xff, 0x04, 0xff, 0xff, 0x07,
0x06, 0xff, 0xff, 0x07, 0xff, 0x07, 0x07, 0x07,
0x06, 0xff, 0xff, 0x05, 0xff, 0x00, 0x0d, 0xff,
0x06, 0x06, 0x06, 0xff, 0x06, 0xff, 0xff, 0x07,
0xff, 0x02, 0x01, 0xff, 0x04, 0xff, 0xff, 0x09,
0x02, 0x02, 0xff, 0x02, 0xff, 0x02, 0x03, 0xff,
0x08, 0xff, 0xff, 0x05, 0xff, 0x00, 0x03, 0xff,
0xff, 0x02, 0x03, 0xff, 0x03, 0xff, 0x03, 0x03,
0x04, 0xff, 0xff, 0x05, 0x04, 0x04, 0x04, 0xff,
0xff, 0x02, 0x0f, 0xff, 0x04, 0xff, 0xff, 0x07,
0xff, 0x05, 0x05, 0x05, 0x04, 0xff, 0xff, 0x05,
0x06, 0xff, 0xff, 0x05, 0xff, 0x0e, 0x03, 0xff,
0xff, 0x0c, 0x01, 0xff, 0x0a, 0xff, 0xff, 0x09,
0x0a, 0xff, 0xff, 0x0b, 0x0a, 0x0a, 0x0a, 0xff,
0x08, 0xff, 0xff, 0x0b, 0xff, 0x00, 0x0d, 0xff,
0xff, 0x0b, 0x0b, 0x0b, 0x0a, 0xff, 0xff, 0x0b,
0x0c, 0x0c, 0xff, 0x0c, 0xff, 0x0c, 0x0d, 0xff,
0xff, 0x0c, 0x0f, 0xff, 0x0a, 0xff, 0xff, 0x07,
0xff, 0x0c, 0x0d, 0xff, 0x0d, 0xff, 0x0d, 0x0d,
0x06, 0xff, 0xff, 0x0b, 0xff, 0x0e, 0x0d, 0xff,
0x08, 0xff, 0xff, 0x09, 0xff, 0x09, 0x09, 0x09,
0xff, 0x02, 0x0f, 0xff, 0x0a, 0xff, 0xff, 0x09,
0x08, 0x08, 0x08, 0xff, 0x08, 0xff, 0xff, 0x09,
0x08, 0xff, 0xff, 0x0b, 0xff, 0x0e, 0x03, 0xff,
0xff, 0x0c, 0x0f, 0xff, 0x04, 0xff, 0xff, 0x09,
0x0f, 0xff, 0x0f, 0x0f, 0xff, 0x0e, 0x0f, 0xff,
0x08, 0xff, 0xff, 0x05, 0xff, 0x0e, 0x0d, 0xff,
0xff, 0x0e, 0x0f, 0xff, 0x0e, 0x0e, 0xff, 0x0e };
enum {
LATIN=0,
CYRILLIC1,
CYRILLIC2,
CYRILLIC3,
GREEK,
LANGS
};
// conversion table for chars 0x20-0x7F (UTF8)
// TODO: add another languages
static const unsigned int lang_chars[LANGS][0x60]={
{
//Latin
0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,
0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,
0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f,
0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,
0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,0x5f,
0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,
0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,
0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,
0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f
},
{
//Cyrillic-1 (Serbian/Croatian)
0x20,0x21,0x22,0x23,0x24,0x25,0x044b,0x27,
0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x0427,0x0410,0x0411,0x0426,0x0414,0x0415,0x0424,0x0413,
0x0425,0x0418,0x0408,0x041a,0x041b,0x041c,0x041d,0x041e,
0x041f,0x040c,0x0420,0x0421,0x0422,0x0423,0x0412,0x0403,
0x0409,0x040a,0x0417,0x040b,0x0416,0x0402,0x0428,0x040f,
0x0447,0x0430,0x0431,0x0446,0x0434,0x0435,0x0444,0x0433,
0x0445,0x0438,0x0428,0x043a,0x043b,0x043c,0x043d,0x043e,
0x043f,0x042c,0x0440,0x0441,0x0442,0x0443,0x0432,0x0423,
0x0429,0x042a,0x0437,0x042b,0x0436,0x0422,0x0448,0x042f
},
{
//Cyrillic-2 (Russian/Bulgarian)
0x20,0x21,0x22,0x23,0x24,0x25,0x044b,0x27,
0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x042e,0x0410,0x0411,0x0426,0x0414,0x0415,0x0424,0x0413,
0x0425,0x0418,0x0419,0x041a,0x041b,0x041c,0x041d,0x041e,
0x041f,0x042f,0x0420,0x0421,0x0422,0x0423,0x0416,0x0412,
0x042c,0x042a,0x0417,0x0428,0x042d,0x0429,0x0427,0x042b,
0x044e,0x0430,0x0431,0x0446,0x0434,0x0435,0x0444,0x0433,
0x0445,0x0438,0x0439,0x043a,0x043b,0x043c,0x043d,0x043e,
0x043f,0x044f,0x0440,0x0441,0x0442,0x0443,0x0436,0x0432,
0x044c,0x044a,0x0437,0x0448,0x044d,0x0449,0x0447,0x044b
},
{
//Cyrillic-3 (Ukrainian)
0x20,0x21,0x22,0x23,0x24,0x25,0xef,0x27,
0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x042e,0x0410,0x0411,0x0426,0x0414,0x0415,0x0424,0x0413,
0x0425,0x0418,0x0419,0x041a,0x041b,0x041c,0x041d,0x041e,
0x041f,0x042f,0x0420,0x0421,0x0422,0x0423,0x0416,0x0412,
0x042c,0x49,0x0417,0x0428,0x042d,0x0429,0x0427,0xcf,
0x044e,0x0430,0x0431,0x0446,0x0434,0x0435,0x0444,0x0433,
0x0445,0x0438,0x0439,0x043a,0x043b,0x043c,0x043d,0x043e,
0x043f,0x044f,0x0440,0x0441,0x0442,0x0443,0x0436,0x0432,
0x044c,0x69,0x0437,0x0448,0x044d,0x0449,0x0447,0xFF
},
{
//Greek
0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,
0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,
0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,
0x0390,0x0391,0x0392,0x0393,0x0394,0x0395,0x0396,0x0397,
0x0398,0x0399,0x039a,0x039b,0x039c,0x039d,0x039e,0x039f,
0x03a0,0x03a1,0x03a2,0x03a3,0x03a4,0x03a5,0x03a6,0x03a7,
0x03a8,0x03a9,0x03aa,0x03ab,0x03ac,0x03ad,0x03ae,0x03af,
0x03b0,0x03b1,0x03b2,0x03b3,0x03b4,0x03b5,0x03b6,0x03b7,
0x03b8,0x03b9,0x03ba,0x03bb,0x03bc,0x03bd,0x03be,0x03bf,
0x03c0,0x03c1,0x03c2,0x03c3,0x03c4,0x03c5,0x03c6,0x03c7,
0x03c8,0x03c9,0x03ca,0x03cb,0x03cc,0x03cd,0x03ce,0x03cf
}
};
/**
* Latin National Option Sub-Sets
* see Table 36 of ETS specification for details.
*
* 00: £ $ @ « ½ » ¬ # ­ ¼ ¦ ¾ ÷ English
* 01: é ï à ë ê ù î # è â ô û ç French
* 02: # ¤ É Ä Ö Å Ü _ é ä ö å ü Swedish/Finnish/Hungarian
* 03: # ů č ť ž ý í ř é á ě ú š Czech/Slovak
* 04: # $ § Ä Ö Ü ^ _ ° ä ö ü ß German
* 05: ç $ ¡ á é í ó ú ¿ ü ñ è à Portuguese/Spanish
* 06: £ $ é ° ç » ¬ # ù à ò è ì Italian
*
*/
static const unsigned int latin_subchars[8][13]={
// English
{0xa3,0x24,0x40,0xab,0xbd,0xbb,0xac,0x23,0xad,0xbc,0xa6,0xbe,0xf7},
// French
{0xe9,0xef,0xe0,0xeb,0xea,0xf9,0xee,0x23,0xe8,0xe2,0xf4,0xfb,0xe7},
// Swedish/Finnish/Hungarian
{0x23,0xa4,0xc9,0xc4,0xd6,0xc5,0xdc,0x5f,0xe9,0xe4,0xf6,0xe5,0xfc},
// Czech/Slovak
{0x23,0x16f,0x10d,0x165,0x17e,0xfd,0xed,0x159,0xe9,0xe1,0x11b,0xfa,0x161},
// German
{0x23,0x24,0xa7,0xc4,0xd6,0xdc,0x5e,0x5f,0xb0,0xe4,0xf6,0xfc,0xdf},
// Portuguese/Spanish
{0xe7,0x24,0xa1,0xe1,0xe9,0xed,0xf3,0xfa,0xbf,0xfc,0xf1,0xe8,0xe0},
// Italian
{0xa3,0x24,0xe9,0xb0,0xe7,0xbb,0xac,0x23,0xf9,0xe0,0xf2,0xe8,0xec},
// Reserved
{0x23,0x24,0x40,0x5b,0x5c,0x5d,0x5e,0x5f,0x60,0x7b,0x7c,0x7d,0x7e}
};
/**
* List of supported languages.
*
* lang_code bits for primary Language:
* bits 7-4 corresponds to bits 14-11 of 28 packet's first triplet
* bits 3-1 corresponds to bits C12-C14 of packet 0 (lang)
*
* lang_code bits for secondary Language:
* bits 7-5 corresponds to bits 3-1 of 28 packet's second triplet
* bits 4,2 corresponds to bits 18,16 of 28 packet's first triplet
* bits 3,1 corresponds to bits 15,17 of 28 packet's first triplet
*
* For details see Tables 32 and 33 of specification (subclause 15.2)
*/
struct {
unsigned char lang_code;
unsigned char charset;
const char* lang_name;
} const tt_languages[]=
{
{ 0x01, LATIN, "French"},
{ 0x02, LATIN, "Swedish/Finnish/Hungarian"},
{ 0x03, LATIN, "Czech/Slovak"},
{ 0x04, LATIN, "German"},
{ 0x05, LATIN, "Portuguese/Spanish"},
{ 0x06, LATIN, "Italian"},
{ 0x08, LATIN, "Polish"},
{ 0x09, LATIN, "French"},
{ 0x0a, LATIN, "Swedish/Finnish/Hungarian"},
{ 0x0b, LATIN, "Czech/Slovak"},
{ 0x0c, LATIN, "German"},
{ 0x0e, LATIN, "Italian"},
{ 0x10, LATIN, "English"},
{ 0x11, LATIN, "French"},
{ 0x12, LATIN, "Swedish/Finnish/Hungarian"},
{ 0x13, LATIN, "Turkish"},
{ 0x14, LATIN, "German"},
{ 0x15, LATIN, "Portuguese/Spanish"},
{ 0x16, LATIN, "Italian"},
{ 0x1d, LATIN, "Serbian/Croatian/Slovenian (Latin)"},
{ 0x20, CYRILLIC1, "Serbian/Croatian (Cyrillic)"},
{ 0x21, CYRILLIC2, "Russian, Bulgarian"},
{ 0x22, LATIN, "Estonian"},
{ 0x23, LATIN, "Czech/Slovak"},
{ 0x24, LATIN, "German"},
{ 0x25, CYRILLIC3, "Ukrainian"},
{ 0x26, LATIN, "Lettish/Lithuanian"},
{ 0x33, LATIN, "Turkish"},
{ 0x37, GREEK, "Greek"},
{ 0x40, LATIN, "English"},
{ 0x41, LATIN, "French"},
// { 0x47, ARABIC, "Arabic"},
// { 0x55, HEBREW, "Hebrew"},
// { 0x57, ARABIC, "Arabic"},
{ 0x00, LATIN, "English"},
};
/**
* \brief 24/18 Hamming code decoding
* \param data bytes with hamming code (array must be at least 3 bytes long)
* \return -1 if multiple bit error occured, D1-DI data bits - otherwise
*
* \note Bits must be correctly ordered, that is for 24/18 (lowest bit first)
* P1 P2 D1 P3 D2 D3 D4 P4 D5 D6 D7 D8 D9 DA DB P5 DC DD DE DF DG DH DI P6
*/
static int corrHamm24(unsigned char *data){
unsigned char syndrom=0;
int cw=data[0] | (data[1]<<8) | (data[2]<<16);
int i;
for(i=0;i<23;i++)
syndrom^=((cw>>i)&1)*(i+33);
syndrom^=(cw>>11)&32;
if(syndrom&31){
if(syndrom < 32 || syndrom > 55)
return -1;
cw ^= 1<<((syndrom&31)-1);
}
return (cw&4)>>2 |
(cw&0x70)>>3 |
(cw&0x3f00)>>4 |
(cw&0x3f0000)>>5;
}
/**
* \brief converts language bits to charset index
* \param lang language bits
* \return charset index in lang_chars array
*/
static int lang2charset (int lang){
int i;
for(i=0;tt_languages[i].lang_code;i++)
if(tt_languages[i].lang_code==lang)
break;
return tt_languages[i].charset;
}
/**
* \brief convert chars from curent teletext codepage into MPlayer charset
* \param p raw teletext char to decode
* \param charset index on lang_chars
* \param lang index in substitution array (latin charset only)
* \return UTF8 char
*
* \remarks
* routine will analyze raw member of given tt_char structure and
* fill unicode member of the same struct with appropriate utf8 code.
*/
static unsigned int conv2uni(unsigned int p,int charset,int lang)
{
if(p<0x80 && p>=0x20){
if(charset==LATIN){
lang&=7;
if (p>=0x23 && p<=0x24){
return latin_subchars[lang][p-0x23];
}else if (p==0x40){
return latin_subchars[lang][2];
}else if (p>=0x5b && p<=0x60){
return latin_subchars[lang][p-0x5b+3];
}else if (p>=0x7b && p<=0x7e){
return latin_subchars[lang][p-0x7b+9];
}
}
return lang_chars[charset][p-0x20];
}else
return 0x20;
}
static void init_vbi_consts(priv_vbi_t* priv){
int i,j;
double ang;
for(i=0; i<256; i++){
j=i&0x7F;
j^= j+j;
j^= j<<2;
j^= j<<4;
fixParity[i]= i ^ (j&0x80) ^ 0x80;
}
for(i=0,ang=0; i<12; i++,ang+=M_PI/priv->bpb){
si[i]= sin(ang);
co[i]= cos(ang);
}
priv->bpb=(priv->ptsp->sampling_rate/6937500.0)*ONE_FIXP+0.5;
priv->soc=FFMAX(9.2e-6*priv->ptsp->sampling_rate-priv->ptsp->offset, 0);
priv->eoc=FFMIN(12.9e-6*priv->ptsp->sampling_rate-priv->ptsp->offset,
priv->ptsp->samples_per_line-43*8*priv->bpb/ONE_FIXP);
if (priv->eoc - priv->soc<16*priv->bpb/ONE_FIXP){ // invalid [soc:eoc]
priv->soc=0;
priv->eoc=92;
}
priv->bp8bl=0.97*8*priv->bpb/ONE_FIXP; // -3% tolerance
priv->bp8bh=1.03*8*priv->bpb/ONE_FIXP; // +3% tolerance
}
/**
* \brief calculate increased/decreased by given value page number
* \param curr current page number in hexadecimal for
* \param direction decimal value (can be negative) to add to value
* of curr parameter
* \return new page number in hexadecimal form
*
* VBI page numbers are represented in special hexadecimal form, e.g.
* page with number 123 (as seen by user) internally has number 0x123.
* and equation 0x123+8 should be equal to 0x131 instead of regular 0x12b.
*
*
* Page numbers 0xYYY (where Y is not belongs to (0..9).
* Page number belongs to [0x000,0x799] or [0x100:0x899] (first 0 can be
* treated as '8')
*/
static int steppage(int p, int direction, int skip_hidden)
{
if(skip_hidden)
p=(p&15)+((p>>4)&15)*10+(p>>8)*100;
p+=direction;
if(skip_hidden){
p=(p+800)%800;
p=(p%10)+((p/10)%10)*16+(p/100)*256;
}
return p&0x7ff;
}
/*
------------------------------------------------------------------
Cache stuff
------------------------------------------------------------------
*/
/**
* \brief add/update entry in cache
* \param priv private data structure
* \param pg page to store in cache
* \param line line to update (value below 0 means update entire page)
*/
static void put_to_cache(priv_vbi_t* priv,tt_page* pg,int line){
tt_page* pgc; //page in cache
int i,j,count;
if(line<0){
i=0;
count=VBI_ROWS*VBI_COLUMNS;
}else if(line<VBI_ROWS){
i=line*VBI_COLUMNS;
count=(line+1)*VBI_COLUMNS;
}else
return;
pthread_mutex_lock(&(priv->buffer_mutex));
if(!priv->ptt_cache[pg->pagenum]){
priv->ptt_cache[pg->pagenum]=calloc(1,sizeof(tt_page));
pgc=priv->ptt_cache[pg->pagenum];
}else{
pgc=priv->ptt_cache[pg->pagenum];
while(pgc->next_subpage && pgc->subpagenum!=pg->subpagenum)
pgc=pgc->next_subpage;
if(pgc->subpagenum!=pg->subpagenum){
pgc->next_subpage=calloc(1,sizeof(tt_page));
pgc=pgc->next_subpage;
}
}
pgc->pagenum=pg->pagenum;
pgc->subpagenum=pg->subpagenum;
pgc->primary_lang=pg->primary_lang;
pgc->secondary_lang=pg->secondary_lang;
pgc->flags=pg->flags;
for(j=0;j<6;++j)
pgc->links[j]=pg->links[j];
//instead of copying entire page into cache, copy only undamaged
//symbols into cache
for(;i<count;i++){
if(!(pg->raw[i]&0x80))
pgc->raw[i]=pg->raw[i];
else
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"char error. pg:%x, c[%d]=0x%x\n",
pg->pagenum,i,pg->raw[i]);
}
pgc->active=1;
pthread_mutex_unlock(&(priv->buffer_mutex));
}
/**
* \brief get any subpage number of given page
* \param priv private data structure
* \param pagenum page number to search subpages in
*
* \return subpage number of first found subpage which belongs to
* given page number
*
* \note page itself is subpage too (and usually has subpage number 0)
*/
static inline int get_subpagenum_from_cache(priv_vbi_t* priv, int pagenum){
if (!priv->ptt_cache[pagenum])
return 0x3f7f;
else
return priv->ptt_cache[pagenum]->subpagenum;
}
/**
* \brief get page from cache by it page and subpage number
* \param priv private data structure
* \param pagenum page number
* \param subpagenum subpage number
*
* \return pointer to tt_page structure if requested page is found
* and NULL otherwise
*/
static inline tt_page* get_from_cache(priv_vbi_t* priv, int pagenum,int subpagenum){
tt_page* tp=priv->ptt_cache[pagenum];
while(tp && tp->subpagenum!=subpagenum)
tp=tp->next_subpage;
return tp;
}
/**
* \brief clears cache
* \param priv private data structure
*
* Deletes all tt_page structures from cache and frees allocated memory.
* Only zero-filled array of pointers remains in memory
*/
static void clear_cache(priv_vbi_t* priv){
int i;
tt_page* tp;
/*
Skip next 5 buffers to avoid mixing teletext pages from different
channels during channel switch
*/
priv->cache_reset=5;
for(i=0;i<VBI_MAX_PAGES;i++){
while(priv->ptt_cache[i]){
tp=priv->ptt_cache[i];
priv->ptt_cache[i]=tp->next_subpage;
free(tp);
}
}
priv->initialsubpage=priv->networkid=0;
priv->timeoffset=0;
priv->juliandate=priv->universaltime=0;
memset(priv->networkname,0,21);
}
/**
* \brief cache initialization
* \param priv private data structure
*
* \note Has to be called before any cache operations!
*/
static void init_cache(priv_vbi_t* priv){
priv->ptt_cache=calloc(VBI_MAX_PAGES,sizeof(tt_page*));
}
/**
* \brief destroys cache
* \param priv private data structure
*
* Frees all memory allocated for cache (including array of pointers).
* It is safe to call this routine multiple times
*/
static void destroy_cache(priv_vbi_t* priv){
if(priv->ptt_cache){
clear_cache(priv);
free(priv->ptt_cache);
priv->ptt_cache=NULL;
}
}
/*
------------------------------------------------------------------
Decoder stuff
------------------------------------------------------------------
*/
/**
* \brief converts raw teletext page into useful format (1st rendering stage)
* \param pg page to decode
* \param raw raw data to decode page from
* \param primary_lang primary language code
* \param secondary_lang secondary language code
*
* Routine fills tt_char structure of each teletext_page character with proper
* info about foreground and background colors, character
* type (graphics/control/text).
*/
static void decode_page(tt_char* p,unsigned char* raw,int primary_lang,int secondary_lang,int flags)
{
int row,col;
int prim_charset=lang2charset(primary_lang);
int sec_charset=lang2charset(secondary_lang);
for(row=0;row<VBI_ROWS;row++) {
int prim_lang=1;
int gfx=0;
int fg_color=7;
int bg_color=0;
int separated=0;
int conceal=0;
int hold=0;
int flash=0;
int box=0;
tt_char tt_held=tt_space;
for(col=0;col<VBI_COLUMNS;col++){
int i=row*VBI_COLUMNS+col;
int c=raw[i];
p[i].raw=c;
if(c&0x80){ //damaged char
p[i]=tt_error;
continue;
}
if((flags&TT_PGFL_SUBTITLE) || (flags&TT_PGFL_NEWFLASH))
p[i].hidden=!box;
else
p[i].hidden=0;
p[i].gfx=gfx?(separated?2:1):0;
p[i].lng=prim_lang;
p[i].ctl=(c&0x60)==0?1:0;
p[i].fg=fg_color;
p[i].bg=bg_color;
p[i].flh=flash;
if ((c&0x60)==0){ //control chars
if(c>=0x08 && c<=0x09){//Flash/Steady
flash=c==0x08;
p[i].flh=flash;
if(c==0x09){
p[i].fg=fg_color;
p[i].bg=bg_color;
}
}else if(c>=0x0a && c<=0x0b){
box=c&1;
}else if(c>=0x0c && c<=0x0f){
}else if (c<=0x17){ //colors
fg_color=c&0x0f;
gfx=c>>4;
conceal=0;
if(!gfx) hold=0;
}else if (c<=0x18){
conceal=1;
}else if (c<=0x1a){ //Contiguous/Separated gfx
separated=!(c&1);
}else if (c<=0x1b){
prim_lang=!prim_lang;
}else if (c<=0x1d){
bg_color=(c&1)?fg_color:0;
p[i].bg=bg_color;
}else{ //Hold/Release Graphics
hold=!(c&1);
}
p[i].ctl=1;
if(hold || c==0x1f){
p[i]=tt_held;
p[i].fg=fg_color;
p[i].bg=bg_color;
}else
p[i].unicode=p[i].gfx?0:' ';
continue;
}
if(conceal){
p[i].gfx=0;
p[i].unicode=' ';
}else if(gfx){
p[i].unicode=c-0x20;
if (p[i].unicode>0x3f) p[i].unicode-=0x20;
tt_held=p[i];
}else{
if(p[i].lng){
p[i].unicode=conv2uni(c,prim_charset,primary_lang&7);
}else{
p[i].unicode=conv2uni(c,sec_charset,secondary_lang&7);
}
}
p[i].fg=fg_color;
p[i].bg=bg_color;
}
}
}
/**
* \brief prepares current page for displaying
* \param priv_vbi private data structure
*
* Routine adds some useful info (time and page number of page, grabbed by
* background thread to top line of current page). Displays "No teletext"
* string if no vbi data available.
*/
#define PRINT_HEX(dp,i,h) dp[i].unicode=((h)&0xf)>9?'A'+((h)&0xf)-10:'0'+((h)&0xf)
static void prepare_visible_page(priv_vbi_t* priv){
tt_page *pg,*curr_pg;
unsigned char *p;
int i;
pthread_mutex_lock(&(priv->buffer_mutex));
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"dec_teletext: prepare_visible_page pg:0x%x, sub:0x%x\n",
priv->pagenum,priv->subpagenum);
if(priv->subpagenum==0x3f7f) //no page yet
priv->subpagenum=get_subpagenum_from_cache(priv,priv->pagenum);
pg=get_from_cache(priv,priv->pagenum,priv->subpagenum);
mp_dbg(MSGT_TELETEXT,MSGL_DBG3,"dec_teletext: prepare_vibible_page2 pg:0x%x, sub:0x%x\n",
priv->pagenum,priv->subpagenum);
curr_pg=get_from_cache(priv,priv->curr_pagenum,
get_subpagenum_from_cache(priv,priv->curr_pagenum));
if (!pg && !curr_pg){
p=_("No teletext");
for(i=0;i<VBI_COLUMNS && *p;i++){
GET_UTF8(priv->display_page[i].unicode,*p++,break;);
}
for(;i<VBI_ROWS*VBI_COLUMNS;i++)
priv->display_page[i]=tt_space;
pthread_mutex_unlock(&(priv->buffer_mutex));
return;
}
if (!pg || !pg->active){
for(i=0;i<VBI_ROWS*VBI_COLUMNS;i++){
priv->display_page[i]=tt_space;
}
}else{
decode_page(priv->display_page,pg->raw,pg->primary_lang,pg->secondary_lang,pg->flags);
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"page #%x was decoded!\n",pg->pagenum);
}
PRINT_HEX(priv->display_page,0,(priv->curr_pagenum&0x700)?priv->curr_pagenum>>8:8);
PRINT_HEX(priv->display_page,1,priv->curr_pagenum>>4);
PRINT_HEX(priv->display_page,2,priv->curr_pagenum);
priv->display_page[3].unicode=' ';
priv->display_page[4].unicode=' ';
switch(priv->pagenumdec>>12){
case 1:
priv->display_page[5].unicode='_';
priv->display_page[6].unicode='_';
PRINT_HEX(priv->display_page,7,priv->pagenumdec);
break;
case 2:
priv->display_page[5].unicode='_';
PRINT_HEX(priv->display_page,6,priv->pagenumdec>>4);
PRINT_HEX(priv->display_page,7,priv->pagenumdec);
break;
default:
PRINT_HEX(priv->display_page,5,(priv->pagenum&0x700)?priv->pagenum>>8:8);
PRINT_HEX(priv->display_page,6,priv->pagenum>>4);
PRINT_HEX(priv->display_page,7,priv->pagenum);
}
if(priv->subpagenum!=0x3f7f){
priv->display_page[8].unicode='.';
PRINT_HEX(priv->display_page,9,priv->subpagenum>>4);
PRINT_HEX(priv->display_page,10,priv->subpagenum);
}else{
priv->display_page[8].unicode=' ';
priv->display_page[9].unicode=' ';
priv->display_page[10].unicode=' ';
}
priv->display_page[11].unicode=' ';
for(i=VBI_COLUMNS;i>VBI_TIME_LINEPOS ||
((curr_pg->raw[i]&0x60) && curr_pg->raw[i]!=0x20 && i>11);
--i)
if(curr_pg->raw[i]&0x60)
priv->display_page[i].unicode=curr_pg->raw[i];
else
priv->display_page[i].unicode=' ';
pthread_mutex_unlock(&(priv->buffer_mutex));
}
/*
------------------------------------------------------------------
Renderer stuff
------------------------------------------------------------------
*/
#ifdef DEBUG_DUMP
/**
* \brief renders teletext page into given file
* \param pt page to render
* \param f opened file descriptor
* \param pagenum which page to render
* \param colored use colors not implemented yet)
*
* Text will be UTF8 encoded
*/
static void render2text(tt_page* pt,FILE* f,int colored){
int i,j;
unsigned int u;
unsigned char buf[8];
unsigned char tmp;
int pos;
tt_char dp[VBI_ROWS*VBI_COLUMNS];
int color=0;
int bkg=0;
int c1,b1;
if(!pt)
return;
fprintf(f,"+========================================+\n");
fprintf(f,"| lang:%d pagenum:0x%x subpagenum:%d flags:0x%x|\n",
pt->lang,
pt->pagenum,
pt->subpagenum,
0);
fprintf(f,"+----------------------------------------+\n");
decode_page(dp,pt->raw,pt->primary_lang,pt->secondary_lang,pt->flags);
for(i=0;i<VBI_ROWS;i++){
fprintf(f,"|");
if(colored) fprintf(f,"\033[40m");
for(j=0;j<VBI_COLUMNS;j++)
{
u=dp[i*VBI_COLUMNS+j].unicode;
if(dp[i*VBI_COLUMNS+j].fg <= 7)
c1=30+dp[i*VBI_COLUMNS+j].fg;
else
c1=38;
if(dp[i*VBI_COLUMNS+j].bg <= 7)
b1=40+dp[i*VBI_COLUMNS+j].bg;
else
b1=40;
if (b1!=bkg && colored){
fprintf(f,"\033[%dm",b1);
bkg=b1;
}
if(c1!=color && colored){
fprintf(f,"\033[%dm",c1);
color=c1;
}
if(dp[i*VBI_COLUMNS+j].gfx){
fprintf(f,"*");
}else{
pos=0;
PUT_UTF8(u,tmp,if(pos<7) buf[pos++]=tmp;);
buf[pos]='\0';
fprintf(f,"%s",buf);
}
}
if (colored) fprintf(f,"\033[0m");
color=-1;bkg=-1;
fprintf(f,"|\n");
}
//for debug
fprintf(f,"+====================raw=================+\n");
for(i=0;i<VBI_ROWS;i++){
for(j=0;j<VBI_COLUMNS;j++)
fprintf(f,"%02x ",dp[i*VBI_COLUMNS+j].raw);
fprintf(f,"\n");
}
fprintf(f,"+====================lng=================+\n");
for(i=0;i<VBI_ROWS;i++){
for(j=0;j<VBI_COLUMNS;j++)
fprintf(f,"%02x ",dp[i*VBI_COLUMNS+j].lng);
fprintf(f,"\n");
}
fprintf(f,"+========================================+\n");
}
/**
* \brief dump page into pgXXX.txt file in vurrent directory
* \param pt page to dump
*
* \note XXX in filename is page number
* \note use only for debug purposes
*/
static void dump_page(tt_page* pt)
{
FILE*f;
char name[100];
snprintf(name,99,"pg%x.txt",pt->pagenum);
f=fopen(name,"wb");
render2text(pt,f,1);
fclose(f);
}
#endif //DEBUG_DUMP
/**
* \brief checks whether page is ready and copies it into cache array if so
* \param priv private data structure
* \param magAddr page's magazine address (0-7)
*/
static void store_in_cache(priv_vbi_t* priv, int magAddr, int line){
mp_msg(MSGT_TELETEXT,MSGL_DBG2,"store_in_cache(%d): pagenum:%x\n",
priv->mag[magAddr].order,
priv->mag[magAddr].pt->pagenum);
put_to_cache(priv,priv->mag[magAddr].pt,line);
priv->curr_pagenum=priv->mag[magAddr].pt->pagenum;
#ifdef DEBUG_DUMP
dump_page(get_from_cache(priv,
priv->mag[magAddr].pt->pagenum,
priv->mag[magAddr].pt->subpagenum));
#endif
}
/*
------------------------------------------------------------------
Grabber stuff
------------------------------------------------------------------
*/
#define PLL_SAMPLES 4
#define PLL_ERROR 4
#define PLL_ADJUST 4
/**
* \brief adjust current phase for better signal decoding
* \param n count of bytes processed (?)
* \param err count of error bytes (?)
*
* \remarks code was got from MythTV project
*/
static void pll_add(priv_vbi_t* priv,int n,int err){
if(priv->pll_fixed)
return;
if(err>PLL_ERROR*2/3)
err=PLL_ERROR*2/3;
priv->pll_err+=err;
priv->pll_cnt+=n;
if(priv->pll_cnt<PLL_SAMPLES)
return;
if(priv->pll_err>PLL_ERROR)
{
if(priv->pll_err>priv->pll_lerr)
priv->pll_dir= -priv->pll_dir;
priv->pll_lerr=priv->pll_err;
priv->pll_adj+=priv->pll_dir;
if (priv->pll_adj<-PLL_ADJUST || priv->pll_adj>PLL_ADJUST)
{
priv->pll_adj=0;
priv->pll_dir=-1;
priv->pll_lerr=0;
}
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"vbi: pll_adj=%2d\n",priv->pll_adj);
}
priv->pll_cnt=0;
priv->pll_err=0;
}
/**
* \brief reset error correction
* \param priv private data structure
* \param fine_tune shift value for adjusting
*
* \remarks code was got from MythTV project
*/
static void pll_reset(priv_vbi_t* priv,int fine_tune){
priv->pll_fixed=fine_tune >= -PLL_ADJUST && fine_tune <= PLL_ADJUST;
priv->pll_err=0;
priv->pll_lerr=0;
priv->pll_cnt=0;
priv->pll_dir=-1;
priv->pll_adj=0;
if(priv->pll_fixed)
priv->pll_adj=fine_tune;
if(priv->pll_fixed)
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"pll_reset (fixed@%2d)\n",priv->pll_adj);
else
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"pll_reset (auto)\n");
}
/**
* \brief decode packet 0 (teletext page header)
* \param priv private data structure
* \param data raw teletext data (with not applied hamm correction yet)
* \param magAddr teletext page's magazine address
*
* \remarks
* data buffer was shifted by 6 and now contains:
* 0..1 page number
* 2..5 sub-code
* 6..7 control codes
* 8..39 display data
*
* only first 8 bytes protected by Hamm 8/4 code
*/
static int decode_pkt0(priv_vbi_t* priv,unsigned char* data,int magAddr)
{
int d[8];
int i,err;
if (magAddr<0 || magAddr>7)
return 0;
for(i=0;i<8;i++){
d[i]= corrHamm48[ data[i] ];
if(d[i]&0x80){
pll_add(priv,2,4);
if(priv->mag[magAddr].pt)
free(priv->mag[magAddr].pt);
priv->mag[magAddr].pt=NULL;
priv->mag[magAddr].order=0;
return 0;
}
}
if (!priv->mag[magAddr].pt)
priv->mag[magAddr].pt= malloc(sizeof(tt_page));
if(priv->primary_language)
priv->mag[magAddr].pt->primary_lang=priv->primary_language;
else
priv->mag[magAddr].pt->primary_lang= (d[7]>>1)&7;
priv->mag[magAddr].pt->secondary_lang=priv->secondary_language;
priv->mag[magAddr].pt->subpagenum=(d[2]|(d[3]<<4)|(d[4]<<8)|(d[5]<<12))&0x3f7f;
priv->mag[magAddr].pt->pagenum=(magAddr<<8) | d[0] | (d[1]<<4);
priv->mag[magAddr].pt->flags=((d[7]&1)<<7) | ((d[3]&8)<<3) | ((d[5]&12)<<2) | d[6];
memset(priv->mag[magAddr].pt->raw, 0x00, VBI_COLUMNS*VBI_ROWS);
priv->mag[magAddr].order=0;
for(i=0;i<8;i++){
priv->mag[magAddr].pt->raw[i]=0x20;
}
err=0;
for(i=8; i<VBI_COLUMNS; i++){
data[i]= fixParity[data[i]];
priv->mag[magAddr].pt->raw[i]=data[i];
if(data[i]&0x80) //Error
err++;
pll_add(priv,1,err);
}
store_in_cache(priv,magAddr,0);
return 1;
}
/**
* \brief decode teletext 8/30 Format 1 packet
* \param priv private data structure
* \param data raw teletext data (with not applied hamm correction yet)
* \param magAddr teletext page's magazine address
*
* \remarks
* packet contains:
* 0 designation code
* 1..2 initial page
* 3..6 initial subpage & magazine address
* 7..8 network id
* 9 time offset
* 10..12 julian date
* 13..15 universal time
* 20..40 network name
*
* First 7 bytes are protected by Hamm 8/4 code.
* Bytes 20-40 has odd parity check.
*
* See subcaluse 9.8.1 of specification for details
*/
static int decode_pkt30(priv_vbi_t* priv,unsigned char* data,int magAddr)
{
int d[8];
int i,err;
for(i=0;i<7;i++){
d[i]= corrHamm48[ data[i] ];
if(d[i]&0x80){
pll_add(priv,2,4);
return 0;
}
d[i]&=0xf;
}
err=0;
for(i=20; i<40; i++){
data[i]= fixParity[data[i]];
if(data[i]&0x80)//Unrecoverable error
err++;
pll_add(priv,1,err);
}
if (err) return 0;
if (d[0]&0xe) //This is not 8/30 Format 1 packet
return 1;
priv->initialpage=d[1] | d[2]<<4 | (d[6]&0xc)<<7 | (d[4]&1)<<8;
priv->initialsubpage=d[3] | d[4]<<4 | d[5]<<8 | d[6]<<12;
priv->networkid=data[7]<<8 | data[8];
priv->timeoffset=(data[9]>>1)&0xf;
if(data[9]&0x40)
priv->timeoffset=-priv->timeoffset;
priv->juliandate=(data[10]&0xf)<<16 | data[11]<<8 | data[12];
priv->juliandate-=0x11111;
priv->universaltime=data[13]<<16 | data[14]<<8 | data[15];
priv->universaltime-=0x111111;
snprintf(priv->networkname,21,"%s",data+20);
return 1;
}
/**
* \brief decode packets 1..24 (teletext page header)
* \param priv private data structure
* \param data raw teletext data
* \param magAddr teletext page's magazine address
* \param rowAddr teletext page's row number
*
* \remarks
* data buffer was shifted by 6 and now contains 40 bytes of display data:
* this type of packet is not proptected by Hamm 8/4 code
*/
static void decode_pkt_page(priv_vbi_t* priv,unsigned char*data,int magAddr,int rowAddr){
int i,err;
if (!priv->mag[magAddr].pt)
return;
priv->mag[magAddr].order=rowAddr;
err=0;
for(i=0; i<VBI_COLUMNS; i++){
data[i]= fixParity[ data[i] ];
priv->mag[magAddr].pt->raw[i+rowAddr*VBI_COLUMNS]=data[i];
if( data[i]&0x80) //HammError
err++;
}
pll_add(priv,1,err);
store_in_cache(priv,magAddr,rowAddr);
}
/**
* \brief decode packets 27 (teletext links)
* \param priv private data structure
* \param data raw teletext data
* \param magAddr teletext page's magazine address
*/
static int decode_pkt27(priv_vbi_t* priv,unsigned char* data,int magAddr){
int i,hpg;
if (!priv->mag[magAddr].pt)
return 0;
for(i=0;i<38;++i)
if ((data[i] = corrHamm48[ data[i] ]) & 0x80){
pll_add(priv,2,4);
return 0;
}
/*
Not a X/27/0 Format 1 packet or
flag "show links on row 24" is not set.
*/
if (data[0] || !(data[37] & 8))
return 1;
for(i=0;i<6;++i) {
hpg = (magAddr<<8) ^ ((data[4+i*6]&0x8)<<5 | (data[6+i*6]&0xc)<<7);
if (!hpg) hpg=0x800;
priv->mag[magAddr].pt->links[i].pagenum = (data[1+i*6] & 0xf) |
((data[2+i*6] & 0xf) << 4) | hpg;
priv->mag[magAddr].pt->links[i].subpagenum = ((data[3+i*6] & 0xf) |
(data[4+i*6] & 0xf) << 4 | (data[5+i*6] & 0xf) << 8 |
(data[6+i*6] & 0xf) << 12) & 0x3f7f;
}
put_to_cache(priv,priv->mag[magAddr].pt,-1);
return 1;
}
/**
* \brief Decode teletext X/28/0 Format 1 packet
* \param priv private data structure
* \param data raw teletext data
*
* Primary G0 charset is transmitted in bits 14-8 of Triplet 1
* See Table 32 of specification for details.
*
* Secondary G0 charset is transmitted in bits 3-1 of Triplet 2 and
* bits 18-15 of Triplet 1
* See Table 33 of specification for details.
*
*/
static void decode_pkt28(priv_vbi_t* priv,unsigned char*data){
int d;
int t1,t2;
d=corrHamm48[ data[0] ];
if(d) return; //this is not X/28/0 Format 1 packet or error occured
t1=corrHamm24(data+1);
t2=corrHamm24(data+4);
if (t1<0 || t2<0){
pll_add(priv,1,4);
return;
}
priv->primary_language=(t1>>7)&0x7f;
priv->secondary_language=((t2<<4) | (t1>>14))&0x7f;
if (priv->secondary_language==0x7f)
//No secondary language required
priv->secondary_language=priv->primary_language;
else // Swapping bits 1 and 3
priv->secondary_language=(priv->secondary_language&0x7a) |
(priv->secondary_language&4)>>2 |
(priv->secondary_language&1)<<2;
mp_msg(MSGT_TELETEXT,MSGL_DBG2,"pkt28: language: primary=%02x secondary=0x%02x\n",
priv->primary_language,priv->secondary_language);
}
/**
* \brief decodes raw vbi data (signal amplitudes) into sequence of bytes
* \param priv private data structure
* \param buf raw vbi data (one line of frame)
* \param data output buffer for decoded bytes (at least 45 bytes long)
*
* Used XawTV's algorithm. Signal phase is calculated with help of starting clock
* run-in sequence (min/max values and bit distance values are calculated)
*/
static int decode_raw_line_runin(priv_vbi_t* priv,unsigned char* buf,unsigned char* data){
const int magic= 0x27; // reversed 1110010
int dt[256],hi[6],lo[6];
int i,x,r;
int decoded;
int sync;
unsigned char min,max;
int thr=0; //threshold
//stubs
int soc=priv->soc;
int eoc=priv->eoc;
for(i=soc;i<eoc;i++)
dt[i]=buf[i+priv->bpb/ONE_FIXP]-buf[i]; // amplifies the edges best.
/* set barrier */
for (i=eoc; i<eoc+16; i+=2)
dt[i]=100, dt[i+1]=-100;
/* find 6 rising and falling edges */
for (i=soc, x=0; x<6; ++x)
{
while (dt[i]<32)
i++;
hi[x]=i;
while (dt[i]>-32)
i++;
lo[x]=i;
}
if (i>=eoc)
{
return 0; // not enough periods found
}
i=hi[5]-hi[1]; // length of 4 periods (8 bits)
if (i<priv->bp8bl || i>priv->bp8bh)
{
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"vbi: wrong freq %d (%d,%d)\n",
i,priv->bp8bl,priv->bp8bh);
return 0; // bad frequency
}
/* AGC and sync-reference */
min=255, max=0, sync=0;
for (i=hi[4]; i<hi[5]; ++i)
if (buf[i]>max)
max=buf[i], sync=i;
for (i=lo[4]; i<lo[5]; ++i)
if (buf[i]<min)
min=buf[i];
thr=(min+max)/2;
buf+=sync;
// searching for '11'
for(i=priv->pll_adj*priv->bpb/10;i<16*priv->bpb;i+=priv->bpb)
if(buf[FIXP2INT(i)]>thr && buf[FIXP2INT(i+priv->bpb)]>thr)
break;
r=0;
for(decoded=1; decoded<= (VBI_COLUMNS+3)<<3;decoded++){
r>>=1;
if(buf[FIXP2INT(i)]>thr) r|=0x80;
if(!(decoded & 0x07)){
data[(decoded>>3) - 1]=r;
r=0;
}
i+=priv->bpb;
}
if(data[0]!=magic)
return 0; //magic not found
//stub
for(i=0;i<43;i++){
data[i]=data[i+1];
}
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"thr:%d sync:%d ",thr,sync);
return 1;
}
#if 0
//See comment in vbi_decode for a reason of commenting out this routine.
/**
* \brief decodes raw vbi data (signal amplitudes) into sequence of bytes
* \param priv private data structure
* \param buf raw vbi data (one line of frame)
* \param data output buffer for decoded bytes (at least 45 bytes long)
*
* Used Michael Niedermayer's algorithm.
* Signal phase is calculated using correlation between given samples data and
* pure sine
*/
static int decode_raw_line_sine(priv_vbi_t* priv,unsigned char* buf,unsigned char* data){
int i,x,r,amp,xFixp;
int avg=0;
double sin_sum=0, cos_sum=0;
for(x=0; x< FIXP2INT(10*priv->bpb); x++)
avg+=buf[x];
avg/=FIXP2INT(10*priv->bpb);
for(x=0; x<12; x++){
amp= buf[x<<1];
sin_sum+= si[x]*(amp-avg);
cos_sum+= co[x]*(amp-avg);
}
//this is always zero. Why ?
xFixp= atan(sin_sum/cos_sum)*priv->bpb/M_PI;
//Without this line the result is full of errors
//and routine is unable to find magic sequence
buf+=FIXP2INT(10*priv->bpb);
r=0;
for(x=FIXP2INT(xFixp);x<70;x=FIXP2INT(xFixp)){
r=(r<<1) & 0xFFFF;
if(buf[x]>avg) r|=1;
xFixp+=priv->bpb;
if(r==0xAAE4) break;
}
//this is not teletext
if (r!=0xaae4) return 0;
//Decode remaining 45-2(clock run-in)-1(framing code)=42 bytes
for(i=1; i<=(42<<3); i++){
r>>=1;
x=FIXP2INT(xFixp);
if(buf[x]> avg)
r|=0x80;
if(!(i & 0x07)){
data[(i>>3)-1]=r;
r=0;
}
xFixp+=priv->bpb;
}
return 1;
}
#endif
/**
* \brief decodes one vbi line from one video frame
* \param priv private data structure
* \param data buffer with raw vbi data in it
*/
static void vbi_decode_line(priv_vbi_t *priv, unsigned char *data) {
int d0,d1,magAddr,pkt;
d0= corrHamm48[ data[0] ];
d1= corrHamm48[ data[1] ];
if(d0&0x80 || d1&0x80){
pll_add(priv,2,4);
mp_msg(MSGT_TELETEXT,MSGL_V,"vbi_decode_line: HammErr\n");
return; //hamError
}
magAddr=d0 & 0x7;
pkt=(d0>>3)|(d1<<1);
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"vbi_decode_line:%x %x (mag:%x, pkt:%d)\n",
d0,d1,magAddr,pkt);
if(!pkt){
decode_pkt0(priv,data+2,magAddr); //skip MRGA
}else if(pkt>0 && pkt<VBI_ROWS){
if(!priv->mag[magAddr].pt)
return;
decode_pkt_page(priv,data+2,magAddr,pkt);//skip MRGA
}else if(pkt==27) {
decode_pkt27(priv,data+2,magAddr);
}else if(pkt==28){
decode_pkt28(priv,data+2);
}else if(pkt==30){
decode_pkt30(priv,data+2,magAddr);
} else {
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"unsupported packet:%d\n",pkt);
}
}
/**
* \brief decodes all vbi lines from one video frame
* \param priv private data structure
* \param buf buffer with raw vbi data in it
*
* \note buffer size have to be at least priv->ptsp->bufsize bytes
*/
static void vbi_decode(priv_vbi_t* priv,unsigned char*buf){
unsigned char data[64];
unsigned char* linep;
int i=0;
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"vbi: vbi_decode\n");
for(linep=buf; !priv->cache_reset && linep<buf+priv->ptsp->bufsize; linep+=priv->ptsp->samples_per_line,i++){
#if 0
/*
This routine is alternative implementation of raw VBI data decoding.
Unfortunately, it detects only about 20% of incoming data,
but Michael says that this algorithm is better, and he wants to fix it.
*/
if(decode_raw_line_sine(priv,linep,data)<=0){
#endif
if(decode_raw_line_runin(priv,linep,data)<=0){
continue; //this is not valid teletext line
}
vbi_decode_line(priv, data);
}
if (priv->cache_reset){
pthread_mutex_lock(&(priv->buffer_mutex));
priv->cache_reset--;
pthread_mutex_unlock(&(priv->buffer_mutex));
}
}
/**
* \brief decodes a vbi line from a DVB teletext stream
* \param priv private data structure
* \param buf buffer with DVB teletext data
*
* No locking is done since this is only called from a single-threaded context
*/
static void vbi_decode_dvb(priv_vbi_t *priv, const uint8_t buf[44]){
int i;
uint8_t data[42];
mp_msg(MSGT_TELETEXT,MSGL_DBG3, "vbi: vbi_decode_dvb\n");
/* Reverse bit order, skipping the first two bytes (field parity, line
offset and framing code). */
for (i = 0; i < sizeof(data); i++)
data[i] = av_reverse[buf[2 + i]];
vbi_decode_line(priv, data);
if (priv->cache_reset)
priv->cache_reset--;
}
/*
---------------------------------------------------------------------------------
Public routines
---------------------------------------------------------------------------------
*/
/**
* \brief toggles teletext page displaying format
* \param priv_vbi private data structure
* \param flag new format
* \return
* VBI_CONTROL_TRUE is success,
* VBI_CONTROL_FALSE otherwise
*
* flag:
* 0 - opaque
* 1 - transparent
* 2 - opaque with black foreground color (only in bw mode)
* 3 - transparent with black foreground color (only in bw mode)
*/
static int teletext_set_format(priv_vbi_t * priv, teletext_format flag)
{
flag&=3;
mp_msg(MSGT_TELETEXT,MSGL_DBG3,"teletext_set_format_is called. mode:%d\n",flag);
pthread_mutex_lock(&(priv->buffer_mutex));
priv->tformat=flag;
priv->pagenumdec=0;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
}
/**
* \brief append just entered digit to editing page number
* \param priv_vbi private data structure
* \param dec decimal digit to append
*
* dec:
* '0'..'9' append digit
* '-' remove last digit (backspace emulation)
*
* This routine allows user to jump to arbitrary page.
* It implements simple page number editing algorithm.
*
* Subsystem can be on one of two modes: normal and page number edit mode.
* Zero value of priv->pagenumdec means normal mode
* Non-zero value means page number edit mode and equals to packed
* decimal number of already entered part of page number.
*
* How this works.
* Let's assume that current mode is normal (pagenumdec is zero), teletext page
* 100 are displayed as usual. topmost left corner of page contains page number.
* Then vbi_add_dec is sequentially called (through slave
* command of course) with 1,4,-,2,3 * values of dec parameter.
*
* +-----+------------+------------------+
* | dec | pagenumdec | displayed number |
* +-----+------------+------------------+
* | | 0x000 | 100 |
* +-----+------------+------------------+
* | 1 | 0x001 | __1 |
* +-----+------------+------------------+
* | 4 | 0x014 | _14 |
* +-----+------------+------------------+
* | - | 0x001 | __1 |
* +-----+------------+------------------+
* | 2 | 0x012 | _12 |
* +-----+------------+------------------+
* | 3 | 0x123 | 123 |
* +-----+------------+------------------+
* | | 0x000 | 123 |
* +-----+------------+------------------+
*
* pagenumdec will automatically receive zero value after third digit of page
* number is entered and current page will be switched to another one with
* entered page number.
*/
static void vbi_add_dec(priv_vbi_t * priv, char *dec)
{
int count, shift;
if (!dec)
return;
if (!priv->on)
return;
if ((*dec<'0' || *dec>'9') && *dec!='-')
return;
if (!priv->pagenumdec) //first digit cannot be '0','9' or '-'
if(*dec=='-' || *dec=='0' || *dec=='9')
return;
pthread_mutex_lock(&(priv->buffer_mutex));
count=(priv->pagenumdec>>12)&0xf;
if (*dec=='-') {
count--;
if (count)
priv->pagenumdec=((priv->pagenumdec>>4)&0xfff)|(count<<12);
else
priv->pagenumdec=0;
} else {
shift = count * 4;
count++;
priv->pagenumdec=
(((priv->pagenumdec)<<4|(*dec-'0'))&0xfff)|(count<<12);
if (count==3) {
priv->pagenum=priv->pagenumdec&0x7ff;
priv->subpagenum=get_subpagenum_from_cache(priv,priv->pagenum);
priv->pagenumdec=0;
}
}
pthread_mutex_unlock(&(priv->buffer_mutex));
}
/**
* \brief Teletext control routine
* \param priv_vbi private data structure
* \param cmd command
* \param arg command parameter (has to be not null)
*/
int teletext_control(void* p, int cmd, void *arg)
{
int fine_tune=99;
priv_vbi_t* priv=(priv_vbi_t*)p;
tt_page* pgc;
if (!priv && cmd!=TV_VBI_CONTROL_START)
return VBI_CONTROL_FALSE;
if (!arg && cmd!=TV_VBI_CONTROL_STOP && cmd!=TV_VBI_CONTROL_MARK_UNCHANGED)
return VBI_CONTROL_FALSE;
switch (cmd) {
case TV_VBI_CONTROL_RESET:
{
int i;
struct tt_param* tt_param=arg;
pthread_mutex_lock(&(priv->buffer_mutex));
priv->pagenumdec=0;
clear_cache(priv);
priv->pagenum=steppage(0,tt_param->page&0x7ff,1);
priv->tformat=tt_param->format;
priv->subpagenum=0x3f7f;
pll_reset(priv,fine_tune);
if(tt_param->lang==-1){
mp_tmsg(MSGT_TELETEXT,MSGL_INFO,"Supported Teletext languages:\n");
for(i=0; tt_languages[i].lang_code; i++){
mp_msg(MSGT_TELETEXT,MSGL_INFO," %3d %s\n",
tt_languages[i].lang_code, tt_languages[i].lang_name);
}
mp_msg(MSGT_TELETEXT,MSGL_INFO," %3d %s\n",
tt_languages[i].lang_code, tt_languages[i].lang_name);
}else{
for(i=0; tt_languages[i].lang_code; i++){
if(tt_languages[i].lang_code==tt_param->lang)
break;
}
if (priv->primary_language!=tt_languages[i].lang_code){
mp_tmsg(MSGT_TELETEXT,MSGL_INFO,"Selected default teletext language: %s\n",
tt_languages[i].lang_name);
priv->primary_language=tt_languages[i].lang_code;
}
}
priv->page_changed=1;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
}
case TV_VBI_CONTROL_START:
{
int i;
tt_stream_props* ptsp=*(tt_stream_props**)arg;
if(!ptsp)
return VBI_CONTROL_FALSE;
priv=calloc(1,sizeof(priv_vbi_t));
priv->ptsp=malloc(sizeof(tt_stream_props));
memcpy(priv->ptsp,ptsp,sizeof(tt_stream_props));
*(priv_vbi_t**)arg=priv;
priv->subpagenum=0x3f7f;
pthread_mutex_init(&priv->buffer_mutex, NULL);
priv->pagenumdec=0;
for(i=0;i<VBI_ROWS*VBI_COLUMNS;i++)
priv->display_page[i]=tt_space;
priv->mag=calloc(8,sizeof(mag_t));
init_cache(priv);
init_vbi_consts(priv);
pll_reset(priv,fine_tune);
priv->page_changed=1;
return VBI_CONTROL_TRUE;
}
case TV_VBI_CONTROL_STOP:
{
if(priv->mag)
free(priv->mag);
if(priv->ptsp)
free(priv->ptsp);
destroy_cache(priv);
priv->page_changed=1;
pthread_mutex_destroy(&priv->buffer_mutex);
free(priv);
return VBI_CONTROL_TRUE;
}
case TV_VBI_CONTROL_SET_MODE:
priv->on=(*(int*)arg%2);
priv->page_changed=1;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_GET_MODE:
*(int*)arg=priv->on;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_SET_FORMAT:
priv->page_changed=1;
return teletext_set_format(priv, *(int *) arg);
case TV_VBI_CONTROL_GET_FORMAT:
pthread_mutex_lock(&(priv->buffer_mutex));
*(int*)arg=priv->tformat;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_GET_HALF_PAGE:
if(!priv->on)
return VBI_CONTROL_FALSE;
*(int *)arg=priv->zoom;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_SET_HALF_PAGE:
{
int val=*(int*)arg;
val%=3;
if(val<0)
val+=3;
pthread_mutex_lock(&(priv->buffer_mutex));
priv->zoom=val;
priv->page_changed=1;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
}
case TV_VBI_CONTROL_GO_LINK:
{
int val=*(int *) arg;
if(val<1 || val>6)
return VBI_CONTROL_FALSE;
pthread_mutex_lock(&(priv->buffer_mutex));
if (!(pgc = priv->ptt_cache[priv->pagenum])) {
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_FALSE;
}
if (!pgc->links[val-1].pagenum || pgc->links[val-1].pagenum>0x7ff) {
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_FALSE;
}
priv->pagenum=pgc->links[val-1].pagenum;
if(pgc->links[val-1].subpagenum!=0x3f7f)
priv->subpagenum=pgc->links[val-1].subpagenum;
else
priv->subpagenum=get_subpagenum_from_cache(priv,priv->pagenum);
priv->page_changed=1;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
}
case TV_VBI_CONTROL_SET_PAGE:
{
int val=*(int *) arg;
if(val<100 || val>0x899)
return VBI_CONTROL_FALSE;
pthread_mutex_lock(&(priv->buffer_mutex));
priv->pagenum=val&0x7ff;
priv->subpagenum=get_subpagenum_from_cache(priv,priv->pagenum);
priv->pagenumdec=0;
priv->page_changed=1;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
}
case TV_VBI_CONTROL_STEP_PAGE:
{
int direction=*(int *) arg;
pthread_mutex_lock(&(priv->buffer_mutex));
priv->pagenum=steppage(priv->pagenum, direction,1);
priv->subpagenum=get_subpagenum_from_cache(priv,priv->pagenum);
priv->pagenumdec=0;
priv->page_changed=1;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
}
case TV_VBI_CONTROL_GET_PAGE:
*(int*)arg=((priv->pagenum+0x700)&0x7ff)+0x100;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_SET_SUBPAGE:
pthread_mutex_lock(&(priv->buffer_mutex));
priv->pagenumdec=0;
priv->subpagenum=*(int*)arg;
if(priv->subpagenum<0)
priv->subpagenum=0x3f7f;
if(priv->subpagenum>=VBI_MAX_SUBPAGES)
priv->subpagenum=VBI_MAX_SUBPAGES-1;
priv->page_changed=1;
pthread_mutex_unlock(&(priv->buffer_mutex));
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_GET_SUBPAGE:
*(int*)arg=priv->subpagenum;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_ADD_DEC:
vbi_add_dec(priv, *(char **) arg);
priv->page_changed=1;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_DECODE_PAGE:
vbi_decode(priv,*(unsigned char**)arg);
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_DECODE_DVB:
vbi_decode_dvb(priv, arg);
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_GET_VBIPAGE:
if(!priv->on)
return VBI_CONTROL_FALSE;
prepare_visible_page(priv);
*(void **)arg=priv->display_page;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_GET_NETWORKNAME:
*(void **)arg=priv->networkname;
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_MARK_UNCHANGED:
priv->page_changed=0;
priv->last_rendered=GetTimerMS();
return VBI_CONTROL_TRUE;
case TV_VBI_CONTROL_IS_CHANGED:
if(GetTimerMS()-priv->last_rendered> 250) //forcing page update every 1/4 sec
priv->page_changed=3; //mark that header update is enough
*(int*)arg=priv->page_changed;
return VBI_CONTROL_TRUE;
}
return VBI_CONTROL_UNKNOWN;
}
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