/*
* DVB subtitle encoding
* Copyright (c) 2005 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "libavutil/colorspace.h"
#include <Imlib2.h>
#include "txt0.h"
#include "txt1.h"
#include "txt2.h"
static uint8_t paritytab[] = {
0x80, 0x01, 0x02, 0x83, 0x04, 0x85, 0x86, 0x07,
0x08, 0x89, 0x8a, 0x0b, 0x8c, 0x0d, 0x0e, 0x8f,
0x10, 0x91, 0x92, 0x13, 0x94, 0x15, 0x16, 0x97,
0x98, 0x19, 0x1a, 0x9b, 0x1c, 0x9d, 0x9e, 0x1f,
0x20, 0xa1, 0xa2, 0x23, 0xa4, 0x25, 0x26, 0xa7,
0xa8, 0x29, 0x2a, 0xab, 0x2c, 0xad, 0xae, 0x2f,
0xb0, 0x31, 0x32, 0xb3, 0x34, 0xb5, 0xb6, 0x37,
0x38, 0xb9, 0xba, 0x3b, 0xbc, 0x3d, 0x3e, 0xbf,
0x40, 0xc1, 0xc2, 0x43, 0xc4, 0x45, 0x46, 0xc7,
0xc8, 0x49, 0x4a, 0xcb, 0x4c, 0xcd, 0xce, 0x4f,
0xd0, 0x51, 0x52, 0xd3, 0x54, 0xd5, 0xd6, 0x57,
0x58, 0xd9, 0xda, 0x5b, 0xdc, 0x5d, 0x5e, 0xdf,
0xe0, 0x61, 0x62, 0xe3, 0x64, 0xe5, 0xe6, 0x67,
0x68, 0xe9, 0xea, 0x6b, 0xec, 0x6d, 0x6e, 0xef,
0x70, 0xf1, 0xf2, 0x73, 0xf4, 0x75, 0x76, 0xf7,
0xf8, 0x79, 0x7a, 0xfb, 0x7c, 0xfd, 0xfe, 0x7f,
};
static uint8_t ham84tab[] = {
0x15, 0x02, 0x49, 0x5e, 0x64, 0x73, 0x38, 0x2f,
0xd0, 0xc7, 0x8c, 0x9b, 0xa1, 0xb6, 0xfd, 0xea,
};
static uint8_t invtab[] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};
typedef struct TexAttr {
uint8_t xpos;
uint8_t ypos;
uint8_t bk_color;
uint8_t ft_color;
} TexAttr;
typedef struct SubClut {
uint32_t clut4[4];
uint32_t clut16[16];
uint32_t clut256[256];
} SubClut;
typedef union Pixel32 {
uint32_t integer;
struct {
uint8_t b, g, r, a;/*for LITTLE_ENDIAN*/
}color;
} Pixel32;
typedef struct DVBSubtitleContext {
AVClass *class;
/*
* type = image, image file's path and image file's suffix
* */
char * imagepath;
char * imagesuffix;
/*
* type = ass
* */
char * fontpath;
char * font;
uint64_t fontinteger;
int fontalpha;
uint64_t borderinteger;
int borderalpha;
char * sub_align;
int sub_pos;
int nb_colors;
Pixel32 fontcolor;
Pixel32 bordercolor;
Imlib_Font fn;
/*
* the common variable
* */
int hide_state;
int object_version;
SubClut clut;
} DVBSubtitleContext;
static int get_head_len(const char * ass)
{
int head_len = 0;
int count = 0;
while(*ass != '\0') {
head_len++;
if(*ass == ',')
count++;
if(count == 3)
break;
ass++;
}
if(count == 3)
return head_len;
else
return -1;
}
static void invert_data(uint8_t *q, uint8_t len)
{
uint8_t i;
for(i = 0; i < len; i++) *q++ = invtab[*q];
}
static int encode_magazine_packet_number(uint8_t *q, uint8_t mag, uint8_t nr)
{
uint8_t m, n;
m = (mag | ((nr & 0x01) << 3)) & 0x0f;
n = (nr >> 1) & 0x0f;
*q++ = ham84tab[m];
*q++ = ham84tab[n];
return 2;
}
static int encode_page_header(uint8_t *q, uint8_t* pageno, uint8_t *subcode, uint8_t* ctrlbits)
{
*q++ = ham84tab[pageno[0] & 0x0f];
*q++ = ham84tab[pageno[1] & 0x0f];
*q++ = ham84tab[subcode[0] & 0x0f];
*q++ = ham84tab[(subcode[1] | (ctrlbits[0] << 3)) & 0x0f]; // C4
*q++ = ham84tab[subcode[2] & 0x0f];
*q++ = ham84tab[(subcode[3] | (ctrlbits[1] << 2)) & 0x0f]; // C5 c6
*q++ = ham84tab[ctrlbits[2] & 0x0f]; // C7 C8 C9 C10
*q++ = ham84tab[ctrlbits[3] & 0x0f]; // C11 C12 C13 C14
return 8;
}
static int encode_page_header_data(uint8_t *q, TexAttr *attr, uint8_t *buff, uint8_t len)
{
uint8_t i, j, charlen = 0;
*q++ = paritytab[buff[0]];
*q++ = paritytab[buff[1]];
*q++ = paritytab[buff[2]];
*q++ = paritytab[0x20];
*q++ = paritytab[0x07];
charlen = len - 5;
charlen = FFMIN(strlen(buff) - 3, charlen);
for(i = 5, j = 3; i < len; i++) {
if(i >= charlen) *q++ = paritytab[0x20];
else *q++ = paritytab[buff[j++]];
}
return len;
}
static int encode_data_block(uint8_t *q, TexAttr *attr, uint8_t *buff, uint8_t len)
{
uint8_t i, charlen = 0, clrlen = 0, spos = 0;
charlen = len;
if(len < 40) {
*q++ = paritytab[buff[0]];
*q++ = paritytab[buff[1]];
*q++ = paritytab[buff[2]];
*q++ = paritytab[buff[3]];
charlen -= 4;
spos = 4;
}
*q++ = paritytab[attr->ft_color];
charlen -= 1;
clrlen += 1;
charlen = FFMIN(strlen(buff), charlen);
for(i = spos; i < len - clrlen; i++) {
if(i >= charlen) *q++ = paritytab[0x20];
else *q++ = paritytab[buff[i]];
}
return len;
}
static int encode_data_block2(uint8_t *q, TexAttr *attr, uint8_t *buff, uint8_t len)
{
uint8_t i;
for(i = 0; i < len; i++) {
*q++ = paritytab[buff[i]];
}
return len;
}
static int encode_dvb_teletext(DVBSubtitleContext *s, uint8_t *outbuf, AVSubtitle *h)
{
int i = 0, head_len = 0;
static int m = 0;
uint8_t *q;
uint8_t rfl = 0x27;
int mag, nr;
int rows;
int padding = 0, len, size;
static uint8_t pageno[2], subcode[4], ctrlbits[4];
static uint32_t ncount = 0;
q = outbuf;
*q++ = 0x10; // data identifier
rows = FFMIN(h->num_rects, 24);
subcode[0] = 0;
subcode[0] %= 16;
subcode[1] = 0;
subcode[1] %= 8;
subcode[2] = 0;
subcode[2] %= 16;
subcode[3] = 0;
subcode[3] %= 4;
ctrlbits[0] = 0x00; // C4, Erase Page
ctrlbits[1] = 0x00; // C5, C6
ctrlbits[2] = 0x04; // C7, C8, C9, C10
ctrlbits[3] = 0x0d; // C11, C12, C13, C14, character subset, italian
for(i = 0; i < rows; i++) {
char *text;
TexAttr attr;
head_len = get_head_len(h->rects[i]->ass);
if(head_len < 0) return -1;
text = &h->rects[23]->ass[head_len];
*q++ = 0x03; // data unit id
*q++ = 0x2c; // data unit length
*q++ = rfl + (i % 9); // 2 reserved, 1 field_parity, 5 line_offset
*q++ = 0xe4; // frame coding
mag = text[0] - 0x30;
pageno[1] = text[1] - 0x30;
pageno[0] = text[2] - 0x30;
if((ncount % 3) == 1) mag = 4;
else mag = 6;
nr = (i + 1) % 25; // max 31, for simple, now take 23;
if(i == 23) {
nr = 0;
}
attr.bk_color = 0x04;
attr.ft_color = 0x07;
if((ncount % 3) == 0 && i == 23) {
text[0] = '4';
mag = 4;
}
if((ncount % 3) == 1 && i == 23) {
text[0] = '6';
mag = 6;
}
if((ncount % 3) == 1 && i == 23) {
text[0] = '5';
mag = 5;
}
q += encode_magazine_packet_number(q, mag, nr); // i-th, i+1-th byte, magazine 2,4,6,8
if(i == 23) {
q += encode_page_header(q, pageno, subcode, ctrlbits);
}
q += encode_data_block(q, &attr, (uint8_t *)&h->rects[i]->ass[head_len], i == 23 ? 32 : 40);
invert_data(q - 42, 42);
}
ncount++;
len = 188 - 50;
size = q - &outbuf[1];
if(size < len) padding = len - size;
else if(size > len) {
len = size - len;
padding = 184 - len % 184;
if(padding == 184) padding = 0;
}
for(size = padding; size > 0; size -= 46) {
*q++ = 0xff;
*q++ = 0x2c;
memset(q, 0xff, 44);
q += 44;
}
return q - outbuf;
}
static int encode_dvb_teletext0(DVBSubtitleContext *s, uint8_t *outbuf, AVSubtitle *h)
{
int i = 0, head_len = 0;
static int m = 0;
uint8_t *q;
uint8_t rfl = 0x27;
int mag, nr;
int rows;
int padding = 0, len, size;
static uint8_t pageno[2], subcode[4], ctrlbits[4];
int j = 0, k = 0;
q = outbuf;
*q++ = 0x10; // data identifier
rows = FFMIN(h->num_rects, 24);
subcode[0] = 0;
subcode[0] %= 16;
subcode[1] = 0;
subcode[1] %= 8;
subcode[2] = 0;
subcode[2] %= 16;
subcode[3] = 0;
subcode[3] %= 4;
ctrlbits[0] = 0x00; // C4, Erase Page
ctrlbits[1] = 0x00; // C5, C6
ctrlbits[2] = 0x04; // C7, C8, C9, C10
ctrlbits[3] = 0x0d; // C11, C12, C13, C14, character subset, italian
for(i = 0; i < 24; i++) {
TexAttr attr;
*q++ = 0x03; // data unit id
*q++ = 0x2c; // data unit length
if(i < 9) {
*q++ = 0x27 + i; // 2 reserved, 1 field_parity, 5 line_offset
}
else if(i < 12) {
*q++ = 0x27 + i + 3; // 2 reserved, 1 field_parity, 5 line_offset
}
else if(i < 21) {
*q++ = 0x07 + j++; // 2 reserved, 1 field_parity, 5 line_offset
}
else {
*q++ = 0x13 + k++; // 2 reserved, 1 field_parity, 5 line_offset
}
*q++ = 0xe4; // frame coding
mag = 6;
nr = (i + 1) % 25; // max 31, for simple, now take 23;
attr.bk_color = 0x04;
attr.ft_color = 0x07;
if(i == 23) {
nr = 0;
mag = 1;
pageno[0] = 0;
pageno[1] = 0;
}
q += encode_magazine_packet_number(q, mag, nr); // i-th, i+1-th byte, magazine 2,4,6,8
if(i == 23) {
q += encode_page_header(q, pageno, subcode, ctrlbits);
}
q += encode_data_block2(q, &attr, text0[i], i == 23 ? 32 : 40);
invert_data(q - 42, 42);
}
len = 188 - 50;
size = q - &outbuf[1];
if(size < len) padding = len - size;
else if(size > len) {
len = size - len;
padding = 184 - len % 184;
if(padding == 184) padding = 0;
}
for(size = padding; size > 0; size -= 46) {
*q++ = 0xff;
*q++ = 0x2c;
memset(q, 0xff, 44);
q += 44;
}
return q - outbuf;
}
static int encode_dvb_teletext1(DVBSubtitleContext *s, uint8_t *outbuf, AVSubtitle *h)
{
int i = 0, head_len = 0;
static int m = 0;
uint8_t *q;
uint8_t rfl = 0x27;
int mag, nr;
int rows;
int padding = 0, len, size;
static uint8_t pageno[2], subcode[4], ctrlbits[4];
int j = 0, k = 0;
q = outbuf;
*q++ = 0x10; // data identifier
rows = FFMIN(h->num_rects, 24);
subcode[0] = 0;
subcode[0] %= 16;
subcode[1] = 0;
subcode[1] %= 8;
subcode[2] = 0;
subcode[2] %= 16;
subcode[3] = 0;
subcode[3] %= 4;
ctrlbits[0] = 0x00; // C4, Erase Page
ctrlbits[1] = 0x00; // C5, C6
ctrlbits[2] = 0x04; // C7, C8, C9, C10
ctrlbits[3] = 0x0d; // C11, C12, C13, C14, character subset, italian
for(i = 0; i < 24; i++) {
TexAttr attr;
*q++ = 0x03; // data unit id
*q++ = 0x2c; // data unit length
// *q++ = rfl + (i % 9); // 2 reserved, 1 field_parity, 5 line_offset
if(i < 9) {
*q++ = 0x27 + i; // 2 reserved, 1 field_parity, 5 line_offset
}
else if(i < 12) {
*q++ = 0x27 + i + 3; // 2 reserved, 1 field_parity, 5 line_offset
}
else if(i < 21) {
*q++ = 0x07 + j++; // 2 reserved, 1 field_parity, 5 line_offset
}
else {
*q++ = 0x13 + k++; // 2 reserved, 1 field_parity, 5 line_offset
}
*q++ = 0xe4; // frame coding
mag = 1;
nr = (i + 1) % 25; // max 31, for simple, now take 23;
if(i == 23) {
nr = 0;
mag = 6;
pageno[0] = 1;
pageno[1] = 3;
}
attr.bk_color = 0x04;
attr.ft_color = 0x07;
q += encode_magazine_packet_number(q, mag, nr); // i-th, i+1-th byte, magazine 2,4,6,8
if(i == 23) {
q += encode_page_header(q, pageno, subcode, ctrlbits);
}
q += encode_data_block2(q, &attr, text1[i], i == 23 ? 32 : 40);
invert_data(q - 42, 42);
}
len = 188 - 50;
size = q - &outbuf[1];
if(size < len) padding = len - size;
else if(size > len) {
len = size - len;
padding = 184 - len % 184;
if(padding == 184) padding = 0;
}
for(size = padding; size > 0; size -= 46) {
*q++ = 0xff;
*q++ = 0x2c;
memset(q, 0xff, 44);
q += 44;
}
return q - outbuf;
}
static int encode_dvb_teletext2(DVBSubtitleContext *s, uint8_t *outbuf, AVSubtitle *h)
{
int i = 0, head_len = 0;
static int m = 0;
uint8_t *q;
uint8_t rfl = 0x27;
int mag, nr;
int rows;
int padding = 0, len, size;
static uint8_t pageno[2], subcode[4], ctrlbits[4];
int j = 0, k = 0;
q = outbuf;
*q++ = 0x10; // data identifier
rows = FFMIN(h->num_rects, 24);
subcode[0] = 0;
subcode[0] %= 16;
subcode[1] = 0;
subcode[1] %= 8;
subcode[2] = 0;
subcode[2] %= 16;
subcode[3] = 0;
subcode[3] %= 4;
ctrlbits[0] = 0x00; // C4, Erase Page
ctrlbits[1] = 0x00; // C5, C6
ctrlbits[2] = 0x04; // C7, C8, C9, C10
ctrlbits[3] = 0x0d; // C11, C12, C13, C14, character subset, italian
for(i = 0; i < 24; i++) {
TexAttr attr;
*q++ = 0x03; // data unit id
*q++ = 0x2c; // data unit length
// *q++ = rfl + (i % 9); // 2 reserved, 1 field_parity, 5 line_offset
if(i < 9) {
*q++ = 0x27 + i; // 2 reserved, 1 field_parity, 5 line_offset
}
else if(i < 12) {
*q++ = 0x27 + i + 3; // 2 reserved, 1 field_parity, 5 line_offset
}
else if(i < 21) {
*q++ = 0x07 + j++; // 2 reserved, 1 field_parity, 5 line_offset
}
else {
*q++ = 0x13 + k++; // 2 reserved, 1 field_parity, 5 line_offset
}
*q++ = 0xe4; // frame coding
mag = 6;
nr = (i + 1) % 25; // max 31, for simple, now take 23;
if(i == 23) {
nr = 0;
mag = 0;
pageno[0] = 1;
pageno[1] = 8;
subcode[0] = 1;
subcode[1] = 1;
ctrlbits[3] = 0;
}
attr.bk_color = 0x04;
attr.ft_color = 0x07;
q += encode_magazine_packet_number(q, mag, nr); // i-th, i+1-th byte, magazine 2,4,6,8
if(i == 23) {
q += encode_page_header(q, pageno, subcode, ctrlbits);
}
q += encode_data_block2(q, &attr, text2[i], i == 23 ? 32 : 40);
invert_data(q - 42, 42);
}
len = 188 - 50;
size = q - &outbuf[1];
if(size < len) padding = len - size;
else if(size > len) {
len = size - len;
padding = 184 - len % 184;
if(padding == 184) padding = 0;
}
for(size = padding; size > 0; size -= 46) {
*q++ = 0xff;
*q++ = 0x2c;
memset(q, 0xff, 44);
q += 44;
}
return q - outbuf;
}
static int dvbtex_encode(AVCodecContext *avctx,
unsigned char *buf, int buf_size, void *data)
{
DVBSubtitleContext *s = avctx->priv_data;
AVSubtitle *sub = data;
int encoderet = 0;
static uint32_t ncount = 0;
if((ncount % 3) == 0) {
encoderet = encode_dvb_teletext0(s, buf, sub);
}
else if((ncount % 3) == 1) {
encoderet = encode_dvb_teletext1(s, buf, sub);
}
else {
encoderet = encode_dvb_teletext2(s, buf, sub);
}
/*
encoderet = encode_dvb_teletext(s, buf, sub);
*/
ncount++;
return encoderet;
}
static av_cold int dvbtex_encoder_init(AVCodecContext *avctx)
{
return 0;
}
#define OFFSET(x) offsetof(DVBSubtitleContext, x)
static const AVOption options[] = {
{ NULL },
};
static const AVClass libdvbtex_class = {
.class_name = "dvbtex encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_dvbtex_encoder = {
.name = "dvbteletext",
.type = AVMEDIA_TYPE_SUBTITLE,
.id = CODEC_ID_DVB_TELETEXT,
.priv_data_size = sizeof(DVBSubtitleContext),
.init = dvbtex_encoder_init,
.encode = dvbtex_encode,
.long_name = NULL_IF_CONFIG_SMALL("DVB teletext"),
.priv_class = &libdvbtex_class,
};