1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2007 Laurent Aimar
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
27 /* CC have a maximum rate of 9600 bit/s (per field?) */
28 #define CC_MAX_DATA_SIZE (2 * 3*600)
31 /* Which channel are present */
32 vlc_bool_t pb_present[4];
38 * byte[x+0]: field (0/1)
39 * byte[x+1]: cc data 1
40 * byte[x+2]: cc data 2
43 uint8_t p_data[CC_MAX_DATA_SIZE];
46 static inline int cc_Channel( int i_field, const uint8_t p_data[2] )
48 const uint8_t d = p_data[0] & 0x7f;
49 if( i_field != 0 && i_field != 1 )
55 /* unknown(middle of a command) or not cc channel */
58 static inline void cc_Init( cc_data_t *c )
62 for( i = 0; i < 4; i++ )
63 c-> pb_present[i] = VLC_FALSE;
65 c->b_reorder = VLC_FALSE;
67 static inline void cc_Exit( cc_data_t *c )
72 static inline void cc_Flush( cc_data_t *c )
76 static inline void cc_Extract( cc_data_t *c, const uint8_t *p_src, int i_src )
78 static const uint8_t p_cc_ga94[4] = { 0x47, 0x41, 0x39, 0x34 };
79 static const uint8_t p_cc_dvd[4] = { 0x43, 0x43, 0x01, 0xf8 };
80 static const uint8_t p_cc_replaytv4a[2] = { 0xbb, 0x02 };
81 static const uint8_t p_cc_replaytv4b[2] = { 0xcc, 0x02 };
82 static const uint8_t p_cc_replaytv5a[2] = { 0x99, 0x02 };
83 static const uint8_t p_cc_replaytv5b[2] = { 0xaa, 0x02 };
84 //static const uint8_t p_afd_start[4] = { 0x44, 0x54, 0x47, 0x31 };
89 if( !memcmp( p_cc_ga94, p_src, 4 ) && i_src >= 5+1+1+1 && p_src[4] == 0x03 )
91 /* Extract CC from DVB/ATSC TS */
94 * u1 process_cc_data_flag
95 * u1 additional_data_flag
97 * u8 reserved(1111 1111)
99 * u5 marker bit(1111 1)
104 * u8 marker bit(1111 1111)
105 * if additional_data_flag
112 const uint8_t *cc = &p_src[5];
113 const int i_count_cc = cc[0]&0x1f;
116 if( !(cc[0]&0x40) ) // process flag
118 if( i_src < 5 + 1+1 + i_count_cc*3 + 1) // broken packet
120 if( i_count_cc <= 0 ) // no cc present
122 if( cc[2+i_count_cc * 3] != 0xff ) // marker absent
126 for( i = 0; i < i_count_cc; i++, cc += 3 )
128 int i_field = cc[0] & 0x03;
130 if( ( cc[0] & 0xfc ) != 0xfc )
132 if( i_field != 0 && i_field != 1 )
134 if( c->i_data + 3 > CC_MAX_DATA_SIZE )
137 i_channel = cc_Channel( i_field, &cc[1] );
138 if( i_channel >= 0 && i_channel < 4 )
139 c->pb_present[i_channel] = VLC_TRUE;
141 c->p_data[c->i_data++] = i_field;
142 c->p_data[c->i_data++] = cc[1];
143 c->p_data[c->i_data++] = cc[2];
145 c->b_reorder = VLC_TRUE;
147 else if( !memcmp( p_cc_dvd, p_src, 4 ) && i_src > 4+1 )
150 const int b_truncate = p_src[4] & 0x01;
151 const int i_field_first = (p_src[4] & 0x80) ? 0 : 1;
152 const int i_count_cc2 = (p_src[4] >> 1) & 0xf;
153 const uint8_t *cc = &p_src[5];
156 if( i_src < 4+1+6*i_count_cc2 - ( b_truncate ? 3 : 0) )
158 for( i = 0; i < i_count_cc2; i++ )
161 for( j = 0; j < 2; j++, cc += 3 )
163 const int i_field = j == i_field_first ? 0 : 1;
166 if( b_truncate && i == i_count_cc2 - 1 && j == 1 )
168 if( cc[0] != 0xff && cc[0] != 0xfe )
170 if( c->i_data + 3 > CC_MAX_DATA_SIZE )
173 i_channel = cc_Channel( i_field, &cc[1] );
174 if( i_channel >= 0 && i_channel < 4 )
175 c->pb_present[i_channel] = VLC_TRUE;
176 c->p_data[c->i_data++] = i_field;
177 c->p_data[c->i_data++] = cc[1];
178 c->p_data[c->i_data++] = cc[2];
181 c->b_reorder = VLC_FALSE;
183 else if( i_src >= 2+2 + 2+2 &&
184 ( ( !memcmp( p_cc_replaytv4a, &p_src[0], 2 ) && !memcmp( p_cc_replaytv4b, &p_src[4], 2 ) ) ||
185 ( !memcmp( p_cc_replaytv5a, &p_src[0], 2 ) && !memcmp( p_cc_replaytv5b, &p_src[4], 2 ) ) ) )
188 const uint8_t *cc = &p_src[0];
190 if( c->i_data + 2*3 > CC_MAX_DATA_SIZE )
193 for( i = 0; i < 2; i++, cc += 4 )
195 const int i_field = i == 0 ? 1 : 0;
196 int i_channel = cc_Channel( i_field, &cc[2] );
197 if( i_channel >= 0 && i_channel < 4 )
198 c->pb_present[i_channel] = VLC_TRUE;
199 c->p_data[c->i_data++] = i_field;
200 c->p_data[c->i_data++] = cc[2];
201 c->p_data[c->i_data++] = cc[3];
203 c->b_reorder = VLC_FALSE;
208 #define V(x) ( ( x < 0x20 || x >= 0x7f ) ? '?' : x )
209 fprintf( stderr, "-------------- unknown user data %2.2x %2.2x %2.2x %2.2x %c%c%c%c\n",
210 p_src[0], p_src[1], p_src[2], p_src[3],
211 V(p_src[0]), V(p_src[1]), V(p_src[2]), V(p_src[3]) );
214 /* TODO DVD CC, ... */