1 /*****************************************************************************
2 * ps.h: Program Stream demuxer helper
3 *****************************************************************************
4 * Copyright (C) 2004 VideoLAN
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 #define PS_TK_COUNT (512 - 0xc0)
25 #define PS_ID_TO_TK( id ) ((id) <= 0xff ? (id) - 0xc0 : ((id)&0xff) + (256 - 0xc0))
35 /* Init a set of track */
36 static inline void ps_track_init( ps_track_t tk[PS_TK_COUNT] )
39 for( i = 0; i < PS_TK_COUNT; i++ )
41 tk[i].b_seen = VLC_FALSE;
44 es_format_Init( &tk[i].fmt, UNKNOWN_ES, 0 );
48 /* From id fill i_skip and es_format_t */
49 static inline int ps_track_fill( ps_track_t *tk, int i_id )
52 if( ( i_id&0xff00 ) == 0xbd00 )
54 if( ( i_id&0xf8 ) == 0x88 )
56 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('d','t','s',' ') );
59 else if( ( i_id&0xf0 ) == 0x80 )
61 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('a','5','2',' ') );
64 else if( ( i_id&0xe0 ) == 0x20 )
66 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('s','p','u',' ') );
69 else if( ( i_id&0xf0 ) == 0xa0 )
71 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('l','p','c','m') );
74 else if( ( i_id&0xff ) == 0x70 )
76 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('o','g','t',' ') );
78 else if( ( i_id&0xfc ) == 0x00 )
80 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('c','v','d',' ') );
84 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
90 if( ( i_id&0xf0 ) == 0xe0 )
92 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
94 else if( ( i_id&0xe0 ) == 0xc0 )
96 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
100 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
105 /* PES packets usually contain truncated frames */
106 tk->fmt.b_packetized = VLC_FALSE;
111 /* return the id of a PES (should be valid) */
112 static inline int ps_pkt_id( block_t *p_pkt )
114 if( p_pkt->p_buffer[3] == 0xbd &&
115 p_pkt->i_buffer >= 9 &&
116 p_pkt->i_buffer >= 9 + p_pkt->p_buffer[8] )
118 return 0xbd00 | p_pkt->p_buffer[9+p_pkt->p_buffer[8]];
120 return p_pkt->p_buffer[3];
123 /* return the size of the next packet
124 * XXX you need to give him at least 14 bytes (and it need to start as a
126 static inline int ps_pkt_size( uint8_t *p, int i_peek )
128 if( p[3] == 0xb9 && i_peek >= 4 )
132 else if( p[3] == 0xba )
134 if( (p[4] >> 6) == 0x01 && i_peek >= 14 )
136 return 14 + (p[13]&0x07);
138 else if( (p[4] >> 4) == 0x02 && i_peek >= 12 )
144 else if( i_peek >= 6 )
146 return 6 + ((p[4]<<8) | p[5] );
151 /* parse a PACK PES */
152 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr,
155 uint8_t *p = p_pkt->p_buffer;
156 if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
158 *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
159 (((int64_t)p[4]&0x03) << 28 )|
160 ((int64_t)p[5] << 20 )|
161 (((int64_t)p[6]&0xf8) << 12 )|
162 (((int64_t)p[6]&0x03) << 13 )|
163 ((int64_t)p[7] << 5 )|
164 ((int64_t)p[8] >> 3 )) * 100 / 9;
166 *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
168 else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
170 *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
171 ((int64_t)p[5] << 22 )|
172 (((int64_t)p[6]&0xfe) << 14 )|
173 ((int64_t)p[7] << 7 )|
174 ((int64_t)p[8] >> 1 )) * 100 / 9;
176 *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
185 /* Parse a SYSTEM PES */
186 static inline int ps_pkt_parse_system( block_t *p_pkt,
187 ps_track_t tk[PS_TK_COUNT] )
189 uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
191 /* System header is not useable if it references private streams (0xBD)
192 * or 'all audio streams' (0xB8) or 'all video streams' (0xB9) */
193 while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
197 /* fprintf( stderr, " SYSTEM_START_CODEEE: id=0x%x\n", p[0] ); */
198 if( p[0] >= 0xBC || p[0] == 0xB8 || p[0] == 0xB9 ) p += 2;
203 int i_tk = PS_ID_TO_TK( i_id );
205 if( !tk[i_tk].b_seen )
207 if( !ps_track_fill( &tk[i_tk], i_id ) )
209 tk[i_tk].b_seen = VLC_TRUE;
217 /* Parse a PES (and skip i_skip_extra in the payload) */
218 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
223 memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 30 ) );
227 case 0xBC: /* Program stream map */
228 case 0xBE: /* Padding */
229 case 0xBF: /* Private stream 2 */
232 case 0xFF: /* Program stream directory */
233 case 0xF2: /* DSMCC stream */
234 case 0xF8: /* ITU-T H.222.1 type E stream */
239 if( ( header[6]&0xC0 ) == 0x80 )
242 i_skip = header[8] + 9;
244 if( header[7]&0x80 ) /* has pts */
246 p_pes->i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
247 (mtime_t)(header[10] << 22)|
248 ((mtime_t)(header[11]&0xfe) << 14)|
249 (mtime_t)(header[12] << 7)|
250 (mtime_t)(header[13] >> 1);
252 if( header[7]&0x40 ) /* has dts */
254 p_pes->i_dts = ((mtime_t)(header[14]&0x0e ) << 29)|
255 (mtime_t)(header[15] << 22)|
256 ((mtime_t)(header[16]&0xfe) << 14)|
257 (mtime_t)(header[17] << 7)|
258 (mtime_t)(header[18] >> 1);
265 while( i_skip < 23 && header[i_skip] == 0xff )
271 /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
274 if( ( header[i_skip] & 0xC0 ) == 0x40 )
279 if( header[i_skip]&0x20 )
281 p_pes->i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
282 (mtime_t)(header[i_skip+1] << 22)|
283 ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
284 (mtime_t)(header[i_skip+3] << 7)|
285 (mtime_t)(header[i_skip+4] >> 1);
287 if( header[i_skip]&0x10 ) /* has dts */
289 p_pes->i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
290 (mtime_t)(header[i_skip+6] << 22)|
291 ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
292 (mtime_t)(header[i_skip+8] << 7)|
293 (mtime_t)(header[i_skip+9] >> 1);
308 i_skip += i_skip_extra;
310 if( p_pes->i_buffer <= i_skip )
315 p_pes->p_buffer += i_skip;
316 p_pes->i_buffer -= i_skip;
318 p_pes->i_dts = 100 * p_pes->i_dts / 9;
319 p_pes->i_pts = 100 * p_pes->i_pts / 9;