1 /*****************************************************************************
2 * ps.h: Program Stream demuxer helper
3 *****************************************************************************
4 * Copyright (C) 2004 VideoLAN
5 * $Id: ps.h,v 1.2 2004/01/17 23:51:50 fenrir Exp $
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 );
107 /* return the id of a PES (should be valid) */
108 static inline int ps_pkt_id( block_t *p_pkt )
110 if( p_pkt->p_buffer[3] == 0xbd &&
111 p_pkt->i_buffer >= 9 &&
112 p_pkt->i_buffer >= 9 + p_pkt->p_buffer[8] )
114 return 0xbd00 | p_pkt->p_buffer[9+p_pkt->p_buffer[8]];
116 return p_pkt->p_buffer[3];
119 /* return the size of the next packet
120 * XXX you need to give him at least 14 bytes (and it need to start as a
122 static inline int ps_pkt_size( uint8_t *p, int i_peek )
124 if( p[3] == 0xb9 && i_peek >= 4 )
128 else if( p[3] == 0xba )
130 if( (p[4] >> 6) == 0x01 && i_peek >= 14 )
132 return 14 + (p[13]&0x07);
134 else if( (p[4] >> 4) == 0x02 && i_peek >= 12 )
140 else if( i_peek >= 6 )
142 return 6 + ((p[4]<<8) | p[5] );
147 /* parse a PACK PES */
148 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr, int *pi_mux_rate )
150 uint8_t *p = p_pkt->p_buffer;
151 if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
153 *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
154 (((int64_t)p[4]&0x03) << 28 )|
155 ((int64_t)p[5] << 20 )|
156 (((int64_t)p[6]&0xf8) << 12 )|
157 (((int64_t)p[6]&0x03) << 13 )|
158 ((int64_t)p[7] << 5 )|
159 ((int64_t)p[8] >> 3 )) * 100 / 9;
161 *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
163 else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
165 *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
166 ((int64_t)p[5] << 22 )|
167 (((int64_t)p[6]&0xfe) << 14 )|
168 ((int64_t)p[7] << 7 )|
169 ((int64_t)p[8] >> 1 )) * 100 / 9;
171 *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
180 /* Parse a SYSTEM PES */
181 static inline int ps_pkt_parse_system( block_t *p_pkt, ps_track_t tk[PS_TK_COUNT] )
183 uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
185 while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
187 /* msg_Dbg( p_demux, " SYSTEM_START_CODE: id=0x%x", p[0] ); */
191 int i_tk = PS_ID_TO_TK( i_id );
193 if( !tk[i_tk].b_seen )
195 if( !ps_track_fill( &tk[i_tk], i_id ) )
197 tk[i_tk].b_seen = VLC_TRUE;
207 /* Parse a PES (and skip i_skip_extra in the payload) */
208 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
213 memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 30 ) );
217 case 0xBC: /* Program stream map */
218 case 0xBE: /* Padding */
219 case 0xBF: /* Private stream 2 */
222 case 0xFF: /* Program stream directory */
223 case 0xF2: /* DSMCC stream */
224 case 0xF8: /* ITU-T H.222.1 type E stream */
229 if( ( header[6]&0xC0 ) == 0x80 )
232 i_skip = header[8] + 9;
234 if( header[7]&0x80 ) /* has pts */
236 p_pes->i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
237 (mtime_t)(header[10] << 22)|
238 ((mtime_t)(header[11]&0xfe) << 14)|
239 (mtime_t)(header[12] << 7)|
240 (mtime_t)(header[12] >> 1);
242 if( header[7]&0x40 ) /* has dts */
244 p_pes->i_dts = ((mtime_t)(header[13]&0x0e ) << 29)|
245 (mtime_t)(header[14] << 22)|
246 ((mtime_t)(header[15]&0xfe) << 14)|
247 (mtime_t)(header[16] << 7)|
248 (mtime_t)(header[17] >> 1);
255 while( i_skip < 23 && header[i_skip] == 0xff )
261 /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
264 if( ( header[i_skip] & 0xC0 ) == 0x40 )
269 if( header[i_skip]&0x20 )
271 p_pes->i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
272 (mtime_t)(header[i_skip+1] << 22)|
273 ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
274 (mtime_t)(header[i_skip+3] << 7)|
275 (mtime_t)(header[i_skip+4] >> 1);
277 if( header[i_skip]&0x10 ) /* has dts */
279 p_pes->i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
280 (mtime_t)(header[i_skip+6] << 22)|
281 ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
282 (mtime_t)(header[i_skip+8] << 7)|
283 (mtime_t)(header[i_skip+9] >> 1);
298 i_skip += i_skip_extra;
300 if( p_pes->i_buffer <= i_skip )
305 p_pes->p_buffer += i_skip;
306 p_pes->i_buffer -= i_skip;
308 p_pes->i_dts = 100 * p_pes->i_dts / 9;
309 p_pes->i_pts = 100 * p_pes->i_pts / 9;