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 : \
26 ((id)&0xff) + (256 - 0xc0))
28 typedef struct ps_psm_t ps_psm_t;
29 static inline int ps_id_to_type( ps_psm_t *, int );
40 /* Init a set of track */
41 static inline void ps_track_init( ps_track_t tk[PS_TK_COUNT] )
44 for( i = 0; i < PS_TK_COUNT; i++ )
46 tk[i].b_seen = VLC_FALSE;
49 es_format_Init( &tk[i].fmt, UNKNOWN_ES, 0 );
53 /* From id fill i_skip and es_format_t */
54 static inline int ps_track_fill( ps_track_t *tk, ps_psm_t *p_psm, int i_id )
57 if( ( i_id&0xff00 ) == 0xbd00 )
59 if( ( i_id&0xf8 ) == 0x88 )
61 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('d','t','s',' ') );
64 else if( ( i_id&0xf0 ) == 0x80 )
66 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('a','5','2',' ') );
69 else if( ( i_id&0xe0 ) == 0x20 )
71 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('s','p','u',' ') );
74 else if( ( i_id&0xf0 ) == 0xa0 )
76 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('l','p','c','m') );
79 else if( ( i_id&0xff ) == 0x70 )
81 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('o','g','t',' ') );
83 else if( ( i_id&0xfc ) == 0x00 )
85 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('c','v','d',' ') );
89 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
95 int i_type = ps_id_to_type( p_psm , i_id );
97 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
99 if( (i_id&0xf0) == 0xe0 && i_type == 0x10 )
101 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','4','v') );
103 else if( (i_id&0xf0) == 0xe0 && i_type == 0x02 )
105 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
107 else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x03 )
109 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
112 if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xf0 ) == 0xe0 )
114 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
116 else if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xe0 ) == 0xc0 )
118 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
120 else return VLC_EGENERIC;
123 /* PES packets usually contain truncated frames */
124 tk->fmt.b_packetized = VLC_FALSE;
129 /* return the id of a PES (should be valid) */
130 static inline int ps_pkt_id( block_t *p_pkt )
132 if( p_pkt->p_buffer[3] == 0xbd &&
133 p_pkt->i_buffer >= 9 &&
134 p_pkt->i_buffer >= 9 + p_pkt->p_buffer[8] )
136 return 0xbd00 | p_pkt->p_buffer[9+p_pkt->p_buffer[8]];
138 return p_pkt->p_buffer[3];
141 /* return the size of the next packet
142 * XXX you need to give him at least 14 bytes (and it need to start as a
144 static inline int ps_pkt_size( uint8_t *p, int i_peek )
146 if( p[3] == 0xb9 && i_peek >= 4 )
150 else if( p[3] == 0xba )
152 if( (p[4] >> 6) == 0x01 && i_peek >= 14 )
154 return 14 + (p[13]&0x07);
156 else if( (p[4] >> 4) == 0x02 && i_peek >= 12 )
162 else if( i_peek >= 6 )
164 return 6 + ((p[4]<<8) | p[5] );
169 /* parse a PACK PES */
170 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr,
173 uint8_t *p = p_pkt->p_buffer;
174 if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
176 *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
177 (((int64_t)p[4]&0x03) << 28 )|
178 ((int64_t)p[5] << 20 )|
179 (((int64_t)p[6]&0xf8) << 12 )|
180 (((int64_t)p[6]&0x03) << 13 )|
181 ((int64_t)p[7] << 5 )|
182 ((int64_t)p[8] >> 3 )) * 100 / 9;
184 *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
186 else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
188 *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
189 ((int64_t)p[5] << 22 )|
190 (((int64_t)p[6]&0xfe) << 14 )|
191 ((int64_t)p[7] << 7 )|
192 ((int64_t)p[8] >> 1 )) * 100 / 9;
194 *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
203 /* Parse a SYSTEM PES */
204 static inline int ps_pkt_parse_system( block_t *p_pkt, ps_psm_t *p_psm,
205 ps_track_t tk[PS_TK_COUNT] )
207 uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
209 /* System header is not useable if it references private streams (0xBD)
210 * or 'all audio streams' (0xB8) or 'all video streams' (0xB9) */
211 while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
215 /* fprintf( stderr, " SYSTEM_START_CODEEE: id=0x%x\n", p[0] ); */
216 if( p[0] >= 0xBC || p[0] == 0xB8 || p[0] == 0xB9 ) p += 2;
221 int i_tk = PS_ID_TO_TK( i_id );
223 if( !tk[i_tk].b_seen )
225 if( !ps_track_fill( &tk[i_tk], p_psm, i_id ) )
227 tk[i_tk].b_seen = VLC_TRUE;
235 /* Parse a PES (and skip i_skip_extra in the payload) */
236 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
241 memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 30 ) );
245 case 0xBC: /* Program stream map */
246 case 0xBE: /* Padding */
247 case 0xBF: /* Private stream 2 */
250 case 0xFF: /* Program stream directory */
251 case 0xF2: /* DSMCC stream */
252 case 0xF8: /* ITU-T H.222.1 type E stream */
257 if( ( header[6]&0xC0 ) == 0x80 )
260 i_skip = header[8] + 9;
262 if( header[7]&0x80 ) /* has pts */
264 p_pes->i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
265 (mtime_t)(header[10] << 22)|
266 ((mtime_t)(header[11]&0xfe) << 14)|
267 (mtime_t)(header[12] << 7)|
268 (mtime_t)(header[13] >> 1);
270 if( header[7]&0x40 ) /* has dts */
272 p_pes->i_dts = ((mtime_t)(header[14]&0x0e ) << 29)|
273 (mtime_t)(header[15] << 22)|
274 ((mtime_t)(header[16]&0xfe) << 14)|
275 (mtime_t)(header[17] << 7)|
276 (mtime_t)(header[18] >> 1);
283 while( i_skip < 23 && header[i_skip] == 0xff )
289 /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
292 if( ( header[i_skip] & 0xC0 ) == 0x40 )
297 if( header[i_skip]&0x20 )
299 p_pes->i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
300 (mtime_t)(header[i_skip+1] << 22)|
301 ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
302 (mtime_t)(header[i_skip+3] << 7)|
303 (mtime_t)(header[i_skip+4] >> 1);
305 if( header[i_skip]&0x10 ) /* has dts */
307 p_pes->i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
308 (mtime_t)(header[i_skip+6] << 22)|
309 ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
310 (mtime_t)(header[i_skip+8] << 7)|
311 (mtime_t)(header[i_skip+9] >> 1);
326 i_skip += i_skip_extra;
328 if( p_pes->i_buffer <= i_skip )
333 p_pes->p_buffer += i_skip;
334 p_pes->i_buffer -= i_skip;
336 p_pes->i_dts = 100 * p_pes->i_dts / 9;
337 p_pes->i_pts = 100 * p_pes->i_pts / 9;
342 /* Program stream map handling */
343 typedef struct p_es_t
349 uint8_t *p_descriptor;
351 struct ps_es_t *p_next;
363 static inline int ps_id_to_type( ps_psm_t *p_psm, int i_id )
366 for( i = 0; p_psm && i < p_psm->i_es; i++ )
368 if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->i_type;
373 static inline void ps_psm_init( ps_psm_t *p_psm )
375 p_psm->i_version = 0xFFFF;
380 static inline void ps_psm_destroy( ps_psm_t *p_psm )
382 while( p_psm->i_es-- )
384 if( p_psm->es[p_psm->i_es]->i_descriptor )
385 free( p_psm->es[p_psm->i_es]->p_descriptor );
386 free( p_psm->es[p_psm->i_es] );
388 if( p_psm->es ) free( p_psm->es );
394 static inline int ps_psm_fill( ps_psm_t *p_psm, block_t *p_pkt )
396 int i_buffer = p_pkt->i_buffer;
397 uint8_t *p_buffer = p_pkt->p_buffer;
398 int i_length, i_version, i_info_length, i_esm_length, i_es_base;
400 if( !p_psm || p_buffer[3] != 0xbc ) return VLC_EGENERIC;
402 i_length = (uint16_t)(p_buffer[4] << 8) + p_buffer[5];
403 if( i_length > i_buffer ) return VLC_EGENERIC;
405 //i_current_next_indicator = (p_buffer[6] && 0x01);
406 i_version = (p_buffer[6] && 0xf8);
408 if( p_psm->i_version == i_version ) return VLC_EGENERIC;
410 ps_psm_destroy( p_psm );
412 i_info_length = (uint16_t)(p_buffer[8] << 8) + p_buffer[9];
413 if( i_info_length + 10 > i_length ) return VLC_EGENERIC;
415 /* Elementary stream map */
416 i_esm_length = (uint16_t)(p_buffer[ 10 + i_info_length ] << 8) +
417 p_buffer[ 11 + i_info_length];
418 i_es_base = 12 + i_info_length;
420 while( i_es_base + 4 < i_length )
424 es.i_type = p_buffer[ i_es_base ];
425 es.i_id = p_buffer[ i_es_base + 1 ];
426 i_info_length = (uint16_t)(p_buffer[ i_es_base + 2 ] << 8) +
427 p_buffer[ i_es_base + 3 ];
429 if( i_es_base + 4 + i_info_length > i_length ) break;
432 es.i_descriptor = i_info_length;
433 if( i_info_length > 0 )
435 es.p_descriptor = malloc( i_info_length );
436 memcpy( es.p_descriptor, p_buffer + i_es_base + 4, i_info_length);
439 p_psm->es = realloc( &p_psm->es, sizeof(ps_es_t) * (p_psm->i_es+1) );
440 *p_psm->es[p_psm->i_es++] = es;
441 i_es_base += 4 + i_info_length;
446 p_psm->i_version = i_version;