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 );
41 /* Init a set of track */
42 static inline void ps_track_init( ps_track_t tk[PS_TK_COUNT] )
45 for( i = 0; i < PS_TK_COUNT; i++ )
47 tk[i].b_seen = VLC_FALSE;
51 es_format_Init( &tk[i].fmt, UNKNOWN_ES, 0 );
55 /* From id fill i_skip and es_format_t */
56 static inline int ps_track_fill( ps_track_t *tk, ps_psm_t *p_psm, int i_id )
60 if( ( i_id&0xff00 ) == 0xbd00 )
62 if( ( i_id&0xf8 ) == 0x88 )
64 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('d','t','s',' ') );
67 else if( ( i_id&0xf0 ) == 0x80 )
69 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('a','5','2',' ') );
72 else if( ( i_id&0xe0 ) == 0x20 )
74 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('s','p','u',' ') );
77 else if( ( i_id&0xf0 ) == 0xa0 )
79 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('l','p','c','m') );
82 else if( ( i_id&0xff ) == 0x70 )
84 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('o','g','t',' ') );
86 else if( ( i_id&0xfc ) == 0x00 )
88 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('c','v','d',' ') );
92 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
98 int i_type = ps_id_to_type( p_psm , i_id );
100 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
102 if( (i_id&0xf0) == 0xe0 && i_type == 0x10 )
104 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','4','v') );
106 else if( (i_id&0xf0) == 0xe0 && i_type == 0x02 )
108 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
110 else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x03 )
112 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
115 if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xf0 ) == 0xe0 )
117 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
119 else if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xe0 ) == 0xc0 )
121 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
123 else if( tk->fmt.i_cat == UNKNOWN_ES ) return VLC_EGENERIC;
126 /* PES packets usually contain truncated frames */
127 tk->fmt.b_packetized = VLC_FALSE;
132 /* return the id of a PES (should be valid) */
133 static inline int ps_pkt_id( block_t *p_pkt )
135 if( p_pkt->p_buffer[3] == 0xbd &&
136 p_pkt->i_buffer >= 9 &&
137 p_pkt->i_buffer >= 9 + p_pkt->p_buffer[8] )
139 return 0xbd00 | p_pkt->p_buffer[9+p_pkt->p_buffer[8]];
141 return p_pkt->p_buffer[3];
144 /* return the size of the next packet
145 * XXX you need to give him at least 14 bytes (and it need to start as a
147 static inline int ps_pkt_size( uint8_t *p, int i_peek )
149 if( p[3] == 0xb9 && i_peek >= 4 )
153 else if( p[3] == 0xba )
155 if( (p[4] >> 6) == 0x01 && i_peek >= 14 )
157 return 14 + (p[13]&0x07);
159 else if( (p[4] >> 4) == 0x02 && i_peek >= 12 )
165 else if( i_peek >= 6 )
167 return 6 + ((p[4]<<8) | p[5] );
172 /* parse a PACK PES */
173 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr,
176 uint8_t *p = p_pkt->p_buffer;
177 if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
179 *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
180 (((int64_t)p[4]&0x03) << 28 )|
181 ((int64_t)p[5] << 20 )|
182 (((int64_t)p[6]&0xf8) << 12 )|
183 (((int64_t)p[6]&0x03) << 13 )|
184 ((int64_t)p[7] << 5 )|
185 ((int64_t)p[8] >> 3 )) * 100 / 9;
187 *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
189 else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
191 *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
192 ((int64_t)p[5] << 22 )|
193 (((int64_t)p[6]&0xfe) << 14 )|
194 ((int64_t)p[7] << 7 )|
195 ((int64_t)p[8] >> 1 )) * 100 / 9;
197 *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
206 /* Parse a SYSTEM PES */
207 static inline int ps_pkt_parse_system( block_t *p_pkt, ps_psm_t *p_psm,
208 ps_track_t tk[PS_TK_COUNT] )
210 uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
212 /* System header is not useable if it references private streams (0xBD)
213 * or 'all audio streams' (0xB8) or 'all video streams' (0xB9) */
214 while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
218 /* fprintf( stderr, " SYSTEM_START_CODEEE: id=0x%x\n", p[0] ); */
219 if( p[0] >= 0xBC || p[0] == 0xB8 || p[0] == 0xB9 ) p += 2;
224 int i_tk = PS_ID_TO_TK( i_id );
226 if( !tk[i_tk].b_seen )
228 if( !ps_track_fill( &tk[i_tk], p_psm, i_id ) )
230 tk[i_tk].b_seen = VLC_TRUE;
238 /* Parse a PES (and skip i_skip_extra in the payload) */
239 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
244 memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 30 ) );
248 case 0xBC: /* Program stream map */
249 case 0xBE: /* Padding */
250 case 0xBF: /* Private stream 2 */
253 case 0xFF: /* Program stream directory */
254 case 0xF2: /* DSMCC stream */
255 case 0xF8: /* ITU-T H.222.1 type E stream */
260 if( ( header[6]&0xC0 ) == 0x80 )
263 i_skip = header[8] + 9;
265 if( header[7]&0x80 ) /* has pts */
267 p_pes->i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
268 (mtime_t)(header[10] << 22)|
269 ((mtime_t)(header[11]&0xfe) << 14)|
270 (mtime_t)(header[12] << 7)|
271 (mtime_t)(header[13] >> 1);
273 if( header[7]&0x40 ) /* has dts */
275 p_pes->i_dts = ((mtime_t)(header[14]&0x0e ) << 29)|
276 (mtime_t)(header[15] << 22)|
277 ((mtime_t)(header[16]&0xfe) << 14)|
278 (mtime_t)(header[17] << 7)|
279 (mtime_t)(header[18] >> 1);
286 while( i_skip < 23 && header[i_skip] == 0xff )
292 /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
295 if( ( header[i_skip] & 0xC0 ) == 0x40 )
300 if( header[i_skip]&0x20 )
302 p_pes->i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
303 (mtime_t)(header[i_skip+1] << 22)|
304 ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
305 (mtime_t)(header[i_skip+3] << 7)|
306 (mtime_t)(header[i_skip+4] >> 1);
308 if( header[i_skip]&0x10 ) /* has dts */
310 p_pes->i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
311 (mtime_t)(header[i_skip+6] << 22)|
312 ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
313 (mtime_t)(header[i_skip+8] << 7)|
314 (mtime_t)(header[i_skip+9] >> 1);
329 i_skip += i_skip_extra;
331 if( p_pes->i_buffer <= i_skip )
336 p_pes->p_buffer += i_skip;
337 p_pes->i_buffer -= i_skip;
339 p_pes->i_dts = 100 * p_pes->i_dts / 9;
340 p_pes->i_pts = 100 * p_pes->i_pts / 9;
345 /* Program stream map handling */
346 typedef struct p_es_t
352 uint8_t *p_descriptor;
364 static inline int ps_id_to_type( ps_psm_t *p_psm, int i_id )
367 for( i = 0; p_psm && i < p_psm->i_es; i++ )
369 if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->i_type;
374 static inline void ps_psm_init( ps_psm_t *p_psm )
376 p_psm->i_version = 0xFFFF;
381 static inline void ps_psm_destroy( ps_psm_t *p_psm )
383 while( p_psm->i_es-- )
385 if( p_psm->es[p_psm->i_es]->i_descriptor )
386 free( p_psm->es[p_psm->i_es]->p_descriptor );
387 free( p_psm->es[p_psm->i_es] );
389 if( p_psm->es ) free( p_psm->es );
395 static inline int ps_psm_fill( ps_psm_t *p_psm, block_t *p_pkt,
396 ps_track_t tk[PS_TK_COUNT], es_out_t *out )
398 int i_buffer = p_pkt->i_buffer;
399 uint8_t *p_buffer = p_pkt->p_buffer;
400 int i_length, i_version, i_info_length, i_esm_length, i_es_base, i;
402 if( !p_psm || p_buffer[3] != 0xbc ) return VLC_EGENERIC;
404 i_length = (uint16_t)(p_buffer[4] << 8) + p_buffer[5];
405 if( i_length > i_buffer ) return VLC_EGENERIC;
407 //i_current_next_indicator = (p_buffer[6] && 0x01);
408 i_version = (p_buffer[6] && 0xf8);
410 if( p_psm->i_version == i_version ) return VLC_EGENERIC;
412 ps_psm_destroy( p_psm );
414 i_info_length = (uint16_t)(p_buffer[8] << 8) + p_buffer[9];
415 if( i_info_length + 10 > i_length ) return VLC_EGENERIC;
417 /* Elementary stream map */
418 i_esm_length = (uint16_t)(p_buffer[ 10 + i_info_length ] << 8) +
419 p_buffer[ 11 + i_info_length];
420 i_es_base = 12 + i_info_length;
422 while( i_es_base + 4 < i_length )
426 es.i_type = p_buffer[ i_es_base ];
427 es.i_id = p_buffer[ i_es_base + 1 ];
428 i_info_length = (uint16_t)(p_buffer[ i_es_base + 2 ] << 8) +
429 p_buffer[ i_es_base + 3 ];
431 if( i_es_base + 4 + i_info_length > i_length ) break;
434 es.i_descriptor = i_info_length;
435 if( i_info_length > 0 )
437 es.p_descriptor = malloc( i_info_length );
438 memcpy( es.p_descriptor, p_buffer + i_es_base + 4, i_info_length);
441 p_psm->es = realloc( p_psm->es, sizeof(ps_es_t *) * (p_psm->i_es+1) );
442 p_psm->es[p_psm->i_es] = malloc( sizeof(ps_es_t) );
443 *p_psm->es[p_psm->i_es++] = es;
444 i_es_base += 4 + i_info_length;
449 p_psm->i_version = i_version;
451 /* Check/Modify our existing tracks */
452 for( i = 0; i < PS_TK_COUNT; i++ )
456 if( !tk[i].b_seen || !tk[i].es ) continue;
458 if( ps_track_fill( &tk_tmp, p_psm, tk[i].i_id ) != VLC_SUCCESS )
461 if( tk_tmp.fmt.i_codec == tk[i].fmt.i_codec ) continue;
463 es_out_Del( out, tk[i].es );
465 tk[i].b_seen = VLC_TRUE;
466 tk[i].es = es_out_Add( out, &tk[i].fmt );