1 /*****************************************************************************
2 * ps.h: Program Stream demuxer helper
3 *****************************************************************************
4 * Copyright (C) 2004 the VideoLAN team
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 *****************************************************************************/
24 #include <vlc_demux.h>
26 #define PS_TK_COUNT (512 - 0xc0)
27 #define PS_ID_TO_TK( id ) ((id) <= 0xff ? (id) - 0xc0 : \
28 ((id)&0xff) + (256 - 0xc0))
30 typedef struct ps_psm_t ps_psm_t;
31 static inline int ps_id_to_type( const ps_psm_t *, int );
32 static inline const uint8_t *ps_id_to_lang( const ps_psm_t *, int );
46 /* Init a set of track */
47 static inline void ps_track_init( ps_track_t tk[PS_TK_COUNT] )
50 for( i = 0; i < PS_TK_COUNT; i++ )
52 tk[i].b_seen = VLC_FALSE;
56 tk[i].i_first_pts = -1;
57 tk[i].i_last_pts = -1;
58 es_format_Init( &tk[i].fmt, UNKNOWN_ES, 0 );
62 /* From id fill i_skip and es_format_t */
63 static inline int ps_track_fill( ps_track_t *tk, ps_psm_t *p_psm, int i_id )
67 if( ( i_id&0xff00 ) == 0xbd00 )
69 if( ( i_id&0xf8 ) == 0x88 || (i_id&0xf8) == 0x98 )
71 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('d','t','s',' ') );
74 else if( ( i_id&0xf0 ) == 0x80
75 || (i_id&0xf0) == 0xc0 ) /* AC-3, Can also be used for DD+/E-AC-3 */
77 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('a','5','2',' ') );
80 else if( (i_id&0xf0) == 0xb0 )
82 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','l','p',' ') );
83 /* FIXME / untested ... no known decoder (at least not in VLC/ffmpeg) */
85 else if( ( i_id&0xe0 ) == 0x20 )
87 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('s','p','u',' ') );
90 else if( ( i_id&0xf0 ) == 0xa0 )
92 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('l','p','c','m') );
95 else if( ( i_id&0xff ) == 0x70 )
97 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('o','g','t',' ') );
99 else if( ( i_id&0xfc ) == 0x00 )
101 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('c','v','d',' ') );
105 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
111 int i_type = ps_id_to_type( p_psm , i_id );
113 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
115 if( (i_id&0xf0) == 0xe0 && i_type == 0x1b )
117 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('h','2','6','4') );
119 else if( (i_id&0xf0) == 0xe0 && i_type == 0x10 )
121 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','4','v') );
123 else if( (i_id&0xf0) == 0xe0 && i_type == 0x02 )
125 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
127 else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x0f )
129 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','4','a') );
131 else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x03 )
133 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
136 if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xf0 ) == 0xe0 )
138 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
140 else if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xe0 ) == 0xc0 )
142 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
144 else if( tk->fmt.i_cat == UNKNOWN_ES ) return VLC_EGENERIC;
147 /* PES packets usually contain truncated frames */
148 tk->fmt.b_packetized = VLC_FALSE;
150 if( ps_id_to_lang( p_psm , i_id ) )
152 tk->fmt.psz_language = malloc( 4 );
153 memcpy( tk->fmt.psz_language, ps_id_to_lang( p_psm , i_id ), 3 );
154 tk->fmt.psz_language[3] = 0;
160 /* return the id of a PES (should be valid) */
161 static inline int ps_pkt_id( block_t *p_pkt )
163 if( p_pkt->p_buffer[3] == 0xbd &&
164 p_pkt->i_buffer >= 9 &&
165 p_pkt->i_buffer >= 9 + p_pkt->p_buffer[8] )
167 return 0xbd00 | p_pkt->p_buffer[9+p_pkt->p_buffer[8]];
169 return p_pkt->p_buffer[3];
172 /* return the size of the next packet
173 * XXX you need to give him at least 14 bytes (and it need to start as a
175 static inline int ps_pkt_size( uint8_t *p, int i_peek )
177 if( p[3] == 0xb9 && i_peek >= 4 )
181 else if( p[3] == 0xba )
183 if( (p[4] >> 6) == 0x01 && i_peek >= 14 )
185 return 14 + (p[13]&0x07);
187 else if( (p[4] >> 4) == 0x02 && i_peek >= 12 )
193 else if( i_peek >= 6 )
195 return 6 + ((p[4]<<8) | p[5] );
200 /* parse a PACK PES */
201 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr,
204 uint8_t *p = p_pkt->p_buffer;
205 if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
207 *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
208 (((int64_t)p[4]&0x03) << 28 )|
209 ((int64_t)p[5] << 20 )|
210 (((int64_t)p[6]&0xf8) << 12 )|
211 (((int64_t)p[6]&0x03) << 13 )|
212 ((int64_t)p[7] << 5 )|
213 ((int64_t)p[8] >> 3 )) * 100 / 9;
215 *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
217 else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
219 *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
220 ((int64_t)p[5] << 22 )|
221 (((int64_t)p[6]&0xfe) << 14 )|
222 ((int64_t)p[7] << 7 )|
223 ((int64_t)p[8] >> 1 )) * 100 / 9;
225 *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
234 /* Parse a SYSTEM PES */
235 static inline int ps_pkt_parse_system( block_t *p_pkt, ps_psm_t *p_psm,
236 ps_track_t tk[PS_TK_COUNT] )
238 uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
240 /* System header is not useable if it references private streams (0xBD)
241 * or 'all audio streams' (0xB8) or 'all video streams' (0xB9) */
242 while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
246 /* fprintf( stderr, " SYSTEM_START_CODEEE: id=0x%x\n", p[0] ); */
247 if( p[0] >= 0xBC || p[0] == 0xB8 || p[0] == 0xB9 ) p += 2;
252 int i_tk = PS_ID_TO_TK( i_id );
254 if( !tk[i_tk].b_seen )
256 if( !ps_track_fill( &tk[i_tk], p_psm, i_id ) )
258 tk[i_tk].b_seen = VLC_TRUE;
266 /* Parse a PES (and skip i_skip_extra in the payload) */
267 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
272 memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 30 ) );
276 case 0xBC: /* Program stream map */
277 case 0xBE: /* Padding */
278 case 0xBF: /* Private stream 2 */
281 case 0xFF: /* Program stream directory */
282 case 0xF2: /* DSMCC stream */
283 case 0xF8: /* ITU-T H.222.1 type E stream */
288 if( ( header[6]&0xC0 ) == 0x80 )
291 i_skip = header[8] + 9;
293 if( header[7]&0x80 ) /* has pts */
295 p_pes->i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
296 (mtime_t)(header[10] << 22)|
297 ((mtime_t)(header[11]&0xfe) << 14)|
298 (mtime_t)(header[12] << 7)|
299 (mtime_t)(header[13] >> 1);
301 if( header[7]&0x40 ) /* has dts */
303 p_pes->i_dts = ((mtime_t)(header[14]&0x0e ) << 29)|
304 (mtime_t)(header[15] << 22)|
305 ((mtime_t)(header[16]&0xfe) << 14)|
306 (mtime_t)(header[17] << 7)|
307 (mtime_t)(header[18] >> 1);
314 while( i_skip < 23 && header[i_skip] == 0xff )
320 /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
323 if( ( header[i_skip] & 0xC0 ) == 0x40 )
328 if( header[i_skip]&0x20 )
330 p_pes->i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
331 (mtime_t)(header[i_skip+1] << 22)|
332 ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
333 (mtime_t)(header[i_skip+3] << 7)|
334 (mtime_t)(header[i_skip+4] >> 1);
336 if( header[i_skip]&0x10 ) /* has dts */
338 p_pes->i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
339 (mtime_t)(header[i_skip+6] << 22)|
340 ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
341 (mtime_t)(header[i_skip+8] << 7)|
342 (mtime_t)(header[i_skip+9] >> 1);
357 i_skip += i_skip_extra;
359 if( p_pes->i_buffer <= i_skip )
364 p_pes->p_buffer += i_skip;
365 p_pes->i_buffer -= i_skip;
367 p_pes->i_dts = 100 * p_pes->i_dts / 9;
368 p_pes->i_pts = 100 * p_pes->i_pts / 9;
373 /* Program stream map handling */
374 typedef struct ps_es_t
380 uint8_t *p_descriptor;
382 /* Language is iso639-2T */
395 static inline int ps_id_to_type( const ps_psm_t *p_psm, int i_id )
398 for( i = 0; p_psm && i < p_psm->i_es; i++ )
400 if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->i_type;
405 static inline const uint8_t *ps_id_to_lang( const ps_psm_t *p_psm, int i_id )
408 for( i = 0; p_psm && i < p_psm->i_es; i++ )
410 if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->lang;
415 static inline void ps_psm_init( ps_psm_t *p_psm )
417 p_psm->i_version = 0xFFFF;
422 static inline void ps_psm_destroy( ps_psm_t *p_psm )
424 while( p_psm->i_es-- )
426 if( p_psm->es[p_psm->i_es]->i_descriptor )
427 free( p_psm->es[p_psm->i_es]->p_descriptor );
428 free( p_psm->es[p_psm->i_es] );
430 if( p_psm->es ) free( p_psm->es );
436 static inline int ps_psm_fill( ps_psm_t *p_psm, block_t *p_pkt,
437 ps_track_t tk[PS_TK_COUNT], es_out_t *out )
439 int i_buffer = p_pkt->i_buffer;
440 uint8_t *p_buffer = p_pkt->p_buffer;
441 int i_length, i_version, i_info_length, i_esm_length, i_es_base, i;
443 if( !p_psm || p_buffer[3] != 0xbc ) return VLC_EGENERIC;
445 i_length = (uint16_t)(p_buffer[4] << 8) + p_buffer[5] + 6;
446 if( i_length > i_buffer ) return VLC_EGENERIC;
448 //i_current_next_indicator = (p_buffer[6] && 0x01);
449 i_version = (p_buffer[6] && 0xf8);
451 if( p_psm->i_version == i_version ) return VLC_EGENERIC;
453 ps_psm_destroy( p_psm );
455 i_info_length = (uint16_t)(p_buffer[8] << 8) + p_buffer[9];
456 if( i_info_length + 10 > i_length ) return VLC_EGENERIC;
458 /* Elementary stream map */
459 i_esm_length = (uint16_t)(p_buffer[ 10 + i_info_length ] << 8) +
460 p_buffer[ 11 + i_info_length];
461 i_es_base = 12 + i_info_length;
463 while( i_es_base + 4 < i_length )
466 es.lang[0] = es.lang[1] = es.lang[2] = 0;
468 es.i_type = p_buffer[ i_es_base ];
469 es.i_id = p_buffer[ i_es_base + 1 ];
470 i_info_length = (uint16_t)(p_buffer[ i_es_base + 2 ] << 8) +
471 p_buffer[ i_es_base + 3 ];
473 if( i_es_base + 4 + i_info_length > i_length ) break;
476 es.i_descriptor = i_info_length;
477 if( i_info_length > 0 )
481 es.p_descriptor = malloc( i_info_length );
482 memcpy( es.p_descriptor, p_buffer + i_es_base + 4, i_info_length);
484 while( i <= es.i_descriptor - 2 )
486 /* Look for the ISO639 language descriptor */
487 if( es.p_descriptor[i] != 0x0a )
489 i += es.p_descriptor[i+1] + 2;
493 if( i <= es.i_descriptor - 6 )
495 es.lang[0] = es.p_descriptor[i+2];
496 es.lang[1] = es.p_descriptor[i+3];
497 es.lang[2] = es.p_descriptor[i+4];
503 p_psm->es = realloc( p_psm->es, sizeof(ps_es_t *) * (p_psm->i_es+1) );
504 p_psm->es[p_psm->i_es] = malloc( sizeof(ps_es_t) );
505 *p_psm->es[p_psm->i_es++] = es;
506 i_es_base += 4 + i_info_length;
511 p_psm->i_version = i_version;
513 /* Check/Modify our existing tracks */
514 for( i = 0; i < PS_TK_COUNT; i++ )
518 if( !tk[i].b_seen || !tk[i].es ) continue;
520 if( ps_track_fill( &tk_tmp, p_psm, tk[i].i_id ) != VLC_SUCCESS )
523 if( tk_tmp.fmt.i_codec == tk[i].fmt.i_codec ) continue;
525 es_out_Del( out, tk[i].es );
527 tk[i].b_seen = VLC_TRUE;
528 tk[i].es = es_out_Add( out, &tk[i].fmt );