1 /*****************************************************************************
2 * ps.h: Program Stream demuxer helper
3 *****************************************************************************
4 * Copyright (C) 2004 VideoLAN (Centrale Réseaux) and its contributors
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 );
30 static inline char *ps_id_to_lang( ps_psm_t *, int );
42 /* Init a set of track */
43 static inline void ps_track_init( ps_track_t tk[PS_TK_COUNT] )
46 for( i = 0; i < PS_TK_COUNT; i++ )
48 tk[i].b_seen = VLC_FALSE;
52 es_format_Init( &tk[i].fmt, UNKNOWN_ES, 0 );
56 /* From id fill i_skip and es_format_t */
57 static inline int ps_track_fill( ps_track_t *tk, ps_psm_t *p_psm, int i_id )
61 if( ( i_id&0xff00 ) == 0xbd00 )
63 if( ( i_id&0xf8 ) == 0x88 )
65 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('d','t','s',' ') );
68 else if( ( i_id&0xf0 ) == 0x80 )
70 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('a','5','2',' ') );
73 else if( ( i_id&0xe0 ) == 0x20 )
75 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('s','p','u',' ') );
78 else if( ( i_id&0xf0 ) == 0xa0 )
80 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('l','p','c','m') );
83 else if( ( i_id&0xff ) == 0x70 )
85 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('o','g','t',' ') );
87 else if( ( i_id&0xfc ) == 0x00 )
89 es_format_Init( &tk->fmt, SPU_ES, VLC_FOURCC('c','v','d',' ') );
93 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
99 int i_type = ps_id_to_type( p_psm , i_id );
101 es_format_Init( &tk->fmt, UNKNOWN_ES, 0 );
103 if( (i_id&0xf0) == 0xe0 && i_type == 0x1b )
105 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('h','2','6','4') );
107 else if( (i_id&0xf0) == 0xe0 && i_type == 0x10 )
109 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','4','v') );
111 else if( (i_id&0xf0) == 0xe0 && i_type == 0x02 )
113 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
115 else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x0f )
117 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','4','a') );
119 else if( ( i_id&0xe0 ) == 0xc0 && i_type == 0x03 )
121 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
124 if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xf0 ) == 0xe0 )
126 es_format_Init( &tk->fmt, VIDEO_ES, VLC_FOURCC('m','p','g','v') );
128 else if( tk->fmt.i_cat == UNKNOWN_ES && ( i_id&0xe0 ) == 0xc0 )
130 es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('m','p','g','a') );
132 else if( tk->fmt.i_cat == UNKNOWN_ES ) return VLC_EGENERIC;
135 /* PES packets usually contain truncated frames */
136 tk->fmt.b_packetized = VLC_FALSE;
138 if( ps_id_to_lang( p_psm , i_id ) )
140 tk->fmt.psz_language = malloc( 4 );
141 memcpy( tk->fmt.psz_language, ps_id_to_lang( p_psm , i_id ), 3 );
142 tk->fmt.psz_language[3] = 0;
148 /* return the id of a PES (should be valid) */
149 static inline int ps_pkt_id( block_t *p_pkt )
151 if( p_pkt->p_buffer[3] == 0xbd &&
152 p_pkt->i_buffer >= 9 &&
153 p_pkt->i_buffer >= 9 + p_pkt->p_buffer[8] )
155 return 0xbd00 | p_pkt->p_buffer[9+p_pkt->p_buffer[8]];
157 return p_pkt->p_buffer[3];
160 /* return the size of the next packet
161 * XXX you need to give him at least 14 bytes (and it need to start as a
163 static inline int ps_pkt_size( uint8_t *p, int i_peek )
165 if( p[3] == 0xb9 && i_peek >= 4 )
169 else if( p[3] == 0xba )
171 if( (p[4] >> 6) == 0x01 && i_peek >= 14 )
173 return 14 + (p[13]&0x07);
175 else if( (p[4] >> 4) == 0x02 && i_peek >= 12 )
181 else if( i_peek >= 6 )
183 return 6 + ((p[4]<<8) | p[5] );
188 /* parse a PACK PES */
189 static inline int ps_pkt_parse_pack( block_t *p_pkt, int64_t *pi_scr,
192 uint8_t *p = p_pkt->p_buffer;
193 if( p_pkt->i_buffer >= 14 && (p[4] >> 6) == 0x01 )
195 *pi_scr =((((int64_t)p[4]&0x38) << 27 )|
196 (((int64_t)p[4]&0x03) << 28 )|
197 ((int64_t)p[5] << 20 )|
198 (((int64_t)p[6]&0xf8) << 12 )|
199 (((int64_t)p[6]&0x03) << 13 )|
200 ((int64_t)p[7] << 5 )|
201 ((int64_t)p[8] >> 3 )) * 100 / 9;
203 *pi_mux_rate = ( p[10] << 14 )|( p[11] << 6 )|( p[12] >> 2);
205 else if( p_pkt->i_buffer >= 12 && (p[4] >> 4) == 0x02 )
207 *pi_scr =((((int64_t)p[4]&0x0e) << 29 )|
208 ((int64_t)p[5] << 22 )|
209 (((int64_t)p[6]&0xfe) << 14 )|
210 ((int64_t)p[7] << 7 )|
211 ((int64_t)p[8] >> 1 )) * 100 / 9;
213 *pi_mux_rate = ( ( p[9]&0x7f )<< 15 )|( p[10] << 7 )|( p[11] >> 1);
222 /* Parse a SYSTEM PES */
223 static inline int ps_pkt_parse_system( block_t *p_pkt, ps_psm_t *p_psm,
224 ps_track_t tk[PS_TK_COUNT] )
226 uint8_t *p = &p_pkt->p_buffer[6 + 3 + 1 + 1 + 1];
228 /* System header is not useable if it references private streams (0xBD)
229 * or 'all audio streams' (0xB8) or 'all video streams' (0xB9) */
230 while( p < &p_pkt->p_buffer[p_pkt->i_buffer] )
234 /* fprintf( stderr, " SYSTEM_START_CODEEE: id=0x%x\n", p[0] ); */
235 if( p[0] >= 0xBC || p[0] == 0xB8 || p[0] == 0xB9 ) p += 2;
240 int i_tk = PS_ID_TO_TK( i_id );
242 if( !tk[i_tk].b_seen )
244 if( !ps_track_fill( &tk[i_tk], p_psm, i_id ) )
246 tk[i_tk].b_seen = VLC_TRUE;
254 /* Parse a PES (and skip i_skip_extra in the payload) */
255 static inline int ps_pkt_parse_pes( block_t *p_pes, int i_skip_extra )
260 memcpy( header, p_pes->p_buffer, __MIN( p_pes->i_buffer, 30 ) );
264 case 0xBC: /* Program stream map */
265 case 0xBE: /* Padding */
266 case 0xBF: /* Private stream 2 */
269 case 0xFF: /* Program stream directory */
270 case 0xF2: /* DSMCC stream */
271 case 0xF8: /* ITU-T H.222.1 type E stream */
276 if( ( header[6]&0xC0 ) == 0x80 )
279 i_skip = header[8] + 9;
281 if( header[7]&0x80 ) /* has pts */
283 p_pes->i_pts = ((mtime_t)(header[ 9]&0x0e ) << 29)|
284 (mtime_t)(header[10] << 22)|
285 ((mtime_t)(header[11]&0xfe) << 14)|
286 (mtime_t)(header[12] << 7)|
287 (mtime_t)(header[13] >> 1);
289 if( header[7]&0x40 ) /* has dts */
291 p_pes->i_dts = ((mtime_t)(header[14]&0x0e ) << 29)|
292 (mtime_t)(header[15] << 22)|
293 ((mtime_t)(header[16]&0xfe) << 14)|
294 (mtime_t)(header[17] << 7)|
295 (mtime_t)(header[18] >> 1);
302 while( i_skip < 23 && header[i_skip] == 0xff )
308 /* msg_Err( p_demux, "too much MPEG-1 stuffing" ); */
311 if( ( header[i_skip] & 0xC0 ) == 0x40 )
316 if( header[i_skip]&0x20 )
318 p_pes->i_pts = ((mtime_t)(header[i_skip]&0x0e ) << 29)|
319 (mtime_t)(header[i_skip+1] << 22)|
320 ((mtime_t)(header[i_skip+2]&0xfe) << 14)|
321 (mtime_t)(header[i_skip+3] << 7)|
322 (mtime_t)(header[i_skip+4] >> 1);
324 if( header[i_skip]&0x10 ) /* has dts */
326 p_pes->i_dts = ((mtime_t)(header[i_skip+5]&0x0e ) << 29)|
327 (mtime_t)(header[i_skip+6] << 22)|
328 ((mtime_t)(header[i_skip+7]&0xfe) << 14)|
329 (mtime_t)(header[i_skip+8] << 7)|
330 (mtime_t)(header[i_skip+9] >> 1);
345 i_skip += i_skip_extra;
347 if( p_pes->i_buffer <= i_skip )
352 p_pes->p_buffer += i_skip;
353 p_pes->i_buffer -= i_skip;
355 p_pes->i_dts = 100 * p_pes->i_dts / 9;
356 p_pes->i_pts = 100 * p_pes->i_pts / 9;
361 /* Program stream map handling */
362 typedef struct ps_es_t
368 uint8_t *p_descriptor;
370 /* Language is iso639-2T */
383 static inline int ps_id_to_type( ps_psm_t *p_psm, int i_id )
386 for( i = 0; p_psm && i < p_psm->i_es; i++ )
388 if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->i_type;
393 static inline char *ps_id_to_lang( ps_psm_t *p_psm, int i_id )
396 for( i = 0; p_psm && i < p_psm->i_es; i++ )
398 if( p_psm->es[i]->i_id == i_id ) return p_psm->es[i]->lang;
403 static inline void ps_psm_init( ps_psm_t *p_psm )
405 p_psm->i_version = 0xFFFF;
410 static inline void ps_psm_destroy( ps_psm_t *p_psm )
412 while( p_psm->i_es-- )
414 if( p_psm->es[p_psm->i_es]->i_descriptor )
415 free( p_psm->es[p_psm->i_es]->p_descriptor );
416 free( p_psm->es[p_psm->i_es] );
418 if( p_psm->es ) free( p_psm->es );
424 static inline int ps_psm_fill( ps_psm_t *p_psm, block_t *p_pkt,
425 ps_track_t tk[PS_TK_COUNT], es_out_t *out )
427 int i_buffer = p_pkt->i_buffer;
428 uint8_t *p_buffer = p_pkt->p_buffer;
429 int i_length, i_version, i_info_length, i_esm_length, i_es_base, i;
431 if( !p_psm || p_buffer[3] != 0xbc ) return VLC_EGENERIC;
433 i_length = (uint16_t)(p_buffer[4] << 8) + p_buffer[5] + 6;
434 if( i_length > i_buffer ) return VLC_EGENERIC;
436 //i_current_next_indicator = (p_buffer[6] && 0x01);
437 i_version = (p_buffer[6] && 0xf8);
439 if( p_psm->i_version == i_version ) return VLC_EGENERIC;
441 ps_psm_destroy( p_psm );
443 i_info_length = (uint16_t)(p_buffer[8] << 8) + p_buffer[9];
444 if( i_info_length + 10 > i_length ) return VLC_EGENERIC;
446 /* Elementary stream map */
447 i_esm_length = (uint16_t)(p_buffer[ 10 + i_info_length ] << 8) +
448 p_buffer[ 11 + i_info_length];
449 i_es_base = 12 + i_info_length;
451 while( i_es_base + 4 < i_length )
454 es.lang[0] = es.lang[1] = es.lang[2] = 0;
456 es.i_type = p_buffer[ i_es_base ];
457 es.i_id = p_buffer[ i_es_base + 1 ];
458 i_info_length = (uint16_t)(p_buffer[ i_es_base + 2 ] << 8) +
459 p_buffer[ i_es_base + 3 ];
461 if( i_es_base + 4 + i_info_length > i_length ) break;
464 es.i_descriptor = i_info_length;
465 if( i_info_length > 0 )
469 es.p_descriptor = malloc( i_info_length );
470 memcpy( es.p_descriptor, p_buffer + i_es_base + 4, i_info_length);
472 while( i <= es.i_descriptor - 2 )
474 /* Look for the ISO639 language descriptor */
475 if( es.p_descriptor[i] != 0x0a )
477 i += es.p_descriptor[i+1] + 2;
481 if( i <= es.i_descriptor - 6 )
483 es.lang[0] = es.p_descriptor[i+2];
484 es.lang[1] = es.p_descriptor[i+3];
485 es.lang[2] = es.p_descriptor[i+4];
491 p_psm->es = realloc( p_psm->es, sizeof(ps_es_t *) * (p_psm->i_es+1) );
492 p_psm->es[p_psm->i_es] = malloc( sizeof(ps_es_t) );
493 *p_psm->es[p_psm->i_es++] = es;
494 i_es_base += 4 + i_info_length;
499 p_psm->i_version = i_version;
501 /* Check/Modify our existing tracks */
502 for( i = 0; i < PS_TK_COUNT; i++ )
506 if( !tk[i].b_seen || !tk[i].es ) continue;
508 if( ps_track_fill( &tk_tmp, p_psm, tk[i].i_id ) != VLC_SUCCESS )
511 if( tk_tmp.fmt.i_codec == tk[i].fmt.i_codec ) continue;
513 es_out_Del( out, tk[i].es );
515 tk[i].b_seen = VLC_TRUE;
516 tk[i].es = es_out_Add( out, &tk[i].fmt );