1 /*****************************************************************************
2 * ty.c - TiVo ty stream video demuxer for VLC
3 *****************************************************************************
4 * Copyright (C) 2005 the VideoLAN team
5 * Copyright (C) 2005 by Neal Symms (tivo@freakinzoo.com) - February 2005
6 * based on code by Christopher Wingert for tivo-mplayer
7 * tivo(at)wingert.org, February 2003
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
26 * v1.0.0 - 24-Feb-2005 - Initial release - Series 1 support ONLY!
27 * v1.0.1 - 25-Feb-2005 - Added fix for bad GOP headers - Neal
28 * v1.0.2 - 26-Feb-2005 - No longer require "seekable" input stream - Neal
29 *****************************************************************************/
31 /*****************************************************************************
33 *****************************************************************************/
36 #include <vlc_demux.h>
37 #include "vlc_codec.h"
39 #define SERIES1_PES_LENGTH (11)
40 #define SERIES2_PES_LENGTH (16)
41 #define AC3_PES_LENGTH (14)
42 #define DTIVO_PTS_OFFSET (6)
43 #define SA_PTS_OFFSET (9)
44 #define AC3_PTS_OFFSET (9)
45 static const unsigned char ty_VideoPacket[] = { 0x00, 0x00, 0x01, 0xe0 };
46 static const unsigned char ty_MPEGAudioPacket[] = { 0x00, 0x00, 0x01, 0xc0 };
47 static const unsigned char ty_AC3AudioPacket[] = { 0x00, 0x00, 0x01, 0xbd };
49 /*****************************************************************************
51 *****************************************************************************/
52 static int get_chunk_header(demux_t *);
53 static void setup_audio_streams(char, demux_t *);
54 static mtime_t get_pts( unsigned char *buf );
55 static int find_es_header( unsigned const char *header,
56 unsigned char *buffer, int bufferSize, int *esOffset1 );
57 static int ty_stream_seek(demux_t *p_demux, double seek_pct);
59 static int TyOpen (vlc_object_t *);
60 static void TyClose(vlc_object_t *);
61 static int TyDemux(demux_t *);
62 static int Control(demux_t *, int, va_list);
64 /*****************************************************************************
66 *****************************************************************************/
68 set_shortname( "TY" );
69 set_description(_("TY Stream audio/video demux"));
70 set_category( CAT_INPUT );
71 set_subcategory( SUBCAT_INPUT_DEMUX );
72 set_capability("demux2", 6);
73 /* FIXME: there seems to be a segfault when using PVR access
74 * and TY demux has a bigger priority than PS
75 * Something must be wrong.
77 set_callbacks(TyOpen, TyClose);
82 /* packet types for reference:
83 2/c0: audio data continued
84 3/c0: audio packet header (PES header)
85 4/c0: audio data (S/A only?)
86 9/c0: audio packet header, AC-3 audio
87 2/e0: video data continued
88 6/e0: video packet header (PES header)
89 7/e0: video sequence header start
90 8/e0: video I-frame header start
91 a/e0: video P-frame header start
92 b/e0: video B-frame header start
93 c/e0: video GOP header start
94 e/01: closed-caption data
95 e/02: Extended data services data
96 e/03: ipreview data ("thumbs up to record" signal)
99 #define TIVO_PES_FILEID ( 0xf5467abd )
100 #define TIVO_PART_LENGTH ( 0x20000000 ) /* 536,870,912 bytes */
101 #define CHUNK_SIZE ( 128 * 1024 )
106 unsigned char ex1, ex2;
107 unsigned char rec_type;
108 unsigned char subrec_type;
114 es_out_id_t *p_video; /* ptr to video codec */
115 es_out_id_t *p_audio; /* holds either ac3 or mpeg codec ptr */
119 size_t i_stream_size; /* size of input stream (if known) */
120 vlc_bool_t b_seekable; /* is this stream seekable? */
121 int tivoType; /* 1 = SA, 2 = DTiVo */
122 vlc_bool_t b_mpeg_audio; /* true if we're using MPEG audio */
123 uint8_t pes_buffer[20]; /* holds incomplete pes headers */
124 int i_pes_buf_cnt; /* how many bytes in our buffer */
126 mtime_t firstAudioPTS;
127 mtime_t lastAudioPTS;
128 mtime_t lastVideoPTS;
130 ty_rec_hdr_t *rec_hdrs; /* record headers array */
131 int i_cur_rec; /* current record in this chunk */
132 int i_num_recs; /* number of recs in this chunk */
133 int i_seq_rec; /* record number where seq start is */
135 vlc_bool_t b_first_chunk;
140 * TyOpen: check file and initialize demux structures
143 * 1. peek at the first 12 bytes of the stream for the
144 * magic TiVo PART header & stream type & chunk size
145 * 2. if it's not there, error with VLC_EGENERIC
146 * 3. set up video (mpgv) codec
147 * 4. return VLC_SUCCESS
149 static int TyOpen(vlc_object_t *p_this)
151 demux_t *p_demux = (demux_t *)p_this;
156 /* peek at the first 12 bytes. */
157 /* for TY streams, they're always the same */
158 if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
161 if ( U32_AT(p_peek) != TIVO_PES_FILEID ||
162 U32_AT(&p_peek[4]) != 0x02 ||
163 U32_AT(&p_peek[8]) != CHUNK_SIZE )
165 /* doesn't look like a TY file... */
166 char *psz_ext = strrchr(p_demux->psz_path, '.');
168 if( !p_demux->b_force &&
169 (!psz_ext || strcasecmp(psz_ext, ".ty")) ) return VLC_EGENERIC;
170 msg_Warn( p_demux, "this does not look like a TY file, "
171 "continuing anyway..." );
174 /* at this point, we assume we have a valid TY stream */
175 msg_Dbg( p_demux, "valid TY stream detected" );
177 /* Set exported functions */
178 p_demux->pf_demux = TyDemux;
179 p_demux->pf_control = Control;
181 /* create our structure that will hold all data */
182 p_demux->p_sys = p_sys = malloc(sizeof(demux_sys_t));
183 memset(p_sys, 0, sizeof(demux_sys_t));
185 /* set up our struct (most were zero'd out with the memset above) */
186 p_sys->b_first_chunk = VLC_TRUE;
187 p_sys->firstAudioPTS = -1;
188 p_sys->i_stream_size = stream_Size(p_demux->s);
189 p_sys->b_mpeg_audio = VLC_FALSE;
191 /* see if this stream is seekable */
192 stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
194 /* TODO: read first chunk & parse first audio PTS, then (if seekable)
195 * seek to last chunk & last record; read its PTS and compute
196 * overall program time. Also determine Tivo type. */
198 /* NOTE: we wait to create the audio ES until we know what
199 * audio type we have. */
200 p_sys->p_audio = NULL;
202 /* register the video stream */
203 es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
204 p_sys->p_video = es_out_Add( p_demux->out, &fmt );
207 /* register the CC decoder */
208 es_format_Init( &fmt, SPU_ES, VLC_FOURCC('s', 'u', 'b', 't'));
209 p_sys->p_subt_es = es_out_Add(p_demux->out, &fmt);
216 /* set up audio codec.
217 * this will be called once we determine audio type */
218 static void setup_audio_streams(char stream_type, demux_t *p_demux)
220 demux_sys_t *p_sys = p_demux->p_sys;
223 if (stream_type == 'A') {
224 /* AC3 audio detected */
225 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'a', '5', '2', ' ' ) );
226 p_sys->tivoType = 2; /* AC3 is only on dtivo */
229 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', 'g', 'a' ) );
230 p_sys->b_mpeg_audio = VLC_TRUE;
232 /* register the chosen audio output codec */
233 p_sys->p_audio = es_out_Add( p_demux->out, &fmt );
237 /* =========================================================================== */
238 /* Compute Presentation Time Stamp (PTS)
239 * Assume buf points to beginning of PTS */
240 static mtime_t get_pts( unsigned char *buf )
244 i_pts = ((mtime_t)(buf[0]&0x0e ) << 29)|
245 (mtime_t)(buf[1] << 22)|
246 ((mtime_t)(buf[2]&0xfe) << 14)|
247 (mtime_t)(buf[3] << 7)|
248 (mtime_t)(buf[4] >> 1);
249 i_pts *= 100 / 9; /* convert PTS (90Khz clock) to microseconds */
254 /* =========================================================================== */
255 static int find_es_header( unsigned const char *header,
256 unsigned char *buffer, int bufferSize, int *esOffset1 )
261 for( count = 0 ; count < bufferSize ; count++ )
263 if ( ( buffer[ count + 0 ] == header[ 0 ] ) &&
264 ( buffer[ count + 1 ] == header[ 1 ] ) &&
265 ( buffer[ count + 2 ] == header[ 2 ] ) &&
266 ( buffer[ count + 3 ] == header[ 3 ] ) )
276 /* =========================================================================== */
277 /* check if we have a full PES header, if not, then save what we have.
278 * this is called when audio-start packets are encountered.
280 * 1 partial PES hdr found, some audio data found (buffer adjusted),
281 * -1 partial PES hdr found, no audio data found
282 * 0 otherwise (complete PES found, pts extracted, pts set, buffer adjusted) */
283 /* TODO: fix it so it works with S2 / SA / DTivo / HD etc... */
284 static int check_sync_pes( demux_t *p_demux, block_t *p_block,
285 int32_t offset, int32_t rec_len )
287 demux_sys_t *p_sys = p_demux->p_sys;
289 int pes_length = p_sys->b_mpeg_audio?SERIES1_PES_LENGTH:AC3_PES_LENGTH;
291 if( p_sys->tivoType == 1 )
294 pts_offset = SA_PTS_OFFSET;
299 pts_offset = p_sys->b_mpeg_audio?DTIVO_PTS_OFFSET:AC3_PTS_OFFSET;
301 if ( offset < 0 || offset + pes_length > rec_len )
303 /* entire PES header not present */
304 msg_Dbg( p_demux, "PES header at %d not complete in record. storing.",
306 /* save the partial pes header */
309 /* no header found, fake some 00's (this works, believe me) */
310 memset( p_sys->pes_buffer, 0, 4 );
311 p_sys->i_pes_buf_cnt = 4;
313 msg_Err( p_demux, "PES header not found in record of %d bytes!",
317 /* copy the partial pes header we found */
318 memcpy( p_sys->pes_buffer, p_block->p_buffer + offset,
320 p_sys->i_pes_buf_cnt = rec_len - offset;
324 /* PES Header was found, but not complete, so trim the end of this record */
325 p_block->i_buffer -= rec_len - offset;
328 return -1; /* partial PES, no audio data */
330 /* full PES header present, extract PTS */
331 p_sys->lastAudioPTS = get_pts( &p_block->p_buffer[ offset + pts_offset ] );
332 if (p_sys->firstAudioPTS < 0)
333 p_sys->firstAudioPTS = p_sys->lastAudioPTS;
334 p_block->i_pts = p_sys->lastAudioPTS;
335 /*msg_Dbg(p_demux, "Audio PTS %lld", p_sys->lastAudioPTS );*/
336 /* adjust audio record to remove PES header */
337 memmove(p_block->p_buffer + offset, p_block->p_buffer + offset + pes_length,
338 rec_len - pes_length);
339 p_block->i_buffer -= pes_length;
344 /* =========================================================================== */
345 /* TyDemux: Read & Demux one record from the chunk
347 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
349 * NOTE: I think we can return the number of packets sent instead of just 1.
350 * that means we can demux an entire chunk and shoot it back (may be more efficient)
351 * -- should try that some day :) --
353 int TyDemux(demux_t *p_demux)
356 int recordsDecoded = 0;
362 ty_rec_hdr_t *rec_hdr;
364 block_t *p_block_in = NULL;
367 unsigned char lastCC[ 16 ];
368 unsigned char lastXDS[ 16 ];
370 demux_sys_t *p_sys = p_demux->p_sys;
372 /*msg_Dbg(p_demux, "ty demux processing" );*/
374 /* did we hit EOF earlier? */
375 if (p_sys->eof) return 0;
378 * what we do (1 record now.. maybe more later):
379 * - use stream_Read() to read the chunk header & record headers
380 * - discard entire chunk if it is a PART header chunk
381 * - parse all the headers into record header array
382 * - keep a pointer of which record we're on
383 * - use stream_Block() to fetch each record
384 * - parse out PTS from PES headers
385 * - set PTS for data packets
386 * - pass the data on to the proper codec via es_out_Send()
388 * if this is the first time or
389 * if we're at the end of this chunk, start a new one
391 /* parse the next chunk's record headers */
392 if (p_sys->b_first_chunk || p_sys->i_cur_rec >= p_sys->i_num_recs)
393 if (get_chunk_header(p_demux) == 0)
396 /*======================================================================
397 * parse & send one record of the chunk
398 *====================================================================== */
399 i_cur_rec = p_sys->i_cur_rec;
401 rec_hdr = &p_sys->rec_hdrs[ i_cur_rec ];
402 subrec_type = rec_hdr->subrec_type;
403 rec_type = rec_hdr->rec_type;
404 l_rec_size = rec_hdr->l_rec_size;
408 /*msg_Dbg(p_demux, "Record Type 0x%x/%02x %ld bytes",
409 subrec_type, rec_type, l_rec_size );*/
411 /* some normal records are 0 length, so check for that... */
414 /* read in this record's payload */
415 if( !( p_block_in = stream_Block( p_demux->s, l_rec_size ) ) )
421 /* set these as 'unknown' for now */
422 p_block_in->i_pts = p_block_in->i_dts = 0;
426 /* no data in payload; we're done */
433 -- don't read any data from the stream, data was in the record header --
435 "Record Type 0x%02x/%02x, ext data = %02x, %02x", subrec_type,
436 rec_type, rec_hdr->ex1, rec_hdr->ex2);
439 /*================================================================*
441 *================================================================*/
442 if ( rec_type == 0xe0 )
444 if( subrec_type == 0x06 )
446 /* get the PTS from this packet.
447 * Do NOT Pass this packet (a PES Header) on to the MPEG2 codec */
448 find_es_header( ty_VideoPacket, p_block_in->p_buffer,
449 l_rec_size, &esOffset1 );
450 if ( esOffset1 != -1 )
452 /* msg_Dbg(p_demux, "Video PES hdr at offset %d", esOffset1); */
453 p_sys->lastVideoPTS = get_pts( &p_block_in->p_buffer[ esOffset1 + 9 ] );
454 /*msg_Dbg(p_demux, "Video rec %d PTS "I64Fd, p_sys->i_cur_rec,
455 p_sys->lastVideoPTS );*/
457 block_Release(p_block_in);
462 msg_Dbg(p_demux, "packet buffer has "
463 "%02x %02x %02x %02x %02x %02x %02x %02x "
464 "%02x %02x %02x %02x %02x %02x %02x %02x",
465 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
466 p_block_in->p_buffer[2], p_block_in->p_buffer[3],
467 p_block_in->p_buffer[4], p_block_in->p_buffer[5],
468 p_block_in->p_buffer[6], p_block_in->p_buffer[7],
469 p_block_in->p_buffer[8], p_block_in->p_buffer[9],
470 p_block_in->p_buffer[10], p_block_in->p_buffer[11],
471 p_block_in->p_buffer[12], p_block_in->p_buffer[13],
472 p_block_in->p_buffer[14], p_block_in->p_buffer[15]);
474 /* if it's not a continue blk, then set PTS */
475 if (subrec_type != 0x02)
477 /*msg_Dbg(p_demux, "Video rec %d type 0x%02X", p_sys->i_cur_rec,
479 /* if it's a GOP header, make sure it's legal
480 * (if we have enough data) */
481 /* Some ty files don't have this bit set
482 * and it causes problems */
483 if (subrec_type == 0x0c && l_rec_size >= 6)
484 p_block_in->p_buffer[5] |= 0x08;
485 /* set PTS for this block before we send */
486 if (p_sys->lastVideoPTS > 0)
488 p_block_in->i_pts = p_sys->lastVideoPTS;
489 /* PTS gets used ONCE.
490 * Any subsequent frames we get BEFORE next PES
491 * header will have their PTS computed in the codec */
492 p_sys->lastVideoPTS = 0;
495 es_out_Send(p_demux->out, p_sys->p_video, p_block_in);
497 } /* end if video rec type */
498 /* ================================================================
500 * ================================================================
501 * parse PES headers and send the rest to the codec
503 else if ( rec_type == 0xc0 )
507 printf( "Audio Packet Header " );
508 for( i = 0 ; i < 24 ; i++ )
509 printf( "%2.2x ", p_block_in->p_buffer[i] );
512 /* load a codec if we haven't yet */
513 if ( p_sys->p_audio == NULL )
515 if ( subrec_type == 0x09 )
517 /* set up for AC-3 audio */
518 msg_Dbg(p_demux, "detected AC-3 Audio" );
519 setup_audio_streams('A', p_demux);
523 /* set up for MPEG audio */
524 msg_Dbg(p_demux, "detected MPEG Audio" );
525 setup_audio_streams('M', p_demux);
529 /* SA or DTiVo Audio Data, no PES (continued block)
530 * ================================================
532 if ( subrec_type == 2 )
534 /* continue PES if previous was incomplete */
535 /* TODO: Make this work for all series & types of tivos */
536 if (p_sys->i_pes_buf_cnt > 0)
538 int i_need = SERIES1_PES_LENGTH - p_sys->i_pes_buf_cnt;
540 msg_Dbg(p_demux, "continuing PES header");
541 /* do we have enough data to complete? */
542 if (i_need < l_rec_size)
544 /* we have enough; reconstruct this p_frame with the new hdr */
545 memcpy(&p_sys->pes_buffer[p_sys->i_pes_buf_cnt],
546 p_block_in->p_buffer, i_need);
547 /* advance the block past the PES header (don't want to send it) */
548 p_block_in->p_buffer += i_need;
549 p_block_in->i_buffer -= i_need;
550 /* get the PTS out of this PES header (MPEG or AC3) */
551 if (p_sys->b_mpeg_audio)
552 find_es_header(ty_MPEGAudioPacket, p_sys->pes_buffer,
555 find_es_header(ty_AC3AudioPacket, p_sys->pes_buffer,
559 /* god help us; something's really wrong */
560 msg_Err(p_demux, "can't find audio PES header in packet");
564 p_sys->lastAudioPTS = get_pts(
565 &p_sys->pes_buffer[ esOffset1 + DTIVO_PTS_OFFSET ] );
566 p_block_in->i_pts = p_sys->lastAudioPTS;
568 p_sys->i_pes_buf_cnt = 0;
572 /* don't have complete PES hdr; save what we have and return */
573 memcpy(&p_sys->pes_buffer[p_sys->i_pes_buf_cnt],
574 p_block_in->p_buffer, l_rec_size);
575 p_sys->i_pes_buf_cnt += l_rec_size;
577 block_Release(p_block_in);
581 /* set PCR before we send */
582 /*es_out_Control( p_demux->out, ES_OUT_SET_PCR,
583 p_block_in->i_pts );*/
584 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
587 /* MPEG Audio with PES Header, either SA or DTiVo */
588 /* ================================================ */
589 if ( subrec_type == 0x03 )
591 find_es_header( ty_MPEGAudioPacket, p_block_in->p_buffer,
592 l_rec_size, &esOffset1 );
594 /*msg_Dbg(p_demux, "buffer has %#02x %#02x %#02x %#02x",
595 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
596 p_block_in->p_buffer[2], p_block_in->p_buffer[3]);
597 msg_Dbg(p_demux, "audio ES hdr at offset %d", esOffset1);*/
599 /* SA PES Header, No Audio Data */
600 /* ================================================ */
601 if ( ( esOffset1 == 0 ) && ( l_rec_size == 16 ) )
604 p_sys->lastAudioPTS = get_pts( &p_block_in->p_buffer[
606 if (p_sys->firstAudioPTS < 0)
607 p_sys->firstAudioPTS = p_sys->lastAudioPTS;
608 block_Release(p_block_in);
609 /*msg_Dbg(p_demux, "SA Audio PTS %lld",
610 p_sys->lastAudioPTS );*/
613 /* DTiVo Audio with PES Header */
614 /* ================================================ */
618 /* Check for complete PES
619 * (TODO: handle proper size for tivo version) */
620 if (check_sync_pes(p_demux, p_block_in, esOffset1,
623 /* partial PES header found, nothing else.
626 block_Release(p_block_in);
630 msg_Dbg(p_demux, "packet buffer has "
631 "%02x %02x %02x %02x %02x %02x %02x %02x "
632 "%02x %02x %02x %02x %02x %02x %02x %02x",
633 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
634 p_block_in->p_buffer[2], p_block_in->p_buffer[3],
635 p_block_in->p_buffer[4], p_block_in->p_buffer[5],
636 p_block_in->p_buffer[6], p_block_in->p_buffer[7],
637 p_block_in->p_buffer[8], p_block_in->p_buffer[9],
638 p_block_in->p_buffer[10], p_block_in->p_buffer[11],
639 p_block_in->p_buffer[12], p_block_in->p_buffer[13],
640 p_block_in->p_buffer[14], p_block_in->p_buffer[15]);
642 /* set PCR before we send */
643 if( p_block_in->i_pts > 0 )
644 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
646 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
648 } /* if subrec == 0x03 */
650 /* SA Audio with no PES Header */
651 /* ================================================ */
652 if ( subrec_type == 0x04 )
655 "Adding SA Audio Packet Size %ld", l_rec_size ); */
657 /* set PCR before we send */
658 if (p_sys->lastAudioPTS > 0)
660 p_block_in->i_pts = p_sys->lastAudioPTS;
661 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
664 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
667 /* DTiVo AC3 Audio Data with PES Header */
668 /* ================================================ */
669 if ( subrec_type == 0x09 )
671 find_es_header( ty_AC3AudioPacket, p_block_in->p_buffer,
672 l_rec_size, &esOffset1 );
674 /*msg_Dbg(p_demux, "buffer has %#02x %#02x %#02x %#02x",
675 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
676 p_block_in->p_buffer[2], p_block_in->p_buffer[3]);
677 msg_Dbg(p_demux, "audio ES AC3 hdr at offset %d", esOffset1);*/
679 /* Check for complete PES */
680 if (check_sync_pes(p_demux, p_block_in, esOffset1,
683 /* partial PES header found, nothing else. we're done. */
687 /* set PCR before we send (if PTS found) */
688 if( p_block_in->i_pts > 0 )
690 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
693 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
695 } /* end "if audio" */
696 /* ================================================================ */
698 /* ================================================================ */
699 else if ( rec_type == 0x01 )
701 /*msg_Dbg(p_demux, "CC1 %02x %02x [%c%c]", rec_hdr->ex1,
702 rec_hdr->ex2, rec_hdr->ex1, rec_hdr->ex2 );*/
704 /* construct a 'user-data' MPEG packet */
705 lastCC[ 0x00 ] = 0x00;
706 lastCC[ 0x01 ] = 0x00;
707 lastCC[ 0x02 ] = 0x01;
708 lastCC[ 0x03 ] = 0xb2;
709 lastCC[ 0x04 ] = 'T'; /* vcdimager code says this byte should be 0x11 */
710 lastCC[ 0x05 ] = 'Y'; /* (no other notes there) */
711 lastCC[ 0x06 ] = 0x01;
712 lastCC[ 0x07 ] = rec_hdr->ex1;
713 lastCC[ 0x08 ] = rec_hdr->ex2;
714 /* not sure what to send, because VLC doesn't yet support
715 * teletext type of subtitles (only supports the full-sentence type) */
716 /*p_block_in = block_NewEmpty(); ????
717 es_out_Send( p_demux->out, p_sys->p_subt_es, p_block_in );*/
719 else if ( rec_type == 0x02 )
721 /*msg_Dbg(p_demux, "CC2 %02x %02x", rec_hdr->ex1, rec_hdr->ex2 );*/
723 /* construct a 'user-data' MPEG packet */
724 lastXDS[ 0x00 ] = 0x00;
725 lastXDS[ 0x01 ] = 0x00;
726 lastXDS[ 0x02 ] = 0x01;
727 lastXDS[ 0x03 ] = 0xb2;
728 lastXDS[ 0x04 ] = 'T'; /* vcdimager code says this byte should be 0x11 */
729 lastXDS[ 0x05 ] = 'Y'; /* (no other notes there) */
730 lastXDS[ 0x06 ] = 0x02;
731 lastXDS[ 0x07 ] = rec_hdr->ex1;
732 lastXDS[ 0x08 ] = rec_hdr->ex2;
733 /* not sure what to send, because VLC doesn't support this?? */
734 /*p_block_in = block_NewEmpty(); ????
735 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );*/
737 /* ================================================================ */
738 /* Tivo data services (e.g. "thumbs-up to record!") useless for us */
739 /* ================================================================ */
740 else if ( rec_type == 0x03 )
743 /* ================================================================ */
744 /* Unknown, but seen regularly */
745 /* ================================================================ */
746 else if ( rec_type == 0x05 )
751 msg_Dbg(p_demux, "Invalid record type 0x%02x", rec_type );
752 if (p_block_in) block_Release(p_block_in);
760 /* seek to a position within the stream, if possible */
761 static int ty_stream_seek(demux_t *p_demux, double seek_pct)
763 demux_sys_t *p_sys = p_demux->p_sys;
764 int64_t seek_pos = p_sys->i_stream_size * seek_pct;
768 /* if we're not seekable, there's nothing to do */
769 if (!p_sys->b_seekable)
772 /* figure out which chunk we want & go there */
773 p_sys->i_chunk_count = seek_pos / CHUNK_SIZE;
775 if ( stream_Seek( p_demux->s, p_sys->i_chunk_count * CHUNK_SIZE))
777 /* can't seek stream */
781 get_chunk_header(p_demux);
783 /* seek within the chunk to get roughly to where we want */
784 p_sys->i_cur_rec = (int)
785 ((double) ((seek_pos % CHUNK_SIZE) / (double) (CHUNK_SIZE)) * p_sys->i_num_recs);
786 msg_Dbg(p_demux, "seeked to file pos " I64Fd, seek_pos);
787 msg_Dbg(p_demux, " (chunk %d, record %d)",
788 p_sys->i_chunk_count - 1, p_sys->i_cur_rec);
790 /* seek to the start of this record's data.
791 * to do that, we have to skip past all prior records */
793 for (i=0; i<p_sys->i_cur_rec; i++)
794 l_skip_amt += p_sys->rec_hdrs[i].l_rec_size;
795 stream_Seek(p_demux->s, ((p_sys->i_chunk_count-1) * CHUNK_SIZE) +
796 (p_sys->i_num_recs * 16) + l_skip_amt + 4);
798 /* to hell with syncing any audio or video, just start reading records... :) */
799 /*p_sys->lastAudioPTS = p_sys->lastVideoPTS = 0;*/
800 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
805 static int Control(demux_t *p_demux, int i_query, va_list args)
807 demux_sys_t *p_sys = p_demux->p_sys;
811 /*msg_Info(p_demux, "control cmd %d", i_query);*/
814 case DEMUX_GET_POSITION:
815 /* arg is 0.0 - 1.0 percent of overall file position */
816 if( ( i64 = p_sys->i_stream_size ) > 0 )
818 pf = (double*) va_arg( args, double* );
819 *pf = (double)stream_Tell( p_demux->s ) / (double) i64;
824 case DEMUX_SET_POSITION:
825 /* arg is 0.0 - 1.0 percent of overall file position */
826 f = (double) va_arg( args, double );
827 //msg_Dbg(p_demux, "Control - set position to %2.3f", f);
828 if ((i64 = p_sys->i_stream_size) > 0)
829 return ty_stream_seek(p_demux, f);
832 /* return latest PTS - start PTS */
833 p_i64 = (int64_t *) va_arg(args, int64_t *);
834 *p_i64 = p_sys->lastAudioPTS - p_sys->firstAudioPTS;
836 case DEMUX_SET_TIME: /* arg is time in microsecs */
837 case DEMUX_GET_LENGTH: /* length of program in microseconds, 0 if unk */
845 /* =========================================================================== */
846 static void TyClose( vlc_object_t *p_this )
848 demux_sys_t *p_sys = ((demux_t *) p_this)->p_sys;
850 free(p_sys->rec_hdrs);
855 /* =========================================================================== */
856 static int get_chunk_header(demux_t *p_demux)
858 int i_readSize, i_num_recs, i;
859 uint8_t packet_header[4];
860 uint8_t record_header[16];
861 ty_rec_hdr_t *p_rec_hdr;
862 demux_sys_t *p_sys = p_demux->p_sys;
863 int i_payload_size = 0; /* sum of all records */
865 msg_Dbg(p_demux, "parsing ty chunk #%d", p_sys->i_chunk_count );
867 /* if we have left-over filler space from the last chunk, get that */
868 if (p_sys->i_stuff_cnt > 0)
869 stream_Read( p_demux->s, NULL, p_sys->i_stuff_cnt);
871 /* read the TY packet header */
872 i_readSize = stream_Read( p_demux->s, packet_header, 4 );
873 p_sys->i_chunk_count++;
875 if ( i_readSize < 4 )
882 /* if it's a PART Header, then try again. */
883 if( U32_AT( &packet_header[ 0 ] ) == TIVO_PES_FILEID )
885 msg_Dbg( p_demux, "skipping TY PART Header" );
886 /* TODO: if stream is seekable, should we seek() instead of read() ?? */
887 stream_Read( p_demux->s, NULL, CHUNK_SIZE - 4 );
888 return get_chunk_header(p_demux);
891 /* number of records in chunk (8- or 16-bit number) */
892 if (packet_header[3] & 0x80)
895 p_sys->i_num_recs = i_num_recs = (packet_header[1] << 8) + packet_header[0];
896 p_sys->i_seq_rec = (packet_header[3] << 8) + packet_header[2];
897 if (p_sys->i_seq_rec != 0xffff)
899 p_sys->i_seq_rec &= ~0x8000;
904 /* 8 bit reclen - tivo 1.3 format */
905 p_sys->i_num_recs = i_num_recs = packet_header[0];
906 p_sys->i_seq_rec = packet_header[1];
908 p_sys->i_cur_rec = 0;
909 p_sys->b_first_chunk = VLC_FALSE;
911 /*msg_Dbg( p_demux, "chunk has %d records", i_num_recs );*/
913 /* parse headers into array */
915 free(p_sys->rec_hdrs);
916 p_sys->rec_hdrs = malloc(i_num_recs * sizeof(ty_rec_hdr_t));
917 for (i = 0; i < i_num_recs; i++)
919 i_readSize = stream_Read( p_demux->s, record_header, 16 );
923 p_sys->eof = VLC_TRUE;
926 p_rec_hdr = &p_sys->rec_hdrs[i]; /* for brevity */
927 p_rec_hdr->rec_type = record_header[3];
928 p_rec_hdr->subrec_type = record_header[2] & 0x0f;
929 if ((record_header[ 0 ] & 0x80) == 0x80)
931 unsigned char b1, b2;
932 /* marker bit 2 set, so read extended data */
933 b1 = ( ( ( record_header[ 0 ] & 0x0f ) << 4 ) |
934 ( ( record_header[ 1 ] & 0xf0 ) >> 4 ) );
936 b2 = ( ( ( record_header[ 1 ] & 0x0f ) << 4 ) |
937 ( ( record_header[ 2 ] & 0xf0 ) >> 4 ) );
942 p_rec_hdr->l_rec_size = 0;
943 p_rec_hdr->b_ext = VLC_TRUE;
947 p_rec_hdr->l_rec_size = ( record_header[ 0 ] << 8 |
948 record_header[ 1 ] ) << 4 | ( record_header[ 2 ] >> 4 );
949 i_payload_size += p_rec_hdr->l_rec_size;
950 p_rec_hdr->b_ext = VLC_FALSE;
952 } /* end of record-header loop */
953 p_sys->i_stuff_cnt = CHUNK_SIZE - 4 -
954 (p_sys->i_num_recs * 16) - i_payload_size;
955 if (p_sys->i_stuff_cnt > 0)
956 msg_Dbg( p_demux, "chunk has %d stuff bytes at end",
957 p_sys->i_stuff_cnt );