1 /*****************************************************************************
2 * ty.c - TiVo ty stream video demuxer for VLC
3 *****************************************************************************
4 * Copyright (C) 2005 VideoLAN
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., 59 Temple Place - Suite 330, Boston, MA 02111, 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 *****************************************************************************/
37 #include <vlc/input.h>
38 #include "vlc_codec.h"
40 #define SERIES1_PES_LENGTH (11)
41 #define SERIES2_PES_LENGTH (16)
42 #define AC3_PES_LENGTH (14)
43 #define DTIVO_PTS_OFFSET (6)
44 #define SA_PTS_OFFSET (9)
45 #define AC3_PTS_OFFSET (9)
46 static const unsigned char ty_VideoPacket[] = { 0x00, 0x00, 0x01, 0xe0 };
47 static const unsigned char ty_MPEGAudioPacket[] = { 0x00, 0x00, 0x01, 0xc0 };
48 static const unsigned char ty_AC3AudioPacket[] = { 0x00, 0x00, 0x01, 0xbd };
50 /*****************************************************************************
52 *****************************************************************************/
53 static int get_chunk_header(demux_t *);
54 static void setup_audio_streams(char, demux_t *);
55 static mtime_t get_pts( unsigned char *buf );
56 static int find_es_header( unsigned const char *header,
57 unsigned char *buffer, int bufferSize, int *esOffset1 );
58 static int ty_stream_seek(demux_t *p_demux, double seek_pct);
60 static int TyOpen (vlc_object_t *);
61 static void TyClose(vlc_object_t *);
62 static int TyDemux(demux_t *);
63 static int Control(demux_t *, int, va_list);
65 /*****************************************************************************
67 *****************************************************************************/
69 set_shortname( _("TY") );
70 set_description(_("TY Stream audio/video demux"));
71 set_category( CAT_INPUT );
72 set_subcategory( SUBCAT_INPUT_DEMUX );
73 set_capability("demux2", 10);
74 set_callbacks(TyOpen, TyClose);
79 /* packet types for reference:
80 2/c0: audio data continued
81 3/c0: audio packet header (PES header)
82 4/c0: audio data (S/A only?)
83 9/c0: audio packet header, AC-3 audio
84 2/e0: video data continued
85 6/e0: video packet header (PES header)
86 7/e0: video sequence header start
87 8/e0: video I-frame header start
88 a/e0: video P-frame header start
89 b/e0: video B-frame header start
90 c/e0: video GOP header start
91 e/01: closed-caption data
92 e/02: Extended data services data
93 e/03: ipreview data ("thumbs up to record" signal)
96 #define TIVO_PES_FILEID ( 0xf5467abd )
97 #define TIVO_PART_LENGTH ( 0x20000000 ) /* 536,870,912 bytes */
98 #define CHUNK_SIZE ( 128 * 1024 )
103 unsigned char ex1, ex2;
104 unsigned char rec_type;
105 unsigned char subrec_type;
111 es_out_id_t *p_video; /* ptr to video codec */
112 es_out_id_t *p_audio; /* holds either ac3 or mpeg codec ptr */
116 size_t i_stream_size; /* size of input stream (if known) */
117 vlc_bool_t b_seekable; /* is this stream seekable? */
118 int tivoType; /* 1 = SA, 2 = DTiVo */
119 vlc_bool_t b_mpeg_audio; /* true if we're using MPEG audio */
120 uint8_t pes_buffer[20]; /* holds incomplete pes headers */
121 int i_pes_buf_cnt; /* how many bytes in our buffer */
123 mtime_t firstAudioPTS;
124 mtime_t lastAudioPTS;
125 mtime_t lastVideoPTS;
127 ty_rec_hdr_t *rec_hdrs; /* record headers array */
128 int i_cur_rec; /* current record in this chunk */
129 int i_num_recs; /* number of recs in this chunk */
130 int i_seq_rec; /* record number where seq start is */
132 vlc_bool_t b_first_chunk;
137 * TyOpen: check file and initialize demux structures
140 * 1. peek at the first 12 bytes of the stream for the
141 * magic TiVo PART header & stream type & chunk size
142 * 2. if it's not there, error with VLC_EGENERIC
143 * 3. set up video (mpgv) codec
144 * 4. return VLC_SUCCESS
146 static int TyOpen(vlc_object_t *p_this)
148 demux_t *p_demux = (demux_t *)p_this;
150 vlc_bool_t b_seekable;
154 /* see if this stream is seekable */
155 stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_seekable );
157 /* peek at the first 12 bytes. */
158 /* for TY streams, they're always the same */
159 if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
162 if ( U32_AT(p_peek) != TIVO_PES_FILEID ||
163 U32_AT(&p_peek[4]) != 0x02 ||
164 U32_AT(&p_peek[8]) != CHUNK_SIZE )
166 /* doesn't look like a TY file... */
167 char *psz_ext = strrchr(p_demux->psz_path, '.');
168 /* if they specified tydemux, or if the file ends in .ty we try anyway */
169 if (strcmp(p_demux->psz_demux, "tydemux") && strcasecmp(psz_ext, ".ty"))
171 msg_Warn(p_demux, "this does not look like a TY file, 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;
190 p_sys->b_seekable = b_seekable;
192 /* TODO: read first chunk & parse first audio PTS, then (if seekable)
193 * seek to last chunk & last record; read its PTS and compute
194 * overall program time. Also determine Tivo type. */
196 /* NOTE: we wait to create the audio ES until we know what
197 * audio type we have. */
198 p_sys->p_audio = NULL;
200 /* register the video stream */
201 es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
202 p_sys->p_video = es_out_Add( p_demux->out, &fmt );
205 /* register the CC decoder */
206 es_format_Init( &fmt, SPU_ES, VLC_FOURCC('s', 'u', 'b', 't'));
207 p_sys->p_subt_es = es_out_Add(p_demux->out, &fmt);
214 /* set up audio codec.
215 * this will be called once we determine audio type */
216 static void setup_audio_streams(char stream_type, demux_t *p_demux)
218 demux_sys_t *p_sys = p_demux->p_sys;
221 if (stream_type == 'A') {
222 /* AC3 audio detected */
223 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'a', '5', '2', ' ' ) );
224 p_sys->tivoType = 2; /* AC3 is only on dtivo */
227 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', 'g', 'a' ) );
228 p_sys->b_mpeg_audio = VLC_TRUE;
230 /* register the chosen audio output codec */
231 p_sys->p_audio = es_out_Add( p_demux->out, &fmt );
235 /* =========================================================================== */
236 /* Compute Presentation Time Stamp (PTS)
237 * Assume buf points to beginning of PTS */
238 static mtime_t get_pts( unsigned char *buf )
242 i_pts = ((mtime_t)(buf[0]&0x0e ) << 29)|
243 (mtime_t)(buf[1] << 22)|
244 ((mtime_t)(buf[2]&0xfe) << 14)|
245 (mtime_t)(buf[3] << 7)|
246 (mtime_t)(buf[4] >> 1);
247 i_pts *= 100 / 9; /* convert PTS (90Khz clock) to microseconds */
252 /* =========================================================================== */
253 static int find_es_header( unsigned const char *header,
254 unsigned char *buffer, int bufferSize, int *esOffset1 )
259 for( count = 0 ; count < bufferSize ; count++ )
261 if ( ( buffer[ count + 0 ] == header[ 0 ] ) &&
262 ( buffer[ count + 1 ] == header[ 1 ] ) &&
263 ( buffer[ count + 2 ] == header[ 2 ] ) &&
264 ( buffer[ count + 3 ] == header[ 3 ] ) )
274 /* =========================================================================== */
275 /* check if we have a full PES header, if not, then save what we have.
276 * this is called when audio-start packets are encountered.
278 * 1 partial PES hdr found, some audio data found (buffer adjusted),
279 * -1 partial PES hdr found, no audio data found
280 * 0 otherwise (complete PES found, pts extracted, pts set, buffer adjusted) */
281 /* TODO: fix it so it works with S2 / SA / DTivo / HD etc... */
282 static int check_sync_pes( demux_t *p_demux, block_t *p_block,
283 int32_t offset, int32_t rec_len )
285 demux_sys_t *p_sys = p_demux->p_sys;
287 int pes_length = p_sys->b_mpeg_audio?SERIES1_PES_LENGTH:AC3_PES_LENGTH;
289 if( p_sys->tivoType == 1 )
292 pts_offset = SA_PTS_OFFSET;
297 pts_offset = p_sys->b_mpeg_audio?DTIVO_PTS_OFFSET:AC3_PTS_OFFSET;
299 if ( offset < 0 || offset + pes_length > rec_len )
301 /* entire PES header not present */
302 msg_Dbg( p_demux, "PES header at %d not complete in record. storing.",
304 /* save the partial pes header */
307 /* no header found, fake some 00's (this works, believe me) */
308 memset( p_sys->pes_buffer, 4, 0 );
309 p_sys->i_pes_buf_cnt = 4;
311 msg_Err( p_demux, "PES header not found in record of %d bytes!",
315 /* copy the partial pes header we found */
316 memcpy( p_sys->pes_buffer, p_block->p_buffer + offset,
318 p_sys->i_pes_buf_cnt = rec_len - offset;
322 /* PES Header was found, but not complete, so trim the end of this record */
323 p_block->i_buffer -= rec_len - offset;
326 return -1; /* partial PES, no audio data */
328 /* full PES header present, extract PTS */
329 p_sys->lastAudioPTS = get_pts( &p_block->p_buffer[ offset + pts_offset ] );
330 if (p_sys->firstAudioPTS < 0)
331 p_sys->firstAudioPTS = p_sys->lastAudioPTS;
332 p_block->i_pts = p_sys->lastAudioPTS;
333 /*msg_Dbg(p_demux, "Audio PTS %lld", p_sys->lastAudioPTS );*/
334 /* adjust audio record to remove PES header */
335 memmove(p_block->p_buffer + offset, p_block->p_buffer + offset + pes_length,
336 rec_len - pes_length);
337 p_block->i_buffer -= pes_length;
342 /* =========================================================================== */
343 /* TyDemux: Read & Demux one record from the chunk
345 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
347 * NOTE: I think we can return the number of packets sent instead of just 1.
348 * that means we can demux an entire chunk and shoot it back (may be more efficient)
349 * -- should try that some day :) --
351 int TyDemux(demux_t *p_demux)
354 int recordsDecoded = 0;
360 ty_rec_hdr_t *rec_hdr;
362 block_t *p_block_in = NULL;
365 unsigned char lastCC[ 16 ];
366 unsigned char lastXDS[ 16 ];
368 demux_sys_t *p_sys = p_demux->p_sys;
370 /*msg_Dbg(p_demux, "ty demux processing" );*/
372 /* did we hit EOF earlier? */
373 if (p_sys->eof) return 0;
376 * what we do (1 record now.. maybe more later):
377 * - use stream_Read() to read the chunk header & record headers
378 * - discard entire chunk if it is a PART header chunk
379 * - parse all the headers into record header array
380 * - keep a pointer of which record we're on
381 * - use stream_Block() to fetch each record
382 * - parse out PTS from PES headers
383 * - set PTS for data packets
384 * - pass the data on to the proper codec via es_out_Send()
386 * if this is the first time or
387 * if we're at the end of this chunk, start a new one
389 /* parse the next chunk's record headers */
390 if (p_sys->b_first_chunk || p_sys->i_cur_rec >= p_sys->i_num_recs)
391 if (get_chunk_header(p_demux) == 0)
394 /*======================================================================
395 * parse & send one record of the chunk
396 *====================================================================== */
397 i_cur_rec = p_sys->i_cur_rec;
399 rec_hdr = &p_sys->rec_hdrs[ i_cur_rec ];
400 subrec_type = rec_hdr->subrec_type;
401 rec_type = rec_hdr->rec_type;
402 l_rec_size = rec_hdr->l_rec_size;
406 /*msg_Dbg(p_demux, "Record Type 0x%x/%02x %ld bytes",
407 subrec_type, rec_type, l_rec_size );*/
409 /* some normal records are 0 length, so check for that... */
412 /* read in this record's payload */
413 if( !( p_block_in = stream_Block( p_demux->s, l_rec_size ) ) )
419 /* set these as 'unknown' for now */
420 p_block_in->i_pts = p_block_in->i_dts = 0;
424 /* no data in payload; we're done */
431 -- don't read any data from the stream, data was in the record header --
433 "Record Type 0x%02x/%02x, ext data = %02x, %02x", subrec_type,
434 rec_type, rec_hdr->ex1, rec_hdr->ex2);
437 /*================================================================*
439 *================================================================*/
440 if ( rec_type == 0xe0 )
442 if( subrec_type == 0x06 )
444 /* get the PTS from this packet.
445 * Do NOT Pass this packet (a PES Header) on to the MPEG2 codec */
446 find_es_header( ty_VideoPacket, p_block_in->p_buffer,
447 l_rec_size, &esOffset1 );
448 if ( esOffset1 != -1 )
450 /* msg_Dbg(p_demux, "Video PES hdr at offset %d", esOffset1); */
451 p_sys->lastVideoPTS = get_pts( &p_block_in->p_buffer[ esOffset1 + 9 ] );
452 /*msg_Dbg(p_demux, "Video rec %d PTS "I64Fd, p_sys->i_cur_rec,
453 p_sys->lastVideoPTS );*/
455 block_Release(p_block_in);
460 msg_Dbg(p_demux, "packet buffer has "
461 "%02x %02x %02x %02x %02x %02x %02x %02x "
462 "%02x %02x %02x %02x %02x %02x %02x %02x",
463 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
464 p_block_in->p_buffer[2], p_block_in->p_buffer[3],
465 p_block_in->p_buffer[4], p_block_in->p_buffer[5],
466 p_block_in->p_buffer[6], p_block_in->p_buffer[7],
467 p_block_in->p_buffer[8], p_block_in->p_buffer[9],
468 p_block_in->p_buffer[10], p_block_in->p_buffer[11],
469 p_block_in->p_buffer[12], p_block_in->p_buffer[13],
470 p_block_in->p_buffer[14], p_block_in->p_buffer[15]);
472 /* if it's not a continue blk, then set PTS */
473 if (subrec_type != 0x02)
475 /*msg_Dbg(p_demux, "Video rec %d type 0x%02X", p_sys->i_cur_rec,
477 /* if it's a GOP header, make sure it's legal
478 * (if we have enough data) */
479 /* Some ty files don't have this bit set
480 * and it causes problems */
481 if (subrec_type == 0x0c && l_rec_size >= 6)
482 p_block_in->p_buffer[5] |= 0x08;
483 /* set PTS for this block before we send */
484 if (p_sys->lastVideoPTS > 0)
486 p_block_in->i_pts = p_sys->lastVideoPTS;
487 /* PTS gets used ONCE.
488 * Any subsequent frames we get BEFORE next PES
489 * header will have their PTS computed in the codec */
490 p_sys->lastVideoPTS = 0;
493 es_out_Send(p_demux->out, p_sys->p_video, p_block_in);
495 } /* end if video rec type */
496 /* ================================================================
498 * ================================================================
499 * parse PES headers and send the rest to the codec
501 else if ( rec_type == 0xc0 )
505 printf( "Audio Packet Header " );
506 for( i = 0 ; i < 24 ; i++ )
507 printf( "%2.2x ", p_block_in->p_buffer[i] );
510 /* load a codec if we haven't yet */
511 if ( p_sys->p_audio == NULL )
513 if ( subrec_type == 0x09 )
515 /* set up for AC-3 audio */
516 msg_Dbg(p_demux, "detected AC-3 Audio" );
517 setup_audio_streams('A', p_demux);
521 /* set up for MPEG audio */
522 msg_Dbg(p_demux, "detected MPEG Audio" );
523 setup_audio_streams('M', p_demux);
527 /* SA or DTiVo Audio Data, no PES (continued block)
528 * ================================================
530 if ( subrec_type == 2 )
532 /* continue PES if previous was incomplete */
533 /* TODO: Make this work for all series & types of tivos */
534 if (p_sys->i_pes_buf_cnt > 0)
536 int i_need = SERIES1_PES_LENGTH - p_sys->i_pes_buf_cnt;
538 msg_Dbg(p_demux, "continuing PES header");
539 /* do we have enough data to complete? */
540 if (i_need < l_rec_size)
542 /* we have enough; reconstruct this p_frame with the new hdr */
543 memcpy(&p_sys->pes_buffer[p_sys->i_pes_buf_cnt],
544 p_block_in->p_buffer, i_need);
545 /* advance the block past the PES header (don't want to send it) */
546 p_block_in->p_buffer += i_need;
547 p_block_in->i_buffer -= i_need;
548 /* get the PTS out of this PES header (MPEG or AC3) */
549 if (p_sys->b_mpeg_audio)
550 find_es_header(ty_MPEGAudioPacket, p_sys->pes_buffer,
553 find_es_header(ty_AC3AudioPacket, p_sys->pes_buffer,
557 /* god help us; something's really wrong */
558 msg_Err(p_demux, "can't find audio PES header in packet");
562 p_sys->lastAudioPTS = get_pts(
563 &p_sys->pes_buffer[ esOffset1 + DTIVO_PTS_OFFSET ] );
564 p_block_in->i_pts = p_sys->lastAudioPTS;
566 p_sys->i_pes_buf_cnt = 0;
570 /* don't have complete PES hdr; save what we have and return */
571 memcpy(&p_sys->pes_buffer[p_sys->i_pes_buf_cnt],
572 p_block_in->p_buffer, l_rec_size);
573 p_sys->i_pes_buf_cnt += l_rec_size;
575 block_Release(p_block_in);
579 /* set PCR before we send */
580 /*es_out_Control( p_demux->out, ES_OUT_SET_PCR,
581 p_block_in->i_pts );*/
582 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
585 /* MPEG Audio with PES Header, either SA or DTiVo */
586 /* ================================================ */
587 if ( subrec_type == 0x03 )
589 find_es_header( ty_MPEGAudioPacket, p_block_in->p_buffer,
590 l_rec_size, &esOffset1 );
592 /*msg_Dbg(p_demux, "buffer has %#02x %#02x %#02x %#02x",
593 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
594 p_block_in->p_buffer[2], p_block_in->p_buffer[3]);
595 msg_Dbg(p_demux, "audio ES hdr at offset %d", esOffset1);*/
597 /* SA PES Header, No Audio Data */
598 /* ================================================ */
599 if ( ( esOffset1 == 0 ) && ( l_rec_size == 16 ) )
602 p_sys->lastAudioPTS = get_pts( &p_block_in->p_buffer[
604 if (p_sys->firstAudioPTS < 0)
605 p_sys->firstAudioPTS = p_sys->lastAudioPTS;
606 block_Release(p_block_in);
607 /*msg_Dbg(p_demux, "SA Audio PTS %lld",
608 p_sys->lastAudioPTS );*/
611 /* DTiVo Audio with PES Header */
612 /* ================================================ */
616 /* Check for complete PES
617 * (TODO: handle proper size for tivo version) */
618 if (check_sync_pes(p_demux, p_block_in, esOffset1,
621 /* partial PES header found, nothing else.
624 block_Release(p_block_in);
628 msg_Dbg(p_demux, "packet buffer has "
629 "%02x %02x %02x %02x %02x %02x %02x %02x "
630 "%02x %02x %02x %02x %02x %02x %02x %02x",
631 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
632 p_block_in->p_buffer[2], p_block_in->p_buffer[3],
633 p_block_in->p_buffer[4], p_block_in->p_buffer[5],
634 p_block_in->p_buffer[6], p_block_in->p_buffer[7],
635 p_block_in->p_buffer[8], p_block_in->p_buffer[9],
636 p_block_in->p_buffer[10], p_block_in->p_buffer[11],
637 p_block_in->p_buffer[12], p_block_in->p_buffer[13],
638 p_block_in->p_buffer[14], p_block_in->p_buffer[15]);
640 /* set PCR before we send */
641 if( p_block_in->i_pts > 0 )
642 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
644 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
646 } /* if subrec == 0x03 */
648 /* SA Audio with no PES Header */
649 /* ================================================ */
650 if ( subrec_type == 0x04 )
653 "Adding SA Audio Packet Size %ld", l_rec_size ); */
655 /* set PCR before we send */
656 if (p_sys->lastAudioPTS > 0)
658 p_block_in->i_pts = p_sys->lastAudioPTS;
659 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
662 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
665 /* DTiVo AC3 Audio Data with PES Header */
666 /* ================================================ */
667 if ( subrec_type == 0x09 )
669 find_es_header( ty_AC3AudioPacket, p_block_in->p_buffer,
670 l_rec_size, &esOffset1 );
672 /*msg_Dbg(p_demux, "buffer has %#02x %#02x %#02x %#02x",
673 p_block_in->p_buffer[0], p_block_in->p_buffer[1],
674 p_block_in->p_buffer[2], p_block_in->p_buffer[3]);
675 msg_Dbg(p_demux, "audio ES AC3 hdr at offset %d", esOffset1);*/
677 /* Check for complete PES */
678 if (check_sync_pes(p_demux, p_block_in, esOffset1,
681 /* partial PES header found, nothing else. we're done. */
685 /* set PCR before we send (if PTS found) */
686 if( p_block_in->i_pts > 0 )
688 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
691 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
693 } /* end "if audio" */
694 /* ================================================================ */
696 /* ================================================================ */
697 else if ( rec_type == 0x01 )
699 /*msg_Dbg(p_demux, "CC1 %02x %02x [%c%c]", rec_hdr->ex1,
700 rec_hdr->ex2, rec_hdr->ex1, rec_hdr->ex2 );*/
702 /* construct a 'user-data' MPEG packet */
703 lastCC[ 0x00 ] = 0x00;
704 lastCC[ 0x01 ] = 0x00;
705 lastCC[ 0x02 ] = 0x01;
706 lastCC[ 0x03 ] = 0xb2;
707 lastCC[ 0x04 ] = 'T'; /* vcdimager code says this byte should be 0x11 */
708 lastCC[ 0x05 ] = 'Y'; /* (no other notes there) */
709 lastCC[ 0x06 ] = 0x01;
710 lastCC[ 0x07 ] = rec_hdr->ex1;
711 lastCC[ 0x08 ] = rec_hdr->ex2;
712 /* not sure what to send, because VLC doesn't yet support
713 * teletext type of subtitles (only supports the full-sentence type) */
714 /*p_block_in = block_NewEmpty(); ????
715 es_out_Send( p_demux->out, p_sys->p_subt_es, p_block_in );*/
717 else if ( rec_type == 0x02 )
719 /*msg_Dbg(p_demux, "CC2 %02x %02x", rec_hdr->ex1, rec_hdr->ex2 );*/
721 /* construct a 'user-data' MPEG packet */
722 lastXDS[ 0x00 ] = 0x00;
723 lastXDS[ 0x01 ] = 0x00;
724 lastXDS[ 0x02 ] = 0x01;
725 lastXDS[ 0x03 ] = 0xb2;
726 lastXDS[ 0x04 ] = 'T'; /* vcdimager code says this byte should be 0x11 */
727 lastXDS[ 0x05 ] = 'Y'; /* (no other notes there) */
728 lastXDS[ 0x06 ] = 0x02;
729 lastXDS[ 0x07 ] = rec_hdr->ex1;
730 lastXDS[ 0x08 ] = rec_hdr->ex2;
731 /* not sure what to send, because VLC doesn't support this?? */
732 /*p_block_in = block_NewEmpty(); ????
733 es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );*/
735 /* ================================================================ */
736 /* Tivo data services (e.g. "thumbs-up to record!") useless for us */
737 /* ================================================================ */
738 else if ( rec_type == 0x03 )
741 /* ================================================================ */
742 /* Unknown, but seen regularly */
743 /* ================================================================ */
744 else if ( rec_type == 0x05 )
749 msg_Dbg(p_demux, "Invalid record type 0x%02x", rec_type );
750 if (p_block_in) block_Release(p_block_in);
758 /* seek to a position within the stream, if possible */
759 static int ty_stream_seek(demux_t *p_demux, double seek_pct)
761 demux_sys_t *p_sys = p_demux->p_sys;
762 int64_t seek_pos = p_sys->i_stream_size * seek_pct;
766 /* if we're not seekable, there's nothing to do */
767 if (!p_sys->b_seekable)
770 /* figure out which chunk we want & go there */
771 p_sys->i_chunk_count = seek_pos / CHUNK_SIZE;
773 if ( stream_Seek( p_demux->s, p_sys->i_chunk_count * CHUNK_SIZE))
775 /* can't seek stream */
779 get_chunk_header(p_demux);
781 /* seek within the chunk to get roughly to where we want */
782 p_sys->i_cur_rec = (int)
783 ((double) ((seek_pos % CHUNK_SIZE) / (double) (CHUNK_SIZE)) * p_sys->i_num_recs);
784 msg_Dbg(p_demux, "Seeked to file pos " I64Fd, seek_pos);
785 msg_Dbg(p_demux, " (chunk %d, record %d)",
786 p_sys->i_chunk_count - 1, p_sys->i_cur_rec);
788 /* seek to the start of this record's data.
789 * to do that, we have to skip past all prior records */
791 for (i=0; i<p_sys->i_cur_rec; i++)
792 l_skip_amt += p_sys->rec_hdrs[i].l_rec_size;
793 stream_Seek(p_demux->s, ((p_sys->i_chunk_count-1) * CHUNK_SIZE) +
794 (p_sys->i_num_recs * 16) + l_skip_amt + 4);
796 /* to hell with syncing any audio or video, just start reading records... :) */
797 /*p_sys->lastAudioPTS = p_sys->lastVideoPTS = 0;*/
798 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
803 static int Control(demux_t *p_demux, int i_query, va_list args)
805 demux_sys_t *p_sys = p_demux->p_sys;
809 /*msg_Info(p_demux, "control cmd %d", i_query);*/
812 case DEMUX_GET_POSITION:
813 /* arg is 0.0 - 1.0 percent of overall file position */
814 if( ( i64 = p_sys->i_stream_size ) > 0 )
816 pf = (double*) va_arg( args, double* );
817 *pf = (double)stream_Tell( p_demux->s ) / (double) i64;
822 case DEMUX_SET_POSITION:
823 /* arg is 0.0 - 1.0 percent of overall file position */
824 f = (double) va_arg( args, double );
825 //msg_Dbg(p_demux, "Control - set position to %2.3f", f);
826 if ((i64 = p_sys->i_stream_size) > 0)
827 return ty_stream_seek(p_demux, f);
830 /* return latest PTS - start PTS */
831 p_i64 = (int64_t *) va_arg(args, int64_t *);
832 *p_i64 = p_sys->lastAudioPTS - p_sys->firstAudioPTS;
834 case DEMUX_SET_TIME: /* arg is time in microsecs */
835 case DEMUX_GET_LENGTH: /* length of program in microseconds, 0 if unk */
843 /* =========================================================================== */
844 static void TyClose( vlc_object_t *p_this )
846 demux_sys_t *p_sys = ((demux_t *) p_this)->p_sys;
848 free(p_sys->rec_hdrs);
853 /* =========================================================================== */
854 static int get_chunk_header(demux_t *p_demux)
856 int i_readSize, i_num_recs, i;
857 uint8_t packet_header[4];
858 uint8_t record_header[16];
859 ty_rec_hdr_t *p_rec_hdr;
860 demux_sys_t *p_sys = p_demux->p_sys;
861 int i_payload_size = 0; /* sum of all records */
863 msg_Dbg(p_demux, "parsing ty chunk #%d", p_sys->i_chunk_count );
865 /* if we have left-over filler space from the last chunk, get that */
866 if (p_sys->i_stuff_cnt > 0)
867 stream_Read( p_demux->s, NULL, p_sys->i_stuff_cnt);
869 /* read the TY packet header */
870 i_readSize = stream_Read( p_demux->s, packet_header, 4 );
871 p_sys->i_chunk_count++;
873 if ( i_readSize < 4 )
880 /* if it's a PART Header, then try again. */
881 if( U32_AT( &packet_header[ 0 ] ) == TIVO_PES_FILEID )
883 msg_Dbg( p_demux, "skipping TY PART Header" );
884 /* TODO: if stream is seekable, should we seek() instead of read() ?? */
885 stream_Read( p_demux->s, NULL, CHUNK_SIZE - 4 );
886 return get_chunk_header(p_demux);
889 /* number of records in chunk (8- or 16-bit number) */
890 if (packet_header[3] & 0x80)
893 p_sys->i_num_recs = i_num_recs = (packet_header[1] << 8) + packet_header[0];
894 p_sys->i_seq_rec = (packet_header[3] << 8) + packet_header[2];
895 if (p_sys->i_seq_rec != 0xffff)
897 p_sys->i_seq_rec &= ~0x8000;
902 /* 8 bit reclen - tivo 1.3 format */
903 p_sys->i_num_recs = i_num_recs = packet_header[0];
904 p_sys->i_seq_rec = packet_header[1];
906 p_sys->i_cur_rec = 0;
907 p_sys->b_first_chunk = VLC_FALSE;
909 /*msg_Dbg( p_demux, "chunk has %d records", i_num_recs );*/
911 /* parse headers into array */
913 free(p_sys->rec_hdrs);
914 p_sys->rec_hdrs = malloc(i_num_recs * sizeof(ty_rec_hdr_t));
915 for (i = 0; i < i_num_recs; i++)
917 i_readSize = stream_Read( p_demux->s, record_header, 16 );
921 p_sys->eof = VLC_TRUE;
924 p_rec_hdr = &p_sys->rec_hdrs[i]; /* for brevity */
925 p_rec_hdr->rec_type = record_header[3];
926 p_rec_hdr->subrec_type = record_header[2] & 0x0f;
927 if ((record_header[ 0 ] & 0x80) == 0x80)
929 unsigned char b1, b2;
930 /* marker bit 2 set, so read extended data */
931 b1 = ( ( ( record_header[ 0 ] & 0x0f ) << 4 ) |
932 ( ( record_header[ 1 ] & 0xf0 ) >> 4 ) );
934 b2 = ( ( ( record_header[ 1 ] & 0x0f ) << 4 ) |
935 ( ( record_header[ 2 ] & 0xf0 ) >> 4 ) );
940 p_rec_hdr->l_rec_size = 0;
941 p_rec_hdr->b_ext = VLC_TRUE;
945 p_rec_hdr->l_rec_size = ( record_header[ 0 ] << 8 |
946 record_header[ 1 ] ) << 4 | ( record_header[ 2 ] >> 4 );
947 i_payload_size += p_rec_hdr->l_rec_size;
948 p_rec_hdr->b_ext = VLC_FALSE;
950 } /* end of record-header loop */
951 p_sys->i_stuff_cnt = CHUNK_SIZE - 4 -
952 (p_sys->i_num_recs * 16) - i_payload_size;
953 if (p_sys->i_stuff_cnt > 0)
954 msg_Dbg( p_demux, "chunk has %d stuff bytes at end",
955 p_sys->i_stuff_cnt );