ty.c
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上传日期:2020-07-06
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midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * ty.c - TiVo ty stream video demuxer for VLC
- *****************************************************************************
- * Copyright (C) 2005 the VideoLAN team
- * Copyright (C) 2005 by Neal Symms (tivo@freakinzoo.com) - February 2005
- * based on code by Christopher Wingert for tivo-mplayer
- * tivo(at)wingert.org, February 2003
- *
- * $Id: 8ead0bf3fa4aab9ab568edc54086657f4cc4bc44 $
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *
- * CODE CHANGES:
- * v1.0.0 - 24-Feb-2005 - Initial release - Series 1 support ONLY!
- * v1.0.1 - 25-Feb-2005 - Added fix for bad GOP headers - Neal
- * v1.0.2 - 26-Feb-2005 - No longer require "seekable" input stream - Neal
- * v2.0.0 - 21-Mar-2005 - Series 2 support! No AC-3 on S2 DTivo yet.
- * v2.1.0 - 22-Mar-2005 - Support for AC-3 on S2 DTivo (long ac3 packets)
- * v3.0.0 - 14-Jul-2005 - Support for skipping fwd/back via VLC hotkeys
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_plugin.h>
- #include <vlc_demux.h>
- #include "vlc_codec.h"
- #include "vlc_meta.h"
- #include "vlc_input.h"
- #include "../codec/cc.h"
- #include <assert.h>
- /*****************************************************************************
- * Module descriptor
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close( vlc_object_t * );
- vlc_module_begin ()
- set_shortname( N_("TY") )
- set_description(N_("TY Stream audio/video demux"))
- set_category( CAT_INPUT )
- set_subcategory( SUBCAT_INPUT_DEMUX )
- set_capability("demux", 6)
- /* FIXME: there seems to be a segfault when using PVR access
- * and TY demux has a bigger priority than PS
- * Something must be wrong.
- */
- set_callbacks( Open, Close )
- add_shortcut("ty")
- add_shortcut("tivo")
- vlc_module_end ()
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static int Demux ( demux_t * );
- static int Control( demux_t *, int, va_list );
- #define SERIES1_PES_LENGTH (11) /* length of audio PES hdr on S1 */
- #define SERIES2_PES_LENGTH (16) /* length of audio PES hdr on S2 */
- #define AC3_PES_LENGTH (14) /* length of audio PES hdr for AC3 */
- #define VIDEO_PES_LENGTH (16) /* length of video PES header */
- #define DTIVO_PTS_OFFSET (6) /* offs into PES for MPEG PTS on DTivo */
- #define SA_PTS_OFFSET (9) /* offset into PES for MPEG PTS on SA */
- #define AC3_PTS_OFFSET (9) /* offset into PES for AC3 PTS on DTivo */
- #define VIDEO_PTS_OFFSET (9) /* offset into PES for video PTS on all */
- #define AC3_PKT_LENGTH (1536) /* size of TiVo AC3 pkts (w/o PES hdr) */
- static const uint8_t ty_VideoPacket[] = { 0x00, 0x00, 0x01, 0xe0 };
- static const uint8_t ty_MPEGAudioPacket[] = { 0x00, 0x00, 0x01, 0xc0 };
- static const uint8_t ty_AC3AudioPacket[] = { 0x00, 0x00, 0x01, 0xbd };
- #define CHUNK_PEEK_COUNT (3) /* number of chunks to probe */
- /* packet types for reference:
- 2/c0: audio data continued
- 3/c0: audio packet header (PES header)
- 4/c0: audio data (S/A only?)
- 9/c0: audio packet header, AC-3 audio
- 2/e0: video data continued
- 6/e0: video packet header (PES header)
- 7/e0: video sequence header start
- 8/e0: video I-frame header start
- a/e0: video P-frame header start
- b/e0: video B-frame header start
- c/e0: video GOP header start
- e/01: closed-caption data
- e/02: Extended data services data
- e/03: ipreview data ("thumbs up to record" signal)
- e/05: UK Teletext
- */
- #define TIVO_PES_FILEID ( 0xf5467abd )
- #define TIVO_PART_LENGTH ( 0x20000000 ) /* 536,870,912 bytes */
- #define CHUNK_SIZE ( 128 * 1024 )
- typedef struct
- {
- long l_rec_size;
- uint8_t ex[2];
- uint8_t rec_type;
- uint8_t subrec_type;
- bool b_ext;
- uint64_t l_ty_pts; /* TY PTS in the record header */
- } ty_rec_hdr_t;
- typedef struct
- {
- uint64_t l_timestamp;
- uint8_t chunk_bitmask[8];
- } ty_seq_table_t;
- typedef enum
- {
- TIVO_TYPE_UNKNOWN,
- TIVO_TYPE_SA,
- TIVO_TYPE_DTIVO
- } tivo_type_t;
- typedef enum
- {
- TIVO_SERIES_UNKNOWN,
- TIVO_SERIES1,
- TIVO_SERIES2
- } tivo_series_t;
- typedef enum
- {
- TIVO_AUDIO_UNKNOWN,
- TIVO_AUDIO_AC3,
- TIVO_AUDIO_MPEG
- } tivo_audio_t;
- #define XDS_MAX_DATA_SIZE (32)
- typedef enum
- {
- XDS_CLASS_CURRENT = 0,
- XDS_CLASS_FUTURE = 1,
- XDS_CLASS_CHANNEL = 2,
- XDS_CLASS_MISCELLANEOUS = 3,
- XDS_CLASS_PUBLIC_SERVICE = 4,
- XDS_CLASS_RESERVED = 5,
- XDS_CLASS_UNDEFINED = 6,
- XDS_CLASS_OTHER = 7,
- XDS_MAX_CLASS_COUNT
- } xds_class_t;
- typedef struct
- {
- bool b_started;
- int i_data;
- uint8_t p_data[XDS_MAX_DATA_SIZE];
- int i_sum;
- } xds_packet_t;
- typedef enum
- {
- XDS_META_PROGRAM_RATING_NONE,
- XDS_META_PROGRAM_RATING_MPAA,
- XDS_META_PROGRAM_RATING_TPG,
- /* TODO add CA/CE rating */
- } xds_meta_program_rating_t;
- typedef struct
- {
- char *psz_name;
- xds_meta_program_rating_t rating;
- char *psz_rating;
- /* Add the other fields once I have the samples */
- } xds_meta_program_t;
- typedef struct
- {
- char *psz_channel_name;
- char *psz_channel_call_letter;
- char *psz_channel_number;
- xds_meta_program_t current;
- xds_meta_program_t future;
- } xds_meta_t;
- typedef struct
- {
- /* Are we in XDS mode */
- bool b_xds;
- /* Current class type */
- xds_class_t i_class;
- int i_type;
- bool b_future;
- /* */
- xds_packet_t pkt[XDS_MAX_CLASS_COUNT][128]; /* XXX it is way too much, but simpler */
- /* */
- bool b_meta_changed;
- xds_meta_t meta;
- } xds_t;
- struct demux_sys_t
- {
- es_out_id_t *p_video; /* ptr to video codec */
- es_out_id_t *p_audio; /* holds either ac3 or mpeg codec ptr */
- cc_data_t cc;
- es_out_id_t *p_cc[4];
- xds_t xds;
- int i_cur_chunk;
- int i_stuff_cnt;
- size_t i_stream_size; /* size of input stream (if known) */
- //uint64_t l_program_len; /* length of this stream in msec */
- bool b_seekable; /* is this stream seekable? */
- bool b_have_master; /* are master chunks present? */
- tivo_type_t tivo_type; /* tivo type (SA / DTiVo) */
- tivo_series_t tivo_series; /* Series1 or Series2 */
- tivo_audio_t audio_type; /* AC3 or MPEG */
- int i_Pes_Length; /* Length of Audio PES header */
- int i_Pts_Offset; /* offset into audio PES of PTS */
- uint8_t pes_buffer[20]; /* holds incomplete pes headers */
- int i_pes_buf_cnt; /* how many bytes in our buffer */
- size_t l_ac3_pkt_size; /* len of ac3 pkt we've seen so far */
- uint64_t l_last_ty_pts; /* last TY timestamp we've seen */
- //mtime_t l_last_ty_pts_sync; /* audio PTS at time of last TY PTS */
- uint64_t l_first_ty_pts; /* first TY PTS in this master chunk */
- uint64_t l_final_ty_pts; /* final TY PTS in this master chunk */
- unsigned i_seq_table_size; /* number of entries in SEQ table */
- unsigned i_bits_per_seq_entry; /* # of bits in SEQ table bitmask */
- mtime_t firstAudioPTS;
- mtime_t lastAudioPTS;
- mtime_t lastVideoPTS;
- ty_rec_hdr_t *rec_hdrs; /* record headers array */
- int i_cur_rec; /* current record in this chunk */
- int i_num_recs; /* number of recs in this chunk */
- int i_seq_rec; /* record number where seq start is */
- ty_seq_table_t *seq_table; /* table of SEQ entries from mstr chk */
- bool eof;
- bool b_first_chunk;
- };
- static int get_chunk_header(demux_t *);
- static mtime_t get_pts( const uint8_t *buf );
- static int find_es_header( const uint8_t *header,
- const uint8_t *buffer, int i_search_len );
- static int ty_stream_seek_pct(demux_t *p_demux, double seek_pct);
- static int ty_stream_seek_time(demux_t *, uint64_t);
- static ty_rec_hdr_t *parse_chunk_headers( const uint8_t *p_buf,
- int i_num_recs, int *pi_payload_size);
- static int probe_stream(demux_t *p_demux);
- static void analyze_chunk(demux_t *p_demux, const uint8_t *p_chunk);
- static void parse_master(demux_t *p_demux);
- static int DemuxRecVideo( demux_t *p_demux, ty_rec_hdr_t *rec_hdr, block_t *p_block_in );
- static int DemuxRecAudio( demux_t *p_demux, ty_rec_hdr_t *rec_hdr, block_t *p_block_in );
- static int DemuxRecCc( demux_t *p_demux, ty_rec_hdr_t *rec_hdr, block_t *p_block_in );
- static void DemuxDecodeXds( demux_t *p_demux, uint8_t d1, uint8_t d2 );
- static void XdsInit( xds_t * );
- static void XdsExit( xds_t * );
- #define TY_ES_GROUP (1)
- /*
- * Open: check file and initialize demux structures
- *
- * here's what we do:
- * 1. peek at the first 12 bytes of the stream for the
- * magic TiVo PART header & stream type & chunk size
- * 2. if it's not there, error with VLC_EGENERIC
- * 3. set up video (mpgv) codec
- * 4. return VLC_SUCCESS
- */
- static int Open(vlc_object_t *p_this)
- {
- demux_t *p_demux = (demux_t *)p_this;
- demux_sys_t *p_sys;
- es_format_t fmt;
- const uint8_t *p_peek;
- int i;
- /* peek at the first 12 bytes. */
- /* for TY streams, they're always the same */
- if( stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
- return VLC_EGENERIC;
- if ( U32_AT(p_peek) != TIVO_PES_FILEID ||
- U32_AT(&p_peek[4]) != 0x02 ||
- U32_AT(&p_peek[8]) != CHUNK_SIZE )
- {
- if( !p_demux->b_force &&
- !demux_IsPathExtension( p_demux, ".ty" ) &&
- !demux_IsPathExtension( p_demux, ".ty+" ) )
- return VLC_EGENERIC;
- msg_Warn( p_demux, "this does not look like a TY file, "
- "continuing anyway..." );
- }
- /* at this point, we assume we have a valid TY stream */
- msg_Dbg( p_demux, "valid TY stream detected" );
- /* Set exported functions */
- p_demux->pf_demux = Demux;
- p_demux->pf_control = Control;
- /* create our structure that will hold all data */
- p_demux->p_sys = p_sys = malloc(sizeof(demux_sys_t));
- memset(p_sys, 0, sizeof(demux_sys_t));
- /* set up our struct (most were zero'd out with the memset above) */
- p_sys->b_first_chunk = true;
- p_sys->b_have_master = (U32_AT(p_peek) == TIVO_PES_FILEID);
- p_sys->firstAudioPTS = -1;
- p_sys->i_stream_size = stream_Size(p_demux->s);
- p_sys->tivo_type = TIVO_TYPE_UNKNOWN;
- p_sys->audio_type = TIVO_AUDIO_UNKNOWN;
- p_sys->tivo_series = TIVO_SERIES_UNKNOWN;
- p_sys->i_Pes_Length = 0;
- p_sys->i_Pts_Offset = 0;
- p_sys->l_ac3_pkt_size = 0;
- /* see if this stream is seekable */
- stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
- if (probe_stream(p_demux) != VLC_SUCCESS) {
- //TyClose(p_demux);
- return VLC_EGENERIC;
- }
- if (!p_sys->b_have_master)
- msg_Warn(p_demux, "No master chunk found; seeking will be limited.");
- /* register the proper audio codec */
- if (p_sys->audio_type == TIVO_AUDIO_MPEG) {
- es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', 'g', 'a' ) );
- } else {
- es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'a', '5', '2', ' ' ) );
- }
- fmt.i_group = TY_ES_GROUP;
- p_sys->p_audio = es_out_Add( p_demux->out, &fmt );
- /* register the video stream */
- es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
- fmt.i_group = TY_ES_GROUP;
- p_sys->p_video = es_out_Add( p_demux->out, &fmt );
- /* */
- for( i = 0; i < 4; i++ )
- p_sys->p_cc[i] = NULL;
- cc_Init( &p_sys->cc );
- XdsInit( &p_sys->xds );
- return VLC_SUCCESS;
- }
- /* =========================================================================== */
- /* Demux: Read & Demux one record from the chunk
- *
- * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
- *
- * NOTE: I think we can return the number of packets sent instead of just 1.
- * that means we can demux an entire chunk and shoot it back (may be more efficient)
- * -- should try that some day :) --
- */
- static int Demux( demux_t *p_demux )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- ty_rec_hdr_t *p_rec;
- block_t *p_block_in = NULL;
- /*msg_Dbg(p_demux, "ty demux processing" );*/
- /* did we hit EOF earlier? */
- if( p_sys->eof )
- return 0;
- /*
- * what we do (1 record now.. maybe more later):
- * - use stream_Read() to read the chunk header & record headers
- * - discard entire chunk if it is a PART header chunk
- * - parse all the headers into record header array
- * - keep a pointer of which record we're on
- * - use stream_Block() to fetch each record
- * - parse out PTS from PES headers
- * - set PTS for data packets
- * - pass the data on to the proper codec via es_out_Send()
- * if this is the first time or
- * if we're at the end of this chunk, start a new one
- */
- /* parse the next chunk's record headers */
- if( p_sys->b_first_chunk || p_sys->i_cur_rec >= p_sys->i_num_recs )
- {
- if( get_chunk_header(p_demux) == 0 )
- return 0;
- }
- /*======================================================================
- * parse & send one record of the chunk
- *====================================================================== */
- p_rec = &p_sys->rec_hdrs[p_sys->i_cur_rec];
- if( !p_rec->b_ext )
- {
- const long l_rec_size = p_rec->l_rec_size;
- /*msg_Dbg(p_demux, "Record Type 0x%x/%02x %ld bytes",
- subrec_type, p_rec->rec_type, l_rec_size );*/
- /* some normal records are 0 length, so check for that... */
- if( l_rec_size <= 0 )
- {
- /* no data in payload; we're done */
- p_sys->i_cur_rec++;
- return 1;
- }
- /* read in this record's payload */
- if( !( p_block_in = stream_Block( p_demux->s, l_rec_size ) ) )
- return 0;
- /* set these as 'unknown' for now */
- p_block_in->i_pts =
- p_block_in->i_dts = 0;
- }
- /*else
- {
- -- don't read any data from the stream, data was in the record header --
- msg_Dbg(p_demux,
- "Record Type 0x%02x/%02x, ext data = %02x, %02x", subrec_type,
- p_rec->rec_type, p_rec->ex1, p_rec->ex2);
- }*/
- if( p_rec->rec_type == 0xe0 )
- {
- /* Video */
- DemuxRecVideo( p_demux, p_rec, p_block_in );
- }
- else if ( p_rec->rec_type == 0xc0 )
- {
- /* Audio */
- DemuxRecAudio( p_demux, p_rec, p_block_in );
- }
- else if( p_rec->rec_type == 0x01 || p_rec->rec_type == 0x02 )
- {
- /* Closed Captions/XDS */
- DemuxRecCc( p_demux, p_rec, p_block_in );
- }
- else if ( p_rec->rec_type == 0x03 )
- {
- /* Tivo data services (e.g. "thumbs-up to record!") useless for us */
- if( p_block_in )
- block_Release(p_block_in);
- }
- else if ( p_rec->rec_type == 0x05 )
- {
- /* Unknown, but seen regularly */
- if( p_block_in )
- block_Release(p_block_in);
- }
- else
- {
- msg_Dbg(p_demux, "Invalid record type 0x%02x", p_rec->rec_type );
- if( p_block_in )
- block_Release(p_block_in);
- }
- /* */
- p_sys->i_cur_rec++;
- return 1;
- }
- /* Control */
- static int Control(demux_t *p_demux, int i_query, va_list args)
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- double f, *pf;
- int64_t i64, *p_i64;
- /*msg_Info(p_demux, "control cmd %d", i_query);*/
- switch( i_query )
- {
- case DEMUX_GET_POSITION:
- /* arg is 0.0 - 1.0 percent of overall file position */
- if( ( i64 = p_sys->i_stream_size ) > 0 )
- {
- pf = (double*) va_arg( args, double* );
- *pf = ((double)1.0) * stream_Tell( p_demux->s ) / (double) i64;
- return VLC_SUCCESS;
- }
- return VLC_EGENERIC;
- case DEMUX_SET_POSITION:
- /* arg is 0.0 - 1.0 percent of overall file position */
- f = (double) va_arg( args, double );
- /* msg_Dbg(p_demux, "Control - set position to %2.3f", f); */
- if ((i64 = p_sys->i_stream_size) > 0)
- return ty_stream_seek_pct(p_demux, f);
- return VLC_EGENERIC;
- case DEMUX_GET_TIME:
- /* return TiVo timestamp */
- p_i64 = (int64_t *) va_arg(args, int64_t *);
- //*p_i64 = p_sys->lastAudioPTS - p_sys->firstAudioPTS;
- //*p_i64 = (p_sys->l_last_ty_pts / 1000) + (p_sys->lastAudioPTS -
- // p_sys->l_last_ty_pts_sync);
- *p_i64 = (p_sys->l_last_ty_pts / 1000);
- return VLC_SUCCESS;
- case DEMUX_GET_LENGTH: /* length of program in microseconds, 0 if unk */
- /* size / bitrate */
- p_i64 = (int64_t *) va_arg(args, int64_t *);
- *p_i64 = 0;
- return VLC_SUCCESS;
- case DEMUX_SET_TIME: /* arg is time in microsecs */
- i64 = (int64_t) va_arg( args, int64_t );
- return ty_stream_seek_time(p_demux, i64 * 1000);
- case DEMUX_GET_FPS:
- default:
- return VLC_EGENERIC;
- }
- }
- /* Close */
- static void Close( vlc_object_t *p_this )
- {
- demux_t *p_demux = (demux_t*)p_this;
- demux_sys_t *p_sys = p_demux->p_sys;
- XdsExit( &p_sys->xds );
- cc_Exit( &p_sys->cc );
- free( p_sys->rec_hdrs );
- free( p_sys->seq_table );
- free(p_sys);
- }
- /* =========================================================================== */
- /* Compute Presentation Time Stamp (PTS)
- * Assume buf points to beginning of PTS */
- static mtime_t get_pts( const uint8_t *buf )
- {
- mtime_t i_pts;
- i_pts = ((mtime_t)(buf[0]&0x0e ) << 29)|
- (mtime_t)(buf[1] << 22)|
- ((mtime_t)(buf[2]&0xfe) << 14)|
- (mtime_t)(buf[3] << 7)|
- (mtime_t)(buf[4] >> 1);
- i_pts *= 100 / 9; /* convert PTS (90Khz clock) to microseconds */
- return i_pts;
- }
- /* =========================================================================== */
- static int find_es_header( const uint8_t *header,
- const uint8_t *buffer, int i_search_len )
- {
- int count;
- for( count = 0; count < i_search_len; count++ )
- {
- if( !memcmp( &buffer[count], header, 4 ) )
- return count;
- }
- return -1;
- }
- /* =========================================================================== */
- /* check if we have a full PES header, if not, then save what we have.
- * this is called when audio-start packets are encountered.
- * Returns:
- * 1 partial PES hdr found, some audio data found (buffer adjusted),
- * -1 partial PES hdr found, no audio data found
- * 0 otherwise (complete PES found, pts extracted, pts set, buffer adjusted) */
- /* TODO: HD support -- nothing known about those streams */
- static int check_sync_pes( demux_t *p_demux, block_t *p_block,
- int32_t offset, int32_t rec_len )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- if ( offset < 0 || offset + p_sys->i_Pes_Length > rec_len )
- {
- /* entire PES header not present */
- msg_Dbg( p_demux, "PES header at %d not complete in record. storing.",
- offset );
- /* save the partial pes header */
- if( offset < 0 )
- {
- /* no header found, fake some 00's (this works, believe me) */
- memset( p_sys->pes_buffer, 0, 4 );
- p_sys->i_pes_buf_cnt = 4;
- if( rec_len > 4 )
- msg_Err( p_demux, "PES header not found in record of %d bytes!",
- rec_len );
- return -1;
- }
- /* copy the partial pes header we found */
- memcpy( p_sys->pes_buffer, p_block->p_buffer + offset,
- rec_len - offset );
- p_sys->i_pes_buf_cnt = rec_len - offset;
- if( offset > 0 )
- {
- /* PES Header was found, but not complete, so trim the end of this record */
- p_block->i_buffer -= rec_len - offset;
- return 1;
- }
- return -1; /* partial PES, no audio data */
- }
- /* full PES header present, extract PTS */
- p_sys->lastAudioPTS = get_pts( &p_block->p_buffer[ offset +
- p_sys->i_Pts_Offset ] );
- if (p_sys->firstAudioPTS < 0)
- p_sys->firstAudioPTS = p_sys->lastAudioPTS;
- p_block->i_pts = p_sys->lastAudioPTS;
- /*msg_Dbg(p_demux, "Audio PTS %lld", p_sys->lastAudioPTS );*/
- /* adjust audio record to remove PES header */
- memmove(p_block->p_buffer + offset, p_block->p_buffer + offset +
- p_sys->i_Pes_Length, rec_len - p_sys->i_Pes_Length);
- p_block->i_buffer -= p_sys->i_Pes_Length;
- #if 0
- msg_Dbg(p_demux, "pes hdr removed; buffer len=%d and has "
- "%02x %02x %02x %02x %02x %02x %02x %02x "
- "%02x %02x %02x %02x %02x %02x %02x %02x", p_block->i_buffer,
- p_block->p_buffer[0], p_block->p_buffer[1],
- p_block->p_buffer[2], p_block->p_buffer[3],
- p_block->p_buffer[4], p_block->p_buffer[5],
- p_block->p_buffer[6], p_block->p_buffer[7],
- p_block->p_buffer[8], p_block->p_buffer[9],
- p_block->p_buffer[10], p_block->p_buffer[11],
- p_block->p_buffer[12], p_block->p_buffer[13],
- p_block->p_buffer[14], p_block->p_buffer[15]);
- #endif
- return 0;
- }
- static int DemuxRecVideo( demux_t *p_demux, ty_rec_hdr_t *rec_hdr, block_t *p_block_in )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- const int subrec_type = rec_hdr->subrec_type;
- const long l_rec_size = rec_hdr->l_rec_size; // p_block_in->i_buffer might be better
- int esOffset1;
- int i;
- assert( rec_hdr->rec_type == 0xe0 );
- if( !p_block_in )
- return -1;
- #if 0
- msg_Dbg(p_demux, "packet buffer has "
- "%02x %02x %02x %02x %02x %02x %02x %02x "
- "%02x %02x %02x %02x %02x %02x %02x %02x",
- p_block_in->p_buffer[0], p_block_in->p_buffer[1],
- p_block_in->p_buffer[2], p_block_in->p_buffer[3],
- p_block_in->p_buffer[4], p_block_in->p_buffer[5],
- p_block_in->p_buffer[6], p_block_in->p_buffer[7],
- p_block_in->p_buffer[8], p_block_in->p_buffer[9],
- p_block_in->p_buffer[10], p_block_in->p_buffer[11],
- p_block_in->p_buffer[12], p_block_in->p_buffer[13],
- p_block_in->p_buffer[14], p_block_in->p_buffer[15]);
- #endif
- //if( subrec_type == 0x06 || subrec_type == 0x07 )
- if( subrec_type != 0x02 && subrec_type != 0x0c &&
- subrec_type != 0x08 && l_rec_size > 4 )
- {
- /* get the PTS from this packet if it has one.
- * on S1, only 0x06 has PES. On S2, however, most all do.
- * Do NOT Pass the PES Header to the MPEG2 codec */
- esOffset1 = find_es_header( ty_VideoPacket, p_block_in->p_buffer, 5 );
- if( esOffset1 != -1 )
- {
- //msg_Dbg(p_demux, "Video PES hdr in pkt type 0x%02x at offset %d",
- //subrec_type, esOffset1);
- p_sys->lastVideoPTS = get_pts(
- &p_block_in->p_buffer[ esOffset1 + VIDEO_PTS_OFFSET ] );
- /*msg_Dbg(p_demux, "Video rec %d PTS %"PRId64, p_sys->i_cur_rec,
- p_sys->lastVideoPTS );*/
- if (subrec_type != 0x06) {
- /* if we found a PES, and it's not type 6, then we're S2 */
- /* The packet will have video data (& other headers) so we
- * chop out the PES header and send the rest */
- if (l_rec_size >= VIDEO_PES_LENGTH) {
- p_block_in->p_buffer += VIDEO_PES_LENGTH + esOffset1;
- p_block_in->i_buffer -= VIDEO_PES_LENGTH + esOffset1;
- } else {
- msg_Dbg(p_demux, "video rec type 0x%02x has short PES"
- " (%ld bytes)", subrec_type, l_rec_size);
- /* nuke this block; it's too short, but has PES marker */
- p_block_in->i_buffer = 0;
- }
- }
- }/* else
- msg_Dbg(p_demux, "No Video PES hdr in pkt type 0x%02x",
- subrec_type); */
- }
- if(subrec_type == 0x06 )
- {
- /* type 6 (S1 DTivo) has no data, so we're done */
- block_Release(p_block_in);
- return 0;
- }
- /* if it's not a continue blk, then set PTS */
- if( subrec_type != 0x02 )
- {
- /*msg_Dbg(p_demux, "Video rec %d type 0x%02X", p_sys->i_cur_rec,
- subrec_type);*/
- /* if it's a GOP header, make sure it's legal
- * (if we have enough data) */
- /* Some ty files don't have this bit set
- * and it causes problems */
- if (subrec_type == 0x0c && l_rec_size >= 6)
- p_block_in->p_buffer[5] |= 0x08;
- /* store the TY PTS if there is one */
- if (subrec_type == 0x07) {
- p_sys->l_last_ty_pts = rec_hdr->l_ty_pts;
- /* should we use audio or video PTS? */
- //p_sys->l_last_ty_pts_sync = p_sys->lastAudioPTS;
- } else {
- /* yes I know this is a cheap hack. It's the timestamp
- used for display and skipping fwd/back, so it
- doesn't have to be accurate to the millisecond.
- I adjust it here by roughly one 1/30 sec. Yes it
- will be slightly off for UK streams, but it's OK.
- */
- p_sys->l_last_ty_pts += 35000000;
- //p_sys->l_last_ty_pts += 33366667;
- }
- /* set PTS for this block before we send */
- if (p_sys->lastVideoPTS > 0)
- {
- p_block_in->i_pts = p_sys->lastVideoPTS;
- /* PTS gets used ONCE.
- * Any subsequent frames we get BEFORE next PES
- * header will have their PTS computed in the codec */
- p_sys->lastVideoPTS = 0;
- }
- }
- /* Register the CC decoders when needed */
- for( i = 0; i < 4; i++ )
- {
- static const vlc_fourcc_t fcc[4] = {
- VLC_FOURCC('c', 'c', '1', ' '),
- VLC_FOURCC('c', 'c', '2', ' '),
- VLC_FOURCC('c', 'c', '3', ' '),
- VLC_FOURCC('c', 'c', '4', ' ')
- };
- static const char *ppsz_description[4] = {
- N_("Closed captions 1"),
- N_("Closed captions 2"),
- N_("Closed captions 3"),
- N_("Closed captions 4"),
- };
- es_format_t fmt;
- if( !p_sys->cc.pb_present[i] || p_sys->p_cc[i] )
- continue;
- es_format_Init( &fmt, SPU_ES, fcc[i] );
- fmt.psz_description = strdup( vlc_gettext(ppsz_description[i]) );
- fmt.i_group = TY_ES_GROUP;
- p_sys->p_cc[i] = es_out_Add( p_demux->out, &fmt );
- es_format_Clean( &fmt );
- }
- /* Send the CC data */
- if( p_block_in->i_pts > 0 && p_sys->cc.i_data > 0 )
- {
- for( i = 0; i < 4; i++ )
- {
- if( p_sys->p_cc[i] )
- {
- block_t *p_cc = block_New( p_demux, p_sys->cc.i_data );
- p_cc->i_flags |= BLOCK_FLAG_TYPE_I;
- p_cc->i_pts = p_block_in->i_pts;
- memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
- es_out_Send( p_demux->out, p_sys->p_cc[i], p_cc );
- }
- }
- cc_Flush( &p_sys->cc );
- }
- //msg_Dbg(p_demux, "sending rec %d as video type 0x%02x",
- //p_sys->i_cur_rec, subrec_type);
- es_out_Send(p_demux->out, p_sys->p_video, p_block_in);
- return 0;
- }
- static int DemuxRecAudio( demux_t *p_demux, ty_rec_hdr_t *rec_hdr, block_t *p_block_in )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- const int subrec_type = rec_hdr->subrec_type;
- const long l_rec_size = rec_hdr->l_rec_size;
- int esOffset1;
- assert( rec_hdr->rec_type == 0xc0 );
- if( !p_block_in )
- return -1;
- #if 0
- int i;
- fprintf( stderr, "Audio Packet Header " );
- for( i = 0 ; i < 24 ; i++ )
- fprintf( stderr, "%2.2x ", p_block_in->p_buffer[i] );
- fprintf( stderr, "n" );
- #endif
- if( subrec_type == 2 )
- {
- /* SA or DTiVo Audio Data, no PES (continued block)
- * ================================================
- */
- /* continue PES if previous was incomplete */
- if (p_sys->i_pes_buf_cnt > 0)
- {
- const int i_need = p_sys->i_Pes_Length - p_sys->i_pes_buf_cnt;
- msg_Dbg(p_demux, "continuing PES header");
- /* do we have enough data to complete? */
- if (i_need >= l_rec_size)
- {
- /* don't have complete PES hdr; save what we have and return */
- memcpy(&p_sys->pes_buffer[p_sys->i_pes_buf_cnt],
- p_block_in->p_buffer, l_rec_size);
- p_sys->i_pes_buf_cnt += l_rec_size;
- /* */
- block_Release(p_block_in);
- return 0;
- }
- /* we have enough; reconstruct this p_frame with the new hdr */
- memcpy(&p_sys->pes_buffer[p_sys->i_pes_buf_cnt],
- p_block_in->p_buffer, i_need);
- /* advance the block past the PES header (don't want to send it) */
- p_block_in->p_buffer += i_need;
- p_block_in->i_buffer -= i_need;
- /* get the PTS out of this PES header (MPEG or AC3) */
- if (p_sys->audio_type == TIVO_AUDIO_MPEG)
- esOffset1 = find_es_header(ty_MPEGAudioPacket,
- p_sys->pes_buffer, 5);
- else
- esOffset1 = find_es_header(ty_AC3AudioPacket,
- p_sys->pes_buffer, 5);
- if (esOffset1 < 0)
- {
- /* god help us; something's really wrong */
- msg_Err(p_demux, "can't find audio PES header in packet");
- }
- else
- {
- p_sys->lastAudioPTS = get_pts(
- &p_sys->pes_buffer[ esOffset1 + p_sys->i_Pts_Offset ] );
- p_block_in->i_pts = p_sys->lastAudioPTS;
- }
- p_sys->i_pes_buf_cnt = 0;
- }
- /* S2 DTivo has AC3 packets with 2 padding bytes at end. This is
- * not allowed in the AC3 spec and will cause problems. So here
- * we try to trim things. */
- /* Also, S1 DTivo has alternating short / long AC3 packets. That
- * is, one packet is short (incomplete) and the next packet has
- * the first one's missing data, plus all of its own. Strange. */
- if (p_sys->audio_type == TIVO_AUDIO_AC3 &&
- p_sys->tivo_series == TIVO_SERIES2) {
- if (p_sys->l_ac3_pkt_size + p_block_in->i_buffer >
- AC3_PKT_LENGTH) {
- p_block_in->i_buffer -= 2;
- p_sys->l_ac3_pkt_size = 0;
- } else {
- p_sys->l_ac3_pkt_size += p_block_in->i_buffer;
- }
- }
- }
- else if( subrec_type == 0x03 )
- {
- /* MPEG Audio with PES Header, either SA or DTiVo */
- /* ================================================ */
- esOffset1 = find_es_header( ty_MPEGAudioPacket,
- p_block_in->p_buffer, 5 );
- /*msg_Dbg(p_demux, "buffer has %#02x %#02x %#02x %#02x",
- p_block_in->p_buffer[0], p_block_in->p_buffer[1],
- p_block_in->p_buffer[2], p_block_in->p_buffer[3]);
- msg_Dbg(p_demux, "audio ES hdr at offset %d", esOffset1);*/
- /* SA PES Header, No Audio Data */
- /* ================================================ */
- if ( ( esOffset1 == 0 ) && ( l_rec_size == 16 ) )
- {
- p_sys->lastAudioPTS = get_pts( &p_block_in->p_buffer[
- SA_PTS_OFFSET ] );
- if (p_sys->firstAudioPTS < 0)
- p_sys->firstAudioPTS = p_sys->lastAudioPTS;
- block_Release(p_block_in);
- return 0;
- /*msg_Dbg(p_demux, "SA Audio PTS %lld",
- p_sys->lastAudioPTS );*/
- }
- /* DTiVo Audio with PES Header */
- /* ================================================ */
- /* Check for complete PES */
- if (check_sync_pes(p_demux, p_block_in, esOffset1,
- l_rec_size) == -1)
- {
- /* partial PES header found, nothing else.
- * we're done. */
- block_Release(p_block_in);
- return 0;
- }
- #if 0
- msg_Dbg(p_demux, "packet buffer has "
- "%02x %02x %02x %02x %02x %02x %02x %02x "
- "%02x %02x %02x %02x %02x %02x %02x %02x",
- p_block_in->p_buffer[0], p_block_in->p_buffer[1],
- p_block_in->p_buffer[2], p_block_in->p_buffer[3],
- p_block_in->p_buffer[4], p_block_in->p_buffer[5],
- p_block_in->p_buffer[6], p_block_in->p_buffer[7],
- p_block_in->p_buffer[8], p_block_in->p_buffer[9],
- p_block_in->p_buffer[10], p_block_in->p_buffer[11],
- p_block_in->p_buffer[12], p_block_in->p_buffer[13],
- p_block_in->p_buffer[14], p_block_in->p_buffer[15]);
- #endif
- }
- else if( subrec_type == 0x04 )
- {
- /* SA Audio with no PES Header */
- /* ================================================ */
- /*msg_Dbg(p_demux,
- "Adding SA Audio Packet Size %ld", l_rec_size ); */
- if (p_sys->lastAudioPTS > 0)
- p_block_in->i_pts = p_sys->lastAudioPTS;
- }
- else if( subrec_type == 0x09 )
- {
- /* DTiVo AC3 Audio Data with PES Header */
- /* ================================================ */
- esOffset1 = find_es_header( ty_AC3AudioPacket,
- p_block_in->p_buffer, 5 );
- #if 0
- msg_Dbg(p_demux, "buffer has "
- "%02x %02x %02x %02x %02x %02x %02x %02x "
- "%02x %02x %02x %02x %02x %02x %02x %02x",
- p_block_in->p_buffer[0], p_block_in->p_buffer[1],
- p_block_in->p_buffer[2], p_block_in->p_buffer[3],
- p_block_in->p_buffer[4], p_block_in->p_buffer[5],
- p_block_in->p_buffer[6], p_block_in->p_buffer[7],
- p_block_in->p_buffer[8], p_block_in->p_buffer[9],
- p_block_in->p_buffer[10], p_block_in->p_buffer[11],
- p_block_in->p_buffer[12], p_block_in->p_buffer[13],
- p_block_in->p_buffer[14], p_block_in->p_buffer[15]);
- msg_Dbg(p_demux, "audio ES AC3 hdr at offset %d", esOffset1);
- #endif
- /* Check for complete PES */
- if (check_sync_pes(p_demux, p_block_in, esOffset1,
- l_rec_size) == -1)
- {
- /* partial PES header found, nothing else. we're done. */
- block_Release(p_block_in);
- return 0;
- }
- /* S2 DTivo has invalid long AC3 packets */
- if (p_sys->tivo_series == TIVO_SERIES2) {
- if (p_block_in->i_buffer > AC3_PKT_LENGTH) {
- p_block_in->i_buffer -= 2;
- p_sys->l_ac3_pkt_size = 0;
- } else {
- p_sys->l_ac3_pkt_size = p_block_in->i_buffer;
- }
- }
- }
- else
- {
- /* Unsupported/Unknown */
- block_Release(p_block_in);
- return 0;
- }
- /* set PCR before we send (if PTS found) */
- if( p_block_in->i_pts > 0 )
- es_out_Control( p_demux->out, ES_OUT_SET_PCR,
- p_block_in->i_pts );
- /* Send data */
- es_out_Send( p_demux->out, p_sys->p_audio, p_block_in );
- return 0;
- }
- static int DemuxRecCc( demux_t *p_demux, ty_rec_hdr_t *rec_hdr, block_t *p_block_in )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- int i_field;
- if( p_block_in )
- block_Release(p_block_in);
- if( rec_hdr->rec_type == 0x01 )
- i_field = 0;
- else if( rec_hdr->rec_type == 0x02 )
- i_field = 1;
- else
- return 0;
- /* XDS data (extract programs infos) transmitted on field 2 only */
- if( i_field == 1 )
- DemuxDecodeXds( p_demux, rec_hdr->ex[0], rec_hdr->ex[1] );
- if( p_sys->cc.i_data + 3 > CC_MAX_DATA_SIZE )
- return 0;
- cc_AppendData( &p_sys->cc, i_field, rec_hdr->ex );
- return 0;
- }
- /* seek to a position within the stream, if possible */
- static int ty_stream_seek_pct(demux_t *p_demux, double seek_pct)
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- int64_t seek_pos = p_sys->i_stream_size * seek_pct;
- long l_skip_amt;
- int i;
- unsigned i_cur_part;
- /* if we're not seekable, there's nothing to do */
- if (!p_sys->b_seekable)
- return VLC_EGENERIC;
- /* figure out which part & chunk we want & go there */
- i_cur_part = seek_pos / TIVO_PART_LENGTH;
- p_sys->i_cur_chunk = seek_pos / CHUNK_SIZE;
- /* try to read the part header (master chunk) if it's there */
- if ( stream_Seek( p_demux->s, i_cur_part * TIVO_PART_LENGTH ))
- {
- /* can't seek stream */
- return VLC_EGENERIC;
- }
- parse_master(p_demux);
- /* now for the actual chunk */
- if ( stream_Seek( p_demux->s, p_sys->i_cur_chunk * CHUNK_SIZE))
- {
- /* can't seek stream */
- return VLC_EGENERIC;
- }
- /* load the chunk */
- p_sys->i_stuff_cnt = 0;
- get_chunk_header(p_demux);
- /* seek within the chunk to get roughly to where we want */
- p_sys->i_cur_rec = (int)
- ((double) ((seek_pos % CHUNK_SIZE) / (double) (CHUNK_SIZE)) * p_sys->i_num_recs);
- msg_Dbg(p_demux, "Seeked to file pos %"PRId64, seek_pos);
- msg_Dbg(p_demux, " (chunk %d, record %d)",
- p_sys->i_cur_chunk - 1, p_sys->i_cur_rec);
- /* seek to the start of this record's data.
- * to do that, we have to skip past all prior records */
- l_skip_amt = 0;
- for (i=0; i<p_sys->i_cur_rec; i++)
- l_skip_amt += p_sys->rec_hdrs[i].l_rec_size;
- stream_Seek(p_demux->s, ((p_sys->i_cur_chunk-1) * CHUNK_SIZE) +
- (p_sys->i_num_recs * 16) + l_skip_amt + 4);
- /* to hell with syncing any audio or video, just start reading records... :) */
- /*p_sys->lastAudioPTS = p_sys->lastVideoPTS = 0;*/
- return VLC_SUCCESS;
- }
- /* XDS decoder */
- //#define TY_XDS_DEBUG
- static void XdsInit( xds_t *h )
- {
- int i, j;
- h->b_xds = false;
- h->i_class = XDS_MAX_CLASS_COUNT;
- h->i_type = 0;
- h->b_future = false;
- for( i = 0; i < XDS_MAX_CLASS_COUNT; i++ )
- {
- for( j = 0; j < 128; j++ )
- h->pkt[i][j].b_started = false;
- }
- h->b_meta_changed = false;
- memset( &h->meta, 0, sizeof(h->meta) );
- }
- static void XdsExit( xds_t *h )
- {
- /* */
- free( h->meta.psz_channel_name );
- free( h->meta.psz_channel_call_letter );
- free( h->meta.psz_channel_number );
- /* */
- free( h->meta.current.psz_name );
- free( h->meta.current.psz_rating );
- /* */
- free( h->meta.future.psz_name );
- free( h->meta.future.psz_rating );
- }
- static void XdsStringUtf8( char dst[2*32+1], const uint8_t *p_src, int i_src )
- {
- int i;
- int i_dst;
- for( i = 0, i_dst = 0; i < i_src; i++ )
- {
- switch( p_src[i] )
- {
- #define E2( c, u1, u2 ) case c: dst[i_dst++] = u1; dst[i_dst++] = u2; break
- E2( 0x2a, 0xc3,0xa1); // lowercase a, acute accent
- E2( 0x5c, 0xc3,0xa9); // lowercase e, acute accent
- E2( 0x5e, 0xc3,0xad); // lowercase i, acute accent
- E2( 0x5f, 0xc3,0xb3); // lowercase o, acute accent
- E2( 0x60, 0xc3,0xba); // lowercase u, acute accent
- E2( 0x7b, 0xc3,0xa7); // lowercase c with cedilla
- E2( 0x7c, 0xc3,0xb7); // division symbol
- E2( 0x7d, 0xc3,0x91); // uppercase N tilde
- E2( 0x7e, 0xc3,0xb1); // lowercase n tilde
- #undef E2
- default:
- dst[i_dst++] = p_src[i];
- break;
- }
- }
- dst[i_dst++] = ' ';
- }
- static bool XdsChangeString( xds_t *h, char **ppsz_dst, const char *psz_new )
- {
- if( *ppsz_dst && psz_new && !strcmp( *ppsz_dst, psz_new ) )
- return false;
- if( *ppsz_dst == NULL && psz_new == NULL )
- return false;
- free( *ppsz_dst );
- if( psz_new )
- *ppsz_dst = strdup( psz_new );
- else
- *ppsz_dst = NULL;
- h->b_meta_changed = true;
- return true;
- }
- static void XdsDecodeCurrentFuture( xds_t *h, xds_packet_t *pk )
- {
- xds_meta_program_t *p_prg = h->b_future ? &h->meta.future : &h->meta.current;
- char name[2*32+1];
- int i_rating;
- switch( h->i_type )
- {
- case 0x03:
- XdsStringUtf8( name, pk->p_data, pk->i_data );
- if( XdsChangeString( h, &p_prg->psz_name, name ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Current/Future (Program Name) %d'n", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> program name %sn", name );
- }
- break;
- case 0x05:
- i_rating = (pk->p_data[0] & 0x18);
- if( i_rating == 0x08 )
- {
- /* TPG */
- static const char *pppsz_ratings[8][2] = {
- { "None", "No rating (no content advisory)" },
- { "TV-Y", "All Children (no content advisory)" },
- { "TV-Y7", "Directed to Older Children (V = Fantasy Violence)" },
- { "TV-G", "General Audience (no content advisory)" },
- { "TV-PG", "Parental Guidance Suggested" },
- { "TV-14", "Parents Strongly Cautioned" },
- { "TV-MA", "Mature Audience Only" },
- { "None", "No rating (no content advisory)" }
- };
- p_prg->rating = XDS_META_PROGRAM_RATING_TPG;
- if( XdsChangeString( h, &p_prg->psz_rating, pppsz_ratings[pk->p_data[1]&0x07][0] ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Current/Future (Rating) %d'n", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> TPG Rating %s (%s)n",
- // pppsz_ratings[pk->p_data[1]&0x07][0], pppsz_ratings[pk->p_data[1]&0x07][1] );
- }
- }
- else if( i_rating == 0x00 || i_rating == 0x10 )
- {
- /* MPAA */
- static const char *pppsz_ratings[8][2] = {
- { "N/A", "N/A" },
- { "G", "General Audiences" },
- { "PG", "Parental Guidance Suggested" },
- { "PG-13", "Parents Strongly Cautioned" },
- { "R", "Restricted" },
- { "NC-17", "No one 17 and under admitted" },
- { "X", "No one under 17 admitted" },
- { "NR", "Not Rated" },
- };
- p_prg->rating = XDS_META_PROGRAM_RATING_MPAA;
- if( XdsChangeString( h, &p_prg->psz_rating, pppsz_ratings[pk->p_data[0]&0x07][0] ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Current/Future (Rating) %d'n", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> TPG Rating %s (%s)n",
- // pppsz_ratings[pk->p_data[0]&0x07][0], pppsz_ratings[pk->p_data[0]&0x07][1] );
- }
- }
- else
- {
- /* Non US Rating TODO */
- assert( i_rating == 0x18 ); // only left value possible */
- p_prg->rating = XDS_META_PROGRAM_RATING_NONE;
- if( XdsChangeString( h, &p_prg->psz_rating, NULL ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Current/Future (Rating) %d'n", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> 0x%2.2x 0x%2.2xn", pk->p_data[0], pk->p_data[1] );
- }
- }
- break;
- default:
- #ifdef TY_XDS_DEBUG
- fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Current/Future (Unknown 0x%x)'n", h->i_type );
- #endif
- break;
- }
- }
- static void XdsDecodeChannel( xds_t *h, xds_packet_t *pk )
- {
- char name[2*32+1];
- char chan[2*32+1];
- switch( h->i_type )
- {
- case 0x01:
- if( pk->i_data < 2 )
- return;
- XdsStringUtf8( name, pk->p_data, pk->i_data );
- if( XdsChangeString( h, &h->meta.psz_channel_name, name ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Channel (Network Name) %d'n", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> %sn", name );
- }
- break;
- case 0x02:
- if( pk->i_data < 4 )
- return;
- XdsStringUtf8( name, pk->p_data, 4 );
- if( XdsChangeString( h, &h->meta.psz_channel_call_letter, name ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Channel (Network Call Letter)' %dn", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> call letter %sn", name );
- }
- if( pk->i_data >= 6 )
- {
- XdsStringUtf8( chan, &pk->p_data[4], 2 );
- if( XdsChangeString( h, &h->meta.psz_channel_number, chan ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Channel (Network Call Letter)' %dn", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> channel number %sn", chan );
- }
- }
- else
- {
- if( XdsChangeString( h, &h->meta.psz_channel_number, NULL ) )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Channel (Network Call Letter)' %dn", pk->i_data );
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: ====> no channel number letter anymoren" );
- }
- }
- break;
- case 0x03:
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Channel (Channel Tape Delay)'n" );
- break;
- case 0x04:
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Channel (Transmission Signal Identifier)'n" );
- break;
- default:
- #ifdef TY_XDS_DEBUG
- fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Channel (Unknown 0x%x)'n", h->i_type );
- #endif
- break;
- }
- }
- static void XdsDecode( xds_t *h, xds_packet_t *pk )
- {
- switch( h->i_class )
- {
- case XDS_CLASS_CURRENT:
- case XDS_CLASS_FUTURE:
- XdsDecodeCurrentFuture( h, pk );
- break;
- case XDS_CLASS_CHANNEL:
- XdsDecodeChannel( h, pk );
- break;
- case XDS_CLASS_MISCELLANEOUS:
- #ifdef TY_XDS_DEBUG
- fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Miscellaneous'n" );
- #endif
- break;
- case XDS_CLASS_PUBLIC_SERVICE:
- #ifdef TY_XDS_DEBUG
- fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: class 'Public Service'n" );
- #endif
- break;
- default:
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS XdsDecode: unknown classn" );
- break;
- }
- }
- static void XdsParse( xds_t *h, uint8_t d1, uint8_t d2 )
- {
- /* TODO check parity */
- d1 &= 0x7f;
- d2 &= 0x7f;
- /* */
- if( d1 >= 0x01 && d1 <= 0x0e )
- {
- const xds_class_t i_class = ( d1 - 1 ) >> 1;
- const int i_type = d2;
- const bool b_start = d1 & 0x01;
- xds_packet_t *pk = &h->pkt[i_class][i_type];
- if( !b_start && !pk->b_started )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS Continuying a non started packet, ignoringn" );
- h->b_xds = false;
- return;
- }
- h->b_xds = true;
- h->i_class = i_class;
- h->i_type = i_type;
- h->b_future = !b_start;
- pk->b_started = true;
- if( b_start )
- {
- pk->i_data = 0;
- pk->i_sum = d1 + d2;
- }
- }
- else if( d1 == 0x0f && h->b_xds )
- {
- xds_packet_t *pk = &h->pkt[h->i_class][h->i_type];
- /* TODO checksum and decode */
- pk->i_sum += d1 + d2;
- if( pk->i_sum & 0x7f )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS invalid checksum, ignoring ---------------------------------n" );
- pk->b_started = false;
- return;
- }
- if( pk->i_data <= 0 )
- {
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS empty packet, ignoring ---------------------------------n" );
- pk->b_started = false;
- return;
- }
- //if( pk->p_data[pk->i_data-1] == 0x40 ) /* Padding byte */
- // pk->i_data--;
- XdsDecode( h, pk );
- /* Reset it */
- pk->b_started = false;
- }
- else if( d1 >= 0x20 && h->b_xds )
- {
- xds_packet_t *pk = &h->pkt[h->i_class][h->i_type];
- if( pk->i_data+2 > XDS_MAX_DATA_SIZE )
- {
- /* Broken -> reinit */
- //fprintf( stderr, "xxxxxxxxxxxxxxxXDS broken, resetn" );
- h->b_xds = false;
- pk->b_started = false;
- return;
- }
- /* TODO check parity bit */
- pk->p_data[pk->i_data++] = d1 & 0x7f;
- pk->p_data[pk->i_data++] = d2 & 0x7f;
- pk->i_sum += d1+d2;
- }
- else
- {
- h->b_xds = false;
- }
- }
- static void DemuxDecodeXds( demux_t *p_demux, uint8_t d1, uint8_t d2 )
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- XdsParse( &p_demux->p_sys->xds, d1, d2 );
- if( p_demux->p_sys->xds.b_meta_changed )
- {
- xds_meta_t *m = &p_sys->xds.meta;
- vlc_meta_t *p_meta;
- vlc_epg_t *p_epg;
- /* Channel meta data */
- p_meta = vlc_meta_New();
- if( m->psz_channel_name )
- vlc_meta_SetPublisher( p_meta, m->psz_channel_name );
- if( m->psz_channel_call_letter )
- vlc_meta_SetTitle( p_meta, m->psz_channel_call_letter );
- if( m->psz_channel_number )
- vlc_meta_AddExtra( p_meta, "Channel number", m->psz_channel_number );
- es_out_Control( p_demux->out, ES_OUT_SET_GROUP_META, TY_ES_GROUP, p_meta );
- vlc_meta_Delete( p_meta );
- /* Event meta data (current/future) */
- p_epg = vlc_epg_New( NULL );
- if( m->current.psz_name )
- {
- vlc_epg_AddEvent( p_epg, 0, 0, m->current.psz_name, NULL, NULL );
- //if( m->current.psz_rating )
- // TODO but VLC cannot yet handle rating per epg event
- vlc_epg_SetCurrent( p_epg, 0 );
- }
- if( m->future.psz_name )
- {
- }
- if( p_epg->i_event > 0 )
- es_out_Control( p_demux->out, ES_OUT_SET_GROUP_EPG, TY_ES_GROUP, p_epg );
- vlc_epg_Delete( p_epg );
- }
- p_demux->p_sys->xds.b_meta_changed = false;
- }
- /* seek to an exact time position within the stream, if possible.
- * l_seek_time is in nanoseconds, the TIVO time standard.
- */
- static int ty_stream_seek_time(demux_t *p_demux, uint64_t l_seek_time)
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- int i_seq_entry = 0;
- int i_skip_cnt;
- unsigned i;
- long l_cur_pos = stream_Tell(p_demux->s);
- unsigned i_cur_part = l_cur_pos / TIVO_PART_LENGTH;
- long l_seek_secs = l_seek_time / 1000000000;
- uint64_t l_fwd_stamp = 1;
- /* if we're not seekable, there's nothing to do */
- if (!p_sys->b_seekable || !p_sys->b_have_master)
- return VLC_EGENERIC;
- msg_Dbg(p_demux, "Skipping to time %02ld:%02ld:%02ld",
- l_seek_secs / 3600, (l_seek_secs / 60) % 60, l_seek_secs % 60);
- /* seek to the proper segment if necessary */
- /* first see if we need to go back */
- while (l_seek_time < p_sys->l_first_ty_pts) {
- msg_Dbg(p_demux, "skipping to prior segment.");
- /* load previous part */
- if (i_cur_part == 0) {
- stream_Seek(p_demux->s, l_cur_pos);
- msg_Err(p_demux, "Attempt to seek past BOF");
- return VLC_EGENERIC;
- }
- stream_Seek(p_demux->s, (i_cur_part - 1) * TIVO_PART_LENGTH);
- i_cur_part--;
- parse_master(p_demux);
- }
- /* maybe we need to go forward */
- while (l_seek_time > p_sys->l_final_ty_pts) {
- msg_Dbg(p_demux, "skipping to next segment.");
- /* load next part */
- if ((i_cur_part + 1) * TIVO_PART_LENGTH > p_sys->i_stream_size) {
- /* error; restore previous file position */
- stream_Seek(p_demux->s, l_cur_pos);
- msg_Err(p_demux, "seek error");
- return VLC_EGENERIC;
- }
- stream_Seek(p_demux->s, (i_cur_part + 1) * TIVO_PART_LENGTH);
- i_cur_part++;
- parse_master(p_demux);
- }
- /* our target is somewhere within this part;
- find the proper chunk using seq_table */
- for (i=1; i<p_sys->i_seq_table_size; i++) {
- if (p_sys->seq_table[i].l_timestamp > l_seek_time) {
- /* i-1 is the section we want; remember the next timestamp in case
- we have to use it (this section may not have a proper SEQ hdr
- for the time we're seeking) */
- msg_Dbg(p_demux, "stopping at seq entry %d.", i);
- l_fwd_stamp = p_sys->seq_table[i].l_timestamp;
- i_seq_entry = i-1;
- break;
- }
- }
- /* if we went through the entire last loop and didn't find our target,
- then we skip to the next part. What has happened is that the actual
- time we're seeking is within this part, but there isn't a SEQ hdr
- for it here. So we skip to the next part */
- if (i == p_sys->i_seq_table_size) {
- if ((i_cur_part + 1) * TIVO_PART_LENGTH > p_sys->i_stream_size) {
- /* error; restore previous file position */
- stream_Seek(p_demux->s, l_cur_pos);
- msg_Err(p_demux, "seek error");
- return VLC_EGENERIC;
- }
- stream_Seek(p_demux->s, (i_cur_part + 1) * TIVO_PART_LENGTH);
- i_cur_part++;
- parse_master(p_demux);
- i_seq_entry = 0;
- }
- /* determine which chunk has our seek_time */
- for (i=0; i<p_sys->i_bits_per_seq_entry; i++) {
- long l_chunk_nr = i_seq_entry * p_sys->i_bits_per_seq_entry + i;
- long l_chunk_offset = (l_chunk_nr + 1) * CHUNK_SIZE;
- msg_Dbg(p_demux, "testing part %d chunk %ld mask 0x%02X bit %d",
- i_cur_part, l_chunk_nr,
- p_sys->seq_table[i_seq_entry].chunk_bitmask[i/8], i%8);
- if (p_sys->seq_table[i_seq_entry].chunk_bitmask[i/8] & (1 << (i%8))) {
- /* check this chunk's SEQ header timestamp */
- msg_Dbg(p_demux, "has SEQ. seeking to chunk at 0x%lX",
- (i_cur_part * TIVO_PART_LENGTH) + l_chunk_offset);
- stream_Seek(p_demux->s, (i_cur_part * TIVO_PART_LENGTH) +
- l_chunk_offset);
- // TODO: we don't have to parse the full header set;
- // just test the seq_rec entry for its timestamp
- p_sys->i_stuff_cnt = 0;
- get_chunk_header(p_demux);
- // check ty PTS for the SEQ entry in this chunk
- if (p_sys->i_seq_rec < 0 || p_sys->i_seq_rec > p_sys->i_num_recs) {
- msg_Err(p_demux, "no SEQ hdr in chunk; table had one.");
- /* Seek to beginning of original chunk & reload it */
- stream_Seek(p_demux->s, (l_cur_pos / CHUNK_SIZE) * CHUNK_SIZE);
- p_sys->i_stuff_cnt = 0;
- get_chunk_header(p_demux);
- return VLC_EGENERIC;
- }
- l_seek_secs = p_sys->rec_hdrs[p_sys->i_seq_rec].l_ty_pts /
- 1000000000;
- msg_Dbg(p_demux, "found SEQ hdr for timestamp %02ld:%02ld:%02ld",
- l_seek_secs / 3600,
- (l_seek_secs / 60) % 60, l_seek_secs % 60);
- if (p_sys->rec_hdrs[p_sys->i_seq_rec].l_ty_pts >= l_seek_time) {
- // keep this one? go back?
- /* for now, we take this one. it's the first SEQ hdr AFTER
- the time we were searching for. */
- msg_Dbg(p_demux, "seek target found.");
- break;
- }
- msg_Dbg(p_demux, "timestamp too early. still scanning.");
- }
- }
- /* if we made it through this entire loop without finding our target,
- then we skip to the next section. What has happened is that the actual
- time we're seeking is within this section, but there isn't a SEQ hdr
- for it here. So we skip to the next closest one (l_fwd_stamp) */
- if (i == p_sys->i_bits_per_seq_entry)
- return ty_stream_seek_time(p_demux, l_fwd_stamp);
- /* current stream ptr is at beginning of data for this chunk,
- so we need to skip past any stream data prior to the seq_rec
- in this chunk */
- i_skip_cnt = 0;
- for (int j=0; j<p_sys->i_seq_rec; j++)
- i_skip_cnt += p_sys->rec_hdrs[j].l_rec_size;
- stream_Read(p_demux->s, NULL, i_skip_cnt);
- p_sys->i_cur_rec = p_sys->i_seq_rec;
- //p_sys->l_last_ty_pts = p_sys->rec_hdrs[p_sys->i_seq_rec].l_ty_pts;
- //p_sys->l_last_ty_pts_sync = p_sys->lastAudioPTS;
- return VLC_SUCCESS;
- }
- /* parse a master chunk, filling the SEQ table and other variables.
- * We assume the stream is currently pointing to it.
- */
- static void parse_master(demux_t *p_demux)
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- uint8_t mst_buf[32];
- uint32_t i, i_map_size;
- int64_t i_save_pos = stream_Tell(p_demux->s);
- int64_t i_pts_secs;
- /* Note that the entries in the SEQ table in the stream may have
- different sizes depending on the bits per entry. We store them
- all in the same size structure, so we have to parse them out one
- by one. If we had a dynamic structure, we could simply read the
- entire table directly from the stream into memory in place. */
- /* clear the SEQ table */
- free(p_sys->seq_table);
- /* parse header info */
- stream_Read(p_demux->s, mst_buf, 32);
- i_map_size = U32_AT(&mst_buf[20]); /* size of bitmask, in bytes */
- p_sys->i_bits_per_seq_entry = i_map_size * 8;
- i = U32_AT(&mst_buf[28]); /* size of SEQ table, in bytes */
- p_sys->i_seq_table_size = i / (8 + i_map_size);
- /* parse all the entries */
- p_sys->seq_table = calloc(p_sys->i_seq_table_size, sizeof(ty_seq_table_t));
- if (p_sys->seq_table == NULL)
- {
- p_sys->i_seq_table_size = 0;
- return;
- }
- for (unsigned i=0; i<p_sys->i_seq_table_size; i++) {
- stream_Read(p_demux->s, mst_buf, 8);
- p_sys->seq_table[i].l_timestamp = U64_AT(&mst_buf[0]);
- if (i_map_size > 8) {
- msg_Err(p_demux, "Unsupported SEQ bitmap size in master chunk");
- stream_Read(p_demux->s, NULL, i_map_size);
- } else {
- stream_Read(p_demux->s, mst_buf + 8, i_map_size);
- memcpy(p_sys->seq_table[i].chunk_bitmask, &mst_buf[8], i_map_size);
- }
- }
- /* set up a few of our variables */
- p_sys->l_first_ty_pts = p_sys->seq_table[0].l_timestamp;
- p_sys->l_final_ty_pts =
- p_sys->seq_table[p_sys->i_seq_table_size - 1].l_timestamp;
- p_sys->b_have_master = true;
- i_pts_secs = p_sys->l_first_ty_pts / 1000000000;
- msg_Dbg( p_demux,
- "first TY pts in master is %02"PRId64":%02"PRId64":%02"PRId64,
- i_pts_secs / 3600, (i_pts_secs / 60) % 60, i_pts_secs % 60 );
- i_pts_secs = p_sys->l_final_ty_pts / 1000000000;
- msg_Dbg( p_demux,
- "final TY pts in master is %02"PRId64":%02"PRId64":%02"PRId64,
- i_pts_secs / 3600, (i_pts_secs / 60) % 60, i_pts_secs % 60 );
- /* seek past this chunk */
- stream_Seek(p_demux->s, i_save_pos + CHUNK_SIZE);
- }
- /* ======================================================================== */
- /* "Peek" at some chunks. Skip over the Part header if we find it.
- * We parse the peeked data and determine audio type,
- * SA vs. DTivo, & Tivo Series.
- * Set global vars i_Pes_Length, i_Pts_Offset,
- * p_sys->tivo_series, p_sys->tivo_type, p_sys->audio_type */
- static int probe_stream(demux_t *p_demux)
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- const uint8_t *p_buf;
- int i;
- bool b_probe_error = false;
- /* we need CHUNK_PEEK_COUNT chunks of data, first one might be a Part header, so ... */
- if (stream_Peek( p_demux->s, &p_buf, CHUNK_PEEK_COUNT * CHUNK_SIZE ) <
- CHUNK_PEEK_COUNT * CHUNK_SIZE) {
- msg_Err(p_demux, "Can't peek %d chunks", CHUNK_PEEK_COUNT);
- /* TODO: if seekable, then loop reading chunks into a temp buffer */
- return VLC_EGENERIC;
- }
- /* the real work: analyze this chunk */
- for (i = 0; i < CHUNK_PEEK_COUNT; i++) {
- analyze_chunk(p_demux, p_buf);
- if (p_sys->tivo_series != TIVO_SERIES_UNKNOWN &&
- p_sys->audio_type != TIVO_AUDIO_UNKNOWN &&
- p_sys->tivo_type != TIVO_TYPE_UNKNOWN)
- break;
- p_buf += CHUNK_SIZE;
- }
- /* the final tally */
- if (p_sys->tivo_series == TIVO_SERIES_UNKNOWN) {
- msg_Err(p_demux, "Can't determine Tivo Series.");
- b_probe_error = true;
- }
- if (p_sys->audio_type == TIVO_AUDIO_UNKNOWN) {
- msg_Err(p_demux, "Can't determine Tivo Audio Type.");
- b_probe_error = true;
- }
- if (p_sys->tivo_type == TIVO_TYPE_UNKNOWN) {
- msg_Err(p_demux, "Can't determine Tivo Type (SA/DTivo).");
- b_probe_error = true;
- }
- return b_probe_error?VLC_EGENERIC:VLC_SUCCESS;
- }
- /* ======================================================================== */
- /* gather statistics for this chunk & set our tivo-type vars accordingly */
- static void analyze_chunk(demux_t *p_demux, const uint8_t *p_chunk)
- {
- demux_sys_t *p_sys = p_demux->p_sys;
- int i_num_recs, i;
- ty_rec_hdr_t *p_hdrs;
- int i_num_6e0, i_num_be0, i_num_9c0, i_num_3c0;
- int i_payload_size;
- /* skip if it's a Part header */
- if( U32_AT( &p_chunk[ 0 ] ) == TIVO_PES_FILEID )
- return;
- /* number of records in chunk (we ignore high order byte;
- * rarely are there > 256 chunks & we don't need that many anyway) */
- i_num_recs = p_chunk[0];
- if (i_num_recs < 5) {
- /* try again with the next chunk. Sometimes there are dead ones */
- return;
- }
- p_chunk += 4; /* skip past rec count & SEQ bytes */
- //msg_Dbg(p_demux, "probe: chunk has %d recs", i_num_recs);
- p_hdrs = parse_chunk_headers(p_chunk, i_num_recs, &i_payload_size);
- /* scan headers.
- * 1. check video packets. Presence of 0x6e0 means S1.
- * No 6e0 but have be0 means S2.
- * 2. probe for audio 0x9c0 vs 0x3c0 (AC3 vs Mpeg)
- * If AC-3, then we have DTivo.
- * If MPEG, search for PTS offset. This will determine SA vs. DTivo.
- */
- i_num_6e0 = i_num_be0 = i_num_9c0 = i_num_3c0 = 0;
- for (i=0; i<i_num_recs; i++) {
- //msg_Dbg(p_demux, "probe: rec is %d/%d = 0x%04x", p_hdrs[i].subrec_type,
- //p_hdrs[i].rec_type,
- //p_hdrs[i].subrec_type << 8 | p_hdrs[i].rec_type);
- switch (p_hdrs[i].subrec_type << 8 | p_hdrs[i].rec_type) {
- case 0x6e0:
- i_num_6e0++;
- break;
- case 0xbe0:
- i_num_be0++;
- break;
- case 0x3c0:
- i_num_3c0++;
- break;
- case 0x9c0:
- i_num_9c0++;
- break;
- }
- }
- msg_Dbg(p_demux, "probe: chunk has %d 0x6e0 recs, %d 0xbe0 recs.",
- i_num_6e0, i_num_be0);
- /* set up our variables */
- if (i_num_6e0 > 0) {
- msg_Dbg(p_demux, "detected Series 1 Tivo");
- p_sys->tivo_series = TIVO_SERIES1;
- p_sys->i_Pes_Length = SERIES1_PES_LENGTH;
- } else if (i_num_be0 > 0) {
- msg_Dbg(p_demux, "detected Series 2 Tivo");
- p_sys->tivo_series = TIVO_SERIES2;
- p_sys->i_Pes_Length = SERIES2_PES_LENGTH;
- }
- if (i_num_9c0 > 0) {
- msg_Dbg(p_demux, "detected AC-3 Audio (DTivo)" );
- p_sys->audio_type = TIVO_AUDIO_AC3;
- p_sys->tivo_type = TIVO_TYPE_DTIVO;
- p_sys->i_Pts_Offset = AC3_PTS_OFFSET;
- p_sys->i_Pes_Length = AC3_PES_LENGTH;
- } else if (i_num_3c0 > 0) {
- p_sys->audio_type = TIVO_AUDIO_MPEG;
- msg_Dbg(p_demux, "detected MPEG Audio" );
- }
- /* if tivo_type still unknown, we can check PTS location
- * in MPEG packets to determine tivo_type */
- if (p_sys->tivo_type == TIVO_TYPE_UNKNOWN) {
- uint32_t i_data_offset = (16 * i_num_recs);
- for (i=0; i<i_num_recs; i++) {
- if ((p_hdrs[i].subrec_type << 0x08 | p_hdrs[i].rec_type) == 0x3c0 &&
- p_hdrs[i].l_rec_size > 15) {
- /* first make sure we're aligned */
- int i_pes_offset = find_es_header(ty_MPEGAudioPacket,
- &p_chunk[i_data_offset], 5);
- if (i_pes_offset >= 0) {
- /* pes found. on SA, PES has hdr data at offset 6, not PTS. */
- //msg_Dbg(p_demux, "probe: mpeg es header found in rec %d at offset %d",
- //i, i_pes_offset);
- if ((p_chunk[i_data_offset + 6 + i_pes_offset] & 0x80) == 0x80) {
- /* S1SA or S2(any) Mpeg Audio (PES hdr, not a PTS start) */
- if (p_sys->tivo_series == TIVO_SERIES1)
- msg_Dbg(p_demux, "detected Stand-Alone Tivo" );
- p_sys->tivo_type = TIVO_TYPE_SA;
- p_sys->i_Pts_Offset = SA_PTS_OFFSET;
- } else {
- if (p_sys->tivo_series == TIVO_SERIES1)
- msg_Dbg(p_demux, "detected DirecTV Tivo" );
- p_sys->tivo_type = TIVO_TYPE_DTIVO;
- p_sys->i_Pts_Offset = DTIVO_PTS_OFFSET;
- }
- break;
- }
- }
- i_data_offset += p_hdrs[i].l_rec_size;
- }
- }
- free(p_hdrs);
- }
- /* =========================================================================== */
- static int get_chunk_header(demux_t *p_demux)
- {
- int i_readSize, i_num_recs;
- uint8_t *p_hdr_buf;
- const uint8_t *p_peek;
- demux_sys_t *p_sys = p_demux->p_sys;
- int i_payload_size; /* sum of all records' sizes */
- msg_Dbg(p_demux, "parsing ty chunk #%d", p_sys->i_cur_chunk );
- /* if we have left-over filler space from the last chunk, get that */
- if (p_sys->i_stuff_cnt > 0) {
- stream_Read( p_demux->s, NULL, p_sys->i_stuff_cnt);
- p_sys->i_stuff_cnt = 0;
- }
- /* read the TY packet header */
- i_readSize = stream_Peek( p_demux->s, &p_peek, 4 );
- p_sys->i_cur_chunk++;
- if ( (i_readSize < 4) || ( U32_AT(&p_peek[ 0 ] ) == 0 ))
- {
- /* EOF */
- p_sys->eof = 1;
- return 0;
- }
- /* check if it's a PART Header */
- if( U32_AT( &p_peek[ 0 ] ) == TIVO_PES_FILEID )
- {
- /* parse master chunk */
- parse_master(p_demux);
- return get_chunk_header(p_demux);
- }
- /* number of records in chunk (8- or 16-bit number) */
- if (p_peek[3] & 0x80)
- {
- /* 16 bit rec cnt */
- p_sys->i_num_recs = i_num_recs = (p_peek[1] << 8) + p_peek[0];
- p_sys->i_seq_rec = (p_peek[3] << 8) + p_peek[2];
- if (p_sys->i_seq_rec != 0xffff)
- {
- p_sys->i_seq_rec &= ~0x8000;
- }
- }
- else
- {
- /* 8 bit reclen - tivo 1.3 format */
- p_sys->i_num_recs = i_num_recs = p_peek[0];
- p_sys->i_seq_rec = p_peek[1];
- }
- p_sys->i_cur_rec = 0;
- p_sys->b_first_chunk = false;
- /*msg_Dbg( p_demux, "chunk has %d records", i_num_recs );*/
- free(p_sys->rec_hdrs);
- /* skip past the 4 bytes we "peeked" earlier */
- stream_Read( p_demux->s, NULL, 4 );
- /* read the record headers into a temp buffer */
- p_hdr_buf = malloc(i_num_recs * 16);
- if (stream_Read(p_demux->s, p_hdr_buf, i_num_recs * 16) < i_num_recs * 16) {
- free( p_hdr_buf );
- p_sys->eof = true;
- return 0;
- }
- /* parse them */
- p_sys->rec_hdrs = parse_chunk_headers(p_hdr_buf, i_num_recs,
- &i_payload_size);
- free(p_hdr_buf);
- p_sys->i_stuff_cnt = CHUNK_SIZE - 4 -
- (p_sys->i_num_recs * 16) - i_payload_size;
- if (p_sys->i_stuff_cnt > 0)
- msg_Dbg( p_demux, "chunk has %d stuff bytes at end",
- p_sys->i_stuff_cnt );
- return 1;
- }
- static ty_rec_hdr_t *parse_chunk_headers( const uint8_t *p_buf,
- int i_num_recs, int *pi_payload_size)
- {
- int i;
- ty_rec_hdr_t *p_hdrs, *p_rec_hdr;
- *pi_payload_size = 0;
- p_hdrs = malloc(i_num_recs * sizeof(ty_rec_hdr_t));
- for (i = 0; i < i_num_recs; i++)
- {
- const uint8_t *record_header = p_buf + (i * 16);
- p_rec_hdr = &p_hdrs[i]; /* for brevity */
- p_rec_hdr->rec_type = record_header[3];
- p_rec_hdr->subrec_type = record_header[2] & 0x0f;
- if ((record_header[ 0 ] & 0x80) == 0x80)
- {
- uint8_t b1, b2;
- /* marker bit 2 set, so read extended data */
- b1 = ( ( ( record_header[ 0 ] & 0x0f ) << 4 ) |
- ( ( record_header[ 1 ] & 0xf0 ) >> 4 ) );
- b2 = ( ( ( record_header[ 1 ] & 0x0f ) << 4 ) |
- ( ( record_header[ 2 ] & 0xf0 ) >> 4 ) );
- p_rec_hdr->ex[0] = b1;
- p_rec_hdr->ex[1] = b2;
- p_rec_hdr->l_rec_size = 0;
- p_rec_hdr->l_ty_pts = 0;
- p_rec_hdr->b_ext = true;
- }
- else
- {
- p_rec_hdr->l_rec_size = ( record_header[ 0 ] << 8 |
- record_header[ 1 ] ) << 4 | ( record_header[ 2 ] >> 4 );
- *pi_payload_size += p_rec_hdr->l_rec_size;
- p_rec_hdr->b_ext = false;
- p_rec_hdr->l_ty_pts = U64_AT( &record_header[ 8 ] );
- }
- //fprintf( stderr, "parse_chunk_headers[%d] t=0x%x s=%dn", i, p_rec_hdr->rec_type, p_rec_hdr->subrec_type );
- } /* end of record-header loop */
- return p_hdrs;
- }