3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.m0k.org/>.
5 It may be used under the terms of the GNU General Public License. */
9 #include "a52dec/a52.h"
13 #define min(a, b) a < b ? a : b
16 hb_stream_type_unknown = 0,
17 hb_stream_type_transport,
18 hb_stream_type_program
21 #define kMaxNumberVideoPIDS 1
22 #define kMaxNumberAudioPIDS 15
23 #define kMaxNumberDecodeStreams (kMaxNumberVideoPIDS+kMaxNumberAudioPIDS)
24 #define kMaxNumberPMTStreams 32
29 int frames; /* video frames so far */
30 int errors; /* total errors so far */
31 int last_error_frame; /* frame # at last error message */
32 int last_error_count; /* # errors at last error message */
34 int64_t ts_lastpcr; /* the last pcr we found in the TS stream */
35 int64_t ts_nextpcr; /* the next pcr to put in a PS packet */
37 uint8_t *ts_buf[kMaxNumberDecodeStreams];
38 int ts_pos[kMaxNumberDecodeStreams];
39 int8_t ts_foundfirst[kMaxNumberDecodeStreams];
40 int8_t ts_skipbad[kMaxNumberDecodeStreams];
41 int8_t ts_streamcont[kMaxNumberDecodeStreams];
42 int8_t ts_start[kMaxNumberDecodeStreams];
44 uint8_t *fwrite_buf; /* PS buffer (set by hb_ts_stream_decode) */
45 uint8_t *fwrite_buf_orig; /* PS buffer start (set by hb_ts_stream_decode) */
48 * Stuff before this point is dynamic state updated as we read the
49 * stream. Stuff after this point is stream description state that
50 * we learn during the initial scan but cache so it can be
51 * reused during the conversion read.
53 int16_t ts_video_pids[kMaxNumberVideoPIDS];
54 int16_t ts_audio_pids[kMaxNumberAudioPIDS];
56 uint8_t ts_number_video_pids;
57 uint8_t ts_number_audio_pids;
59 uint8_t ts_streamid[kMaxNumberDecodeStreams];
60 uint8_t ts_audio_stream_type[kMaxNumberDecodeStreams];
64 hb_stream_type_t stream_type;
72 } a52_info[kMaxNumberAudioPIDS];
76 unsigned short program_number;
77 unsigned short program_map_PID;
78 } pat_info[kMaxNumberPMTStreams];
79 int ts_number_pat_entries;
84 unsigned char *tablebuf;
85 unsigned int tablepos;
86 unsigned char current_continuity_counter;
91 int program_info_length;
92 unsigned char *progam_info_descriptor_data;
95 unsigned char stream_type;
96 unsigned short elementary_PID;
97 unsigned short ES_info_length;
98 unsigned char *es_info_descriptor_data;
99 } pmt_stream_info[kMaxNumberPMTStreams];
103 /***********************************************************************
105 **********************************************************************/
106 static void hb_stream_duration(hb_stream_t *stream, hb_title_t *inTitle);
107 static void hb_ts_stream_init(hb_stream_t *stream);
108 static void hb_ts_stream_find_pids(hb_stream_t *stream);
109 static int hb_ts_stream_decode(hb_stream_t *stream, uint8_t *obuf);
110 static void hb_ts_stream_reset(hb_stream_t *stream);
111 static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream,
113 static void hb_ps_stream_find_audio_ids(hb_stream_t *stream, hb_title_t *title);
114 static off_t align_to_next_packet(FILE* f);
117 * streams have a bunch of state that's learned during the scan. We don't
118 * want to throw away the state when scan does a close then relearn
119 * everything when reader does an open. So we save the stream state on
120 * the close following a scan and reuse it when 'reader' does an open.
122 static hb_list_t *stream_state_list;
124 static hb_stream_t *hb_stream_lookup( const char *path )
126 if ( stream_state_list == NULL )
132 while ( ( ss = hb_list_item( stream_state_list, i++ ) ) != NULL )
134 if ( strcmp( path, ss->path ) == 0 )
142 static void hb_stream_state_delete( hb_stream_t *ss )
144 hb_list_rem( stream_state_list, ss );
149 static inline int check_ps_sync(const uint8_t *buf)
151 // a legal MPEG program stream must start with a Pack header in the
153 return (buf[0] == 0x00) && (buf[1] == 0x00) &&
154 (buf[2] == 0x01) && (buf[3] == 0xba);
157 static inline int check_ts_sync(const uint8_t *buf)
159 // must have initial sync byte, no scrambling & a legal adaptation ctrl
160 return (buf[0] == 0x47) && ((buf[3] >> 6) == 0) && ((buf[3] >> 4) > 0);
163 static inline int have_ts_sync(const uint8_t *buf)
165 return check_ts_sync(&buf[0*188]) && check_ts_sync(&buf[1*188]) &&
166 check_ts_sync(&buf[2*188]) && check_ts_sync(&buf[3*188]) &&
167 check_ts_sync(&buf[4*188]) && check_ts_sync(&buf[5*188]) &&
168 check_ts_sync(&buf[6*188]) && check_ts_sync(&buf[7*188]);
171 static int hb_stream_check_for_ts(const uint8_t *buf)
173 // transport streams should have a sync byte every 188 bytes.
174 // search the first KB of buf looking for at least 8 consecutive
175 // correctly located sync patterns.
178 for ( offset = 0; offset < 1024; ++offset )
180 if ( have_ts_sync( &buf[offset]) )
186 static int hb_stream_check_for_ps(const uint8_t *buf)
188 // program streams should have a Pack header every 2048 bytes.
189 // check that we have 4 of these.
190 return check_ps_sync(&buf[0*2048]) && check_ps_sync(&buf[1*2048]) &&
191 check_ps_sync(&buf[2*2048]) && check_ps_sync(&buf[3*2048]);
194 static int hb_stream_get_type(hb_stream_t *stream)
198 if ( fread(buf, 1, sizeof(buf), stream->file_handle) == sizeof(buf) )
200 if ( hb_stream_check_for_ts(buf) != 0 )
202 hb_log("file is MPEG Transport Stream");
203 stream->stream_type = hb_stream_type_transport;
204 hb_ts_stream_init(stream);
207 if ( hb_stream_check_for_ps(buf) != 0 )
209 hb_log("file is MPEG Program Stream");
210 stream->stream_type = hb_stream_type_program;
217 static void hb_stream_delete_dynamic( hb_stream_t *d )
221 fclose( d->file_handle );
222 d->file_handle = NULL;
227 for (i = 0; i < kMaxNumberDecodeStreams; i++)
237 static void hb_stream_delete( hb_stream_t *d )
239 hb_stream_delete_dynamic( d );
244 /***********************************************************************
246 ***********************************************************************
248 **********************************************************************/
249 hb_stream_t * hb_stream_open( char *path, int opentype )
252 FILE *f = fopen( path, "r" );
255 hb_log( "hb_stream_open: open %s failed", path );
259 hb_stream_t *d = calloc( sizeof( hb_stream_t ), 1 );
263 hb_log( "hb_stream_open: can't allocate space for %s stream state", path );
268 * if we're opening the stream to read & convert, we need
269 * the state we saved when we scanned the stream. if we're
270 * opening the stream to scan it we want to rebuild the state
271 * (even if we have saved state, the stream may have changed).
273 hb_stream_t *ss = hb_stream_lookup( path );
276 /* opening to read - we must have saved state */
279 hb_log( "hb_stream_open: error: re-opening %s but no scan state", path );
285 * copy the saved state since we might be encoding the same stream
288 memcpy( d, ss, sizeof(*d) );
290 d->opentype = opentype;
291 d->path = strdup( path );
293 if ( d->stream_type == hb_stream_type_transport )
296 for ( ; i < d->ts_number_video_pids + d->ts_number_audio_pids; i++)
298 d->ts_buf[i] = malloc( HB_DVD_READ_BUFFER_SIZE );
300 hb_stream_seek( d, 0. );
306 * opening for scan - delete any saved state then (re)scan the stream.
307 * If it's something we can deal with (MPEG2 PS or TS) return a stream
308 * reference structure & null otherwise.
313 hb_stream_state_delete( ss );
316 d->opentype = opentype;
317 d->path = strdup( path );
318 if (d->path != NULL && hb_stream_get_type( d ) != 0 )
322 fclose( d->file_handle );
327 hb_log( "hb_stream_open: open %s failed", path );
332 /***********************************************************************
334 ***********************************************************************
335 * Closes and frees everything
336 **********************************************************************/
337 void hb_stream_close( hb_stream_t ** _d )
339 hb_stream_t *stream = * _d;
340 if ( stream->frames )
342 hb_log( "stream: %d good frames, %d errors (%.0f%%)", stream->frames,
343 stream->errors, (double)stream->errors * 100. /
344 (double)stream->frames );
347 * if the stream was opened for a scan, cache the result, otherwise delete
350 if ( stream->opentype == 0 )
352 hb_stream_delete_dynamic( stream );
353 if ( stream_state_list == NULL )
355 stream_state_list = hb_list_init();
357 hb_list_add( stream_state_list, stream );
361 hb_stream_delete( stream );
366 /* when the file was first opened we made entries for all the audio elementary
367 * streams we found in it. Streams that were later found during the preview scan
368 * now have an audio codec, type, rate, etc., associated with them. At the end
369 * of the scan we delete all the audio entries that weren't found by the scan
370 * or don't have a format we support. This routine deletes audio entry 'indx'
371 * by copying all later entries down one slot. */
372 static void hb_stream_delete_audio_entry(hb_stream_t *stream, int indx)
376 for (i = indx+1; i < stream->ts_number_audio_pids; ++i)
378 stream->ts_audio_pids[indx] = stream->ts_audio_pids[i];
379 stream->ts_audio_stream_type[1 + indx] = stream->ts_audio_stream_type[1+i];
380 stream->ts_streamid[1 + indx] = stream->ts_streamid[1 + i];
383 --stream->ts_number_audio_pids;
386 static int index_of_pid(int pid, hb_stream_t *stream)
390 if ( pid == stream->ts_video_pids[0] )
393 for ( i = 0; i < stream->ts_number_audio_pids; ++i )
394 if ( pid == stream->ts_audio_pids[i] )
400 /***********************************************************************
401 * hb_ps_stream_title_scan
402 ***********************************************************************
404 **********************************************************************/
405 hb_title_t * hb_stream_title_scan(hb_stream_t *stream)
408 hb_title_t *aTitle = hb_title_init( stream->path, 0 );
411 // Copy part of the stream path to the title name
412 char *sep = strrchr(stream->path, '/');
414 strcpy(aTitle->name, sep+1);
415 char *dot_term = strrchr(aTitle->name, '.');
419 // Height, width, rate and aspect ratio information is filled in when the previews are built
421 hb_stream_duration(stream, aTitle);
424 hb_chapter_t * chapter;
425 chapter = calloc( sizeof( hb_chapter_t ), 1 );
427 chapter->duration = aTitle->duration;
428 chapter->hours = aTitle->hours;
429 chapter->minutes = aTitle->minutes;
430 chapter->seconds = aTitle->seconds;
431 hb_list_add( aTitle->list_chapter, chapter );
433 // Figure out how many audio streams we really have:
434 // - For transport streams, for each PID listed in the PMT (whether
435 // or not it was an audio stream type) read the bitstream until we
436 // find an packet from that PID containing a PES header and see if
437 // the elementary stream is an audio type.
438 // - For program streams read the first 4MB and take every unique
439 // audio stream we find.
440 if (stream->stream_type == hb_stream_type_transport)
444 for (i=0; i < stream->ts_number_audio_pids; i++)
446 hb_audio_t *audio = hb_ts_stream_set_audio_id_and_codec(stream, i);
447 if (audio->config.in.codec)
448 hb_list_add( aTitle->list_audio, audio );
452 hb_stream_delete_audio_entry(stream, i);
457 // add the PCR PID if we don't already have it
458 if ( index_of_pid( stream->pmt_info.PCR_PID, stream ) < 0 )
460 stream->ts_audio_pids[stream->ts_number_audio_pids++] =
461 stream->pmt_info.PCR_PID;
466 hb_ps_stream_find_audio_ids(stream, aTitle);
473 * scan the next MB of 'stream' to find the next start packet for
474 * the Packetized Elementary Stream associated with TS PID 'pid'.
476 static const uint8_t *hb_ts_stream_getPEStype(hb_stream_t *stream, uint32_t pid)
478 static uint8_t buf[188];
479 int npack = 100000; // max packets to read
483 if (fread(buf, 1, 188, stream->file_handle) != 188)
485 hb_log("hb_ts_stream_getPEStype: EOF while searching for PID 0x%x", pid);
490 hb_log("hb_ts_stream_getPEStype: lost sync while searching for PID 0x%x", pid);
491 align_to_next_packet(stream->file_handle);
496 * The PES header is only in TS packets with 'start' set so we check
497 * that first then check for the right PID.
499 if ((buf[1] & 0x40) == 0 || (buf[1] & 0x1f) != (pid >> 8) ||
500 buf[2] != (pid & 0xff))
502 // not a start packet or not the pid we want
506 /* skip over the TS hdr to return a pointer to the PES hdr */
508 switch (buf[3] & 0x30)
510 case 0x00: // illegal
511 case 0x20: // fill packet
514 case 0x30: // adaptation
517 hb_log("hb_ts_stream_getPEStype: invalid adaptation field length %d for PID 0x%x", buf[4], pid);
530 static uint64_t hb_ps_stream_getVideoPTS(hb_stream_t *stream)
532 hb_buffer_t *buf = hb_buffer_init(HB_DVD_READ_BUFFER_SIZE);
533 hb_list_t *list = hb_list_init();
534 // how many blocks we read while searching for a video PES header
538 while (--blksleft >= 0 && hb_stream_read(stream, buf) == 1)
542 // 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams
543 hb_demux_ps(buf, list);
545 while ( ( es = hb_list_item( list, 0 ) ) )
547 hb_list_rem( list, es );
548 if ( es->id == 0xe0 )
550 // this PES contains video - if there's a PTS we're done
551 // hb_demux_ps left the PTS in buf_es->start.
552 if ( es->start != ~0 )
559 hb_buffer_close( &es );
562 hb_list_empty( &list );
563 hb_buffer_close(&buf);
567 /***********************************************************************
569 ***********************************************************************
571 * Finding stream duration is difficult. One issue is that the video file
572 * may have chunks from several different program fragments (main feature,
573 * commercials, station id, trailers, etc.) all with their own base pts
574 * value. We can't find the piece boundaries without reading the entire
575 * file but if we compute a rate based on time stamps from two different
576 * pieces the result will be meaningless. The second issue is that the
577 * data rate of compressed video normally varies by 5-10x over the length
578 * of the video. This says that we want to compute the rate over relatively
579 * long segments to get a representative average but long segments increase
580 * the likelihood that we'll cross a piece boundary.
582 * What we do is take time stamp samples at several places in the file
583 * (currently 16) then compute the average rate (i.e., ticks of video per
584 * byte of the file) for all pairs of samples (N^2 rates computed for N
585 * samples). Some of those rates will be absurd because the samples came
586 * from different segments. Some will be way low or high because the
587 * samples came from a low or high motion part of the segment. But given
588 * that we're comparing *all* pairs the majority of the computed rates
589 * should be near the overall average. So we median filter the computed
590 * rates to pick the most representative value.
592 **********************************************************************/
594 uint64_t pos; /* file position of this PTS sample */
595 uint64_t pts; /* PTS from video stream */
598 #define NDURSAMPLES 16
600 // get one (position, timestamp) sampple from a transport or program
602 static struct pts_pos hb_sample_pts(hb_stream_t *stream, uint64_t fpos)
604 struct pts_pos pp = { 0, 0 };
606 if ( stream->stream_type == hb_stream_type_program )
608 // round address down to nearest dvd sector start
609 fpos &=~ ( HB_DVD_READ_BUFFER_SIZE - 1 );
610 fseeko( stream->file_handle, fpos, SEEK_SET );
611 pp.pts = hb_ps_stream_getVideoPTS( stream );
616 fseeko( stream->file_handle, fpos, SEEK_SET );
617 align_to_next_packet( stream->file_handle );
618 buf = hb_ts_stream_getPEStype( stream, stream->ts_video_pids[0] );
621 hb_log("hb_sample_pts: couldn't find video packet near %llu", fpos);
624 if ( ( buf[7] >> 7 ) != 1 )
626 hb_log("hb_sample_pts: no PTS in video packet near %llu", fpos);
629 pp.pts = ( ( (uint64_t)buf[9] >> 1 ) & 7 << 30 ) |
630 ( (uint64_t)buf[10] << 22 ) |
631 ( ( (uint64_t)buf[11] >> 1 ) << 15 ) |
632 ( (uint64_t)buf[12] << 7 ) |
633 ( (uint64_t)buf[13] >> 1 );
635 pp.pos = ftello(stream->file_handle);
636 hb_log("hb_sample_pts: pts %lld at %llu", pp.pts, pp.pos );
640 static int dur_compare( const void *a, const void *b )
642 const double *aval = a, *bval = b;
643 return ( *aval < *bval ? -1 : ( *aval == *bval ? 0 : 1 ) );
646 // given an array of (position, time) samples, compute a max-likelihood
647 // estimate of the average rate by computing the rate between all pairs
648 // of samples then taking the median of those rates.
649 static double compute_stream_rate( struct pts_pos *pp, int n )
652 double rates[NDURSAMPLES * NDURSAMPLES / 2];
655 // the following nested loops compute the rates between all pairs.
657 for ( i = 0; i < n-1; ++i )
659 // Bias the median filter by not including pairs that are "far"
660 // from one another. This is to handle cases where the file is
661 // made of roughly equal size pieces where a symmetric choice of
662 // pairs results in having the same number of intra-piece &
663 // inter-piece rate estimates. This would mean that the median
664 // could easily fall in the inter-piece part of the data which
665 // would give a bogus estimate. The 'ns' index creates an
666 // asymmetry that favors locality.
667 int ns = i + ( n >> 1 );
670 for ( j = i+1; j < ns; ++j )
672 if ( pp[j].pts != pp[i].pts && pp[j].pos > pp[i].pos )
674 *rp = ((double)( pp[j].pts - pp[i].pts )) /
675 ((double)( pp[j].pos - pp[i].pos ));
680 // now compute and return the median of all the (n*n/2) rates we computed
682 int nrates = rp - rates;
683 qsort( rates, nrates, sizeof (rates[0] ), dur_compare );
684 return rates[nrates >> 1];
687 static void hb_stream_duration(hb_stream_t *stream, hb_title_t *inTitle)
689 struct pts_pos ptspos[NDURSAMPLES];
690 struct pts_pos *pp = ptspos;
693 fseeko(stream->file_handle, 0, SEEK_END);
694 uint64_t fsize = ftello(stream->file_handle);
695 uint64_t fincr = fsize / NDURSAMPLES;
696 uint64_t fpos = fincr / 2;
697 for ( i = NDURSAMPLES; --i >= 0; fpos += fincr )
699 *pp++ = hb_sample_pts(stream, fpos);
701 uint64_t dur = compute_stream_rate( ptspos, pp - ptspos ) * (double)fsize;
702 inTitle->duration = dur;
704 inTitle->hours = dur / 3600;
705 inTitle->minutes = ( dur % 3600 ) / 60;
706 inTitle->seconds = dur % 60;
708 rewind(stream->file_handle);
711 /***********************************************************************
713 ***********************************************************************
715 **********************************************************************/
716 int hb_stream_read( hb_stream_t * src_stream, hb_buffer_t * b )
718 if ( src_stream->stream_type == hb_stream_type_program )
720 size_t amt_read = fread(b->data, HB_DVD_READ_BUFFER_SIZE, 1,
721 src_stream->file_handle);
722 return (amt_read > 0);
724 return hb_ts_stream_decode( src_stream, b->data );
727 /***********************************************************************
729 ***********************************************************************
731 **********************************************************************/
732 int hb_stream_seek( hb_stream_t * src_stream, float f )
734 off_t stream_size, cur_pos, new_pos;
735 double pos_ratio = f;
736 cur_pos = ftello(src_stream->file_handle);
737 fseeko(src_stream->file_handle,0 ,SEEK_END);
738 stream_size = ftello(src_stream->file_handle);
739 new_pos = (off_t) ((double) (stream_size) * pos_ratio);
740 new_pos &=~ (HB_DVD_READ_BUFFER_SIZE - 1);
741 int r = fseeko(src_stream->file_handle, new_pos, SEEK_SET);
745 fseeko(src_stream->file_handle, cur_pos, SEEK_SET);
749 if (src_stream->stream_type == hb_stream_type_transport)
751 // We need to drop the current decoder output and move
752 // forwards to the next transport stream packet.
753 hb_ts_stream_reset(src_stream);
759 static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream,
762 off_t cur_pos = ftello(stream->file_handle);
763 hb_audio_t *audio = calloc( sizeof( hb_audio_t ), 1 );
766 fseeko(stream->file_handle, 0, SEEK_SET);
767 align_to_next_packet(stream->file_handle);
768 buf = hb_ts_stream_getPEStype(stream, stream->ts_audio_pids[aud_pid_index]);
770 /* check that we found a PES header */
771 if (buf && buf[0] == 0x00 && buf[1] == 0x00 && buf[2] == 0x01)
775 audio->id = 0x80bd | (aud_pid_index << 8);
776 audio->config.in.codec = HB_ACODEC_AC3;
777 hb_log("transport stream pid 0x%x (type 0x%x) is AC-3 audio id 0x%x",
778 stream->ts_audio_pids[aud_pid_index],
779 stream->ts_audio_stream_type[1 + aud_pid_index],
781 stream->ts_audio_stream_type[1 + aud_pid_index] = 0x81;
782 stream->ts_streamid[1 + aud_pid_index] = buf[3];
784 else if ((buf[3] & 0xe0) == 0xc0)
786 audio->id = buf[3] | aud_pid_index;
787 audio->config.in.codec = HB_ACODEC_MPGA;
788 hb_log("transport stream pid 0x%x (type 0x%x) is MPEG audio id 0x%x",
789 stream->ts_audio_pids[aud_pid_index],
790 stream->ts_audio_stream_type[1 + aud_pid_index],
792 stream->ts_audio_stream_type[1 + aud_pid_index] = 0x03;
793 stream->ts_streamid[1 + aud_pid_index] = buf[3];
796 fseeko(stream->file_handle, cur_pos, SEEK_SET);
797 if (! audio->config.in.codec)
799 hb_log("transport stream pid 0x%x (type 0x%x) isn't audio",
800 stream->ts_audio_pids[aud_pid_index],
801 stream->ts_audio_stream_type[1 + aud_pid_index]);
806 static void add_audio_to_title(hb_title_t *title, int id)
808 hb_audio_t *audio = calloc( sizeof( hb_audio_t ), 1 );
814 audio->config.in.codec = HB_ACODEC_MPGA;
815 hb_log("add_audio_to_title: added MPEG audio stream 0x%x", id);
818 // type 2 is a DVD subtitle stream - just ignore it */
822 audio->config.in.codec = HB_ACODEC_AC3;
823 hb_log("add_audio_to_title: added AC3 audio stream 0x%x", id);
826 audio->config.in.codec = HB_ACODEC_LPCM;
827 hb_log("add_audio_to_title: added LPCM audio stream 0x%x", id);
830 hb_log("add_audio_to_title: unknown audio stream type 0x%x", id);
835 hb_list_add( title->list_audio, audio );
838 static void hb_ps_stream_find_audio_ids(hb_stream_t *stream, hb_title_t *title)
840 off_t cur_pos = ftello(stream->file_handle);
841 hb_buffer_t *buf = hb_buffer_init(HB_DVD_READ_BUFFER_SIZE);
842 hb_list_t *list = hb_list_init();
843 // how many blocks we read while searching for audio streams
845 // there can be at most 16 unique streams in an MPEG PS (8 in a DVD)
846 // so we use a bitmap to keep track of the ones we've already seen.
847 // Bit 'i' of smap is set if we've already added the audio for
848 // audio substream id 'i' to the title's audio list.
851 // start looking 20% into the file since there's occasionally no
852 // audio at the beginning (particularly for vobs).
853 hb_stream_seek(stream, 0.2f);
855 while (--blksleft >= 0 && hb_stream_read(stream, buf) == 1)
859 // 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams
860 hb_demux_ps(buf, list);
862 while ( ( es = hb_list_item( list, 0 ) ) )
864 hb_list_rem( list, es );
865 if ( (es->id & 0xff) == 0xbd || (es->id & 0xe0) == 0xc0 )
867 // this PES contains some kind of audio - get the substream id
868 // and check if we've seen it already.
869 int ssid = (es->id > 0xff ? es->id >> 8 : es->id) & 0xf;
870 if ( (smap & (1 << ssid)) == 0 )
872 // we haven't seen this stream before - add it to the
873 // title's list of audio streams.
875 add_audio_to_title(title, es->id);
878 hb_buffer_close( &es );
881 hb_list_empty( &list );
882 hb_buffer_close(&buf);
883 fseeko(stream->file_handle, cur_pos, SEEK_SET);
886 /***********************************************************************
887 * hb_stream_update_audio
888 ***********************************************************************
890 **********************************************************************/
891 void hb_stream_update_audio(hb_stream_t *stream, hb_audio_t *audio)
895 if (stream->stream_type == hb_stream_type_transport)
897 // Find the audio stream info for this PID. The stream index is
898 // the subchannel id which is in the bottom four bits for MPEG audio
899 // and the bottom four bits of the upper byte for everything else.
900 int i = ( audio->id >= 0xd0 ? audio->id >> 8 : audio->id ) & 0xf;
901 if (i >= stream->ts_number_audio_pids)
903 hb_log("hb_stream_update_audio: no PID for audio stream 0x%x",
907 if (audio->id < 0xd0)
909 /* XXX fake mpeg audio sample rate & bps */
910 stream->a52_info[i].flags = A52_STEREO;
911 stream->a52_info[i].rate = 48000 /*Hz*/;
912 stream->a52_info[i].bitrate = 384000 /*Bps*/;
915 lang = lang_for_code(stream->a52_info[i].lang_code);
916 if (!audio->config.in.samplerate)
917 audio->config.in.samplerate = stream->a52_info[i].rate;
918 if (!audio->config.in.bitrate)
919 audio->config.in.bitrate = stream->a52_info[i].bitrate;
920 if (!audio->priv.config.a52.ac3flags)
921 audio->priv.config.a52.ac3flags = audio->config.flags.ac3 = stream->a52_info[i].flags;
926 // XXX should try to get language code from the AC3 bitstream
927 lang = lang_for_code(0x0000);
930 if (!audio->config.in.channel_layout)
932 switch( audio->config.flags.ac3 & A52_CHANNEL_MASK )
938 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_MONO;
943 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
945 /* dolby (DPL1 aka Dolby Surround = 4.0 matrix-encoded) input */
947 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_DOLBY;
951 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_3F2R;
955 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_3F1R;
959 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_3F;
962 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_2F1R;
965 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_2F2R;
969 audio->config.in.channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
972 /* add in our own LFE flag if the source has LFE */
973 if (audio->config.flags.ac3 & A52_LFE)
975 audio->config.in.channel_layout = audio->config.in.channel_layout | HB_INPUT_CH_LAYOUT_HAS_LFE;
979 snprintf( audio->config.lang.description, sizeof( audio->config.lang.description ), "%s (%s)", strlen(lang->native_name) ? lang->native_name : lang->eng_name,
980 audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" : ( audio->config.in.codec == HB_ACODEC_MPGA ? "MPEG" : ( audio->config.in.codec == HB_ACODEC_DCA ? "DTS" : "LPCM" ) ) );
981 snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s", strlen(lang->native_name) ? lang->native_name : lang->eng_name );
982 snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ), "%s", lang->iso639_2);
984 if ( (audio->config.flags.ac3 & A52_CHANNEL_MASK) == A52_DOLBY ) {
985 sprintf( audio->config.lang.description + strlen( audio->config.lang.description ),
986 " (Dolby Surround)" );
988 sprintf( audio->config.lang.description + strlen( audio->config.lang.description ),
990 HB_INPUT_CH_LAYOUT_GET_DISCRETE_FRONT_COUNT(audio->config.in.channel_layout) +
991 HB_INPUT_CH_LAYOUT_GET_DISCRETE_REAR_COUNT(audio->config.in.channel_layout),
992 HB_INPUT_CH_LAYOUT_GET_DISCRETE_LFE_COUNT(audio->config.in.channel_layout));
995 hb_log( "stream: audio %x: lang %s, rate %d, bitrate %d, "
996 "flags = 0x%x", audio->id, audio->config.lang.description, audio->config.in.samplerate,
997 audio->config.in.bitrate, audio->config.flags.ac3 );
1001 /***********************************************************************
1003 ***********************************************************************
1005 **********************************************************************/
1007 static void hb_ts_stream_init(hb_stream_t *stream)
1011 for (i=0; i < kMaxNumberDecodeStreams; i++)
1013 stream->ts_streamcont[i] = -1;
1015 stream->ts_video_pids[0] = -1;
1016 for ( i = 0; i < stream->ts_number_audio_pids; i++ )
1018 stream-> ts_audio_pids[i] = -1;
1021 // Find the audio and video pids in the stream
1022 hb_ts_stream_find_pids(stream);
1024 stream->ts_streamid[0] = 0xE0; // stream 0 must be video
1026 for (i = 0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
1028 // demuxing buffer for TS to PS conversion
1029 stream->ts_buf[i] = malloc( HB_DVD_READ_BUFFER_SIZE );
1033 // ------------------------------------------------------------------------------------
1035 static off_t align_to_next_packet(FILE* f)
1037 unsigned char buf[188*20];
1039 off_t start = ftello(f);
1042 if (fread(buf, 188*20, 1, f) == 1)
1045 while (!found && (pos < 188))
1049 for (i = 0; i < 188*20; i += 188)
1051 unsigned char c = buf[pos+i];
1053 if ((c != 0x47) && (c != 0x72) && (c != 0x29))
1055 // this offset failed, try next
1065 pos = 0; // failed to find anything!!!!!?
1067 fseeko(f, start+pos, SEEK_SET);
1079 static const unsigned int bitmask[] = {
1080 0x0,0x1,0x3,0x7,0xf,0x1f,0x3f,0x7f,0xff,
1081 0x1ff,0x3ff,0x7ff,0xfff,0x1fff,0x3fff,0x7fff,0xffff,
1082 0x1ffff,0x3ffff,0x7ffff,0xfffff,0x1fffff,0x3fffff,0x7fffff,0xffffff,
1083 0x1ffffff,0x3ffffff,0x7ffffff,0xfffffff,0x1fffffff,0x3fffffff,0x7fffffff,0xffffffff};
1085 static inline void set_buf(bitbuf_t *bb, uint8_t* buf, int bufsize, int clear)
1089 bb->val = (bb->buf[0] << 24) | (bb->buf[1] << 16) |
1090 (bb->buf[2] << 8) | bb->buf[3];
1092 memset(bb->buf, 0, bufsize);
1095 static inline int buf_size(bitbuf_t *bb)
1097 return bb->pos >> 3;
1100 static inline unsigned int get_bits(bitbuf_t *bb, int bits)
1103 int left = 32 - (bb->pos & 31);
1107 val = (bb->val >> (left - bits)) & bitmask[bits];
1112 val = (bb->val & bitmask[left]) << (bits - left);
1116 int pos = bb->pos >> 3;
1117 bb->val = (bb->buf[pos] << 24) | (bb->buf[pos + 1] << 16) | (bb->buf[pos + 2] << 8) | bb->buf[pos + 3];
1121 val |= (bb->val >> (32 - bits)) & bitmask[bits];
1129 // extract what useful information we can from the elementary stream
1130 // descriptor list at 'dp' and add it to the stream at 'esindx'.
1131 // Descriptors with info we don't currently use are ignored.
1132 // The descriptor list & descriptor item formats are defined in
1133 // ISO 13818-1 (2000E) section 2.6 (pg. 62).
1134 static void decode_element_descriptors(hb_stream_t* stream, int esindx,
1135 const uint8_t *dp, uint8_t dlen)
1137 const uint8_t *ep = dp + dlen;
1143 case 10: // ISO_639_language descriptor
1144 stream->a52_info[esindx].lang_code = lang_to_code(lang_for_code2((const char *)&dp[2]));
1154 int decode_program_map(hb_stream_t* stream)
1157 set_buf(&bb, stream->pmt_info.tablebuf, stream->pmt_info.tablepos, 0);
1159 get_bits(&bb, 8); // table_id
1161 unsigned int section_length = get_bits(&bb, 12);
1162 stream->pmt_info.section_length = section_length;
1164 unsigned int program_number = get_bits(&bb, 16);
1165 stream->pmt_info.program_number = program_number;
1167 get_bits(&bb, 5); // version_number
1169 get_bits(&bb, 8); // section_number
1170 get_bits(&bb, 8); // last_section_number
1172 unsigned int PCR_PID = get_bits(&bb, 13);
1173 stream->pmt_info.PCR_PID = PCR_PID;
1175 unsigned int program_info_length = get_bits(&bb, 12);
1176 stream->pmt_info.program_info_length = program_info_length;
1179 unsigned char *descriptor_buf = (unsigned char *) malloc(program_info_length);
1180 for (i = 0; i < program_info_length; i++)
1182 descriptor_buf[i] = get_bits(&bb, 8);
1185 int cur_pos = 9 /* data after the section length field*/ + program_info_length;
1186 int done_reading_stream_types = 0;
1187 while (!done_reading_stream_types)
1189 unsigned char stream_type = get_bits(&bb, 8);
1191 unsigned int elementary_PID = get_bits(&bb, 13);
1193 unsigned int ES_info_length = get_bits(&bb, 12);
1196 unsigned char *ES_info_buf = (unsigned char *) malloc(ES_info_length);
1197 for (i=0; i < ES_info_length; i++)
1199 ES_info_buf[i] = get_bits(&bb, 8);
1202 if (stream_type == 0x02)
1204 if (stream->ts_number_video_pids <= kMaxNumberVideoPIDS)
1205 stream->ts_number_video_pids++;
1206 stream->ts_video_pids[stream->ts_number_video_pids-1] = elementary_PID;
1210 // Defined audio stream types are 0x81 for AC-3/A52 audio and 0x03
1211 // for mpeg audio. But content producers seem to use other
1212 // values (0x04 and 0x06 have both been observed) so at this point
1213 // we say everything that isn't a video pid is audio then at the end
1214 // of hb_stream_title_scan we'll figure out which are really audio
1215 // by looking at the PES headers.
1216 i = stream->ts_number_audio_pids;
1217 if (i < kMaxNumberAudioPIDS)
1218 stream->ts_number_audio_pids++;
1219 stream->ts_audio_pids[i] = elementary_PID;
1220 stream->ts_audio_stream_type[1 + i] = stream_type;
1222 if (ES_info_length > 0)
1224 decode_element_descriptors(stream, i, ES_info_buf, ES_info_length);
1228 cur_pos += 5 /* stream header */ + ES_info_length;
1232 if (cur_pos >= section_length - 4 /* stop before the CRC */)
1233 done_reading_stream_types = 1;
1236 free(descriptor_buf);
1240 // ------------------------------------------------------------------------------------
1242 int build_program_map(unsigned char *buf, hb_stream_t *stream)
1244 // Get adaption header info
1246 int adaption = (buf[3] & 0x30) >> 4;
1249 else if (adaption == 0x2)
1251 else if (adaption == 0x3)
1252 adapt_len = buf[4] + 1;
1253 if (adapt_len > 184)
1256 // Get payload start indicator
1258 start = (buf[1] & 0x40) != 0;
1260 // Get pointer length - only valid in packets with a start flag
1261 int pointer_len = 0;
1262 if (start && stream->pmt_info.reading)
1264 // We just finished a bunch of packets - parse the program map details
1266 if (stream->pmt_info.tablebuf[0] == 0x02)
1267 decode_ok = decode_program_map(stream);
1268 free(stream->pmt_info.tablebuf);
1269 stream->pmt_info.tablebuf = NULL;
1270 stream->pmt_info.tablepos = 0;
1271 stream->pmt_info.reading = 0;
1278 pointer_len = buf[4 + adapt_len] + 1;
1279 stream->pmt_info.tablepos = 0;
1281 // Get Continuity Counter
1282 int continuity_counter = buf[3] & 0x0f;
1283 if (!start && (stream->pmt_info.current_continuity_counter + 1 != continuity_counter))
1285 hb_log("build_program_map - Continuity Counter %d out of sequence - expected %d", continuity_counter, stream->pmt_info.current_continuity_counter+1);
1288 stream->pmt_info.current_continuity_counter = continuity_counter;
1289 stream->pmt_info.reading |= start;
1291 // Add the payload for this packet to the current buffer
1292 int amount_to_copy = 184 - adapt_len - pointer_len;
1293 if (stream->pmt_info.reading && (amount_to_copy > 0))
1295 stream->pmt_info.tablebuf = realloc(stream->pmt_info.tablebuf, stream->pmt_info.tablepos + amount_to_copy);
1297 memcpy(stream->pmt_info.tablebuf + stream->pmt_info.tablepos, buf + 4 + adapt_len + pointer_len, amount_to_copy);
1298 stream->pmt_info.tablepos += amount_to_copy;
1304 int decode_PAT(unsigned char *buf, hb_stream_t *stream)
1306 unsigned char tablebuf[1024];
1307 unsigned int tablepos = 0;
1312 // Get adaption header info
1314 int adaption = (buf[3] & 0x30) >> 4;
1317 else if (adaption == 0x2)
1319 else if (adaption == 0x3)
1320 adapt_len = buf[4] + 1;
1321 if (adapt_len > 184)
1324 // Get pointer length
1325 int pointer_len = buf[4 + adapt_len] + 1;
1327 // Get payload start indicator
1329 start = (buf[1] & 0x40) != 0;
1334 // Add the payload for this packet to the current buffer
1335 if (reading && (184 - adapt_len) > 0)
1337 if (tablepos + 184 - adapt_len - pointer_len > 1024)
1339 hb_log("decode_PAT - Bad program section length (> 1024)");
1342 memcpy(tablebuf + tablepos, buf + 4 + adapt_len + pointer_len, 184 - adapt_len - pointer_len);
1343 tablepos += 184 - adapt_len - pointer_len;
1346 if (start && reading)
1348 memcpy(tablebuf + tablepos, buf + 4 + adapt_len + 1, pointer_len - 1);
1351 unsigned int pos = 0;
1352 //while (pos < tablepos)
1355 set_buf(&bb, tablebuf + pos, tablepos - pos, 0);
1357 unsigned char section_id = get_bits(&bb, 8);
1359 unsigned int section_len = get_bits(&bb, 12);
1360 get_bits(&bb, 16); // transport_id
1362 get_bits(&bb, 5); // version_num
1363 get_bits(&bb, 1); // current_next
1364 get_bits(&bb, 8); // section_num
1365 get_bits(&bb, 8); // last_section
1371 // Program Association Section
1372 section_len -= 5; // Already read transport stream ID, version num, section num, and last section num
1373 section_len -= 4; // Ignore the CRC
1375 stream->ts_number_pat_entries = 0;
1376 while ((curr_pos < section_len) && (stream->ts_number_pat_entries < kMaxNumberPMTStreams))
1378 unsigned int pkt_program_num = get_bits(&bb, 16);
1379 stream->pat_info[stream->ts_number_pat_entries].program_number = pkt_program_num;
1381 get_bits(&bb, 3); // Reserved
1382 if (pkt_program_num == 0)
1384 get_bits(&bb, 13); // pkt_network_id
1388 unsigned int pkt_program_map_PID = get_bits(&bb, 13);
1389 stream->pat_info[stream->ts_number_pat_entries].program_map_PID = pkt_program_map_PID;
1392 stream->ts_number_pat_entries++;
1406 pos += 3 + section_len;
1414 static void hb_ts_stream_find_pids(hb_stream_t *stream)
1416 unsigned char buf[188];
1418 // align to first packet
1419 align_to_next_packet(stream->file_handle);
1421 // Read the Transport Stream Packets (188 bytes each) looking at first for PID 0 (the PAT PID), then decode that
1422 // to find the program map PID and then decode that to get the list of audio and video PIDs
1424 int bytesReadInPacket = 0;
1427 // Try to read packet..
1429 if ((bytesRead = fread(buf+bytesReadInPacket, 1, 188-bytesReadInPacket, stream->file_handle)) != 188-bytesReadInPacket)
1433 bytesReadInPacket += bytesRead;
1435 hb_log("hb_ts_stream_find_pids - end of file");
1440 bytesReadInPacket = 0;
1444 if ((buf[0] != 0x47) && (buf[0] != 0x72) && (buf[0] != 0x29))
1446 off_t pos = ftello(stream->file_handle) - 188;
1447 off_t pos2 = align_to_next_packet(stream->file_handle);
1450 hb_log( "hb_ts_stream_find_pids: eof while re-establishing sync @ %lld",
1454 hb_log("hb_ts_stream_decode: sync lost @%lld, regained after %lld bytes",
1460 int pid = (((buf[1] & 0x1F) << 8) | buf[2]) & 0x1FFF;
1462 if ((pid == 0x0000) && (stream->ts_number_pat_entries == 0))
1464 decode_PAT(buf, stream);
1469 for (pat_index = 0; pat_index < stream->ts_number_pat_entries; pat_index++)
1471 // There are some streams where the PAT table has multiple entries as if their are
1472 // multiple programs in the same transport stream, and yet there's actually only one
1473 // program really in the stream. This seems to be true for transport streams that
1474 // originate in the HDHomeRun but have been output by EyeTV's export utility. What I think
1475 // is happening is that the HDHomeRun is sending the entire transport stream as broadcast,
1476 // but the EyeTV is only recording a single (selected) program number and not rewriting the
1477 // PAT info on export to match what's actually on the stream.
1478 // Until we have a way of handling multiple programs per transport stream elegantly we'll match
1479 // on the first pat entry for which we find a matching program map PID. The ideal solution would
1480 // be to build a title choice popup from the PAT program number details and then select from
1481 // their - but right now the API's not capable of that.
1482 if (pid == stream->pat_info[pat_index].program_map_PID)
1484 if (build_program_map(buf, stream) > 0)
1488 // Keep going until we have a complete set of PIDs
1489 if ((stream->ts_number_video_pids > 0) && (stream->ts_number_audio_pids > 0))
1493 hb_log("hb_ts_stream_find_pids - found the following PIDS");
1494 hb_log(" Video PIDS : ");
1496 for (i=0; i < stream->ts_number_video_pids; i++)
1498 hb_log(" 0x%x (%d)", stream->ts_video_pids[i], stream->ts_video_pids[i]);
1500 hb_log(" Audio PIDS : ");
1501 for (i = 0; i < stream->ts_number_audio_pids; i++)
1503 hb_log(" 0x%x (%d)", stream->ts_audio_pids[i], stream->ts_audio_pids[i]);
1508 static void fwrite64( hb_stream_t *stream, void *buf, int size )
1510 if ( (stream->fwrite_buf - stream->fwrite_buf_orig) + size > 2048 )
1512 hb_log( "steam fwrite64 buffer overflow - writing %d with %d already",
1513 size, stream->fwrite_buf - stream->fwrite_buf_orig );
1516 memcpy( stream->fwrite_buf, buf, size );
1517 stream->fwrite_buf += size;
1520 static void write_pack(hb_stream_t* stream, uint64_t time, int stuffing)
1524 buf[0] = 0x00; // pack id
1529 buf[4] = 0x44 | // SCR
1530 ( ( ( time >> 30 ) & 7 ) << 3 ) |
1531 ( ( time >> 28 ) & 3 );
1532 buf[5] = time >> 20;
1534 ( ( ( time >> 15 ) & 0x1f ) << 3 ) |
1535 ( ( time >> 13 ) & 3 );
1537 buf[8] = 0x04 | ( time << 3 );
1539 buf[9] = 0x01; // SCR extension
1541 buf[10] = 384000 >> (22 - 8); // program mux rate
1542 buf[11] = (uint8_t)( 384000 >> (22 - 16) );
1543 buf[12] = (uint8_t)( 384000 << 2 ) | 0x03;
1545 buf[13] = 0xf8 | stuffing;
1548 for (i = 0; i < stuffing; ++i )
1551 fwrite64(stream, buf, 14 + stuffing );
1554 static void pad_buffer(hb_stream_t* stream, int pad)
1566 fwrite64(stream, buf, 6);
1569 while ( --pad >= 0 )
1571 fwrite64(stream, buf, 1);
1575 static void make_pes_header(hb_stream_t* stream, int len, uint8_t streamid)
1579 memset(buf, 0, sizeof(buf) );
1582 buf[4] = ( len + 3 ) >> 8;
1586 fwrite64(stream, buf, 9);
1589 static void generate_output_data(hb_stream_t *stream, int curstream)
1591 uint8_t *tdat = stream->ts_buf[curstream];
1594 // we always ship a PACK header plus all the data in our demux buf.
1595 // AC3 audio also always needs it substream header.
1596 len = 14 + stream->ts_pos[curstream];
1597 if ( stream->ts_audio_stream_type[curstream] == 0x81)
1602 if ( ! stream->ts_start[curstream] )
1604 // we're in the middle of a chunk of PES data - we need to add
1605 // a 'continuation' PES header after the PACK header.
1609 // Write out pack header
1610 // If we don't have 2048 bytes we need to pad to 2048. We can
1611 // add a padding frame after our data but we need at least 7
1612 // bytes of space to do it (6 bytes of header & 1 of pad). If
1613 // we have fewer than 7 bytes left we need to fill the excess
1614 // space with stuffing bytes added to the pack header.
1616 if ( len > HB_DVD_READ_BUFFER_SIZE )
1618 hb_log( "stream ts length botch %d", len );
1620 if ( HB_DVD_READ_BUFFER_SIZE - len < 8)
1622 stuffing = HB_DVD_READ_BUFFER_SIZE - len;
1624 write_pack(stream, stream->ts_nextpcr, stuffing );
1625 stream->ts_nextpcr += 10;
1627 if ( stream->ts_start[curstream] )
1629 // Start frames already have a PES header but we have modify it
1630 // to map from TS PID to PS stream id. Also, if the stream is AC3
1631 // audio we have to insert an AC3 stream header between the end of
1632 // the PES header and the start of the stream data.
1634 stream->ts_start[curstream] = 0;
1635 tdat[3] = stream->ts_streamid[curstream];
1637 uint16_t plen = stream->ts_pos[curstream] - 6;
1638 if ( stream->ts_audio_stream_type[curstream] == 0x81)
1640 // We have to add an AC3 header in front of the data. Add its
1641 // size to the PES packet length.
1643 tdat[4] = plen >> 8;
1646 // Write out the PES header
1647 int hdrsize = 9 + tdat[8];
1648 fwrite64(stream, tdat, hdrsize);
1650 // add a four byte DVD ac3 stream header
1651 uint8_t ac3_substream_id[4];
1652 int ssid = (curstream - stream->ts_number_video_pids) & 0xf;
1653 ac3_substream_id[0] = 0x80 | ssid; // substream id
1654 ac3_substream_id[1] = 0x01; // number of sync words
1655 ac3_substream_id[2] = 0x00; // first offset (16 bits)
1656 ac3_substream_id[3] = 0x02;
1657 fwrite64(stream, ac3_substream_id, 4);
1659 // add the rest of the data
1660 fwrite64(stream, tdat + hdrsize, stream->ts_pos[curstream] - hdrsize);
1664 // not audio - don't need to modify the stream so write what we've got
1665 tdat[4] = plen >> 8;
1667 fwrite64( stream, tdat, stream->ts_pos[curstream] );
1672 // data without a PES start header needs a simple 'continuation'
1673 // PES header. AC3 audio also needs its substream header.
1674 if ( stream->ts_audio_stream_type[curstream] != 0x81)
1676 make_pes_header(stream, stream->ts_pos[curstream],
1677 stream->ts_streamid[curstream]);
1681 make_pes_header(stream, stream->ts_pos[curstream] + 4,
1682 stream->ts_streamid[curstream]);
1684 // add a four byte DVD ac3 stream header
1685 uint8_t ac3_substream_id[4];
1686 int ssid = (curstream - stream->ts_number_video_pids) & 0xf;
1687 ac3_substream_id[0] = 0x80 | ssid; // substream id
1688 ac3_substream_id[1] = 0x01; // number of sync words
1689 ac3_substream_id[2] = 0x00; // first offset (16 bits)
1690 ac3_substream_id[3] = 0x02;
1691 fwrite64(stream, ac3_substream_id, 4);
1693 fwrite64( stream, tdat, stream->ts_pos[curstream] );
1697 int left = HB_DVD_READ_BUFFER_SIZE - len;
1700 pad_buffer(stream, left);
1703 stream->ts_pos[curstream] = 0;
1706 static void ts_warn_helper( hb_stream_t *stream, char *log, va_list args )
1708 // limit error printing to at most one per minute of video (at 30fps)
1710 if ( stream->frames - stream->last_error_frame >= 30*60 )
1714 vsnprintf( msg, sizeof(msg), log, args );
1716 if ( stream->errors - stream->last_error_count < 10 )
1718 hb_log( "stream: error near frame %d: %s", stream->frames, msg );
1722 int Edelta = stream->errors - stream->last_error_count;
1723 double Epcnt = (double)Edelta * 100. /
1724 (stream->frames - stream->last_error_frame);
1725 hb_log( "stream: %d new errors (%.0f%%) up to frame %d: %s",
1726 Edelta, Epcnt, stream->frames, msg );
1728 stream->last_error_frame = stream->frames;
1729 stream->last_error_count = stream->errors;
1733 static void ts_warn( hb_stream_t *stream, char *log, ... )
1736 va_start( args, log );
1737 ts_warn_helper( stream, log, args );
1741 static void ts_err( hb_stream_t *stream, int curstream, char *log, ... )
1744 va_start( args, log );
1745 ts_warn_helper( stream, log, args );
1748 stream->ts_skipbad[curstream] = 1;
1749 stream->ts_pos[curstream] = 0;
1750 stream->ts_streamcont[curstream] = -1;
1753 static int isIframe( const uint8_t *buf, int adapt_len )
1755 // Look for the Group of Pictures packet
1759 for (i = 4 + adapt_len; i < 188; i++)
1761 strid = (strid << 8) | buf[i];
1764 case 0x000001B8: // group_start_code (GOP header)
1765 case 0x000001B3: // sequence_header code
1768 case 0x00000100: // picture_start_code
1769 // picture_header, let's see if it's an I-frame
1772 // check if picture_coding_type == 1
1773 if ((buf[i+2] & (0x7 << 3)) == (1 << 3))
1775 // found an I-frame picture
1782 // didn't find an I frame
1786 /***********************************************************************
1787 * hb_ts_stream_decode
1788 ***********************************************************************
1790 **********************************************************************/
1791 static int hb_ts_stream_decode( hb_stream_t *stream, uint8_t *obuf )
1793 int64_t pcr = stream->ts_lastpcr;
1798 * stash the output buffer pointer in our stream so we don't have to
1799 * pass it & its original value to everything we call.
1801 stream->fwrite_buf = obuf;
1802 stream->fwrite_buf_orig = obuf;
1804 // spin until we get a packet of data from some stream or hit eof
1807 if ((fread(buf, 188, 1, stream->file_handle)) != 1)
1809 // end of file - we didn't finish filling our ps write buffer
1810 // so just discard the remainder (the partial buffer is useless)
1811 hb_log("hb_ts_stream_decode - eof");
1815 /* This next section validates the packet */
1818 if ((buf[0] != 0x47) && (buf[0] != 0x72) && (buf[0] != 0x29))
1820 // lost sync - back up to where we started then try to
1821 // re-establish sync.
1822 off_t pos = ftello(stream->file_handle) - 188;
1823 off_t pos2 = align_to_next_packet(stream->file_handle);
1826 hb_log( "hb_ts_stream_decode: eof while re-establishing sync @ %lld",
1830 ts_warn( stream, "hb_ts_stream_decode: sync lost @%lld, "
1831 "regained after %lld bytes", pos, pos2 );
1835 // Get pid and use it to find stream state.
1836 int pid = ((buf[1] & 0x1F) << 8) | buf[2];
1837 if ( ( curstream = index_of_pid( pid, stream ) ) < 0 )
1841 int errorbit = (buf[1] & 0x80) != 0;
1844 ts_err( stream, curstream, "packet error bit set");
1848 // Get adaption header info
1849 int adaption = (buf[3] & 0x30) >> 4;
1853 ts_err( stream, curstream, "adaptation code 0");
1856 else if (adaption == 0x2)
1858 else if (adaption == 0x3)
1860 adapt_len = buf[4] + 1;
1861 if (adapt_len > 184)
1863 ts_err( stream, curstream, "invalid adapt len %d", adapt_len);
1868 // if there's an adaptation header & PCR_flag is set
1869 // get the PCR (Program Clock Reference)
1870 if ( adapt_len > 7 && ( buf[5] & 0x10 ) != 0 )
1872 pcr = ( (uint64_t)buf[6] << (33 - 8) ) |
1873 ( (uint64_t)buf[7] << (33 - 16) ) |
1874 ( (uint64_t)buf[8] << (33 - 24) ) |
1875 ( (uint64_t)buf[9] << (33 - 32) ) |
1877 stream->ts_nextpcr = pcr;
1879 // remember the pcr across calls to this routine
1880 stream->ts_lastpcr = pcr;
1885 // don't accumulate data until we get a pcr
1890 // Continuity only increments for adaption values of 0x3 or 0x01
1891 // and is not checked for start packets.
1893 int start = (buf[1] & 0x40) != 0;
1895 if ( (adaption & 0x01) != 0 )
1897 int continuity = (buf[3] & 0xF);
1898 if ( continuity == stream->ts_streamcont[curstream] )
1900 // we got a duplicate packet (usually used to introduce
1901 // a PCR when one is needed). The only thing that can
1902 // change in the dup is the PCR which we grabbed above
1903 // so ignore the rest.
1906 if ( !start && (stream->ts_streamcont[curstream] != -1) &&
1907 (continuity != ( (stream->ts_streamcont[curstream] + 1) & 0xf ) ) )
1909 ts_err( stream, curstream, "continuity error: got %d expected %d",
1911 (stream->ts_streamcont[curstream] + 1) & 0xf );
1912 stream->ts_streamcont[curstream] = continuity;
1915 stream->ts_streamcont[curstream] = continuity;
1918 /* If we get here the packet is valid - process its data */
1922 // Found a random access point (now we can start a frame/audio packet..)
1924 // If we were skipping a bad packet, start fresh on this new PES packet..
1925 if (stream->ts_skipbad[curstream] == 1)
1927 // video skips to an iframe after a bad packet to minimize
1928 // screen corruption
1929 if ( curstream == 0 && !isIframe( buf, adapt_len ) )
1933 stream->ts_skipbad[curstream] = 0;
1936 // If we don't have video yet, check to see if this is an
1937 // i_frame (group of picture start)
1938 if ( curstream == 0 )
1940 if ( !stream->ts_foundfirst[0] )
1942 if ( !isIframe( buf, adapt_len ) )
1944 // didn't find an I frame
1947 stream->ts_foundfirst[0] = 1;
1951 else if ( ! stream->ts_foundfirst[curstream] )
1953 // start other streams only after first video frame found.
1954 if ( ! stream->ts_foundfirst[0] )
1958 stream->ts_foundfirst[curstream] = 1;
1961 // If we have some data already on this stream, turn it into
1962 // a program stream packet. Then add the payload for this
1963 // packet to the current pid's buffer.
1964 if ( stream->ts_pos[curstream] )
1966 generate_output_data(stream, curstream);
1967 stream->ts_start[curstream] = 1;
1968 memcpy(stream->ts_buf[curstream],
1969 buf + 4 + adapt_len, 184 - adapt_len);
1970 stream->ts_pos[curstream] = 184 - adapt_len;
1973 stream->ts_start[curstream] = 1;
1976 // Add the payload for this packet to the current buffer
1977 if (!stream->ts_skipbad[curstream] && stream->ts_foundfirst[curstream] &&
1978 (184 - adapt_len) > 0)
1980 memcpy(stream->ts_buf[curstream] + stream->ts_pos[curstream],
1981 buf + 4 + adapt_len, 184 - adapt_len);
1982 stream->ts_pos[curstream] += 184 - adapt_len;
1984 // if the next TS packet could possibly overflow our 2K output buffer
1985 // we need to generate a packet now. Overflow would be 184 bytes of
1986 // data + the 9 byte PES hdr + the 14 byte PACK hdr = 211 bytes.
1987 if ( stream->ts_pos[curstream] >= (HB_DVD_READ_BUFFER_SIZE - 216) )
1989 // we have enough data to make a PS packet
1990 generate_output_data(stream, curstream);
1997 /***********************************************************************
1998 * hb_ts_stream_reset
1999 ***********************************************************************
2001 **********************************************************************/
2002 static void hb_ts_stream_reset(hb_stream_t *stream)
2006 for (i=0; i < kMaxNumberDecodeStreams; i++)
2008 stream->ts_pos[i] = 0;
2009 stream->ts_foundfirst[i] = 0;
2010 stream->ts_skipbad[i] = 0;
2011 stream->ts_streamcont[i] = -1;
2012 stream->ts_start[i] = 0;
2015 stream->ts_lastpcr = -1;
2016 stream->ts_nextpcr = -1;
2020 stream->last_error_frame = -10000;
2021 stream->last_error_count = 0;
2023 align_to_next_packet(stream->file_handle);