3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
14 #include "a52dec/a52.h"
15 #include "mp4v2/mp4v2.h"
17 #define min(a, b) a < b ? a : b
18 #define STR4_TO_UINT32(p) \
19 ((((const uint8_t*)(p))[0] << 24) | \
20 (((const uint8_t*)(p))[1] << 16) | \
21 (((const uint8_t*)(p))[2] << 8) | \
22 ((const uint8_t*)(p))[3])
25 * This table defines how ISO MPEG stream type codes map to HandBrake
26 * codecs. It is indexed by the 8 bit stream type and contains the codec
27 * worker object id and a parameter for that worker proc (ignored except
28 * for the ffmpeg-based codecs in which case it is the ffmpeg codec id).
30 * Entries with a worker proc id of 0 or a kind of 'U' indicate that HB
31 * doesn't handle the stream type.
33 typedef enum { N, U, A, V } kind_t;
35 kind_t kind; /* not handled / unknown / audio / video */
36 int codec; /* HB worker object id of codec */
37 int codec_param; /* param for codec (usually ffmpeg codec id) */
38 const char* name; /* description of type */
41 #define st(id, kind, codec, codec_param, name) \
42 [id] = { kind, codec, codec_param, name }
44 static const stream2codec_t st2codec[256] = {
45 st(0x01, V, WORK_DECMPEG2, 0, "MPEG1"),
46 st(0x02, V, WORK_DECMPEG2, 0, "MPEG2"),
47 st(0x03, A, HB_ACODEC_MPGA, CODEC_ID_MP2, "MPEG1"),
48 st(0x04, A, HB_ACODEC_MPGA, CODEC_ID_MP2, "MPEG2"),
49 st(0x05, N, 0, 0, "ISO 13818-1 private section"),
50 st(0x06, U, 0, 0, "ISO 13818-1 PES private data"),
51 st(0x07, N, 0, 0, "ISO 13522 MHEG"),
52 st(0x08, N, 0, 0, "ISO 13818-1 DSM-CC"),
53 st(0x09, N, 0, 0, "ISO 13818-1 auxiliary"),
54 st(0x0a, N, 0, 0, "ISO 13818-6 encap"),
55 st(0x0b, N, 0, 0, "ISO 13818-6 DSM-CC U-N msgs"),
56 st(0x0c, N, 0, 0, "ISO 13818-6 Stream descriptors"),
57 st(0x0d, N, 0, 0, "ISO 13818-6 Sections"),
58 st(0x0e, N, 0, 0, "ISO 13818-1 auxiliary"),
59 st(0x0f, A, HB_ACODEC_MPGA, CODEC_ID_AAC, "ISO 13818-7 AAC Audio"),
60 st(0x10, V, WORK_DECAVCODECV, CODEC_ID_MPEG4, "MPEG4"),
61 st(0x11, A, HB_ACODEC_MPGA, CODEC_ID_AAC_LATM, "MPEG4 LATM AAC"),
62 st(0x12, U, 0, 0, "MPEG4 generic"),
64 st(0x14, N, 0, 0, "ISO 13818-6 DSM-CC download"),
66 st(0x1b, V, WORK_DECAVCODECV, CODEC_ID_H264, "H.264"),
68 st(0x80, N, HB_ACODEC_MPGA, CODEC_ID_PCM_BLURAY, "DigiCipher II Video"),
69 st(0x81, A, HB_ACODEC_AC3, 0, "AC-3"),
70 st(0x82, A, HB_ACODEC_DCA, 0, "HDMV DTS"),
71 st(0x83, A, HB_ACODEC_LPCM, 0, "LPCM"),
72 st(0x84, A, 0, 0, "SDDS"),
73 st(0x85, U, 0, 0, "ATSC Program ID"),
74 st(0x86, A, HB_ACODEC_DCA, 0, "DTS-HD"),
75 st(0x87, A, 0, 0, "E-AC-3"),
77 st(0x8a, A, HB_ACODEC_DCA, 0, "DTS"),
79 st(0x91, A, HB_ACODEC_AC3, 0, "AC-3"),
80 st(0x92, N, 0, 0, "Subtitle"),
82 st(0x94, A, 0, 0, "SDDS"),
83 st(0xa0, V, 0, 0, "MSCODEC"),
85 st(0xea, V, WORK_DECAVCODECV, CODEC_ID_VC1, "VC1"),
90 hb_stream_type_unknown = 0,
97 #define kMaxNumberVideoPIDS 1
98 #define kMaxNumberAudioPIDS 31
99 #define kMaxNumberDecodeStreams (kMaxNumberVideoPIDS+kMaxNumberAudioPIDS)
100 #define kMaxNumberPMTStreams 32
105 int frames; /* video frames so far */
106 int errors; /* total errors so far */
107 int last_error_frame; /* frame # at last error message */
108 int last_error_count; /* # errors at last error message */
109 int packetsize; /* Transport Stream packet size */
111 uint8_t need_keyframe; // non-zero if want to start at a keyframe
112 uint8_t ts_found_pcr; // non-zero if we've found at least one input pcr
113 int ts_pcr_out; // sequence number of most recent output pcr
114 int ts_pcr_in; // sequence number of most recent input pcr
115 int64_t ts_pcr; // most recent input pcr
116 int64_t ts_pcrhist[4]; // circular buffer of output pcrs
118 uint8_t *ts_packet; /* buffer for one TS packet */
119 hb_buffer_t *ts_buf[kMaxNumberDecodeStreams];
120 int ts_pos[kMaxNumberDecodeStreams];
121 int8_t ts_skipbad[kMaxNumberDecodeStreams];
122 int8_t ts_streamcont[kMaxNumberDecodeStreams];
123 uint8_t ts_pkt_summary[kMaxNumberDecodeStreams][8];
125 hb_buffer_t *fwrite_buf; /* PS buffer (set by hb_ts_stream_decode) */
127 int chapter; /* Chapter that we are currently in */
128 int64_t chapter_end; /* HB time that the current chapter ends */
131 * Stuff before this point is dynamic state updated as we read the
132 * stream. Stuff after this point is stream description state that
133 * we learn during the initial scan but cache so it can be
134 * reused during the conversion read.
136 uint8_t ts_number_video_pids;
137 uint8_t ts_number_audio_pids;
138 uint8_t ts_flags; // stream characteristics:
139 #define TS_HAS_PCR (1 << 0) // at least one PCR seen
140 #define TS_HAS_RAP (1 << 1) // Random Access Point bit seen
141 #define TS_HAS_RSEI (1 << 2) // "Restart point" SEI seen
142 uint8_t ts_IDRs; // # IDRs found during duration scan
144 int16_t ts_video_pids[kMaxNumberVideoPIDS];
145 int16_t ts_audio_pids[kMaxNumberAudioPIDS];
147 uint32_t ts_format_id[kMaxNumberDecodeStreams];
148 #define TS_FORMAT_ID_AC3 (('A' << 24) | ('C' << 16) | ('-' << 8) | '3')
149 uint8_t ts_stream_type[kMaxNumberDecodeStreams];
150 uint8_t ts_multiplexed[kMaxNumberDecodeStreams];
154 hb_stream_type_t hb_stream_type;
157 AVFormatContext *ffmpeg_ic;
158 AVPacket *ffmpeg_pkt;
159 double ffmpeg_tsconv[MAX_STREAMS];
160 uint8_t ffmpeg_video_id;
167 } a52_info[kMaxNumberAudioPIDS];
171 unsigned short program_number;
172 unsigned short program_map_PID;
173 } pat_info[kMaxNumberPMTStreams];
174 int ts_number_pat_entries;
179 unsigned char *tablebuf;
180 unsigned int tablepos;
181 unsigned char current_continuity_counter;
185 unsigned int PCR_PID;
187 int program_info_length;
190 unsigned char stream_type;
191 unsigned short elementary_PID;
192 unsigned short ES_info_length;
193 unsigned char *es_info_descriptor_data;
194 } pmt_stream_info[kMaxNumberPMTStreams];
198 /***********************************************************************
200 **********************************************************************/
201 static void hb_stream_duration(hb_stream_t *stream, hb_title_t *inTitle);
202 static void hb_ts_stream_init(hb_stream_t *stream);
203 static void hb_ts_stream_find_pids(hb_stream_t *stream);
204 static int hb_ts_stream_decode(hb_stream_t *stream, hb_buffer_t *obuf);
205 static void hb_ts_stream_reset(hb_stream_t *stream);
206 static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream,
208 static void hb_ps_stream_find_audio_ids(hb_stream_t *stream, hb_title_t *title);
209 static off_t align_to_next_packet(hb_stream_t *stream);
211 static int ffmpeg_open( hb_stream_t *stream, hb_title_t *title );
212 static void ffmpeg_close( hb_stream_t *d );
213 static hb_title_t *ffmpeg_title_scan( hb_stream_t *stream );
214 static int ffmpeg_read( hb_stream_t *stream, hb_buffer_t *buf );
215 static int ffmpeg_seek( hb_stream_t *stream, float frac );
216 static int ffmpeg_seek_ts( hb_stream_t *stream, int64_t ts );
219 * streams have a bunch of state that's learned during the scan. We don't
220 * want to throw away the state when scan does a close then relearn
221 * everything when reader does an open. So we save the stream state on
222 * the close following a scan and reuse it when 'reader' does an open.
224 static hb_list_t *stream_state_list;
226 static hb_stream_t *hb_stream_lookup( const char *path )
228 if ( stream_state_list == NULL )
234 while ( ( ss = hb_list_item( stream_state_list, i++ ) ) != NULL )
236 if ( strcmp( path, ss->path ) == 0 )
244 static void hb_stream_state_delete( hb_stream_t *ss )
246 hb_list_rem( stream_state_list, ss );
253 * these frontend hb_log because transport streams can have a lot of errors
254 * so we want to rate limit messages. this routine limits the number of
255 * messages to at most one per minute of video. other errors that occur
256 * during the minute are counted & the count is output with the next
257 * error msg we print.
259 static void ts_warn_helper( hb_stream_t *stream, char *log, va_list args )
261 // limit error printing to at most one per minute of video (at 30fps)
263 if ( stream->frames - stream->last_error_frame >= 30*60 )
267 vsnprintf( msg, sizeof(msg), log, args );
269 if ( stream->errors - stream->last_error_count < 10 )
271 hb_log( "stream: error near frame %d: %s", stream->frames, msg );
275 int Edelta = stream->errors - stream->last_error_count;
276 double Epcnt = (double)Edelta * 100. /
277 (stream->frames - stream->last_error_frame);
278 hb_log( "stream: %d new errors (%.0f%%) up to frame %d: %s",
279 Edelta, Epcnt, stream->frames, msg );
281 stream->last_error_frame = stream->frames;
282 stream->last_error_count = stream->errors;
286 static void ts_warn( hb_stream_t*, char*, ... ) HB_WPRINTF(2,3);
287 static void ts_err( hb_stream_t*, int, char*, ... ) HB_WPRINTF(3,4);
289 static void ts_warn( hb_stream_t *stream, char *log, ... )
292 va_start( args, log );
293 ts_warn_helper( stream, log, args );
297 static void ts_err( hb_stream_t *stream, int curstream, char *log, ... )
300 va_start( args, log );
301 ts_warn_helper( stream, log, args );
304 stream->ts_skipbad[curstream] = 1;
305 stream->ts_pos[curstream] = 0;
306 stream->ts_streamcont[curstream] = -1;
309 static int check_ps_sync(const uint8_t *buf)
311 // a legal MPEG program stream must start with a Pack header in the
313 return (buf[0] == 0x00) && (buf[1] == 0x00) &&
314 (buf[2] == 0x01) && (buf[3] == 0xba);
317 static int check_ps_sc(const uint8_t *buf)
319 // a legal MPEG program stream must start with a Pack followed by a
320 // some other start code. If we've already verified the pack, this skip
321 // it and checks for a start code prefix.
322 int pos = 14 + ( buf[13] & 0x7 ); // skip over the PACK
323 return (buf[pos+0] == 0x00) && (buf[pos+1] == 0x00) && (buf[pos+2] == 0x01);
326 static int check_ts_sync(const uint8_t *buf)
328 // must have initial sync byte, no scrambling & a legal adaptation ctrl
329 return (buf[0] == 0x47) && ((buf[3] >> 6) == 0) && ((buf[3] >> 4) > 0);
332 static int have_ts_sync(const uint8_t *buf, int psize)
334 return check_ts_sync(&buf[0*psize]) && check_ts_sync(&buf[1*psize]) &&
335 check_ts_sync(&buf[2*psize]) && check_ts_sync(&buf[3*psize]) &&
336 check_ts_sync(&buf[4*psize]) && check_ts_sync(&buf[5*psize]) &&
337 check_ts_sync(&buf[6*psize]) && check_ts_sync(&buf[7*psize]);
340 static int hb_stream_check_for_ts(const uint8_t *buf)
342 // transport streams should have a sync byte every 188 bytes.
343 // search the first 8KB of buf looking for at least 8 consecutive
344 // correctly located sync patterns.
347 for ( offset = 0; offset < 8*1024-8*188; ++offset )
349 if ( have_ts_sync( &buf[offset], 188) )
350 return 188 | (offset << 8);
351 if ( have_ts_sync( &buf[offset], 192) )
352 return 192 | (offset << 8);
353 if ( have_ts_sync( &buf[offset], 204) )
354 return 204 | (offset << 8);
355 if ( have_ts_sync( &buf[offset], 208) )
356 return 208 | (offset << 8);
361 static int hb_stream_check_for_ps(hb_stream_t *stream)
368 fseek(stream->file_handle, 0, SEEK_SET);
370 // program streams should start with a PACK then some other mpeg start
371 // code (usually a SYS but that might be missing if we only have a clip).
372 while (pos < 512 * 1024)
376 if ( fread(buf, 1, sizeof(buf), stream->file_handle) != sizeof(buf) )
379 for ( offset = 0; offset < 8*1024-27; ++offset )
381 if ( check_ps_sync( &buf[offset] ) && check_ps_sc( &buf[offset] ) )
383 int pes_offset, prev, data_len;
388 pes_offset = 14 + (buf[13] & 0x7);
389 sid = buf[pes_offset+3];
390 data_len = (buf[pes_offset+4] << 8) + buf[pes_offset+5];
391 if ( data_len && sid > 0xba && sid < 0xf9 )
393 prev = ftell( stream->file_handle );
394 pos = pes_offset + 6 + data_len + prev;
395 fseek( stream->file_handle, pos, SEEK_SET );
396 if ( fread(sc_buf, 1, 4, stream->file_handle) != 4 )
398 if (sc_buf[0] == 0x00 && sc_buf[1] == 0x00 &&
403 fseek( stream->file_handle, prev, SEEK_SET );
407 fseek( stream->file_handle, -27, SEEK_CUR );
408 pos = ftell( stream->file_handle );
413 static int hb_stream_check_for_dvd_ps(const uint8_t *buf)
415 // DVD program streams should have a Pack header every 2048 bytes.
416 // check that we have 4 of these in a row.
417 return check_ps_sync(&buf[0*2048]) && check_ps_sync(&buf[1*2048]) &&
418 check_ps_sync(&buf[2*2048]) && check_ps_sync(&buf[3*2048]);
421 static int hb_stream_get_type(hb_stream_t *stream)
425 if ( fread(buf, 1, sizeof(buf), stream->file_handle) == sizeof(buf) )
428 if ( ( psize = hb_stream_check_for_ts(buf) ) != 0 )
430 int offset = psize >> 8;
432 hb_log("file is MPEG Transport Stream with %d byte packets"
433 " offset %d bytes", psize, offset);
434 stream->packetsize = psize;
435 stream->hb_stream_type = transport;
436 hb_ts_stream_init(stream);
437 if ( !stream->ts_number_video_pids || !stream->ts_number_audio_pids )
443 if ( hb_stream_check_for_dvd_ps(buf) != 0 )
445 hb_log("file is MPEG DVD Program Stream");
446 stream->hb_stream_type = dvd_program;
449 if ( hb_stream_check_for_ps(stream) != 0 )
451 hb_log("file is MPEG Program Stream");
452 stream->hb_stream_type = program;
459 static void hb_stream_delete_dynamic( hb_stream_t *d )
463 fclose( d->file_handle );
464 d->file_handle = NULL;
471 free( d->ts_packet );
474 for (i = 0; i < kMaxNumberDecodeStreams; i++)
478 hb_buffer_close(&(d->ts_buf[i]));
484 static void hb_stream_delete( hb_stream_t *d )
486 hb_stream_delete_dynamic( d );
491 static int audio_inactive( hb_stream_t *stream, int indx )
493 int aud_indx = indx - 1;
495 if ( stream->ts_audio_pids[aud_indx] < 0 )
497 // PID declared inactive by hb_stream_title_scan
500 if ( stream->ts_audio_pids[aud_indx] == stream->pmt_info.PCR_PID )
502 // PCR PID is always active
506 // see if we should make the stream inactive because scan.c didn't
507 // find a valid audio bitstream.
509 for ( i = 0; i < hb_list_count( stream->title->list_audio ); ++i )
511 hb_audio_t *audio = hb_list_item( stream->title->list_audio, i );
512 if ( audio->id == indx )
517 // not in the title's audio list - declare the PID inactive
518 stream->ts_audio_pids[aud_indx] = -stream->ts_audio_pids[aud_indx];
522 /***********************************************************************
524 ***********************************************************************
526 **********************************************************************/
527 hb_stream_t * hb_stream_open( char *path, hb_title_t *title )
529 FILE *f = fopen( path, "rb" );
532 hb_log( "hb_stream_open: open %s failed", path );
536 hb_stream_t *d = calloc( sizeof( hb_stream_t ), 1 );
540 hb_log( "hb_stream_open: can't allocate space for %s stream state", path );
545 * if we're opening the stream to read & convert, we need
546 * the state we saved when we scanned the stream. if we're
547 * opening the stream to scan it we want to rebuild the state
548 * (even if we have saved state, the stream may have changed).
550 hb_stream_t *ss = hb_stream_lookup( path );
551 if ( title && ss && ss->hb_stream_type != ffmpeg )
554 * copy the saved state since we might be encoding the same stream
557 memcpy( d, ss, sizeof(*d) );
560 d->path = strdup( path );
562 if ( d->hb_stream_type == transport )
564 d->ts_packet = malloc( d->packetsize );
567 for ( ; i < d->ts_number_video_pids + d->ts_number_audio_pids; i++)
569 if ( i && audio_inactive( d, i ) )
571 // this PID isn't wanted (we don't have a codec for it
572 // or scan didn't find audio parameters)
575 d->ts_buf[i] = hb_buffer_init(d->packetsize);
576 d->ts_buf[i]->size = 0;
578 hb_stream_seek( d, 0. );
584 * opening for scan - delete any saved state then (re)scan the stream.
585 * If it's something we can deal with (MPEG2 PS or TS) return a stream
586 * reference structure & null otherwise.
590 hb_stream_state_delete( ss );
594 d->path = strdup( path );
595 if (d->path != NULL )
597 if ( hb_stream_get_type( d ) != 0 )
601 fclose( d->file_handle );
602 d->file_handle = NULL;
603 if ( ffmpeg_open( d, title ) )
608 if ( d->file_handle )
610 fclose( d->file_handle );
616 hb_log( "hb_stream_open: open %s failed", path );
621 /***********************************************************************
623 ***********************************************************************
624 * Closes and frees everything
625 **********************************************************************/
626 void hb_stream_close( hb_stream_t ** _d )
628 hb_stream_t *stream = * _d;
630 if ( stream->hb_stream_type == ffmpeg )
632 ffmpeg_close( stream );
633 hb_stream_delete( stream );
638 if ( stream->frames )
640 hb_log( "stream: %d good frames, %d errors (%.0f%%)", stream->frames,
641 stream->errors, (double)stream->errors * 100. /
642 (double)stream->frames );
646 * if the stream was opened for a scan, cache the result, otherwise delete
649 if ( stream->title == NULL )
651 hb_stream_delete_dynamic( stream );
652 if ( stream_state_list == NULL )
654 stream_state_list = hb_list_init();
656 hb_list_add( stream_state_list, stream );
660 hb_stream_delete( stream );
665 /* when the file was first opened we made entries for all the audio elementary
666 * streams we found in it. Streams that were later found during the preview scan
667 * now have an audio codec, type, rate, etc., associated with them. At the end
668 * of the scan we delete all the audio entries that weren't found by the scan
669 * or don't have a format we support. This routine deletes audio entry 'indx'
670 * by setting its PID to an invalid value so no packet will match it. (We can't
671 * move any of the entries since the index of the entry is used as the id
672 * of the media stream for HB. */
673 static void hb_stream_delete_audio_entry(hb_stream_t *stream, int indx)
675 if ( stream->ts_audio_pids[indx] > 0 )
677 stream->ts_audio_pids[indx] = -stream->ts_audio_pids[indx];
681 static int index_of_pid(int pid, hb_stream_t *stream)
685 if ( pid == stream->ts_video_pids[0] )
688 for ( i = 0; i < stream->ts_number_audio_pids; ++i )
689 if ( pid == stream->ts_audio_pids[i] )
695 /***********************************************************************
696 * hb_ps_stream_title_scan
697 ***********************************************************************
699 **********************************************************************/
700 hb_title_t * hb_stream_title_scan(hb_stream_t *stream)
702 if ( stream->hb_stream_type == ffmpeg )
703 return ffmpeg_title_scan( stream );
706 hb_title_t *aTitle = hb_title_init( stream->path, 0 );
707 aTitle->type = HB_STREAM_TYPE;
710 // Copy part of the stream path to the title name
711 char *sep = strrchr(stream->path, '/');
713 strcpy(aTitle->name, sep+1);
714 char *dot_term = strrchr(aTitle->name, '.');
718 // Height, width, rate and aspect ratio information is filled in when the previews are built
720 hb_stream_duration(stream, aTitle);
723 hb_chapter_t * chapter;
724 chapter = calloc( sizeof( hb_chapter_t ), 1 );
726 chapter->duration = aTitle->duration;
727 chapter->hours = aTitle->hours;
728 chapter->minutes = aTitle->minutes;
729 chapter->seconds = aTitle->seconds;
730 hb_list_add( aTitle->list_chapter, chapter );
732 // Figure out how many audio streams we really have:
733 // - For transport streams, for each PID listed in the PMT (whether
734 // or not it was an audio stream type) read the bitstream until we
735 // find an packet from that PID containing a PES header and see if
736 // the elementary stream is an audio type.
737 // - For program streams read the first 4MB and take every unique
738 // audio stream we find.
739 if (stream->hb_stream_type == transport)
743 for (i=0; i < stream->ts_number_audio_pids; i++)
745 hb_audio_t *audio = hb_ts_stream_set_audio_id_and_codec(stream, i);
746 if (audio->config.in.codec)
747 hb_list_add( aTitle->list_audio, audio );
751 hb_stream_delete_audio_entry(stream, i);
755 // make sure we're grabbing the PCR PID
756 if ( index_of_pid( stream->pmt_info.PCR_PID, stream ) < 0 )
758 stream->ts_audio_pids[stream->ts_number_audio_pids++] =
759 stream->pmt_info.PCR_PID;
762 // set the video id, codec & muxer
763 aTitle->video_id = 0;
764 aTitle->video_codec = st2codec[stream->ts_stream_type[0]].codec;
765 aTitle->video_codec_param = st2codec[stream->ts_stream_type[0]].codec_param;
766 aTitle->demuxer = HB_MPEG2_TS_DEMUXER;
768 if ( ( stream->ts_flags & TS_HAS_PCR ) == 0 )
770 hb_log( "transport stream missing PCRs - using video DTS instead" );
773 if ( stream->ts_IDRs < 1 )
775 hb_log( "transport stream doesn't seem to have video IDR frames" );
776 aTitle->flags |= HBTF_NO_IDR;
781 hb_ps_stream_find_audio_ids(stream, aTitle);
788 * read the next transport stream packet from 'stream'. Return NULL if
789 * we hit eof & a pointer to the sync byte otherwise.
791 static const uint8_t *next_packet( hb_stream_t *stream )
793 uint8_t *buf = stream->ts_packet + stream->packetsize - 188;
797 if ( fread(stream->ts_packet, 1, stream->packetsize, stream->file_handle) !=
806 // lost sync - back up to where we started then try to re-establish.
807 off_t pos = ftello(stream->file_handle) - stream->packetsize;
808 off_t pos2 = align_to_next_packet(stream);
811 hb_log( "next_packet: eof while re-establishing sync @ %"PRId64, pos );
814 ts_warn( stream, "next_packet: sync lost @ %"PRId64", regained after %"PRId64" bytes",
820 * skip to the start of the next PACK header in program stream src_stream.
822 static void skip_to_next_pack( hb_stream_t *src_stream )
824 // scan forward until we find the start of the next pack
825 uint32_t strt_code = -1;
828 flockfile( src_stream->file_handle );
829 while ( ( c = getc_unlocked( src_stream->file_handle ) ) != EOF )
831 strt_code = ( strt_code << 8 ) | c;
832 if ( strt_code == 0x000001ba )
833 // we found the start of the next pack
836 funlockfile( src_stream->file_handle );
838 // if we didn't terminate on an eof back up so the next read
839 // starts on the pack boundary.
842 fseeko( src_stream->file_handle, -4, SEEK_CUR );
846 static int isIframe( hb_stream_t *stream, const uint8_t *buf, int adapt_len )
848 // For mpeg2: look for a gop start or i-frame picture start
849 // for h.264: look for idr nal type or a slice header for an i-frame
850 // for vc1: look for a Sequence header
855 if ( stream->ts_stream_type[0] <= 2 )
857 // This section of the code handles MPEG-1 and MPEG-2 video streams
858 for (i = 13 + adapt_len; i < 188; i++)
860 strid = (strid << 8) | buf[i];
861 if ( ( strid >> 8 ) == 1 )
863 // we found a start code
867 case 0xB8: // group_start_code (GOP header)
868 case 0xB3: // sequence_header code
871 case 0x00: // picture_start_code
872 // picture_header, let's see if it's an I-frame
875 // check if picture_coding_type == 1
876 if ((buf[i+2] & (0x7 << 3)) == (1 << 3))
878 // found an I-frame picture
886 // didn't find an I-frame
889 if ( stream->ts_stream_type[0] == 0x1b )
891 // we have an h.264 stream
892 for (i = 13 + adapt_len; i < 188; i++)
894 strid = (strid << 8) | buf[i];
895 if ( ( strid >> 8 ) == 1 )
897 // we found a start code - remove the ref_idc from the nal type
898 uint8_t nal_type = strid & 0x1f;
899 if ( nal_type == 0x05 )
900 // h.264 IDR picture start
904 // didn't find an I-frame
907 if ( stream->ts_stream_type[0] == 0xea )
909 // we have an vc1 stream
910 for (i = 13 + adapt_len; i < 188; i++)
912 strid = (strid << 8) | buf[i];
913 if ( strid == 0x10f )
915 // the ffmpeg vc1 decoder requires a seq hdr code in the first
920 // didn't find an I-frame
924 // we don't understand the stream type so just say "yes" otherwise
925 // we'll discard all the video.
930 * scan the next MB of 'stream' to find the next start packet for
931 * the Packetized Elementary Stream associated with TS PID 'pid'.
933 static const uint8_t *hb_ts_stream_getPEStype(hb_stream_t *stream, uint32_t pid)
935 int npack = 300000; // max packets to read
939 const uint8_t *buf = next_packet( stream );
942 hb_log("hb_ts_stream_getPEStype: EOF while searching for PID 0x%x", pid);
946 // while we're reading the stream, check if it has valid PCRs
947 // and/or random access points.
948 uint32_t pack_pid = ( (buf[1] & 0x1f) << 8 ) | buf[2];
949 if ( pack_pid == stream->pmt_info.PCR_PID )
951 if ( ( buf[5] & 0x10 ) &&
952 ( ( ( buf[3] & 0x30 ) == 0x20 ) ||
953 ( ( buf[3] & 0x30 ) == 0x30 && buf[4] > 6 ) ) )
955 stream->ts_flags |= TS_HAS_PCR;
960 stream->ts_flags |= TS_HAS_RAP;
964 * The PES header is only in TS packets with 'start' set so we check
965 * that first then check for the right PID.
967 if ((buf[1] & 0x40) == 0 || pack_pid != pid )
969 // not a start packet or not the pid we want
973 /* skip over the TS hdr to return a pointer to the PES hdr */
975 switch (buf[3] & 0x30)
977 case 0x00: // illegal
978 case 0x20: // fill packet
981 case 0x30: // adaptation
984 hb_log("hb_ts_stream_getPEStype: invalid adaptation field length %d for PID 0x%x", buf[4], pid);
990 /* PES hdr has to begin with an mpeg start code */
991 if (buf[udata+0] == 0x00 && buf[udata+1] == 0x00 && buf[udata+2] == 0x01)
1001 static uint64_t hb_ps_stream_getVideoPTS(hb_stream_t *stream)
1003 hb_buffer_t *buf = hb_buffer_init(HB_DVD_READ_BUFFER_SIZE);
1004 hb_list_t *list = hb_list_init();
1005 // how many blocks we read while searching for a video PES header
1006 int blksleft = 1024;
1009 while (--blksleft >= 0 && hb_stream_read(stream, buf) == 1)
1013 // 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams
1014 hb_demux_ps( buf, list, 0 );
1016 while ( ( es = hb_list_item( list, 0 ) ) )
1018 hb_list_rem( list, es );
1019 if ( es->id == 0xe0 )
1021 // this PES contains video - if there's a PTS we're done
1022 // hb_demux_ps left the PTS in buf_es->start.
1023 if ( es->start != ~0 )
1030 hb_buffer_close( &es );
1033 hb_list_empty( &list );
1034 hb_buffer_close(&buf);
1038 /***********************************************************************
1039 * hb_stream_duration
1040 ***********************************************************************
1042 * Finding stream duration is difficult. One issue is that the video file
1043 * may have chunks from several different program fragments (main feature,
1044 * commercials, station id, trailers, etc.) all with their own base pts
1045 * value. We can't find the piece boundaries without reading the entire
1046 * file but if we compute a rate based on time stamps from two different
1047 * pieces the result will be meaningless. The second issue is that the
1048 * data rate of compressed video normally varies by 5-10x over the length
1049 * of the video. This says that we want to compute the rate over relatively
1050 * long segments to get a representative average but long segments increase
1051 * the likelihood that we'll cross a piece boundary.
1053 * What we do is take time stamp samples at several places in the file
1054 * (currently 16) then compute the average rate (i.e., ticks of video per
1055 * byte of the file) for all pairs of samples (N^2 rates computed for N
1056 * samples). Some of those rates will be absurd because the samples came
1057 * from different segments. Some will be way low or high because the
1058 * samples came from a low or high motion part of the segment. But given
1059 * that we're comparing *all* pairs the majority of the computed rates
1060 * should be near the overall average. So we median filter the computed
1061 * rates to pick the most representative value.
1063 **********************************************************************/
1065 uint64_t pos; /* file position of this PTS sample */
1066 uint64_t pts; /* PTS from video stream */
1069 #define NDURSAMPLES 128
1071 // get one (position, timestamp) sampple from a transport or program
1073 static struct pts_pos hb_sample_pts(hb_stream_t *stream, uint64_t fpos)
1075 struct pts_pos pp = { 0, 0 };
1077 if ( stream->hb_stream_type == transport )
1080 fseeko( stream->file_handle, fpos, SEEK_SET );
1081 align_to_next_packet( stream );
1082 buf = hb_ts_stream_getPEStype( stream, stream->ts_video_pids[0] );
1085 hb_log("hb_sample_pts: couldn't find video packet near %"PRIu64, fpos);
1088 if ( ( buf[7] >> 7 ) != 1 )
1090 hb_log("hb_sample_pts: no PTS in video packet near %"PRIu64, fpos);
1093 pp.pts = ( ( (uint64_t)buf[9] >> 1 ) & 7 << 30 ) |
1094 ( (uint64_t)buf[10] << 22 ) |
1095 ( ( (uint64_t)buf[11] >> 1 ) << 15 ) |
1096 ( (uint64_t)buf[12] << 7 ) |
1097 ( (uint64_t)buf[13] >> 1 );
1099 if ( isIframe( stream, buf, -4 ) )
1101 if ( stream->ts_IDRs < 255 )
1109 // round address down to nearest dvd sector start
1110 fpos &=~ ( HB_DVD_READ_BUFFER_SIZE - 1 );
1111 fseeko( stream->file_handle, fpos, SEEK_SET );
1112 if ( stream->hb_stream_type == program )
1114 skip_to_next_pack( stream );
1116 pp.pts = hb_ps_stream_getVideoPTS( stream );
1118 pp.pos = ftello(stream->file_handle);
1122 static int dur_compare( const void *a, const void *b )
1124 const double *aval = a, *bval = b;
1125 return ( *aval < *bval ? -1 : ( *aval == *bval ? 0 : 1 ) );
1128 // given an array of (position, time) samples, compute a max-likelihood
1129 // estimate of the average rate by computing the rate between all pairs
1130 // of samples then taking the median of those rates.
1131 static double compute_stream_rate( struct pts_pos *pp, int n )
1134 double rates[NDURSAMPLES * NDURSAMPLES / 8];
1137 // the following nested loops compute the rates between all pairs.
1139 for ( i = 0; i < n-1; ++i )
1141 // Bias the median filter by not including pairs that are "far"
1142 // from one another. This is to handle cases where the file is
1143 // made of roughly equal size pieces where a symmetric choice of
1144 // pairs results in having the same number of intra-piece &
1145 // inter-piece rate estimates. This would mean that the median
1146 // could easily fall in the inter-piece part of the data which
1147 // would give a bogus estimate. The 'ns' index creates an
1148 // asymmetry that favors locality.
1149 int ns = i + ( n >> 3 );
1152 for ( j = i+1; j < ns; ++j )
1154 if ( (uint64_t)(pp[j].pts - pp[i].pts) > 90000LL*3600*6 )
1156 if ( pp[j].pts != pp[i].pts && pp[j].pos > pp[i].pos )
1158 *rp = ((double)( pp[j].pts - pp[i].pts )) /
1159 ((double)( pp[j].pos - pp[i].pos ));
1164 // now compute and return the median of all the (n*n/2) rates we computed
1166 int nrates = rp - rates;
1167 qsort( rates, nrates, sizeof (rates[0] ), dur_compare );
1168 return rates[nrates >> 1];
1171 static void hb_stream_duration(hb_stream_t *stream, hb_title_t *inTitle)
1173 struct pts_pos ptspos[NDURSAMPLES];
1174 struct pts_pos *pp = ptspos;
1177 fseeko(stream->file_handle, 0, SEEK_END);
1178 uint64_t fsize = ftello(stream->file_handle);
1179 uint64_t fincr = fsize / NDURSAMPLES;
1180 uint64_t fpos = fincr / 2;
1181 for ( i = NDURSAMPLES; --i >= 0; fpos += fincr )
1183 *pp++ = hb_sample_pts(stream, fpos);
1185 uint64_t dur = compute_stream_rate( ptspos, pp - ptspos ) * (double)fsize;
1186 inTitle->duration = dur;
1188 inTitle->hours = dur / 3600;
1189 inTitle->minutes = ( dur % 3600 ) / 60;
1190 inTitle->seconds = dur % 60;
1192 rewind(stream->file_handle);
1195 /***********************************************************************
1197 ***********************************************************************
1199 **********************************************************************/
1200 int hb_stream_read( hb_stream_t * src_stream, hb_buffer_t * b )
1202 if ( src_stream->hb_stream_type == ffmpeg )
1204 return ffmpeg_read( src_stream, b );
1206 if ( src_stream->hb_stream_type == dvd_program )
1208 size_t amt_read = fread(b->data, HB_DVD_READ_BUFFER_SIZE, 1,
1209 src_stream->file_handle);
1210 return (amt_read > 0);
1212 if ( src_stream->hb_stream_type == program )
1214 // a general program stream has arbitrary sized pack's. we're
1215 // currently positioned at the start of a pack so read up to but
1216 // not including the start of the next, expanding the buffer
1218 uint8_t *cp = b->data;
1219 uint8_t *ep = cp + b->alloc;
1220 uint32_t strt_code = -1;
1223 // consume the first byte of the initial pack so we don't match on
1224 // it in the loop below.
1225 if ( ( c = getc( src_stream->file_handle ) ) == EOF )
1230 flockfile( src_stream->file_handle );
1231 while ( ( c = getc_unlocked( src_stream->file_handle ) ) != EOF )
1233 strt_code = ( strt_code << 8 ) | c;
1234 if ( strt_code == 0x000001ba )
1235 // we found the start of the next pack
1239 // need to expand the buffer
1240 int curSize = cp - b->data;
1241 hb_buffer_realloc( b, curSize * 2 );
1242 cp = b->data + curSize;
1243 ep = b->data + b->alloc;
1246 // Non-video streams can emulate start codes, so we need
1247 // to inspect PES packets and skip over their data
1248 // sections to avoid mis-detection of the next pack header.
1249 if ( ( strt_code >> 8 ) == 0x000001 &&
1250 ( strt_code & 0xff ) >= 0xbb )
1253 c = getc_unlocked( src_stream->file_handle );
1257 c = getc_unlocked( src_stream->file_handle );
1261 if ( cp+len+2 > ep )
1263 // need to expand the buffer
1264 int curSize = cp - b->data;
1265 if ( curSize * 2 > curSize+len+2 )
1266 hb_buffer_realloc( b, curSize * 2 );
1268 hb_buffer_realloc( b, curSize + len + 2 );
1269 cp = b->data + curSize;
1270 ep = b->data + b->alloc;
1274 fread( cp, 1, len, src_stream->file_handle );
1278 funlockfile( src_stream->file_handle );
1280 // if we didn't terminate on an eof back up so the next read
1281 // starts on the pack boundary.
1282 b->size = cp - b->data;
1285 fseeko( src_stream->file_handle, -4, SEEK_CUR );
1286 // Only 3 of the 4 bytes read were added to the buffer.
1291 return hb_ts_stream_decode( src_stream, b );
1294 int64_t ffmpeg_initial_timestamp( hb_stream_t * stream )
1296 AVStream *s = stream->ffmpeg_ic->streams[stream->ffmpeg_video_id];
1297 if ( s->nb_index_entries < 1 )
1300 return s->index_entries[0].timestamp;
1302 int hb_stream_seek_chapter( hb_stream_t * stream, int chapter_num )
1305 if ( stream->hb_stream_type != ffmpeg )
1307 // currently meaningliess for transport and program streams
1310 if ( !stream || !stream->title ||
1311 chapter_num > hb_list_count( stream->title->list_chapter ) )
1316 int64_t sum_dur = 0;
1317 hb_chapter_t *chapter = NULL;
1319 for ( i = 0; i < chapter_num; ++i)
1321 chapter = hb_list_item( stream->title->list_chapter, i );
1322 sum_dur += chapter->duration;
1324 stream->chapter = chapter_num - 1;
1325 stream->chapter_end = sum_dur;
1327 int64_t pos = ( ( ( sum_dur - chapter->duration ) * AV_TIME_BASE ) / 90000 ) + ffmpeg_initial_timestamp( stream );
1329 hb_deep_log( 2, "Seeking to chapter %d: starts %"PRId64", ends %"PRId64", AV pos %"PRId64,
1330 chapter_num, sum_dur - chapter->duration, sum_dur, pos);
1332 if ( chapter_num > 1 && pos > 0 )
1334 av_seek_frame( stream->ffmpeg_ic, -1, pos, 0);
1338 // ffmpeg has a bug that causes the first PTS after
1339 // av_find_stream_info() is called to be incorrect.
1340 // av_find_stream_info is called whenever opening a file
1341 // with ffmpeg. av_seek_frame clears the condition
1342 // that causes the problem. since hb_stream_seek_chapter
1343 // is called before we start reading, make sure
1344 // we do a seek here.
1345 av_seek_frame( stream->ffmpeg_ic, -1, ffmpeg_initial_timestamp( stream ), AVSEEK_FLAG_BACKWARD );
1350 /***********************************************************************
1352 ***********************************************************************
1353 * Return the number of the chapter that we are currently in. We store
1354 * the chapter number starting from 0, so + 1 for the real chpater num.
1355 **********************************************************************/
1356 int hb_stream_chapter( hb_stream_t * src_stream )
1358 return( src_stream->chapter + 1 );
1361 /***********************************************************************
1363 ***********************************************************************
1365 **********************************************************************/
1366 int hb_stream_seek( hb_stream_t * stream, float f )
1368 if ( stream->hb_stream_type == ffmpeg )
1370 return ffmpeg_seek( stream, f );
1372 off_t stream_size, cur_pos, new_pos;
1373 double pos_ratio = f;
1374 cur_pos = ftello( stream->file_handle );
1375 fseeko( stream->file_handle, 0, SEEK_END );
1376 stream_size = ftello( stream->file_handle );
1377 new_pos = (off_t) ((double) (stream_size) * pos_ratio);
1378 new_pos &=~ (HB_DVD_READ_BUFFER_SIZE - 1);
1380 int r = fseeko( stream->file_handle, new_pos, SEEK_SET );
1383 fseeko( stream->file_handle, cur_pos, SEEK_SET );
1387 if ( stream->hb_stream_type == transport )
1389 // We need to drop the current decoder output and move
1390 // forwards to the next transport stream packet.
1391 hb_ts_stream_reset(stream);
1394 if ( stream->ts_IDRs )
1396 // the stream has IDRs so look for one.
1397 stream->need_keyframe = 1;
1402 // we're at the beginning - say we have video sync so that we
1403 // won't drop initial SPS & PPS data on an AVC stream.
1404 stream->need_keyframe = 0;
1407 else if ( stream->hb_stream_type == program )
1409 skip_to_next_pack( stream );
1415 int hb_stream_seek_ts( hb_stream_t * stream, int64_t ts )
1417 if ( stream->hb_stream_type == ffmpeg )
1419 return ffmpeg_seek_ts( stream, ts );
1424 static const char* make_upper( const char* s )
1426 static char name[8];
1428 char *ep = cp + sizeof(name)-1;
1430 while ( *s && cp < ep )
1432 *cp++ = islower(*s)? toupper(*s) : *s;
1439 static void set_audio_description( hb_audio_t *audio, iso639_lang_t *lang )
1442 * This is a duplicate of code in dvd.c - it should get factored out
1443 * into a common routine. We probably should only be putting the lang
1444 * code or a lang pointer into the audio config & let the common description
1445 * formatting routine in scan.c do all the stuff below.
1447 const char *codec_name;
1450 if ( audio->config.in.codec == HB_ACODEC_FFMPEG &&
1451 ( cc = hb_ffmpeg_context( audio->config.in.codec_param ) ) &&
1452 avcodec_find_decoder( cc->codec_id ) )
1454 codec_name = make_upper( avcodec_find_decoder( cc->codec_id )->name );
1455 if ( !strcmp( codec_name, "LIBFAAD" ) )
1460 else if ( audio->config.in.codec == HB_ACODEC_MPGA &&
1461 avcodec_find_decoder( audio->config.in.codec_param ) )
1463 codec_name = avcodec_find_decoder( audio->config.in.codec_param )->name;
1467 codec_name = audio->config.in.codec == HB_ACODEC_AC3 ? "AC3" :
1468 audio->config.in.codec == HB_ACODEC_DCA ? "DTS" :
1469 audio->config.in.codec == HB_ACODEC_MPGA ? "MPEG" :
1470 audio->config.in.codec == HB_ACODEC_LPCM ? "LPCM" :
1471 audio->config.in.codec == HB_ACODEC_FFMPEG ? "FFMPEG" :
1474 snprintf( audio->config.lang.description,
1475 sizeof( audio->config.lang.description ), "%s (%s)",
1476 strlen(lang->native_name) ? lang->native_name : lang->eng_name,
1479 if (audio->config.in.codec == HB_ACODEC_FFMPEG)
1481 int layout = audio->config.in.channel_layout;
1482 char *desc = audio->config.lang.description +
1483 strlen( audio->config.lang.description );
1484 sprintf( desc, " (%d.%d ch)",
1485 HB_INPUT_CH_LAYOUT_GET_DISCRETE_FRONT_COUNT(layout) +
1486 HB_INPUT_CH_LAYOUT_GET_DISCRETE_REAR_COUNT(layout),
1487 HB_INPUT_CH_LAYOUT_GET_DISCRETE_LFE_COUNT(layout) );
1490 snprintf( audio->config.lang.simple, sizeof( audio->config.lang.simple ), "%s",
1491 strlen(lang->native_name) ? lang->native_name : lang->eng_name );
1492 snprintf( audio->config.lang.iso639_2, sizeof( audio->config.lang.iso639_2 ),
1493 "%s", lang->iso639_2);
1496 static hb_audio_t *hb_ts_stream_set_audio_id_and_codec(hb_stream_t *stream,
1499 off_t cur_pos = ftello(stream->file_handle);
1500 hb_audio_t *audio = calloc( sizeof( hb_audio_t ), 1 );
1503 fseeko(stream->file_handle, 0, SEEK_SET);
1504 align_to_next_packet(stream);
1505 buf = hb_ts_stream_getPEStype(stream, stream->ts_audio_pids[aud_pid_index]);
1507 /* check that we found a PES header */
1511 if (buf && buf[0] == 0x00 && buf[1] == 0x00 && buf[2] == 0x01)
1513 stype = stream->ts_stream_type[1 + aud_pid_index];
1514 kind = st2codec[stype].kind;
1516 // 0xbd ("private stream 1") is the normal container for non-ISO
1517 // media - AC3/DCA/PCM/etc.
1518 if ( buf[3] == 0xbd )
1520 if ( st2codec[stype].kind == U )
1522 // XXX assume unknown stream types are AC-3 (if they're not
1523 // audio we'll find that out during the scan but if they're
1524 // some other type of audio we'll end up ignoring them).
1526 stream->ts_stream_type[1 + aud_pid_index] = 0x81;
1527 kind = st2codec[stype].kind;
1529 if ( stype == 0x80 &&
1530 stream->pmt_info.reg_desc == STR4_TO_UINT32("HDMV") )
1532 // LPCM audio in bluray have an stype of 0x80
1533 // 0x80 is used for other DigiCipher normally
1534 // To distinguish, Bluray streams have a reg_desc of HDMV
1538 else if ( buf[3] == 0xfd )
1540 // 0xfd indicates an extended stream id (ISO 13818-1(2007)).
1541 // the blu ray consortium apparently forgot to read the portion
1542 // of the MPEG spec that says one PID should map to one media
1543 // stream and multiplexed multiple types of audio into one PID
1544 // using the extended stream identifier of the PES header to
1545 // distinguish them. So we have to check if that's happening and
1546 // if so tell the runtime what esid we want.
1547 if ( st2codec[stype].kind == A && stype == 0x83 &&
1548 stream->ts_format_id[1 + aud_pid_index] == TS_FORMAT_ID_AC3 )
1550 // This is an interleaved TrueHD/AC-3 stream and the esid of
1552 stream->ts_multiplexed[1 + aud_pid_index] = 0x76;
1554 stream->ts_stream_type[1 + aud_pid_index] = 0x81;
1555 kind = st2codec[stype].kind;
1557 if ( st2codec[stype].kind == A && stype == 0x86 )
1559 // This is an interleaved DTS-HD/DTS stream and the esid of
1561 stream->ts_multiplexed[1 + aud_pid_index] = 0x71;
1563 stream->ts_stream_type[1 + aud_pid_index] = 0x82;
1564 kind = st2codec[stype].kind;
1567 else if ((buf[3] & 0xe0) == 0xc0)
1569 // 0xC0 - 0xCF are the normal containers for ISO-standard
1570 // media (mpeg2 audio and mpeg4 AAC).
1571 if ( st2codec[stype].kind == U )
1573 // XXX assume unknown stream types are MPEG audio
1575 stream->ts_stream_type[1 + aud_pid_index] = 0x03;
1576 kind = st2codec[stype].kind;
1582 kind = st2codec[stype].kind;
1585 // if we found an audio stream type & HB has a codec that can decode it
1586 // finish configuring the audio so we'll add it to the title's list.
1587 if ( kind == A && st2codec[stype].codec )
1589 audio->id = 1 + aud_pid_index;
1590 audio->config.in.codec = st2codec[stype].codec;
1591 audio->config.in.codec_param = st2codec[stype].codec_param;
1592 set_audio_description( audio,
1593 lang_for_code( stream->a52_info[aud_pid_index].lang_code ) );
1594 hb_log("transport stream pid 0x%x (type 0x%x) may be %s audio (id 0x%x)",
1595 stream->ts_audio_pids[aud_pid_index],
1596 stype, st2codec[stype].name, audio->id);
1602 hb_log("transport stream pid 0x%x (type 0x%x, substream 0x%x) "
1603 "isn't audio", stream->ts_audio_pids[aud_pid_index],
1604 stream->ts_stream_type[1 + aud_pid_index], buf[3]);
1608 hb_log("transport stream pid 0x%x (type 0x%x) isn't audio",
1609 stream->ts_audio_pids[aud_pid_index],
1610 stream->ts_stream_type[1 + aud_pid_index]);
1613 fseeko(stream->file_handle, cur_pos, SEEK_SET);
1617 static void add_audio_to_title(hb_title_t *title, int id)
1619 hb_audio_t *audio = calloc( sizeof( hb_audio_t ), 1 );
1625 audio->config.in.codec = HB_ACODEC_MPGA;
1626 hb_log("add_audio_to_title: added MPEG audio stream 0x%x", id);
1629 // type 2 is a DVD subtitle stream - just ignore it */
1633 audio->config.in.codec = HB_ACODEC_AC3;
1634 hb_log("add_audio_to_title: added AC3 audio stream 0x%x", id);
1637 audio->config.in.codec = HB_ACODEC_LPCM;
1638 hb_log("add_audio_to_title: added LPCM audio stream 0x%x", id);
1641 hb_log("add_audio_to_title: unknown audio stream type 0x%x", id);
1646 set_audio_description( audio, lang_for_code( 0 ) );
1647 hb_list_add( title->list_audio, audio );
1650 static void hb_ps_stream_find_audio_ids(hb_stream_t *stream, hb_title_t *title)
1652 off_t cur_pos = ftello(stream->file_handle);
1653 hb_buffer_t *buf = hb_buffer_init(HB_DVD_READ_BUFFER_SIZE);
1654 hb_list_t *list = hb_list_init();
1655 // how many blocks we read while searching for audio streams
1656 int blksleft = 4096;
1657 // there can be at most 16 unique streams in an MPEG PS (8 in a DVD)
1658 // so we use a bitmap to keep track of the ones we've already seen.
1659 // Bit 'i' of smap is set if we've already added the audio for
1660 // audio substream id 'i' to the title's audio list.
1663 // start looking 20% into the file since there's occasionally no
1664 // audio at the beginning (particularly for vobs).
1665 hb_stream_seek(stream, 0.2f);
1667 while (--blksleft >= 0 && hb_stream_read(stream, buf) == 1)
1671 // 'buf' contains an MPEG2 PACK - get a list of all it's elementary streams
1672 hb_demux_ps( buf, list, 0 );
1674 while ( ( es = hb_list_item( list, 0 ) ) )
1676 hb_list_rem( list, es );
1677 if ( (es->id & 0xff) == 0xbd || (es->id & 0xe0) == 0xc0 )
1679 // this PES contains some kind of audio - get the substream id
1680 // and check if we've seen it already.
1681 int ssid = (es->id > 0xff ? es->id >> 8 : es->id) & 0xf;
1682 if ( (smap & (1 << ssid)) == 0 )
1684 // we haven't seen this stream before - add it to the
1685 // title's list of audio streams.
1686 smap |= (1 << ssid);
1687 add_audio_to_title(title, es->id);
1690 hb_buffer_close( &es );
1693 hb_list_empty( &list );
1694 hb_buffer_close(&buf);
1695 fseeko(stream->file_handle, cur_pos, SEEK_SET);
1698 /***********************************************************************
1700 ***********************************************************************
1702 **********************************************************************/
1704 static void hb_ts_stream_init(hb_stream_t *stream)
1708 for (i=0; i < kMaxNumberDecodeStreams; i++)
1710 stream->ts_streamcont[i] = -1;
1712 stream->ts_video_pids[0] = -1;
1713 for ( i = 0; i < stream->ts_number_audio_pids; i++ )
1715 stream-> ts_audio_pids[i] = -1;
1718 stream->ts_packet = malloc( stream->packetsize );
1720 // Find the audio and video pids in the stream
1721 hb_ts_stream_find_pids(stream);
1723 for (i = 0; i < stream->ts_number_video_pids + stream->ts_number_audio_pids; i++)
1725 // demuxing buffer for TS to PS conversion
1726 stream->ts_buf[i] = hb_buffer_init(stream->packetsize);
1727 stream->ts_buf[i]->size = 0;
1731 #define MAX_HOLE 208*80
1733 static off_t align_to_next_packet(hb_stream_t *stream)
1735 uint8_t buf[MAX_HOLE];
1737 off_t start = ftello(stream->file_handle);
1740 if ( start >= stream->packetsize ) {
1741 start -= stream->packetsize;
1742 fseeko(stream->file_handle, start, SEEK_SET);
1748 if (fread(buf, sizeof(buf), 1, stream->file_handle) == 1)
1750 const uint8_t *bp = buf;
1753 for ( i = sizeof(buf) - 8 * stream->packetsize; --i >= 0; ++bp )
1755 if ( have_ts_sync( bp, stream->packetsize ) )
1762 pos = ( bp - buf ) - stream->packetsize + 188;
1765 fseeko(stream->file_handle, -8 * stream->packetsize, SEEK_CUR);
1766 start = ftello(stream->file_handle);
1773 fseeko(stream->file_handle, start+pos, SEEK_SET);
1774 return start - orig + pos;
1784 static const unsigned int bitmask[] = {
1785 0x0,0x1,0x3,0x7,0xf,0x1f,0x3f,0x7f,0xff,
1786 0x1ff,0x3ff,0x7ff,0xfff,0x1fff,0x3fff,0x7fff,0xffff,
1787 0x1ffff,0x3ffff,0x7ffff,0xfffff,0x1fffff,0x3fffff,0x7fffff,0xffffff,
1788 0x1ffffff,0x3ffffff,0x7ffffff,0xfffffff,0x1fffffff,0x3fffffff,0x7fffffff,0xffffffff};
1790 static inline void set_buf(bitbuf_t *bb, uint8_t* buf, int bufsize, int clear)
1794 bb->val = (bb->buf[0] << 24) | (bb->buf[1] << 16) |
1795 (bb->buf[2] << 8) | bb->buf[3];
1797 memset(bb->buf, 0, bufsize);
1800 static inline int buf_size(bitbuf_t *bb)
1802 return bb->pos >> 3;
1805 static inline unsigned int get_bits(bitbuf_t *bb, int bits)
1808 int left = 32 - (bb->pos & 31);
1812 val = (bb->val >> (left - bits)) & bitmask[bits];
1817 val = (bb->val & bitmask[left]) << (bits - left);
1821 int pos = bb->pos >> 3;
1822 bb->val = (bb->buf[pos] << 24) | (bb->buf[pos + 1] << 16) | (bb->buf[pos + 2] << 8) | bb->buf[pos + 3];
1826 val |= (bb->val >> (32 - bits)) & bitmask[bits];
1834 // extract what useful information we can from the elementary stream
1835 // descriptor list at 'dp' and add it to the stream at 'esindx'.
1836 // Descriptors with info we don't currently use are ignored.
1837 // The descriptor list & descriptor item formats are defined in
1838 // ISO 13818-1 (2000E) section 2.6 (pg. 62).
1839 static void decode_element_descriptors(hb_stream_t* stream, int esindx,
1840 const uint8_t *dp, uint8_t dlen)
1842 const uint8_t *ep = dp + dlen;
1848 case 5: // Registration descriptor
1849 stream->ts_format_id[esindx+1] = (dp[2] << 24) | (dp[3] << 16) |
1850 (dp[4] << 8) | dp[5];
1853 case 10: // ISO_639_language descriptor
1854 stream->a52_info[esindx].lang_code = lang_to_code(lang_for_code2((const char *)&dp[2]));
1857 case 0x6a: // DVB AC-3 descriptor
1858 stream->ts_stream_type[esindx+1] = 0x81;
1868 static const char *stream_type_name (uint8_t stream_type)
1870 return st2codec[stream_type].name? st2codec[stream_type].name : "Unknown";
1873 int decode_program_map(hb_stream_t* stream)
1876 set_buf(&bb, stream->pmt_info.tablebuf, stream->pmt_info.tablepos, 0);
1878 get_bits(&bb, 8); // table_id
1880 unsigned int section_length = get_bits(&bb, 12);
1881 stream->pmt_info.section_length = section_length;
1883 unsigned int program_number = get_bits(&bb, 16);
1884 stream->pmt_info.program_number = program_number;
1886 get_bits(&bb, 5); // version_number
1888 get_bits(&bb, 8); // section_number
1889 get_bits(&bb, 8); // last_section_number
1891 stream->pmt_info.PCR_PID = get_bits(&bb, 13);
1893 int program_info_length = get_bits(&bb, 12);
1894 stream->pmt_info.program_info_length = program_info_length;
1897 for (i = 0; i < program_info_length - 2; )
1900 tag = get_bits(&bb, 8);
1901 len = get_bits(&bb, 8);
1903 if ( i + len > program_info_length )
1907 if (tag == 0x05 && len >= 4)
1909 // registration descriptor
1910 stream->pmt_info.reg_desc = get_bits(&bb, 32);
1915 for ( j = 0; j < len; j++ )
1921 for ( ; i < program_info_length; i++ )
1926 int cur_pos = 9 /* data after the section length field*/ + program_info_length;
1927 int done_reading_stream_types = 0;
1928 while (!done_reading_stream_types)
1930 unsigned char stream_type = get_bits(&bb, 8);
1932 unsigned int elementary_PID = get_bits(&bb, 13);
1934 unsigned int ES_info_length = get_bits(&bb, 12);
1937 unsigned char *ES_info_buf = (unsigned char *) malloc(ES_info_length);
1938 for (i=0; i < ES_info_length; i++)
1940 ES_info_buf[i] = get_bits(&bb, 8);
1944 if ( index_of_pid( elementary_PID, stream ) < 0 )
1946 // don't have this pid yet
1947 if (stream->ts_number_video_pids == 0 &&
1948 st2codec[stream_type].kind == V )
1950 stream->ts_video_pids[0] = elementary_PID;
1951 stream->ts_stream_type[0] = stream_type;
1952 stream->ts_number_video_pids = 1;
1956 // Defined audio stream types are 0x81 for AC-3/A52 audio
1957 // and 0x03 for mpeg audio. But content producers seem to
1958 // use other values (0x04 and 0x06 have both been observed)
1959 // so at this point we say everything that isn't a video
1960 // pid is audio then at the end of hb_stream_title_scan
1961 // we'll figure out which are really audio by looking at
1963 i = stream->ts_number_audio_pids;
1964 if (i < kMaxNumberAudioPIDS)
1966 stream->ts_audio_pids[i] = elementary_PID;
1967 stream->ts_stream_type[1 + i] = stream_type;
1968 if (ES_info_length > 0)
1970 decode_element_descriptors(stream, i, ES_info_buf,
1973 ++stream->ts_number_audio_pids;
1978 cur_pos += 5 /* stream header */ + ES_info_length;
1982 if (cur_pos >= section_length - 4 /* stop before the CRC */)
1983 done_reading_stream_types = 1;
1989 static int build_program_map(const uint8_t *buf, hb_stream_t *stream)
1991 // Get adaption header info
1993 int adaption = (buf[3] & 0x30) >> 4;
1996 else if (adaption == 0x2)
1998 else if (adaption == 0x3)
1999 adapt_len = buf[4] + 1;
2000 if (adapt_len > 184)
2003 // Get payload start indicator
2005 start = (buf[1] & 0x40) != 0;
2007 // Get pointer length - only valid in packets with a start flag
2008 int pointer_len = 0;
2012 pointer_len = buf[4 + adapt_len] + 1;
2013 stream->pmt_info.tablepos = 0;
2015 // Get Continuity Counter
2016 int continuity_counter = buf[3] & 0x0f;
2017 if (!start && (stream->pmt_info.current_continuity_counter + 1 != continuity_counter))
2019 hb_log("build_program_map - Continuity Counter %d out of sequence - expected %d", continuity_counter, stream->pmt_info.current_continuity_counter+1);
2022 stream->pmt_info.current_continuity_counter = continuity_counter;
2023 stream->pmt_info.reading |= start;
2025 // Add the payload for this packet to the current buffer
2026 int amount_to_copy = 184 - adapt_len - pointer_len;
2027 if (stream->pmt_info.reading && (amount_to_copy > 0))
2029 stream->pmt_info.tablebuf = realloc(stream->pmt_info.tablebuf, stream->pmt_info.tablepos + amount_to_copy);
2031 memcpy(stream->pmt_info.tablebuf + stream->pmt_info.tablepos, buf + 4 + adapt_len + pointer_len, amount_to_copy);
2032 stream->pmt_info.tablepos += amount_to_copy;
2034 if (stream->pmt_info.tablepos > 3)
2036 // We have enough to check the section length
2038 length = ((stream->pmt_info.tablebuf[1] << 8) +
2039 stream->pmt_info.tablebuf[2]) & 0xFFF;
2040 if (stream->pmt_info.tablepos > length + 1)
2042 // We just finished a bunch of packets - parse the program map details
2044 if (stream->pmt_info.tablebuf[0] == 0x02)
2045 decode_ok = decode_program_map(stream);
2046 free(stream->pmt_info.tablebuf);
2047 stream->pmt_info.tablebuf = NULL;
2048 stream->pmt_info.tablepos = 0;
2049 stream->pmt_info.reading = 0;
2059 static int decode_PAT(const uint8_t *buf, hb_stream_t *stream)
2061 unsigned char tablebuf[1024];
2062 unsigned int tablepos = 0;
2067 // Get adaption header info
2069 int adaption = (buf[3] & 0x30) >> 4;
2072 else if (adaption == 0x2)
2074 else if (adaption == 0x3)
2075 adapt_len = buf[4] + 1;
2076 if (adapt_len > 184)
2079 // Get pointer length
2080 int pointer_len = buf[4 + adapt_len] + 1;
2082 // Get payload start indicator
2084 start = (buf[1] & 0x40) != 0;
2089 // Add the payload for this packet to the current buffer
2090 if (reading && (184 - adapt_len) > 0)
2092 if (tablepos + 184 - adapt_len - pointer_len > 1024)
2094 hb_log("decode_PAT - Bad program section length (> 1024)");
2097 memcpy(tablebuf + tablepos, buf + 4 + adapt_len + pointer_len, 184 - adapt_len - pointer_len);
2098 tablepos += 184 - adapt_len - pointer_len;
2101 if (start && reading)
2103 memcpy(tablebuf + tablepos, buf + 4 + adapt_len + 1, pointer_len - 1);
2106 unsigned int pos = 0;
2107 //while (pos < tablepos)
2110 set_buf(&bb, tablebuf + pos, tablepos - pos, 0);
2112 unsigned char section_id = get_bits(&bb, 8);
2114 unsigned int section_len = get_bits(&bb, 12);
2115 get_bits(&bb, 16); // transport_id
2117 get_bits(&bb, 5); // version_num
2118 get_bits(&bb, 1); // current_next
2119 get_bits(&bb, 8); // section_num
2120 get_bits(&bb, 8); // last_section
2126 // Program Association Section
2127 section_len -= 5; // Already read transport stream ID, version num, section num, and last section num
2128 section_len -= 4; // Ignore the CRC
2130 stream->ts_number_pat_entries = 0;
2131 while ((curr_pos < section_len) && (stream->ts_number_pat_entries < kMaxNumberPMTStreams))
2133 unsigned int pkt_program_num = get_bits(&bb, 16);
2134 stream->pat_info[stream->ts_number_pat_entries].program_number = pkt_program_num;
2136 get_bits(&bb, 3); // Reserved
2137 if (pkt_program_num == 0)
2139 get_bits(&bb, 13); // pkt_network_id
2143 unsigned int pkt_program_map_PID = get_bits(&bb, 13);
2144 stream->pat_info[stream->ts_number_pat_entries].program_map_PID = pkt_program_map_PID;
2147 stream->ts_number_pat_entries++;
2161 pos += 3 + section_len;
2169 static void hb_ts_stream_find_pids(hb_stream_t *stream)
2171 // To be different from every other broadcaster in the world, New Zealand TV
2172 // changes PMTs (and thus video & audio PIDs) when 'programs' change. Since
2173 // we may have the tail of the previous program at the beginning of this
2174 // file, take our PMT from the middle of the file.
2175 fseeko(stream->file_handle, 0, SEEK_END);
2176 uint64_t fsize = ftello(stream->file_handle);
2177 fseeko(stream->file_handle, fsize >> 1, SEEK_SET);
2178 align_to_next_packet(stream);
2180 // Read the Transport Stream Packets (188 bytes each) looking at first for PID 0 (the PAT PID), then decode that
2181 // to find the program map PID and then decode that to get the list of audio and video PIDs
2185 const uint8_t *buf = next_packet( stream );
2189 hb_log("hb_ts_stream_find_pids - end of file");
2194 int pid = (((buf[1] & 0x1F) << 8) | buf[2]) & 0x1FFF;
2196 if ((pid == 0x0000) && (stream->ts_number_pat_entries == 0))
2198 decode_PAT(buf, stream);
2203 for (pat_index = 0; pat_index < stream->ts_number_pat_entries; pat_index++)
2205 // There are some streams where the PAT table has multiple entries as if their are
2206 // multiple programs in the same transport stream, and yet there's actually only one
2207 // program really in the stream. This seems to be true for transport streams that
2208 // originate in the HDHomeRun but have been output by EyeTV's export utility. What I think
2209 // is happening is that the HDHomeRun is sending the entire transport stream as broadcast,
2210 // but the EyeTV is only recording a single (selected) program number and not rewriting the
2211 // PAT info on export to match what's actually on the stream.
2212 // Until we have a way of handling multiple programs per transport stream elegantly we'll match
2213 // on the first pat entry for which we find a matching program map PID. The ideal solution would
2214 // be to build a title choice popup from the PAT program number details and then select from
2215 // their - but right now the API's not capable of that.
2216 if (stream->pat_info[pat_index].program_number != 0 &&
2217 pid == stream->pat_info[pat_index].program_map_PID)
2219 if (build_program_map(buf, stream) > 0)
2223 // Keep going until we have a complete set of PIDs
2224 if (stream->ts_number_video_pids > 0)
2228 hb_log("hb_ts_stream_find_pids - found the following PIDS");
2229 hb_log(" Video PIDS : ");
2231 for (i=0; i < stream->ts_number_video_pids; i++)
2233 hb_log( " 0x%x type %s (0x%x)",
2234 stream->ts_video_pids[i],
2235 stream_type_name(stream->ts_stream_type[i]),
2236 stream->ts_stream_type[i]);
2238 hb_log(" Audio PIDS : ");
2239 for (i = 0; i < stream->ts_number_audio_pids; i++)
2241 hb_log( " 0x%x type %s (0x%x)",
2242 stream->ts_audio_pids[i],
2243 stream_type_name(stream->ts_stream_type[i+1]),
2244 stream->ts_stream_type[i+1] );
2249 static void fwrite64( hb_stream_t *stream, void *buf, int len )
2253 int pos = stream->fwrite_buf->size;
2254 if ( pos + len > stream->fwrite_buf->alloc )
2256 int size = MAX(stream->fwrite_buf->alloc * 2, pos + len);
2257 hb_buffer_realloc(stream->fwrite_buf, size);
2259 memcpy( &(stream->fwrite_buf->data[pos]), buf, len );
2260 stream->fwrite_buf->size += len;
2264 // convert a PES PTS or DTS to an int64
2265 static int64_t pes_timestamp( const uint8_t *pes )
2267 int64_t ts = ( (uint64_t)(pes[0] & 0xe ) << 29 );
2268 ts |= ( pes[1] << 22 ) | ( ( pes[2] >> 1 ) << 15 ) |
2269 ( pes[3] << 7 ) | ( pes[4] >> 1 );
2273 static void generate_output_data(hb_stream_t *stream, int curstream)
2275 hb_buffer_t *buf = stream->fwrite_buf;
2276 uint8_t *tdat = stream->ts_buf[curstream]->data;
2278 buf->id = curstream;
2280 // check if this packet was referenced to an older pcr and if that
2281 // pcr was significantly different than the one we're using now.
2282 // (the reason for the uint cast on the pcr difference is that the
2283 // difference is significant if it advanced by more than 200ms or if
2284 // it went backwards by any amount. The negative numbers look like huge
2285 // unsigned ints so the cast allows both conditions to be checked at once.
2286 int bufpcr = stream->ts_buf[curstream]->cur;
2287 int curpcr = stream->ts_pcr_out;
2288 if ( bufpcr && bufpcr < curpcr &&
2289 (uint64_t)(stream->ts_pcrhist[curpcr & 3] - stream->ts_pcrhist[bufpcr & 3]) > 200*90LL )
2291 // we've sent up a new pcr but have a packet referenced to an
2292 // old pcr and the difference was enough to trigger a discontinuity
2293 // correction. smash the timestamps or we'll mess up the correction.
2295 buf->renderOffset = -1;
2299 if ( stream->ts_pcr_out != stream->ts_pcr_in )
2301 // we have a new pcr
2302 stream->ts_pcr_out = stream->ts_pcr_in;
2303 buf->stop = stream->ts_pcr;
2304 stream->ts_pcrhist[stream->ts_pcr_out & 3] = stream->ts_pcr;
2311 // put the PTS & possible DTS into 'start' & 'renderOffset' then strip
2312 // off the PES header.
2313 if ( tdat[7] & 0xc0 )
2315 buf->start = pes_timestamp( tdat + 9 );
2316 buf->renderOffset = ( tdat[7] & 0x40 )? pes_timestamp( tdat + 14 ) :
2322 buf->renderOffset = -1;
2325 int hlen = tdat[8] + 9;
2327 fwrite64( stream, tdat + hlen, stream->ts_pos[curstream] - hlen );
2329 stream->ts_pos[curstream] = 0;
2330 stream->ts_buf[curstream]->size = 0;
2333 static void hb_ts_stream_append_pkt(hb_stream_t *stream, int idx, const uint8_t *buf, int len)
2335 if (stream->ts_pos[idx] + len > stream->ts_buf[idx]->alloc)
2339 size = MAX(stream->ts_buf[idx]->alloc * 2, stream->ts_pos[idx] + len);
2340 hb_buffer_realloc(stream->ts_buf[idx], size);
2342 memcpy(stream->ts_buf[idx]->data + stream->ts_pos[idx], buf, len);
2343 stream->ts_pos[idx] += len;
2344 stream->ts_buf[idx]->size += len;
2347 /***********************************************************************
2348 * hb_ts_stream_decode
2349 ***********************************************************************
2351 **********************************************************************/
2352 static int hb_ts_stream_decode( hb_stream_t *stream, hb_buffer_t *obuf )
2355 * stash the output buffer pointer in our stream so we don't have to
2356 * pass it & its original value to everything we call.
2359 stream->fwrite_buf = obuf;
2361 // spin until we get a packet of data from some stream or hit eof
2366 const uint8_t *buf = next_packet(stream);
2369 // end of file - we didn't finish filling our ps write buffer
2370 // so just discard the remainder (the partial buffer is useless)
2371 hb_log("hb_ts_stream_decode - eof");
2375 /* This next section validates the packet */
2377 // Get pid and use it to find stream state.
2378 int pid = ((buf[1] & 0x1F) << 8) | buf[2];
2379 if ( ( curstream = index_of_pid( pid, stream ) ) < 0 )
2383 int errorbit = (buf[1] & 0x80) != 0;
2386 ts_err( stream, curstream, "packet error bit set");
2390 // Get adaption header info
2391 int adaption = (buf[3] & 0x30) >> 4;
2395 ts_err( stream, curstream, "adaptation code 0");
2398 else if (adaption == 0x2)
2400 else if (adaption == 0x3)
2402 adapt_len = buf[4] + 1;
2403 if (adapt_len > 184)
2405 ts_err( stream, curstream, "invalid adapt len %d", adapt_len);
2410 if ( adapt_len > 0 )
2412 if ( buf[5] & 0x40 )
2414 // found a random access point
2416 // if there's an adaptation header & PCR_flag is set
2417 // get the PCR (Program Clock Reference)
2418 if ( adapt_len > 7 && ( buf[5] & 0x10 ) != 0 )
2420 stream->ts_pcr = ( (uint64_t)buf[6] << (33 - 8) ) |
2421 ( (uint64_t)buf[7] << (33 - 16) ) |
2422 ( (uint64_t)buf[8] << (33 - 24) ) |
2423 ( (uint64_t)buf[9] << (33 - 32) ) |
2425 ++stream->ts_pcr_in;
2426 stream->ts_found_pcr = 1;
2430 // If we don't have a PCR yet but the stream has PCRs just loop
2431 // so we don't process anything until we have a clock reference.
2432 // Unfortunately the HD Home Run appears to null out the PCR so if
2433 // we didn't detect a PCR during scan keep going and we'll use
2434 // the video stream DTS for the PCR.
2436 if ( !stream->ts_found_pcr && ( stream->ts_flags & TS_HAS_PCR ) )
2442 // Continuity only increments for adaption values of 0x3 or 0x01
2443 // and is not checked for start packets.
2445 int start = (buf[1] & 0x40) != 0;
2447 if ( (adaption & 0x01) != 0 )
2449 int continuity = (buf[3] & 0xF);
2450 if ( continuity == stream->ts_streamcont[curstream] )
2452 // Spliced transport streams can have duplicate
2453 // continuity counts at the splice boundary.
2454 // Test to see if the packet is really a duplicate
2455 // by comparing packet summaries to see if they
2459 summary[0] = adaption;
2460 summary[1] = adapt_len;
2461 if (adapt_len + 4 + 6 + 9 <= 188)
2463 memcpy(&summary[2], buf+4+adapt_len+9, 6);
2467 memset(&summary[2], 0, 6);
2469 if ( memcmp( summary, stream->ts_pkt_summary[curstream], 8 ) == 0 )
2471 // we got a duplicate packet (usually used to introduce
2472 // a PCR when one is needed). The only thing that can
2473 // change in the dup is the PCR which we grabbed above
2474 // so ignore the rest.
2478 if ( !start && (stream->ts_streamcont[curstream] != -1) &&
2479 !stream->ts_skipbad[curstream] &&
2480 (continuity != ( (stream->ts_streamcont[curstream] + 1) & 0xf ) ) )
2482 ts_err( stream, curstream, "continuity error: got %d expected %d",
2484 (stream->ts_streamcont[curstream] + 1) & 0xf );
2485 stream->ts_streamcont[curstream] = continuity;
2488 stream->ts_streamcont[curstream] = continuity;
2490 // Save a summary of this packet for later duplicate
2491 // testing. The summary includes some header information
2492 // and payload bytes. Should be enough to detect
2494 stream->ts_pkt_summary[curstream][0] = adaption;
2495 stream->ts_pkt_summary[curstream][1] = adapt_len;
2496 if (adapt_len + 4 + 6 + 9 <= 188)
2498 memcpy(&stream->ts_pkt_summary[curstream][2],
2499 buf+4+adapt_len+9, 6);
2503 memset(&stream->ts_pkt_summary[curstream][2], 0, 6);
2507 /* If we get here the packet is valid - process its data */
2511 // Found a random access point (now we can start a frame/audio packet..)
2513 if ( stream->need_keyframe )
2515 // we're looking for the first video frame because we're
2516 // doing random access during 'scan'
2517 if ( curstream != 0 || !isIframe( stream, buf, adapt_len ) )
2519 // not the video stream or didn't find an I frame
2520 // but we'll only wait 255 video frames for an I frame.
2521 if ( curstream != 0 || ++stream->need_keyframe )
2526 stream->need_keyframe = 0;
2529 // If we were skipping a bad packet, start fresh on this new PES packet..
2530 if (stream->ts_skipbad[curstream] == 1)
2532 stream->ts_skipbad[curstream] = 0;
2535 if ( curstream == 0 )
2539 // if we don't have a pcr yet use the dts from this frame
2540 if ( !stream->ts_found_pcr )
2542 // PES must begin with an mpeg start code & contain
2544 const uint8_t *pes = buf + adapt_len + 4;
2545 if ( pes[0] != 0x00 || pes[1] != 0x00 || pes[2] != 0x01 ||
2546 ( pes[7] >> 6 ) == 0 )
2550 // if we have a dts use it otherwise use the pts
2551 stream->ts_pcr = pes_timestamp( pes + ( pes[7] & 0x40? 14 : 9 ) );
2552 ++stream->ts_pcr_in;
2556 // if this is a multiplexed stream make sure this is the
2557 // substream we want.
2558 if ( stream->ts_multiplexed[curstream] )
2560 // PES must begin with an mpeg start code & contain
2562 const uint8_t *pes = buf + adapt_len + 4;
2563 if ( pes[0] != 0x00 || pes[1] != 0x00 || pes[2] != 0x01 ||
2566 stream->ts_skipbad[curstream] = 1;
2569 // the last byte of the header is the extension id. see if
2570 // it's the one we want.
2571 if ( pes[pes[8]+8] != stream->ts_multiplexed[curstream] )
2573 stream->ts_skipbad[curstream] = 1;
2578 // If we have some data already on this stream, turn it into
2579 // a program stream packet. Then add the payload for this
2580 // packet to the current pid's buffer.
2581 if ( stream->ts_pos[curstream] )
2583 // we have to ship the old packet before updating the pcr
2584 // since the packet we've been accumulating is referenced
2586 generate_output_data(stream, curstream);
2588 // remember the pcr that was in effect when we started
2590 stream->ts_buf[curstream]->cur = stream->ts_pcr_in;
2591 hb_ts_stream_append_pkt(stream, curstream, buf + 4 + adapt_len,
2595 // remember the pcr that was in effect when we started this packet.
2596 stream->ts_buf[curstream]->cur = stream->ts_pcr_in;
2599 // Add the payload for this packet to the current buffer
2600 if (!stream->ts_skipbad[curstream] && (184 - adapt_len) > 0)
2602 hb_ts_stream_append_pkt(stream, curstream, buf + 4 + adapt_len,
2604 // see if we've hit the end of this PES packet
2605 const uint8_t *pes = stream->ts_buf[curstream]->data;
2606 int len = ( pes[4] << 8 ) + pes[5] + 6;
2607 if ( len > 6 && stream->ts_pos[curstream] == len &&
2608 pes[0] == 0x00 && pes[1] == 0x00 && pes[2] == 0x01 )
2610 generate_output_data(stream, curstream);
2617 static void hb_ts_stream_reset(hb_stream_t *stream)
2621 for (i=0; i < kMaxNumberDecodeStreams; i++)
2623 stream->ts_pos[i] = 0;
2624 stream->ts_skipbad[i] = 1;
2625 stream->ts_streamcont[i] = -1;
2628 stream->need_keyframe = 0;
2630 stream->ts_found_pcr = 0;
2631 stream->ts_pcr_out = 0;
2632 stream->ts_pcr_in = 0;
2637 stream->last_error_frame = -10000;
2638 stream->last_error_count = 0;
2640 align_to_next_packet(stream);
2643 // ------------------------------------------------------------------
2644 // Support for reading media files via the ffmpeg libraries.
2646 static void ffmpeg_add_codec( hb_stream_t *stream, int stream_index )
2648 // add a codec to the context here so it will be there when we
2649 // read the first packet.
2650 AVCodecContext *context = stream->ffmpeg_ic->streams[stream_index]->codec;
2651 context->workaround_bugs = FF_BUG_AUTODETECT;
2652 context->error_recognition = 1;
2653 context->error_concealment = FF_EC_GUESS_MVS|FF_EC_DEBLOCK;
2654 AVCodec *codec = avcodec_find_decoder( context->codec_id );
2655 hb_avcodec_open( context, codec );
2658 // The ffmpeg stream reader / parser shares a lot of state with the
2659 // decoder via a codec context kept in the AVStream of the reader's
2660 // AVFormatContext. Since decoding is done in a different thread we
2661 // have to somehow pass this codec context to the decoder and we have
2662 // to do it before the first packet is read (so we can't put the info
2663 // in the buf we'll send downstream). Decoders don't have any way to
2664 // get to the stream directly (they're not passed the title or job
2665 // pointers during a scan) so this is a back door for the decoder to
2666 // get the codec context. We just stick the stream pointer in the next
2667 // slot an array of pointers maintained as a circular list then return
2668 // the index into the list combined with the ffmpeg stream index as the
2669 // codec_param that will be passed to the decoder init routine. We make
2670 // the list 'big' (enough for 1024 simultaneously open ffmpeg streams)
2671 // so that we don't have to do a complicated allocator or worry about
2672 // deleting entries on close.
2674 // Entries can only be added to this list during a scan and are never
2675 // deleted so the list access doesn't require locking.
2676 static hb_stream_t **ffmpeg_streams; // circular list of stream pointers
2677 static int ffmpeg_stream_cur; // where we put the last stream pointer
2678 #define ffmpeg_sl_bits (10) // log2 stream list size (in entries)
2679 #define ffmpeg_sl_size (1 << ffmpeg_sl_bits)
2681 // add a stream to the list & return the appropriate codec_param to access it
2682 static int ffmpeg_codec_param( hb_stream_t *stream, int stream_index )
2684 if ( !ffmpeg_streams )
2686 ffmpeg_streams = calloc( ffmpeg_sl_size, sizeof(stream) );
2689 // the title scan adds all the ffmpeg media streams at once so we
2690 // only add a new entry to our stream list if the stream is different
2692 int slot = ffmpeg_stream_cur;
2693 if ( ffmpeg_streams[slot] != stream )
2695 // new stream - put it in the next slot of the stream list
2696 slot = ++ffmpeg_stream_cur & (ffmpeg_sl_size - 1);
2697 ffmpeg_streams[slot] = stream;
2700 ffmpeg_add_codec( stream, stream_index );
2702 return ( stream_index << ffmpeg_sl_bits ) | slot;
2705 // we're about to open 'title' to convert it - remap the stream associated
2706 // with the video & audio codec params of the title to refer to 'stream'
2707 // (the original scan stream was closed and no longer exists).
2708 static void ffmpeg_remap_stream( hb_stream_t *stream, hb_title_t *title )
2710 // all the video & audio came from the same stream so remapping
2711 // the video's stream slot takes care of everything.
2712 int slot = title->video_codec_param & (ffmpeg_sl_size - 1);
2713 ffmpeg_streams[slot] = stream;
2715 // add codecs for all the streams used by the title
2716 ffmpeg_add_codec( stream, title->video_codec_param >> ffmpeg_sl_bits );
2720 for ( i = 0; ( audio = hb_list_item( title->list_audio, i ) ); ++i )
2722 if ( audio->config.in.codec == HB_ACODEC_FFMPEG )
2724 ffmpeg_add_codec( stream,
2725 audio->config.in.codec_param >> ffmpeg_sl_bits );
2730 void *hb_ffmpeg_context( int codec_param )
2732 int slot = codec_param & (ffmpeg_sl_size - 1);
2733 int stream_index = codec_param >> ffmpeg_sl_bits;
2734 return ffmpeg_streams[slot]->ffmpeg_ic->streams[stream_index]->codec;
2737 void *hb_ffmpeg_avstream( int codec_param )
2739 int slot = codec_param & (ffmpeg_sl_size - 1);
2740 int stream_index = codec_param >> ffmpeg_sl_bits;
2741 return ffmpeg_streams[slot]->ffmpeg_ic->streams[stream_index];
2744 static AVFormatContext *ffmpeg_deferred_close;
2746 static int ffmpeg_open( hb_stream_t *stream, hb_title_t *title )
2748 if ( ffmpeg_deferred_close )
2750 av_close_input_file( ffmpeg_deferred_close );
2751 ffmpeg_deferred_close = NULL;
2753 AVFormatContext *ic;
2755 av_log_set_level( AV_LOG_ERROR );
2756 if ( av_open_input_file( &ic, stream->path, NULL, 0, NULL ) < 0 )
2760 if ( av_find_stream_info( ic ) < 0 )
2763 stream->ffmpeg_ic = ic;
2764 stream->hb_stream_type = ffmpeg;
2765 stream->ffmpeg_pkt = malloc(sizeof(*stream->ffmpeg_pkt));
2766 av_init_packet( stream->ffmpeg_pkt );
2767 stream->chapter_end = INT64_MAX;
2771 // we're opening for read. scan passed out codec params that
2772 // indexed its stream so we need to remap them so they point
2774 ffmpeg_remap_stream( stream, title );
2775 av_log_set_level( AV_LOG_ERROR );
2779 // we're opening for scan. let ffmpeg put some info into the
2780 // log about what we've got.
2781 av_log_set_level( AV_LOG_INFO );
2782 dump_format( ic, 0, stream->path, 0 );
2783 av_log_set_level( AV_LOG_ERROR );
2785 // accept this file if it has at least one video stream we can decode
2787 for (i = 0; i < ic->nb_streams; ++i )
2789 if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO )
2794 if ( i >= ic->nb_streams )
2800 av_close_input_file( ic );
2804 static void ffmpeg_close( hb_stream_t *d )
2806 // XXX since we're sharing the CodecContext with the downstream
2807 // decoder proc we can't close the stream. We need to reference count
2808 // this so we can close it when both are done with their instance but
2809 // for now just defer the close until the next stream open or close.
2810 if ( ffmpeg_deferred_close )
2812 av_close_input_file( ffmpeg_deferred_close );
2814 ffmpeg_deferred_close = d->ffmpeg_ic;
2815 if ( d->ffmpeg_pkt != NULL )
2817 free( d->ffmpeg_pkt );
2818 d->ffmpeg_pkt = NULL;
2822 static void add_ffmpeg_audio( hb_title_t *title, hb_stream_t *stream, int id )
2824 AVStream *st = stream->ffmpeg_ic->streams[id];
2825 AVCodecContext *codec = st->codec;
2828 // scan will ignore any audio without a bitrate. Since we've already
2829 // typed the audio in order to determine its codec we set up the audio
2831 layout = hb_ff_layout_xlat( codec->channel_layout, codec->channels );
2834 // Unsupported layout
2837 if ( codec->bit_rate || codec->sample_rate )
2839 hb_audio_t *audio = calloc( 1, sizeof(*audio) );;
2842 if ( codec->codec_id == CODEC_ID_AC3 )
2844 audio->config.in.codec = HB_ACODEC_AC3;
2846 else if ( codec->codec_id == CODEC_ID_DTS )
2848 audio->config.in.codec = HB_ACODEC_DCA;
2852 audio->config.in.codec = HB_ACODEC_FFMPEG;
2853 audio->config.in.codec_param = ffmpeg_codec_param( stream, id );
2855 audio->config.in.bitrate = codec->bit_rate? codec->bit_rate : 1;
2856 audio->config.in.samplerate = codec->sample_rate;
2857 audio->config.in.channel_layout = layout;
2860 set_audio_description( audio, lang_for_code2( st->language ) );
2862 hb_list_add( title->list_audio, audio );
2868 * MkvVobSubtitlePrivateData = ( Line )*
2869 * Line = FieldName ':' ' ' FieldValue '\n'
2871 * FieldValue = [^\n]+
2873 * The line of interest is:
2874 * PaletteLine = "palette" ':' ' ' RRGGBB ( ',' ' ' RRGGBB )*
2876 * More information on the format at:
2877 * http://www.matroska.org/technical/specs/subtitles/images.html
2879 static int ffmpeg_parse_vobsub_extradata_mkv( AVCodecContext *codec, hb_subtitle_t *subtitle )
2881 // lines = (string) codec->extradata;
2882 char *lines = malloc( codec->extradata_size + 1 );
2883 if ( lines == NULL )
2885 memcpy( lines, codec->extradata, codec->extradata_size );
2886 lines[codec->extradata_size] = '\0';
2890 int gotDimensions = 0;
2892 char *curLine, *curLine_parserData;
2893 for ( curLine = strtok_r( lines, "\n", &curLine_parserData );
2895 curLine = strtok_r( NULL, "\n", &curLine_parserData ) )
2899 int numElementsRead = sscanf(curLine, "palette: "
2900 "%06x, %06x, %06x, %06x, "
2901 "%06x, %06x, %06x, %06x, "
2902 "%06x, %06x, %06x, %06x, "
2903 "%06x, %06x, %06x, %06x",
2904 &rgb[0], &rgb[1], &rgb[2], &rgb[3],
2905 &rgb[4], &rgb[5], &rgb[6], &rgb[7],
2906 &rgb[8], &rgb[9], &rgb[10], &rgb[11],
2907 &rgb[12], &rgb[13], &rgb[14], &rgb[15]);
2909 if (numElementsRead == 16) {
2915 int numElementsRead = sscanf(curLine, "size: %dx%d",
2916 &subtitle->width, &subtitle->height);
2918 if (numElementsRead == 2) {
2922 if (gotPalette && gotDimensions)
2926 if (subtitle->width == 0 || subtitle->height == 0)
2928 subtitle->width = 720;
2929 subtitle->height = 480;
2937 for (i=0; i<16; i++)
2938 subtitle->palette[i] = hb_rgb2yuv(rgb[i]);
2948 * Format: 8-bit {0,Y,Cb,Cr} x 16
2950 static int ffmpeg_parse_vobsub_extradata_mp4( AVCodecContext *codec, hb_subtitle_t *subtitle )
2952 if ( codec->extradata_size != 4*16 )
2956 for ( i=0, j=0; i<16; i++, j+=4 )
2958 subtitle->palette[i] =
2959 codec->extradata[j+1] << 16 | // Y
2960 codec->extradata[j+2] << 8 | // Cb
2961 codec->extradata[j+3] << 0; // Cr
2963 if (codec->width <= 0 || codec->height <= 0)
2965 subtitle->width = 720;
2966 subtitle->height = 480;
2970 subtitle->width = codec->width;
2971 subtitle->height = codec->height;
2977 * Parses the 'subtitle->palette' information from the specific VOB subtitle track's private data.
2978 * Returns 0 if successful or 1 if parsing failed or was incomplete.
2980 static int ffmpeg_parse_vobsub_extradata( AVCodecContext *codec, hb_subtitle_t *subtitle )
2982 // XXX: Better if we actually chose the correct parser based on the input container
2984 ffmpeg_parse_vobsub_extradata_mkv( codec, subtitle ) &&
2985 ffmpeg_parse_vobsub_extradata_mp4( codec, subtitle );
2988 static void add_ffmpeg_subtitle( hb_title_t *title, hb_stream_t *stream, int id )
2990 AVStream *st = stream->ffmpeg_ic->streams[id];
2991 AVCodecContext *codec = st->codec;
2993 hb_subtitle_t *subtitle = calloc( 1, sizeof(*subtitle) );
2997 switch ( codec->codec_id )
2999 case CODEC_ID_DVD_SUBTITLE:
3000 subtitle->format = PICTURESUB;
3001 subtitle->source = VOBSUB;
3002 subtitle->config.dest = RENDERSUB; // By default render (burn-in) the VOBSUB.
3003 if ( ffmpeg_parse_vobsub_extradata( codec, subtitle ) )
3004 hb_log( "add_ffmpeg_subtitle: malformed extradata for VOB subtitle track; "
3005 "subtitle colors likely to be wrong" );
3008 subtitle->format = TEXTSUB;
3009 subtitle->source = UTF8SUB;
3010 subtitle->config.dest = PASSTHRUSUB;
3012 case CODEC_ID_MOV_TEXT: // TX3G
3013 subtitle->format = TEXTSUB;
3014 subtitle->source = TX3GSUB;
3015 subtitle->config.dest = PASSTHRUSUB;
3018 subtitle->format = TEXTSUB;
3019 subtitle->source = SSASUB;
3020 subtitle->config.dest = PASSTHRUSUB;
3023 hb_log( "add_ffmpeg_subtitle: unknown subtitle stream type: 0x%x", (int) codec->codec_id );
3028 iso639_lang_t *language = lang_for_code2( st->language );
3029 strcpy( subtitle->lang, language->eng_name );
3030 strncpy( subtitle->iso639_2, language->iso639_2, 4 );
3032 hb_list_add(title->list_subtitle, subtitle);
3035 static hb_title_t *ffmpeg_title_scan( hb_stream_t *stream )
3037 AVFormatContext *ic = stream->ffmpeg_ic;
3039 // 'Barebones Title'
3040 hb_title_t *title = hb_title_init( stream->path, 0 );
3041 title->type = HB_STREAM_TYPE;
3044 // Copy part of the stream path to the title name
3045 char *sep = strrchr(stream->path, '/');
3047 strcpy(title->name, sep+1);
3048 char *dot_term = strrchr(title->name, '.');
3052 uint64_t dur = ic->duration * 90000 / AV_TIME_BASE;
3053 title->duration = dur;
3055 title->hours = dur / 3600;
3056 title->minutes = ( dur % 3600 ) / 60;
3057 title->seconds = dur % 60;
3059 // set the title to decode the first video stream in the file
3060 title->demuxer = HB_NULL_DEMUXER;
3061 title->video_codec = 0;
3063 for (i = 0; i < ic->nb_streams; ++i )
3065 if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO &&
3066 avcodec_find_decoder( ic->streams[i]->codec->codec_id ) &&
3067 title->video_codec == 0 )
3069 AVCodecContext *context = ic->streams[i]->codec;
3070 if ( context->pix_fmt != PIX_FMT_YUV420P &&
3071 !sws_isSupportedInput( context->pix_fmt ) )
3073 hb_log( "ffmpeg_title_scan: Unsupported color space" );
3076 title->video_id = i;
3077 stream->ffmpeg_video_id = i;
3079 // We have to use the 'internal' avcodec decoder because
3080 // it needs to share the codec context from this video
3081 // stream. The parser internal to av_read_frame
3082 // passes a bunch of state info to the decoder via the context.
3083 title->video_codec = WORK_DECAVCODECVI;
3084 title->video_codec_param = ffmpeg_codec_param( stream, i );
3086 else if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO &&
3087 avcodec_find_decoder( ic->streams[i]->codec->codec_id ) )
3089 add_ffmpeg_audio( title, stream, i );
3091 else if ( ic->streams[i]->codec->codec_type == CODEC_TYPE_SUBTITLE )
3093 add_ffmpeg_subtitle( title, stream, i );
3097 title->container_name = strdup( ic->iformat->name );
3098 title->data_rate = ic->bit_rate;
3100 hb_deep_log( 2, "Found ffmpeg %d chapters, container=%s", ic->nb_chapters, ic->iformat->name );
3102 if( ic->nb_chapters != 0 )
3105 uint64_t duration_sum = 0;
3106 for( i = 0; i < ic->nb_chapters; i++ )
3107 if( ( m = ic->chapters[i] ) != NULL )
3109 hb_chapter_t * chapter;
3110 chapter = calloc( sizeof( hb_chapter_t ), 1 );
3111 chapter->index = i+1;
3112 chapter->duration = ( m->end / ( (double) m->time_base.num * m->time_base.den ) ) * 90000 - duration_sum;
3113 duration_sum += chapter->duration;
3114 chapter->hours = chapter->duration / 90000 / 3600;
3115 chapter->minutes = ( ( chapter->duration / 90000 ) % 3600 ) / 60;
3116 chapter->seconds = ( chapter->duration / 90000 ) % 60;
3117 strcpy( chapter->title, m->title );
3118 hb_deep_log( 2, "Added chapter %i, name='%s', dur=%"PRIu64", (%02i:%02i:%02i)",
3119 chapter->index, chapter->title,
3120 chapter->duration, chapter->hours,
3121 chapter->minutes, chapter->seconds );
3122 hb_list_add( title->list_chapter, chapter );
3127 * Fill the metadata.
3129 decmetadata( title );
3131 if( hb_list_count( title->list_chapter ) == 0 )
3133 // Need at least one chapter
3134 hb_chapter_t * chapter;
3135 chapter = calloc( sizeof( hb_chapter_t ), 1 );
3137 chapter->duration = title->duration;
3138 chapter->hours = title->hours;
3139 chapter->minutes = title->minutes;
3140 chapter->seconds = title->seconds;
3141 hb_list_add( title->list_chapter, chapter );
3147 static int64_t av_to_hb_pts( int64_t pts, double conv_factor )
3149 if ( pts == AV_NOPTS_VALUE )
3151 return (int64_t)( (double)pts * conv_factor );
3154 static int ffmpeg_is_keyframe( hb_stream_t *stream )
3158 switch ( stream->ffmpeg_ic->streams[stream->ffmpeg_video_id]->codec->codec_id )
3161 // XXX the VC1 codec doesn't mark key frames so to get previews
3162 // we do it ourselves here. The decoder gets messed up if it
3163 // doesn't get a SEQ header first so we consider that to be a key frame.
3164 pkt = stream->ffmpeg_pkt->data;
3165 if ( !pkt[0] && !pkt[1] && pkt[2] == 1 && pkt[3] == 0x0f )
3171 // XXX the ffmpeg WMV3 codec doesn't mark key frames.
3172 // Only M$ could make I-frame detection this complicated: there
3173 // are two to four bits of unused junk ahead of the frame type
3174 // so we have to look at the sequence header to find out how much
3175 // to skip. Then there are three different ways of coding the type
3176 // depending on whether it's main or advanced profile then whether
3177 // there are bframes or not so we have to look at the sequence
3178 // header to get that.
3179 pkt = stream->ffmpeg_pkt->data;
3180 uint8_t *seqhdr = stream->ffmpeg_ic->streams[stream->ffmpeg_video_id]->codec->extradata;
3182 if ( ( seqhdr[3] & 0x02 ) == 0 )
3185 if ( ( seqhdr[3] & 0x80 ) == 0 )
3186 // no RANGEREDUCTION
3188 if ( seqhdr[3] & 0x70 )
3189 // stream has b-frames
3190 return ( ( pkt[0] >> pshift ) & 0x3 ) == 0x01;
3192 return ( ( pkt[0] >> pshift ) & 0x2 ) == 0;
3197 return ( stream->ffmpeg_pkt->flags & PKT_FLAG_KEY );
3200 static int ffmpeg_read( hb_stream_t *stream, hb_buffer_t *buf )
3204 if ( ( err = av_read_frame( stream->ffmpeg_ic, stream->ffmpeg_pkt )) < 0 )
3206 // XXX the following conditional is to handle avi files that
3207 // use M$ 'packed b-frames' and occasionally have negative
3208 // sizes for the null frames these require.
3209 if ( err != AVERROR_NOMEM || stream->ffmpeg_pkt->size >= 0 )
3213 if ( stream->ffmpeg_pkt->size <= 0 )
3215 // M$ "invalid and inefficient" packed b-frames require 'null frames'
3216 // following them to preserve the timing (since the packing puts two
3217 // or more frames in what looks like one avi frame). The contents and
3218 // size of these null frames are ignored by the ff_h263_decode_frame
3219 // as long as they're < 20 bytes. We need a positive size so we use
3220 // one byte if we're given a zero or negative size. We don't know
3221 // if the pkt data points anywhere reasonable so we just stick a
3222 // byte of zero in our outbound buf.
3228 if ( stream->ffmpeg_pkt->size > buf->alloc )
3230 // sometimes we get absurd sizes from ffmpeg
3231 if ( stream->ffmpeg_pkt->size >= (1 << 25) )
3233 hb_log( "ffmpeg_read: pkt too big: %d bytes", stream->ffmpeg_pkt->size );
3234 av_free_packet( stream->ffmpeg_pkt );
3235 return ffmpeg_read( stream, buf );
3237 // need to expand buffer
3238 hb_buffer_realloc( buf, stream->ffmpeg_pkt->size );
3240 memcpy( buf->data, stream->ffmpeg_pkt->data, stream->ffmpeg_pkt->size );
3241 buf->size = stream->ffmpeg_pkt->size;
3243 buf->id = stream->ffmpeg_pkt->stream_index;
3244 if ( buf->id == stream->ffmpeg_video_id )
3246 if ( stream->need_keyframe )
3248 // we've just done a seek (generally for scan or live preview) and
3249 // want to start at a keyframe. Some ffmpeg codecs seek to a key
3250 // frame but most don't. So we spin until we either get a keyframe
3251 // or we've looked through 50 video frames without finding one.
3252 if ( ! ffmpeg_is_keyframe( stream ) && ++stream->need_keyframe < 50 )
3254 av_free_packet( stream->ffmpeg_pkt );
3257 stream->need_keyframe = 0;
3262 // if we haven't done it already, compute a conversion factor to go
3263 // from the ffmpeg timebase for the stream to HB's 90KHz timebase.
3264 double tsconv = stream->ffmpeg_tsconv[stream->ffmpeg_pkt->stream_index];
3267 AVStream *s = stream->ffmpeg_ic->streams[stream->ffmpeg_pkt->stream_index];
3268 tsconv = 90000. * (double)s->time_base.num / (double)s->time_base.den;
3269 stream->ffmpeg_tsconv[stream->ffmpeg_pkt->stream_index] = tsconv;
3272 buf->start = av_to_hb_pts( stream->ffmpeg_pkt->pts, tsconv );
3273 buf->renderOffset = av_to_hb_pts( stream->ffmpeg_pkt->dts, tsconv );
3274 if ( buf->renderOffset >= 0 && buf->start == -1 )
3276 buf->start = buf->renderOffset;
3278 else if ( buf->renderOffset == -1 && buf->start >= 0 )
3280 buf->renderOffset = buf->start;
3284 * Fill out buf->stop for subtitle packets
3286 * libavcodec's MKV demuxer stores the duration of UTF-8 subtitles (CODEC_ID_TEXT)
3287 * in the 'convergence_duration' field for some reason.
3289 * Other subtitles' durations are stored in the 'duration' field.
3291 * VOB subtitles (CODEC_ID_DVD_SUBTITLE) do not have their duration stored in
3292 * either field. This is not a problem because the VOB decoder can extract this
3293 * information from the packet payload itself.
3295 * SSA subtitles (CODEC_ID_SSA) do not have their duration stored in
3296 * either field. This is not a problem because the SSA decoder can extract this
3297 * information from the packet payload itself.
3299 enum CodecID ffmpeg_pkt_codec = stream->ffmpeg_ic->streams[stream->ffmpeg_pkt->stream_index]->codec->codec_id;
3300 if ( ffmpeg_pkt_codec == CODEC_ID_TEXT ) {
3301 int64_t ffmpeg_pkt_duration = stream->ffmpeg_pkt->convergence_duration;
3302 int64_t buf_duration = av_to_hb_pts( ffmpeg_pkt_duration, tsconv );
3303 buf->stop = buf->start + buf_duration;
3305 if ( ffmpeg_pkt_codec == CODEC_ID_MOV_TEXT ) {
3306 int64_t ffmpeg_pkt_duration = stream->ffmpeg_pkt->duration;
3307 int64_t buf_duration = av_to_hb_pts( ffmpeg_pkt_duration, tsconv );
3308 buf->stop = buf->start + buf_duration;
3312 * Check to see whether this video buffer is on a chapter
3313 * boundary, if so mark it as such in the buffer then advance
3314 * chapter_end to the end of the next chapter.
3315 * If there are no chapters, chapter_end is always initialized to INT64_MAX
3316 * (roughly 3 million years at our 90KHz clock rate) so the test
3317 * below handles both the chapters & no chapters case.
3319 if ( buf->id == stream->ffmpeg_video_id && buf->start >= stream->chapter_end )
3321 hb_chapter_t *chapter = hb_list_item( stream->title->list_chapter,
3322 stream->chapter+1 );
3326 stream->chapter_end += chapter->duration;
3327 buf->new_chap = stream->chapter + 1;
3328 hb_deep_log( 2, "ffmpeg_read starting chapter %i at %"PRId64,
3329 buf->new_chap, buf->start);
3331 // Must have run out of chapters, stop looking.
3332 stream->chapter_end = INT64_MAX;
3337 av_free_packet( stream->ffmpeg_pkt );
3341 static int ffmpeg_seek( hb_stream_t *stream, float frac )
3343 AVFormatContext *ic = stream->ffmpeg_ic;
3346 int64_t pos = (double)ic->duration * (double)frac;
3347 if ( ic->start_time != AV_NOPTS_VALUE && ic->start_time > 0 )
3349 pos += ic->start_time;
3351 av_seek_frame( ic, -1, pos, 0 );
3352 stream->need_keyframe = 1;
3356 av_seek_frame( ic, -1, 0LL, AVSEEK_FLAG_BACKWARD );
3361 // Assumes that we are always seeking forward
3362 static int ffmpeg_seek_ts( hb_stream_t *stream, int64_t ts )
3364 AVFormatContext *ic = stream->ffmpeg_ic;
3367 pos = ts * AV_TIME_BASE / 90000 + ffmpeg_initial_timestamp( stream );
3368 stream->need_keyframe = 1;
3369 // Seek to the nearest timestamp before that requested where
3370 // there is an I-frame
3371 return av_seek_frame( ic, -1, pos, AVSEEK_FLAG_BACKWARD );