1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2005 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Gertjan Van Droogenbroeck <gertjanvd _PLUS_ vlc _AT_ gmail _DOT_ com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
40 /*****************************************************************************
42 *****************************************************************************/
43 static int Open ( vlc_object_t * );
44 static void Close ( vlc_object_t * );
47 set_category( CAT_INPUT )
48 set_subcategory( SUBCAT_INPUT_DEMUX )
49 set_description( N_("Nuv demuxer") )
50 set_capability( "demux", 145 )
51 set_callbacks( Open, Close )
55 /*****************************************************************************
57 *****************************************************************************/
58 static int Demux ( demux_t * );
59 static int Control( demux_t *, int, va_list );
67 } demux_index_entry_t;
74 demux_index_entry_t *idx;
78 static void demux_IndexInit( demux_index_t * );
79 static void demux_IndexClean( demux_index_t * );
80 static void demux_IndexAppend( demux_index_t *,
81 int64_t i_time, int64_t i_offset );
82 /* Convert a time into offset */
83 static int64_t demux_IndexConvertTime( demux_index_t *, int64_t i_time );
84 /* Find the nearest offset in the index */
85 static int64_t demux_IndexFindOffset( demux_index_t *, int64_t i_offset );
91 char id[12]; /* "NuppelVideo\0" or "MythTVVideo\0" */
92 char version[5]; /* "x.xx\0" */
99 char i_mode; /* P progressive, I interlaced */
101 double d_aspect; /* 1.0 squared pixel */
104 int i_video_blocks; /* 0 no video, -1 unknown */
108 int i_keyframe_distance;
112 #define NUV_FH_SIZE 12
115 char i_type; /* A: audio, V: video, S: sync; T: test
116 R: Seekpoint (string:RTjjjjjjjj)
117 D: Extra data for codec
118 X: extended data Q: seektable */
119 char i_compression; /* V: 0 uncompressed
124 A: 0 uncompressed (44100 1-bits, 2ch)
130 N null frame loudless
132 S: B audio and vdeo sync point
133 A audio sync info (timecode == effective
135 V next video sync (timecode == next video
137 S audio,video,text correlation */
138 char i_keyframe; /* 0 keyframe, else no no key frame */
139 uint8_t i_filters; /* 0x01: gauss 5 pixel (8,2,2,2,2)/16
140 0x02: gauss 5 pixel (8,1,1,1,1)/12
141 0x04: cartoon filter */
143 int i_timecode; /* ms */
145 int i_length; /* V,A,T: length of following data
146 S: length of packet correl */
152 vlc_fourcc_t i_video_fcc;
154 vlc_fourcc_t i_audio_fcc;
155 int i_audio_sample_rate;
156 int i_audio_bits_per_sample;
157 int i_audio_channels;
158 int i_audio_compression_ratio;
160 int i_rtjpeg_quality;
161 int i_rtjpeg_luma_filter;
162 int i_rtjpeg_chroma_filter;
167 int64_t i_seektable_offset;
168 int64_t i_keyframe_adjust_offset;
175 extended_header_t exh;
178 es_out_id_t *p_es_video;
182 es_out_id_t *p_es_audio;
188 /* frameheader buffer */
189 uint8_t fh_buffer[NUV_FH_SIZE];
190 int64_t i_total_frames;
191 int64_t i_total_length;
192 /* first frame position (used for calculating size without seektable) */
193 int i_first_frame_offset;
196 static int HeaderLoad( demux_t *, header_t *h );
197 static int FrameHeaderLoad( demux_t *, frame_header_t *h );
198 static int ExtendedHeaderLoad( demux_t *, extended_header_t *h );
199 static int SeekTableLoad( demux_t *, demux_sys_t * );
200 static int ControlSetPosition( demux_t *p_demux, int64_t i_pos, bool b_guess );
202 /*****************************************************************************
203 * Open: initializes ES structures
204 *****************************************************************************/
205 static int Open( vlc_object_t * p_this )
207 demux_t *p_demux = (demux_t*)p_this;
209 const uint8_t *p_peek;
214 if( stream_Peek( p_demux->s, &p_peek, 12 ) != 12 ||
215 ( strncmp( (char *)p_peek, "MythTVVideo", 11 ) &&
216 strncmp( (char *)p_peek, "NuppelVideo", 11 ) ) )
219 p_sys = malloc( sizeof( demux_sys_t ) );
222 memset( p_sys, 0, sizeof( demux_sys_t ) );
223 p_sys->p_es_video = NULL;
224 p_sys->p_es_audio = NULL;
225 p_sys->p_extra_f = NULL;
227 p_sys->b_index = false;
228 p_sys->i_total_frames = -1;
229 p_sys->i_total_length = -1;
230 demux_IndexInit( &p_sys->idx );
232 p_demux->p_sys = p_sys;
234 /* Info about the stream */
235 stream_Control( p_demux->s, STREAM_CAN_SEEK, &p_sys->b_seekable );
237 if( p_sys->b_seekable )
238 msg_Dbg( p_demux, "stream is seekable" );
240 msg_Dbg( p_demux, "stream is NOT seekable" );
243 if( HeaderLoad( p_demux, &p_sys->hdr ) )
247 if( FrameHeaderLoad( p_demux, &fh ) || fh.i_type != 'D' )
249 if( fh.i_length > 0 )
251 if( fh.i_compression == 'F' || fh.i_compression == 'R' )
253 /* ffmpeg extra data */
254 p_sys->i_extra_f = fh.i_length;
255 p_sys->p_extra_f = malloc( fh.i_length );
256 if( p_sys->p_extra_f == NULL || stream_Read( p_demux->s,
257 p_sys->p_extra_f, fh.i_length ) != fh.i_length )
262 msg_Warn( p_demux, "unsupported 'D' frame (c=%c)", fh.i_compression );
263 if( stream_Read( p_demux->s, NULL, fh.i_length ) != fh.i_length )
268 /* Check and load extented */
269 if( stream_Peek( p_demux->s, &p_peek, 1 ) != 1 )
271 if( p_peek[0] == 'X' )
275 if( FrameHeaderLoad( p_demux, &fh ) )
277 if( fh.i_length != 512 )
280 if( ExtendedHeaderLoad( p_demux, &p_sys->exh ) )
283 if( !p_sys->b_seekable )
284 msg_Warn( p_demux, "stream is not seekable, skipping seektable" );
285 else if( SeekTableLoad( p_demux, p_sys ) )
293 /* XXX: for now only file with extended chunk are supported
294 * why: because else we need to have support for rtjpeg+stupid nuv shit */
295 msg_Err( p_demux, "incomplete NUV support (upload samples)" );
299 /* Create audio/video (will work only with extended header and audio=mp3 */
300 if( p_sys->hdr.i_video_blocks != 0 )
304 es_format_Init( &fmt, VIDEO_ES, p_sys->exh.i_video_fcc );
305 fmt.video.i_width = p_sys->hdr.i_width;
306 fmt.video.i_height = p_sys->hdr.i_height;
307 fmt.i_extra = p_sys->i_extra_f;
308 fmt.p_extra = p_sys->p_extra_f;
309 fmt.video.i_sar_num = p_sys->hdr.d_aspect * fmt.video.i_height;
310 fmt.video.i_sar_den = fmt.video.i_width;
312 p_sys->p_es_video = es_out_Add( p_demux->out, &fmt );
314 if( p_sys->hdr.i_audio_blocks != 0 )
318 es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_MPGA );
319 fmt.audio.i_rate = p_sys->exh.i_audio_sample_rate;
320 fmt.audio.i_bitspersample = p_sys->exh.i_audio_bits_per_sample;
322 p_sys->p_es_audio = es_out_Add( p_demux->out, &fmt );
324 if( p_sys->hdr.i_text_blocks != 0 )
326 msg_Warn( p_demux, "text not yet supported (upload samples)" );
329 p_sys->i_first_frame_offset = stream_Tell( p_demux->s );
331 /* Fill p_demux fields */
332 p_demux->pf_demux = Demux;
333 p_demux->pf_control = Control;
338 msg_Warn( p_demux, "cannot load Nuv file" );
339 p_demux->p_sys = NULL;
344 /*****************************************************************************
345 * Close: frees unused data
346 *****************************************************************************/
347 static void Close( vlc_object_t * p_this )
349 demux_t *p_demux = (demux_t*)p_this;
350 demux_sys_t *p_sys = p_demux->p_sys;
352 free( p_sys->p_extra_f );
353 demux_IndexClean( &p_sys->idx );
357 /*****************************************************************************
358 * Demux: reads and demuxes data packets
359 *****************************************************************************
360 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
361 *****************************************************************************/
362 static int Demux( demux_t *p_demux )
364 demux_sys_t *p_sys = p_demux->p_sys;
370 if( !vlc_object_alive (p_demux) )
373 if( FrameHeaderLoad( p_demux, &fh ) )
376 if( fh.i_type == 'A' || fh.i_type == 'V' )
379 /* TODO add support for some block type */
381 if( fh.i_type != 'R' && fh.i_length > 0 )
383 if( stream_Read( p_demux->s, NULL, fh.i_length ) != fh.i_length )
389 if( ( p_data = stream_Block( p_demux->s, fh.i_length ) ) == NULL )
392 p_data->i_dts = (int64_t)fh.i_timecode * 1000;
393 p_data->i_pts = (fh.i_type == 'V') ? 0 : p_data->i_dts;
395 /* only add keyframes to index */
396 if( !fh.i_keyframe && !p_sys->b_index )
397 demux_IndexAppend( &p_sys->idx, p_data->i_dts, stream_Tell(p_demux->s) - NUV_FH_SIZE );
400 if( p_data->i_dts > p_sys->i_pcr )
402 p_sys->i_pcr = p_data->i_dts;
403 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
406 if( fh.i_type == 'A' && p_sys->p_es_audio )
408 if( fh.i_compression == '3' )
409 es_out_Send( p_demux->out, p_sys->p_es_audio, p_data );
412 msg_Dbg( p_demux, "unsupported compression %c for audio (upload samples)", fh.i_compression );
413 block_Release( p_data );
416 else if( fh.i_type == 'V' && p_sys->p_es_video )
418 if( fh.i_compression >='0' && fh.i_compression <='3' )
420 /* for rtjpeg data, the header is also needed */
421 p_data = block_Realloc( p_data, NUV_FH_SIZE, fh.i_length );
422 memcpy( p_data->p_buffer, p_sys->fh_buffer, NUV_FH_SIZE );
424 /* 0,1,2,3 -> rtjpeg, >=4 mpeg4 */
425 if( fh.i_compression >= '0' )
426 es_out_Send( p_demux->out, p_sys->p_es_video, p_data );
429 msg_Dbg( p_demux, "unsupported compression %c for video (upload samples)", fh.i_compression );
430 block_Release( p_data );
435 block_Release( p_data );
441 /*****************************************************************************
443 *****************************************************************************/
444 static int Control( demux_t *p_demux, int i_query, va_list args )
446 demux_sys_t *p_sys = p_demux->p_sys;
454 case DEMUX_GET_POSITION:
455 pf = (double*)va_arg( args, double * );
457 if( p_sys->i_total_length > 0 && p_sys->i_pcr >= 0 )
459 *pf = (double)p_sys->i_pcr / (double)p_sys->i_total_length;
463 i64 = stream_Size( p_demux->s );
466 const double f_current = stream_Tell( p_demux->s );
467 *pf = f_current / (double)i64;
476 case DEMUX_SET_POSITION:
480 f = (double)va_arg( args, double );
484 /* first try to see if we can seek based on time (== GET_LENGTH works) */
485 if( p_sys->i_total_length > 0 && ( i_pos = demux_IndexConvertTime( &p_sys->idx, p_sys->i_total_length * f ) ) > 0 )
486 return ControlSetPosition( p_demux, i_pos, false );
488 /* if not search based on total stream size */
489 else if( ( i_pos = demux_IndexFindOffset( &p_sys->idx, stream_Size( p_demux->s ) * f ) ) >= 0 )
490 return ControlSetPosition( p_demux, i_pos, false );
492 else if( ( i_pos = p_sys->i_first_frame_offset + ( stream_Size( p_demux->s ) - p_sys->i_first_frame_offset ) * f ) >= 0 )
493 return ControlSetPosition( p_demux, i_pos, true );
500 pi64 = (int64_t*)va_arg( args, int64_t * );
501 *pi64 = p_sys->i_pcr >= 0 ? p_sys->i_pcr : 0;
507 i64 = (int64_t)va_arg( args, int64_t );
511 i_pos = demux_IndexConvertTime( &p_sys->idx, i64 );
515 return ControlSetPosition( p_demux, i_pos, false );
518 case DEMUX_GET_LENGTH:
519 pi64 = (int64_t*)va_arg( args, int64_t * );
520 if( p_sys->i_total_length >= 0 )
522 *pi64 = p_sys->i_total_length;
525 else if( stream_Tell( p_demux->s ) > p_sys->i_first_frame_offset )
527 /* This should give an approximation of the total duration */
528 *pi64 = (double)( stream_Size( p_demux->s ) - p_sys->i_first_frame_offset ) /
529 (double)( stream_Tell( p_demux->s ) - p_sys->i_first_frame_offset )
530 * (double)( p_sys->i_pcr >= 0 ? p_sys->i_pcr : 0 );
537 pf = (double*)va_arg( args, double * );
538 *pf = p_sys->hdr.d_fps;
547 static int ControlSetPosition( demux_t *p_demux, int64_t i_pos, bool b_guess )
549 demux_sys_t *p_sys = p_demux->p_sys;
554 /* if we can seek in the stream */
555 if( p_sys->b_seekable && !b_guess )
557 if( stream_Seek( p_demux->s, i_pos ) )
563 if( i_pos > stream_Tell( p_demux->s ) )
565 msg_Dbg( p_demux, "unable to seek, skipping frames (slow)" );
569 msg_Warn( p_demux, "unable to seek, only forward seeking is possible" );
575 while( vlc_object_alive (p_demux) )
580 if( ( i_tell = stream_Tell( p_demux->s ) ) >= i_pos )
583 if( FrameHeaderLoad( p_demux, &fh ) )
586 if( fh.i_type == 'A' || fh.i_type == 'V' )
588 if( !fh.i_keyframe && !p_sys->b_index )
589 demux_IndexAppend( &p_sys->idx,(int64_t)fh.i_timecode*1000, i_tell );
592 if( fh.i_type != 'R' && fh.i_length > 0 )
594 if( stream_Read( p_demux->s, NULL, fh.i_length ) != fh.i_length )
602 /*****************************************************************************
604 *****************************************************************************/
605 static inline void GetDoubleLE( double *pd, void *src )
607 /* FIXME works only if sizeof(double) == 8 */
608 #ifdef WORDS_BIGENDIAN
609 uint8_t *p = (uint8_t*)pd, *q = (uint8_t*)src;
611 for( i = 0; i < 8; i++ )
614 memcpy( pd, src, 8 );
620 static int HeaderLoad( demux_t *p_demux, header_t *h )
624 if( stream_Read( p_demux->s, buffer, 72 ) != 72 )
627 /* XXX: they are alignment to take care of (another broken format) */
628 memcpy( h->id, &buffer[ 0], 12 );
629 memcpy( h->version, &buffer[12], 5 );
630 h->i_width = GetDWLE( &buffer[20] );
631 h->i_height = GetDWLE( &buffer[24] );
632 h->i_width_desired = GetDWLE( &buffer[28] );
633 h->i_height_desired = GetDWLE( &buffer[32] );
634 h->i_mode = buffer[36];
635 GetDoubleLE( &h->d_aspect, &buffer[40] );
636 GetDoubleLE( &h->d_fps, &buffer[48] );
637 h->i_video_blocks = GetDWLE( &buffer[56] );
638 h->i_audio_blocks = GetDWLE( &buffer[60] );
639 h->i_text_blocks = GetDWLE( &buffer[64] );
640 h->i_keyframe_distance = GetDWLE( &buffer[68] );
642 msg_Dbg( p_demux, "nuv: h=%s v=%s %dx%d a=%f fps=%f v=%d a=%d t=%d kfd=%d",
643 h->id, h->version, h->i_width, h->i_height, h->d_aspect,
644 h->d_fps, h->i_video_blocks, h->i_audio_blocks, h->i_text_blocks,
645 h->i_keyframe_distance );
652 static int FrameHeaderLoad( demux_t *p_demux, frame_header_t *h )
654 uint8_t* buffer = p_demux->p_sys->fh_buffer;
656 if( stream_Read( p_demux->s, buffer, 12 ) != 12 )
659 h->i_type = buffer[0];
660 h->i_compression = buffer[1];
661 h->i_keyframe = buffer[2];
662 h->i_filters = buffer[3];
664 h->i_timecode = GetDWLE( &buffer[4] );
665 h->i_length = GetDWLE( &buffer[8] );
667 msg_Dbg( p_demux, "frame hdr: t=%c c=%c k=%d f=0x%x timecode=%d l=%d",
669 h->i_compression ? h->i_compression : ' ',
670 h->i_keyframe ? h->i_keyframe : ' ',
672 h->i_timecode, h->i_length );
677 static int ExtendedHeaderLoad( demux_t *p_demux, extended_header_t *h )
681 if( stream_Read( p_demux->s, buffer, 512 ) != 512 )
684 h->i_version = GetDWLE( &buffer[0] );
685 h->i_video_fcc = VLC_FOURCC( buffer[4], buffer[5], buffer[6], buffer[7] );
686 h->i_audio_fcc = VLC_FOURCC( buffer[8], buffer[9], buffer[10], buffer[11] );
687 h->i_audio_sample_rate = GetDWLE( &buffer[12] );
688 h->i_audio_bits_per_sample = GetDWLE( &buffer[16] );
689 h->i_audio_channels = GetDWLE( &buffer[20] );
690 h->i_audio_compression_ratio = GetDWLE( &buffer[24] );
691 h->i_audio_quality = GetDWLE( &buffer[28] );
692 h->i_rtjpeg_quality = GetDWLE( &buffer[32] );
693 h->i_rtjpeg_luma_filter = GetDWLE( &buffer[36] );
694 h->i_rtjpeg_chroma_filter = GetDWLE( &buffer[40] );
695 h->i_lavc_bitrate = GetDWLE( &buffer[44] );
696 h->i_lavc_qmin = GetDWLE( &buffer[48] );
697 h->i_lavc_qmin = GetDWLE( &buffer[52] );
698 h->i_lavc_maxqdiff = GetDWLE( &buffer[56] );
699 h->i_seektable_offset = GetQWLE( &buffer[60] );
700 h->i_keyframe_adjust_offset= GetQWLE( &buffer[68] );
702 msg_Dbg( p_demux, "ex hdr: v=%d vffc=%4.4s afcc=%4.4s %dHz %dbits ach=%d acr=%d aq=%d"
703 "rtjpeg q=%d lf=%d lc=%d lavc br=%d qmin=%d qmax=%d maxqdiff=%d seekableoff=%"PRIi64" keyfao=%"PRIi64,
705 (char*)&h->i_video_fcc,
706 (char*)&h->i_audio_fcc, h->i_audio_sample_rate, h->i_audio_bits_per_sample, h->i_audio_channels,
707 h->i_audio_compression_ratio, h->i_audio_quality,
708 h->i_rtjpeg_quality, h->i_rtjpeg_luma_filter, h->i_rtjpeg_chroma_filter,
709 h->i_lavc_bitrate, h->i_lavc_qmin, h->i_lavc_qmax, h->i_lavc_maxqdiff,
710 h->i_seektable_offset, h->i_keyframe_adjust_offset );
718 int64_t i_file_offset;
719 int32_t i_keyframe_number;
724 int32_t i_keyframe_number;
728 static int SeekTableLoad( demux_t *p_demux, demux_sys_t *p_sys )
731 int64_t i_original_pos;
732 int64_t i_time, i_offset;
733 int keyframe, last_keyframe = 0, frame = 0, kfa_entry_id = 0;
735 if( p_sys->exh.i_seektable_offset <= 0 )
738 /* Save current position */
739 i_original_pos = stream_Tell( p_demux->s );
741 msg_Dbg( p_demux, "current offset %"PRIi64, i_original_pos );
743 msg_Dbg( p_demux, "seeking in stream to %"PRIi64, p_sys->exh.i_seektable_offset );
745 if( stream_Seek( p_demux->s, p_sys->exh.i_seektable_offset ) )
748 if( FrameHeaderLoad( p_demux, &fh ) )
751 if( fh.i_type != 'Q' )
753 msg_Warn( p_demux, "invalid seektable, frame type=%c", fh.i_type );
754 stream_Seek( p_demux->s, i_original_pos );
759 uint8_t *p_seek_table = malloc( fh.i_length );
760 if( p_seek_table == NULL )
763 if( stream_Read( p_demux->s, p_seek_table, fh.i_length ) != fh.i_length )
765 free( p_seek_table );
768 const int32_t i_seek_elements = fh.i_length / 12;
770 /* Get keyframe adjust offsets */
771 int32_t i_kfa_elements;
772 uint8_t *p_kfa_table;
774 if( p_sys->exh.i_keyframe_adjust_offset > 0 )
776 msg_Dbg( p_demux, "seeking in stream to %"PRIi64, p_sys->exh.i_keyframe_adjust_offset );
777 if( stream_Seek( p_demux->s, p_sys->exh.i_keyframe_adjust_offset ) )
779 free( p_seek_table );
783 if( FrameHeaderLoad( p_demux, &fh ) )
785 free( p_seek_table );
789 if( fh.i_type == 'K' && fh.i_length >= 8 )
791 p_kfa_table = malloc( fh.i_length );
793 if( p_kfa_table == NULL )
795 free( p_seek_table );
799 if( stream_Read( p_demux->s, p_kfa_table, fh.i_length ) != fh.i_length )
801 free( p_seek_table );
806 i_kfa_elements = fh.i_length / 8;
815 if( i_kfa_elements > 0 )
816 msg_Warn( p_demux, "untested keyframe adjust support, upload samples" );
818 for( int32_t j = 0; j < i_seek_elements; j++)
821 uint8_t* p = p_seek_table + j * 12;
822 msg_Dbg( p_demux, "%x %x %x %x %x %x %x %x %x %x %x %x",
823 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9], p[10], p[11]);
825 keyframe = GetDWLE( p_seek_table + j * 12 + 8 );
827 frame += (keyframe - last_keyframe) * p_sys->hdr.i_keyframe_distance;
829 if( kfa_entry_id < i_kfa_elements && *(int32_t*)(p_kfa_table + kfa_entry_id * 12 + 4) == j )
831 frame -= *(int32_t*)(p_kfa_table + kfa_entry_id * 12);
832 msg_Dbg( p_demux, "corrected keyframe %d with current frame number %d (corrected with %d)",
833 keyframe, frame, *(int32_t*)(p_kfa_table + kfa_entry_id * 12) );
837 i_time = (double)( (int64_t)frame * 1000000 ) / p_sys->hdr.d_fps;
838 i_offset = GetQWLE( p_seek_table + j * 12 );
840 if( i_offset == 0 && i_time != 0 )
841 msg_Dbg( p_demux, "invalid file offset %d %"PRIi64, keyframe, i_offset );
844 demux_IndexAppend( &p_sys->idx, i_time , i_offset );
846 msg_Dbg( p_demux, "adding entry position %d %"PRIi64 " file offset %"PRIi64, keyframe, i_time, i_offset );
850 last_keyframe = keyframe;
853 p_sys->i_total_frames = (int64_t)frame;
855 p_sys->b_index = true;
857 p_sys->i_total_length = p_sys->i_total_frames * 1000000 / p_sys->hdr.d_fps;
859 msg_Dbg( p_demux, "index table loaded (%d elements)", i_seek_elements );
862 free ( p_kfa_table );
864 free ( p_seek_table );
866 /* Restore stream position */
867 if( stream_Seek( p_demux->s, i_original_pos ) )
874 /*****************************************************************************/
875 #define DEMUX_INDEX_SIZE_MAX (100000)
876 static void demux_IndexInit( demux_index_t *p_idx )
879 p_idx->i_idx_max = 0;
882 static void demux_IndexClean( demux_index_t *p_idx )
887 static void demux_IndexAppend( demux_index_t *p_idx,
888 int64_t i_time, int64_t i_offset )
890 /* Be sure to append new entry (we don't insert point) */
891 if( p_idx->i_idx > 0 && p_idx->idx[p_idx->i_idx-1].i_time >= i_time )
895 if( p_idx->i_idx >= p_idx->i_idx_max )
897 if( p_idx->i_idx >= DEMUX_INDEX_SIZE_MAX )
899 /* Avoid too big index */
900 const int64_t i_length = p_idx->idx[p_idx->i_idx-1].i_time -
901 p_idx->idx[0].i_time;
902 const int i_count = DEMUX_INDEX_SIZE_MAX/2;
905 /* We try to reduce the resolution of the index by a factor 2 */
906 for( i = 1, j = 1; i < p_idx->i_idx; i++ )
908 if( p_idx->idx[i].i_time < j * i_length / i_count )
911 p_idx->idx[j++] = p_idx->idx[i];
915 if( p_idx->i_idx > 3 * DEMUX_INDEX_SIZE_MAX / 4 )
917 /* We haven't created enough space
918 * (This method won't create a good index but work for sure) */
919 for( i = 0; i < p_idx->i_idx/2; i++ )
920 p_idx->idx[i] = p_idx->idx[2*i];
926 p_idx->i_idx_max += 1000;
927 p_idx->idx = xrealloc( p_idx->idx,
928 p_idx->i_idx_max*sizeof(demux_index_entry_t));
933 p_idx->idx[p_idx->i_idx].i_time = i_time;
934 p_idx->idx[p_idx->i_idx].i_offset = i_offset;
938 static int64_t demux_IndexConvertTime( demux_index_t *p_idx, int64_t i_time )
941 int i_max = p_idx->i_idx-1;
944 if( p_idx->i_idx <= 0 )
947 /* Special border case */
948 if( i_time <= p_idx->idx[0].i_time )
949 return p_idx->idx[0].i_offset;
950 if( i_time >= p_idx->idx[i_max].i_time )
951 return p_idx->idx[i_max].i_offset;
958 if( i_max - i_min <= 1 )
961 i_med = (i_min+i_max)/2;
962 if( p_idx->idx[i_med].i_time < i_time )
964 else if( p_idx->idx[i_med].i_time > i_time )
967 return p_idx->idx[i_med].i_offset;
970 /* return nearest in time */
971 if( i_time - p_idx->idx[i_min].i_time < p_idx->idx[i_max].i_time - i_time )
972 return p_idx->idx[i_min].i_offset;
974 return p_idx->idx[i_max].i_offset;
978 static int64_t demux_IndexFindOffset( demux_index_t *p_idx, int64_t i_offset )
981 int i_max = p_idx->i_idx-1;
984 if( p_idx->i_idx <= 0 )
987 /* Special border case */
988 if( i_offset <= p_idx->idx[0].i_offset )
989 return p_idx->idx[0].i_offset;
990 if( i_offset == p_idx->idx[i_max].i_offset )
991 return p_idx->idx[i_max].i_offset;
992 if( i_offset > p_idx->idx[i_max].i_offset )
1000 if( i_max - i_min <= 1 )
1003 i_med = (i_min+i_max)/2;
1004 if( p_idx->idx[i_med].i_offset < i_offset )
1006 else if( p_idx->idx[i_med].i_offset > i_offset )
1009 return p_idx->idx[i_med].i_offset;
1012 /* return nearest */
1013 if( i_offset - p_idx->idx[i_min].i_offset < p_idx->idx[i_max].i_offset - i_offset )
1014 return p_idx->idx[i_min].i_offset;
1016 return p_idx->idx[i_max].i_offset;