Cosmetics.
[vlc.git] / modules / demux / ogg.c
1 /*****************************************************************************
2  * ogg.c : ogg stream demux module for vlc
3  *****************************************************************************
4  * Copyright (C) 2001-2007 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
8  *          Andre Pang <Andre.Pang@csiro.au> (Annodex support)
9  *
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.
14  *
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.
19  *
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  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28 #ifdef HAVE_CONFIG_H
29 # include "config.h"
30 #endif
31
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
35 #include <vlc_meta.h>
36 #include <vlc_input.h>
37
38 #include <ogg/ogg.h>
39
40 #include <vlc_codecs.h>
41 #include <vlc_bits.h>
42
43 /*****************************************************************************
44  * Module descriptor
45  *****************************************************************************/
46 static int  Open ( vlc_object_t * );
47 static void Close( vlc_object_t * );
48
49 vlc_module_begin ()
50     set_shortname ( "OGG" )
51     set_description( N_("OGG demuxer" ) )
52     set_category( CAT_INPUT )
53     set_subcategory( SUBCAT_INPUT_DEMUX )
54     set_capability( "demux", 50 )
55     set_callbacks( Open, Close )
56     add_shortcut( "ogg" )
57 vlc_module_end ()
58
59
60 /*****************************************************************************
61  * Definitions of structures and functions used by this plugins
62  *****************************************************************************/
63 typedef struct logical_stream_s
64 {
65     ogg_stream_state os;                        /* logical stream of packets */
66
67     es_format_t      fmt;
68     es_format_t      fmt_old;                  /* format of old ES is reused */
69     es_out_id_t      *p_es;
70     double           f_rate;
71
72     int              i_serial_no;
73
74     /* the header of some logical streams (eg vorbis) contain essential
75      * data for the decoder. We back them up here in case we need to re-feed
76      * them to the decoder. */
77     int              b_force_backup;
78     int              i_packets_backup;
79     uint8_t          *p_headers;
80     int              i_headers;
81
82     /* program clock reference (in units of 90kHz) derived from the previous
83      * granulepos */
84     mtime_t          i_pcr;
85     mtime_t          i_interpolated_pcr;
86     mtime_t          i_previous_pcr;
87
88     /* Misc */
89     bool b_reinit;
90     int i_granule_shift;
91
92     /* kate streams have the number of headers in the ID header */
93     int i_kate_num_headers;
94
95     /* for Annodex logical bitstreams */
96     int i_secondary_header_packets;
97
98 } logical_stream_t;
99
100 struct demux_sys_t
101 {
102     ogg_sync_state oy;        /* sync and verify incoming physical bitstream */
103
104     int i_streams;                           /* number of logical bitstreams */
105     logical_stream_t **pp_stream;  /* pointer to an array of logical streams */
106
107     logical_stream_t *p_old_stream; /* pointer to a old logical stream to avoid recreating it */
108
109     /* program clock reference (in units of 90kHz) derived from the pcr of
110      * the sub-streams */
111     mtime_t i_pcr;
112
113     /* stream state */
114     int     i_bos;
115     int     i_eos;
116
117     /* bitrate */
118     int     i_bitrate;
119
120     /* after reading all headers, the first data page is stuffed into the relevant stream, ready to use */
121     bool    b_page_waiting;
122 };
123
124 /* OggDS headers for the new header format (used in ogm files) */
125 typedef struct
126 {
127     ogg_int32_t width;
128     ogg_int32_t height;
129 } stream_header_video_t;
130
131 typedef struct
132 {
133     ogg_int16_t channels;
134     ogg_int16_t padding;
135     ogg_int16_t blockalign;
136     ogg_int32_t avgbytespersec;
137 } stream_header_audio_t;
138
139 typedef struct
140 {
141     char        streamtype[8];
142     char        subtype[4];
143
144     ogg_int32_t size;                               /* size of the structure */
145
146     ogg_int64_t time_unit;                              /* in reference time */
147     ogg_int64_t samples_per_unit;
148     ogg_int32_t default_len;                                /* in media time */
149
150     ogg_int32_t buffersize;
151     ogg_int16_t bits_per_sample;
152     ogg_int16_t padding;
153
154     union
155     {
156         /* Video specific */
157         stream_header_video_t video;
158         /* Audio specific */
159         stream_header_audio_t audio;
160     } sh;
161 } stream_header_t;
162
163 #define OGG_BLOCK_SIZE 4096
164
165 /* Some defines from OggDS */
166 #define PACKET_TYPE_HEADER   0x01
167 #define PACKET_TYPE_BITS     0x07
168 #define PACKET_LEN_BITS01    0xc0
169 #define PACKET_LEN_BITS2     0x02
170 #define PACKET_IS_SYNCPOINT  0x08
171
172 /*****************************************************************************
173  * Local prototypes
174  *****************************************************************************/
175 static int  Demux  ( demux_t * );
176 static int  Control( demux_t *, int, va_list );
177
178 /* Bitstream manipulation */
179 static int  Ogg_ReadPage     ( demux_t *, ogg_page * );
180 static void Ogg_UpdatePCR    ( logical_stream_t *, ogg_packet * );
181 static void Ogg_DecodePacket ( demux_t *, logical_stream_t *, ogg_packet * );
182
183 static int Ogg_BeginningOfStream( demux_t *p_demux );
184 static int Ogg_FindLogicalStreams( demux_t *p_demux );
185 static void Ogg_EndOfStream( demux_t *p_demux );
186
187 /* */
188 static void Ogg_LogicalStreamDelete( demux_t *p_demux, logical_stream_t *p_stream );
189 static bool Ogg_LogicalStreamResetEsFormat( demux_t *p_demux, logical_stream_t *p_stream );
190
191 /* Logical bitstream headers */
192 static void Ogg_ReadTheoraHeader( logical_stream_t *, ogg_packet * );
193 static void Ogg_ReadVorbisHeader( logical_stream_t *, ogg_packet * );
194 static void Ogg_ReadSpeexHeader( logical_stream_t *, ogg_packet * );
195 static void Ogg_ReadKateHeader( logical_stream_t *, ogg_packet * );
196 static void Ogg_ReadFlacHeader( demux_t *, logical_stream_t *, ogg_packet * );
197 static void Ogg_ReadAnnodexHeader( vlc_object_t *, logical_stream_t *, ogg_packet * );
198 static void Ogg_ReadDiracHeader( logical_stream_t *, ogg_packet * );
199
200 /*****************************************************************************
201  * Open: initializes ogg demux structures
202  *****************************************************************************/
203 static int Open( vlc_object_t * p_this )
204 {
205     demux_t *p_demux = (demux_t *)p_this;
206     demux_sys_t    *p_sys;
207     const uint8_t  *p_peek;
208
209
210     /* Check if we are dealing with an ogg stream */
211     if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
212     if( !p_demux->b_force && memcmp( p_peek, "OggS", 4 ) )
213     {
214         return VLC_EGENERIC;
215     }
216
217     /* Set exported functions */
218     p_demux->pf_demux = Demux;
219     p_demux->pf_control = Control;
220     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
221     if( !p_sys )
222         return VLC_ENOMEM;
223
224     memset( p_sys, 0, sizeof( demux_sys_t ) );
225     p_sys->i_bitrate = 0;
226     p_sys->pp_stream = NULL;
227     p_sys->p_old_stream = NULL;
228
229     /* Begnning of stream, tell the demux to look for elementary streams. */
230     p_sys->i_bos = 0;
231     p_sys->i_eos = 0;
232
233     /* Initialize the Ogg physical bitstream parser */
234     ogg_sync_init( &p_sys->oy );
235     p_sys->b_page_waiting = false;
236
237     return VLC_SUCCESS;
238 }
239
240 /*****************************************************************************
241  * Close: frees unused data
242  *****************************************************************************/
243 static void Close( vlc_object_t *p_this )
244 {
245     demux_t *p_demux = (demux_t *)p_this;
246     demux_sys_t *p_sys = p_demux->p_sys  ;
247
248     /* Cleanup the bitstream parser */
249     ogg_sync_clear( &p_sys->oy );
250
251     Ogg_EndOfStream( p_demux );
252
253     if( p_sys->p_old_stream )
254         Ogg_LogicalStreamDelete( p_demux, p_sys->p_old_stream );
255
256     free( p_sys );
257 }
258
259 /*****************************************************************************
260  * Demux: reads and demuxes data packets
261  *****************************************************************************
262  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
263  *****************************************************************************/
264 static int Demux( demux_t * p_demux )
265 {
266     demux_sys_t *p_sys = p_demux->p_sys;
267     ogg_page    oggpage;
268     ogg_packet  oggpacket;
269     int         i_stream;
270
271
272     if( p_sys->i_eos == p_sys->i_streams )
273     {
274         if( p_sys->i_eos )
275         {
276             msg_Dbg( p_demux, "end of a group of logical streams" );
277             /* We keep the ES to try reusing it in Ogg_BeginningOfStream
278              * only 1 ES is supported (common case for ogg web radio) */
279             if( p_sys->i_streams == 1 )
280             {
281                 p_sys->p_old_stream = p_sys->pp_stream[0];
282                 TAB_CLEAN( p_sys->i_streams, p_sys->pp_stream );
283             }
284             Ogg_EndOfStream( p_demux );
285         }
286
287         p_sys->i_eos = 0;
288         if( Ogg_BeginningOfStream( p_demux ) != VLC_SUCCESS )
289             return 0;
290
291         msg_Dbg( p_demux, "beginning of a group of logical streams" );
292         es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
293     }
294
295     /*
296      * The first data page of a physical stream is stored in the relevant logical stream
297      * in Ogg_FindLogicalStreams. Therefore, we must not read a page and only update the
298      * stream it belongs to if we haven't processed this first page yet. If we do, we
299      * will only process that first page whenever we find the second page for this stream.
300      * While this is fine for Vorbis and Theora, which are continuous codecs, which means
301      * the second page will arrive real quick, this is not fine for Kate, whose second
302      * data page will typically arrive much later.
303      * This means it is now possible to seek right at the start of a stream where the last
304      * logical stream is Kate, without having to wait for the second data page to unblock
305      * the first one, which is the one that triggers the 'no more headers to backup' code.
306      * And, as we all know, seeking without having backed up all headers is bad, since the
307      * codec will fail to initialize if it's missing its headers.
308      */
309     if( !p_sys->b_page_waiting)
310     {
311         /*
312          * Demux an ogg page from the stream
313          */
314         if( Ogg_ReadPage( p_demux, &oggpage ) != VLC_SUCCESS )
315             return 0; /* EOF */
316
317         /* Test for End of Stream */
318         if( ogg_page_eos( &oggpage ) )
319             p_sys->i_eos++;
320     }
321
322
323     for( i_stream = 0; i_stream < p_sys->i_streams; i_stream++ )
324     {
325         logical_stream_t *p_stream = p_sys->pp_stream[i_stream];
326
327         /* if we've just pulled page, look for the right logical stream */
328         if( !p_sys->b_page_waiting )
329         {
330             if( ogg_stream_pagein( &p_stream->os, &oggpage ) != 0 )
331                 continue;
332         }
333
334         while( ogg_stream_packetout( &p_stream->os, &oggpacket ) > 0 )
335         {
336             /* Read info from any secondary header packets, if there are any */
337             if( p_stream->i_secondary_header_packets > 0 )
338             {
339                 if( p_stream->fmt.i_codec == VLC_FOURCC('t','h','e','o') &&
340                         oggpacket.bytes >= 7 &&
341                         ! memcmp( oggpacket.packet, "\x80theora", 7 ) )
342                 {
343                     Ogg_ReadTheoraHeader( p_stream, &oggpacket );
344                     p_stream->i_secondary_header_packets = 0;
345                 }
346                 else if( p_stream->fmt.i_codec == VLC_FOURCC('v','o','r','b') &&
347                         oggpacket.bytes >= 7 &&
348                         ! memcmp( oggpacket.packet, "\x01vorbis", 7 ) )
349                 {
350                     Ogg_ReadVorbisHeader( p_stream, &oggpacket );
351                     p_stream->i_secondary_header_packets = 0;
352                 }
353                 else if( p_stream->fmt.i_codec == VLC_FOURCC('c','m','m','l') )
354                 {
355                     p_stream->i_secondary_header_packets = 0;
356                 }
357             }
358
359             if( p_stream->b_reinit )
360             {
361                 /* If synchro is re-initialized we need to drop all the packets
362                  * until we find a new dated one. */
363                 Ogg_UpdatePCR( p_stream, &oggpacket );
364
365                 if( p_stream->i_pcr >= 0 )
366                 {
367                     p_stream->b_reinit = false;
368                 }
369                 else
370                 {
371                     p_stream->i_interpolated_pcr = -1;
372                     continue;
373                 }
374
375                 /* An Ogg/vorbis packet contains an end date granulepos */
376                 if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) ||
377                     p_stream->fmt.i_codec == VLC_FOURCC( 's','p','x',' ' ) ||
378                     p_stream->fmt.i_codec == VLC_FOURCC( 'f','l','a','c' ) )
379                 {
380                     if( ogg_stream_packetout( &p_stream->os, &oggpacket ) > 0 )
381                     {
382                         Ogg_DecodePacket( p_demux, p_stream, &oggpacket );
383                     }
384                     else
385                     {
386                         es_out_Control( p_demux->out, ES_OUT_SET_PCR,
387                                         p_stream->i_pcr );
388                     }
389                     continue;
390                 }
391             }
392
393             Ogg_DecodePacket( p_demux, p_stream, &oggpacket );
394         }
395
396         if( !p_sys->b_page_waiting )
397             break;
398     }
399
400     /* if a page was waiting, it's now processed */
401     p_sys->b_page_waiting = false;
402
403     p_sys->i_pcr = -1;
404     for( i_stream = 0; i_stream < p_sys->i_streams; i_stream++ )
405     {
406         logical_stream_t *p_stream = p_sys->pp_stream[i_stream];
407
408         if( p_stream->fmt.i_cat == SPU_ES )
409             continue;
410         if( p_stream->i_interpolated_pcr < 0 )
411             continue;
412
413         if( p_sys->i_pcr < 0 || p_stream->i_interpolated_pcr < p_sys->i_pcr )
414             p_sys->i_pcr = p_stream->i_interpolated_pcr;
415     }
416
417     if( p_sys->i_pcr >= 0 )
418         es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
419
420     return 1;
421 }
422
423 /*****************************************************************************
424  * Control:
425  *****************************************************************************/
426 static int Control( demux_t *p_demux, int i_query, va_list args )
427 {
428     demux_sys_t *p_sys  = p_demux->p_sys;
429     int64_t *pi64;
430     bool *pb_bool;
431     int i;
432
433     switch( i_query )
434     {
435         case DEMUX_HAS_UNSUPPORTED_META:
436             pb_bool = (bool*)va_arg( args, bool* );
437             *pb_bool = true;
438             return VLC_SUCCESS;
439
440         case DEMUX_GET_TIME:
441             pi64 = (int64_t*)va_arg( args, int64_t * );
442             *pi64 = p_sys->i_pcr;
443             return VLC_SUCCESS;
444
445         case DEMUX_SET_TIME:
446             return VLC_EGENERIC;
447
448         case DEMUX_SET_POSITION:
449             /* forbid seeking if we haven't initialized all logical bitstreams yet;
450                if we allowed, some headers would not get backed up and decoder init
451                would fail, making that logical stream unusable */
452             if( p_sys->i_bos > 0 )
453             {
454                 return VLC_EGENERIC;
455             }
456
457             for( i = 0; i < p_sys->i_streams; i++ )
458             {
459                 logical_stream_t *p_stream = p_sys->pp_stream[i];
460
461                 /* we'll trash all the data until we find the next pcr */
462                 p_stream->b_reinit = true;
463                 p_stream->i_pcr = -1;
464                 p_stream->i_interpolated_pcr = -1;
465                 ogg_stream_reset( &p_stream->os );
466             }
467             ogg_sync_reset( &p_sys->oy );
468             /* XXX The break/return is missing on purpose as
469              * demux_vaControlHelper will do the last part of the job */
470
471         default:
472             return demux_vaControlHelper( p_demux->s, 0, -1, p_sys->i_bitrate,
473                                            1, i_query, args );
474     }
475 }
476
477 /****************************************************************************
478  * Ogg_ReadPage: Read a full Ogg page from the physical bitstream.
479  ****************************************************************************
480  * Returns VLC_SUCCESS if a page has been read. An error might happen if we
481  * are at the end of stream.
482  ****************************************************************************/
483 static int Ogg_ReadPage( demux_t *p_demux, ogg_page *p_oggpage )
484 {
485     demux_sys_t *p_ogg = p_demux->p_sys  ;
486     int i_read = 0;
487     char *p_buffer;
488
489     while( ogg_sync_pageout( &p_ogg->oy, p_oggpage ) != 1 )
490     {
491         p_buffer = ogg_sync_buffer( &p_ogg->oy, OGG_BLOCK_SIZE );
492
493         i_read = stream_Read( p_demux->s, p_buffer, OGG_BLOCK_SIZE );
494         if( i_read <= 0 )
495             return VLC_EGENERIC;
496
497         ogg_sync_wrote( &p_ogg->oy, i_read );
498     }
499
500     return VLC_SUCCESS;
501 }
502
503 /****************************************************************************
504  * Ogg_UpdatePCR: update the PCR (90kHz program clock reference) for the
505  *                current stream.
506  ****************************************************************************/
507 static void Ogg_UpdatePCR( logical_stream_t *p_stream,
508                            ogg_packet *p_oggpacket )
509 {
510     /* Convert the granulepos into a pcr */
511     if( p_oggpacket->granulepos >= 0 )
512     {
513         if( p_stream->fmt.i_codec == VLC_FOURCC( 't','h','e','o' ) ||
514             p_stream->fmt.i_codec == VLC_FOURCC( 'k','a','t','e' ) )
515         {
516             ogg_int64_t iframe = p_oggpacket->granulepos >>
517               p_stream->i_granule_shift;
518             ogg_int64_t pframe = p_oggpacket->granulepos -
519               ( iframe << p_stream->i_granule_shift );
520
521             p_stream->i_pcr = ( iframe + pframe ) * INT64_C(1000000)
522                               / p_stream->f_rate;
523         }
524         else if( p_stream->fmt.i_codec == VLC_FOURCC( 'd','r','a','c' ) )
525         {
526             ogg_int64_t i_dts = p_oggpacket->granulepos >> 31;
527             /* NB, OggDirac granulepos values are in units of 2*picturerate */
528             p_stream->i_pcr = (i_dts/2) * INT64_C(1000000) / p_stream->f_rate;
529         }
530         else
531         {
532             p_stream->i_pcr = p_oggpacket->granulepos * INT64_C(1000000)
533                               / p_stream->f_rate;
534         }
535
536         p_stream->i_interpolated_pcr = p_stream->i_pcr;
537     }
538     else
539     {
540         p_stream->i_pcr = -1;
541
542         /* no granulepos available, try to interpolate the pcr.
543          * If we can't then don't touch the old value. */
544         if( p_stream->fmt.i_cat == VIDEO_ES )
545             /* 1 frame per packet */
546             p_stream->i_interpolated_pcr += (INT64_C(1000000) / p_stream->f_rate);
547         else if( p_stream->fmt.i_bitrate )
548             p_stream->i_interpolated_pcr +=
549                 ( p_oggpacket->bytes * INT64_C(1000000) /
550                   p_stream->fmt.i_bitrate / 8 );
551     }
552 }
553
554 /****************************************************************************
555  * Ogg_DecodePacket: Decode an Ogg packet.
556  ****************************************************************************/
557 static void Ogg_DecodePacket( demux_t *p_demux,
558                               logical_stream_t *p_stream,
559                               ogg_packet *p_oggpacket )
560 {
561     block_t *p_block;
562     bool b_selected;
563     int i_header_len = 0;
564     mtime_t i_pts = -1, i_interpolated_pts;
565     demux_sys_t *p_ogg = p_demux->p_sys;
566
567     /* Sanity check */
568     if( !p_oggpacket->bytes )
569     {
570         msg_Dbg( p_demux, "discarding 0 sized packet" );
571         return;
572     }
573
574     if( p_oggpacket->bytes >= 7 &&
575         ! memcmp ( p_oggpacket->packet, "Annodex", 7 ) )
576     {
577         /* it's an Annodex packet -- skip it (do nothing) */
578         return;
579     }
580     else if( p_oggpacket->bytes >= 7 &&
581         ! memcmp ( p_oggpacket->packet, "AnxData", 7 ) )
582     {
583         /* it's an AnxData packet -- skip it (do nothing) */
584         return;
585     }
586
587     if( p_stream->fmt.i_codec == VLC_FOURCC( 's','u','b','t' ) &&
588         p_oggpacket->packet[0] & PACKET_TYPE_BITS ) return;
589
590     /* Check the ES is selected */
591     es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE,
592                     p_stream->p_es, &b_selected );
593
594     if( p_stream->b_force_backup )
595     {
596         uint8_t *p_sav;
597         bool b_store_size = true;
598         bool b_store_num_headers = false;
599
600         p_stream->i_packets_backup++;
601         switch( p_stream->fmt.i_codec )
602         {
603         case VLC_FOURCC( 'v','o','r','b' ):
604         case VLC_FOURCC( 's','p','x',' ' ):
605         case VLC_FOURCC( 't','h','e','o' ):
606             if( p_stream->i_packets_backup == 3 ) p_stream->b_force_backup = 0;
607             break;
608
609         case VLC_FOURCC( 'f','l','a','c' ):
610             if( !p_stream->fmt.audio.i_rate && p_stream->i_packets_backup == 2 )
611             {
612                 Ogg_ReadFlacHeader( p_demux, p_stream, p_oggpacket );
613                 p_stream->b_force_backup = 0;
614             }
615             else if( p_stream->fmt.audio.i_rate )
616             {
617                 p_stream->b_force_backup = 0;
618                 if( p_oggpacket->bytes >= 9 )
619                 {
620                     p_oggpacket->packet += 9;
621                     p_oggpacket->bytes -= 9;
622                 }
623             }
624             b_store_size = false;
625             break;
626
627         case VLC_FOURCC( 'k','a','t','e' ):
628             if( p_stream->i_packets_backup == 1)
629                 b_store_num_headers = true;
630             if( p_stream->i_packets_backup == p_stream->i_kate_num_headers ) p_stream->b_force_backup = 0;
631             break;
632
633         default:
634             p_stream->b_force_backup = 0;
635             break;
636         }
637
638         /* Backup the ogg packet (likely an header packet) */
639         p_stream->p_headers =
640             realloc( p_sav = p_stream->p_headers, p_stream->i_headers +
641                      p_oggpacket->bytes + (b_store_size ? 2 : 0) + (b_store_num_headers ? 1 : 0) );
642         if( p_stream->p_headers )
643         {
644             uint8_t *p_extra = p_stream->p_headers + p_stream->i_headers;
645
646             if( b_store_num_headers )
647             {
648                 /* Kate streams store the number of headers in the first header,
649                    so we can't just test for 3 as Vorbis/Theora */
650                 *(p_extra++) = p_stream->i_kate_num_headers;
651             }
652             if( b_store_size )
653             {
654                 *(p_extra++) = p_oggpacket->bytes >> 8;
655                 *(p_extra++) = p_oggpacket->bytes & 0xFF;
656             }
657             memcpy( p_extra, p_oggpacket->packet, p_oggpacket->bytes );
658             p_stream->i_headers += p_oggpacket->bytes + (b_store_size ? 2 : 0) + (b_store_num_headers ? 1 : 0);
659
660             if( !p_stream->b_force_backup )
661             {
662                 /* Last header received, commit changes */
663                 free( p_stream->fmt.p_extra );
664
665                 p_stream->fmt.i_extra = p_stream->i_headers;
666                 p_stream->fmt.p_extra = malloc( p_stream->i_headers );
667                 if( p_stream->fmt.p_extra )
668                     memcpy( p_stream->fmt.p_extra, p_stream->p_headers,
669                             p_stream->i_headers );
670                 else
671                     p_stream->fmt.i_extra = 0;
672
673                 if( Ogg_LogicalStreamResetEsFormat( p_demux, p_stream ) )
674                     es_out_Control( p_demux->out, ES_OUT_SET_ES_FMT,
675                                     p_stream->p_es, &p_stream->fmt );
676
677                 /* we're not at BOS anymore for this logical stream */
678                 p_ogg->i_bos--;
679             }
680         }
681         else
682         {
683                 p_stream->p_headers = p_sav;
684         }
685
686         b_selected = false; /* Discard the header packet */
687     }
688
689     /* Convert the pcr into a pts */
690     if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) ||
691         p_stream->fmt.i_codec == VLC_FOURCC( 's','p','x',' ' ) ||
692         p_stream->fmt.i_codec == VLC_FOURCC( 'f','l','a','c' ) )
693     {
694         if( p_stream->i_pcr >= 0 )
695         {
696             /* This is for streams where the granulepos of the header packets
697              * doesn't match these of the data packets (eg. ogg web radios). */
698             if( p_stream->i_previous_pcr == 0 &&
699                 p_stream->i_pcr  > 3 * DEFAULT_PTS_DELAY )
700             {
701                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
702
703                 /* Call the pace control */
704                 es_out_Control( p_demux->out, ES_OUT_SET_PCR,
705                                 p_stream->i_pcr );
706             }
707
708             p_stream->i_previous_pcr = p_stream->i_pcr;
709
710             /* The granulepos is the end date of the sample */
711             i_pts =  p_stream->i_pcr;
712         }
713     }
714
715     /* Convert the granulepos into the next pcr */
716     i_interpolated_pts = p_stream->i_interpolated_pcr;
717     Ogg_UpdatePCR( p_stream, p_oggpacket );
718
719     /* SPU streams are typically discontinuous, do not mind large gaps */
720     if( p_stream->fmt.i_cat != SPU_ES )
721     {
722         if( p_stream->i_pcr >= 0 )
723         {
724             /* This is for streams where the granulepos of the header packets
725              * doesn't match these of the data packets (eg. ogg web radios). */
726             if( p_stream->i_previous_pcr == 0 &&
727                 p_stream->i_pcr  > 3 * DEFAULT_PTS_DELAY )
728             {
729                 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
730
731                 /* Call the pace control */
732                 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_stream->i_pcr );
733             }
734         }
735     }
736
737     if( p_stream->fmt.i_codec != VLC_FOURCC( 'v','o','r','b' ) &&
738         p_stream->fmt.i_codec != VLC_FOURCC( 's','p','x',' ' ) &&
739         p_stream->fmt.i_codec != VLC_FOURCC( 'f','l','a','c' ) &&
740         p_stream->i_pcr >= 0 )
741     {
742         p_stream->i_previous_pcr = p_stream->i_pcr;
743
744         /* The granulepos is the start date of the sample */
745         i_pts = p_stream->i_pcr;
746     }
747
748     if( !b_selected )
749     {
750         /* This stream isn't currently selected so we don't need to decode it,
751          * but we did need to store its pcr as it might be selected later on */
752         return;
753     }
754
755     if( p_oggpacket->bytes <= 0 )
756         return;
757
758     if( !( p_block = block_New( p_demux, p_oggpacket->bytes ) ) ) return;
759
760     /* Normalize PTS */
761     if( i_pts == 0 ) i_pts = 1;
762     else if( i_pts == -1 && i_interpolated_pts == 0 ) i_pts = 1;
763     else if( i_pts == -1 ) i_pts = 0;
764
765     if( p_stream->fmt.i_cat == AUDIO_ES )
766         p_block->i_dts = p_block->i_pts = i_pts;
767     else if( p_stream->fmt.i_cat == SPU_ES )
768     {
769         p_block->i_dts = p_block->i_pts = i_pts;
770         p_block->i_length = 0;
771     }
772     else if( p_stream->fmt.i_codec == VLC_FOURCC( 't','h','e','o' ) )
773         p_block->i_dts = p_block->i_pts = i_pts;
774     else if( p_stream->fmt.i_codec == VLC_FOURCC( 'd','r','a','c' ) )
775     {
776         ogg_int64_t dts = p_oggpacket->granulepos >> 31;
777         ogg_int64_t delay = (p_oggpacket->granulepos >> 9) & 0x1fff;
778
779         uint64_t u_pnum = dts + delay;
780
781         p_block->i_dts = p_stream->i_pcr;
782         p_block->i_pts = 0;
783         /* NB, OggDirac granulepos values are in units of 2*picturerate */
784         if( -1 != p_oggpacket->granulepos )
785             p_block->i_pts = u_pnum * INT64_C(1000000) / p_stream->f_rate / 2;
786     }
787     else
788     {
789         p_block->i_dts = i_pts;
790         p_block->i_pts = 0;
791     }
792
793     if( p_stream->fmt.i_codec != VLC_FOURCC( 'v','o','r','b' ) &&
794         p_stream->fmt.i_codec != VLC_FOURCC( 's','p','x',' ' ) &&
795         p_stream->fmt.i_codec != VLC_FOURCC( 'f','l','a','c' ) &&
796         p_stream->fmt.i_codec != VLC_FOURCC( 't','a','r','k' ) &&
797         p_stream->fmt.i_codec != VLC_FOURCC( 't','h','e','o' ) &&
798         p_stream->fmt.i_codec != VLC_FOURCC( 'c','m','m','l' ) &&
799         p_stream->fmt.i_codec != VLC_FOURCC( 'd','r','a','c' ) &&
800         p_stream->fmt.i_codec != VLC_FOURCC( 'k','a','t','e' ) )
801     {
802         /* We remove the header from the packet */
803         i_header_len = (*p_oggpacket->packet & PACKET_LEN_BITS01) >> 6;
804         i_header_len |= (*p_oggpacket->packet & PACKET_LEN_BITS2) << 1;
805
806         if( p_stream->fmt.i_codec == VLC_FOURCC( 's','u','b','t' ))
807         {
808             /* But with subtitles we need to retrieve the duration first */
809             int i, lenbytes = 0;
810
811             if( i_header_len > 0 && p_oggpacket->bytes >= i_header_len + 1 )
812             {
813                 for( i = 0, lenbytes = 0; i < i_header_len; i++ )
814                 {
815                     lenbytes = lenbytes << 8;
816                     lenbytes += *(p_oggpacket->packet + i_header_len - i);
817                 }
818             }
819             if( p_oggpacket->bytes - 1 - i_header_len > 2 ||
820                 ( p_oggpacket->packet[i_header_len + 1] != ' ' &&
821                   p_oggpacket->packet[i_header_len + 1] != 0 &&
822                   p_oggpacket->packet[i_header_len + 1] != '\n' &&
823                   p_oggpacket->packet[i_header_len + 1] != '\r' ) )
824             {
825                 p_block->i_length = (mtime_t)lenbytes * 1000;
826             }
827         }
828
829         i_header_len++;
830         if( p_block->i_buffer >= (unsigned int)i_header_len )
831             p_block->i_buffer -= i_header_len;
832         else
833             p_block->i_buffer = 0;
834     }
835
836     if( p_stream->fmt.i_codec == VLC_FOURCC( 't','a','r','k' ) )
837     {
838         /* FIXME: the biggest hack I've ever done */
839         msg_Warn( p_demux, "tarkin pts: %"PRId64", granule: %"PRId64,
840                   p_block->i_pts, p_block->i_dts );
841         msleep(10000);
842     }
843
844     memcpy( p_block->p_buffer, p_oggpacket->packet + i_header_len,
845             p_oggpacket->bytes - i_header_len );
846
847     es_out_Send( p_demux->out, p_stream->p_es, p_block );
848 }
849
850 /****************************************************************************
851  * Ogg_FindLogicalStreams: Find the logical streams embedded in the physical
852  *                         stream and fill p_ogg.
853  *****************************************************************************
854  * The initial page of a logical stream is marked as a 'bos' page.
855  * Furthermore, the Ogg specification mandates that grouped bitstreams begin
856  * together and all of the initial pages must appear before any data pages.
857  *
858  * On success this function returns VLC_SUCCESS.
859  ****************************************************************************/
860 static int Ogg_FindLogicalStreams( demux_t *p_demux )
861 {
862     demux_sys_t *p_ogg = p_demux->p_sys  ;
863     ogg_packet oggpacket;
864     ogg_page oggpage;
865     int i_stream;
866
867     while( Ogg_ReadPage( p_demux, &oggpage ) == VLC_SUCCESS )
868     {
869         if( ogg_page_bos( &oggpage ) )
870         {
871
872             /* All is wonderful in our fine fine little world.
873              * We found the beginning of our first logical stream. */
874             while( ogg_page_bos( &oggpage ) )
875             {
876                 logical_stream_t **pp_sav = p_ogg->pp_stream;
877                 logical_stream_t *p_stream;
878
879                 p_stream = malloc( sizeof(logical_stream_t) );
880                 if( !p_stream )
881                     return VLC_ENOMEM;
882
883                 TAB_APPEND( p_ogg->i_streams, p_ogg->pp_stream, p_stream );
884
885                 memset( p_stream, 0, sizeof(logical_stream_t) );
886                 p_stream->p_headers = 0;
887                 p_stream->i_secondary_header_packets = 0;
888
889                 es_format_Init( &p_stream->fmt, 0, 0 );
890                 es_format_Init( &p_stream->fmt_old, 0, 0 );
891
892                 /* Setup the logical stream */
893                 p_stream->i_serial_no = ogg_page_serialno( &oggpage );
894                 ogg_stream_init( &p_stream->os, p_stream->i_serial_no );
895
896                 /* Extract the initial header from the first page and verify
897                  * the codec type of this Ogg bitstream */
898                 if( ogg_stream_pagein( &p_stream->os, &oggpage ) < 0 )
899                 {
900                     /* error. stream version mismatch perhaps */
901                     msg_Err( p_demux, "error reading first page of "
902                              "Ogg bitstream data" );
903                     return VLC_EGENERIC;
904                 }
905
906                 /* FIXME: check return value */
907                 ogg_stream_packetpeek( &p_stream->os, &oggpacket );
908
909                 /* Check for Vorbis header */
910                 if( oggpacket.bytes >= 7 &&
911                     ! memcmp( oggpacket.packet, "\x01vorbis", 7 ) )
912                 {
913                     Ogg_ReadVorbisHeader( p_stream, &oggpacket );
914                     msg_Dbg( p_demux, "found vorbis header" );
915                 }
916                 /* Check for Speex header */
917                 else if( oggpacket.bytes >= 5 &&
918                     ! memcmp( oggpacket.packet, "Speex", 5 ) )
919                 {
920                     Ogg_ReadSpeexHeader( p_stream, &oggpacket );
921                     msg_Dbg( p_demux, "found speex header, channels: %i, "
922                              "rate: %i,  bitrate: %i",
923                              p_stream->fmt.audio.i_channels,
924                              (int)p_stream->f_rate, p_stream->fmt.i_bitrate );
925                 }
926                 /* Check for Flac header (< version 1.1.1) */
927                 else if( oggpacket.bytes >= 4 &&
928                     ! memcmp( oggpacket.packet, "fLaC", 4 ) )
929                 {
930                     msg_Dbg( p_demux, "found FLAC header" );
931
932                     /* Grrrr!!!! Did they really have to put all the
933                      * important info in the second header packet!!!
934                      * (STREAMINFO metadata is in the following packet) */
935                     p_stream->b_force_backup = 1;
936
937                     p_stream->fmt.i_cat = AUDIO_ES;
938                     p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
939                 }
940                 /* Check for Flac header (>= version 1.1.1) */
941                 else if( oggpacket.bytes >= 13 && oggpacket.packet[0] ==0x7F &&
942                     ! memcmp( &oggpacket.packet[1], "FLAC", 4 ) &&
943                     ! memcmp( &oggpacket.packet[9], "fLaC", 4 ) )
944                 {
945                     int i_packets = ((int)oggpacket.packet[7]) << 8 |
946                         oggpacket.packet[8];
947                     msg_Dbg( p_demux, "found FLAC header version %i.%i "
948                              "(%i header packets)",
949                              oggpacket.packet[5], oggpacket.packet[6],
950                              i_packets );
951
952                     p_stream->b_force_backup = 1;
953
954                     p_stream->fmt.i_cat = AUDIO_ES;
955                     p_stream->fmt.i_codec = VLC_FOURCC( 'f','l','a','c' );
956                     oggpacket.packet += 13; oggpacket.bytes -= 13;
957                     Ogg_ReadFlacHeader( p_demux, p_stream, &oggpacket );
958                 }
959                 /* Check for Theora header */
960                 else if( oggpacket.bytes >= 7 &&
961                          ! memcmp( oggpacket.packet, "\x80theora", 7 ) )
962                 {
963                     Ogg_ReadTheoraHeader( p_stream, &oggpacket );
964
965                     msg_Dbg( p_demux,
966                              "found theora header, bitrate: %i, rate: %f",
967                              p_stream->fmt.i_bitrate, p_stream->f_rate );
968                 }
969                 /* Check for Dirac header */
970                 else if( oggpacket.bytes >= 5 &&
971                          ! memcmp( oggpacket.packet, "BBCD\x00", 5 ) )
972                 {
973                     Ogg_ReadDiracHeader( p_stream, &oggpacket );
974                     msg_Dbg( p_demux, "found dirac header" );
975                 }
976                 /* Check for Tarkin header */
977                 else if( oggpacket.bytes >= 7 &&
978                          ! memcmp( &oggpacket.packet[1], "tarkin", 6 ) )
979                 {
980                     oggpack_buffer opb;
981
982                     msg_Dbg( p_demux, "found tarkin header" );
983                     p_stream->fmt.i_cat = VIDEO_ES;
984                     p_stream->fmt.i_codec = VLC_FOURCC( 't','a','r','k' );
985
986                     /* Cheat and get additionnal info ;) */
987                     oggpack_readinit( &opb, oggpacket.packet, oggpacket.bytes);
988                     oggpack_adv( &opb, 88 );
989                     oggpack_adv( &opb, 104 );
990                     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
991                     p_stream->f_rate = 2; /* FIXME */
992                     msg_Dbg( p_demux,
993                              "found tarkin header, bitrate: %i, rate: %f",
994                              p_stream->fmt.i_bitrate, p_stream->f_rate );
995                 }
996                 /* Check for Annodex header */
997                 else if( oggpacket.bytes >= 7 &&
998                          ! memcmp( oggpacket.packet, "Annodex", 7 ) )
999                 {
1000                     Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
1001                                            &oggpacket );
1002                     /* kill annodex track */
1003                     free( p_stream );
1004                     p_ogg->i_streams--;
1005                 }
1006                 /* Check for Annodex header */
1007                 else if( oggpacket.bytes >= 7 &&
1008                          ! memcmp( oggpacket.packet, "AnxData", 7 ) )
1009                 {
1010                     Ogg_ReadAnnodexHeader( VLC_OBJECT(p_demux), p_stream,
1011                                            &oggpacket );
1012                 }
1013                 /* Check for Kate header */
1014                 else if( oggpacket.bytes >= 8 &&
1015                     ! memcmp( &oggpacket.packet[1], "kate\0\0\0", 7 ) )
1016                 {
1017                     Ogg_ReadKateHeader( p_stream, &oggpacket );
1018                     msg_Dbg( p_demux, "found kate header" );
1019                 }
1020                 else if( oggpacket.bytes >= 142 &&
1021                          !memcmp( &oggpacket.packet[1],
1022                                    "Direct Show Samples embedded in Ogg", 35 ))
1023                 {
1024                     /* Old header type */
1025
1026                     /* Check for video header (old format) */
1027                     if( GetDWLE((oggpacket.packet+96)) == 0x05589f80 &&
1028                         oggpacket.bytes >= 184 )
1029                     {
1030                         p_stream->fmt.i_cat = VIDEO_ES;
1031                         p_stream->fmt.i_codec =
1032                             VLC_FOURCC( oggpacket.packet[68],
1033                                         oggpacket.packet[69],
1034                                         oggpacket.packet[70],
1035                                         oggpacket.packet[71] );
1036                         msg_Dbg( p_demux, "found video header of type: %.4s",
1037                                  (char *)&p_stream->fmt.i_codec );
1038
1039                         p_stream->fmt.video.i_frame_rate = 10000000;
1040                         p_stream->fmt.video.i_frame_rate_base =
1041                             GetQWLE((oggpacket.packet+164));
1042                         p_stream->f_rate = 10000000.0 /
1043                             GetQWLE((oggpacket.packet+164));
1044                         p_stream->fmt.video.i_bits_per_pixel =
1045                             GetWLE((oggpacket.packet+182));
1046                         if( !p_stream->fmt.video.i_bits_per_pixel )
1047                             /* hack, FIXME */
1048                             p_stream->fmt.video.i_bits_per_pixel = 24;
1049                         p_stream->fmt.video.i_width =
1050                             GetDWLE((oggpacket.packet+176));
1051                         p_stream->fmt.video.i_height =
1052                             GetDWLE((oggpacket.packet+180));
1053
1054                         msg_Dbg( p_demux,
1055                                  "fps: %f, width:%i; height:%i, bitcount:%i",
1056                                  p_stream->f_rate,
1057                                  p_stream->fmt.video.i_width,
1058                                  p_stream->fmt.video.i_height,
1059                                  p_stream->fmt.video.i_bits_per_pixel);
1060
1061                     }
1062                     /* Check for audio header (old format) */
1063                     else if( GetDWLE((oggpacket.packet+96)) == 0x05589F81 )
1064                     {
1065                         unsigned int i_extra_size;
1066                         unsigned int i_format_tag;
1067
1068                         p_stream->fmt.i_cat = AUDIO_ES;
1069
1070                         i_extra_size = GetWLE((oggpacket.packet+140));
1071                         if( i_extra_size > 0 && i_extra_size < oggpacket.bytes - 142 )
1072                         {
1073                             p_stream->fmt.i_extra = i_extra_size;
1074                             p_stream->fmt.p_extra = malloc( i_extra_size );
1075                             if( p_stream->fmt.p_extra )
1076                                 memcpy( p_stream->fmt.p_extra,
1077                                         oggpacket.packet + 142, i_extra_size );
1078                             else
1079                                 p_stream->fmt.i_extra = 0;
1080                         }
1081
1082                         i_format_tag = GetWLE((oggpacket.packet+124));
1083                         p_stream->fmt.audio.i_channels =
1084                             GetWLE((oggpacket.packet+126));
1085                         p_stream->f_rate = p_stream->fmt.audio.i_rate =
1086                             GetDWLE((oggpacket.packet+128));
1087                         p_stream->fmt.i_bitrate =
1088                             GetDWLE((oggpacket.packet+132)) * 8;
1089                         p_stream->fmt.audio.i_blockalign =
1090                             GetWLE((oggpacket.packet+136));
1091                         p_stream->fmt.audio.i_bitspersample =
1092                             GetWLE((oggpacket.packet+138));
1093
1094                         wf_tag_to_fourcc( i_format_tag,
1095                                           &p_stream->fmt.i_codec, 0 );
1096
1097                         if( p_stream->fmt.i_codec ==
1098                             VLC_FOURCC('u','n','d','f') )
1099                         {
1100                             p_stream->fmt.i_codec = VLC_FOURCC( 'm', 's',
1101                                 ( i_format_tag >> 8 ) & 0xff,
1102                                 i_format_tag & 0xff );
1103                         }
1104
1105                         msg_Dbg( p_demux, "found audio header of type: %.4s",
1106                                  (char *)&p_stream->fmt.i_codec );
1107                         msg_Dbg( p_demux, "audio:0x%4.4x channels:%d %dHz "
1108                                  "%dbits/sample %dkb/s",
1109                                  i_format_tag,
1110                                  p_stream->fmt.audio.i_channels,
1111                                  p_stream->fmt.audio.i_rate,
1112                                  p_stream->fmt.audio.i_bitspersample,
1113                                  p_stream->fmt.i_bitrate / 1024 );
1114
1115                     }
1116                     else
1117                     {
1118                         msg_Dbg( p_demux, "stream %d has an old header "
1119                             "but is of an unknown type", p_ogg->i_streams-1 );
1120                         free( p_stream );
1121                         p_ogg->i_streams--;
1122                     }
1123                 }
1124                 else if( (*oggpacket.packet & PACKET_TYPE_BITS ) == PACKET_TYPE_HEADER &&
1125                          oggpacket.bytes >= 56+1 )
1126                 {
1127                     stream_header_t tmp;
1128                     stream_header_t *st = &tmp;
1129
1130                     memcpy( st->streamtype, &oggpacket.packet[1+0], 8 );
1131                     memcpy( st->subtype, &oggpacket.packet[1+8], 4 );
1132                     st->size = GetDWLE( &oggpacket.packet[1+12] );
1133                     st->time_unit = GetQWLE( &oggpacket.packet[1+16] );
1134                     st->samples_per_unit = GetQWLE( &oggpacket.packet[1+24] );
1135                     st->default_len = GetDWLE( &oggpacket.packet[1+32] );
1136                     st->buffersize = GetDWLE( &oggpacket.packet[1+36] );
1137                     st->bits_per_sample = GetWLE( &oggpacket.packet[1+40] ); // (padding 2)
1138
1139                     /* Check for video header (new format) */
1140                     if( !strncmp( st->streamtype, "video", 5 ) )
1141                     {
1142                         st->sh.video.width = GetDWLE( &oggpacket.packet[1+44] );
1143                         st->sh.video.height = GetDWLE( &oggpacket.packet[1+48] );
1144
1145                         p_stream->fmt.i_cat = VIDEO_ES;
1146
1147                         /* We need to get rid of the header packet */
1148                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1149
1150                         p_stream->fmt.i_codec =
1151                             VLC_FOURCC( st->subtype[0], st->subtype[1],
1152                                         st->subtype[2], st->subtype[3] );
1153                         msg_Dbg( p_demux, "found video header of type: %.4s",
1154                                  (char *)&p_stream->fmt.i_codec );
1155
1156                         p_stream->fmt.video.i_frame_rate = 10000000;
1157                         p_stream->fmt.video.i_frame_rate_base = st->time_unit;
1158                         if( st->time_unit <= 0 )
1159                             st->time_unit = 400000;
1160                         p_stream->f_rate = 10000000.0 / st->time_unit;
1161                         p_stream->fmt.video.i_bits_per_pixel = st->bits_per_sample;
1162                         p_stream->fmt.video.i_width = st->sh.video.width;
1163                         p_stream->fmt.video.i_height = st->sh.video.height;
1164
1165                         msg_Dbg( p_demux,
1166                                  "fps: %f, width:%i; height:%i, bitcount:%i",
1167                                  p_stream->f_rate,
1168                                  p_stream->fmt.video.i_width,
1169                                  p_stream->fmt.video.i_height,
1170                                  p_stream->fmt.video.i_bits_per_pixel );
1171                     }
1172                     /* Check for audio header (new format) */
1173                     else if( !strncmp( st->streamtype, "audio", 5 ) )
1174                     {
1175                         char p_buffer[5];
1176                         unsigned int i_extra_size;
1177                         int i_format_tag;
1178
1179                         st->sh.audio.channels = GetWLE( &oggpacket.packet[1+44] );
1180                         st->sh.audio.blockalign = GetWLE( &oggpacket.packet[1+48] );
1181                         st->sh.audio.avgbytespersec = GetDWLE( &oggpacket.packet[1+52] );
1182
1183                         p_stream->fmt.i_cat = AUDIO_ES;
1184
1185                         /* We need to get rid of the header packet */
1186                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1187
1188                         i_extra_size = st->size - 56;
1189
1190                         if( i_extra_size > 0 &&
1191                             i_extra_size < oggpacket.bytes - 1 - 56 )
1192                         {
1193                             p_stream->fmt.i_extra = i_extra_size;
1194                             p_stream->fmt.p_extra = malloc( p_stream->fmt.i_extra );
1195                             if( p_stream->fmt.p_extra )
1196                                 memcpy( p_stream->fmt.p_extra, st + 1,
1197                                         p_stream->fmt.i_extra );
1198                             else
1199                                 p_stream->fmt.i_extra = 0;
1200                         }
1201
1202                         memcpy( p_buffer, st->subtype, 4 );
1203                         p_buffer[4] = '\0';
1204                         i_format_tag = strtol(p_buffer,NULL,16);
1205                         p_stream->fmt.audio.i_channels = st->sh.audio.channels;
1206                         if( st->time_unit <= 0 )
1207                             st->time_unit = 10000000;
1208                         p_stream->f_rate = p_stream->fmt.audio.i_rate = st->samples_per_unit * 10000000 / st->time_unit;
1209                         p_stream->fmt.i_bitrate = st->sh.audio.avgbytespersec * 8;
1210                         p_stream->fmt.audio.i_blockalign = st->sh.audio.blockalign;
1211                         p_stream->fmt.audio.i_bitspersample = st->bits_per_sample;
1212
1213                         wf_tag_to_fourcc( i_format_tag,
1214                                           &p_stream->fmt.i_codec, 0 );
1215
1216                         if( p_stream->fmt.i_codec ==
1217                             VLC_FOURCC('u','n','d','f') )
1218                         {
1219                             p_stream->fmt.i_codec = VLC_FOURCC( 'm', 's',
1220                                 ( i_format_tag >> 8 ) & 0xff,
1221                                 i_format_tag & 0xff );
1222                         }
1223
1224                         msg_Dbg( p_demux, "found audio header of type: %.4s",
1225                                  (char *)&p_stream->fmt.i_codec );
1226                         msg_Dbg( p_demux, "audio:0x%4.4x channels:%d %dHz "
1227                                  "%dbits/sample %dkb/s",
1228                                  i_format_tag,
1229                                  p_stream->fmt.audio.i_channels,
1230                                  p_stream->fmt.audio.i_rate,
1231                                  p_stream->fmt.audio.i_bitspersample,
1232                                  p_stream->fmt.i_bitrate / 1024 );
1233                     }
1234                     /* Check for text (subtitles) header */
1235                     else if( !strncmp(st->streamtype, "text", 4) )
1236                     {
1237                         /* We need to get rid of the header packet */
1238                         ogg_stream_packetout( &p_stream->os, &oggpacket );
1239
1240                         msg_Dbg( p_demux, "found text subtitles header" );
1241                         p_stream->fmt.i_cat = SPU_ES;
1242                         p_stream->fmt.i_codec = VLC_FOURCC('s','u','b','t');
1243                         p_stream->f_rate = 1000; /* granulepos is in millisec */
1244                     }
1245                     else
1246                     {
1247                         msg_Dbg( p_demux, "stream %d has a header marker "
1248                             "but is of an unknown type", p_ogg->i_streams-1 );
1249                         free( p_stream );
1250                         p_ogg->i_streams--;
1251                     }
1252                 }
1253                 else if( oggpacket.bytes >= 7 &&
1254                              ! memcmp( oggpacket.packet, "fishead", 7 ) )
1255
1256                 {
1257                     /* Skeleton */
1258                     msg_Dbg( p_demux, "stream %d is a skeleton",
1259                                 p_ogg->i_streams-1 );
1260                     /* FIXME: https://trac.videolan.org/vlc/ticket/1412 */
1261                 }
1262                 else
1263                 {
1264                     msg_Dbg( p_demux, "stream %d is of unknown type",
1265                              p_ogg->i_streams-1 );
1266                     free( p_stream );
1267                     p_ogg->i_streams--;
1268                 }
1269
1270                 if( Ogg_ReadPage( p_demux, &oggpage ) != VLC_SUCCESS )
1271                     return VLC_EGENERIC;
1272             }
1273
1274             /* we'll need to get all headers for all of those streams
1275                that we have to backup headers for */
1276             p_ogg->i_bos = 0;
1277             for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
1278             {
1279                 if( p_ogg->pp_stream[i_stream]->b_force_backup )
1280                     p_ogg->i_bos++;
1281             }
1282
1283
1284             /* This is the first data page, which means we are now finished
1285              * with the initial pages. We just need to store it in the relevant
1286              * bitstream. */
1287             for( i_stream = 0; i_stream < p_ogg->i_streams; i_stream++ )
1288             {
1289                 if( ogg_stream_pagein( &p_ogg->pp_stream[i_stream]->os,
1290                                        &oggpage ) == 0 )
1291                 {
1292                     p_ogg->b_page_waiting = true;
1293                     break;
1294                 }
1295             }
1296
1297             return VLC_SUCCESS;
1298         }
1299     }
1300
1301     return VLC_EGENERIC;
1302 }
1303
1304 /****************************************************************************
1305  * Ogg_BeginningOfStream: Look for Beginning of Stream ogg pages and add
1306  *                        Elementary streams.
1307  ****************************************************************************/
1308 static int Ogg_BeginningOfStream( demux_t *p_demux )
1309 {
1310     demux_sys_t *p_ogg = p_demux->p_sys  ;
1311     logical_stream_t *p_old_stream = p_ogg->p_old_stream;
1312     int i_stream;
1313
1314     /* Find the logical streams embedded in the physical stream and
1315      * initialize our p_ogg structure. */
1316     if( Ogg_FindLogicalStreams( p_demux ) != VLC_SUCCESS )
1317     {
1318         msg_Warn( p_demux, "couldn't find any ogg logical stream" );
1319         return VLC_EGENERIC;
1320     }
1321
1322     p_ogg->i_bitrate = 0;
1323
1324     for( i_stream = 0 ; i_stream < p_ogg->i_streams; i_stream++ )
1325     {
1326         logical_stream_t *p_stream = p_ogg->pp_stream[i_stream];
1327
1328         p_stream->p_es = NULL;
1329
1330         /* Try first to reuse an old ES */
1331         if( p_old_stream &&
1332             p_old_stream->fmt.i_cat == p_stream->fmt.i_cat &&
1333             p_old_stream->fmt.i_codec == p_stream->fmt.i_codec )
1334         {
1335             msg_Dbg( p_demux, "will reuse old stream to avoid glitch" );
1336
1337             p_stream->p_es = p_old_stream->p_es;
1338             es_format_Copy( &p_stream->fmt_old, &p_old_stream->fmt );
1339
1340             p_old_stream->p_es = NULL;
1341             p_old_stream = NULL;
1342         }
1343
1344         if( !p_stream->p_es )
1345             p_stream->p_es = es_out_Add( p_demux->out, &p_stream->fmt );
1346
1347         // TODO: something to do here ?
1348         if( p_stream->fmt.i_codec == VLC_FOURCC('c','m','m','l') )
1349         {
1350             /* Set the CMML stream active */
1351             es_out_Control( p_demux->out, ES_OUT_SET_ES, p_stream->p_es );
1352         }
1353
1354         p_ogg->i_bitrate += p_stream->fmt.i_bitrate;
1355
1356         p_stream->i_pcr = p_stream->i_previous_pcr =
1357             p_stream->i_interpolated_pcr = -1;
1358         p_stream->b_reinit = false;
1359     }
1360
1361     if( p_ogg->p_old_stream )
1362     {
1363         if( p_ogg->p_old_stream->p_es )
1364             msg_Dbg( p_demux, "old stream not reused" );
1365         Ogg_LogicalStreamDelete( p_demux, p_ogg->p_old_stream );
1366         p_ogg->p_old_stream = NULL;
1367     }
1368     return VLC_SUCCESS;
1369 }
1370
1371 /****************************************************************************
1372  * Ogg_EndOfStream: clean up the ES when an End of Stream is detected.
1373  ****************************************************************************/
1374 static void Ogg_EndOfStream( demux_t *p_demux )
1375 {
1376     demux_sys_t *p_ogg = p_demux->p_sys  ;
1377     int i_stream;
1378
1379     for( i_stream = 0 ; i_stream < p_ogg->i_streams; i_stream++ )
1380         Ogg_LogicalStreamDelete( p_demux, p_ogg->pp_stream[i_stream] );
1381     free( p_ogg->pp_stream );
1382
1383     /* Reinit p_ogg */
1384     p_ogg->i_bitrate = 0;
1385     p_ogg->i_streams = 0;
1386     p_ogg->pp_stream = NULL;
1387 }
1388
1389 /**
1390  * This function delete and release all data associated to a logical_stream_t
1391  */
1392 static void Ogg_LogicalStreamDelete( demux_t *p_demux, logical_stream_t *p_stream )
1393 {
1394     if( p_stream->p_es )
1395         es_out_Del( p_demux->out, p_stream->p_es );
1396
1397     ogg_stream_clear( &p_stream->os );
1398     free( p_stream->p_headers );
1399
1400     es_format_Clean( &p_stream->fmt_old );
1401     es_format_Clean( &p_stream->fmt );
1402
1403     free( p_stream );
1404 }
1405 /**
1406  * This function check if a we need to reset a decoder in case we are
1407  * reusing an old ES
1408  */
1409 static bool Ogg_IsVorbisFormatCompatible( const es_format_t *p_new, const es_format_t *p_old )
1410 {
1411     int i_new = 0;
1412     int i_old = 0;
1413     int i;
1414
1415     for( i = 0; i < 3; i++ )
1416     {
1417         const uint8_t *p_new_extra = ( const uint8_t*)p_new->p_extra + i_new;
1418         const uint8_t *p_old_extra = ( const uint8_t*)p_old->p_extra + i_old;
1419
1420         if( p_new->i_extra < i_new+2 || p_old->i_extra < i_old+2 )
1421             return false;
1422
1423         const int i_new_size = GetWBE( &p_new_extra[0] );
1424         const int i_old_size = GetWBE( &p_old_extra[0] );
1425
1426         if( i != 1 ) /* Ignore vorbis comment */
1427         {
1428             if( i_new_size != i_old_size )
1429                 return false;
1430             if( memcmp( &p_new_extra[2], &p_old_extra[2], i_new_size ) )
1431                 return false;
1432         }
1433
1434         i_new += 2 + i_new_size;
1435         i_old += 2 + i_old_size;
1436     }
1437     return true;
1438 }
1439 static bool Ogg_LogicalStreamResetEsFormat( demux_t *p_demux, logical_stream_t *p_stream )
1440 {
1441     bool b_compatible = false;
1442     if( !p_stream->fmt_old.i_cat || !p_stream->fmt_old.i_codec )
1443         return true;
1444
1445     /* Only vorbis is supported */
1446     if( p_stream->fmt.i_codec == VLC_FOURCC( 'v','o','r','b' ) )
1447         b_compatible = Ogg_IsVorbisFormatCompatible( &p_stream->fmt, &p_stream->fmt_old );
1448
1449     if( !b_compatible )
1450         msg_Warn( p_demux, "cannot reuse old stream, resetting the decoder" );
1451
1452     return !b_compatible;
1453 }
1454
1455 static void Ogg_ReadTheoraHeader( logical_stream_t *p_stream,
1456                                   ogg_packet *p_oggpacket )
1457 {
1458     bs_t bitstream;
1459     int i_fps_numerator;
1460     int i_fps_denominator;
1461     int i_keyframe_frequency_force;
1462
1463     p_stream->fmt.i_cat = VIDEO_ES;
1464     p_stream->fmt.i_codec = VLC_FOURCC( 't','h','e','o' );
1465
1466     /* Signal that we want to keep a backup of the theora
1467      * stream headers. They will be used when switching between
1468      * audio streams. */
1469     p_stream->b_force_backup = 1;
1470
1471     /* Cheat and get additionnal info ;) */
1472     bs_init( &bitstream, p_oggpacket->packet, p_oggpacket->bytes );
1473     bs_skip( &bitstream, 56 );
1474     bs_read( &bitstream, 8 ); /* major version num */
1475     bs_read( &bitstream, 8 ); /* minor version num */
1476     bs_read( &bitstream, 8 ); /* subminor version num */
1477     bs_read( &bitstream, 16 ) /*<< 4*/; /* width */
1478     bs_read( &bitstream, 16 ) /*<< 4*/; /* height */
1479     bs_read( &bitstream, 24 ); /* frame width */
1480     bs_read( &bitstream, 24 ); /* frame height */
1481     bs_read( &bitstream, 8 ); /* x offset */
1482     bs_read( &bitstream, 8 ); /* y offset */
1483
1484     i_fps_numerator = bs_read( &bitstream, 32 );
1485     i_fps_denominator = bs_read( &bitstream, 32 );
1486     bs_read( &bitstream, 24 ); /* aspect_numerator */
1487     bs_read( &bitstream, 24 ); /* aspect_denominator */
1488
1489     p_stream->fmt.video.i_frame_rate = i_fps_numerator;
1490     p_stream->fmt.video.i_frame_rate_base = i_fps_denominator;
1491
1492     bs_read( &bitstream, 8 ); /* colorspace */
1493     p_stream->fmt.i_bitrate = bs_read( &bitstream, 24 );
1494     bs_read( &bitstream, 6 ); /* quality */
1495
1496     i_keyframe_frequency_force = 1 << bs_read( &bitstream, 5 );
1497
1498     /* granule_shift = i_log( frequency_force -1 ) */
1499     p_stream->i_granule_shift = 0;
1500     i_keyframe_frequency_force--;
1501     while( i_keyframe_frequency_force )
1502     {
1503         p_stream->i_granule_shift++;
1504         i_keyframe_frequency_force >>= 1;
1505     }
1506
1507     p_stream->f_rate = ((float)i_fps_numerator) / i_fps_denominator;
1508 }
1509
1510 static void Ogg_ReadVorbisHeader( logical_stream_t *p_stream,
1511                                   ogg_packet *p_oggpacket )
1512 {
1513     oggpack_buffer opb;
1514
1515     p_stream->fmt.i_cat = AUDIO_ES;
1516     p_stream->fmt.i_codec = VLC_FOURCC( 'v','o','r','b' );
1517
1518     /* Signal that we want to keep a backup of the vorbis
1519      * stream headers. They will be used when switching between
1520      * audio streams. */
1521     p_stream->b_force_backup = 1;
1522
1523     /* Cheat and get additionnal info ;) */
1524     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1525     oggpack_adv( &opb, 88 );
1526     p_stream->fmt.audio.i_channels = oggpack_read( &opb, 8 );
1527     p_stream->f_rate = p_stream->fmt.audio.i_rate =
1528         oggpack_read( &opb, 32 );
1529     oggpack_adv( &opb, 32 );
1530     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
1531 }
1532
1533 static void Ogg_ReadSpeexHeader( logical_stream_t *p_stream,
1534                                  ogg_packet *p_oggpacket )
1535 {
1536     oggpack_buffer opb;
1537
1538     p_stream->fmt.i_cat = AUDIO_ES;
1539     p_stream->fmt.i_codec = VLC_FOURCC( 's','p','x',' ' );
1540
1541     /* Signal that we want to keep a backup of the speex
1542      * stream headers. They will be used when switching between
1543      * audio streams. */
1544     p_stream->b_force_backup = 1;
1545
1546     /* Cheat and get additionnal info ;) */
1547     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1548     oggpack_adv( &opb, 224 );
1549     oggpack_adv( &opb, 32 ); /* speex_version_id */
1550     oggpack_adv( &opb, 32 ); /* header_size */
1551     p_stream->f_rate = p_stream->fmt.audio.i_rate = oggpack_read( &opb, 32 );
1552     oggpack_adv( &opb, 32 ); /* mode */
1553     oggpack_adv( &opb, 32 ); /* mode_bitstream_version */
1554     p_stream->fmt.audio.i_channels = oggpack_read( &opb, 32 );
1555     p_stream->fmt.i_bitrate = oggpack_read( &opb, 32 );
1556 }
1557
1558 static void Ogg_ReadFlacHeader( demux_t *p_demux, logical_stream_t *p_stream,
1559                                 ogg_packet *p_oggpacket )
1560 {
1561     /* Parse the STREAMINFO metadata */
1562     bs_t s;
1563
1564     bs_init( &s, p_oggpacket->packet, p_oggpacket->bytes );
1565
1566     bs_read( &s, 1 );
1567     if( bs_read( &s, 7 ) == 0 )
1568     {
1569         if( bs_read( &s, 24 ) >= 34 /*size STREAMINFO*/ )
1570         {
1571             bs_skip( &s, 80 );
1572             p_stream->f_rate = p_stream->fmt.audio.i_rate = bs_read( &s, 20 );
1573             p_stream->fmt.audio.i_channels = bs_read( &s, 3 ) + 1;
1574
1575             msg_Dbg( p_demux, "FLAC header, channels: %i, rate: %i",
1576                      p_stream->fmt.audio.i_channels, (int)p_stream->f_rate );
1577         }
1578         else
1579         {
1580             msg_Dbg( p_demux, "FLAC STREAMINFO metadata too short" );
1581         }
1582
1583         /* Fake this as the last metadata block */
1584         *((uint8_t*)p_oggpacket->packet) |= 0x80;
1585     }
1586     else
1587     {
1588         /* This ain't a STREAMINFO metadata */
1589         msg_Dbg( p_demux, "Invalid FLAC STREAMINFO metadata" );
1590     }
1591 }
1592
1593 static void Ogg_ReadKateHeader( logical_stream_t *p_stream,
1594                                 ogg_packet *p_oggpacket )
1595 {
1596     oggpack_buffer opb;
1597     int32_t gnum;
1598     int32_t gden;
1599     int n;
1600
1601     p_stream->fmt.i_cat = SPU_ES;
1602     p_stream->fmt.i_codec = VLC_FOURCC( 'k','a','t','e' );
1603
1604     /* Signal that we want to keep a backup of the kate
1605      * stream headers. They will be used when switching between
1606      * kate streams. */
1607     p_stream->b_force_backup = 1;
1608
1609     /* Cheat and get additionnal info ;) */
1610     oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1611     oggpack_adv( &opb, 11*8 ); /* packet type, kate magic, version */
1612     p_stream->i_kate_num_headers = oggpack_read( &opb, 8 );
1613     oggpack_adv( &opb, 3*8 );
1614     p_stream->i_granule_shift = oggpack_read( &opb, 8 );
1615     oggpack_adv( &opb, 8*8 ); /* reserved */
1616     gnum = oggpack_read( &opb, 32 );
1617     gden = oggpack_read( &opb, 32 );
1618     p_stream->f_rate = (double)gnum/gden;
1619
1620     p_stream->fmt.psz_language = malloc(16);
1621     if( p_stream->fmt.psz_language )
1622     {
1623         for( n = 0; n < 16; ++n )
1624             p_stream->fmt.psz_language[n] = oggpack_read(&opb,8);
1625         p_stream->fmt.psz_language[15] = 0; /* just in case */
1626     }
1627     else
1628     {
1629         for( n = 0; n < 16; ++n )
1630             oggpack_read(&opb,8);
1631     }
1632     p_stream->fmt.psz_description = malloc(16);
1633     if( p_stream->fmt.psz_description )
1634     {
1635         for( n = 0; n < 16; ++n )
1636             p_stream->fmt.psz_description[n] = oggpack_read(&opb,8);
1637         p_stream->fmt.psz_description[15] = 0; /* just in case */
1638     }
1639     else
1640     {
1641         for( n = 0; n < 16; ++n )
1642             oggpack_read(&opb,8);
1643     }
1644 }
1645
1646 static void Ogg_ReadAnnodexHeader( vlc_object_t *p_this,
1647                                    logical_stream_t *p_stream,
1648                                    ogg_packet *p_oggpacket )
1649 {
1650     if( p_oggpacket->bytes >= 28 &&
1651         !memcmp( p_oggpacket->packet, "Annodex", 7 ) )
1652     {
1653         oggpack_buffer opb;
1654
1655         uint16_t major_version;
1656         uint16_t minor_version;
1657         uint64_t timebase_numerator;
1658         uint64_t timebase_denominator;
1659
1660         Ogg_ReadTheoraHeader( p_stream, p_oggpacket );
1661
1662         oggpack_readinit( &opb, p_oggpacket->packet, p_oggpacket->bytes);
1663         oggpack_adv( &opb, 8*8 ); /* "Annodex\0" header */
1664         major_version = oggpack_read( &opb, 2*8 ); /* major version */
1665         minor_version = oggpack_read( &opb, 2*8 ); /* minor version */
1666         timebase_numerator = GetQWLE( &p_oggpacket->packet[16] );
1667         timebase_denominator = GetQWLE( &p_oggpacket->packet[24] );
1668     }
1669     else if( p_oggpacket->bytes >= 42 &&
1670              !memcmp( p_oggpacket->packet, "AnxData", 7 ) )
1671     {
1672         uint64_t granule_rate_numerator;
1673         uint64_t granule_rate_denominator;
1674         char content_type_string[1024];
1675
1676         /* Read in Annodex header fields */
1677
1678         granule_rate_numerator = GetQWLE( &p_oggpacket->packet[8] );
1679         granule_rate_denominator = GetQWLE( &p_oggpacket->packet[16] );
1680         p_stream->i_secondary_header_packets =
1681             GetDWLE( &p_oggpacket->packet[24] );
1682
1683         /* we are guaranteed that the first header field will be
1684          * the content-type (by the Annodex standard) */
1685         content_type_string[0] = '\0';
1686         if( !strncasecmp( (char*)(&p_oggpacket->packet[28]), "Content-Type: ", 14 ) )
1687         {
1688             uint8_t *p = memchr( &p_oggpacket->packet[42], '\r',
1689                                  p_oggpacket->bytes - 1 );
1690             if( p && p[0] == '\r' && p[1] == '\n' )
1691                 sscanf( (char*)(&p_oggpacket->packet[42]), "%1024s\r\n",
1692                         content_type_string );
1693         }
1694
1695         msg_Dbg( p_this, "AnxData packet info: %"PRId64" / %"PRId64", %d, ``%s''",
1696                  granule_rate_numerator, granule_rate_denominator,
1697                  p_stream->i_secondary_header_packets, content_type_string );
1698
1699         p_stream->f_rate = (float) granule_rate_numerator /
1700             (float) granule_rate_denominator;
1701
1702         /* What type of file do we have?
1703          * strcmp is safe to use here because we've extracted
1704          * content_type_string from the stream manually */
1705         if( !strncmp(content_type_string, "audio/x-wav", 11) )
1706         {
1707             /* n.b. WAVs are unsupported right now */
1708             p_stream->fmt.i_cat = UNKNOWN_ES;
1709         }
1710         else if( !strncmp(content_type_string, "audio/x-vorbis", 14) )
1711         {
1712             p_stream->fmt.i_cat = AUDIO_ES;
1713             p_stream->fmt.i_codec = VLC_FOURCC( 'v','o','r','b' );
1714
1715             p_stream->b_force_backup = 1;
1716         }
1717         else if( !strncmp(content_type_string, "audio/x-speex", 14) )
1718         {
1719             p_stream->fmt.i_cat = AUDIO_ES;
1720             p_stream->fmt.i_codec = VLC_FOURCC( 's','p','x',' ' );
1721
1722             p_stream->b_force_backup = 1;
1723         }
1724         else if( !strncmp(content_type_string, "video/x-theora", 14) )
1725         {
1726             p_stream->fmt.i_cat = VIDEO_ES;
1727             p_stream->fmt.i_codec = VLC_FOURCC( 't','h','e','o' );
1728
1729             p_stream->b_force_backup = 1;
1730         }
1731         else if( !strncmp(content_type_string, "video/x-xvid", 14) )
1732         {
1733             p_stream->fmt.i_cat = VIDEO_ES;
1734             p_stream->fmt.i_codec = VLC_FOURCC( 'x','v','i','d' );
1735
1736             p_stream->b_force_backup = 1;
1737         }
1738         else if( !strncmp(content_type_string, "video/mpeg", 14) )
1739         {
1740             /* n.b. MPEG streams are unsupported right now */
1741             p_stream->fmt.i_cat = VIDEO_ES;
1742             p_stream->fmt.i_codec = VLC_FOURCC( 'm','p','g','v' );
1743         }
1744         else if( !strncmp(content_type_string, "text/x-cmml", 11) )
1745         {
1746             ogg_stream_packetout( &p_stream->os, p_oggpacket );
1747             p_stream->fmt.i_cat = SPU_ES;
1748             p_stream->fmt.i_codec = VLC_FOURCC( 'c','m','m','l' );
1749         }
1750     }
1751 }
1752
1753 static uint32_t dirac_uint( bs_t *p_bs )
1754 {
1755     uint32_t u_count = 0, u_value = 0;
1756     /* FIXME possible infinite loop */
1757     while( !bs_read( p_bs, 1 ) )
1758     {
1759         u_count++;
1760         u_value <<= 1;
1761         u_value |= bs_read( p_bs, 1 );
1762     }
1763
1764     return (1<<u_count) - 1 + u_value;
1765 }
1766
1767 static int dirac_bool( bs_t *p_bs )
1768 {
1769     return bs_read( p_bs, 1 );
1770 }
1771
1772 static void Ogg_ReadDiracHeader( logical_stream_t *p_stream,
1773                                  ogg_packet *p_oggpacket )
1774 {
1775     bs_t bs;
1776
1777     p_stream->fmt.i_cat = VIDEO_ES;
1778     p_stream->fmt.i_codec = VLC_FOURCC( 'd','r','a','c' );
1779     p_stream->i_granule_shift = 32;
1780
1781     /* Backing up stream headers is not required -- seqhdrs are repeated
1782      * thoughout the stream at suitable decoding start points */
1783     p_stream->b_force_backup = 0;
1784
1785     /* read in useful bits from sequence header */
1786     bs_init( &bs, p_oggpacket->packet, p_oggpacket->bytes );
1787     bs_skip( &bs, 13*8); /* parse_info_header */
1788     dirac_uint( &bs ); /* major_version */
1789     dirac_uint( &bs ); /* minor_version */
1790     dirac_uint( &bs ); /* profile */
1791     dirac_uint( &bs ); /* level */
1792
1793     uint32_t u_video_format = dirac_uint( &bs ); /* index */
1794
1795     if( dirac_bool( &bs ) )
1796     {
1797         dirac_uint( &bs ); /* frame_width */
1798         dirac_uint( &bs ); /* frame_height */
1799     }
1800
1801     if( dirac_bool( &bs ) )
1802     {
1803         dirac_uint( &bs ); /* chroma_format */
1804     }
1805
1806     if( dirac_bool( &bs ) )
1807     {
1808         dirac_uint( &bs ); /* scan_format */
1809     }
1810
1811     static const struct {
1812         uint32_t u_n /* numerator */, u_d /* denominator */;
1813     } dirac_frate_tbl[] = { /* table 10.3 */
1814         {1,1}, /* this first value is never used */
1815         {24000,1001}, {24,1}, {25,1}, {30000,1001}, {30,1},
1816         {50,1}, {60000,1001}, {60,1}, {15000,1001}, {25,2},
1817     };
1818
1819     static const uint32_t dirac_vidfmt_frate[] = { /* table C.1 */
1820         1, 9, 10, 9, 10, 9, 10, 4, 3, 7, 6, 4, 3, 7, 6, 2, 2, 7, 6, 7, 6,
1821     };
1822
1823     /* FIXME possible out of bound access */
1824     uint32_t u_n = dirac_frate_tbl[dirac_vidfmt_frate[u_video_format]].u_n;
1825     uint32_t u_d = dirac_frate_tbl[dirac_vidfmt_frate[u_video_format]].u_d;
1826     if( dirac_bool( &bs ) )
1827     {
1828         /* FIXME possible out of bound access */
1829         uint32_t frame_rate_index = dirac_uint( &bs );
1830         u_n = dirac_frate_tbl[frame_rate_index].u_n;
1831         u_d = dirac_frate_tbl[frame_rate_index].u_d;
1832         if( frame_rate_index == 0 )
1833         {
1834             u_n = dirac_uint( &bs ); /* frame_rate_numerator */
1835             u_d = dirac_uint( &bs ); /* frame_rate_denominator */
1836         }
1837     }
1838     p_stream->f_rate = (float) u_n / u_d;
1839 }