2 * demuxer for PVA files, such as the ones produced by software to manage
3 * DVB boards like the Hauppauge WinTV DVBs
4 * copyright (c) 2002 Matteo Giani
6 * Uses info from the PVA file specifications found at
7 * http://www.technotrend.de/download/av_format_v1.pdf
9 * This file is part of MPlayer.
11 * MPlayer is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * MPlayer is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License along
22 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 /* WARNING: Quite a hack was required in order to get files by MultiDec
27 * played back correctly. If it breaks anything else, just comment out
28 * the #define below and it will not be compiled in. */
29 #define DEMUX_PVA_MULTIDEC_HACK
30 #define PVA_NEW_PREBYTES_CODE
40 #include "stream/stream.h"
45 * #defines below taken from PVA spec (see URL above)
48 #define PVA_MAX_VIDEO_PACK_LEN 6*1024
50 #define VIDEOSTREAM 0x01
51 #define MAINAUDIOSTREAM 0x02
57 uint8_t is_packet_start
;
65 #ifdef PVA_NEW_PREBYTES_CODE
66 float video_pts_after_prebytes
;
67 long video_size_after_prebytes
;
68 uint8_t prebytes_delivered
;
71 uint8_t synced_stream_id
;
76 int pva_sync(demuxer_t
* demuxer
)
78 uint8_t buffer
[5]={0,0,0,0,0};
80 pva_priv_t
* priv
= (pva_priv_t
*) demuxer
->priv
;
83 /* This function is used to find the next nearest PVA packet start after a seek, since a PVA file
85 * The just_synced field is in the priv structure so that pva_get_payload knows pva_sync
86 * has already read (part of) the PVA header. This way we can avoid to seek back and (hopefully)
87 * be able to read from pipes and such.
91 for(count
=0 ; count
<PVA_MAX_VIDEO_PACK_LEN
&& !demuxer
->stream
->eof
&& !priv
->just_synced
; count
++)
97 buffer
[4]=stream_read_char(demuxer
->stream
);
99 * Check for a PVA packet beginning sequence: we check both the "AV" word at the
100 * very beginning and the "0x55" reserved byte (which is unused and set to 0x55 by spec)
102 if(buffer
[0]=='A' && buffer
[1] == 'V' && buffer
[4] == 0x55) priv
->just_synced
=1;
103 //printf("demux_pva: pva_sync(): current offset= %ld\n",stream_tell(demuxer->stream));
105 if(priv
->just_synced
)
107 priv
->synced_stream_id
=buffer
[2];
116 static int pva_check_file(demuxer_t
* demuxer
)
118 uint8_t buffer
[5]={0,0,0,0,0};
119 mp_msg(MSGT_DEMUX
, MSGL_V
, "Checking for PVA\n");
120 stream_read(demuxer
->stream
,buffer
,5);
121 if(buffer
[0]=='A' && buffer
[1] == 'V' && buffer
[4] == 0x55)
123 mp_msg(MSGT_DEMUX
,MSGL_DBG2
, "Success: PVA\n");
124 return DEMUXER_TYPE_PVA
;
128 mp_msg(MSGT_DEMUX
,MSGL_DBG2
, "Failed: PVA\n");
133 static demuxer_t
* demux_open_pva (demuxer_t
* demuxer
)
135 sh_video_t
*sh_video
= new_sh_video(demuxer
,0);
136 sh_audio_t
*sh_audio
= new_sh_audio(demuxer
,0);
141 stream_reset(demuxer
->stream
);
142 stream_seek(demuxer
->stream
,0);
146 priv
=malloc(sizeof(pva_priv_t
));
148 if(demuxer
->stream
->type
!=STREAMTYPE_FILE
) demuxer
->seekable
=0;
149 else demuxer
->seekable
=1;
152 memset(demuxer
->priv
,0,sizeof(pva_priv_t
));
154 if(!pva_sync(demuxer
))
156 mp_msg(MSGT_DEMUX
,MSGL_ERR
,"Not a PVA file.\n");
160 //printf("priv->just_synced %s after initial sync!\n",priv->just_synced?"set":"UNSET");
162 demuxer
->video
->sh
=sh_video
;
164 //printf("demuxer->stream->end_pos= %d\n",demuxer->stream->end_pos);
167 mp_msg(MSGT_DEMUXER
,MSGL_INFO
,"Opened PVA demuxer...\n");
170 * Audio and Video codecs:
171 * the PVA spec only allows MPEG2 video and MPEG layer II audio. No need to check the formats then.
172 * Moreover, there would be no way to do that since the PVA stream format has no fields to describe
176 sh_video
->format
=0x10000002;
177 sh_video
->ds
=demuxer
->video
;
180 printf("demuxer->video->id==%d\n",demuxer->video->id);
181 printf("demuxer->audio->id==%d\n",demuxer->audio->id);
184 demuxer
->audio
->id
= 0;
185 demuxer
->audio
->sh
=sh_audio
;
186 sh_audio
->format
=0x50;
187 sh_audio
->ds
=demuxer
->audio
;
189 demuxer
->movi_start
=0;
190 demuxer
->movi_end
=demuxer
->stream
->end_pos
;
192 priv
->last_video_pts
=-1;
193 priv
->last_audio_pts
=-1;
198 int pva_get_payload(demuxer_t
* d
,pva_payload_t
* payload
);
200 // 0 = EOF or no stream found
201 // 1 = successfully read a packet
202 static int demux_pva_fill_buffer (demuxer_t
* demux
, demux_stream_t
*ds
)
206 pva_priv_t
* priv
=demux
->priv
;
207 pva_payload_t current_payload
;
211 if(!pva_get_payload(demux
,¤t_payload
)) return 0;
212 switch(current_payload
.type
)
215 if(demux
->video
->id
==-1) demux
->video
->id
=0;
216 if(!current_payload
.is_packet_start
&& priv
->last_video_pts
==-1)
218 /* We should only be here at the beginning of a stream, when we have
219 * not yet encountered a valid Video PTS, or after a seek.
220 * So, skip these starting packets in order not to deliver the
221 * player a bogus PTS.
228 * In every other condition, we are delivering the payload. Set this
229 * so that the following code knows whether to skip it or read it.
233 if(demux
->video
->id
!=0) done
=0;
234 if(current_payload
.is_packet_start
)
236 priv
->last_video_pts
=current_payload
.pts
;
237 //mp_msg(MSGT_DEMUXER,MSGL_DBG2,"demux_pva: Video PTS=%llu , delivered %f\n",current_payload.pts,priv->last_video_pts);
241 dp
=new_demux_packet(current_payload
.size
);
242 dp
->pts
=priv
->last_video_pts
;
243 stream_read(demux
->stream
,dp
->buffer
,current_payload
.size
);
244 ds_add_packet(demux
->video
,dp
);
248 //printf("Skipping %u video bytes\n",current_payload.size);
249 stream_skip(demux
->stream
,current_payload
.size
);
252 case MAINAUDIOSTREAM
:
253 if(demux
->audio
->id
==-1) demux
->audio
->id
=0;
254 if(!current_payload
.is_packet_start
&& priv
->last_audio_pts
==-1)
256 /* Same as above for invalid video PTS, just for audio. */
263 if(current_payload
.is_packet_start
)
265 priv
->last_audio_pts
=current_payload
.pts
;
267 if(demux
->audio
->id
!=0) done
=0;
270 dp
=new_demux_packet(current_payload
.size
);
271 dp
->pts
=priv
->last_audio_pts
;
272 if(current_payload
.offset
!= stream_tell(demux
->stream
))
273 stream_seek(demux
->stream
,current_payload
.offset
);
274 stream_read(demux
->stream
,dp
->buffer
,current_payload
.size
);
275 ds_add_packet(demux
->audio
,dp
);
279 stream_skip(demux
->stream
,current_payload
.size
);
287 int pva_get_payload(demuxer_t
* d
,pva_payload_t
* payload
)
289 uint8_t flags
,pes_head_len
;
291 off_t next_offset
,pva_payload_start
;
292 unsigned char buffer
[256];
293 #ifndef PVA_NEW_PREBYTES_CODE
294 demux_packet_t
* dp
; //hack to deliver the preBytes (see PVA doc)
301 mp_msg(MSGT_DEMUX
,MSGL_ERR
,"demux_pva: pva_get_payload got passed a NULL pointer!\n");
305 priv
= (pva_priv_t
*)d
->priv
;
306 d
->filepos
=stream_tell(d
->stream
);
313 mp_msg(MSGT_DEMUX
,MSGL_V
,"demux_pva: pva_get_payload() detected stream->eof!!!\n");
317 //printf("priv->just_synced %s\n",priv->just_synced?"SET":"UNSET");
319 #ifdef PVA_NEW_PREBYTES_CODE
320 if(priv
->prebytes_delivered
)
321 /* The previous call to this fn has delivered the preBytes. Then we are already inside
322 * the payload. Let's just deliver the video along with its right PTS, the one we stored
323 * in the priv structure and was in the PVA header before the PreBytes.
326 //printf("prebytes_delivered=1. Resetting.\n");
327 payload
->size
= priv
->video_size_after_prebytes
;
328 payload
->pts
= priv
->video_pts_after_prebytes
;
329 payload
->is_packet_start
= 1;
330 payload
->offset
= stream_tell(d
->stream
);
331 payload
->type
= VIDEOSTREAM
;
332 priv
->prebytes_delivered
= 0;
336 if(!priv
->just_synced
)
338 if(stream_read_word(d
->stream
) != (('A'<<8)|'V'))
340 mp_msg(MSGT_DEMUX
,MSGL_V
,"demux_pva: pva_get_payload() missed a SyncWord at %"PRId64
"!! Trying to sync...\n",(int64_t)stream_tell(d
->stream
));
345 mp_msg(MSGT_DEMUX
,MSGL_ERR
,"demux_pva: couldn't sync! (broken file?)");
351 if(priv
->just_synced
)
353 payload
->type
=priv
->synced_stream_id
;
358 payload
->type
=stream_read_char(d
->stream
);
359 stream_skip(d
->stream
,2); //counter and reserved
361 flags
=stream_read_char(d
->stream
);
362 payload
->is_packet_start
=flags
& 0x10;
363 pack_size
=le2me_16(stream_read_word(d
->stream
));
364 mp_msg(MSGT_DEMUX
,MSGL_DBG2
,"demux_pva::pva_get_payload(): pack_size=%u field read at offset %"PRIu64
"\n",pack_size
,(int64_t)stream_tell(d
->stream
)-2);
365 pva_payload_start
=stream_tell(d
->stream
);
366 next_offset
=pva_payload_start
+pack_size
;
370 * The code in the #ifdef directive below is a hack needed to get badly formatted PVA files
371 * such as the ones written by MultiDec played back correctly.
372 * Basically, it works like this: if the PVA packet does not signal a PES header, but the
373 * payload looks like one, let's assume it IS one. It has worked for me up to now.
374 * It can be disabled since it's quite an ugly hack and could potentially break things up
375 * if the PVA audio payload happens to start with 0x000001 even without being a non signalled
377 * Though it's quite unlikely, it potentially could (AFAIK).
379 #ifdef DEMUX_PVA_MULTIDEC_HACK
380 if(payload
->type
==MAINAUDIOSTREAM
)
382 stream_read(d
->stream
,buffer
,3);
383 if(buffer
[0]==0x00 && buffer
[1]==0x00 && buffer
[2]==0x01 && !payload
->is_packet_start
)
385 mp_msg(MSGT_DEMUX
,MSGL_V
,"demux_pva: suspecting non signaled audio PES packet start. Maybe file by MultiDec?\n");
386 payload
->is_packet_start
=1;
388 stream_seek(d
->stream
,stream_tell(d
->stream
)-3);
393 if(!payload
->is_packet_start
)
395 payload
->offset
=stream_tell(d
->stream
);
396 payload
->size
=pack_size
;
399 { //here comes the good part...
400 switch(payload
->type
)
403 payload
->pts
=(float)(le2me_32(stream_read_dword(d
->stream
)))/90000;
404 //printf("Video PTS: %f\n",payload->pts);
406 #ifdef PVA_NEW_PREBYTES_CODE
407 && !priv
->prebytes_delivered
411 #ifndef PVA_NEW_PREBYTES_CODE
412 dp
=new_demux_packet(flags
&0x03);
413 stream_read(d
->stream
,dp
->buffer
,flags
& 0x03); //read PreBytes
414 ds_add_packet(d
->video
,dp
);
416 //printf("Delivering prebytes. Setting prebytes_delivered.");
417 payload
->offset
=stream_tell(d
->stream
);
418 payload
->size
= flags
& 0x03;
419 priv
->video_pts_after_prebytes
= payload
->pts
;
420 priv
->video_size_after_prebytes
= pack_size
- 4 - (flags
& 0x03);
421 payload
->pts
=priv
->last_video_pts
;
422 payload
->is_packet_start
=0;
423 priv
->prebytes_delivered
=1;
429 //now we are at real beginning of payload.
430 payload
->offset
=stream_tell(d
->stream
);
431 //size is pack_size minus PTS size minus PreBytes size.
432 payload
->size
=pack_size
- 4 - (flags
& 0x03);
434 case MAINAUDIOSTREAM
:
435 stream_skip(d
->stream
,3); //FIXME properly parse PES header.
436 //printf("StreamID in audio PES header: 0x%2X\n",stream_read_char(d->stream));
437 stream_skip(d
->stream
,4);
439 buffer
[255]=stream_read_char(d
->stream
);
440 pes_head_len
=stream_read_char(d
->stream
);
441 stream_read(d
->stream
,buffer
,pes_head_len
);
442 if(!(buffer
[255]&0x80)) //PES header does not contain PTS.
444 mp_msg(MSGT_DEMUX
,MSGL_V
,"Audio PES packet does not contain PTS. (pes_head_len=%d)\n",pes_head_len
);
445 payload
->pts
=priv
->last_audio_pts
;
448 else //PES header DOES contain PTS
450 if((buffer
[0] & 0xf0)!=0x20) // PTS badly formatted
452 mp_msg(MSGT_DEMUX
,MSGL_V
,"demux_pva: expected audio PTS but badly formatted... (read 0x%02X). Falling back to previous PTS (hack).\n",buffer
[0]);
453 payload
->pts
=priv
->last_audio_pts
;
461 temp_pts
|=((uint64_t)(buffer
[0] & 0x0e) << 29);
462 temp_pts
|=buffer
[1]<<22;
463 temp_pts
|=(buffer
[2] & 0xfe) << 14;
464 temp_pts
|=buffer
[3]<<7;
465 temp_pts
|=(buffer
[4] & 0xfe) >> 1;
467 * PTS parsing is hopefully finished.
469 payload
->pts
=(float)le2me_64(temp_pts
)/90000;
472 payload
->offset
=stream_tell(d
->stream
);
473 payload
->size
=pack_size
-stream_tell(d
->stream
)+pva_payload_start
;
480 static void demux_seek_pva(demuxer_t
* demuxer
,float rel_seek_secs
,float audio_delay
,int flags
)
484 pva_priv_t
* priv
=demuxer
->priv
;
486 total_bitrate
=((sh_audio_t
*)demuxer
->audio
->sh
)->i_bps
+ ((sh_video_t
*)demuxer
->video
->sh
)->i_bps
;
489 * Compute absolute offset inside the stream. Approximate total bitrate with sum of bitrates
490 * reported by the audio and video codecs. The seek is not accurate because, just like
491 * with MPEG streams, the bitrate is not constant. Moreover, we do not take into account
492 * the overhead caused by PVA and PES headers.
493 * If the calculated absolute offset is negative, seek to the beginning of the file.
496 dest_offset
=stream_tell(demuxer
->stream
)+rel_seek_secs
*total_bitrate
;
497 if(dest_offset
<0) dest_offset
=0;
499 stream_seek(demuxer
->stream
,dest_offset
);
501 if(!pva_sync(demuxer
))
503 mp_msg(MSGT_DEMUX
,MSGL_V
,"demux_pva: Couldn't seek!\n");
508 * Reset the PTS info inside the pva_priv_t structure. This way we don't deliver
509 * data with the wrong PTSs (the ones we had before seeking).
513 priv
->last_video_pts
=-1;
514 priv
->last_audio_pts
=-1;
519 static void demux_close_pva(demuxer_t
* demuxer
)
529 const demuxer_desc_t demuxer_desc_pva
= {
534 "streams from DVB cards",
536 0, // unsafe autodetect
538 demux_pva_fill_buffer
,