1 /*****************************************************************************
2 * lpcm.c: lpcm decoder/packetizer module
3 *****************************************************************************
4 * Copyright (C) 1999-2008 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
8 * Henri Fallon <henri@videolan.org>
9 * Christophe Massiot <massiot@via.ecp.fr>
10 * Gildas Bazin <gbazin@videolan.org>
11 * Lauren Aimar <fenrir _AT_ videolan _DOT_ org >
12 * Steinar H. Gunderson <steinar+vlc@gunderson.no>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
27 *****************************************************************************/
29 /*****************************************************************************
31 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_plugin.h>
38 #include <vlc_codec.h>
42 /*****************************************************************************
44 *****************************************************************************/
45 static int OpenDecoder ( vlc_object_t
* );
46 static int OpenPacketizer( vlc_object_t
* );
47 static void CloseCommon ( vlc_object_t
* );
50 static int OpenEncoder ( vlc_object_t
* );
51 static void CloseEncoder ( vlc_object_t
* );
52 static block_t
*EncodeFrames( encoder_t
*, aout_buffer_t
* );
57 set_category( CAT_INPUT
)
58 set_subcategory( SUBCAT_INPUT_ACODEC
)
59 set_description( N_("Linear PCM audio decoder") )
60 set_capability( "decoder", 100 )
61 set_callbacks( OpenDecoder
, CloseCommon
)
64 set_description( N_("Linear PCM audio packetizer") )
65 set_capability( "packetizer", 100 )
66 set_callbacks( OpenPacketizer
, CloseCommon
)
70 set_description( N_("Linear PCM audio encoder") )
71 set_capability( "encoder", 100 )
72 set_callbacks( OpenEncoder
, CloseEncoder
)
73 add_shortcut( "lpcm" )
79 /*****************************************************************************
80 * decoder_sys_t : lpcm decoder descriptor
81 *****************************************************************************/
93 unsigned i_header_size
;
112 * - number of frames in this packet (8 bits)
113 * - first access unit (16 bits) == 0x0003 ?
117 * - current frame (5 bits)
118 * - quantisation (2 bits) 0 == 16bps, 1 == 20bps, 2 == 24bps, 3 == illegal
119 * - frequency (2 bits) 0 == 48 kHz, 1 == 96 kHz, 2 == 44.1 kHz, 3 == 32 kHz
121 * - number of channels - 1 (3 bits) 1 == 2 channels
122 * - dynamic range (8 bits) 0x80 == neutral
124 * LPCM DVD-A header (http://dvd-audio.sourceforge.net/spec/aob.shtml)
125 * - continuity counter (8 bits, clipped to 0x00-0x1f)
126 * - header size (16 bits)
127 * - byte pointer to start of first audio frame.
128 * - unknown (8bits, 0x10 for stereo, 0x00 for surround)
129 * - sample size (4+4 bits)
130 * - samplerate (4+4 bits)
132 * - group assignment (8 bits)
134 * - padding(variable)
138 * - number of channels (4 bits)
139 * - frequency (4 bits)
140 * - bits per sample (2 bits)
144 #define LPCM_VOB_HEADER_LEN (6)
145 #define LPCM_AOB_HEADER_LEN (11)
146 #define LPCM_BD_HEADER_LEN (4)
159 unsigned pi_position
[6];
162 /*****************************************************************************
164 *****************************************************************************/
165 static void *DecodeFrame ( decoder_t
*, block_t
** );
168 static int VobHeader( unsigned *pi_rate
,
169 unsigned *pi_channels
, unsigned *pi_original_channels
,
171 const uint8_t *p_header
);
172 static void VobExtract( aout_buffer_t
*, block_t
*, unsigned i_bits
);
174 static int AobHeader( unsigned *pi_rate
,
175 unsigned *pi_channels
, unsigned *pi_layout
,
177 unsigned *pi_padding
,
179 const uint8_t *p_header
);
180 static void AobExtract( aout_buffer_t
*, block_t
*, unsigned i_bits
, aob_group_t p_group
[2] );
182 static int BdHeader( unsigned *pi_rate
,
183 unsigned *pi_channels
, unsigned *pi_original_channels
,
185 const uint8_t *p_header
);
186 static void BdExtract( aout_buffer_t
*, block_t
* );
189 /*****************************************************************************
191 *****************************************************************************/
192 static int OpenCommon( vlc_object_t
*p_this
, bool b_packetizer
)
194 decoder_t
*p_dec
= (decoder_t
*)p_this
;
195 decoder_sys_t
*p_sys
;
199 switch( p_dec
->fmt_in
.i_codec
)
202 case VLC_CODEC_DVD_LPCM
:
204 i_header_size
= LPCM_VOB_HEADER_LEN
;
207 case VLC_CODEC_DVDA_LPCM
:
209 i_header_size
= LPCM_AOB_HEADER_LEN
;
212 case VLC_CODEC_BD_LPCM
:
214 i_header_size
= LPCM_BD_HEADER_LEN
;
220 /* Allocate the memory needed to store the decoder's structure */
221 if( ( p_dec
->p_sys
= p_sys
= malloc(sizeof(decoder_sys_t
)) ) == NULL
)
225 p_sys
->b_packetizer
= b_packetizer
;
226 date_Set( &p_sys
->end_date
, 0 );
227 p_sys
->i_type
= i_type
;
228 p_sys
->i_header_size
= i_header_size
;
230 /* Set output properties */
231 p_dec
->fmt_out
.i_cat
= AUDIO_ES
;
238 p_dec
->fmt_out
.i_codec
= VLC_CODEC_DVD_LPCM
;
241 p_dec
->fmt_out
.i_codec
= VLC_CODEC_DVDA_LPCM
;
246 p_dec
->fmt_out
.i_codec
= VLC_CODEC_BD_LPCM
;
252 switch( p_dec
->fmt_out
.audio
.i_bitspersample
)
256 p_dec
->fmt_out
.i_codec
= VLC_CODEC_S24B
;
257 p_dec
->fmt_out
.audio
.i_bitspersample
= 24;
260 p_dec
->fmt_out
.i_codec
= VLC_CODEC_S16B
;
261 p_dec
->fmt_out
.audio
.i_bitspersample
= 16;
267 p_dec
->pf_decode_audio
= (aout_buffer_t
*(*)(decoder_t
*, block_t
**))
269 p_dec
->pf_packetize
= (block_t
*(*)(decoder_t
*, block_t
**))
274 static int OpenDecoder( vlc_object_t
*p_this
)
276 return OpenCommon( p_this
, false );
278 static int OpenPacketizer( vlc_object_t
*p_this
)
280 return OpenCommon( p_this
, true );
283 /*****************************************************************************
284 * DecodeFrame: decodes an lpcm frame.
285 ****************************************************************************
286 * Beware, this function must be fed with complete frames (PES packet).
287 *****************************************************************************/
288 static void *DecodeFrame( decoder_t
*p_dec
, block_t
**pp_block
)
290 decoder_sys_t
*p_sys
= p_dec
->p_sys
;
292 unsigned int i_rate
= 0, i_original_channels
= 0, i_channels
= 0, i_bits
= 0;
295 if( !pp_block
|| !*pp_block
) return NULL
;
298 *pp_block
= NULL
; /* So the packet doesn't get re-sent */
300 /* Date management */
301 if( p_block
->i_pts
> VLC_TS_INVALID
&&
302 p_block
->i_pts
!= date_Get( &p_sys
->end_date
) )
304 date_Set( &p_sys
->end_date
, p_block
->i_pts
);
307 if( !date_Get( &p_sys
->end_date
) )
309 /* We've just started the stream, wait for the first PTS. */
310 block_Release( p_block
);
314 if( p_block
->i_buffer
<= p_sys
->i_header_size
)
316 msg_Err(p_dec
, "frame is too short");
317 block_Release( p_block
);
322 unsigned i_padding
= 0;
323 aob_group_t p_aob_group
[2];
324 switch( p_sys
->i_type
)
327 i_ret
= VobHeader( &i_rate
, &i_channels
, &i_original_channels
, &i_bits
,
331 i_ret
= AobHeader( &i_rate
, &i_channels
, &i_original_channels
, &i_bits
, &i_padding
,
336 i_ret
= BdHeader( &i_rate
, &i_channels
, &i_original_channels
, &i_bits
,
343 if( i_ret
|| p_block
->i_buffer
<= p_sys
->i_header_size
+ i_padding
)
345 msg_Warn( p_dec
, "no frame sync or too small frame" );
346 block_Release( p_block
);
350 /* Set output properties */
351 if( p_dec
->fmt_out
.audio
.i_rate
!= i_rate
)
353 date_Init( &p_sys
->end_date
, i_rate
, 1 );
354 date_Set( &p_sys
->end_date
, p_block
->i_pts
);
356 p_dec
->fmt_out
.audio
.i_rate
= i_rate
;
357 p_dec
->fmt_out
.audio
.i_channels
= i_channels
;
358 p_dec
->fmt_out
.audio
.i_original_channels
= i_original_channels
;
359 p_dec
->fmt_out
.audio
.i_physical_channels
= i_original_channels
& AOUT_CHAN_PHYSMASK
;
361 i_frame_length
= (p_block
->i_buffer
- p_sys
->i_header_size
- i_padding
) / i_channels
* 8 / i_bits
;
363 if( p_sys
->b_packetizer
)
365 p_block
->i_pts
= p_block
->i_dts
= date_Get( &p_sys
->end_date
);
367 date_Increment( &p_sys
->end_date
, i_frame_length
) -
370 /* Just pass on the incoming frame */
378 p_dec
->fmt_out
.i_codec
= VLC_CODEC_S16B
;
379 p_dec
->fmt_out
.audio
.i_bitspersample
= 16;
383 p_dec
->fmt_out
.i_codec
= VLC_CODEC_S24B
;
384 p_dec
->fmt_out
.audio
.i_bitspersample
= 24;
388 aout_buffer_t
*p_aout_buffer
;
389 p_aout_buffer
= decoder_NewAudioBuffer( p_dec
, i_frame_length
);
393 p_aout_buffer
->i_pts
= date_Get( &p_sys
->end_date
);
394 p_aout_buffer
->i_length
=
395 date_Increment( &p_sys
->end_date
, i_frame_length
)
396 - p_aout_buffer
->i_pts
;
398 p_block
->p_buffer
+= p_sys
->i_header_size
+ i_padding
;
399 p_block
->i_buffer
-= p_sys
->i_header_size
+ i_padding
;
401 switch( p_sys
->i_type
)
404 VobExtract( p_aout_buffer
, p_block
, i_bits
);
407 AobExtract( p_aout_buffer
, p_block
, i_bits
, p_aob_group
);
412 BdExtract( p_aout_buffer
, p_block
);
416 block_Release( p_block
);
417 return p_aout_buffer
;
421 /*****************************************************************************
422 * CloseCommon : lpcm decoder destruction
423 *****************************************************************************/
424 static void CloseCommon( vlc_object_t
*p_this
)
426 decoder_t
*p_dec
= (decoder_t
*)p_this
;
427 free( p_dec
->p_sys
);
431 /*****************************************************************************
432 * OpenEncoder: lpcm encoder construction
433 *****************************************************************************/
434 static int OpenEncoder( vlc_object_t
*p_this
)
436 encoder_t
*p_enc
= (encoder_t
*)p_this
;
437 encoder_sys_t
*p_sys
;
439 /* We only support DVD LPCM yet. */
440 if( p_enc
->fmt_out
.i_codec
!= VLC_CODEC_DVD_LPCM
)
443 if( p_enc
->fmt_in
.audio
.i_rate
!= 48000 &&
444 p_enc
->fmt_in
.audio
.i_rate
!= 96000 &&
445 p_enc
->fmt_in
.audio
.i_rate
!= 44100 &&
446 p_enc
->fmt_in
.audio
.i_rate
!= 32000 )
448 msg_Err( p_enc
, "DVD LPCM supports only sample rates of 48, 96, 44.1 or 32 kHz" );
452 if( p_enc
->fmt_in
.audio
.i_channels
> 8 )
454 msg_Err( p_enc
, "DVD LPCM supports a maximum of eight channels" );
458 /* Allocate the memory needed to store the encoder's structure */
459 if( ( p_enc
->p_sys
= p_sys
=
460 (encoder_sys_t
*)malloc(sizeof(encoder_sys_t
)) ) == NULL
)
463 /* In DVD LCPM, a frame is always 150 PTS ticks. */
464 p_sys
->i_frame_samples
= p_enc
->fmt_in
.audio
.i_rate
* 150 / 90000;
465 p_sys
->p_buffer
= (uint8_t *)malloc(
466 p_sys
->i_frame_samples
*
467 p_enc
->fmt_in
.audio
.i_channels
*
468 p_enc
->fmt_in
.audio
.i_bitspersample
);
469 p_sys
->i_buffer_used
= 0;
470 p_sys
->i_frame_num
= 0;
472 p_sys
->i_channels
= p_enc
->fmt_in
.audio
.i_channels
;
473 p_sys
->i_rate
= p_enc
->fmt_in
.audio
.i_rate
;
475 p_enc
->pf_encode_audio
= EncodeFrames
;
476 p_enc
->fmt_in
.i_codec
= p_enc
->fmt_out
.i_codec
;
478 p_enc
->fmt_in
.audio
.i_bitspersample
= 16;
479 p_enc
->fmt_in
.i_codec
= VLC_CODEC_S16B
;
481 p_enc
->fmt_out
.i_bitrate
=
482 p_enc
->fmt_in
.audio
.i_channels
*
483 p_enc
->fmt_in
.audio
.i_rate
*
484 p_enc
->fmt_in
.audio
.i_bitspersample
*
485 (p_sys
->i_frame_samples
+ LPCM_VOB_HEADER_LEN
) /
486 p_sys
->i_frame_samples
;
491 /*****************************************************************************
492 * CloseEncoder: lpcm encoder destruction
493 *****************************************************************************/
494 static void CloseEncoder ( vlc_object_t
*p_this
)
496 encoder_t
*p_enc
= (encoder_t
*)p_this
;
497 encoder_sys_t
*p_sys
= p_enc
->p_sys
;
499 free( p_sys
->p_buffer
);
503 /*****************************************************************************
504 * EncodeFrames: encode zero or more LCPM audio packets
505 *****************************************************************************/
506 static block_t
*EncodeFrames( encoder_t
*p_enc
, aout_buffer_t
*p_aout_buf
)
508 encoder_sys_t
*p_sys
= p_enc
->p_sys
;
509 block_t
*p_first_block
= NULL
, *p_last_block
= NULL
;
511 if( !p_aout_buf
|| !p_aout_buf
->i_buffer
) return NULL
;
513 const int i_num_frames
= ( p_sys
->i_buffer_used
+ p_aout_buf
->i_nb_samples
) /
514 p_sys
->i_frame_samples
;
515 const int i_leftover_samples
= ( p_sys
->i_buffer_used
+ p_aout_buf
->i_nb_samples
) %
516 p_sys
->i_frame_samples
;
517 const int i_frame_size
= p_sys
->i_frame_samples
* p_sys
->i_channels
* 2 + LPCM_VOB_HEADER_LEN
;
518 const int i_start_offset
= -p_sys
->i_buffer_used
;
520 uint8_t i_freq_code
= 0;
522 switch( p_sys
->i_rate
) {
539 int i_bytes_consumed
= 0;
541 for ( int i
= 0; i
< i_num_frames
; ++i
)
543 block_t
*p_block
= block_New( p_enc
, i_frame_size
);
547 uint8_t *frame
= (uint8_t *)p_block
->p_buffer
;
548 frame
[0] = 1; /* one frame in packet */
550 frame
[2] = 0; /* no first access unit */
551 frame
[3] = (p_sys
->i_frame_num
+ i
) & 0x1f; /* no emphasis, no mute */
552 frame
[4] = (i_freq_code
<< 4) | (p_sys
->i_channels
- 1);
553 frame
[5] = 0x80; /* neutral dynamic range */
555 const int i_consume_samples
= p_sys
->i_frame_samples
- p_sys
->i_buffer_used
;
556 const int i_kept_bytes
= p_sys
->i_buffer_used
* p_sys
->i_channels
* 2;
557 const int i_consume_bytes
= i_consume_samples
* p_sys
->i_channels
* 2;
559 memcpy( frame
+ 6, p_sys
->p_buffer
, i_kept_bytes
);
560 memcpy( frame
+ 6 + i_kept_bytes
, p_aout_buf
->p_buffer
+ i_bytes_consumed
, i_consume_bytes
);
562 p_sys
->i_frame_num
++;
563 p_sys
->i_buffer_used
= 0;
564 i_bytes_consumed
+= i_consume_bytes
;
566 /* We need to find i_length by means of next_pts due to possible roundoff errors. */
567 mtime_t this_pts
= p_aout_buf
->i_pts
+
568 (i
* p_sys
->i_frame_samples
+ i_start_offset
) * CLOCK_FREQ
/ p_sys
->i_rate
;
569 mtime_t next_pts
= p_aout_buf
->i_pts
+
570 ((i
+ 1) * p_sys
->i_frame_samples
+ i_start_offset
) * CLOCK_FREQ
/ p_sys
->i_rate
;
572 p_block
->i_pts
= p_block
->i_dts
= this_pts
;
573 p_block
->i_length
= next_pts
- this_pts
;
576 p_first_block
= p_last_block
= p_block
;
578 p_last_block
= p_last_block
->p_next
= p_block
;
581 memcpy( p_sys
->p_buffer
,
582 p_aout_buf
->p_buffer
+ i_bytes_consumed
,
583 i_leftover_samples
* p_sys
->i_channels
* 2 );
584 p_sys
->i_buffer_used
= i_leftover_samples
;
586 return p_first_block
;
590 /*****************************************************************************
592 *****************************************************************************/
593 static int VobHeader( unsigned *pi_rate
,
594 unsigned *pi_channels
, unsigned *pi_original_channels
,
596 const uint8_t *p_header
)
598 const uint8_t i_header
= p_header
[4];
600 switch( (i_header
>> 4) & 0x3 )
616 *pi_channels
= (i_header
& 0x7) + 1;
617 switch( *pi_channels
- 1 )
620 *pi_original_channels
= AOUT_CHAN_CENTER
;
623 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
;
626 /* This is unsure. */
627 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_LFE
;
630 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
631 | AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
;
634 /* This is unsure. */
635 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
636 | AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
640 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
641 | AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
642 | AOUT_CHAN_CENTER
| AOUT_CHAN_LFE
;
645 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
646 | AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
647 | AOUT_CHAN_CENTER
| AOUT_CHAN_MIDDLELEFT
648 | AOUT_CHAN_MIDDLERIGHT
;
651 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
652 | AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
653 | AOUT_CHAN_CENTER
| AOUT_CHAN_MIDDLELEFT
654 | AOUT_CHAN_MIDDLERIGHT
| AOUT_CHAN_LFE
;
658 switch( (i_header
>> 6) & 0x3 )
672 /* Check frame sync and drop it. */
673 if( p_header
[5] != 0x80 )
678 static const unsigned p_aob_group1
[21][6] = {
679 { AOUT_CHAN_CENTER
, 0 },
680 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
681 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
682 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
683 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
684 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
685 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
686 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
687 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
688 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
689 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
690 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
691 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, 0 },
692 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_CENTER
, 0 },
693 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_CENTER
, 0 },
694 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_CENTER
, 0 },
695 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_CENTER
, 0 },
696 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_CENTER
, 0 },
697 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
698 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
699 { AOUT_CHAN_LEFT
, AOUT_CHAN_RIGHT
, AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
701 static const unsigned p_aob_group2
[21][6] = {
704 { AOUT_CHAN_REARCENTER
, 0 },
705 { AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
706 { AOUT_CHAN_LFE
, 0 },
707 { AOUT_CHAN_LFE
, AOUT_CHAN_REARCENTER
, 0 },
708 { AOUT_CHAN_LFE
, AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
709 { AOUT_CHAN_CENTER
, 0 },
710 { AOUT_CHAN_CENTER
, AOUT_CHAN_REARCENTER
, 0 },
711 { AOUT_CHAN_CENTER
, AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
712 { AOUT_CHAN_CENTER
, AOUT_CHAN_LFE
, 0 },
713 { AOUT_CHAN_CENTER
, AOUT_CHAN_LFE
, AOUT_CHAN_REARCENTER
, 0 },
714 { AOUT_CHAN_CENTER
, AOUT_CHAN_LFE
, AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
715 { AOUT_CHAN_REARCENTER
, 0 },
716 { AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
717 { AOUT_CHAN_LFE
, 0 },
718 { AOUT_CHAN_LFE
, AOUT_CHAN_REARCENTER
, 0 },
719 { AOUT_CHAN_LFE
, AOUT_CHAN_REARLEFT
, AOUT_CHAN_REARRIGHT
, 0 },
720 { AOUT_CHAN_LFE
, 0 },
721 { AOUT_CHAN_CENTER
, 0 },
722 { AOUT_CHAN_CENTER
, AOUT_CHAN_LFE
, 0 },
725 static int AobHeader( unsigned *pi_rate
,
726 unsigned *pi_channels
, unsigned *pi_layout
,
728 unsigned *pi_padding
,
730 const uint8_t *p_header
)
732 const unsigned i_header_size
= GetWBE( &p_header
[1] );
733 if( i_header_size
+ 3 < LPCM_AOB_HEADER_LEN
)
736 *pi_padding
= 3+i_header_size
- LPCM_AOB_HEADER_LEN
;
738 const int i_index_size_g1
= (p_header
[6] >> 4) & 0x0f;
739 const int i_index_size_g2
= (p_header
[6] ) & 0x0f;
740 const int i_index_rate_g1
= (p_header
[7] >> 4) & 0x0f;
741 const int i_index_rate_g2
= (p_header
[7] ) & 0x0f;
742 const int i_assignment
= p_header
[9];
745 if( i_index_size_g1
> 0x02 ||
746 ( i_index_size_g2
!= 0x0f && i_index_size_g2
> 0x02 ) )
748 if( (i_index_rate_g1
& 0x07) > 0x02 ||
749 ( i_index_rate_g2
!= 0x0f && (i_index_rate_g1
& 0x07) > 0x02 ) )
751 if( i_assignment
> 20 )
755 *pi_bits
= 16 + 4 * i_index_size_g1
;
756 if( i_index_rate_g1
& 0x08 )
757 *pi_rate
= 44100 << (i_index_rate_g1
& 0x07);
759 *pi_rate
= 48000 << (i_index_rate_g1
& 0x07);
763 unsigned i_channels1
= 0;
764 unsigned i_layout1
= 0;
765 for( int i
= 0; p_aob_group1
[i_assignment
][i
] != 0; i
++ )
768 i_layout1
|= p_aob_group1
[i_assignment
][i
];
771 unsigned i_channels2
= 0;
772 unsigned i_layout2
= 0;
773 if( i_index_size_g2
!= 0x0f && i_index_rate_g2
!= 0x0f )
775 for( int i
= 0; p_aob_group2
[i_assignment
][i
] != 0; i
++ )
778 i_layout2
|= p_aob_group2
[i_assignment
][i
];
780 assert( (i_layout1
& i_layout2
) == 0 );
782 /* It is enabled only when presents and compatible wih group1 */
783 const bool b_group2_used
= i_index_size_g1
== i_index_size_g2
&&
784 i_index_rate_g1
== i_index_rate_g2
;
787 *pi_channels
= i_channels1
+ ( b_group2_used
? i_channels2
: 0 );
788 *pi_layout
= i_layout1
| ( b_group2_used
? i_layout2
: 0 );
791 for( unsigned i
= 0; i
< 2; i
++ )
793 const unsigned *p_aob
= i
== 0 ? p_aob_group1
[i_assignment
] :
794 p_aob_group2
[i_assignment
];
795 g
[i
].i_channels
= i
== 0 ? i_channels1
:
798 g
[i
].b_used
= i
== 0 || b_group2_used
;
801 for( unsigned j
= 0; j
< g
[i
].i_channels
; j
++ )
803 g
[i
].pi_position
[j
] = 0;
804 for( int k
= 0; pi_vlc_chan_order_wg4
[k
] != 0; k
++ )
806 const unsigned i_channel
= pi_vlc_chan_order_wg4
[k
];
807 if( i_channel
== p_aob
[j
] )
809 if( (*pi_layout
) & i_channel
)
810 g
[i
].pi_position
[j
]++;
817 static int BdHeader( unsigned *pi_rate
,
818 unsigned *pi_channels
, unsigned *pi_original_channels
,
820 const uint8_t *p_header
)
822 const uint32_t h
= GetDWBE( p_header
);
823 switch( ( h
& 0xf000) >> 12 )
827 *pi_original_channels
= AOUT_CHAN_CENTER
;
831 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
;
835 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_CENTER
;
839 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_REARCENTER
;
843 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_CENTER
|
844 AOUT_CHAN_REARCENTER
;
848 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
|
849 AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
;
853 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_CENTER
|
854 AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
;
858 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_CENTER
|
859 AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
|
864 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_CENTER
|
865 AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
|
866 AOUT_CHAN_MIDDLELEFT
| AOUT_CHAN_MIDDLERIGHT
;
870 *pi_original_channels
= AOUT_CHAN_LEFT
| AOUT_CHAN_RIGHT
| AOUT_CHAN_CENTER
|
871 AOUT_CHAN_REARLEFT
| AOUT_CHAN_REARRIGHT
|
872 AOUT_CHAN_MIDDLELEFT
| AOUT_CHAN_MIDDLERIGHT
|
879 switch( (h
>> 6) & 0x03 )
884 case 2: /* 20 bits but samples are stored on 24 bits */
885 case 3: /* 24 bits */
891 switch( (h
>> 8) & 0x0f )
908 static void VobExtract( aout_buffer_t
*p_aout_buffer
, block_t
*p_block
,
911 uint8_t *p_out
= p_aout_buffer
->p_buffer
;
913 /* 20/24 bits LPCM use special packing */
916 while( p_block
->i_buffer
/ 12 )
919 p_out
[0] = p_block
->p_buffer
[0];
920 p_out
[1] = p_block
->p_buffer
[1];
921 p_out
[2] = p_block
->p_buffer
[8];
923 p_out
[3] = p_block
->p_buffer
[2];
924 p_out
[4] = p_block
->p_buffer
[3];
925 p_out
[5] = p_block
->p_buffer
[9];
927 p_out
[6] = p_block
->p_buffer
[4];
928 p_out
[7] = p_block
->p_buffer
[5];
929 p_out
[8] = p_block
->p_buffer
[10];
931 p_out
[9] = p_block
->p_buffer
[6];
932 p_out
[10] = p_block
->p_buffer
[7];
933 p_out
[11] = p_block
->p_buffer
[11];
935 p_block
->i_buffer
-= 12;
936 p_block
->p_buffer
+= 12;
940 else if( i_bits
== 20 )
942 while( p_block
->i_buffer
/ 10 )
945 p_out
[0] = p_block
->p_buffer
[0];
946 p_out
[1] = p_block
->p_buffer
[1];
947 p_out
[2] = p_block
->p_buffer
[8] & 0xF0;
949 p_out
[3] = p_block
->p_buffer
[2];
950 p_out
[4] = p_block
->p_buffer
[3];
951 p_out
[5] = p_block
->p_buffer
[8] << 4;
953 p_out
[6] = p_block
->p_buffer
[4];
954 p_out
[7] = p_block
->p_buffer
[5];
955 p_out
[8] = p_block
->p_buffer
[9] & 0xF0;
957 p_out
[9] = p_block
->p_buffer
[6];
958 p_out
[10] = p_block
->p_buffer
[7];
959 p_out
[11] = p_block
->p_buffer
[9] << 4;
961 p_block
->i_buffer
-= 10;
962 p_block
->p_buffer
+= 10;
968 assert( i_bits
== 16 );
969 memcpy( p_out
, p_block
->p_buffer
, p_block
->i_buffer
);
972 static void AobExtract( aout_buffer_t
*p_aout_buffer
,
973 block_t
*p_block
, unsigned i_bits
, aob_group_t p_group
[2] )
975 const unsigned i_channels
= p_group
[0].i_channels
+
976 ( p_group
[1].b_used
? p_group
[1].i_channels
: 0 );
977 uint8_t *p_out
= p_aout_buffer
->p_buffer
;
979 while( p_block
->i_buffer
> 0 )
981 for( int i
= 0; i
< 2; i
++ )
983 const aob_group_t
*g
= &p_group
[1-i
];
984 const unsigned int i_group_size
= 2 * g
->i_channels
* i_bits
/ 8;
986 if( p_block
->i_buffer
< i_group_size
)
988 p_block
->i_buffer
= 0;
991 for( unsigned n
= 0; n
< 2; n
++ )
993 for( unsigned j
= 0; j
< g
->i_channels
&& g
->b_used
; j
++ )
995 const int i_src
= n
* g
->i_channels
+ j
;
996 const int i_dst
= n
* i_channels
+ g
->pi_position
[j
];
1000 p_out
[3*i_dst
+0] = p_block
->p_buffer
[2*i_src
+0];
1001 p_out
[3*i_dst
+1] = p_block
->p_buffer
[2*i_src
+1];
1002 p_out
[3*i_dst
+2] = p_block
->p_buffer
[4*g
->i_channels
+i_src
];
1004 else if( i_bits
== 20 )
1006 p_out
[3*i_dst
+0] = p_block
->p_buffer
[2*i_src
+0];
1007 p_out
[3*i_dst
+1] = p_block
->p_buffer
[2*i_src
+1];
1009 p_out
[3*i_dst
+2] = (p_block
->p_buffer
[4*g
->i_channels
+i_src
] ) & 0xf0;
1011 p_out
[3*i_dst
+2] = (p_block
->p_buffer
[4*g
->i_channels
+i_src
] << 4) & 0xf0;
1015 assert( i_bits
== 16 );
1016 p_out
[2*i_dst
+0] = p_block
->p_buffer
[2*i_src
+0];
1017 p_out
[2*i_dst
+1] = p_block
->p_buffer
[2*i_src
+1];
1022 p_block
->i_buffer
-= i_group_size
;
1023 p_block
->p_buffer
+= i_group_size
;
1026 p_out
+= (i_bits
== 16 ? 2 : 3) * i_channels
* 2;
1030 static void BdExtract( aout_buffer_t
*p_aout_buffer
, block_t
*p_block
)
1032 memcpy( p_aout_buffer
->p_buffer
, p_block
->p_buffer
, p_block
->i_buffer
);