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 >
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
26 *****************************************************************************/
28 /*****************************************************************************
30 *****************************************************************************/
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
37 #include <vlc_codec.h>
41 /*****************************************************************************
43 *****************************************************************************/
44 static int OpenDecoder ( vlc_object_t * );
45 static int OpenPacketizer( vlc_object_t * );
46 static void CloseCommon ( vlc_object_t * );
49 static int OpenEncoder ( vlc_object_t * );
50 static void CloseEncoder ( vlc_object_t * );
51 static block_t *EncodeFrames( encoder_t *, aout_buffer_t * );
56 set_category( CAT_INPUT )
57 set_subcategory( SUBCAT_INPUT_ACODEC )
58 set_description( N_("Linear PCM audio decoder") )
59 set_capability( "decoder", 100 )
60 set_callbacks( OpenDecoder, CloseCommon )
63 set_description( N_("Linear PCM audio packetizer") )
64 set_capability( "packetizer", 100 )
65 set_callbacks( OpenPacketizer, CloseCommon )
69 set_description( N_("Linear PCM audio encoder") )
70 set_capability( "encoder", 100 )
71 set_callbacks( OpenEncoder, CloseEncoder )
72 add_shortcut( "lpcm" )
78 /*****************************************************************************
79 * decoder_sys_t : lpcm decoder descriptor
80 *****************************************************************************/
92 unsigned i_header_size;
111 * - frame number (8 bits)
112 * - unknown (16 bits) == 0x0003 ?
114 * - current frame (4 bits)
116 * - frequency (2 bits) 0 == 48 kHz, 1 == 32 kHz, 2 == ?, 3 == ?
118 * - number of channels - 1 (3 bits) 1 == 2 channels
119 * - start code (8 bits) == 0x80
121 * LPCM DVD-A header (http://dvd-audio.sourceforge.net/spec/aob.shtml)
122 * - continuity counter (8 bits, clipped to 0x00-0x1f)
123 * - header size (16 bits)
124 * - byte pointer to start of first audio frame.
125 * - unknown (8bits, 0x10 for stereo, 0x00 for surround)
126 * - sample size (4+4 bits)
127 * - samplerate (4+4 bits)
129 * - group assignment (8 bits)
131 * - padding(variable)
135 * - number of channels (4 bits)
136 * - frequency (4 bits)
137 * - bits per sample (2 bits)
141 #define LPCM_VOB_HEADER_LEN (6)
142 #define LPCM_AOB_HEADER_LEN (11)
143 #define LPCM_BD_HEADER_LEN (4)
156 unsigned pi_position[6];
159 /*****************************************************************************
161 *****************************************************************************/
162 static void *DecodeFrame ( decoder_t *, block_t ** );
165 static int VobHeader( unsigned *pi_rate,
166 unsigned *pi_channels, unsigned *pi_original_channels,
168 const uint8_t *p_header );
169 static void VobExtract( aout_buffer_t *, block_t *, unsigned i_bits );
171 static int AobHeader( unsigned *pi_rate,
172 unsigned *pi_channels, unsigned *pi_layout,
174 unsigned *pi_padding,
176 const uint8_t *p_header );
177 static void AobExtract( aout_buffer_t *, block_t *, unsigned i_bits, aob_group_t p_group[2] );
179 static int BdHeader( unsigned *pi_rate,
180 unsigned *pi_channels, unsigned *pi_original_channels,
182 const uint8_t *p_header );
183 static void BdExtract( aout_buffer_t *, block_t * );
186 /*****************************************************************************
188 *****************************************************************************/
189 static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
191 decoder_t *p_dec = (decoder_t*)p_this;
192 decoder_sys_t *p_sys;
196 switch( p_dec->fmt_in.i_codec )
199 case VLC_CODEC_DVD_LPCM:
201 i_header_size = LPCM_VOB_HEADER_LEN;
204 case VLC_CODEC_DVDA_LPCM:
206 i_header_size = LPCM_AOB_HEADER_LEN;
209 case VLC_CODEC_BD_LPCM:
211 i_header_size = LPCM_BD_HEADER_LEN;
217 /* Allocate the memory needed to store the decoder's structure */
218 if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
222 p_sys->b_packetizer = b_packetizer;
223 date_Set( &p_sys->end_date, 0 );
224 p_sys->i_type = i_type;
225 p_sys->i_header_size = i_header_size;
227 /* Set output properties */
228 p_dec->fmt_out.i_cat = AUDIO_ES;
235 p_dec->fmt_out.i_codec = VLC_CODEC_DVD_LPCM;
238 p_dec->fmt_out.i_codec = VLC_CODEC_DVDA_LPCM;
243 p_dec->fmt_out.i_codec = VLC_CODEC_BD_LPCM;
249 switch( p_dec->fmt_out.audio.i_bitspersample )
253 p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
254 p_dec->fmt_out.audio.i_bitspersample = 24;
257 p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
258 p_dec->fmt_out.audio.i_bitspersample = 16;
264 p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
266 p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
271 static int OpenDecoder( vlc_object_t *p_this )
273 return OpenCommon( p_this, false );
275 static int OpenPacketizer( vlc_object_t *p_this )
277 return OpenCommon( p_this, true );
280 /*****************************************************************************
281 * DecodeFrame: decodes an lpcm frame.
282 ****************************************************************************
283 * Beware, this function must be fed with complete frames (PES packet).
284 *****************************************************************************/
285 static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
287 decoder_sys_t *p_sys = p_dec->p_sys;
289 unsigned int i_rate = 0, i_original_channels = 0, i_channels = 0, i_bits = 0;
292 if( !pp_block || !*pp_block ) return NULL;
295 *pp_block = NULL; /* So the packet doesn't get re-sent */
297 /* Date management */
298 if( p_block->i_pts > VLC_TS_INVALID &&
299 p_block->i_pts != date_Get( &p_sys->end_date ) )
301 date_Set( &p_sys->end_date, p_block->i_pts );
304 if( !date_Get( &p_sys->end_date ) )
306 /* We've just started the stream, wait for the first PTS. */
307 block_Release( p_block );
311 if( p_block->i_buffer <= p_sys->i_header_size )
313 msg_Err(p_dec, "frame is too short");
314 block_Release( p_block );
319 unsigned i_padding = 0;
320 aob_group_t p_aob_group[2];
321 switch( p_sys->i_type )
324 i_ret = VobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
328 i_ret = AobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits, &i_padding,
333 i_ret = BdHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
340 if( i_ret || p_block->i_buffer <= p_sys->i_header_size + i_padding )
342 msg_Warn( p_dec, "no frame sync or too small frame" );
343 block_Release( p_block );
347 /* Set output properties */
348 if( p_dec->fmt_out.audio.i_rate != i_rate )
350 date_Init( &p_sys->end_date, i_rate, 1 );
351 date_Set( &p_sys->end_date, p_block->i_pts );
353 p_dec->fmt_out.audio.i_rate = i_rate;
354 p_dec->fmt_out.audio.i_channels = i_channels;
355 p_dec->fmt_out.audio.i_original_channels = i_original_channels;
356 p_dec->fmt_out.audio.i_physical_channels = i_original_channels & AOUT_CHAN_PHYSMASK;
358 i_frame_length = (p_block->i_buffer - p_sys->i_header_size - i_padding) / i_channels * 8 / i_bits;
360 if( p_sys->b_packetizer )
362 p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
364 date_Increment( &p_sys->end_date, i_frame_length ) -
367 /* Just pass on the incoming frame */
375 p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
376 p_dec->fmt_out.audio.i_bitspersample = 16;
380 p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
381 p_dec->fmt_out.audio.i_bitspersample = 24;
385 aout_buffer_t *p_aout_buffer;
386 p_aout_buffer = decoder_NewAudioBuffer( p_dec, i_frame_length );
390 p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
391 p_aout_buffer->i_length =
392 date_Increment( &p_sys->end_date, i_frame_length )
393 - p_aout_buffer->i_pts;
395 p_block->p_buffer += p_sys->i_header_size + i_padding;
396 p_block->i_buffer -= p_sys->i_header_size + i_padding;
398 switch( p_sys->i_type )
401 VobExtract( p_aout_buffer, p_block, i_bits );
404 AobExtract( p_aout_buffer, p_block, i_bits, p_aob_group );
409 BdExtract( p_aout_buffer, p_block );
413 block_Release( p_block );
414 return p_aout_buffer;
418 /*****************************************************************************
419 * CloseCommon : lpcm decoder destruction
420 *****************************************************************************/
421 static void CloseCommon( vlc_object_t *p_this )
423 decoder_t *p_dec = (decoder_t*)p_this;
424 free( p_dec->p_sys );
428 /*****************************************************************************
429 * OpenEncoder: lpcm encoder construction
430 *****************************************************************************/
431 static int OpenEncoder( vlc_object_t *p_this )
433 encoder_t *p_enc = (encoder_t *)p_this;
434 encoder_sys_t *p_sys;
436 /* We only support DVD LPCM yet. */
437 if( p_enc->fmt_out.i_codec != VLC_CODEC_DVD_LPCM )
440 if( p_enc->fmt_in.audio.i_rate != 48000 &&
441 p_enc->fmt_in.audio.i_rate != 96000 &&
442 p_enc->fmt_in.audio.i_rate != 44100 &&
443 p_enc->fmt_in.audio.i_rate != 32000 )
445 msg_Err( p_enc, "DVD LPCM supports only sample rates of 48, 96, 44.1 or 32 kHz" );
449 if( p_enc->fmt_in.audio.i_channels > 8 )
451 msg_Err( p_enc, "DVD LPCM supports a maximum of eight channels" );
455 /* Allocate the memory needed to store the encoder's structure */
456 if( ( p_enc->p_sys = p_sys =
457 (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
460 /* In DVD LCPM, a frame is always 150 PTS ticks. */
461 p_sys->i_frame_samples = p_enc->fmt_in.audio.i_rate * 150 / 90000;
462 p_sys->p_buffer = (uint8_t *)malloc(
463 p_sys->i_frame_samples *
464 p_enc->fmt_in.audio.i_channels *
465 p_enc->fmt_in.audio.i_bitspersample);
466 p_sys->i_buffer_used = 0;
467 p_sys->i_frame_num = 0;
469 p_sys->i_channels = p_enc->fmt_in.audio.i_channels;
470 p_sys->i_rate = p_enc->fmt_in.audio.i_rate;
472 p_enc->pf_encode_audio = EncodeFrames;
473 p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
475 p_enc->fmt_in.audio.i_bitspersample = 16;
476 p_enc->fmt_in.i_codec = VLC_CODEC_S16B;
478 p_enc->fmt_out.i_bitrate =
479 p_enc->fmt_in.audio.i_channels *
480 p_enc->fmt_in.audio.i_rate *
481 p_enc->fmt_in.audio.i_bitspersample *
482 (p_sys->i_frame_samples + LPCM_VOB_HEADER_LEN) /
483 p_sys->i_frame_samples;
488 /*****************************************************************************
489 * CloseEncoder: lpcm encoder destruction
490 *****************************************************************************/
491 static void CloseEncoder ( vlc_object_t *p_this )
496 /*****************************************************************************
497 * EncodeFrames: encode zero or more LCPM audio packets
498 *****************************************************************************/
499 static block_t *EncodeFrames( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
501 encoder_sys_t *p_sys = p_enc->p_sys;
502 block_t *p_first_block = NULL, *p_last_block = NULL;
504 if( !p_aout_buf || !p_aout_buf->i_buffer ) return NULL;
506 const int i_num_frames = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) /
507 p_sys->i_frame_samples;
508 const int i_leftover_samples = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) %
509 p_sys->i_frame_samples;
510 const int i_frame_size = p_sys->i_frame_samples * p_sys->i_channels * 2 + LPCM_VOB_HEADER_LEN;
511 const int i_start_offset = -p_sys->i_buffer_used;
513 uint8_t i_freq_code = 0;
515 switch( p_sys->i_rate ) {
532 int i_bytes_consumed = 0;
534 for ( int i = 0; i < i_num_frames; ++i )
536 block_t *p_block = block_New( p_enc, i_frame_size );
540 uint8_t *frame = (uint8_t *)p_block->p_buffer;
541 frame[0] = 1; /* one frame in packet */
543 frame[2] = 0; /* no first access unit */
544 frame[3] = (p_sys->i_frame_num + i) & 0x1f; /* no emphasis, no mute */
545 frame[4] = (i_freq_code << 4) | (p_sys->i_channels - 1);
546 frame[5] = 0x80; /* neutral dynamic range */
548 const int i_consume_samples = p_sys->i_frame_samples - p_sys->i_buffer_used;
549 const int i_kept_bytes = p_sys->i_buffer_used * p_sys->i_channels * 2;
550 const int i_consume_bytes = i_consume_samples * p_sys->i_channels * 2;
552 memcpy( frame + 6, p_sys->p_buffer, i_kept_bytes );
553 memcpy( frame + 6 + i_kept_bytes, p_aout_buf->p_buffer + i_bytes_consumed, i_consume_bytes );
555 p_sys->i_frame_num++;
556 p_sys->i_buffer_used = 0;
557 i_bytes_consumed += i_consume_bytes;
559 p_block->i_dts = p_block->i_pts = p_aout_buf->i_pts +
560 (i * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
561 p_block->i_length = p_sys->i_frame_samples * CLOCK_FREQ / p_sys->i_rate;
564 p_first_block = p_last_block = p_block;
566 p_last_block = p_last_block->p_next = p_block;
569 memcpy( p_sys->p_buffer,
570 p_aout_buf->p_buffer + i_bytes_consumed,
571 i_leftover_samples * p_sys->i_channels * 2 );
572 p_sys->i_buffer_used = i_leftover_samples;
574 return p_first_block;
578 /*****************************************************************************
580 *****************************************************************************/
581 static int VobHeader( unsigned *pi_rate,
582 unsigned *pi_channels, unsigned *pi_original_channels,
584 const uint8_t *p_header )
586 const uint8_t i_header = p_header[4];
588 switch( (i_header >> 4) & 0x3 )
604 *pi_channels = (i_header & 0x7) + 1;
605 switch( *pi_channels - 1 )
608 *pi_original_channels = AOUT_CHAN_CENTER;
611 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
614 /* This is unsure. */
615 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
618 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
619 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
622 /* This is unsure. */
623 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
624 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
628 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
629 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
630 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
633 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
634 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
635 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
636 | AOUT_CHAN_MIDDLERIGHT;
639 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
640 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
641 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
642 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
646 switch( (i_header >> 6) & 0x3 )
660 /* Check frame sync and drop it. */
661 if( p_header[5] != 0x80 )
666 static const unsigned p_aob_group1[21][6] = {
667 { AOUT_CHAN_CENTER, 0 },
668 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
669 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
670 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
671 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
672 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
673 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
674 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
675 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
676 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
677 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
678 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
679 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
680 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
681 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
682 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
683 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
684 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
685 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
686 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
687 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
689 static const unsigned p_aob_group2[21][6] = {
692 { AOUT_CHAN_REARCENTER, 0 },
693 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
694 { AOUT_CHAN_LFE, 0 },
695 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
696 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
697 { AOUT_CHAN_CENTER, 0 },
698 { AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, 0 },
699 { AOUT_CHAN_CENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
700 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
701 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
702 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
703 { AOUT_CHAN_REARCENTER, 0 },
704 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
705 { AOUT_CHAN_LFE, 0 },
706 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
707 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
708 { AOUT_CHAN_LFE, 0 },
709 { AOUT_CHAN_CENTER, 0 },
710 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
713 static int AobHeader( unsigned *pi_rate,
714 unsigned *pi_channels, unsigned *pi_layout,
716 unsigned *pi_padding,
718 const uint8_t *p_header )
720 const unsigned i_header_size = GetWBE( &p_header[1] );
721 if( i_header_size + 3 < LPCM_AOB_HEADER_LEN )
724 *pi_padding = 3+i_header_size - LPCM_AOB_HEADER_LEN;
726 const int i_index_size_g1 = (p_header[6] >> 4) & 0x0f;
727 const int i_index_size_g2 = (p_header[6] ) & 0x0f;
728 const int i_index_rate_g1 = (p_header[7] >> 4) & 0x0f;
729 const int i_index_rate_g2 = (p_header[7] ) & 0x0f;
730 const int i_assignment = p_header[9];
733 if( i_index_size_g1 > 0x02 ||
734 ( i_index_size_g2 != 0x0f && i_index_size_g2 > 0x02 ) )
736 if( (i_index_rate_g1 & 0x07) > 0x02 ||
737 ( i_index_rate_g2 != 0x0f && (i_index_rate_g1 & 0x07) > 0x02 ) )
739 if( i_assignment > 20 )
743 *pi_bits = 16 + 4 * i_index_size_g1;
744 if( i_index_rate_g1 & 0x08 )
745 *pi_rate = 44100 << (i_index_rate_g1 & 0x07);
747 *pi_rate = 48000 << (i_index_rate_g1 & 0x07);
751 unsigned i_channels1 = 0;
752 unsigned i_layout1 = 0;
753 for( int i = 0; p_aob_group1[i_assignment][i] != 0; i++ )
756 i_layout1 |= p_aob_group1[i_assignment][i];
759 unsigned i_channels2 = 0;
760 unsigned i_layout2 = 0;
761 if( i_index_size_g2 != 0x0f && i_index_rate_g2 != 0x0f )
763 for( int i = 0; p_aob_group2[i_assignment][i] != 0; i++ )
766 i_layout2 |= p_aob_group2[i_assignment][i];
768 assert( (i_layout1 & i_layout2) == 0 );
770 /* It is enabled only when presents and compatible wih group1 */
771 const bool b_group2_used = i_index_size_g1 == i_index_size_g2 &&
772 i_index_rate_g1 == i_index_rate_g2;
775 *pi_channels = i_channels1 + ( b_group2_used ? i_channels2 : 0 );
776 *pi_layout = i_layout1 | ( b_group2_used ? i_layout2 : 0 );
779 for( unsigned i = 0; i < 2; i++ )
781 const unsigned *p_aob = i == 0 ? p_aob_group1[i_assignment] :
782 p_aob_group2[i_assignment];
783 g[i].i_channels = i == 0 ? i_channels1 :
786 g[i].b_used = i == 0 || b_group2_used;
789 for( unsigned j = 0; j < g[i].i_channels; j++ )
791 g[i].pi_position[j] = 0;
792 for( int k = 0; pi_vlc_chan_order_wg4[k] != 0; k++ )
794 const unsigned i_channel = pi_vlc_chan_order_wg4[k];
795 if( i_channel == p_aob[j] )
797 if( (*pi_layout) & i_channel )
798 g[i].pi_position[j]++;
805 static int BdHeader( unsigned *pi_rate,
806 unsigned *pi_channels, unsigned *pi_original_channels,
808 const uint8_t *p_header )
810 const uint32_t h = GetDWBE( p_header );
811 switch( ( h & 0xf000) >> 12 )
815 *pi_original_channels = AOUT_CHAN_CENTER;
819 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
823 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
827 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
831 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
832 AOUT_CHAN_REARCENTER;
836 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
837 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
841 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
842 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
846 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
847 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
852 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
853 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
854 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT;
858 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
859 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
860 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
867 switch( (h >> 6) & 0x03 )
872 case 2: /* 20 bits but samples are stored on 24 bits */
873 case 3: /* 24 bits */
879 switch( (h >> 8) & 0x0f )
896 static void VobExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
899 uint8_t *p_out = p_aout_buffer->p_buffer;
901 /* 20/24 bits LPCM use special packing */
904 while( p_block->i_buffer / 12 )
907 p_out[0] = p_block->p_buffer[0];
908 p_out[1] = p_block->p_buffer[1];
909 p_out[2] = p_block->p_buffer[8];
911 p_out[3] = p_block->p_buffer[2];
912 p_out[4] = p_block->p_buffer[3];
913 p_out[5] = p_block->p_buffer[9];
915 p_out[6] = p_block->p_buffer[4];
916 p_out[7] = p_block->p_buffer[5];
917 p_out[8] = p_block->p_buffer[10];
919 p_out[9] = p_block->p_buffer[6];
920 p_out[10] = p_block->p_buffer[7];
921 p_out[11] = p_block->p_buffer[11];
923 p_block->i_buffer -= 12;
924 p_block->p_buffer += 12;
928 else if( i_bits == 20 )
930 while( p_block->i_buffer / 10 )
933 p_out[0] = p_block->p_buffer[0];
934 p_out[1] = p_block->p_buffer[1];
935 p_out[2] = p_block->p_buffer[8] & 0xF0;
937 p_out[3] = p_block->p_buffer[2];
938 p_out[4] = p_block->p_buffer[3];
939 p_out[5] = p_block->p_buffer[8] << 4;
941 p_out[6] = p_block->p_buffer[4];
942 p_out[7] = p_block->p_buffer[5];
943 p_out[8] = p_block->p_buffer[9] & 0xF0;
945 p_out[9] = p_block->p_buffer[6];
946 p_out[10] = p_block->p_buffer[7];
947 p_out[11] = p_block->p_buffer[9] << 4;
949 p_block->i_buffer -= 10;
950 p_block->p_buffer += 10;
956 assert( i_bits == 16 );
957 memcpy( p_out, p_block->p_buffer, p_block->i_buffer );
960 static void AobExtract( aout_buffer_t *p_aout_buffer,
961 block_t *p_block, unsigned i_bits, aob_group_t p_group[2] )
963 const unsigned i_channels = p_group[0].i_channels +
964 ( p_group[1].b_used ? p_group[1].i_channels : 0 );
965 uint8_t *p_out = p_aout_buffer->p_buffer;
967 while( p_block->i_buffer > 0 )
969 for( int i = 0; i < 2; i++ )
971 const aob_group_t *g = &p_group[1-i];
972 const unsigned int i_group_size = 2 * g->i_channels * i_bits / 8;
974 if( p_block->i_buffer < i_group_size )
976 p_block->i_buffer = 0;
979 for( unsigned n = 0; n < 2; n++ )
981 for( unsigned j = 0; j < g->i_channels && g->b_used; j++ )
983 const int i_src = n * g->i_channels + j;
984 const int i_dst = n * i_channels + g->pi_position[j];
988 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
989 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
990 p_out[3*i_dst+2] = p_block->p_buffer[4*g->i_channels+i_src];
992 else if( i_bits == 20 )
994 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
995 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
997 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] ) & 0xf0;
999 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] << 4) & 0xf0;
1003 assert( i_bits == 16 );
1004 p_out[2*i_dst+0] = p_block->p_buffer[2*i_src+0];
1005 p_out[2*i_dst+1] = p_block->p_buffer[2*i_src+1];
1010 p_block->i_buffer -= i_group_size;
1011 p_block->p_buffer += i_group_size;
1014 p_out += (i_bits == 16 ? 2 : 3) * i_channels * 2;
1018 static void BdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block )
1020 memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );