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;
109 * - number of frames in this packet (8 bits)
110 * - first access unit (16 bits) == 0x0003 ?
114 * - current frame (5 bits)
115 * - quantisation (2 bits) 0 == 16bps, 1 == 20bps, 2 == 24bps, 3 == illegal
116 * - frequency (2 bits) 0 == 48 kHz, 1 == 96 kHz, 2 == 44.1 kHz, 3 == 32 kHz
118 * - number of channels - 1 (3 bits) 1 == 2 channels
119 * - dynamic range (8 bits) 0x80 == neutral
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 ||
438 ( p_enc->fmt_in.audio.i_rate != 48000 &&
439 p_enc->fmt_in.audio.i_rate != 96000 &&
440 p_enc->fmt_in.audio.i_rate != 44100 &&
441 p_enc->fmt_in.audio.i_rate != 32000 ) ||
442 p_enc->fmt_in.audio.i_channels > 8 )
445 /* Allocate the memory needed to store the encoder's structure */
446 if( ( p_enc->p_sys = p_sys =
447 (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
450 /* In DVD LCPM, a frame is always 150 PTS ticks. */
451 p_sys->i_frame_samples = p_enc->fmt_in.audio.i_rate * 150 / 90000;
452 p_sys->p_buffer = (uint8_t *)malloc(
453 p_sys->i_frame_samples *
454 p_enc->fmt_in.audio.i_channels *
455 p_enc->fmt_in.audio.i_bitspersample);
456 p_sys->i_buffer_used = 0;
457 p_sys->i_frame_num = 0;
459 p_sys->i_channels = p_enc->fmt_in.audio.i_channels;
460 p_sys->i_rate = p_enc->fmt_in.audio.i_rate;
462 p_enc->pf_encode_audio = EncodeFrames;
463 p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
465 p_enc->fmt_in.audio.i_bitspersample = 16;
466 p_enc->fmt_in.i_codec = VLC_CODEC_S16B;
468 p_enc->fmt_out.i_bitrate =
469 p_enc->fmt_in.audio.i_channels *
470 p_enc->fmt_in.audio.i_rate *
471 p_enc->fmt_in.audio.i_bitspersample *
472 (p_sys->i_frame_samples + LPCM_VOB_HEADER_LEN) /
473 p_sys->i_frame_samples;
478 /*****************************************************************************
479 * CloseEncoder: lpcm encoder destruction
480 *****************************************************************************/
481 static void CloseEncoder ( vlc_object_t *p_this )
486 /*****************************************************************************
487 * EncodeFrames: encode zero or more LCPM audio packets
488 *****************************************************************************/
489 static block_t *EncodeFrames( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
491 encoder_sys_t *p_sys = p_enc->p_sys;
492 block_t *p_first_block = NULL, *p_last_block = NULL;
494 if( !p_aout_buf || !p_aout_buf->i_buffer ) return NULL;
496 const int i_num_frames = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) /
497 p_sys->i_frame_samples;
498 const int i_leftover_samples = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) %
499 p_sys->i_frame_samples;
500 const int i_frame_size = p_sys->i_frame_samples * p_sys->i_channels * 2 + LPCM_VOB_HEADER_LEN;
501 const int i_start_offset = -p_sys->i_buffer_used;
503 uint8_t i_freq_code = 0;
505 switch( p_sys->i_rate ) {
520 int i_bytes_consumed = 0;
522 for ( int i = 0; i < i_num_frames; ++i )
524 block_t *p_block = block_New( p_enc, i_frame_size );
528 uint8_t *frame = (uint8_t *)p_block->p_buffer;
529 frame[0] = 1; /* one frame in packet */
531 frame[2] = 0; /* no first access unit */
532 frame[3] = (p_sys->i_frame_num + i) & 0x1f; /* no emphasis, no mute */
533 frame[4] = (i_freq_code << 4) | (p_sys->i_channels - 1);
534 frame[5] = 0x80; /* neutral dynamic range */
536 const int i_consume_samples = p_sys->i_frame_samples - p_sys->i_buffer_used;
537 const int i_kept_bytes = p_sys->i_buffer_used * p_sys->i_channels * 2;
538 const int i_consume_bytes = i_consume_samples * p_sys->i_channels * 2;
540 memcpy( frame + 6, p_sys->p_buffer, i_kept_bytes );
541 memcpy( frame + 6 + i_kept_bytes, p_aout_buf->p_buffer + i_bytes_consumed, i_consume_bytes );
543 p_sys->i_frame_num++;
544 p_sys->i_buffer_used = 0;
545 i_bytes_consumed += i_consume_bytes;
547 p_block->i_dts = p_block->i_pts = p_aout_buf->i_pts +
548 (i * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
549 p_block->i_length = p_sys->i_frame_samples * CLOCK_FREQ / p_sys->i_rate;
552 p_first_block = p_last_block = p_block;
554 p_last_block = p_last_block->p_next = p_block;
557 memcpy( p_sys->p_buffer,
558 p_aout_buf->p_buffer + i_bytes_consumed,
559 i_leftover_samples * p_sys->i_channels * 2 );
560 p_sys->i_buffer_used = i_leftover_samples;
562 return p_first_block;
566 /*****************************************************************************
568 *****************************************************************************/
569 static int VobHeader( unsigned *pi_rate,
570 unsigned *pi_channels, unsigned *pi_original_channels,
572 const uint8_t *p_header )
574 const uint8_t i_header = p_header[4];
576 switch( (i_header >> 4) & 0x3 )
592 *pi_channels = (i_header & 0x7) + 1;
593 switch( *pi_channels - 1 )
596 *pi_original_channels = AOUT_CHAN_CENTER;
599 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
602 /* This is unsure. */
603 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
606 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
607 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
610 /* This is unsure. */
611 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
612 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
616 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
617 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
618 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
621 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
622 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
623 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
624 | AOUT_CHAN_MIDDLERIGHT;
627 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
628 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
629 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
630 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
634 switch( (i_header >> 6) & 0x3 )
648 /* Check frame sync and drop it. */
649 if( p_header[5] != 0x80 )
654 static const unsigned p_aob_group1[21][6] = {
655 { AOUT_CHAN_CENTER, 0 },
656 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
657 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
658 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
659 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
660 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
661 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
662 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
663 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
664 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
665 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
666 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
667 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
668 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
669 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
670 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
671 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
672 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
673 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
674 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
675 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
677 static const unsigned p_aob_group2[21][6] = {
680 { AOUT_CHAN_REARCENTER, 0 },
681 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
682 { AOUT_CHAN_LFE, 0 },
683 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
684 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
685 { AOUT_CHAN_CENTER, 0 },
686 { AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, 0 },
687 { AOUT_CHAN_CENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
688 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
689 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
690 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
691 { AOUT_CHAN_REARCENTER, 0 },
692 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
693 { AOUT_CHAN_LFE, 0 },
694 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
695 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
696 { AOUT_CHAN_LFE, 0 },
697 { AOUT_CHAN_CENTER, 0 },
698 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
701 static int AobHeader( unsigned *pi_rate,
702 unsigned *pi_channels, unsigned *pi_layout,
704 unsigned *pi_padding,
706 const uint8_t *p_header )
708 const unsigned i_header_size = GetWBE( &p_header[1] );
709 if( i_header_size + 3 < LPCM_AOB_HEADER_LEN )
712 *pi_padding = 3+i_header_size - LPCM_AOB_HEADER_LEN;
714 const int i_index_size_g1 = (p_header[6] >> 4) & 0x0f;
715 const int i_index_size_g2 = (p_header[6] ) & 0x0f;
716 const int i_index_rate_g1 = (p_header[7] >> 4) & 0x0f;
717 const int i_index_rate_g2 = (p_header[7] ) & 0x0f;
718 const int i_assignment = p_header[9];
721 if( i_index_size_g1 > 0x02 ||
722 ( i_index_size_g2 != 0x0f && i_index_size_g2 > 0x02 ) )
724 if( (i_index_rate_g1 & 0x07) > 0x02 ||
725 ( i_index_rate_g2 != 0x0f && (i_index_rate_g1 & 0x07) > 0x02 ) )
727 if( i_assignment > 20 )
731 *pi_bits = 16 + 4 * i_index_size_g1;
732 if( i_index_rate_g1 & 0x08 )
733 *pi_rate = 44100 << (i_index_rate_g1 & 0x07);
735 *pi_rate = 48000 << (i_index_rate_g1 & 0x07);
739 unsigned i_channels1 = 0;
740 unsigned i_layout1 = 0;
741 for( int i = 0; p_aob_group1[i_assignment][i] != 0; i++ )
744 i_layout1 |= p_aob_group1[i_assignment][i];
747 unsigned i_channels2 = 0;
748 unsigned i_layout2 = 0;
749 if( i_index_size_g2 != 0x0f && i_index_rate_g2 != 0x0f )
751 for( int i = 0; p_aob_group2[i_assignment][i] != 0; i++ )
754 i_layout2 |= p_aob_group2[i_assignment][i];
756 assert( (i_layout1 & i_layout2) == 0 );
758 /* It is enabled only when presents and compatible wih group1 */
759 const bool b_group2_used = i_index_size_g1 == i_index_size_g2 &&
760 i_index_rate_g1 == i_index_rate_g2;
763 *pi_channels = i_channels1 + ( b_group2_used ? i_channels2 : 0 );
764 *pi_layout = i_layout1 | ( b_group2_used ? i_layout2 : 0 );
767 for( unsigned i = 0; i < 2; i++ )
769 const unsigned *p_aob = i == 0 ? p_aob_group1[i_assignment] :
770 p_aob_group2[i_assignment];
771 g[i].i_channels = i == 0 ? i_channels1 :
774 g[i].b_used = i == 0 || b_group2_used;
777 for( unsigned j = 0; j < g[i].i_channels; j++ )
779 g[i].pi_position[j] = 0;
780 for( int k = 0; pi_vlc_chan_order_wg4[k] != 0; k++ )
782 const unsigned i_channel = pi_vlc_chan_order_wg4[k];
783 if( i_channel == p_aob[j] )
785 if( (*pi_layout) & i_channel )
786 g[i].pi_position[j]++;
793 static int BdHeader( unsigned *pi_rate,
794 unsigned *pi_channels, unsigned *pi_original_channels,
796 const uint8_t *p_header )
798 const uint32_t h = GetDWBE( p_header );
799 switch( ( h & 0xf000) >> 12 )
803 *pi_original_channels = AOUT_CHAN_CENTER;
807 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
811 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
815 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
819 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
820 AOUT_CHAN_REARCENTER;
824 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
825 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
829 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
830 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
834 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
835 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
840 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
841 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
842 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT;
846 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
847 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
848 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
855 switch( (h >> 6) & 0x03 )
860 case 2: /* 20 bits but samples are stored on 24 bits */
861 case 3: /* 24 bits */
867 switch( (h >> 8) & 0x0f )
884 static void VobExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
887 uint8_t *p_out = p_aout_buffer->p_buffer;
889 /* 20/24 bits LPCM use special packing */
892 while( p_block->i_buffer / 12 )
895 p_out[0] = p_block->p_buffer[0];
896 p_out[1] = p_block->p_buffer[1];
897 p_out[2] = p_block->p_buffer[8];
899 p_out[3] = p_block->p_buffer[2];
900 p_out[4] = p_block->p_buffer[3];
901 p_out[5] = p_block->p_buffer[9];
903 p_out[6] = p_block->p_buffer[4];
904 p_out[7] = p_block->p_buffer[5];
905 p_out[8] = p_block->p_buffer[10];
907 p_out[9] = p_block->p_buffer[6];
908 p_out[10] = p_block->p_buffer[7];
909 p_out[11] = p_block->p_buffer[11];
911 p_block->i_buffer -= 12;
912 p_block->p_buffer += 12;
916 else if( i_bits == 20 )
918 while( p_block->i_buffer / 10 )
921 p_out[0] = p_block->p_buffer[0];
922 p_out[1] = p_block->p_buffer[1];
923 p_out[2] = p_block->p_buffer[8] & 0xF0;
925 p_out[3] = p_block->p_buffer[2];
926 p_out[4] = p_block->p_buffer[3];
927 p_out[5] = p_block->p_buffer[8] << 4;
929 p_out[6] = p_block->p_buffer[4];
930 p_out[7] = p_block->p_buffer[5];
931 p_out[8] = p_block->p_buffer[9] & 0xF0;
933 p_out[9] = p_block->p_buffer[6];
934 p_out[10] = p_block->p_buffer[7];
935 p_out[11] = p_block->p_buffer[9] << 4;
937 p_block->i_buffer -= 10;
938 p_block->p_buffer += 10;
944 assert( i_bits == 16 );
945 memcpy( p_out, p_block->p_buffer, p_block->i_buffer );
948 static void AobExtract( aout_buffer_t *p_aout_buffer,
949 block_t *p_block, unsigned i_bits, aob_group_t p_group[2] )
951 const unsigned i_channels = p_group[0].i_channels +
952 ( p_group[1].b_used ? p_group[1].i_channels : 0 );
953 uint8_t *p_out = p_aout_buffer->p_buffer;
955 while( p_block->i_buffer > 0 )
957 for( int i = 0; i < 2; i++ )
959 const aob_group_t *g = &p_group[1-i];
960 const unsigned int i_group_size = 2 * g->i_channels * i_bits / 8;
962 if( p_block->i_buffer < i_group_size )
964 p_block->i_buffer = 0;
967 for( unsigned n = 0; n < 2; n++ )
969 for( unsigned j = 0; j < g->i_channels && g->b_used; j++ )
971 const int i_src = n * g->i_channels + j;
972 const int i_dst = n * i_channels + g->pi_position[j];
976 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
977 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
978 p_out[3*i_dst+2] = p_block->p_buffer[4*g->i_channels+i_src];
980 else if( i_bits == 20 )
982 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
983 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
985 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] ) & 0xf0;
987 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] << 4) & 0xf0;
991 assert( i_bits == 16 );
992 p_out[2*i_dst+0] = p_block->p_buffer[2*i_src+0];
993 p_out[2*i_dst+1] = p_block->p_buffer[2*i_src+1];
998 p_block->i_buffer -= i_group_size;
999 p_block->p_buffer += i_group_size;
1002 p_out += (i_bits == 16 ? 2 : 3) * i_channels * 2;
1006 static void BdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block )
1008 memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );