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 )
499 /*****************************************************************************
500 * EncodeFrames: encode zero or more LCPM audio packets
501 *****************************************************************************/
502 static block_t *EncodeFrames( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
504 encoder_sys_t *p_sys = p_enc->p_sys;
505 block_t *p_first_block = NULL, *p_last_block = NULL;
507 if( !p_aout_buf || !p_aout_buf->i_buffer ) return NULL;
509 const int i_num_frames = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) /
510 p_sys->i_frame_samples;
511 const int i_leftover_samples = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) %
512 p_sys->i_frame_samples;
513 const int i_frame_size = p_sys->i_frame_samples * p_sys->i_channels * 2 + LPCM_VOB_HEADER_LEN;
514 const int i_start_offset = -p_sys->i_buffer_used;
516 uint8_t i_freq_code = 0;
518 switch( p_sys->i_rate ) {
535 int i_bytes_consumed = 0;
537 for ( int i = 0; i < i_num_frames; ++i )
539 block_t *p_block = block_New( p_enc, i_frame_size );
543 uint8_t *frame = (uint8_t *)p_block->p_buffer;
544 frame[0] = 1; /* one frame in packet */
546 frame[2] = 0; /* no first access unit */
547 frame[3] = (p_sys->i_frame_num + i) & 0x1f; /* no emphasis, no mute */
548 frame[4] = (i_freq_code << 4) | (p_sys->i_channels - 1);
549 frame[5] = 0x80; /* neutral dynamic range */
551 const int i_consume_samples = p_sys->i_frame_samples - p_sys->i_buffer_used;
552 const int i_kept_bytes = p_sys->i_buffer_used * p_sys->i_channels * 2;
553 const int i_consume_bytes = i_consume_samples * p_sys->i_channels * 2;
555 memcpy( frame + 6, p_sys->p_buffer, i_kept_bytes );
556 memcpy( frame + 6 + i_kept_bytes, p_aout_buf->p_buffer + i_bytes_consumed, i_consume_bytes );
558 p_sys->i_frame_num++;
559 p_sys->i_buffer_used = 0;
560 i_bytes_consumed += i_consume_bytes;
562 /* We need to find i_length by means of next_pts due to possible roundoff errors. */
563 mtime_t this_pts = p_aout_buf->i_pts +
564 (i * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
565 mtime_t next_pts = p_aout_buf->i_pts +
566 ((i + 1) * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
568 p_block->i_pts = p_block->i_dts = this_pts;
569 p_block->i_length = next_pts - this_pts;
572 p_first_block = p_last_block = p_block;
574 p_last_block = p_last_block->p_next = p_block;
577 memcpy( p_sys->p_buffer,
578 p_aout_buf->p_buffer + i_bytes_consumed,
579 i_leftover_samples * p_sys->i_channels * 2 );
580 p_sys->i_buffer_used = i_leftover_samples;
582 return p_first_block;
586 /*****************************************************************************
588 *****************************************************************************/
589 static int VobHeader( unsigned *pi_rate,
590 unsigned *pi_channels, unsigned *pi_original_channels,
592 const uint8_t *p_header )
594 const uint8_t i_header = p_header[4];
596 switch( (i_header >> 4) & 0x3 )
612 *pi_channels = (i_header & 0x7) + 1;
613 switch( *pi_channels - 1 )
616 *pi_original_channels = AOUT_CHAN_CENTER;
619 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
622 /* This is unsure. */
623 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
626 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
627 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
630 /* This is unsure. */
631 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
632 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
636 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
637 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
638 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
641 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
642 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
643 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
644 | AOUT_CHAN_MIDDLERIGHT;
647 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
648 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
649 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
650 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
654 switch( (i_header >> 6) & 0x3 )
668 /* Check frame sync and drop it. */
669 if( p_header[5] != 0x80 )
674 static const unsigned p_aob_group1[21][6] = {
675 { AOUT_CHAN_CENTER, 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, 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, AOUT_CHAN_CENTER, 0 },
689 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
690 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
691 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
692 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
693 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
694 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
695 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
697 static const unsigned p_aob_group2[21][6] = {
700 { AOUT_CHAN_REARCENTER, 0 },
701 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
702 { AOUT_CHAN_LFE, 0 },
703 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
704 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
705 { AOUT_CHAN_CENTER, 0 },
706 { AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, 0 },
707 { AOUT_CHAN_CENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
708 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
709 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
710 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
711 { AOUT_CHAN_REARCENTER, 0 },
712 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
713 { AOUT_CHAN_LFE, 0 },
714 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
715 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
716 { AOUT_CHAN_LFE, 0 },
717 { AOUT_CHAN_CENTER, 0 },
718 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
721 static int AobHeader( unsigned *pi_rate,
722 unsigned *pi_channels, unsigned *pi_layout,
724 unsigned *pi_padding,
726 const uint8_t *p_header )
728 const unsigned i_header_size = GetWBE( &p_header[1] );
729 if( i_header_size + 3 < LPCM_AOB_HEADER_LEN )
732 *pi_padding = 3+i_header_size - LPCM_AOB_HEADER_LEN;
734 const int i_index_size_g1 = (p_header[6] >> 4) & 0x0f;
735 const int i_index_size_g2 = (p_header[6] ) & 0x0f;
736 const int i_index_rate_g1 = (p_header[7] >> 4) & 0x0f;
737 const int i_index_rate_g2 = (p_header[7] ) & 0x0f;
738 const int i_assignment = p_header[9];
741 if( i_index_size_g1 > 0x02 ||
742 ( i_index_size_g2 != 0x0f && i_index_size_g2 > 0x02 ) )
744 if( (i_index_rate_g1 & 0x07) > 0x02 ||
745 ( i_index_rate_g2 != 0x0f && (i_index_rate_g1 & 0x07) > 0x02 ) )
747 if( i_assignment > 20 )
751 *pi_bits = 16 + 4 * i_index_size_g1;
752 if( i_index_rate_g1 & 0x08 )
753 *pi_rate = 44100 << (i_index_rate_g1 & 0x07);
755 *pi_rate = 48000 << (i_index_rate_g1 & 0x07);
759 unsigned i_channels1 = 0;
760 unsigned i_layout1 = 0;
761 for( int i = 0; p_aob_group1[i_assignment][i] != 0; i++ )
764 i_layout1 |= p_aob_group1[i_assignment][i];
767 unsigned i_channels2 = 0;
768 unsigned i_layout2 = 0;
769 if( i_index_size_g2 != 0x0f && i_index_rate_g2 != 0x0f )
771 for( int i = 0; p_aob_group2[i_assignment][i] != 0; i++ )
774 i_layout2 |= p_aob_group2[i_assignment][i];
776 assert( (i_layout1 & i_layout2) == 0 );
778 /* It is enabled only when presents and compatible wih group1 */
779 const bool b_group2_used = i_index_size_g1 == i_index_size_g2 &&
780 i_index_rate_g1 == i_index_rate_g2;
783 *pi_channels = i_channels1 + ( b_group2_used ? i_channels2 : 0 );
784 *pi_layout = i_layout1 | ( b_group2_used ? i_layout2 : 0 );
787 for( unsigned i = 0; i < 2; i++ )
789 const unsigned *p_aob = i == 0 ? p_aob_group1[i_assignment] :
790 p_aob_group2[i_assignment];
791 g[i].i_channels = i == 0 ? i_channels1 :
794 g[i].b_used = i == 0 || b_group2_used;
797 for( unsigned j = 0; j < g[i].i_channels; j++ )
799 g[i].pi_position[j] = 0;
800 for( int k = 0; pi_vlc_chan_order_wg4[k] != 0; k++ )
802 const unsigned i_channel = pi_vlc_chan_order_wg4[k];
803 if( i_channel == p_aob[j] )
805 if( (*pi_layout) & i_channel )
806 g[i].pi_position[j]++;
813 static int BdHeader( unsigned *pi_rate,
814 unsigned *pi_channels, unsigned *pi_original_channels,
816 const uint8_t *p_header )
818 const uint32_t h = GetDWBE( p_header );
819 switch( ( h & 0xf000) >> 12 )
823 *pi_original_channels = AOUT_CHAN_CENTER;
827 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
831 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
835 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
839 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
840 AOUT_CHAN_REARCENTER;
844 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
845 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
849 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
850 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
854 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
855 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
860 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
861 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
862 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT;
866 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
867 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
868 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
875 switch( (h >> 6) & 0x03 )
880 case 2: /* 20 bits but samples are stored on 24 bits */
881 case 3: /* 24 bits */
887 switch( (h >> 8) & 0x0f )
904 static void VobExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
907 uint8_t *p_out = p_aout_buffer->p_buffer;
909 /* 20/24 bits LPCM use special packing */
912 while( p_block->i_buffer / 12 )
915 p_out[0] = p_block->p_buffer[0];
916 p_out[1] = p_block->p_buffer[1];
917 p_out[2] = p_block->p_buffer[8];
919 p_out[3] = p_block->p_buffer[2];
920 p_out[4] = p_block->p_buffer[3];
921 p_out[5] = p_block->p_buffer[9];
923 p_out[6] = p_block->p_buffer[4];
924 p_out[7] = p_block->p_buffer[5];
925 p_out[8] = p_block->p_buffer[10];
927 p_out[9] = p_block->p_buffer[6];
928 p_out[10] = p_block->p_buffer[7];
929 p_out[11] = p_block->p_buffer[11];
931 p_block->i_buffer -= 12;
932 p_block->p_buffer += 12;
936 else if( i_bits == 20 )
938 while( p_block->i_buffer / 10 )
941 p_out[0] = p_block->p_buffer[0];
942 p_out[1] = p_block->p_buffer[1];
943 p_out[2] = p_block->p_buffer[8] & 0xF0;
945 p_out[3] = p_block->p_buffer[2];
946 p_out[4] = p_block->p_buffer[3];
947 p_out[5] = p_block->p_buffer[8] << 4;
949 p_out[6] = p_block->p_buffer[4];
950 p_out[7] = p_block->p_buffer[5];
951 p_out[8] = p_block->p_buffer[9] & 0xF0;
953 p_out[9] = p_block->p_buffer[6];
954 p_out[10] = p_block->p_buffer[7];
955 p_out[11] = p_block->p_buffer[9] << 4;
957 p_block->i_buffer -= 10;
958 p_block->p_buffer += 10;
964 assert( i_bits == 16 );
965 memcpy( p_out, p_block->p_buffer, p_block->i_buffer );
968 static void AobExtract( aout_buffer_t *p_aout_buffer,
969 block_t *p_block, unsigned i_bits, aob_group_t p_group[2] )
971 const unsigned i_channels = p_group[0].i_channels +
972 ( p_group[1].b_used ? p_group[1].i_channels : 0 );
973 uint8_t *p_out = p_aout_buffer->p_buffer;
975 while( p_block->i_buffer > 0 )
977 for( int i = 0; i < 2; i++ )
979 const aob_group_t *g = &p_group[1-i];
980 const unsigned int i_group_size = 2 * g->i_channels * i_bits / 8;
982 if( p_block->i_buffer < i_group_size )
984 p_block->i_buffer = 0;
987 for( unsigned n = 0; n < 2; n++ )
989 for( unsigned j = 0; j < g->i_channels && g->b_used; j++ )
991 const int i_src = n * g->i_channels + j;
992 const int i_dst = n * i_channels + g->pi_position[j];
996 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
997 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
998 p_out[3*i_dst+2] = p_block->p_buffer[4*g->i_channels+i_src];
1000 else if( i_bits == 20 )
1002 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
1003 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
1005 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] ) & 0xf0;
1007 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] << 4) & 0xf0;
1011 assert( i_bits == 16 );
1012 p_out[2*i_dst+0] = p_block->p_buffer[2*i_src+0];
1013 p_out[2*i_dst+1] = p_block->p_buffer[2*i_src+1];
1018 p_block->i_buffer -= i_group_size;
1019 p_block->p_buffer += i_group_size;
1022 p_out += (i_bits == 16 ? 2 : 3) * i_channels * 2;
1026 static void BdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block )
1028 memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );