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 block_t *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,
184 unsigned *pi_channels_padding,
185 unsigned *pi_original_channels,
187 const uint8_t *p_header );
188 static void BdExtract( aout_buffer_t *, block_t *, unsigned, unsigned, unsigned, unsigned );
191 /*****************************************************************************
193 *****************************************************************************/
194 static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
196 decoder_t *p_dec = (decoder_t*)p_this;
197 decoder_sys_t *p_sys;
201 switch( p_dec->fmt_in.i_codec )
204 case VLC_CODEC_DVD_LPCM:
206 i_header_size = LPCM_VOB_HEADER_LEN;
209 case VLC_CODEC_DVDA_LPCM:
211 i_header_size = LPCM_AOB_HEADER_LEN;
214 case VLC_CODEC_BD_LPCM:
216 i_header_size = LPCM_BD_HEADER_LEN;
222 /* Allocate the memory needed to store the decoder's structure */
223 if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
227 p_sys->b_packetizer = b_packetizer;
228 date_Set( &p_sys->end_date, 0 );
229 p_sys->i_type = i_type;
230 p_sys->i_header_size = i_header_size;
232 /* Set output properties */
233 p_dec->fmt_out.i_cat = AUDIO_ES;
240 p_dec->fmt_out.i_codec = VLC_CODEC_DVD_LPCM;
243 p_dec->fmt_out.i_codec = VLC_CODEC_DVDA_LPCM;
248 p_dec->fmt_out.i_codec = VLC_CODEC_BD_LPCM;
254 switch( p_dec->fmt_out.audio.i_bitspersample )
258 p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
259 p_dec->fmt_out.audio.i_bitspersample = 24;
262 p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
263 p_dec->fmt_out.audio.i_bitspersample = 16;
269 p_dec->pf_decode_audio = DecodeFrame;
270 p_dec->pf_packetize = DecodeFrame;
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 block_t *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_channels_padding = 0;
323 unsigned i_padding = 0;
324 aob_group_t p_aob_group[2];
325 switch( p_sys->i_type )
328 i_ret = VobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
332 i_ret = AobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits, &i_padding,
337 i_ret = BdHeader( &i_rate, &i_channels, &i_channels_padding, &i_original_channels, &i_bits,
344 if( i_ret || p_block->i_buffer <= p_sys->i_header_size + i_padding )
346 msg_Warn( p_dec, "no frame sync or too small frame" );
347 block_Release( p_block );
351 /* Set output properties */
352 if( p_dec->fmt_out.audio.i_rate != i_rate )
354 date_Init( &p_sys->end_date, i_rate, 1 );
355 date_Set( &p_sys->end_date, p_block->i_pts );
357 p_dec->fmt_out.audio.i_rate = i_rate;
358 p_dec->fmt_out.audio.i_channels = i_channels;
359 p_dec->fmt_out.audio.i_original_channels = i_original_channels;
360 p_dec->fmt_out.audio.i_physical_channels = i_original_channels & AOUT_CHAN_PHYSMASK;
362 i_frame_length = (p_block->i_buffer - p_sys->i_header_size - i_padding) /
363 (i_channels + i_channels_padding) * 8 / i_bits;
365 if( p_sys->b_packetizer )
367 p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
369 date_Increment( &p_sys->end_date, i_frame_length ) -
372 /* Just pass on the incoming frame */
380 p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
381 p_dec->fmt_out.audio.i_bitspersample = 16;
385 p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
386 p_dec->fmt_out.audio.i_bitspersample = 24;
390 aout_buffer_t *p_aout_buffer;
391 p_aout_buffer = decoder_NewAudioBuffer( p_dec, i_frame_length );
395 p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
396 p_aout_buffer->i_length =
397 date_Increment( &p_sys->end_date, i_frame_length )
398 - p_aout_buffer->i_pts;
400 p_block->p_buffer += p_sys->i_header_size + i_padding;
401 p_block->i_buffer -= p_sys->i_header_size + i_padding;
403 switch( p_sys->i_type )
406 VobExtract( p_aout_buffer, p_block, i_bits );
409 AobExtract( p_aout_buffer, p_block, i_bits, p_aob_group );
414 BdExtract( p_aout_buffer, p_block, i_frame_length, i_channels, i_channels_padding, i_bits );
418 block_Release( p_block );
419 return p_aout_buffer;
423 /*****************************************************************************
424 * CloseCommon : lpcm decoder destruction
425 *****************************************************************************/
426 static void CloseCommon( vlc_object_t *p_this )
428 decoder_t *p_dec = (decoder_t*)p_this;
429 free( p_dec->p_sys );
433 /*****************************************************************************
434 * OpenEncoder: lpcm encoder construction
435 *****************************************************************************/
436 static int OpenEncoder( vlc_object_t *p_this )
438 encoder_t *p_enc = (encoder_t *)p_this;
439 encoder_sys_t *p_sys;
441 /* We only support DVD LPCM yet. */
442 if( p_enc->fmt_out.i_codec != VLC_CODEC_DVD_LPCM )
445 if( p_enc->fmt_in.audio.i_rate != 48000 &&
446 p_enc->fmt_in.audio.i_rate != 96000 &&
447 p_enc->fmt_in.audio.i_rate != 44100 &&
448 p_enc->fmt_in.audio.i_rate != 32000 )
450 msg_Err( p_enc, "DVD LPCM supports only sample rates of 48, 96, 44.1 or 32 kHz" );
454 if( p_enc->fmt_in.audio.i_channels > 8 )
456 msg_Err( p_enc, "DVD LPCM supports a maximum of eight channels" );
460 /* Allocate the memory needed to store the encoder's structure */
461 if( ( p_enc->p_sys = p_sys =
462 (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
465 /* In DVD LCPM, a frame is always 150 PTS ticks. */
466 p_sys->i_frame_samples = p_enc->fmt_in.audio.i_rate * 150 / 90000;
467 p_sys->p_buffer = (uint8_t *)malloc(
468 p_sys->i_frame_samples *
469 p_enc->fmt_in.audio.i_channels *
470 p_enc->fmt_in.audio.i_bitspersample);
471 p_sys->i_buffer_used = 0;
472 p_sys->i_frame_num = 0;
474 p_sys->i_channels = p_enc->fmt_in.audio.i_channels;
475 p_sys->i_rate = p_enc->fmt_in.audio.i_rate;
477 p_enc->pf_encode_audio = EncodeFrames;
478 p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
480 p_enc->fmt_in.audio.i_bitspersample = 16;
481 p_enc->fmt_in.i_codec = VLC_CODEC_S16B;
483 p_enc->fmt_out.i_bitrate =
484 p_enc->fmt_in.audio.i_channels *
485 p_enc->fmt_in.audio.i_rate *
486 p_enc->fmt_in.audio.i_bitspersample *
487 (p_sys->i_frame_samples + LPCM_VOB_HEADER_LEN) /
488 p_sys->i_frame_samples;
493 /*****************************************************************************
494 * CloseEncoder: lpcm encoder destruction
495 *****************************************************************************/
496 static void CloseEncoder ( vlc_object_t *p_this )
498 encoder_t *p_enc = (encoder_t *)p_this;
499 encoder_sys_t *p_sys = p_enc->p_sys;
501 free( p_sys->p_buffer );
505 /*****************************************************************************
506 * EncodeFrames: encode zero or more LCPM audio packets
507 *****************************************************************************/
508 static block_t *EncodeFrames( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
510 encoder_sys_t *p_sys = p_enc->p_sys;
511 block_t *p_first_block = NULL, *p_last_block = NULL;
513 if( !p_aout_buf || !p_aout_buf->i_buffer ) return NULL;
515 const int i_num_frames = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) /
516 p_sys->i_frame_samples;
517 const int i_leftover_samples = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) %
518 p_sys->i_frame_samples;
519 const int i_frame_size = p_sys->i_frame_samples * p_sys->i_channels * 2 + LPCM_VOB_HEADER_LEN;
520 const int i_start_offset = -p_sys->i_buffer_used;
522 uint8_t i_freq_code = 0;
524 switch( p_sys->i_rate ) {
541 int i_bytes_consumed = 0;
543 for ( int i = 0; i < i_num_frames; ++i )
545 block_t *p_block = block_New( p_enc, i_frame_size );
549 uint8_t *frame = (uint8_t *)p_block->p_buffer;
550 frame[0] = 1; /* one frame in packet */
552 frame[2] = 0; /* no first access unit */
553 frame[3] = (p_sys->i_frame_num + i) & 0x1f; /* no emphasis, no mute */
554 frame[4] = (i_freq_code << 4) | (p_sys->i_channels - 1);
555 frame[5] = 0x80; /* neutral dynamic range */
557 const int i_consume_samples = p_sys->i_frame_samples - p_sys->i_buffer_used;
558 const int i_kept_bytes = p_sys->i_buffer_used * p_sys->i_channels * 2;
559 const int i_consume_bytes = i_consume_samples * p_sys->i_channels * 2;
561 memcpy( frame + 6, p_sys->p_buffer, i_kept_bytes );
562 memcpy( frame + 6 + i_kept_bytes, p_aout_buf->p_buffer + i_bytes_consumed, i_consume_bytes );
564 p_sys->i_frame_num++;
565 p_sys->i_buffer_used = 0;
566 i_bytes_consumed += i_consume_bytes;
568 /* We need to find i_length by means of next_pts due to possible roundoff errors. */
569 mtime_t this_pts = p_aout_buf->i_pts +
570 (i * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
571 mtime_t next_pts = p_aout_buf->i_pts +
572 ((i + 1) * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
574 p_block->i_pts = p_block->i_dts = this_pts;
575 p_block->i_length = next_pts - this_pts;
578 p_first_block = p_last_block = p_block;
580 p_last_block = p_last_block->p_next = p_block;
583 memcpy( p_sys->p_buffer,
584 p_aout_buf->p_buffer + i_bytes_consumed,
585 i_leftover_samples * p_sys->i_channels * 2 );
586 p_sys->i_buffer_used = i_leftover_samples;
588 return p_first_block;
592 /*****************************************************************************
594 *****************************************************************************/
595 static int VobHeader( unsigned *pi_rate,
596 unsigned *pi_channels, unsigned *pi_original_channels,
598 const uint8_t *p_header )
600 const uint8_t i_header = p_header[4];
602 switch( (i_header >> 4) & 0x3 )
618 *pi_channels = (i_header & 0x7) + 1;
619 switch( *pi_channels - 1 )
622 *pi_original_channels = AOUT_CHAN_CENTER;
625 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
628 /* This is unsure. */
629 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
632 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
633 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
636 /* This is unsure. */
637 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
638 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
642 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
643 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
644 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
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;
653 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
654 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
655 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
656 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
660 switch( (i_header >> 6) & 0x3 )
674 /* Check frame sync and drop it. */
675 if( p_header[5] != 0x80 )
680 static const unsigned p_aob_group1[21][6] = {
681 { AOUT_CHAN_CENTER, 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, 0 },
693 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 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_CENTER, 0 },
698 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
699 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
700 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
701 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
703 static const unsigned p_aob_group2[21][6] = {
706 { AOUT_CHAN_REARCENTER, 0 },
707 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
708 { AOUT_CHAN_LFE, 0 },
709 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
710 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
711 { AOUT_CHAN_CENTER, 0 },
712 { AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, 0 },
713 { AOUT_CHAN_CENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
714 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
715 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
716 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
717 { AOUT_CHAN_REARCENTER, 0 },
718 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
719 { AOUT_CHAN_LFE, 0 },
720 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
721 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
722 { AOUT_CHAN_LFE, 0 },
723 { AOUT_CHAN_CENTER, 0 },
724 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
727 static int AobHeader( unsigned *pi_rate,
728 unsigned *pi_channels, unsigned *pi_layout,
730 unsigned *pi_padding,
732 const uint8_t *p_header )
734 const unsigned i_header_size = GetWBE( &p_header[1] );
735 if( i_header_size + 3 < LPCM_AOB_HEADER_LEN )
738 *pi_padding = 3+i_header_size - LPCM_AOB_HEADER_LEN;
740 const int i_index_size_g1 = (p_header[6] >> 4) & 0x0f;
741 const int i_index_size_g2 = (p_header[6] ) & 0x0f;
742 const int i_index_rate_g1 = (p_header[7] >> 4) & 0x0f;
743 const int i_index_rate_g2 = (p_header[7] ) & 0x0f;
744 const int i_assignment = p_header[9];
747 if( i_index_size_g1 > 0x02 ||
748 ( i_index_size_g2 != 0x0f && i_index_size_g2 > 0x02 ) )
750 if( (i_index_rate_g1 & 0x07) > 0x02 ||
751 ( i_index_rate_g2 != 0x0f && (i_index_rate_g1 & 0x07) > 0x02 ) )
753 if( i_assignment > 20 )
757 *pi_bits = 16 + 4 * i_index_size_g1;
758 if( i_index_rate_g1 & 0x08 )
759 *pi_rate = 44100 << (i_index_rate_g1 & 0x07);
761 *pi_rate = 48000 << (i_index_rate_g1 & 0x07);
765 unsigned i_channels1 = 0;
766 unsigned i_layout1 = 0;
767 for( int i = 0; p_aob_group1[i_assignment][i] != 0; i++ )
770 i_layout1 |= p_aob_group1[i_assignment][i];
773 unsigned i_channels2 = 0;
774 unsigned i_layout2 = 0;
775 if( i_index_size_g2 != 0x0f && i_index_rate_g2 != 0x0f )
777 for( int i = 0; p_aob_group2[i_assignment][i] != 0; i++ )
780 i_layout2 |= p_aob_group2[i_assignment][i];
782 assert( (i_layout1 & i_layout2) == 0 );
784 /* It is enabled only when presents and compatible wih group1 */
785 const bool b_group2_used = i_index_size_g1 == i_index_size_g2 &&
786 i_index_rate_g1 == i_index_rate_g2;
789 *pi_channels = i_channels1 + ( b_group2_used ? i_channels2 : 0 );
790 *pi_layout = i_layout1 | ( b_group2_used ? i_layout2 : 0 );
793 for( unsigned i = 0; i < 2; i++ )
795 const unsigned *p_aob = i == 0 ? p_aob_group1[i_assignment] :
796 p_aob_group2[i_assignment];
797 g[i].i_channels = i == 0 ? i_channels1 :
800 g[i].b_used = i == 0 || b_group2_used;
803 for( unsigned j = 0; j < g[i].i_channels; j++ )
805 g[i].pi_position[j] = 0;
806 for( int k = 0; pi_vlc_chan_order_wg4[k] != 0; k++ )
808 const unsigned i_channel = pi_vlc_chan_order_wg4[k];
809 if( i_channel == p_aob[j] )
811 if( (*pi_layout) & i_channel )
812 g[i].pi_position[j]++;
819 static int BdHeader( unsigned *pi_rate,
820 unsigned *pi_channels,
821 unsigned *pi_channels_padding,
822 unsigned *pi_original_channels,
824 const uint8_t *p_header )
826 const uint32_t h = GetDWBE( p_header );
827 switch( ( h & 0xf000) >> 12 )
831 *pi_original_channels = AOUT_CHAN_CENTER;
835 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
839 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
843 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
847 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
848 AOUT_CHAN_REARCENTER;
852 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
853 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
857 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
858 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
862 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
863 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
868 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
869 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
870 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT;
874 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
875 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
876 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
883 *pi_channels_padding = *pi_channels & 1;
885 switch( (h >> 6) & 0x03 )
890 case 2: /* 20 bits but samples are stored on 24 bits */
891 case 3: /* 24 bits */
897 switch( (h >> 8) & 0x0f )
914 static void VobExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
917 uint8_t *p_out = p_aout_buffer->p_buffer;
919 /* 20/24 bits LPCM use special packing */
922 while( p_block->i_buffer / 12 )
925 p_out[0] = p_block->p_buffer[0];
926 p_out[1] = p_block->p_buffer[1];
927 p_out[2] = p_block->p_buffer[8];
929 p_out[3] = p_block->p_buffer[2];
930 p_out[4] = p_block->p_buffer[3];
931 p_out[5] = p_block->p_buffer[9];
933 p_out[6] = p_block->p_buffer[4];
934 p_out[7] = p_block->p_buffer[5];
935 p_out[8] = p_block->p_buffer[10];
937 p_out[9] = p_block->p_buffer[6];
938 p_out[10] = p_block->p_buffer[7];
939 p_out[11] = p_block->p_buffer[11];
941 p_block->i_buffer -= 12;
942 p_block->p_buffer += 12;
946 else if( i_bits == 20 )
948 while( p_block->i_buffer / 10 )
951 p_out[0] = p_block->p_buffer[0];
952 p_out[1] = p_block->p_buffer[1];
953 p_out[2] = p_block->p_buffer[8] & 0xF0;
955 p_out[3] = p_block->p_buffer[2];
956 p_out[4] = p_block->p_buffer[3];
957 p_out[5] = p_block->p_buffer[8] << 4;
959 p_out[6] = p_block->p_buffer[4];
960 p_out[7] = p_block->p_buffer[5];
961 p_out[8] = p_block->p_buffer[9] & 0xF0;
963 p_out[9] = p_block->p_buffer[6];
964 p_out[10] = p_block->p_buffer[7];
965 p_out[11] = p_block->p_buffer[9] << 4;
967 p_block->i_buffer -= 10;
968 p_block->p_buffer += 10;
974 assert( i_bits == 16 );
975 memcpy( p_out, p_block->p_buffer, p_block->i_buffer );
978 static void AobExtract( aout_buffer_t *p_aout_buffer,
979 block_t *p_block, unsigned i_bits, aob_group_t p_group[2] )
981 const unsigned i_channels = p_group[0].i_channels +
982 ( p_group[1].b_used ? p_group[1].i_channels : 0 );
983 uint8_t *p_out = p_aout_buffer->p_buffer;
985 while( p_block->i_buffer > 0 )
987 for( int i = 0; i < 2; i++ )
989 const aob_group_t *g = &p_group[1-i];
990 const unsigned int i_group_size = 2 * g->i_channels * i_bits / 8;
992 if( p_block->i_buffer < i_group_size )
994 p_block->i_buffer = 0;
997 for( unsigned n = 0; n < 2; n++ )
999 for( unsigned j = 0; j < g->i_channels && g->b_used; j++ )
1001 const int i_src = n * g->i_channels + j;
1002 const int i_dst = n * i_channels + g->pi_position[j];
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];
1008 p_out[3*i_dst+2] = p_block->p_buffer[4*g->i_channels+i_src];
1010 else if( i_bits == 20 )
1012 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
1013 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
1015 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] ) & 0xf0;
1017 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] << 4) & 0xf0;
1021 assert( i_bits == 16 );
1022 p_out[2*i_dst+0] = p_block->p_buffer[2*i_src+0];
1023 p_out[2*i_dst+1] = p_block->p_buffer[2*i_src+1];
1028 p_block->i_buffer -= i_group_size;
1029 p_block->p_buffer += i_group_size;
1032 p_out += (i_bits == 16 ? 2 : 3) * i_channels * 2;
1036 static void BdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
1037 unsigned i_frame_length,
1038 unsigned i_channels, unsigned i_channels_padding,
1041 if( i_channels_padding > 0 )
1043 uint8_t *p_src = p_block->p_buffer;
1044 uint8_t *p_dst = p_aout_buffer->p_buffer;
1045 while( i_frame_length > 0 )
1047 memcpy( p_dst, p_src, i_channels * i_bits / 8 );
1048 p_src += (i_channels + i_channels_padding) * i_bits / 8;
1049 p_dst += (i_channels + 0) * i_bits / 8;
1055 memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );