1 /*****************************************************************************
2 * lpcm.c: lpcm decoder/packetizer module
3 *****************************************************************************
4 * Copyright (C) 1999-2008 VLC authors and VideoLAN
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 it
15 * under the terms of the GNU Lesser General Public License as published by
16 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
24 * You should have received a copy of the GNU Lesser General Public License
25 * along with this program; if not, write to the Free Software Foundation,
26 * 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>
43 /*****************************************************************************
45 *****************************************************************************/
46 static int OpenDecoder ( vlc_object_t * );
47 static int OpenPacketizer( vlc_object_t * );
48 static void CloseCommon ( vlc_object_t * );
51 static int OpenEncoder ( vlc_object_t * );
52 static void CloseEncoder ( vlc_object_t * );
53 static block_t *EncodeFrames( encoder_t *, block_t * );
58 set_category( CAT_INPUT )
59 set_subcategory( SUBCAT_INPUT_ACODEC )
60 set_description( N_("Linear PCM audio decoder") )
61 set_capability( "decoder", 100 )
62 set_callbacks( OpenDecoder, CloseCommon )
65 set_description( N_("Linear PCM audio packetizer") )
66 set_capability( "packetizer", 100 )
67 set_callbacks( OpenPacketizer, CloseCommon )
71 set_description( N_("Linear PCM audio encoder") )
72 set_capability( "encoder", 100 )
73 set_callbacks( OpenEncoder, CloseEncoder )
74 add_shortcut( "lpcm" )
80 /*****************************************************************************
81 * decoder_sys_t : lpcm decoder descriptor
82 *****************************************************************************/
94 unsigned i_header_size;
96 uint8_t i_chans_to_reorder;
97 uint8_t pi_chan_table[AOUT_CHAN_MAX];
115 * - number of frames in this packet (8 bits)
116 * - first access unit (16 bits) == 0x0003 ?
120 * - current frame (5 bits)
121 * - quantisation (2 bits) 0 == 16bps, 1 == 20bps, 2 == 24bps, 3 == illegal
122 * - frequency (2 bits) 0 == 48 kHz, 1 == 96 kHz, 2 == 44.1 kHz, 3 == 32 kHz
124 * - number of channels - 1 (3 bits) 1 == 2 channels
125 * - dynamic range (8 bits) 0x80 == neutral
127 * LPCM DVD-A header (http://dvd-audio.sourceforge.net/spec/aob.shtml)
128 * - continuity counter (8 bits, clipped to 0x00-0x1f)
129 * - header size (16 bits)
130 * - byte pointer to start of first audio frame.
131 * - unknown (8bits, 0x10 for stereo, 0x00 for surround)
132 * - sample size (4+4 bits)
133 * - samplerate (4+4 bits)
135 * - group assignment (8 bits)
137 * - padding(variable)
140 * - unknown (16 bits)
141 * - number of channels (4 bits)
142 * - frequency (4 bits)
143 * - bits per sample (2 bits)
147 #define LPCM_VOB_HEADER_LEN (6)
148 #define LPCM_AOB_HEADER_LEN (11)
149 #define LPCM_BD_HEADER_LEN (4)
162 unsigned pi_position[6];
165 /*****************************************************************************
167 *****************************************************************************/
168 static block_t *DecodeFrame ( decoder_t *, block_t ** );
171 static int VobHeader( unsigned *pi_rate,
172 unsigned *pi_channels, unsigned *pi_original_channels,
174 const uint8_t *p_header );
175 static void VobExtract( block_t *, block_t *, unsigned i_bits );
177 static int AobHeader( unsigned *pi_rate,
178 unsigned *pi_channels, unsigned *pi_layout,
180 unsigned *pi_padding,
182 const uint8_t *p_header );
183 static void AobExtract( block_t *, block_t *, unsigned i_bits, aob_group_t p_group[2] );
185 static int BdHeader( decoder_sys_t *p_sys,
187 unsigned *pi_channels,
188 unsigned *pi_channels_padding,
189 unsigned *pi_original_channels,
191 const uint8_t *p_header );
192 static void BdExtract( block_t *, block_t *, unsigned, unsigned, unsigned, unsigned );
195 /*****************************************************************************
197 *****************************************************************************/
198 static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
200 decoder_t *p_dec = (decoder_t*)p_this;
201 decoder_sys_t *p_sys;
205 switch( p_dec->fmt_in.i_codec )
208 case VLC_CODEC_DVD_LPCM:
210 i_header_size = LPCM_VOB_HEADER_LEN;
213 case VLC_CODEC_DVDA_LPCM:
215 i_header_size = LPCM_AOB_HEADER_LEN;
218 case VLC_CODEC_BD_LPCM:
220 i_header_size = LPCM_BD_HEADER_LEN;
226 /* Allocate the memory needed to store the decoder's structure */
227 if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
231 p_sys->b_packetizer = b_packetizer;
232 date_Set( &p_sys->end_date, 0 );
233 p_sys->i_type = i_type;
234 p_sys->i_header_size = i_header_size;
235 p_sys->i_chans_to_reorder = 0;
237 /* Set output properties */
238 p_dec->fmt_out.i_cat = AUDIO_ES;
245 p_dec->fmt_out.i_codec = VLC_CODEC_DVD_LPCM;
248 p_dec->fmt_out.i_codec = VLC_CODEC_DVDA_LPCM;
253 p_dec->fmt_out.i_codec = VLC_CODEC_BD_LPCM;
259 switch( p_dec->fmt_out.audio.i_bitspersample )
263 p_dec->fmt_out.i_codec = VLC_CODEC_S32N;
264 p_dec->fmt_out.audio.i_bitspersample = 32;
267 p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
268 p_dec->fmt_out.audio.i_bitspersample = 16;
274 p_dec->pf_decode_audio = DecodeFrame;
275 p_dec->pf_packetize = DecodeFrame;
279 static int OpenDecoder( vlc_object_t *p_this )
281 return OpenCommon( p_this, false );
283 static int OpenPacketizer( vlc_object_t *p_this )
285 return OpenCommon( p_this, true );
288 /*****************************************************************************
289 * DecodeFrame: decodes an lpcm frame.
290 ****************************************************************************
291 * Beware, this function must be fed with complete frames (PES packet).
292 *****************************************************************************/
293 static block_t *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
295 decoder_sys_t *p_sys = p_dec->p_sys;
297 unsigned int i_rate = 0, i_original_channels = 0, i_channels = 0, i_bits = 0;
300 if( !pp_block || !*pp_block ) return NULL;
303 *pp_block = NULL; /* So the packet doesn't get re-sent */
305 /* Date management */
306 if( p_block->i_pts > VLC_TS_INVALID &&
307 p_block->i_pts != date_Get( &p_sys->end_date ) )
309 date_Set( &p_sys->end_date, p_block->i_pts );
312 if( !date_Get( &p_sys->end_date ) )
314 /* We've just started the stream, wait for the first PTS. */
315 block_Release( p_block );
319 if( p_block->i_buffer <= p_sys->i_header_size )
321 msg_Err(p_dec, "frame is too short");
322 block_Release( p_block );
327 unsigned i_channels_padding = 0;
328 unsigned i_padding = 0;
329 aob_group_t p_aob_group[2];
330 switch( p_sys->i_type )
333 i_ret = VobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
337 i_ret = AobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits, &i_padding,
342 i_ret = BdHeader( p_sys, &i_rate, &i_channels, &i_channels_padding, &i_original_channels, &i_bits,
349 if( i_ret || p_block->i_buffer <= p_sys->i_header_size + i_padding )
351 msg_Warn( p_dec, "no frame sync or too small frame" );
352 block_Release( p_block );
356 /* Set output properties */
357 if( p_dec->fmt_out.audio.i_rate != i_rate )
359 date_Init( &p_sys->end_date, i_rate, 1 );
360 date_Set( &p_sys->end_date, p_block->i_pts );
362 p_dec->fmt_out.audio.i_rate = i_rate;
363 p_dec->fmt_out.audio.i_channels = i_channels;
364 p_dec->fmt_out.audio.i_original_channels = i_original_channels;
365 p_dec->fmt_out.audio.i_physical_channels = i_original_channels;
367 i_frame_length = (p_block->i_buffer - p_sys->i_header_size - i_padding) /
368 (i_channels + i_channels_padding) * 8 / i_bits;
370 if( p_sys->b_packetizer )
372 p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
374 date_Increment( &p_sys->end_date, i_frame_length ) -
377 /* Just pass on the incoming frame */
385 p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
386 p_dec->fmt_out.audio.i_bitspersample = 16;
390 p_dec->fmt_out.i_codec = VLC_CODEC_S32N;
391 p_dec->fmt_out.audio.i_bitspersample = 32;
395 block_t *p_aout_buffer;
396 p_aout_buffer = decoder_NewAudioBuffer( p_dec, i_frame_length );
400 p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
401 p_aout_buffer->i_length =
402 date_Increment( &p_sys->end_date, i_frame_length )
403 - p_aout_buffer->i_pts;
405 p_block->p_buffer += p_sys->i_header_size + i_padding;
406 p_block->i_buffer -= p_sys->i_header_size + i_padding;
408 if( p_sys->i_chans_to_reorder )
410 aout_ChannelReorder( p_block->p_buffer, p_block->i_buffer,
411 p_sys->i_chans_to_reorder, p_sys->pi_chan_table,
412 p_dec->fmt_out.i_codec );
415 switch( p_sys->i_type )
418 VobExtract( p_aout_buffer, p_block, i_bits );
421 AobExtract( p_aout_buffer, p_block, i_bits, p_aob_group );
426 BdExtract( p_aout_buffer, p_block, i_frame_length, i_channels, i_channels_padding, i_bits );
430 block_Release( p_block );
431 return p_aout_buffer;
435 /*****************************************************************************
436 * CloseCommon : lpcm decoder destruction
437 *****************************************************************************/
438 static void CloseCommon( vlc_object_t *p_this )
440 decoder_t *p_dec = (decoder_t*)p_this;
441 free( p_dec->p_sys );
445 /*****************************************************************************
446 * OpenEncoder: lpcm encoder construction
447 *****************************************************************************/
448 static int OpenEncoder( vlc_object_t *p_this )
450 encoder_t *p_enc = (encoder_t *)p_this;
451 encoder_sys_t *p_sys;
453 /* We only support DVD LPCM yet. */
454 if( p_enc->fmt_out.i_codec != VLC_CODEC_DVD_LPCM )
457 if( p_enc->fmt_in.audio.i_rate != 48000 &&
458 p_enc->fmt_in.audio.i_rate != 96000 &&
459 p_enc->fmt_in.audio.i_rate != 44100 &&
460 p_enc->fmt_in.audio.i_rate != 32000 )
462 msg_Err( p_enc, "DVD LPCM supports only sample rates of 48, 96, 44.1 or 32 kHz" );
466 if( p_enc->fmt_in.audio.i_channels > 8 )
468 msg_Err( p_enc, "DVD LPCM supports a maximum of eight channels" );
472 /* Allocate the memory needed to store the encoder's structure */
473 if( ( p_enc->p_sys = p_sys =
474 (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
477 /* In DVD LCPM, a frame is always 150 PTS ticks. */
478 p_sys->i_frame_samples = p_enc->fmt_in.audio.i_rate * 150 / 90000;
479 p_sys->p_buffer = xmalloc(p_sys->i_frame_samples
480 * p_enc->fmt_in.audio.i_channels * 16);
481 p_sys->i_buffer_used = 0;
482 p_sys->i_frame_num = 0;
484 p_sys->i_channels = p_enc->fmt_in.audio.i_channels;
485 p_sys->i_rate = p_enc->fmt_in.audio.i_rate;
487 p_enc->pf_encode_audio = EncodeFrames;
488 p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
490 p_enc->fmt_in.audio.i_bitspersample = 16;
491 p_enc->fmt_in.i_codec = VLC_CODEC_S16N;
493 p_enc->fmt_out.i_bitrate =
494 p_enc->fmt_in.audio.i_channels *
495 p_enc->fmt_in.audio.i_rate *
496 p_enc->fmt_in.audio.i_bitspersample *
497 (p_sys->i_frame_samples + LPCM_VOB_HEADER_LEN) /
498 p_sys->i_frame_samples;
503 /*****************************************************************************
504 * CloseEncoder: lpcm encoder destruction
505 *****************************************************************************/
506 static void CloseEncoder ( vlc_object_t *p_this )
508 encoder_t *p_enc = (encoder_t *)p_this;
509 encoder_sys_t *p_sys = p_enc->p_sys;
511 free( p_sys->p_buffer );
515 /*****************************************************************************
516 * EncodeFrames: encode zero or more LCPM audio packets
517 *****************************************************************************/
518 static block_t *EncodeFrames( encoder_t *p_enc, block_t *p_aout_buf )
520 encoder_sys_t *p_sys = p_enc->p_sys;
521 block_t *p_first_block = NULL, *p_last_block = NULL;
523 if( !p_aout_buf || !p_aout_buf->i_buffer ) return NULL;
525 const int i_num_frames = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) /
526 p_sys->i_frame_samples;
527 const int i_leftover_samples = ( p_sys->i_buffer_used + p_aout_buf->i_nb_samples ) %
528 p_sys->i_frame_samples;
529 const int i_frame_size = p_sys->i_frame_samples * p_sys->i_channels * 2 + LPCM_VOB_HEADER_LEN;
530 const int i_start_offset = -p_sys->i_buffer_used;
532 uint8_t i_freq_code = 0;
534 switch( p_sys->i_rate ) {
551 int i_bytes_consumed = 0;
553 for ( int i = 0; i < i_num_frames; ++i )
555 block_t *p_block = block_Alloc( i_frame_size );
559 uint8_t *frame = (uint8_t *)p_block->p_buffer;
560 frame[0] = 1; /* one frame in packet */
562 frame[2] = 0; /* no first access unit */
563 frame[3] = (p_sys->i_frame_num + i) & 0x1f; /* no emphasis, no mute */
564 frame[4] = (i_freq_code << 4) | (p_sys->i_channels - 1);
565 frame[5] = 0x80; /* neutral dynamic range */
567 const int i_consume_samples = p_sys->i_frame_samples - p_sys->i_buffer_used;
568 const int i_kept_bytes = p_sys->i_buffer_used * p_sys->i_channels * 2;
569 const int i_consume_bytes = i_consume_samples * p_sys->i_channels * 2;
571 #ifdef WORDS_BIGENDIAN
572 memcpy( frame + 6, p_sys->p_buffer, i_kept_bytes );
573 memcpy( frame + 6 + i_kept_bytes, p_aout_buf->p_buffer + i_bytes_consumed,
576 swab( p_sys->p_buffer, frame + 6, i_kept_bytes );
577 swab( p_aout_buf->p_buffer + i_bytes_consumed, frame + 6 + i_kept_bytes,
581 p_sys->i_frame_num++;
582 p_sys->i_buffer_used = 0;
583 i_bytes_consumed += i_consume_bytes;
585 /* We need to find i_length by means of next_pts due to possible roundoff errors. */
586 mtime_t this_pts = p_aout_buf->i_pts +
587 (i * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
588 mtime_t next_pts = p_aout_buf->i_pts +
589 ((i + 1) * p_sys->i_frame_samples + i_start_offset) * CLOCK_FREQ / p_sys->i_rate;
591 p_block->i_pts = p_block->i_dts = this_pts;
592 p_block->i_length = next_pts - this_pts;
595 p_first_block = p_last_block = p_block;
597 p_last_block = p_last_block->p_next = p_block;
600 memcpy( p_sys->p_buffer,
601 p_aout_buf->p_buffer + i_bytes_consumed,
602 i_leftover_samples * p_sys->i_channels * 2 );
603 p_sys->i_buffer_used = i_leftover_samples;
605 return p_first_block;
609 /*****************************************************************************
611 *****************************************************************************/
612 static int VobHeader( unsigned *pi_rate,
613 unsigned *pi_channels, unsigned *pi_original_channels,
615 const uint8_t *p_header )
617 const uint8_t i_header = p_header[4];
619 switch( (i_header >> 4) & 0x3 )
635 *pi_channels = (i_header & 0x7) + 1;
636 switch( *pi_channels - 1 )
639 *pi_original_channels = AOUT_CHAN_CENTER;
642 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
645 /* This is unsure. */
646 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
649 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
650 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
653 /* This is unsure. */
654 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
655 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
659 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
660 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
661 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
664 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
665 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
666 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
667 | AOUT_CHAN_MIDDLERIGHT;
670 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
671 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
672 | AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
673 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
677 switch( (i_header >> 6) & 0x3 )
691 /* Check frame sync and drop it. */
692 if( p_header[5] != 0x80 )
697 static const unsigned p_aob_group1[21][6] = {
698 { AOUT_CHAN_CENTER, 0 },
699 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
700 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
701 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
702 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
703 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
704 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
705 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
706 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
707 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
708 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
709 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
710 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
711 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
712 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
713 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
714 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
715 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
716 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
717 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
718 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
720 static const unsigned p_aob_group2[21][6] = {
723 { AOUT_CHAN_REARCENTER, 0 },
724 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
725 { AOUT_CHAN_LFE, 0 },
726 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
727 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
728 { AOUT_CHAN_CENTER, 0 },
729 { AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, 0 },
730 { AOUT_CHAN_CENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
731 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
732 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
733 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
734 { AOUT_CHAN_REARCENTER, 0 },
735 { AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
736 { AOUT_CHAN_LFE, 0 },
737 { AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
738 { AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
739 { AOUT_CHAN_LFE, 0 },
740 { AOUT_CHAN_CENTER, 0 },
741 { AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
744 static int AobHeader( unsigned *pi_rate,
745 unsigned *pi_channels, unsigned *pi_layout,
747 unsigned *pi_padding,
749 const uint8_t *p_header )
751 const unsigned i_header_size = GetWBE( &p_header[1] );
752 if( i_header_size + 3 < LPCM_AOB_HEADER_LEN )
755 *pi_padding = 3+i_header_size - LPCM_AOB_HEADER_LEN;
757 const int i_index_size_g1 = (p_header[6] >> 4) & 0x0f;
758 const int i_index_size_g2 = (p_header[6] ) & 0x0f;
759 const int i_index_rate_g1 = (p_header[7] >> 4) & 0x0f;
760 const int i_index_rate_g2 = (p_header[7] ) & 0x0f;
761 const int i_assignment = p_header[9];
764 if( i_index_size_g1 > 0x02 ||
765 ( i_index_size_g2 != 0x0f && i_index_size_g2 > 0x02 ) )
767 if( (i_index_rate_g1 & 0x07) > 0x02 ||
768 ( i_index_rate_g2 != 0x0f && (i_index_rate_g1 & 0x07) > 0x02 ) )
770 if( i_assignment > 20 )
774 *pi_bits = 16 + 4 * i_index_size_g1;
775 if( i_index_rate_g1 & 0x08 )
776 *pi_rate = 44100 << (i_index_rate_g1 & 0x07);
778 *pi_rate = 48000 << (i_index_rate_g1 & 0x07);
782 unsigned i_channels1 = 0;
783 unsigned i_layout1 = 0;
784 for( int i = 0; p_aob_group1[i_assignment][i] != 0; i++ )
787 i_layout1 |= p_aob_group1[i_assignment][i];
790 unsigned i_channels2 = 0;
791 unsigned i_layout2 = 0;
792 if( i_index_size_g2 != 0x0f && i_index_rate_g2 != 0x0f )
794 for( int i = 0; p_aob_group2[i_assignment][i] != 0; i++ )
797 i_layout2 |= p_aob_group2[i_assignment][i];
799 assert( (i_layout1 & i_layout2) == 0 );
801 /* It is enabled only when presents and compatible wih group1 */
802 const bool b_group2_used = i_index_size_g1 == i_index_size_g2 &&
803 i_index_rate_g1 == i_index_rate_g2;
806 *pi_channels = i_channels1 + ( b_group2_used ? i_channels2 : 0 );
807 *pi_layout = i_layout1 | ( b_group2_used ? i_layout2 : 0 );
810 for( unsigned i = 0; i < 2; i++ )
812 const unsigned *p_aob = i == 0 ? p_aob_group1[i_assignment] :
813 p_aob_group2[i_assignment];
814 g[i].i_channels = i == 0 ? i_channels1 :
817 g[i].b_used = i == 0 || b_group2_used;
820 for( unsigned j = 0; j < g[i].i_channels; j++ )
822 g[i].pi_position[j] = 0;
823 for( int k = 0; pi_vlc_chan_order_wg4[k] != 0; k++ )
825 const unsigned i_channel = pi_vlc_chan_order_wg4[k];
826 if( i_channel == p_aob[j] )
828 if( (*pi_layout) & i_channel )
829 g[i].pi_position[j]++;
836 static const uint32_t pi_8channels_in[] =
837 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER,
838 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
839 AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_LFE, 0 };
841 static const uint32_t pi_7channels_in[] =
842 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER,
843 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
844 AOUT_CHAN_MIDDLERIGHT, 0 };
846 static const uint32_t pi_6channels_in[] =
847 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER,
848 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_LFE, 0 };
850 static const uint32_t pi_5channels_in[] =
851 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER,
852 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, 0 };
854 static const uint32_t pi_4channels_in[] =
855 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
856 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 };
858 static const uint32_t pi_3channels_in[] =
859 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
860 AOUT_CHAN_CENTER, 0 };
863 static int BdHeader( decoder_sys_t *p_sys,
865 unsigned *pi_channels,
866 unsigned *pi_channels_padding,
867 unsigned *pi_original_channels,
869 const uint8_t *p_header )
871 const uint32_t h = GetDWBE( p_header );
872 const uint32_t *pi_channels_in = NULL;
873 switch( ( h & 0xf000) >> 12 )
877 *pi_original_channels = AOUT_CHAN_CENTER;
881 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
885 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
886 pi_channels_in = pi_3channels_in;
890 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
894 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
895 AOUT_CHAN_REARCENTER;
899 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
900 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
901 pi_channels_in = pi_4channels_in;
905 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
906 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
907 pi_channels_in = pi_5channels_in;
911 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
912 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
914 pi_channels_in = pi_6channels_in;
918 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
919 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
920 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT;
921 pi_channels_in = pi_7channels_in;
925 *pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
926 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
927 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
929 pi_channels_in = pi_8channels_in;
935 *pi_channels_padding = *pi_channels & 1;
937 switch( (h >> 6) & 0x03 )
942 case 2: /* 20 bits but samples are stored on 24 bits */
943 case 3: /* 24 bits */
949 switch( (h >> 8) & 0x0f )
966 p_sys->i_chans_to_reorder =
967 aout_CheckChannelReorder( pi_channels_in, NULL,
968 *pi_original_channels,
969 p_sys->pi_chan_table );
975 static void VobExtract( block_t *p_aout_buffer, block_t *p_block,
978 /* 20/24 bits LPCM use special packing */
981 uint32_t *p_out = (uint32_t *)p_aout_buffer->p_buffer;
983 while( p_block->i_buffer / 12 )
986 *(p_out++) = (p_block->p_buffer[ 0] << 24)
987 | (p_block->p_buffer[ 1] << 16)
988 | (p_block->p_buffer[ 8] << 8);
990 *(p_out++) = (p_block->p_buffer[ 2] << 24)
991 | (p_block->p_buffer[ 3] << 16)
992 | (p_block->p_buffer[ 9] << 8);
994 *(p_out++) = (p_block->p_buffer[ 4] << 24)
995 | (p_block->p_buffer[ 5] << 16)
996 | (p_block->p_buffer[10] << 8);
998 *(p_out++) = (p_block->p_buffer[ 6] << 24)
999 | (p_block->p_buffer[ 7] << 16)
1000 | (p_block->p_buffer[11] << 8);
1002 p_block->i_buffer -= 12;
1003 p_block->p_buffer += 12;
1006 else if( i_bits == 20 )
1008 uint32_t *p_out = (uint32_t *)p_aout_buffer->p_buffer;
1010 while( p_block->i_buffer / 10 )
1013 *(p_out++) = ( p_block->p_buffer[0] << 24)
1014 | ( p_block->p_buffer[1] << 16)
1015 | ((p_block->p_buffer[8] & 0xF0) << 8);
1017 *(p_out++) = ( p_block->p_buffer[2] << 24)
1018 | ( p_block->p_buffer[3] << 16)
1019 | ((p_block->p_buffer[8] & 0x0F) << 12);
1021 *(p_out++) = ( p_block->p_buffer[4] << 24)
1022 | ( p_block->p_buffer[5] << 16)
1023 | ((p_block->p_buffer[9] & 0xF0) << 8);
1025 *(p_out++) = ( p_block->p_buffer[6] << 24)
1026 | ( p_block->p_buffer[7] << 16)
1027 | ((p_block->p_buffer[9] & 0x0F) << 12);
1029 p_block->i_buffer -= 10;
1030 p_block->p_buffer += 10;
1035 assert( i_bits == 16 );
1036 #ifdef WORDS_BIGENDIAN
1037 memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );
1039 swab( p_block->p_buffer, p_aout_buffer->p_buffer, p_block->i_buffer );
1043 static void AobExtract( block_t *p_aout_buffer,
1044 block_t *p_block, unsigned i_bits, aob_group_t p_group[2] )
1046 const unsigned i_channels = p_group[0].i_channels +
1047 ( p_group[1].b_used ? p_group[1].i_channels : 0 );
1048 uint8_t *p_out = p_aout_buffer->p_buffer;
1050 while( p_block->i_buffer > 0 )
1052 for( int i = 0; i < 2; i++ )
1054 const aob_group_t *g = &p_group[1-i];
1055 const unsigned int i_group_size = 2 * g->i_channels * i_bits / 8;
1057 if( p_block->i_buffer < i_group_size )
1059 p_block->i_buffer = 0;
1062 for( unsigned n = 0; n < 2; n++ )
1064 for( unsigned j = 0; j < g->i_channels && g->b_used; j++ )
1066 const int i_src = n * g->i_channels + j;
1067 const int i_dst = n * i_channels + g->pi_position[j];
1071 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
1072 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
1073 p_out[3*i_dst+2] = p_block->p_buffer[4*g->i_channels+i_src];
1075 else if( i_bits == 20 )
1077 p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
1078 p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
1080 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] ) & 0xf0;
1082 p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] << 4) & 0xf0;
1086 assert( i_bits == 16 );
1087 p_out[2*i_dst+0] = p_block->p_buffer[2*i_src+0];
1088 p_out[2*i_dst+1] = p_block->p_buffer[2*i_src+1];
1093 p_block->i_buffer -= i_group_size;
1094 p_block->p_buffer += i_group_size;
1097 p_out += (i_bits == 16 ? 2 : 3) * i_channels * 2;
1101 static void BdExtract( block_t *p_aout_buffer, block_t *p_block,
1102 unsigned i_frame_length,
1103 unsigned i_channels, unsigned i_channels_padding,
1106 if( i_bits != 16 || i_channels_padding > 0 )
1108 uint8_t *p_src = p_block->p_buffer;
1109 uint8_t *p_dst = p_aout_buffer->p_buffer;
1110 int dst_inc = ((i_bits == 16) ? 2 : 4) * i_channels;
1112 while( i_frame_length > 0 )
1114 #ifdef WORDS_BIGENDIAN
1115 memcpy( p_dst, p_src, i_channels * i_bits / 8 );
1118 swab( p_src, p_dst, (i_channels + i_channels_padding) * i_bits / 8 );
1121 p_dst[1] = p_src[2];
1122 p_dst[2] = p_src[1];
1123 p_dst[3] = p_src[0];
1126 p_src += (i_channels + i_channels_padding) * i_bits / 8;
1133 #ifdef WORDS_BIGENDIAN
1134 memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );
1136 swab( p_block->p_buffer, p_aout_buffer->p_buffer, p_block->i_buffer );