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vlc/modules/codec/lpcm.c

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/*****************************************************************************
* lpcm.c: lpcm decoder/packetizer module
*****************************************************************************
* Copyright (C) 1999-2008 the VideoLAN team
* $Id$
*
* Authors: Samuel Hocevar <sam@zoy.org>
* Henri Fallon <henri@videolan.org>
* Christophe Massiot <massiot@via.ecp.fr>
* Gildas Bazin <gbazin@videolan.org>
* Lauren Aimar <fenrir _AT_ videolan _DOT_ org >
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_codec.h>
#include <vlc_aout.h>
#include <assert.h>
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int OpenDecoder ( vlc_object_t * );
static int OpenPacketizer( vlc_object_t * );
static void CloseCommon ( vlc_object_t * );
vlc_module_begin ()
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_ACODEC )
set_description( N_("Linear PCM audio decoder") )
set_capability( "decoder", 100 )
set_callbacks( OpenDecoder, CloseCommon )
add_submodule ()
set_description( N_("Linear PCM audio packetizer") )
set_capability( "packetizer", 100 )
set_callbacks( OpenPacketizer, CloseCommon )
vlc_module_end ()
/*****************************************************************************
* decoder_sys_t : lpcm decoder descriptor
*****************************************************************************/
struct decoder_sys_t
{
/* Module mode */
bool b_packetizer;
/*
* Output properties
*/
date_t end_date;
/* */
unsigned i_header_size;
int i_type;
};
/*
* LPCM DVD header :
* - frame number (8 bits)
* - unknown (16 bits) == 0x0003 ?
* - unknown (4 bits)
* - current frame (4 bits)
* - unknown (2 bits)
* - frequency (2 bits) 0 == 48 kHz, 1 == 32 kHz, 2 == ?, 3 == ?
* - unknown (1 bit)
* - number of channels - 1 (3 bits) 1 == 2 channels
* - start code (8 bits) == 0x80
*
* LPCM DVD-A header (http://dvd-audio.sourceforge.net/spec/aob.shtml)
* - continuity counter (8 bits, clipped to 0x00-0x1f)
* - header size (16 bits)
* - byte pointer to start of first audio frame.
* - unknown (8bits, 0x10 for stereo, 0x00 for surround)
* - sample size (4+4 bits)
* - samplerate (4+4 bits)
* - unknown (8 bits)
* - group assignment (8 bits)
* - unknown (8 bits)
* - padding(variable)
*
* LPCM BD header :
* - unkown (16 bits)
* - number of channels (4 bits)
* - frequency (4 bits)
* - bits per sample (2 bits)
* - unknown (6 bits)
*/
#define LPCM_VOB_HEADER_LEN (6)
#define LPCM_AOB_HEADER_LEN (11)
#define LPCM_BD_HEADER_LEN (4)
enum
{
LPCM_VOB,
LPCM_AOB,
LPCM_BD,
};
typedef struct
{
unsigned i_channels;
bool b_used;
unsigned pi_position[6];
} aob_group_t;
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static void *DecodeFrame ( decoder_t *, block_t ** );
/* */
static int VobHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_original_channels,
unsigned *pi_bits,
const uint8_t *p_header );
static void VobExtract( aout_buffer_t *, block_t *, unsigned i_bits );
/* */
static int AobHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_layout,
unsigned *pi_bits,
unsigned *pi_padding,
aob_group_t g[2],
const uint8_t *p_header );
static void AobExtract( aout_buffer_t *, block_t *, unsigned i_bits, aob_group_t p_group[2] );
/* */
static int BdHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_original_channels,
unsigned *pi_bits,
const uint8_t *p_header );
static void BdExtract( aout_buffer_t *, block_t * );
/*****************************************************************************
* OpenCommon:
*****************************************************************************/
static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
int i_type;
int i_header_size;
switch( p_dec->fmt_in.i_codec )
{
/* DVD LPCM */
case VLC_CODEC_DVD_LPCM:
i_type = LPCM_VOB;
i_header_size = LPCM_VOB_HEADER_LEN;
break;
/* DVD-Audio LPCM */
case VLC_CODEC_DVDA_LPCM:
i_type = LPCM_AOB;
i_header_size = LPCM_AOB_HEADER_LEN;
break;
/* BD LPCM */
case VLC_CODEC_BD_LPCM:
i_type = LPCM_BD;
i_header_size = LPCM_BD_HEADER_LEN;
break;
default:
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_dec->p_sys = p_sys = malloc(sizeof(decoder_sys_t)) ) == NULL )
return VLC_ENOMEM;
/* Misc init */
p_sys->b_packetizer = b_packetizer;
date_Set( &p_sys->end_date, 0 );
p_sys->i_type = i_type;
p_sys->i_header_size = i_header_size;
/* Set output properties */
p_dec->fmt_out.i_cat = AUDIO_ES;
if( b_packetizer )
{
switch( i_type )
{
case LPCM_VOB:
p_dec->fmt_out.i_codec = VLC_CODEC_DVD_LPCM;
break;
case LPCM_AOB:
p_dec->fmt_out.i_codec = VLC_CODEC_DVDA_LPCM;
break;
default:
assert(0);
case LPCM_BD:
p_dec->fmt_out.i_codec = VLC_CODEC_BD_LPCM;
break;
}
}
else
{
switch( p_dec->fmt_out.audio.i_bitspersample )
{
case 24:
case 20:
p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
p_dec->fmt_out.audio.i_bitspersample = 24;
break;
default:
p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
p_dec->fmt_out.audio.i_bitspersample = 16;
break;
}
}
/* Set callback */
p_dec->pf_decode_audio = (aout_buffer_t *(*)(decoder_t *, block_t **))
DecodeFrame;
p_dec->pf_packetize = (block_t *(*)(decoder_t *, block_t **))
DecodeFrame;
return VLC_SUCCESS;
}
static int OpenDecoder( vlc_object_t *p_this )
{
return OpenCommon( p_this, false );
}
static int OpenPacketizer( vlc_object_t *p_this )
{
return OpenCommon( p_this, true );
}
/*****************************************************************************
* DecodeFrame: decodes an lpcm frame.
****************************************************************************
* Beware, this function must be fed with complete frames (PES packet).
*****************************************************************************/
static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
unsigned int i_rate = 0, i_original_channels = 0, i_channels = 0, i_bits = 0;
int i_frame_length;
if( !pp_block || !*pp_block ) return NULL;
p_block = *pp_block;
*pp_block = NULL; /* So the packet doesn't get re-sent */
/* Date management */
if( p_block->i_pts > VLC_TS_INVALID &&
p_block->i_pts != date_Get( &p_sys->end_date ) )
{
date_Set( &p_sys->end_date, p_block->i_pts );
}
if( !date_Get( &p_sys->end_date ) )
{
/* We've just started the stream, wait for the first PTS. */
block_Release( p_block );
return NULL;
}
if( p_block->i_buffer <= p_sys->i_header_size )
{
msg_Err(p_dec, "frame is too short");
block_Release( p_block );
return NULL;
}
int i_ret;
unsigned i_padding = 0;
aob_group_t p_aob_group[2];
switch( p_sys->i_type )
{
case LPCM_VOB:
i_ret = VobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
p_block->p_buffer );
break;
case LPCM_AOB:
i_ret = AobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits, &i_padding,
p_aob_group,
p_block->p_buffer );
break;
case LPCM_BD:
i_ret = BdHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
p_block->p_buffer );
break;
default:
abort();
}
if( i_ret || p_block->i_buffer <= p_sys->i_header_size + i_padding )
{
msg_Warn( p_dec, "no frame sync or too small frame" );
block_Release( p_block );
return NULL;
}
/* Set output properties */
if( p_dec->fmt_out.audio.i_rate != i_rate )
{
date_Init( &p_sys->end_date, i_rate, 1 );
date_Set( &p_sys->end_date, p_block->i_pts );
}
p_dec->fmt_out.audio.i_rate = i_rate;
p_dec->fmt_out.audio.i_channels = i_channels;
p_dec->fmt_out.audio.i_original_channels = i_original_channels;
p_dec->fmt_out.audio.i_physical_channels = i_original_channels & AOUT_CHAN_PHYSMASK;
i_frame_length = (p_block->i_buffer - p_sys->i_header_size - i_padding) / i_channels * 8 / i_bits;
if( p_sys->b_packetizer )
{
p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
p_block->i_length =
date_Increment( &p_sys->end_date, i_frame_length ) -
p_block->i_pts;
/* Just pass on the incoming frame */
return p_block;
}
else
{
/* */
if( i_bits == 16 )
{
p_dec->fmt_out.i_codec = VLC_CODEC_S16B;
p_dec->fmt_out.audio.i_bitspersample = 16;
}
else
{
p_dec->fmt_out.i_codec = VLC_CODEC_S24B;
p_dec->fmt_out.audio.i_bitspersample = 24;
}
/* */
aout_buffer_t *p_aout_buffer;
p_aout_buffer = decoder_NewAudioBuffer( p_dec, i_frame_length );
if( !p_aout_buffer )
return NULL;
p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
p_aout_buffer->i_length =
date_Increment( &p_sys->end_date, i_frame_length )
- p_aout_buffer->i_pts;
p_block->p_buffer += p_sys->i_header_size + i_padding;
p_block->i_buffer -= p_sys->i_header_size + i_padding;
switch( p_sys->i_type )
{
case LPCM_VOB:
VobExtract( p_aout_buffer, p_block, i_bits );
break;
case LPCM_AOB:
AobExtract( p_aout_buffer, p_block, i_bits, p_aob_group );
break;
default:
assert(0);
case LPCM_BD:
BdExtract( p_aout_buffer, p_block );
break;
}
block_Release( p_block );
return p_aout_buffer;
}
}
/*****************************************************************************
* CloseCommon : lpcm decoder destruction
*****************************************************************************/
static void CloseCommon( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
free( p_dec->p_sys );
}
/*****************************************************************************
*
*****************************************************************************/
static int VobHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_original_channels,
unsigned *pi_bits,
const uint8_t *p_header )
{
const uint8_t i_header = p_header[4];
switch( (i_header >> 4) & 0x3 )
{
case 0:
*pi_rate = 48000;
break;
case 1:
*pi_rate = 96000;
break;
case 2:
*pi_rate = 44100;
break;
case 3:
*pi_rate = 32000;
break;
}
*pi_channels = (i_header & 0x7) + 1;
switch( *pi_channels - 1 )
{
case 0:
*pi_original_channels = AOUT_CHAN_CENTER;
break;
case 1:
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
break;
case 2:
/* This is unsure. */
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE;
break;
case 3:
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
break;
case 4:
/* This is unsure. */
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
| AOUT_CHAN_LFE;
break;
case 5:
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
| AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
break;
case 6:
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
| AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
| AOUT_CHAN_MIDDLERIGHT;
break;
case 7:
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
| AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
| AOUT_CHAN_CENTER | AOUT_CHAN_MIDDLELEFT
| AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE;
break;
}
switch( (i_header >> 6) & 0x3 )
{
case 2:
*pi_bits = 24;
break;
case 1:
*pi_bits = 20;
break;
case 0:
default:
*pi_bits = 16;
break;
}
/* Check frame sync and drop it. */
if( p_header[5] != 0x80 )
return -1;
return 0;
}
static const unsigned p_aob_group1[21][6] = {
{ AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
};
static const unsigned p_aob_group2[21][6] = {
{ 0 },
{ 0 },
{ AOUT_CHAN_REARCENTER, 0 },
{ AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_LFE, 0 },
{ AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
{ AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, 0 },
{ AOUT_CHAN_CENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
{ AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
{ AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_REARCENTER, 0 },
{ AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_LFE, 0 },
{ AOUT_CHAN_LFE, AOUT_CHAN_REARCENTER, 0 },
{ AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, 0 },
{ AOUT_CHAN_LFE, 0 },
{ AOUT_CHAN_CENTER, 0 },
{ AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 },
};
static int AobHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_layout,
unsigned *pi_bits,
unsigned *pi_padding,
aob_group_t g[2],
const uint8_t *p_header )
{
const unsigned i_header_size = GetWBE( &p_header[1] );
if( i_header_size + 3 < LPCM_AOB_HEADER_LEN )
return VLC_EGENERIC;
*pi_padding = 3+i_header_size - LPCM_AOB_HEADER_LEN;
const int i_index_size_g1 = (p_header[6] >> 4) & 0x0f;
const int i_index_size_g2 = (p_header[6] ) & 0x0f;
const int i_index_rate_g1 = (p_header[7] >> 4) & 0x0f;
const int i_index_rate_g2 = (p_header[7] ) & 0x0f;
const int i_assignment = p_header[9];
/* Validate */
if( i_index_size_g1 > 0x02 ||
( i_index_size_g2 != 0x0f && i_index_size_g2 > 0x02 ) )
return VLC_EGENERIC;
if( (i_index_rate_g1 & 0x07) > 0x02 ||
( i_index_rate_g2 != 0x0f && (i_index_rate_g1 & 0x07) > 0x02 ) )
return VLC_EGENERIC;
if( i_assignment > 20 )
return VLC_EGENERIC;
/* */
*pi_bits = 16 + 4 * i_index_size_g1;
if( i_index_rate_g1 & 0x08 )
*pi_rate = 44100 << (i_index_rate_g1 & 0x07);
else
*pi_rate = 48000 << (i_index_rate_g1 & 0x07);
/* Group1 */
unsigned i_channels1 = 0;
unsigned i_layout1 = 0;
for( int i = 0; p_aob_group1[i_assignment][i] != 0; i++ )
{
i_channels1++;
i_layout1 |= p_aob_group1[i_assignment][i];
}
/* Group2 */
unsigned i_channels2 = 0;
unsigned i_layout2 = 0;
if( i_index_size_g2 != 0x0f && i_index_rate_g2 != 0x0f )
{
for( int i = 0; p_aob_group2[i_assignment][i] != 0; i++ )
{
i_channels2++;
i_layout2 |= p_aob_group2[i_assignment][i];
}
assert( (i_layout1 & i_layout2) == 0 );
}
/* It is enabled only when presents and compatible wih group1 */
const bool b_group2_used = i_index_size_g1 == i_index_size_g2 &&
i_index_rate_g1 == i_index_rate_g2;
/* */
*pi_channels = i_channels1 + ( b_group2_used ? i_channels2 : 0 );
*pi_layout = i_layout1 | ( b_group2_used ? i_layout2 : 0 );
/* */
for( unsigned i = 0; i < 2; i++ )
{
const unsigned *p_aob = i == 0 ? p_aob_group1[i_assignment] :
p_aob_group2[i_assignment];
g[i].i_channels = i == 0 ? i_channels1 :
i_channels2;
g[i].b_used = i == 0 || b_group2_used;
if( !g[i].b_used )
continue;
for( unsigned j = 0; j < g[i].i_channels; j++ )
{
g[i].pi_position[j] = 0;
for( int k = 0; pi_vlc_chan_order_wg4[k] != 0; k++ )
{
const unsigned i_channel = pi_vlc_chan_order_wg4[k];
if( i_channel == p_aob[j] )
break;
if( (*pi_layout) & i_channel )
g[i].pi_position[j]++;
}
}
}
return VLC_SUCCESS;
}
static int BdHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_original_channels,
unsigned *pi_bits,
const uint8_t *p_header )
{
const uint32_t h = GetDWBE( p_header );
switch( ( h & 0xf000) >> 12 )
{
case 1:
*pi_channels = 1;
*pi_original_channels = AOUT_CHAN_CENTER;
break;
case 3:
*pi_channels = 2;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
break;
case 4:
*pi_channels = 3;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER;
break;
case 5:
*pi_channels = 3;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER;
break;
case 6:
*pi_channels = 4;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARCENTER;
break;
case 7:
*pi_channels = 4;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
break;
case 8:
*pi_channels = 5;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
break;
case 9:
*pi_channels = 6;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
AOUT_CHAN_LFE;
break;
case 10:
*pi_channels = 7;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT;
break;
case 11:
*pi_channels = 8;
*pi_original_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
AOUT_CHAN_LFE;
break;
default:
return -1;
}
switch( (h >> 6) & 0x03 )
{
case 1:
*pi_bits = 16;
break;
case 2: /* 20 bits but samples are stored on 24 bits */
case 3: /* 24 bits */
*pi_bits = 24;
break;
default:
return -1;
}
switch( (h >> 8) & 0x0f )
{
case 1:
*pi_rate = 48000;
break;
case 4:
*pi_rate = 96000;
break;
case 5:
*pi_rate = 192000;
break;
default:
return -1;
}
return 0;
}
static void VobExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
unsigned i_bits )
{
uint8_t *p_out = p_aout_buffer->p_buffer;
/* 20/24 bits LPCM use special packing */
if( i_bits == 24 )
{
while( p_block->i_buffer / 12 )
{
/* Sample 1 */
p_out[0] = p_block->p_buffer[0];
p_out[1] = p_block->p_buffer[1];
p_out[2] = p_block->p_buffer[8];
/* Sample 2 */
p_out[3] = p_block->p_buffer[2];
p_out[4] = p_block->p_buffer[3];
p_out[5] = p_block->p_buffer[9];
/* Sample 3 */
p_out[6] = p_block->p_buffer[4];
p_out[7] = p_block->p_buffer[5];
p_out[8] = p_block->p_buffer[10];
/* Sample 4 */
p_out[9] = p_block->p_buffer[6];
p_out[10] = p_block->p_buffer[7];
p_out[11] = p_block->p_buffer[11];
p_block->i_buffer -= 12;
p_block->p_buffer += 12;
p_out += 12;
}
}
else if( i_bits == 20 )
{
while( p_block->i_buffer / 10 )
{
/* Sample 1 */
p_out[0] = p_block->p_buffer[0];
p_out[1] = p_block->p_buffer[1];
p_out[2] = p_block->p_buffer[8] & 0xF0;
/* Sample 2 */
p_out[3] = p_block->p_buffer[2];
p_out[4] = p_block->p_buffer[3];
p_out[5] = p_block->p_buffer[8] << 4;
/* Sample 3 */
p_out[6] = p_block->p_buffer[4];
p_out[7] = p_block->p_buffer[5];
p_out[8] = p_block->p_buffer[9] & 0xF0;
/* Sample 4 */
p_out[9] = p_block->p_buffer[6];
p_out[10] = p_block->p_buffer[7];
p_out[11] = p_block->p_buffer[9] << 4;
p_block->i_buffer -= 10;
p_block->p_buffer += 10;
p_out += 12;
}
}
else
{
assert( i_bits == 16 );
memcpy( p_out, p_block->p_buffer, p_block->i_buffer );
}
}
static void AobExtract( aout_buffer_t *p_aout_buffer,
block_t *p_block, unsigned i_bits, aob_group_t p_group[2] )
{
const unsigned i_channels = p_group[0].i_channels +
( p_group[1].b_used ? p_group[1].i_channels : 0 );
uint8_t *p_out = p_aout_buffer->p_buffer;
while( p_block->i_buffer > 0 )
{
for( int i = 0; i < 2; i++ )
{
const aob_group_t *g = &p_group[1-i];
const unsigned int i_group_size = 2 * g->i_channels * i_bits / 8;
if( p_block->i_buffer < i_group_size )
{
p_block->i_buffer = 0;
break;
}
for( unsigned n = 0; n < 2; n++ )
{
for( unsigned j = 0; j < g->i_channels && g->b_used; j++ )
{
const int i_src = n * g->i_channels + j;
const int i_dst = n * i_channels + g->pi_position[j];
if( i_bits == 24 )
{
p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
p_out[3*i_dst+2] = p_block->p_buffer[4*g->i_channels+i_src];
}
else if( i_bits == 20 )
{
p_out[3*i_dst+0] = p_block->p_buffer[2*i_src+0];
p_out[3*i_dst+1] = p_block->p_buffer[2*i_src+1];
if( n == 0 )
p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] ) & 0xf0;
else
p_out[3*i_dst+2] = (p_block->p_buffer[4*g->i_channels+i_src] << 4) & 0xf0;
}
else
{
assert( i_bits == 16 );
p_out[2*i_dst+0] = p_block->p_buffer[2*i_src+0];
p_out[2*i_dst+1] = p_block->p_buffer[2*i_src+1];
}
}
}
p_block->i_buffer -= i_group_size;
p_block->p_buffer += i_group_size;
}
/* */
p_out += (i_bits == 16 ? 2 : 3) * i_channels * 2;
}
}
static void BdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block )
{
memcpy( p_aout_buffer->p_buffer, p_block->p_buffer, p_block->i_buffer );
}