Commit 57be8520 authored by Rafaël Carré's avatar Rafaël Carré Committed by Thomas Guillem
Browse files

a52tospdif: add DTS support


Modified-By: Thomas Guillem's avatarThomas Guillem <thomas@gllm.fr>
Signed-off-by: Thomas Guillem's avatarThomas Guillem <thomas@gllm.fr>
parent 640a8917
/*****************************************************************************
* a52tospdif.c : encapsulates A/52 frames into S/PDIF packets
* a52tospdif.c : encapsulates A/52 and DTS frames into S/PDIF packets
*****************************************************************************
* Copyright (C) 2002, 2006 VLC authors and VideoLAN
* Copyright (C) 2002, 2006-2016 VLC authors and VideoLAN
* $Id$
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Stéphane Borel <stef@via.ecp.fr>
* Rémi Denis-Courmont
* Rafaël Carré
* Thomas Guillem
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
......@@ -30,6 +33,8 @@
# include "config.h"
#endif
#include <assert.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
......@@ -48,7 +53,7 @@ static block_t *DoWork( filter_t *, block_t * );
vlc_module_begin ()
set_category( CAT_AUDIO )
set_subcategory( SUBCAT_AUDIO_MISC )
set_description( N_("Audio filter for A/52->S/PDIF encapsulation") )
set_description( N_("Audio filter for A/52/DTS->S/PDIF encapsulation") )
set_capability( "audio converter", 10 )
set_callbacks( Create, NULL )
vlc_module_end ()
......@@ -60,54 +65,112 @@ static int Create( vlc_object_t *p_this )
{
filter_t * p_filter = (filter_t *)p_this;
if ( p_filter->fmt_in.audio.i_format != VLC_CODEC_A52 ||
( p_filter->fmt_out.audio.i_format != VLC_CODEC_SPDIFB &&
p_filter->fmt_out.audio.i_format != VLC_CODEC_SPDIFL ) )
{
if( ( p_filter->fmt_in.audio.i_format != VLC_CODEC_DTS &&
p_filter->fmt_in.audio.i_format != VLC_CODEC_A52 ) ||
( p_filter->fmt_out.audio.i_format != VLC_CODEC_SPDIFL &&
p_filter->fmt_out.audio.i_format != VLC_CODEC_SPDIFB ) )
return VLC_EGENERIC;
}
p_filter->pf_audio_filter = DoWork;
return VLC_SUCCESS;
}
static uint16_t get_data_type( filter_t *p_filter, block_t *p_in )
{
#define IEC61937_AC3 0x01
#define IEC61937_DTS1 0x0B
#define IEC61937_DTS2 0x0C
#define IEC61937_DTS3 0x0D
switch( p_filter->fmt_in.audio.i_format )
{
case VLC_CODEC_A52:
if( unlikely( p_in->i_buffer < 6 ) )
return 0;
return ( (p_in->p_buffer[5] & 0x7) << 8 ) /* bsmod */ | IEC61937_AC3;
case VLC_CODEC_DTS:
if( unlikely( p_in->i_buffer < 1 ) )
return 0;
switch( p_in->i_nb_samples )
{
case 512: return IEC61937_DTS1;
case 1024: return IEC61937_DTS2;
case 2048: return IEC61937_DTS3;
default:
msg_Err( p_filter, "Frame size %d not supported",
p_in->i_nb_samples );
return 0;
}
default:
vlc_assert_unreachable();
}
return 0;
}
static bool is_big_endian( filter_t *p_filter, block_t *p_in )
{
switch( p_filter->fmt_in.audio.i_format )
{
case VLC_CODEC_A52:
return true;
case VLC_CODEC_DTS:
return p_in->p_buffer[0] == 0x1F || p_in->p_buffer[0] == 0x7F;
default:
vlc_assert_unreachable();
}
return 0;
}
/*****************************************************************************
* DoWork: convert a buffer
*****************************************************************************/
static block_t *DoWork( filter_t * p_filter, block_t *p_in_buf )
{
/* AC3 is natively big endian. Most SPDIF devices have the native
* endianness of the computer system.
* On Mac OS X however, little endian devices are also common.
*/
static const uint8_t p_sync_le[6] = { 0x72, 0xF8, 0x1F, 0x4E, 0x01, 0x00 };
static const uint8_t p_sync_be[6] = { 0xF8, 0x72, 0x4E, 0x1F, 0x00, 0x01 };
uint16_t i_frame_size = p_in_buf->i_buffer / 2;
uint16_t i_length = p_in_buf->i_buffer;
uint8_t * p_in = p_in_buf->p_buffer;
block_t *p_out_buf = NULL;
uint16_t i_data_type = get_data_type( p_filter, p_in_buf );
if( i_data_type == 0 || ( i_length + 8 ) > AOUT_SPDIF_SIZE )
goto out;
block_t *p_out_buf = block_Alloc( AOUT_SPDIF_SIZE );
p_out_buf = block_Alloc( AOUT_SPDIF_SIZE );
if( !p_out_buf )
goto out;
uint8_t * p_out = p_out_buf->p_buffer;
uint8_t *p_out = p_out_buf->p_buffer;
/* Copy the S/PDIF headers. */
if( p_filter->fmt_out.audio.i_format == VLC_CODEC_SPDIFB )
{
memcpy( p_out, p_sync_be, 6 );
p_out[4] = p_in[5] & 0x7; /* bsmod */
SetWBE( p_out + 6, i_frame_size << 4 );
memcpy( &p_out[8], p_in, i_frame_size * 2 );
}
else
void (*write16)(void *, uint16_t) =
( p_filter->fmt_out.audio.i_format == VLC_CODEC_SPDIFB )
? SetWBE : SetWLE;
write16( &p_out[0], 0xf872 ); /* syncword 1 */
write16( &p_out[2], 0x4e1f ); /* syncword 2 */
write16( &p_out[4], i_data_type ); /* data type */
write16( &p_out[6], i_length * 8 ); /* length in bits */
bool b_input_big_endian = is_big_endian( p_filter, p_in_buf );
bool b_output_big_endian =
p_filter->fmt_out.audio.i_format == VLC_CODEC_SPDIFB;
if( b_input_big_endian != b_output_big_endian )
{
memcpy( p_out, p_sync_le, 6 );
p_out[5] = p_in[5] & 0x7; /* bsmod */
SetWLE( p_out + 6, i_frame_size << 4 );
swab( p_in, &p_out[8], i_frame_size * 2 );
}
memset( p_out + 8 + i_frame_size * 2, 0,
AOUT_SPDIF_SIZE - i_frame_size * 2 - 8 );
swab( p_in, p_out + 8, i_length & ~1 );
/* If i_length is odd, we have to adjust swapping a bit... */
if( i_length & 1 && ( i_length + 9 ) <= AOUT_SPDIF_SIZE )
{
p_out[8 + i_length - 1] = 0;
p_out[8 + i_length] = p_in[i_length-1];
i_length++;
}
} else
memcpy( p_out + 8, p_in, i_length );
if( 8 + i_length < AOUT_SPDIF_SIZE ) /* padding */
memset( p_out + 8 + i_length, 0, AOUT_SPDIF_SIZE - i_length - 8 );
p_out_buf->i_dts = p_in_buf->i_dts;
p_out_buf->i_pts = p_in_buf->i_pts;
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment