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/*****************************************************************************
* dts_header.c: parse DTS audio headers info
*****************************************************************************
* Copyright (C) 2004-2009 VLC authors and VideoLAN
* $Id: 04c488bf1ea5387474f9048b6d63f5a32897ddc3 $
*
* Authors: Gildas Bazin <gbazin@netcourrier.com>
* Laurent Aimar
*
* 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
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_bits.h>
#include "dts_header.h"
#include <assert.h>
static int SyncInfo16be( const uint8_t *p_buf,
unsigned int *pi_audio_mode,
unsigned int *pi_sample_rate,
unsigned int *pi_bit_rate,
unsigned int *pi_frame_length )
{
unsigned int frame_size;
unsigned int i_lfe;
*pi_frame_length = (p_buf[4] & 0x01) << 6 | (p_buf[5] >> 2);
frame_size = (p_buf[5] & 0x03) << 12 | (p_buf[6] << 4) | (p_buf[7] >> 4);
*pi_audio_mode = (p_buf[7] & 0x0f) << 2 | (p_buf[8] >> 6);
*pi_sample_rate = (p_buf[8] >> 2) & 0x0f;
*pi_bit_rate = (p_buf[8] & 0x03) << 3 | ((p_buf[9] >> 5) & 0x07);
i_lfe = (p_buf[10] >> 1) & 0x03;
if( i_lfe ) *pi_audio_mode |= 0x10000;
return frame_size + 1;
}
static void BufLeToBe( uint8_t *p_out, const uint8_t *p_in, int i_in )
{
int i;
for( i = 0; i < i_in/2; i++ )
{
p_out[i*2] = p_in[i*2+1];
p_out[i*2+1] = p_in[i*2];
}
}
static int Buf14To16( uint8_t *p_out, const uint8_t *p_in, int i_in, int i_le )
{
unsigned char tmp, cur = 0;
int bits_in, bits_out = 0;
int i, i_out = 0;
for( i = 0; i < i_in; i++ )
{
if( i%2 )
{
tmp = p_in[i-i_le];
bits_in = 8;
}
else
{
tmp = p_in[i+i_le] & 0x3F;
bits_in = 8 - 2;
}
if( bits_out < 8 )
{
int need = __MIN( 8 - bits_out, bits_in );
cur <<= need;
cur |= ( tmp >> (bits_in - need) );
tmp <<= (8 - bits_in + need);
tmp >>= (8 - bits_in + need);
bits_in -= need;
bits_out += need;
}
if( bits_out == 8 )
{
p_out[i_out] = cur;
cur = 0;
bits_out = 0;
i_out++;
}
bits_out += bits_in;
cur <<= bits_in;
cur |= tmp;
}
return i_out;
}
int SyncCode( const uint8_t *p_buf )
{
/* 14 bits, little endian version of the bitstream */
if( p_buf[0] == 0xff && p_buf[1] == 0x1f &&
p_buf[2] == 0x00 && p_buf[3] == 0xe8 &&
(p_buf[4] & 0xf0) == 0xf0 && p_buf[5] == 0x07 )
{
return VLC_SUCCESS;
}
/* 14 bits, big endian version of the bitstream */
else if( p_buf[0] == 0x1f && p_buf[1] == 0xff &&
p_buf[2] == 0xe8 && p_buf[3] == 0x00 &&
p_buf[4] == 0x07 && (p_buf[5] & 0xf0) == 0xf0 )
{
return VLC_SUCCESS;
}
/* 16 bits, big endian version of the bitstream */
else if( p_buf[0] == 0x7f && p_buf[1] == 0xfe &&
p_buf[2] == 0x80 && p_buf[3] == 0x01 )
{
return VLC_SUCCESS;
}
/* 16 bits, little endian version of the bitstream */
else if( p_buf[0] == 0xfe && p_buf[1] == 0x7f &&
p_buf[2] == 0x01 && p_buf[3] == 0x80 )
{
return VLC_SUCCESS;
}
/* DTS-HD */
else if( p_buf[0] == 0x64 && p_buf[1] == 0x58 &&
p_buf[2] == 0x20 && p_buf[3] == 0x25 )
{
return VLC_SUCCESS;
}
return VLC_EGENERIC;
}
int GetSyncInfo( const uint8_t *p_buf,
bool *pb_dts_hd,
unsigned int *pi_sample_rate,
unsigned int *pi_bit_rate,
unsigned int *pi_frame_length,
unsigned int *pi_audio_mode )
{
unsigned int i_frame_size;
/* 14 bits, little endian version of the bitstream */
if( p_buf[0] == 0xff && p_buf[1] == 0x1f &&
p_buf[2] == 0x00 && p_buf[3] == 0xe8 &&
(p_buf[4] & 0xf0) == 0xf0 && p_buf[5] == 0x07 )
{
uint8_t conv_buf[DTS_HEADER_SIZE];
Buf14To16( conv_buf, p_buf, DTS_HEADER_SIZE, 1 );
i_frame_size = SyncInfo16be( conv_buf, pi_audio_mode, pi_sample_rate,
pi_bit_rate, pi_frame_length );
i_frame_size = i_frame_size * 8 / 14 * 2;
}
/* 14 bits, big endian version of the bitstream */
else if( p_buf[0] == 0x1f && p_buf[1] == 0xff &&
p_buf[2] == 0xe8 && p_buf[3] == 0x00 &&
p_buf[4] == 0x07 && (p_buf[5] & 0xf0) == 0xf0 )
{
uint8_t conv_buf[DTS_HEADER_SIZE];
Buf14To16( conv_buf, p_buf, DTS_HEADER_SIZE, 0 );
i_frame_size = SyncInfo16be( conv_buf, pi_audio_mode, pi_sample_rate,
pi_bit_rate, pi_frame_length );
i_frame_size = i_frame_size * 8 / 14 * 2;
}
/* 16 bits, big endian version of the bitstream */
else if( p_buf[0] == 0x7f && p_buf[1] == 0xfe &&
p_buf[2] == 0x80 && p_buf[3] == 0x01 )
{
i_frame_size = SyncInfo16be( p_buf, pi_audio_mode, pi_sample_rate,
pi_bit_rate, pi_frame_length );
}
/* 16 bits, little endian version of the bitstream */
else if( p_buf[0] == 0xfe && p_buf[1] == 0x7f &&
p_buf[2] == 0x01 && p_buf[3] == 0x80 )
{
uint8_t conv_buf[DTS_HEADER_SIZE];
BufLeToBe( conv_buf, p_buf, DTS_HEADER_SIZE );
i_frame_size = SyncInfo16be( p_buf, pi_audio_mode, pi_sample_rate,
pi_bit_rate, pi_frame_length );
}
/* DTS-HD */
else if( p_buf[0] == 0x64 && p_buf[1] == 0x58 &&
p_buf[2] == 0x20 && p_buf[3] == 0x25 )
{
int i_dts_hd_size;
bs_t s;
bs_init( &s, &p_buf[4], DTS_HEADER_SIZE - 4 );
bs_skip( &s, 8 + 2 );
if( bs_read1( &s ) )
{
bs_skip( &s, 12 );
i_dts_hd_size = bs_read( &s, 20 ) + 1;
}
else
{
bs_skip( &s, 8 );
i_dts_hd_size = bs_read( &s, 16 ) + 1;
}
//uint16_t s0 = bs_read( &s, 16 );
//uint16_t s1 = bs_read( &s, 16 );
//fprintf( stderr, "DTS HD=%d : %x %x\n", i_dts_hd_size, s0, s1 );
*pb_dts_hd = true;
/* As we ignore the stream, do not modify those variables:
*pi_channels = ;
*pi_channels_conf = ;
*pi_sample_rate = ;
*pi_bit_rate = ;
*pi_frame_length = ;
*/
return i_dts_hd_size;
}
else
{
return VLC_EGENERIC;
}
*pb_dts_hd = false;
return i_frame_size;
}
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