Commit 6db7ccc4 authored by Laurent Aimar's avatar Laurent Aimar
Browse files

Added LPCM from AOB suport to our LPCM decoder.

Audio channels in AOB can be separated into two groups with different
properties (bits/sample and/or samplerate). In this case, the second group
is ignored.
parent 852c9213
......@@ -76,7 +76,7 @@ struct decoder_sys_t
/* */
unsigned i_header_size;
bool b_dvd;
int i_type;
};
/*
......@@ -91,6 +91,18 @@ struct decoder_sys_t
* - 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)
......@@ -99,19 +111,44 @@ struct decoder_sys_t
* - unknown (6 bits)
*/
#define LPCM_DVD_HEADER_LEN (6)
#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 DvdHeader( unsigned *pi_rate,
/* */
static int VobHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_original_channels,
unsigned *pi_bits,
const uint8_t *p_header );
static void DvdExtract( aout_buffer_t *, block_t *, unsigned i_bits );
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,
......@@ -126,17 +163,25 @@ static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
{
decoder_t *p_dec = (decoder_t*)p_this;
decoder_sys_t *p_sys;
bool b_dvd;
int i_type;
int i_header_size;
switch( p_dec->fmt_in.i_codec )
{
/* DVD LPCM */
case VLC_CODEC_DVD_LPCM:
b_dvd = true;
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:
b_dvd = false;
i_type = LPCM_BD;
i_header_size = LPCM_BD_HEADER_LEN;
break;
default:
return VLC_EGENERIC;
......@@ -149,15 +194,28 @@ static int OpenCommon( vlc_object_t *p_this, bool b_packetizer )
/* Misc init */
p_sys->b_packetizer = b_packetizer;
aout_DateSet( &p_sys->end_date, 0 );
p_sys->i_header_size = b_dvd ? LPCM_DVD_HEADER_LEN : LPCM_BD_HEADER_LEN;
p_sys->b_dvd = b_dvd;
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 )
{
p_dec->fmt_out.i_codec = b_dvd ? VLC_CODEC_DVD_LPCM : VLC_CODEC_BD_LPCM;
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
{
......@@ -231,16 +289,32 @@ static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
}
int i_ret;
if( p_sys->b_dvd )
i_ret = DvdHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
unsigned i_padding;
aob_group_t p_aob_group[2];
switch( p_sys->i_type )
{
case LPCM_VOB:
i_padding = 0;
i_ret = VobHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
p_block->p_buffer );
else
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;
default:
assert(0);
case LPCM_BD:
i_padding = 0;
i_ret = BdHeader( &i_rate, &i_channels, &i_original_channels, &i_bits,
p_block->p_buffer );
break;
}
if( i_ret )
if( i_ret || p_block->i_buffer <= p_sys->i_header_size + i_padding )
{
msg_Warn( p_dec, "no frame sync" );
msg_Warn( p_dec, "no frame sync or too small frame" );
block_Release( p_block );
return NULL;
}
......@@ -256,7 +330,7 @@ static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
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_channels * 8 / i_bits;
i_frame_length = (p_block->i_buffer - p_sys->i_header_size - i_padding) / i_channels * 8 / i_bits;
if( p_sys->b_packetizer )
{
......@@ -292,13 +366,23 @@ static void *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
p_aout_buffer->end_date =
aout_DateIncrement( &p_sys->end_date, i_frame_length );
p_block->p_buffer += p_sys->i_header_size;
p_block->i_buffer -= p_sys->i_header_size;
p_block->p_buffer += p_sys->i_header_size + i_padding;
p_block->i_buffer -= p_sys->i_header_size + i_padding;
if( p_sys->b_dvd )
DvdExtract( p_aout_buffer, p_block, i_bits );
else
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;
......@@ -317,7 +401,7 @@ static void CloseCommon( vlc_object_t *p_this )
/*****************************************************************************
*
*****************************************************************************/
static int DvdHeader( unsigned *pi_rate,
static int VobHeader( unsigned *pi_rate,
unsigned *pi_channels, unsigned *pi_original_channels,
unsigned *pi_bits,
const uint8_t *p_header )
......@@ -401,6 +485,146 @@ static int DvdHeader( unsigned *pi_rate,
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( int 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( int 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,
......@@ -492,7 +716,7 @@ static int BdHeader( unsigned *pi_rate,
return 0;
}
static void DvdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
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;
......@@ -556,9 +780,66 @@ static void DvdExtract( aout_buffer_t *p_aout_buffer, block_t *p_block,
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 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( int n = 0; n < 2; n++ )
{
for( int 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 );
}
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