You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
558 lines
16 KiB
558 lines
16 KiB
/*****************************************************************************
|
|
* mlp.c: packetize MLP/TrueHD audio
|
|
*****************************************************************************
|
|
* Copyright (C) 2008 Laurent Aimar
|
|
* $Id$
|
|
*
|
|
* Authors: Laurent 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 <vlc_block_helper.h>
|
|
#include <vlc_bits.h>
|
|
#include <assert.h>
|
|
|
|
/*****************************************************************************
|
|
* Module descriptor
|
|
*****************************************************************************/
|
|
static int Open ( vlc_object_t * );
|
|
static void Close( vlc_object_t * );
|
|
|
|
vlc_module_begin ()
|
|
set_category( CAT_SOUT )
|
|
set_subcategory( SUBCAT_SOUT_PACKETIZER )
|
|
set_description( N_("MLP/TrueHD parser") )
|
|
set_capability( "packetizer", 50 )
|
|
set_callbacks( Open, Close )
|
|
vlc_module_end ()
|
|
|
|
/*****************************************************************************
|
|
*
|
|
*****************************************************************************/
|
|
typedef struct
|
|
{
|
|
int i_type;
|
|
unsigned i_rate;
|
|
unsigned i_channels;
|
|
int i_channels_conf;
|
|
unsigned i_samples;
|
|
|
|
bool b_vbr;
|
|
unsigned i_bitrate;
|
|
|
|
unsigned i_substreams;
|
|
|
|
} mlp_header_t;
|
|
|
|
struct decoder_sys_t
|
|
{
|
|
/*
|
|
* Input properties
|
|
*/
|
|
int i_state;
|
|
|
|
block_bytestream_t bytestream;
|
|
|
|
/*
|
|
* Common properties
|
|
*/
|
|
date_t end_date;
|
|
|
|
mtime_t i_pts;
|
|
int i_frame_size;
|
|
|
|
bool b_mlp;
|
|
mlp_header_t mlp;
|
|
};
|
|
|
|
enum {
|
|
|
|
STATE_NOSYNC,
|
|
STATE_SYNC,
|
|
STATE_HEADER,
|
|
STATE_NEXT_SYNC,
|
|
STATE_GET_DATA,
|
|
STATE_SEND_DATA
|
|
};
|
|
|
|
#define MLP_MAX_SUBSTREAMS (16)
|
|
#define MLP_HEADER_SYNC (28)
|
|
#define MLP_HEADER_SIZE (4 + MLP_HEADER_SYNC + 4 * MLP_MAX_SUBSTREAMS)
|
|
|
|
static const uint8_t pu_start_code[3] = { 0xf8, 0x72, 0x6f };
|
|
|
|
/****************************************************************************
|
|
* Local prototypes
|
|
****************************************************************************/
|
|
static block_t *Packetize( decoder_t *, block_t **pp_block );
|
|
static int SyncInfo( const uint8_t *p_hdr, bool *pb_mlp, mlp_header_t *p_mlp );
|
|
static int SyncInfoDolby( const uint8_t *p_buf );
|
|
|
|
/*****************************************************************************
|
|
* Open: probe the decoder/packetizer and return score
|
|
*****************************************************************************/
|
|
static int Open( vlc_object_t *p_this )
|
|
{
|
|
decoder_t *p_dec = (decoder_t*)p_this;
|
|
decoder_sys_t *p_sys;
|
|
|
|
if( p_dec->fmt_in.i_codec != VLC_CODEC_MLP &&
|
|
p_dec->fmt_in.i_codec != VLC_CODEC_TRUEHD )
|
|
return VLC_EGENERIC;
|
|
|
|
/* */
|
|
p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) );
|
|
if( !p_sys )
|
|
return VLC_ENOMEM;
|
|
|
|
/* */
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
date_Set( &p_sys->end_date, 0 );
|
|
|
|
p_sys->bytestream = block_BytestreamInit();
|
|
p_sys->b_mlp = false;
|
|
|
|
/* Set output properties */
|
|
p_dec->fmt_out.i_cat = AUDIO_ES;
|
|
p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
|
|
p_dec->fmt_out.audio.i_rate = 0;
|
|
|
|
/* Set callback */
|
|
p_dec->pf_packetize = Packetize;
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Packetize:
|
|
****************************************************************************/
|
|
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
|
|
{
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
uint8_t p_header[MLP_HEADER_SIZE];
|
|
block_t *p_out_buffer;
|
|
|
|
/* */
|
|
if( !pp_block || !*pp_block )
|
|
return NULL;
|
|
|
|
/* */
|
|
if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
|
|
{
|
|
if( (*pp_block)->i_flags&BLOCK_FLAG_CORRUPTED )
|
|
{
|
|
p_sys->b_mlp = false;
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
block_BytestreamEmpty( &p_sys->bytestream );
|
|
}
|
|
date_Set( &p_sys->end_date, 0 );
|
|
block_Release( *pp_block );
|
|
return NULL;
|
|
}
|
|
|
|
if( !date_Get( &p_sys->end_date ) && !(*pp_block)->i_pts )
|
|
{
|
|
/* We've just started the stream, wait for the first PTS. */
|
|
block_Release( *pp_block );
|
|
return NULL;
|
|
}
|
|
|
|
block_BytestreamPush( &p_sys->bytestream, *pp_block );
|
|
|
|
for( ;; )
|
|
{
|
|
switch( p_sys->i_state )
|
|
{
|
|
case STATE_NOSYNC:
|
|
while( !block_PeekBytes( &p_sys->bytestream, p_header, MLP_HEADER_SIZE ) )
|
|
{
|
|
if( SyncInfo( p_header, &p_sys->b_mlp, &p_sys->mlp ) > 0 )
|
|
{
|
|
p_sys->i_state = STATE_SYNC;
|
|
break;
|
|
}
|
|
else if( SyncInfoDolby( p_header ) > 0 )
|
|
{
|
|
p_sys->i_state = STATE_SYNC;
|
|
break;
|
|
}
|
|
block_SkipByte( &p_sys->bytestream );
|
|
}
|
|
if( p_sys->i_state != STATE_SYNC )
|
|
{
|
|
block_BytestreamFlush( &p_sys->bytestream );
|
|
|
|
/* Need more data */
|
|
return NULL;
|
|
}
|
|
|
|
case STATE_SYNC:
|
|
/* New frame, set the Presentation Time Stamp */
|
|
p_sys->i_pts = p_sys->bytestream.p_block->i_pts;
|
|
if( p_sys->i_pts > VLC_TS_INVALID &&
|
|
p_sys->i_pts != date_Get( &p_sys->end_date ) )
|
|
{
|
|
date_Set( &p_sys->end_date, p_sys->i_pts );
|
|
}
|
|
p_sys->i_state = STATE_HEADER;
|
|
|
|
case STATE_HEADER:
|
|
/* Get a MLP header */
|
|
if( block_PeekBytes( &p_sys->bytestream, p_header, MLP_HEADER_SIZE ) )
|
|
{
|
|
/* Need more data */
|
|
return NULL;
|
|
}
|
|
|
|
/* Check if frame is valid and get frame info */
|
|
p_sys->i_frame_size = SyncInfoDolby( p_header );
|
|
if( p_sys->i_frame_size <= 0 )
|
|
p_sys->i_frame_size = SyncInfo( p_header, &p_sys->b_mlp, &p_sys->mlp );
|
|
if( p_sys->i_frame_size <= 0 )
|
|
{
|
|
msg_Dbg( p_dec, "emulated sync word" );
|
|
block_SkipByte( &p_sys->bytestream );
|
|
p_sys->b_mlp = false;
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
break;
|
|
}
|
|
p_sys->i_state = STATE_NEXT_SYNC;
|
|
|
|
case STATE_NEXT_SYNC:
|
|
/* TODO: If pp_block == NULL, flush the buffer without checking the
|
|
* next sync word */
|
|
|
|
/* Check if next expected frame contains the sync word */
|
|
if( block_PeekOffsetBytes( &p_sys->bytestream,
|
|
p_sys->i_frame_size, p_header, MLP_HEADER_SIZE ) )
|
|
{
|
|
/* Need more data */
|
|
return NULL;
|
|
}
|
|
|
|
bool b_mlp = p_sys->b_mlp;
|
|
mlp_header_t mlp = p_sys->mlp;
|
|
if( SyncInfo( p_header, &b_mlp, &mlp ) <= 0 && SyncInfoDolby( p_header ) <= 0 )
|
|
{
|
|
msg_Dbg( p_dec, "emulated sync word "
|
|
"(no sync on following frame)" );
|
|
p_sys->b_mlp = false;
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
block_SkipByte( &p_sys->bytestream );
|
|
break;
|
|
}
|
|
p_sys->i_state = STATE_SEND_DATA;
|
|
break;
|
|
|
|
case STATE_GET_DATA:
|
|
/* Make sure we have enough data.
|
|
* (Not useful if we went through NEXT_SYNC) */
|
|
if( block_WaitBytes( &p_sys->bytestream, p_sys->i_frame_size ) )
|
|
{
|
|
/* Need more data */
|
|
return NULL;
|
|
}
|
|
p_sys->i_state = STATE_SEND_DATA;
|
|
|
|
case STATE_SEND_DATA:
|
|
/* When we reach this point we already know we have enough
|
|
* data available. */
|
|
p_out_buffer = block_New( p_dec, p_sys->i_frame_size );
|
|
if( !p_out_buffer )
|
|
return NULL;
|
|
|
|
/* Copy the whole frame into the buffer */
|
|
block_GetBytes( &p_sys->bytestream,
|
|
p_out_buffer->p_buffer, p_out_buffer->i_buffer );
|
|
|
|
/* Just ignore (E)AC3 frames */
|
|
if( SyncInfoDolby( p_out_buffer->p_buffer ) > 0 )
|
|
{
|
|
block_Release( p_out_buffer );
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
break;
|
|
}
|
|
|
|
/* Setup output */
|
|
if( p_dec->fmt_out.audio.i_rate != p_sys->mlp.i_rate )
|
|
{
|
|
msg_Info( p_dec, "MLP channels: %d samplerate: %d",
|
|
p_sys->mlp.i_channels, p_sys->mlp.i_rate );
|
|
|
|
const mtime_t i_end_date = date_Get( &p_sys->end_date );
|
|
date_Init( &p_sys->end_date, p_sys->mlp.i_rate, 1 );
|
|
date_Set( &p_sys->end_date, i_end_date );
|
|
}
|
|
|
|
p_dec->fmt_out.audio.i_rate = p_sys->mlp.i_rate;
|
|
p_dec->fmt_out.audio.i_channels = p_sys->mlp.i_channels;
|
|
p_dec->fmt_out.audio.i_original_channels = p_sys->mlp.i_channels_conf;
|
|
p_dec->fmt_out.audio.i_physical_channels = p_sys->mlp.i_channels_conf & AOUT_CHAN_PHYSMASK;
|
|
|
|
p_out_buffer->i_pts = p_out_buffer->i_dts = date_Get( &p_sys->end_date );
|
|
|
|
p_out_buffer->i_length =
|
|
date_Increment( &p_sys->end_date, p_sys->mlp.i_samples ) - p_out_buffer->i_pts;
|
|
|
|
/* Make sure we don't reuse the same pts twice */
|
|
if( p_sys->i_pts == p_sys->bytestream.p_block->i_pts )
|
|
p_sys->i_pts = p_sys->bytestream.p_block->i_pts = VLC_TS_INVALID;
|
|
|
|
/* So p_block doesn't get re-added several times */
|
|
*pp_block = block_BytestreamPop( &p_sys->bytestream );
|
|
|
|
p_sys->i_state = STATE_NOSYNC;
|
|
|
|
return p_out_buffer;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Close:
|
|
*****************************************************************************/
|
|
static void Close( vlc_object_t *p_this )
|
|
{
|
|
decoder_t *p_dec = (decoder_t*)p_this;
|
|
decoder_sys_t *p_sys = p_dec->p_sys;
|
|
|
|
block_BytestreamRelease( &p_sys->bytestream );
|
|
|
|
free( p_sys );
|
|
}
|
|
|
|
/**
|
|
* It parse MLP sync info.
|
|
*
|
|
* TODO handle CRC (at offset 26)
|
|
*/
|
|
|
|
static int TrueHdChannels( int i_map )
|
|
{
|
|
static const uint8_t pu_thd[13] =
|
|
{
|
|
2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1
|
|
};
|
|
int i_count = 0;
|
|
|
|
for( int i = 0; i < 13; i++ )
|
|
{
|
|
if( i_map & (1<<i) )
|
|
i_count += pu_thd[i];
|
|
}
|
|
return i_count;
|
|
}
|
|
|
|
static int MlpParse( mlp_header_t *p_mlp, const uint8_t p_hdr[MLP_HEADER_SYNC] )
|
|
{
|
|
bs_t s;
|
|
|
|
assert( !memcmp( p_hdr, pu_start_code, 3 ) );
|
|
|
|
/* TODO Checksum ? */
|
|
|
|
/* */
|
|
bs_init( &s, &p_hdr[3], MLP_HEADER_SYNC - 3 );
|
|
|
|
/* Stream type */
|
|
p_mlp->i_type = bs_read( &s, 8 );
|
|
int i_rate_idx1;
|
|
|
|
if( p_mlp->i_type == 0xbb ) /* MLP */
|
|
{
|
|
static const unsigned pu_channels[32] = {
|
|
1, 2, 3, 4, 3, 4, 5, 3, 4, 5, 4, 5, 6, 4, 5, 4,
|
|
5, 6, 5, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
};
|
|
|
|
bs_skip( &s, 4 + 4 );
|
|
|
|
i_rate_idx1 = bs_read( &s, 4 );
|
|
|
|
// Just skip the 4 following, since we don't use it
|
|
// const int i_rate_idx2 = bs_read( &s, 4 );
|
|
bs_skip( &s, 4 );
|
|
|
|
bs_skip( &s, 11 );
|
|
|
|
const int i_channel_idx = bs_read( &s, 5 );
|
|
p_mlp->i_channels = pu_channels[i_channel_idx];
|
|
}
|
|
else if( p_mlp->i_type == 0xba ) /* True HD */
|
|
{
|
|
i_rate_idx1 = bs_read( &s, 4 );
|
|
|
|
bs_skip( &s, 8 );
|
|
|
|
const int i_channel1 = bs_read( &s, 5 );
|
|
|
|
bs_skip( &s, 2 );
|
|
|
|
const int i_channel2 = bs_read( &s, 13 );
|
|
if( i_channel2 )
|
|
p_mlp->i_channels = TrueHdChannels( i_channel2 );
|
|
else
|
|
p_mlp->i_channels = TrueHdChannels( i_channel1 );
|
|
}
|
|
else
|
|
{
|
|
return VLC_EGENERIC;
|
|
}
|
|
|
|
if( i_rate_idx1 == 0x0f )
|
|
p_mlp->i_rate = 0;
|
|
else
|
|
p_mlp->i_rate = ( ( i_rate_idx1 & 0x8 ) ? 44100 : 48000 ) << (i_rate_idx1 & 0x7);
|
|
p_mlp->i_channels_conf = 0; /* TODO ? */
|
|
|
|
p_mlp->i_samples = 40 << ( i_rate_idx1 & 0x07 );
|
|
|
|
bs_skip( &s, 48 );
|
|
|
|
p_mlp->b_vbr = bs_read( &s, 1 );
|
|
p_mlp->i_bitrate = ( bs_read( &s, 15 ) * p_mlp->i_rate + 8) / 16;
|
|
|
|
p_mlp->i_substreams = bs_read( &s, 4 );
|
|
bs_skip( &s, 4 + 11 * 8 );
|
|
|
|
//fprintf( stderr, "i_samples = %d channels:%d rate:%d bitsrate=%d substreams=%d\n",
|
|
// p_mlp->i_samples, p_mlp->i_channels, p_mlp->i_rate, p_mlp->i_bitrate, p_mlp->i_substreams );
|
|
return VLC_SUCCESS;
|
|
}
|
|
|
|
static int SyncInfo( const uint8_t *p_hdr, bool *pb_mlp, mlp_header_t *p_mlp )
|
|
{
|
|
/* Check major sync presence */
|
|
const bool b_has_sync = !memcmp( &p_hdr[4], pu_start_code, 3 );
|
|
|
|
/* Wait for a major sync */
|
|
if( !b_has_sync && !*pb_mlp )
|
|
return 0;
|
|
|
|
/* Parse major sync if present */
|
|
if( b_has_sync )
|
|
{
|
|
*pb_mlp = !MlpParse( p_mlp, &p_hdr[4] );
|
|
|
|
if( !*pb_mlp )
|
|
return 0;
|
|
}
|
|
|
|
/* Check parity TODO even with major sync */
|
|
if( 1 )
|
|
{
|
|
int i_tmp = 0 ^ p_hdr[0] ^ p_hdr[1] ^ p_hdr[2] ^ p_hdr[3];
|
|
const uint8_t *p = &p_hdr[4 + ( b_has_sync ? 28 : 0 )];
|
|
|
|
for( unsigned i = 0; i < p_mlp->i_substreams; i++ )
|
|
{
|
|
i_tmp ^= *p++;
|
|
i_tmp ^= *p++;
|
|
if( p[-2] & 0x80 )
|
|
{
|
|
i_tmp ^= *p++;
|
|
i_tmp ^= *p++;
|
|
}
|
|
}
|
|
i_tmp = ( i_tmp >> 4 ) ^ i_tmp;
|
|
|
|
if( ( i_tmp & 0x0f ) != 0x0f )
|
|
return 0;
|
|
}
|
|
|
|
/* */
|
|
const int i_word = ( ( p_hdr[0] << 8 ) | p_hdr[1] ) & 0xfff;
|
|
return i_word * 2;
|
|
}
|
|
|
|
/**
|
|
* It returns the size of an AC3 frame (or 0 if invalid)
|
|
*/
|
|
static int GetAc3Size( const uint8_t *p_buf )
|
|
{
|
|
static const int pi_rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
|
|
128, 160, 192, 224, 256, 320, 384, 448,
|
|
512, 576, 640 };
|
|
/* */
|
|
const int i_frmsizecod = p_buf[4] & 63;
|
|
if( i_frmsizecod >= 38 )
|
|
return 0;
|
|
|
|
const int bitrate = pi_rate[i_frmsizecod >> 1];
|
|
|
|
switch( p_buf[4] & 0xc0 )
|
|
{
|
|
case 0:
|
|
return 4 * bitrate;
|
|
case 0x40:
|
|
return 2 * (320 * bitrate / 147 + (i_frmsizecod & 1));
|
|
case 0x80:
|
|
return 6 * bitrate;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* It return the size of a EAC3 frame (or 0 if invalid)
|
|
*/
|
|
static int GetEac3Size( const uint8_t *p_buf )
|
|
{
|
|
int i_frame_size;
|
|
int i_bytes;
|
|
|
|
i_frame_size = ( ( p_buf[2] << 8 ) | p_buf[3] ) & 0x7ff;
|
|
if( i_frame_size < 2 )
|
|
return 0;
|
|
i_bytes = 2 * ( i_frame_size + 1 );
|
|
|
|
return i_bytes;
|
|
}
|
|
|
|
/**
|
|
* It returns the size of an AC3/EAC3 frame (or 0 if invalid)
|
|
*/
|
|
static int SyncInfoDolby( const uint8_t *p_buf )
|
|
{
|
|
int bsid;
|
|
|
|
/* Check synword */
|
|
if( p_buf[0] != 0x0b || p_buf[1] != 0x77 )
|
|
return 0;
|
|
|
|
/* Check bsid */
|
|
bsid = p_buf[5] >> 3;
|
|
if( bsid > 16 )
|
|
return 0;
|
|
|
|
if( bsid <= 10 )
|
|
return GetAc3Size( p_buf );
|
|
else
|
|
return GetEac3Size( p_buf );
|
|
}
|
|
|
|
|