Commit be372190 authored by Laurent Aimar's avatar Laurent Aimar

Added MLP packetizer with TrueHD support (AC3 frame removed).

parent bb4404e1
......@@ -4,13 +4,15 @@ SOURCES_packetizer_mpeg4video = mpeg4video.c
SOURCES_packetizer_mpeg4audio = mpeg4audio.c
SOURCES_packetizer_h264 = h264.c
SOURCES_packetizer_vc1 = vc1.c
SOURCES_packetizer_mlp = mlp.c
libvlc_LTLIBRARIES += \
libpacketizer_mpegvideo_plugin.la \
libpacketizer_mpeg4video_plugin.la \
libpacketizer_mpeg4audio_plugin.la \
libpacketizer_h264_plugin.la \
libpacketizer_vc1_plugin.la
libpacketizer_vc1_plugin.la \
libpacketizer_mlp_plugin.la
if ENABLE_SOUT
libvlc_LTLIBRARIES += libpacketizer_copy_plugin.la
endif
/*****************************************************************************
* 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>
/*****************************************************************************
* 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;
int i_rate;
int i_channels;
int i_channels_conf;
int i_samples;
bool b_vbr;
int i_bitrate;
int i_substreams;
} mlp_header_t;
struct decoder_sys_t
{
/*
* Input properties
*/
int i_state;
block_bytestream_t bytestream;
/*
* Common properties
*/
audio_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_FOURCC('m','l','p',' ') )
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;
aout_DateSet( &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 = VLC_FOURCC('m','l','p',' ');
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_BytestreamFlush( &p_sys->bytestream );
}
block_Release( *pp_block );
return NULL;
}
if( !aout_DateGet( &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 != 0 &&
p_sys->i_pts != aout_DateGet( &p_sys->end_date ) )
{
aout_DateSet( &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)" );
fprintf( stderr,"\n" );
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 );
aout_DateInit( &p_sys->end_date, p_sys->mlp.i_rate );
aout_DateSet( &p_sys->end_date, p_sys->i_pts );
}
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 = aout_DateGet( &p_sys->end_date );
p_out_buffer->i_length =
aout_DateIncrement( &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 = 0;
/* 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 );
const int i_rate_idx2 = bs_read( &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( int 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 );
}
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