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/*****************************************************************************
* spudec.c : SPU decoder thread
*****************************************************************************
* Copyright (C) 2000-2001, 2006 the VideoLAN team
* $Id: f527a9c2b379c0ed5fc6cc6ff48cc353859719ef $
*
* Authors: Sam Hocevar <sam@zoy.org>
* Laurent Aimar <fenrir@via.ecp.fr>
*
* 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 "spudec.h"
/*****************************************************************************
* Module descriptor.
*****************************************************************************/
static int DecoderOpen ( vlc_object_t * );
static int PacketizerOpen( vlc_object_t * );
static void Close ( vlc_object_t * );
vlc_module_begin ()
set_description( N_("DVD subtitles decoder") )
set_capability( "decoder", 50 )
set_category( CAT_INPUT )
set_subcategory( SUBCAT_INPUT_SCODEC )
set_callbacks( DecoderOpen, Close )
add_submodule ()
set_description( N_("DVD subtitles packetizer") )
set_capability( "packetizer", 50 )
set_callbacks( PacketizerOpen, Close )
vlc_module_end ()
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static block_t * Reassemble( decoder_t *, block_t ** );
static subpicture_t * Decode ( decoder_t *, block_t ** );
static block_t * Packetize ( decoder_t *, block_t ** );
/*****************************************************************************
* DecoderOpen
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to chose.
*****************************************************************************/
static int DecoderOpen( 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( 's','p','u',' ' ) &&
p_dec->fmt_in.i_codec != VLC_FOURCC( 's','p','u','b' ) )
{
return VLC_EGENERIC;
}
p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
p_sys->b_packetizer = false;
p_sys->i_spu_size = 0;
p_sys->i_spu = 0;
p_sys->p_block = NULL;
es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 's','p','u',' ' ) );
p_dec->pf_decode_sub = Decode;
p_dec->pf_packetize = NULL;
return VLC_SUCCESS;
}
/*****************************************************************************
* PacketizerOpen
*****************************************************************************
* Tries to launch a decoder and return score so that the interface is able
* to chose.
*****************************************************************************/
static int PacketizerOpen( vlc_object_t *p_this )
{
decoder_t *p_dec = (decoder_t*)p_this;
if( DecoderOpen( p_this ) )
{
return VLC_EGENERIC;
}
p_dec->pf_packetize = Packetize;
p_dec->p_sys->b_packetizer = true;
es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
p_dec->fmt_out.i_codec = VLC_FOURCC( 's','p','u',' ' );
return VLC_SUCCESS;
}
/*****************************************************************************
* 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;
if( p_sys->p_block )
{
block_ChainRelease( p_sys->p_block );
}
free( p_sys );
}
/*****************************************************************************
* Decode:
*****************************************************************************/
static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_spu_block;
subpicture_t *p_spu;
p_spu_block = Reassemble( p_dec, pp_block );
if( ! p_spu_block )
{
return NULL;
}
/* FIXME: what the, we shouldn’t need to allocate 64k of buffer --sam. */
p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
p_sys->i_pts = p_spu_block->i_pts;
block_ChainRelease( p_spu_block );
/* Parse and decode */
p_spu = ParsePacket( p_dec );
/* reinit context */
p_sys->i_spu_size = 0;
p_sys->i_rle_size = 0;
p_sys->i_spu = 0;
p_sys->p_block = NULL;
return p_spu;
}
/*****************************************************************************
* Packetize:
*****************************************************************************/
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_spu = Reassemble( p_dec, pp_block );
if( ! p_spu )
{
return NULL;
}
p_spu->i_dts = p_spu->i_pts;
p_spu->i_length = 0;
/* reinit context */
p_sys->i_spu_size = 0;
p_sys->i_rle_size = 0;
p_sys->i_spu = 0;
p_sys->p_block = NULL;
return block_ChainGather( p_spu );
}
/*****************************************************************************
* Reassemble:
*****************************************************************************/
static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
{
decoder_sys_t *p_sys = p_dec->p_sys;
block_t *p_block;
if( pp_block == NULL || *pp_block == NULL ) return NULL;
p_block = *pp_block;
*pp_block = NULL;
if( p_sys->i_spu_size <= 0 &&
( p_block->i_pts <= 0 || p_block->i_buffer < 4 ) )
{
msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
msg_Dbg( p_dec, "spu size: %d, i_pts: %"PRId64" i_buffer: %zu",
p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
block_Release( p_block );
return NULL;
}
block_ChainAppend( &p_sys->p_block, p_block );
p_sys->i_spu += p_block->i_buffer;
if( p_sys->i_spu_size <= 0 )
{
p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
p_block->p_buffer[1];
p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
p_block->p_buffer[3] ) - 4;
/* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
p_sys->i_spu_size, p_sys->i_rle_size ); */
if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
{
p_sys->i_spu_size = 0;
p_sys->i_rle_size = 0;
p_sys->i_spu = 0;
p_sys->p_block = NULL;
block_Release( p_block );
return NULL;
}
}
if( p_sys->i_spu >= p_sys->i_spu_size )
{
/* We have a complete sub */
if( p_sys->i_spu > p_sys->i_spu_size )
msg_Dbg( p_dec, "SPU packets size=%d should be %d",
p_sys->i_spu, p_sys->i_spu_size );
return p_sys->p_block;
}
return NULL;
}
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