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255 lines
8.2 KiB
255 lines
8.2 KiB
/*****************************************************************************
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* spudec.c : SPU decoder thread
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*****************************************************************************
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* Copyright (C) 2000-2001, 2006 the VideoLAN team
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* $Id$
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*
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* Authors: Sam Hocevar <sam@zoy.org>
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* Laurent Aimar <fenrir@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include "spudec.h"
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/*****************************************************************************
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* Module descriptor.
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*****************************************************************************/
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static int DecoderOpen ( vlc_object_t * );
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static int PacketizerOpen( vlc_object_t * );
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static void Close ( vlc_object_t * );
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#define DVDSUBTRANS_DISABLE_TEXT N_("Disable DVD subtitle transparency")
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#define DVDSUBTRANS_DISABLE_LONGTEXT N_("Removes all transparency effects " \
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"used in DVD subtitles.")
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vlc_module_begin ()
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set_description( N_("DVD subtitles decoder") )
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set_shortname( N_("DVD subtitles") )
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set_capability( "decoder", 50 )
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set_category( CAT_INPUT )
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set_subcategory( SUBCAT_INPUT_SCODEC )
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set_callbacks( DecoderOpen, Close )
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add_bool( "dvdsub-transparency", false, NULL,
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DVDSUBTRANS_DISABLE_TEXT, DVDSUBTRANS_DISABLE_LONGTEXT, true )
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add_submodule ()
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set_description( N_("DVD subtitles packetizer") )
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set_capability( "packetizer", 50 )
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set_callbacks( PacketizerOpen, Close )
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vlc_module_end ()
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static block_t * Reassemble( decoder_t *, block_t ** );
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static subpicture_t * Decode ( decoder_t *, block_t ** );
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static block_t * Packetize ( decoder_t *, block_t ** );
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/*****************************************************************************
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* DecoderOpen
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*****************************************************************************
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* Tries to launch a decoder and return score so that the interface is able
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* to chose.
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*****************************************************************************/
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static int DecoderOpen( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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decoder_sys_t *p_sys;
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if( p_dec->fmt_in.i_codec != VLC_CODEC_SPU )
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return VLC_EGENERIC;
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p_dec->p_sys = p_sys = malloc( sizeof( decoder_sys_t ) );
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p_sys->b_packetizer = false;
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p_sys->b_disabletrans = var_InheritBool( p_dec, "dvdsub-transparency" );
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p_sys->i_spu_size = 0;
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p_sys->i_spu = 0;
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p_sys->p_block = NULL;
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es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_CODEC_SPU );
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p_dec->pf_decode_sub = Decode;
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p_dec->pf_packetize = NULL;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* PacketizerOpen
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*****************************************************************************
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* Tries to launch a decoder and return score so that the interface is able
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* to chose.
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*****************************************************************************/
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static int PacketizerOpen( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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if( DecoderOpen( p_this ) )
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{
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return VLC_EGENERIC;
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}
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p_dec->pf_packetize = Packetize;
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p_dec->p_sys->b_packetizer = true;
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es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
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p_dec->fmt_out.i_codec = VLC_CODEC_SPU;
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Close:
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*****************************************************************************/
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static void Close( vlc_object_t *p_this )
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{
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decoder_t *p_dec = (decoder_t*)p_this;
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decoder_sys_t *p_sys = p_dec->p_sys;
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if( p_sys->p_block )
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{
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block_ChainRelease( p_sys->p_block );
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}
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free( p_sys );
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}
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/*****************************************************************************
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* Decode:
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*****************************************************************************/
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static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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block_t *p_spu_block;
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subpicture_t *p_spu;
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p_spu_block = Reassemble( p_dec, pp_block );
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if( ! p_spu_block )
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{
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return NULL;
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}
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/* FIXME: what the, we shouldn’t need to allocate 64k of buffer --sam. */
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p_sys->i_spu = block_ChainExtract( p_spu_block, p_sys->buffer, 65536 );
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p_sys->i_pts = p_spu_block->i_pts;
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block_ChainRelease( p_spu_block );
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/* Parse and decode */
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p_spu = ParsePacket( p_dec );
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/* reinit context */
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p_sys->i_spu_size = 0;
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p_sys->i_rle_size = 0;
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p_sys->i_spu = 0;
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p_sys->p_block = NULL;
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return p_spu;
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}
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/*****************************************************************************
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* Packetize:
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*****************************************************************************/
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static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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block_t *p_spu = Reassemble( p_dec, pp_block );
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if( ! p_spu )
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{
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return NULL;
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}
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p_spu->i_dts = p_spu->i_pts;
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p_spu->i_length = 0;
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/* reinit context */
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p_sys->i_spu_size = 0;
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p_sys->i_rle_size = 0;
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p_sys->i_spu = 0;
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p_sys->p_block = NULL;
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return block_ChainGather( p_spu );
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}
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/*****************************************************************************
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* Reassemble:
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*****************************************************************************/
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static block_t *Reassemble( decoder_t *p_dec, block_t **pp_block )
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{
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decoder_sys_t *p_sys = p_dec->p_sys;
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block_t *p_block;
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if( pp_block == NULL || *pp_block == NULL ) return NULL;
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p_block = *pp_block;
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*pp_block = NULL;
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if( p_sys->i_spu_size <= 0 &&
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( p_block->i_pts <= VLC_TS_INVALID || p_block->i_buffer < 4 ) )
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{
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msg_Dbg( p_dec, "invalid starting packet (size < 4 or pts <=0)" );
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msg_Dbg( p_dec, "spu size: %d, i_pts: %"PRId64" i_buffer: %zu",
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p_sys->i_spu_size, p_block->i_pts, p_block->i_buffer );
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block_Release( p_block );
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return NULL;
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}
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block_ChainAppend( &p_sys->p_block, p_block );
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p_sys->i_spu += p_block->i_buffer;
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if( p_sys->i_spu_size <= 0 )
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{
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p_sys->i_spu_size = ( p_block->p_buffer[0] << 8 )|
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p_block->p_buffer[1];
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p_sys->i_rle_size = ( ( p_block->p_buffer[2] << 8 )|
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p_block->p_buffer[3] ) - 4;
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/* msg_Dbg( p_dec, "i_spu_size=%d i_rle=%d",
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p_sys->i_spu_size, p_sys->i_rle_size ); */
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if( p_sys->i_spu_size <= 0 || p_sys->i_rle_size >= p_sys->i_spu_size )
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{
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p_sys->i_spu_size = 0;
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p_sys->i_rle_size = 0;
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p_sys->i_spu = 0;
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p_sys->p_block = NULL;
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block_Release( p_block );
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return NULL;
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}
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}
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if( p_sys->i_spu >= p_sys->i_spu_size )
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{
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/* We have a complete sub */
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if( p_sys->i_spu > p_sys->i_spu_size )
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msg_Dbg( p_dec, "SPU packets size=%d should be %d",
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p_sys->i_spu, p_sys->i_spu_size );
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return p_sys->p_block;
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}
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return NULL;
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}
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