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678 lines
22 KiB
678 lines
22 KiB
/*****************************************************************************
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* parse.c: SPU parser
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*****************************************************************************
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* Copyright (C) 2000-2001 VideoLAN
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* $Id: parse.c,v 1.1 2002/08/16 03:07:56 sam Exp $
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*
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* Authors: Samuel Hocevar <sam@zoy.org>
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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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* malloc(), free() */
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#include <string.h> /* memcpy(), memset() */
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#include <vlc/vlc.h>
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#include <vlc/vout.h>
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#include <vlc/decoder.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h> /* getpid() */
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#endif
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#ifdef WIN32 /* getpid() for win32 is located in process.h */
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# include <process.h>
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#endif
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#include "spudec.h"
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/*****************************************************************************
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* Local prototypes.
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*****************************************************************************/
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static int ParseControlSequences( spudec_thread_t *, subpicture_t * );
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static int ParseRLE ( spudec_thread_t *, subpicture_t *, u8 * );
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/*****************************************************************************
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* AddNibble: read a nibble from a source packet and add it to our integer.
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*****************************************************************************/
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static inline unsigned int AddNibble( unsigned int i_code,
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u8 *p_src, int *pi_index )
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{
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if( *pi_index & 0x1 )
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{
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return( i_code << 4 | ( p_src[(*pi_index)++ >> 1] & 0xf ) );
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}
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else
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{
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return( i_code << 4 | p_src[(*pi_index)++ >> 1] >> 4 );
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}
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}
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/*****************************************************************************
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* SyncPacket: get in sync with the stream
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*****************************************************************************
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* This function makes a few sanity checks and returns 0 if it looks like we
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* are at the beginning of a subpicture packet.
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*****************************************************************************/
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int E_(SyncPacket)( spudec_thread_t *p_spudec )
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{
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/* Re-align the buffer on an 8-bit boundary */
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RealignBits( &p_spudec->bit_stream );
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/* The total SPU packet size, often bigger than a PS packet */
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p_spudec->i_spu_size = GetBits( &p_spudec->bit_stream, 16 );
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/* The RLE stuff size (remove 4 because we just read 32 bits) */
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p_spudec->i_rle_size = ShowBits( &p_spudec->bit_stream, 16 ) - 4;
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/* If the values we got are a bit strange, skip packet */
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if( !p_spudec->i_spu_size
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|| ( p_spudec->i_rle_size >= p_spudec->i_spu_size ) )
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{
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return( 1 );
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}
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RemoveBits( &p_spudec->bit_stream, 16 );
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return( 0 );
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}
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/*****************************************************************************
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* ParsePacket: parse an SPU packet and send it to the video output
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*****************************************************************************
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* This function parses the SPU packet and, if valid, sends it to the
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* video output.
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*****************************************************************************/
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void E_(ParsePacket)( spudec_thread_t *p_spudec )
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{
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subpicture_t * p_spu;
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u8 * p_src;
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unsigned int i_offset;
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msg_Dbg( p_spudec->p_fifo, "trying to gather a 0x%.2x long subtitle",
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p_spudec->i_spu_size );
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/* We cannot display a subpicture with no date */
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if( p_spudec->p_fifo->p_first->i_pts == 0 )
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{
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msg_Warn( p_spudec->p_fifo, "subtitle without a date" );
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return;
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}
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/* Allocate the subpicture internal data. */
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p_spu = vout_CreateSubPicture( p_spudec->p_vout, MEMORY_SUBPICTURE,
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sizeof( subpicture_sys_t )
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+ p_spudec->i_rle_size * 4 );
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/* Rationale for the "p_spudec->i_rle_size * 4": we are going to
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* expand the RLE stuff so that we won't need to read nibbles later
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* on. This will speed things up a lot. Plus, we'll only need to do
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* this stupid interlacing stuff once. */
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if( p_spu == NULL )
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{
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return;
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}
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/* Fill the p_spu structure */
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p_spu->pf_render = E_(RenderSPU);
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p_spu->p_sys->p_data = (u8*)p_spu->p_sys + sizeof( subpicture_sys_t );
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p_spu->p_sys->b_palette = 0;
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/* Get display time now. If we do it later, we may miss the PTS. */
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p_spu->p_sys->i_pts = p_spudec->p_fifo->p_first->i_pts;
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/* Allocate the temporary buffer we will parse */
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p_src = malloc( p_spudec->i_rle_size );
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if( p_src == NULL )
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{
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msg_Err( p_spudec->p_fifo, "out of memory" );
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vout_DestroySubPicture( p_spudec->p_vout, p_spu );
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return;
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}
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/* Get RLE data */
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for( i_offset = 0; i_offset < p_spudec->i_rle_size;
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i_offset += SPU_CHUNK_SIZE )
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{
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GetChunk( &p_spudec->bit_stream, p_src + i_offset,
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( i_offset + SPU_CHUNK_SIZE < p_spudec->i_rle_size ) ?
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SPU_CHUNK_SIZE : p_spudec->i_rle_size - i_offset );
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/* Abort subtitle parsing if we were requested to stop */
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if( p_spudec->p_fifo->b_die )
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{
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free( p_src );
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vout_DestroySubPicture( p_spudec->p_vout, p_spu );
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return;
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}
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}
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#if 0
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/* Dump the subtitle info */
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intf_WarnHexDump( 5, p_spu->p_sys->p_data, p_spudec->i_rle_size );
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#endif
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/* Getting the control part */
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if( ParseControlSequences( p_spudec, p_spu ) )
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{
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/* There was a parse error, delete the subpicture */
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free( p_src );
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vout_DestroySubPicture( p_spudec->p_vout, p_spu );
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return;
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}
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/* At this point, no more GetBit() command is needed, so we have all
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* the data we need to tell whether the subtitle is valid. Thus we
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* try to display it and we ignore b_die. */
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if( ParseRLE( p_spudec, p_spu, p_src ) )
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{
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/* There was a parse error, delete the subpicture */
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free( p_src );
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vout_DestroySubPicture( p_spudec->p_vout, p_spu );
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return;
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}
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msg_Dbg( p_spudec->p_fifo, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
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p_spudec->i_spu_size,
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p_spu->p_sys->pi_offset[0], p_spu->p_sys->pi_offset[1] );
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/* SPU is finished - we can ask the video output to display it */
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vout_DisplaySubPicture( p_spudec->p_vout, p_spu );
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/* Clean up */
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free( p_src );
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}
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/*****************************************************************************
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* ParseControlSequences: parse all SPU control sequences
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*****************************************************************************
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* This is the most important part in SPU decoding. We get dates, palette
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* information, coordinates, and so on. For more information on the
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* subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
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*****************************************************************************/
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static int ParseControlSequences( spudec_thread_t *p_spudec,
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subpicture_t * p_spu )
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{
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/* Our current index in the SPU packet */
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int i_index = p_spudec->i_rle_size + 4;
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/* The next start-of-control-sequence index and the previous one */
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int i_next_seq, i_cur_seq;
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/* Command time and date */
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u8 i_command;
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int i_date;
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int i, pi_alpha[4];
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/* XXX: temporary variables */
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vlc_bool_t b_force_display = 0;
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/* Initialize the structure */
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p_spu->i_start = p_spu->i_stop = 0;
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p_spu->b_ephemer = 0;
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do
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{
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/* Get the control sequence date */
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i_date = GetBits( &p_spudec->bit_stream, 16 );
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/* Next offset */
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i_cur_seq = i_index;
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i_next_seq = GetBits( &p_spudec->bit_stream, 16 );
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/* Skip what we just read */
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i_index += 4;
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do
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{
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i_command = GetBits( &p_spudec->bit_stream, 8 );
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i_index++;
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switch( i_command )
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{
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case SPU_CMD_FORCE_DISPLAY:
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/* 00 (force displaying) */
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p_spu->i_start = p_spu->p_sys->i_pts + ( i_date * 11000 );
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b_force_display = 1;
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break;
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/* Convert the dates in seconds to PTS values */
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case SPU_CMD_START_DISPLAY:
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/* 01 (start displaying) */
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p_spu->i_start = p_spu->p_sys->i_pts + ( i_date * 11000 );
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break;
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case SPU_CMD_STOP_DISPLAY:
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/* 02 (stop displaying) */
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p_spu->i_stop = p_spu->p_sys->i_pts + ( i_date * 11000 );
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break;
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case SPU_CMD_SET_PALETTE:
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/* 03xxxx (palette) */
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if( p_spudec->p_fifo->p_demux_data &&
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*(int*)p_spudec->p_fifo->p_demux_data == 0xBeeF )
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{
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u32 i_color;
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p_spu->p_sys->b_palette = 1;
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for( i = 0; i < 4 ; i++ )
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{
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i_color = ((u32*)((char*)p_spudec->p_fifo->
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p_demux_data + sizeof(int)))[
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GetBits(&p_spudec->bit_stream, 4) ];
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/* FIXME: this job should be done sooner */
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#ifndef WORDS_BIGENDIAN
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p_spu->p_sys->pi_yuv[3-i][0] = (i_color>>16) & 0xff;
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p_spu->p_sys->pi_yuv[3-i][1] = (i_color>>0) & 0xff;
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p_spu->p_sys->pi_yuv[3-i][2] = (i_color>>8) & 0xff;
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#else
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p_spu->p_sys->pi_yuv[3-i][0] = (i_color>>8) & 0xff;
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p_spu->p_sys->pi_yuv[3-i][1] = (i_color>>24) & 0xff;
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p_spu->p_sys->pi_yuv[3-i][2] = (i_color>>16) & 0xff;
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#endif
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}
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}
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else
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{
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RemoveBits( &p_spudec->bit_stream, 16 );
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}
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i_index += 2;
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break;
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case SPU_CMD_SET_ALPHACHANNEL:
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/* 04xxxx (alpha channel) */
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pi_alpha[3] = GetBits( &p_spudec->bit_stream, 4 );
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pi_alpha[2] = GetBits( &p_spudec->bit_stream, 4 );
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pi_alpha[1] = GetBits( &p_spudec->bit_stream, 4 );
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pi_alpha[0] = GetBits( &p_spudec->bit_stream, 4 );
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/* Ignore blank alpha palette. Sometimes spurious blank
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* alpha palettes are present - dunno why. */
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if( pi_alpha[0] | pi_alpha[1] | pi_alpha[2] | pi_alpha[3] )
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{
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p_spu->p_sys->pi_alpha[0] = pi_alpha[0];
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p_spu->p_sys->pi_alpha[1] = pi_alpha[1];
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p_spu->p_sys->pi_alpha[2] = pi_alpha[2];
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p_spu->p_sys->pi_alpha[3] = pi_alpha[3];
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}
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else
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{
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msg_Warn( p_spudec->p_fifo,
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"ignoring blank alpha palette" );
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}
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i_index += 2;
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break;
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case SPU_CMD_SET_COORDINATES:
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/* 05xxxyyyxxxyyy (coordinates) */
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p_spu->i_x = GetBits( &p_spudec->bit_stream, 12 );
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p_spu->i_width = GetBits( &p_spudec->bit_stream, 12 )
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- p_spu->i_x + 1;
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p_spu->i_y = GetBits( &p_spudec->bit_stream, 12 );
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p_spu->i_height = GetBits( &p_spudec->bit_stream, 12 )
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- p_spu->i_y + 1;
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i_index += 6;
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break;
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case SPU_CMD_SET_OFFSETS:
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/* 06xxxxyyyy (byte offsets) */
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p_spu->p_sys->pi_offset[0] =
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GetBits( &p_spudec->bit_stream, 16 ) - 4;
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p_spu->p_sys->pi_offset[1] =
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GetBits( &p_spudec->bit_stream, 16 ) - 4;
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i_index += 4;
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break;
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case SPU_CMD_END:
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/* ff (end) */
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break;
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default:
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/* xx (unknown command) */
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msg_Err( p_spudec->p_fifo, "unknown command 0x%.2x",
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i_command );
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return( 1 );
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}
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/* We need to check for quit commands here */
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if( p_spudec->p_fifo->b_die )
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{
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return( 1 );
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}
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} while( i_command != SPU_CMD_END );
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} while( i_index == i_next_seq );
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/* Check that the next sequence index matches the current one */
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if( i_next_seq != i_cur_seq )
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{
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msg_Err( p_spudec->p_fifo, "index mismatch (0x%.4x != 0x%.4x)",
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i_next_seq, i_cur_seq );
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return( 1 );
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}
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if( i_index > p_spudec->i_spu_size )
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{
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msg_Err( p_spudec->p_fifo, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
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i_index, p_spudec->i_spu_size );
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return( 1 );
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}
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if( !p_spu->i_start )
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{
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msg_Err( p_spudec->p_fifo, "no `start display' command" );
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}
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if( !p_spu->i_stop )
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{
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/* This subtitle will live for 5 seconds or until the next subtitle */
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p_spu->i_stop = p_spu->i_start + 500 * 11000;
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p_spu->b_ephemer = 1;
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}
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/* Get rid of padding bytes */
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switch( p_spudec->i_spu_size - i_index )
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{
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/* Zero or one padding byte, quite usual */
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case 1:
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RemoveBits( &p_spudec->bit_stream, 8 );
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i_index++;
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case 0:
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break;
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/* More than one padding byte - this is very strange, but
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* we can deal with it */
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default:
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msg_Warn( p_spudec->p_fifo,
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"%i padding bytes, we usually get 0 or 1 of them",
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p_spudec->i_spu_size - i_index );
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while( i_index < p_spudec->i_spu_size )
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{
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RemoveBits( &p_spudec->bit_stream, 8 );
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i_index++;
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}
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break;
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}
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if( b_force_display )
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{
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msg_Err( p_spudec->p_fifo, "\"force display\" command" );
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msg_Err( p_spudec->p_fifo, "send mail to <sam@zoy.org> if you "
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"want to help debugging this" );
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}
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/* Successfully parsed ! */
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return( 0 );
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}
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/*****************************************************************************
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* ParseRLE: parse the RLE part of the subtitle
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*****************************************************************************
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* This part parses the subtitle graphical data and stores it in a more
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* convenient structure for later decoding. For more information on the
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* subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
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*****************************************************************************/
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static int ParseRLE( spudec_thread_t *p_spudec,
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subpicture_t * p_spu, u8 * p_src )
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{
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unsigned int i_code;
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unsigned int i_width = p_spu->i_width;
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unsigned int i_height = p_spu->i_height;
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unsigned int i_x, i_y;
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u16 *p_dest = (u16 *)p_spu->p_sys->p_data;
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/* The subtitles are interlaced, we need two offsets */
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unsigned int i_id = 0; /* Start on the even SPU layer */
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unsigned int pi_table[ 2 ];
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unsigned int *pi_offset;
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vlc_bool_t b_empty_top = 1,
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b_empty_bottom = 0;
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unsigned int i_skipped_top = 0,
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i_skipped_bottom = 0;
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/* Colormap statistics */
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int i_border = -1;
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int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
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pi_table[ 0 ] = p_spu->p_sys->pi_offset[ 0 ] << 1;
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pi_table[ 1 ] = p_spu->p_sys->pi_offset[ 1 ] << 1;
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for( i_y = 0 ; i_y < i_height ; i_y++ )
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{
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pi_offset = pi_table + i_id;
|
|
|
|
for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
|
|
{
|
|
i_code = AddNibble( 0, p_src, pi_offset );
|
|
|
|
if( i_code < 0x04 )
|
|
{
|
|
i_code = AddNibble( i_code, p_src, pi_offset );
|
|
|
|
if( i_code < 0x10 )
|
|
{
|
|
i_code = AddNibble( i_code, p_src, pi_offset );
|
|
|
|
if( i_code < 0x040 )
|
|
{
|
|
i_code = AddNibble( i_code, p_src, pi_offset );
|
|
|
|
if( i_code < 0x0100 )
|
|
{
|
|
/* If the 14 first bits are set to 0, then it's a
|
|
* new line. We emulate it. */
|
|
if( i_code < 0x0004 )
|
|
{
|
|
i_code |= ( i_width - i_x ) << 2;
|
|
}
|
|
else
|
|
{
|
|
/* We have a boo boo ! */
|
|
msg_Err( p_spudec->p_fifo, "unknown RLE code "
|
|
"0x%.4x", i_code );
|
|
return( 1 );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
|
|
{
|
|
msg_Err( p_spudec->p_fifo,
|
|
"out of bounds, %i at (%i,%i) is out of %ix%i",
|
|
i_code >> 2, i_x, i_y, i_width, i_height );
|
|
return( 1 );
|
|
}
|
|
|
|
/* Try to find the border color */
|
|
if( p_spu->p_sys->pi_alpha[ i_code & 0x3 ] != 0x00 )
|
|
{
|
|
i_border = i_code & 0x3;
|
|
stats[i_border] += i_code >> 2;
|
|
}
|
|
|
|
if( (i_code >> 2) == i_width
|
|
&& p_spu->p_sys->pi_alpha[ i_code & 0x3 ] == 0x00 )
|
|
{
|
|
if( b_empty_top )
|
|
{
|
|
/* This is a blank top line, we skip it */
|
|
i_skipped_top++;
|
|
}
|
|
else
|
|
{
|
|
/* We can't be sure the current lines will be skipped,
|
|
* so we store the code just in case. */
|
|
*p_dest++ = i_code;
|
|
|
|
b_empty_bottom = 1;
|
|
i_skipped_bottom++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* We got a valid code, store it */
|
|
*p_dest++ = i_code;
|
|
|
|
/* Valid code means no blank line */
|
|
b_empty_top = 0;
|
|
b_empty_bottom = 0;
|
|
i_skipped_bottom = 0;
|
|
}
|
|
}
|
|
|
|
/* Check that we didn't go too far */
|
|
if( i_x > i_width )
|
|
{
|
|
msg_Err( p_spudec->p_fifo, "i_x overflowed, %i > %i",
|
|
i_x, i_width );
|
|
return( 1 );
|
|
}
|
|
|
|
/* Byte-align the stream */
|
|
if( *pi_offset & 0x1 )
|
|
{
|
|
(*pi_offset)++;
|
|
}
|
|
|
|
/* Swap fields */
|
|
i_id = ~i_id & 0x1;
|
|
}
|
|
|
|
/* We shouldn't get any padding bytes */
|
|
if( i_y < i_height )
|
|
{
|
|
msg_Err( p_spudec->p_fifo, "padding bytes found in RLE sequence" );
|
|
msg_Err( p_spudec->p_fifo, "send mail to <sam@zoy.org> if you "
|
|
"want to help debugging this" );
|
|
|
|
/* Skip them just in case */
|
|
while( i_y < i_height )
|
|
{
|
|
*p_dest++ = i_width << 2;
|
|
i_y++;
|
|
}
|
|
|
|
return( 1 );
|
|
}
|
|
|
|
msg_Dbg( p_spudec->p_fifo, "valid subtitle, size: %ix%i, position: %i,%i",
|
|
p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
|
|
|
|
/* Crop if necessary */
|
|
if( i_skipped_top || i_skipped_bottom )
|
|
{
|
|
p_spu->i_y += i_skipped_top;
|
|
p_spu->i_height -= i_skipped_top + i_skipped_bottom;
|
|
|
|
msg_Dbg( p_spudec->p_fifo, "cropped to: %ix%i, position: %i,%i",
|
|
p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
|
|
}
|
|
|
|
/* Handle color if no palette was found */
|
|
if( !p_spu->p_sys->b_palette )
|
|
{
|
|
int i, i_inner = -1, i_shade = -1;
|
|
|
|
/* Set the border color */
|
|
p_spu->p_sys->pi_yuv[i_border][0] = 0x00;
|
|
p_spu->p_sys->pi_yuv[i_border][1] = 0x80;
|
|
p_spu->p_sys->pi_yuv[i_border][2] = 0x80;
|
|
stats[i_border] = 0;
|
|
|
|
/* Find the inner colors */
|
|
for( i = 0 ; i < 4 && i_inner == -1 ; i++ )
|
|
{
|
|
if( stats[i] )
|
|
{
|
|
i_inner = i;
|
|
}
|
|
}
|
|
|
|
for( ; i < 4 && i_shade == -1 ; i++ )
|
|
{
|
|
if( stats[i] )
|
|
{
|
|
if( stats[i] > stats[i_inner] )
|
|
{
|
|
i_shade = i_inner;
|
|
i_inner = i;
|
|
}
|
|
else
|
|
{
|
|
i_shade = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Set the inner color */
|
|
if( i_inner != -1 )
|
|
{
|
|
p_spu->p_sys->pi_yuv[i_inner][0] = 0xff;
|
|
p_spu->p_sys->pi_yuv[i_inner][1] = 0x80;
|
|
p_spu->p_sys->pi_yuv[i_inner][2] = 0x80;
|
|
}
|
|
|
|
/* Set the anti-aliasing color */
|
|
if( i_shade != -1 )
|
|
{
|
|
p_spu->p_sys->pi_yuv[i_shade][0] = 0x80;
|
|
p_spu->p_sys->pi_yuv[i_shade][1] = 0x80;
|
|
p_spu->p_sys->pi_yuv[i_shade][2] = 0x80;
|
|
}
|
|
|
|
msg_Dbg( p_spudec->p_fifo,
|
|
"using custom palette (border %i, inner %i, shade %i)",
|
|
i_border, i_inner, i_shade );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
|