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702 lines
22 KiB
702 lines
22 KiB
/*****************************************************************************
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* spu_decoder.c : spu decoder thread
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*****************************************************************************
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* Copyright (C) 2000-2001 VideoLAN
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* $Id: spu_decoder.c,v 1.10 2002/02/19 00:50:19 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 <videolan/vlc.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 "video.h"
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#include "video_output.h"
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#include "stream_control.h"
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#include "input_ext-dec.h"
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#include "spu_decoder.h"
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int decoder_Probe ( u8 * );
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static int decoder_Run ( decoder_config_t * );
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static int InitThread ( spudec_thread_t * );
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static void EndThread ( spudec_thread_t * );
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static int SyncPacket ( spudec_thread_t * );
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static void ParsePacket ( spudec_thread_t * );
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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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* Capabilities
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*****************************************************************************/
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void _M( spudec_getfunctions )( function_list_t * p_function_list )
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{
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p_function_list->functions.dec.pf_probe = decoder_Probe;
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p_function_list->functions.dec.pf_run = decoder_Run;
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}
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/*****************************************************************************
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* Build configuration tree.
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*****************************************************************************/
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MODULE_CONFIG_START
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MODULE_CONFIG_STOP
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MODULE_INIT_START
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SET_DESCRIPTION( "DVD subtitles decoder module" )
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ADD_CAPABILITY( DECODER, 50 )
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MODULE_INIT_STOP
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MODULE_ACTIVATE_START
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_M( spudec_getfunctions )( &p_module->p_functions->dec );
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MODULE_ACTIVATE_STOP
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MODULE_DEACTIVATE_START
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MODULE_DEACTIVATE_STOP
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/*****************************************************************************
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* decoder_Probe: probe the decoder and return score
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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 decoder_Probe( u8 *pi_type )
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{
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return ( *pi_type == DVD_SPU_ES ) ? 0 : -1;
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}
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/*****************************************************************************
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* decoder_Run: this function is called just after the thread is created
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*****************************************************************************/
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static int decoder_Run( decoder_config_t * p_config )
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{
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spudec_thread_t * p_spudec;
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intf_WarnMsg( 3, "spudec: thread launched. Initializing ..." );
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/* Allocate the memory needed to store the thread's structure */
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p_spudec = (spudec_thread_t *)malloc( sizeof(spudec_thread_t) );
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if ( p_spudec == NULL )
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{
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intf_ErrMsg( "spudec error: not enough memory "
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"for spudec_CreateThread() to create the new thread" );
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DecoderError( p_config->p_decoder_fifo );
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return( -1 );
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}
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/*
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* Initialize the thread properties
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*/
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p_spudec->p_config = p_config;
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p_spudec->p_fifo = p_config->p_decoder_fifo;
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/*
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* Initialize thread and free configuration
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*/
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p_spudec->p_fifo->b_error = InitThread( p_spudec );
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/*
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* Main loop - it is not executed if an error occured during
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* initialization
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*/
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while( (!p_spudec->p_fifo->b_die) && (!p_spudec->p_fifo->b_error) )
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{
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if( !SyncPacket( p_spudec ) )
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{
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ParsePacket( p_spudec );
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}
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}
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/*
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* Error loop
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*/
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if( p_spudec->p_fifo->b_error )
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{
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DecoderError( p_spudec->p_fifo );
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}
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/* End of thread */
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EndThread( p_spudec );
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if( p_spudec->p_fifo->b_error )
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{
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return( -1 );
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}
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return( 0 );
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}
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/* following functions are local */
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/*****************************************************************************
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* InitThread: initialize spu decoder thread
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*****************************************************************************
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* This function is called from RunThread and performs the second step of the
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* initialization. It returns 0 on success. Note that the thread's flag are not
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* modified inside this function.
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*****************************************************************************/
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static int InitThread( spudec_thread_t *p_spudec )
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{
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/* Find an available video output */
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vlc_mutex_lock( &p_vout_bank->lock );
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while( p_vout_bank->i_count == 0 )
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{
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vlc_mutex_unlock( &p_vout_bank->lock );
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if( p_spudec->p_fifo->b_die || p_spudec->p_fifo->b_error )
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{
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return( -1 );
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}
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msleep( VOUT_OUTMEM_SLEEP );
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vlc_mutex_lock( &p_vout_bank->lock );
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}
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/* Take the first video output FIXME: take the best one */
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p_spudec->p_vout = p_vout_bank->pp_vout[ 0 ];
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vlc_mutex_unlock( &p_vout_bank->lock );
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InitBitstream( &p_spudec->bit_stream,
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p_spudec->p_config->p_decoder_fifo, NULL, NULL );
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/* Mark thread as running and return */
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return( 0 );
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}
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/*****************************************************************************
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* EndThread: thread destruction
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*****************************************************************************
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* This function is called when the thread ends after a sucessful
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* initialization.
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*****************************************************************************/
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static void EndThread( spudec_thread_t *p_spudec )
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{
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free( p_spudec );
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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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static int 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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static void 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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intf_WarnMsg( 3, "spudec: 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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intf_WarnMsg( 3, "spudec error: 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, DVD_SUBPICTURE,
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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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/* Get display time now. If we do it later, we may miss the PTS. */
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p_spudec->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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intf_ErrMsg( "spudec error: could not allocate 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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/* Get RLE data */
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for( i_offset = 0;
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i_offset + SPU_CHUNK_SIZE < 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, SPU_CHUNK_SIZE );
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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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GetChunk( &p_spudec->bit_stream, p_src + i_offset,
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p_spudec->i_rle_size - i_offset );
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#if 0
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/* Dump the subtitle info */
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intf_WarnHexDump( 5, p_spu->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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intf_WarnMsg( 3, "spudec: 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->type.spu.i_offset[0], p_spu->type.spu.i_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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/* XXX: temporary variables */
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boolean_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_spudec->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_spudec->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_spudec->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) - trashed */
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RemoveBits( &p_spudec->bit_stream, 16 );
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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) - trashed */
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RemoveBits( &p_spudec->bit_stream, 16 );
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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->type.spu.i_offset[0] =
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GetBits( &p_spudec->bit_stream, 16 ) - 4;
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p_spu->type.spu.i_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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intf_ErrMsg( "spudec error: 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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intf_ErrMsg( "spudec error: 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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intf_ErrMsg( "spudec error: 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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intf_ErrMsg( "spudec error: 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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intf_WarnMsg( 2, "spudec warning: %i padding bytes, we usually "
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"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 )
|
|
{
|
|
RemoveBits( &p_spudec->bit_stream, 8 );
|
|
i_index++;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if( b_force_display )
|
|
{
|
|
intf_ErrMsg( "spudec: \"force display\" command" );
|
|
intf_ErrMsg( "spudec: send mail to <sam@zoy.org> if you "
|
|
"want to help debugging this" );
|
|
}
|
|
|
|
/* Successfully parsed ! */
|
|
return( 0 );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* ParseRLE: parse the RLE part of the subtitle
|
|
*****************************************************************************
|
|
* This part parses the subtitle graphical data and stores it in a more
|
|
* convenient structure for later decoding. For more information on the
|
|
* subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
|
|
*****************************************************************************/
|
|
static int ParseRLE( spudec_thread_t *p_spudec,
|
|
subpicture_t * p_spu, u8 * p_src )
|
|
{
|
|
unsigned int i_code;
|
|
|
|
unsigned int i_width = p_spu->i_width;
|
|
unsigned int i_height = p_spu->i_height;
|
|
unsigned int i_x, i_y;
|
|
|
|
u16 *p_dest = (u16 *)p_spu->p_data;
|
|
|
|
/* The subtitles are interlaced, we need two offsets */
|
|
unsigned int i_id = 0; /* Start on the even SPU layer */
|
|
unsigned int pi_table[ 2 ];
|
|
unsigned int *pi_offset;
|
|
|
|
boolean_t b_empty_top = 1,
|
|
b_empty_bottom = 0;
|
|
unsigned int i_skipped_top = 0,
|
|
i_skipped_bottom = 0;
|
|
|
|
pi_table[ 0 ] = p_spu->type.spu.i_offset[ 0 ] << 1;
|
|
pi_table[ 1 ] = p_spu->type.spu.i_offset[ 1 ] << 1;
|
|
|
|
for( i_y = 0 ; i_y < i_height ; i_y++ )
|
|
{
|
|
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 ! */
|
|
intf_ErrMsg( "spudec error: unknown RLE code "
|
|
"0x%.4x", i_code );
|
|
return( 1 );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
|
|
{
|
|
intf_ErrMsg( "spudec error: 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 );
|
|
}
|
|
|
|
if( i_code == (i_width << 2) ) /* FIXME: we assume 0 is transp */
|
|
{
|
|
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 )
|
|
{
|
|
intf_ErrMsg( "spudec error: 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 )
|
|
{
|
|
intf_ErrMsg( "spudec: padding bytes found in RLE sequence" );
|
|
intf_ErrMsg( "spudec: 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 );
|
|
}
|
|
|
|
intf_WarnMsg( 3, "spudec: 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;
|
|
|
|
intf_WarnMsg( 3, "spudec: cropped to: %ix%i, position: %i,%i",
|
|
p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
|