* spu_decoder.c : spu decoder thread
*****************************************************************************
* Copyright (C) 2000 VideoLAN
+ * $Id: spu_decoder.c,v 1.47 2001/06/02 01:09:03 sam Exp $
*
- * Authors:
+ * Authors: Samuel Hocevar <sam@zoy.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
*****************************************************************************/
#include "defs.h"
-#include <stdlib.h> /* malloc(), free() */
-#include <sys/types.h> /* on BSD, uio.h needs types.h */
-#include <sys/uio.h> /* for input.h */
+#ifdef HAVE_UNISTD_H
#include <unistd.h> /* getpid() */
+#endif
+
+#ifdef WIN32 /* getpid() for win32 is located in process.h */
+#include <process.h>
+#endif
+
+#include <stdlib.h> /* malloc(), free() */
+#include <string.h> /* memcpy(), memset() */
#include "config.h"
#include "common.h"
#include "threads.h"
#include "mtime.h"
-#include "plugins.h"
#include "intf_msg.h"
-#include "debug.h" /* ASSERT */
#include "stream_control.h"
#include "input_ext-dec.h"
#include "spu_decoder.h"
-/*
+/*****************************************************************************
* Local prototypes
- */
-static int InitThread ( spudec_thread_t *p_spudec );
-static void RunThread ( spudec_thread_t *p_spudec );
-static void ErrorThread ( spudec_thread_t *p_spudec );
-static void EndThread ( spudec_thread_t *p_spudec );
+ *****************************************************************************/
+static int InitThread ( spudec_thread_t * );
+static void RunThread ( spudec_thread_t * );
+static void ErrorThread ( spudec_thread_t * );
+static void EndThread ( spudec_thread_t * );
-#define GetWord( i ) \
- i = GetByte( &p_spudec->bit_stream ) << 8; \
- i += GetByte( &p_spudec->bit_stream ); \
- i_index += 2;
+static int SyncPacket ( spudec_thread_t * );
+static void ParsePacket ( spudec_thread_t * );
+static int ParseControlSequences( spudec_thread_t *, subpicture_t * );
+static int ParseRLE ( spudec_thread_t *, subpicture_t *, u8 * );
/*****************************************************************************
* spudec_CreateThread: create a spu decoder thread
{
spudec_thread_t * p_spudec;
- intf_DbgMsg("spudec debug: creating spu decoder thread\n");
-
/* Allocate the memory needed to store the thread's structure */
- if ( (p_spudec = (spudec_thread_t *)malloc( sizeof(spudec_thread_t) )) == NULL )
+ p_spudec = (spudec_thread_t *)malloc( sizeof(spudec_thread_t) );
+
+ if ( p_spudec == NULL )
{
- intf_ErrMsg("spudec error: not enough memory for spudec_CreateThread() to create the new thread\n");
+ intf_ErrMsg( "spudec error: not enough memory "
+ "for spudec_CreateThread() to create the new thread" );
return( 0 );
}
/*
* Initialize the thread properties
*/
- p_spudec->p_fifo->b_die = 0;
- p_spudec->p_fifo->b_error = 0;
p_spudec->p_config = p_config;
+
p_spudec->p_fifo = p_config->decoder_config.p_decoder_fifo;
- /* Get the video output informations */
- p_spudec->p_vout = p_config->p_vout;
+ /* Spawn a video output if there is none */
+ vlc_mutex_lock( &p_vout_bank->lock );
+
+ if( p_vout_bank->i_count == 0 )
+ {
+ intf_WarnMsg( 1, "spudec: no vout present, spawning one" );
+
+ p_spudec->p_vout = vout_CreateThread( NULL );
+
+ /* Everything failed */
+ if( p_spudec->p_vout == NULL )
+ {
+ intf_Msg( "spudec: can't open vout, aborting" );
+ vlc_mutex_unlock( &p_vout_bank->lock );
+ free( p_spudec );
+
+ return 0;
+ }
+
+ p_vout_bank->pp_vout[ p_vout_bank->i_count ] = p_spudec->p_vout;
+ p_vout_bank->i_count++;
+ }
+ else
+ {
+ /* Take the first video output FIXME: take the best one */
+ p_spudec->p_vout = p_vout_bank->pp_vout[ 0 ];
+ }
+
+ vlc_mutex_unlock( &p_vout_bank->lock );
/* Spawn the spu decoder thread */
if ( vlc_thread_create(&p_spudec->thread_id, "spu decoder",
(vlc_thread_func_t)RunThread, (void *)p_spudec) )
{
- intf_ErrMsg("spudec error: can't spawn spu decoder thread\n");
+ intf_ErrMsg( "spudec error: can't spawn spu decoder thread" );
free( p_spudec );
- return( 0 );
+ return 0;
}
- intf_DbgMsg("spudec debug: spu decoder thread (%p) created\n", p_spudec);
return( p_spudec->thread_id );
}
*****************************************************************************/
static int InitThread( spudec_thread_t *p_spudec )
{
- intf_DbgMsg("spudec debug: initializing spu decoder thread %p\n", p_spudec);
-
- p_spudec->p_config->decoder_config.pf_init_bit_stream( &p_spudec->bit_stream,
- p_spudec->p_config->decoder_config.p_decoder_fifo );
+ p_spudec->p_config->decoder_config.pf_init_bit_stream(
+ &p_spudec->bit_stream,
+ p_spudec->p_config->decoder_config.p_decoder_fifo, NULL, NULL );
/* Mark thread as running and return */
- intf_DbgMsg( "spudec debug: InitThread(%p) succeeded\n", p_spudec );
return( 0 );
}
*****************************************************************************/
static void RunThread( spudec_thread_t *p_spudec )
{
- intf_DbgMsg("spudec debug: running spu decoder thread (%p) (pid == %i)\n",
- p_spudec, getpid());
+ intf_WarnMsg( 3, "spudec: spu decoder thread %i spawned", getpid() );
/*
* Initialize thread and free configuration
*/
while( (!p_spudec->p_fifo->b_die) && (!p_spudec->p_fifo->b_error) )
{
- int i_packet_size;
- int i_rle_size;
- int i_index;
- int i_pes_size;
- int i_pes_count;
- boolean_t b_finished;
- unsigned char * p_spu_data;
- subpicture_t * p_spu = NULL;
-
- while( !DECODER_FIFO_ISEMPTY(*p_spudec->p_fifo) )
+ if( !SyncPacket( p_spudec ) )
{
- /* wait for the next SPU ID.
- * XXX: We trash 0xff bytes since they probably come from
- * an incomplete previous packet */
- do
- {
- i_packet_size = GetByte( &p_spudec->bit_stream );
- }
- while( i_packet_size == 0xff );
-
- if( p_spudec->p_fifo->b_die )
- break;
-
- /* the total size - should equal the sum of the
- * PES packet size that form the SPU packet */
- i_packet_size = ( i_packet_size << 8 )
- + GetByte( &p_spudec->bit_stream );
- i_index = 2;
-
- /* get the useful PES size (real size - 10) */
- i_pes_size = DECODER_FIFO_START(*p_spudec->p_fifo)->i_pes_size - 9;
- i_pes_count = 1;
-
- /* the RLE stuff size */
- GetWord( i_rle_size );
-
- /* if the values we got aren't too strange, decode the data */
- if( i_rle_size < i_packet_size )
- {
- /* allocate the subpicture.
- * FIXME: we should check if the allocation failed */
- p_spu = vout_CreateSubPicture( p_spudec->p_vout,
- DVD_SUBPICTURE, i_rle_size );
- p_spu_data = p_spu->p_data;
-
- /* get display time */
- p_spu->begin_date = p_spu->end_date
- = DECODER_FIFO_START(*p_spudec->p_fifo)->i_pts;
-
- /* getting the RLE part */
- while( i_index++ < i_rle_size )
- {
- /* skip the leading byte of a PES */
- /* FIXME: this part definitely looks strange */
- if ( !((i_index + 3) % i_pes_size) )
- {
- i_pes_count++;
- }
- *p_spu_data++ = GetByte( &p_spudec->bit_stream );
- }
-
- /* getting the control part */
- b_finished = 0;
- do
- {
- unsigned char i_cmd;
- unsigned int i_word;
- unsigned int i_date;
-
- /* the date */
- GetWord( i_date );
-
- /* next offset, no next offset if == i_index-5 */
- GetWord( i_word );
- b_finished = ( i_index - 5 >= i_word );
-
- do
- {
- i_cmd = GetByte( &p_spudec->bit_stream );
- i_index++;
-
- switch( i_cmd )
- {
- case SPU_CMD_FORCE_DISPLAY:
- /* 00 (force displaying) */
- break;
- /* FIXME: here we have to calculate dates. It's
- * around i_date * 12000 but I don't know
- * how much exactly.
- */
- case SPU_CMD_START_DISPLAY:
- /* 01 (start displaying) */
- p_spu->begin_date += ( i_date * 12000 );
- break;
- case SPU_CMD_STOP_DISPLAY:
- /* 02 (stop displaying) */
- p_spu->end_date += ( i_date * 12000 );
- break;
- case SPU_CMD_SET_PALETTE:
- /* 03xxxx (palette) */
- GetWord( i_word );
- break;
- case SPU_CMD_SET_ALPHACHANNEL:
- /* 04xxxx (alpha channel) */
- GetWord( i_word );
- break;
- case SPU_CMD_SET_COORDINATES:
- /* 05xxxyyyxxxyyy (coordinates) */
- i_word = GetByte( &p_spudec->bit_stream );
- p_spu->i_x = (i_word << 4)
- | GetBits( &p_spudec->bit_stream, 4 );
-
- i_word = GetBits( &p_spudec->bit_stream, 4 );
- p_spu->i_width = p_spu->i_x - ( (i_word << 8)
- | GetByte( &p_spudec->bit_stream ) ) + 1;
-
- i_word = GetByte( &p_spudec->bit_stream );
- p_spu->i_y = (i_word << 4)
- | GetBits( &p_spudec->bit_stream, 4 );
-
- i_word = GetBits( &p_spudec->bit_stream, 4 );
- p_spu->i_height = p_spu->i_y - ( (i_word << 8)
- | GetByte( &p_spudec->bit_stream ) ) + 1;
-
- i_index += 6;
- break;
- case SPU_CMD_SET_OFFSETS:
- /* 06xxxxyyyy (byte offsets) */
- GetWord( i_word );
- p_spu->type.spu.i_offset[0] = i_word - 4;
- GetWord( i_word );
- p_spu->type.spu.i_offset[1] = i_word - 4;
- break;
- case SPU_CMD_END:
- /* ff (end) */
- break;
- default:
- /* ?? (unknown command) */
- intf_ErrMsg( "spudec: unknown command 0x%.2x\n",
- i_cmd );
- break;
- }
- }
- while( i_cmd != SPU_CMD_END );
- }
- while( !b_finished );
-
- /* SPU is finished - we can tell the video output
- * to display it */
- vout_DisplaySubPicture( p_spudec->p_vout, p_spu );
- }
- else
- {
- /* Unexpected PES packet - trash it */
- intf_ErrMsg( "spudec: trying to recover from bad packet\n" );
- vlc_mutex_lock( &p_spudec->p_fifo->data_lock );
- p_spudec->p_fifo->pf_delete_pes( p_spudec->p_fifo->p_packets_mgt,
- DECODER_FIFO_START(*p_spudec->p_fifo) );
- DECODER_FIFO_INCSTART( *p_spudec->p_fifo );
- vlc_mutex_unlock( &p_spudec->p_fifo->data_lock );
- }
-
+ ParsePacket( p_spudec );
}
}
}
/* End of thread */
+ intf_WarnMsg( 3, "spudec: destroying spu decoder thread %i", getpid() );
EndThread( p_spudec );
}
}
/* Waiting for the input thread to put new PES packets in the fifo */
- vlc_cond_wait( &p_spudec->p_fifo->data_wait, &p_spudec->p_fifo->data_lock );
+ vlc_cond_wait( &p_spudec->p_fifo->data_wait,
+ &p_spudec->p_fifo->data_lock );
}
/* We can release the lock before leaving */
*****************************************************************************/
static void EndThread( spudec_thread_t *p_spudec )
{
- intf_DbgMsg( "spudec debug: destroying spu decoder thread %p\n", p_spudec );
free( p_spudec->p_config );
free( p_spudec );
- intf_DbgMsg( "spudec debug: spu decoder thread %p destroyed\n", p_spudec);
+}
+
+/*****************************************************************************
+ * SyncPacket: get in sync with the stream
+ *****************************************************************************
+ * This function makes a few sanity checks and returns 0 if it looks like we
+ * are at the beginning of a subpicture packet.
+ *****************************************************************************/
+static int SyncPacket( spudec_thread_t *p_spudec )
+{
+ /* Re-align the buffer on an 8-bit boundary */
+ RealignBits( &p_spudec->bit_stream );
+
+ /* The total SPU packet size, often bigger than a PS packet */
+ p_spudec->i_spu_size = GetBits( &p_spudec->bit_stream, 16 );
+
+ /* The RLE stuff size (remove 4 because we just read 32 bits) */
+ p_spudec->i_rle_size = ShowBits( &p_spudec->bit_stream, 16 ) - 4;
+
+ /* If the values we got are a bit strange, skip packet */
+ if( !p_spudec->i_spu_size
+ || ( p_spudec->i_rle_size >= p_spudec->i_spu_size ) )
+ {
+ return( 1 );
+ }
+
+ RemoveBits( &p_spudec->bit_stream, 16 );
+
+ return( 0 );
+}
+
+/*****************************************************************************
+ * ParsePacket: parse an SPU packet and send it to the video output
+ *****************************************************************************
+ * This function parses the SPU packet and, if valid, sends it to the
+ * video output.
+ *****************************************************************************/
+static void ParsePacket( spudec_thread_t *p_spudec )
+{
+ subpicture_t * p_spu;
+ u8 * p_src;
+ unsigned int i_offset;
+
+ intf_WarnMsg( 3, "spudec: trying to gather a 0x%.2x long subtitle",
+ p_spudec->i_spu_size );
+
+ /* We cannot display a subpicture with no date */
+ if( DECODER_FIFO_START(*p_spudec->p_fifo)->i_pts == 0 )
+ {
+ intf_WarnMsg( 3, "spudec error: subtitle without a date" );
+ return;
+ }
+
+ /* Allocate the subpicture internal data. */
+ p_spu = vout_CreateSubPicture( p_spudec->p_vout, DVD_SUBPICTURE,
+ p_spudec->i_rle_size * 4 );
+ /* Rationale for the "p_spudec->i_rle_size * 4": we are going to
+ * expand the RLE stuff so that we won't need to read nibbles later
+ * on. This will speed things up a lot. Plus, we'll only need to do
+ * this stupid interlacing stuff once. */
+
+ if( p_spu == NULL )
+ {
+ return;
+ }
+
+ /* Get display time now. If we do it later, we may miss the PTS. */
+ p_spudec->i_pts = DECODER_FIFO_START(*p_spudec->p_fifo)->i_pts;
+
+ /* Allocate the temporary buffer we will parse */
+ p_src = malloc( p_spudec->i_rle_size );
+
+ if( p_src == NULL )
+ {
+ intf_ErrMsg( "spudec error: could not allocate p_src" );
+ vout_DestroySubPicture( p_spudec->p_vout, p_spu );
+ return;
+ }
+
+ /* Get RLE data */
+ for( i_offset = 0;
+ i_offset + SPU_CHUNK_SIZE < p_spudec->i_rle_size;
+ i_offset += SPU_CHUNK_SIZE )
+ {
+ GetChunk( &p_spudec->bit_stream, p_src + i_offset, SPU_CHUNK_SIZE );
+
+ if( p_spudec->p_fifo->b_die )
+ {
+ free( p_src );
+ vout_DestroySubPicture( p_spudec->p_vout, p_spu );
+ return;
+ }
+ }
+
+ GetChunk( &p_spudec->bit_stream, p_src + i_offset,
+ p_spudec->i_rle_size - i_offset );
+
+#if 0
+ /* Dump the subtitle info */
+ intf_WarnHexDump( 5, p_spu->p_data, p_spudec->i_rle_size );
+#endif
+
+ /* Getting the control part */
+ if( p_spudec->p_fifo->b_die || ParseControlSequences( p_spudec, p_spu ) )
+ {
+ /* There was a parse error, delete the subpicture */
+ free( p_src );
+ vout_DestroySubPicture( p_spudec->p_vout, p_spu );
+ return;
+ }
+
+ if( ParseRLE( p_spudec, p_spu, p_src ) )
+ {
+ /* There was a parse error, delete the subpicture */
+ free( p_src );
+ vout_DestroySubPicture( p_spudec->p_vout, p_spu );
+ return;
+ }
+
+ intf_WarnMsg( 3, "spudec: total size: 0x%x, RLE offsets: 0x%x 0x%x",
+ p_spudec->i_spu_size,
+ p_spu->type.spu.i_offset[0], p_spu->type.spu.i_offset[1] );
+
+ /* SPU is finished - we can ask the video output to display it */
+ vout_DisplaySubPicture( p_spudec->p_vout, p_spu );
+
+ /* Clean up */
+ free( p_src );
+}
+
+/*****************************************************************************
+ * ParseControlSequences: parse all SPU control sequences
+ *****************************************************************************
+ * This is the most important part in SPU decoding. We get dates, palette
+ * information, coordinates, and so on. For more information on the
+ * subtitles format, see http://sam.zoy.org/doc/dvd/subtitles/index.html
+ *****************************************************************************/
+static int ParseControlSequences( spudec_thread_t *p_spudec,
+ subpicture_t * p_spu )
+{
+ /* Our current index in the SPU packet */
+ int i_index = p_spudec->i_rle_size + 4;
+
+ /* The next start-of-control-sequence index and the previous one */
+ int i_next_seq, i_cur_seq;
+
+ /* Command time and date */
+ u8 i_command;
+ int i_date;
+
+ /* XXX: temporary variables */
+ boolean_t b_force_display = 0;
+
+ /* Initialize the structure */
+ p_spu->i_start = p_spu->i_stop = 0;
+ p_spu->b_ephemer = 0;
+
+ do
+ {
+ /* Get the control sequence date */
+ i_date = GetBits( &p_spudec->bit_stream, 16 );
+
+ /* Next offset */
+ i_cur_seq = i_index;
+ i_next_seq = GetBits( &p_spudec->bit_stream, 16 );
+
+ /* Skip what we just read */
+ i_index += 4;
+
+ do
+ {
+ i_command = GetBits( &p_spudec->bit_stream, 8 );
+ i_index++;
+
+ switch( i_command )
+ {
+ case SPU_CMD_FORCE_DISPLAY:
+
+ /* 00 (force displaying) */
+ p_spu->i_start = p_spudec->i_pts + ( i_date * 11000 );
+ b_force_display = 1;
+
+ break;
+
+ /* Convert the dates in seconds to PTS values */
+ case SPU_CMD_START_DISPLAY:
+
+ /* 01 (start displaying) */
+ p_spu->i_start = p_spudec->i_pts + ( i_date * 11000 );
+
+ break;
+
+ case SPU_CMD_STOP_DISPLAY:
+
+ /* 02 (stop displaying) */
+ p_spu->i_stop = p_spudec->i_pts + ( i_date * 11000 );
+
+ break;
+
+ case SPU_CMD_SET_PALETTE:
+
+ /* 03xxxx (palette) - trashed */
+ RemoveBits( &p_spudec->bit_stream, 16 );
+ i_index += 2;
+
+ break;
+
+ case SPU_CMD_SET_ALPHACHANNEL:
+
+ /* 04xxxx (alpha channel) - trashed */
+ RemoveBits( &p_spudec->bit_stream, 16 );
+ i_index += 2;
+
+ break;
+
+ case SPU_CMD_SET_COORDINATES:
+
+ /* 05xxxyyyxxxyyy (coordinates) */
+ p_spu->i_x = GetBits( &p_spudec->bit_stream, 12 );
+ p_spu->i_width = GetBits( &p_spudec->bit_stream, 12 )
+ - p_spu->i_x + 1;
+
+ p_spu->i_y = GetBits( &p_spudec->bit_stream, 12 );
+ p_spu->i_height = GetBits( &p_spudec->bit_stream, 12 )
+ - p_spu->i_y + 1;
+
+ i_index += 6;
+
+ break;
+
+ case SPU_CMD_SET_OFFSETS:
+
+ /* 06xxxxyyyy (byte offsets) */
+ p_spu->type.spu.i_offset[0] =
+ GetBits( &p_spudec->bit_stream, 16 ) - 4;
+
+ p_spu->type.spu.i_offset[1] =
+ GetBits( &p_spudec->bit_stream, 16 ) - 4;
+
+ i_index += 4;
+
+ break;
+
+ case SPU_CMD_END:
+
+ /* ff (end) */
+ break;
+
+ default:
+
+ /* xx (unknown command) */
+ intf_ErrMsg( "spudec error: unknown command 0x%.2x",
+ i_command );
+ return( 1 );
+ }
+
+ } while( i_command != SPU_CMD_END );
+
+ } while( i_index == i_next_seq );
+
+ /* Check that the next sequence index matches the current one */
+ if( i_next_seq != i_cur_seq )
+ {
+ intf_ErrMsg( "spudec error: index mismatch (0x%.4x != 0x%.4x)",
+ i_next_seq, i_cur_seq );
+ return( 1 );
+ }
+
+ if( i_index > p_spudec->i_spu_size )
+ {
+ intf_ErrMsg( "spudec error: uh-oh, we went too far (0x%.4x > 0x%.4x)",
+ i_index, p_spudec->i_spu_size );
+ return( 1 );
+ }
+
+ if( !p_spu->i_start )
+ {
+ intf_ErrMsg( "spudec error: no `start display' command" );
+ }
+
+ if( !p_spu->i_stop )
+ {
+ /* This subtitle will live for 5 seconds or until the next subtitle */
+ p_spu->i_stop = p_spu->i_start + 500 * 11000;
+ p_spu->b_ephemer = 1;
+ }
+
+ /* Get rid of padding bytes */
+ switch( p_spudec->i_spu_size - i_index )
+ {
+ /* Zero or one padding byte, quite usual */
+ case 1:
+ RemoveBits( &p_spudec->bit_stream, 8 );
+ i_index++;
+ case 0:
+ break;
+
+ /* More than one padding byte - this is very strange, but
+ * we can deal with it */
+ default:
+ intf_WarnMsg( 2, "spudec warning: %i padding bytes, we usually "
+ "get 1 or none",
+ p_spudec->i_spu_size - i_index );
+
+ 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 );
}
projects / vlc / blobdiff