parse.c
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上传日期:2020-07-06
资源大小:29949k
文件大小:25k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * parse.c: SPU parser
- *****************************************************************************
- * Copyright (C) 2000-2001, 2005, 2006 the VideoLAN team
- * $Id: b2ea3a177c1f18ae7365a7e3e377ebba60ccb689 $
- *
- * Authors: Sam Hocevar <sam@zoy.org>
- * Laurent Aimar <fenrir@via.ecp.fr>
- * Gildas Bazin <gbazin@videolan.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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #include <vlc_vout.h>
- #include <vlc_codec.h>
- #include <vlc_input.h>
- #include "spudec.h"
- /*****************************************************************************
- * Local prototypes.
- *****************************************************************************/
- typedef struct
- {
- int i_width;
- int i_height;
- int i_x;
- int i_y;
- } spu_properties_t;
- typedef struct
- {
- int pi_offset[2]; /* byte offsets to data */
- uint16_t *p_data;
- /* Color information */
- bool b_palette;
- uint8_t pi_alpha[4];
- uint8_t pi_yuv[4][3];
- /* Auto crop fullscreen subtitles */
- bool b_auto_crop;
- int i_y_top_offset;
- int i_y_bottom_offset;
- } subpicture_data_t;
- static int ParseControlSeq( decoder_t *, subpicture_t *, subpicture_data_t *,
- spu_properties_t *, mtime_t i_pts );
- static int ParseRLE ( decoder_t *, subpicture_data_t *,
- const spu_properties_t * );
- static void Render ( decoder_t *, subpicture_t *, subpicture_data_t *,
- const spu_properties_t * );
- /*****************************************************************************
- * AddNibble: read a nibble from a source packet and add it to our integer.
- *****************************************************************************/
- static inline unsigned int AddNibble( unsigned int i_code,
- const uint8_t *p_src, unsigned int *pi_index )
- {
- if( *pi_index & 0x1 )
- {
- return( i_code << 4 | ( p_src[(*pi_index)++ >> 1] & 0xf ) );
- }
- else
- {
- return( i_code << 4 | p_src[(*pi_index)++ >> 1] >> 4 );
- }
- }
- /*****************************************************************************
- * 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.
- *****************************************************************************/
- subpicture_t * ParsePacket( decoder_t *p_dec )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- subpicture_t *p_spu;
- subpicture_data_t spu_data;
- spu_properties_t spu_properties;
- /* Allocate the subpicture internal data. */
- p_spu = decoder_NewSubpicture( p_dec );
- if( !p_spu ) return NULL;
- p_spu->i_original_picture_width =
- p_dec->fmt_in.subs.spu.i_original_frame_width;
- p_spu->i_original_picture_height =
- p_dec->fmt_in.subs.spu.i_original_frame_height;
- /* Getting the control part */
- if( ParseControlSeq( p_dec, p_spu, &spu_data, &spu_properties, p_sys->i_pts ) )
- {
- /* There was a parse error, delete the subpicture */
- decoder_DeleteSubpicture( p_dec, p_spu );
- return NULL;
- }
- /* 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.
- *
- * Rationale for the "p_spudec->i_rle_size * 4*sizeof(*spu_data.p_data)":
- * one byte gaves two nibbles and may be used twice (once per field)
- * generating 4 codes.
- */
- spu_data.p_data = malloc( sizeof(*spu_data.p_data) * 2 * 2 * p_sys->i_rle_size );
- /* We try to display it */
- if( ParseRLE( p_dec, &spu_data, &spu_properties ) )
- {
- /* There was a parse error, delete the subpicture */
- decoder_DeleteSubpicture( p_dec, p_spu );
- free( spu_data.p_data );
- return NULL;
- }
- #ifdef DEBUG_SPUDEC
- msg_Dbg( p_dec, "total size: 0x%x, RLE offsets: 0x%x 0x%x",
- p_sys->i_spu_size,
- spu_data.pi_offset[0], spu_data.pi_offset[1] );
- #endif
- Render( p_dec, p_spu, &spu_data, &spu_properties );
- free( spu_data.p_data );
- return p_spu;
- }
- /*****************************************************************************
- * ParseControlSeq: 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 ParseControlSeq( decoder_t *p_dec, subpicture_t *p_spu,
- subpicture_data_t *p_spu_data, spu_properties_t *p_spu_properties, mtime_t i_pts )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- /* Our current index in the SPU packet */
- unsigned int i_index = p_sys->i_rle_size + 4;
- /* The next start-of-control-sequence index and the previous one */
- unsigned int i_next_seq = 0, i_cur_seq = 0;
- /* Command and date */
- uint8_t i_command = SPU_CMD_END;
- mtime_t date = 0;
- bool b_cmd_offset = false;
- bool b_cmd_alpha = false;
- subpicture_data_t spu_data_cmd;
- if( !p_spu || !p_spu_data )
- return VLC_EGENERIC;
- /* Create working space for spu data */
- memset( &spu_data_cmd, 0, sizeof(spu_data_cmd) );
- spu_data_cmd.pi_offset[0] = -1;
- spu_data_cmd.pi_offset[1] = -1;
- spu_data_cmd.p_data = NULL;
- spu_data_cmd.b_palette = false;
- spu_data_cmd.b_auto_crop = false;
- spu_data_cmd.i_y_top_offset = 0;
- spu_data_cmd.i_y_bottom_offset = 0;
- spu_data_cmd.pi_alpha[0] = 0x00;
- spu_data_cmd.pi_alpha[1] = 0x0f;
- spu_data_cmd.pi_alpha[2] = 0x0f;
- spu_data_cmd.pi_alpha[3] = 0x0f;
- /* Initialize the structure */
- p_spu->i_start = p_spu->i_stop = 0;
- p_spu->b_ephemer = false;
- memset( p_spu_properties, 0, sizeof(*p_spu_properties) );
- /* */
- *p_spu_data = spu_data_cmd;
- for( i_index = 4 + p_sys->i_rle_size; i_index < p_sys->i_spu_size ; )
- {
- /* If we just read a command sequence, read the next one;
- * otherwise, go on with the commands of the current sequence. */
- if( i_command == SPU_CMD_END )
- {
- if( i_index + 4 > p_sys->i_spu_size )
- {
- msg_Err( p_dec, "overflow in SPU command sequence" );
- return VLC_EGENERIC;
- }
- /* */
- b_cmd_offset = false;
- b_cmd_alpha = false;
- /* Get the control sequence date */
- date = (mtime_t)GetWBE( &p_sys->buffer[i_index] ) * 11000;
- /* Next offset */
- i_cur_seq = i_index;
- i_next_seq = GetWBE( &p_sys->buffer[i_index+2] );
- if( i_next_seq > p_sys->i_spu_size )
- {
- msg_Err( p_dec, "overflow in SPU next command sequence" );
- return VLC_EGENERIC;
- }
- /* Skip what we just read */
- i_index += 4;
- }
- i_command = p_sys->buffer[i_index];
- switch( i_command )
- {
- case SPU_CMD_FORCE_DISPLAY: /* 00 (force displaying) */
- p_spu->i_start = i_pts + date;
- p_spu->b_ephemer = true;
- i_index += 1;
- break;
- /* Convert the dates in seconds to PTS values */
- case SPU_CMD_START_DISPLAY: /* 01 (start displaying) */
- p_spu->i_start = i_pts + date;
- i_index += 1;
- break;
- case SPU_CMD_STOP_DISPLAY: /* 02 (stop displaying) */
- p_spu->i_stop = i_pts + date;
- i_index += 1;
- break;
- case SPU_CMD_SET_PALETTE:
- /* 03xxxx (palette) */
- if( i_index + 3 > p_sys->i_spu_size )
- {
- msg_Err( p_dec, "overflow in SPU command" );
- return VLC_EGENERIC;
- }
- if( p_dec->fmt_in.subs.spu.palette[0] == 0xBeeF )
- {
- unsigned int idx[4];
- int i;
- spu_data_cmd.b_palette = true;
- idx[0] = (p_sys->buffer[i_index+1]>>4)&0x0f;
- idx[1] = (p_sys->buffer[i_index+1])&0x0f;
- idx[2] = (p_sys->buffer[i_index+2]>>4)&0x0f;
- idx[3] = (p_sys->buffer[i_index+2])&0x0f;
- for( i = 0; i < 4 ; i++ )
- {
- uint32_t i_color = p_dec->fmt_in.subs.spu.palette[1+idx[i]];
- /* FIXME: this job should be done sooner */
- spu_data_cmd.pi_yuv[3-i][0] = (i_color>>16) & 0xff;
- spu_data_cmd.pi_yuv[3-i][1] = (i_color>>0) & 0xff;
- spu_data_cmd.pi_yuv[3-i][2] = (i_color>>8) & 0xff;
- }
- }
- i_index += 3;
- break;
- case SPU_CMD_SET_ALPHACHANNEL: /* 04xxxx (alpha channel) */
- if( i_index + 3 > p_sys->i_spu_size )
- {
- msg_Err( p_dec, "overflow in SPU command" );
- return VLC_EGENERIC;
- }
- b_cmd_alpha = true;
- spu_data_cmd.pi_alpha[3] = (p_sys->buffer[i_index+1]>>4)&0x0f;
- spu_data_cmd.pi_alpha[2] = (p_sys->buffer[i_index+1])&0x0f;
- spu_data_cmd.pi_alpha[1] = (p_sys->buffer[i_index+2]>>4)&0x0f;
- spu_data_cmd.pi_alpha[0] = (p_sys->buffer[i_index+2])&0x0f;
- i_index += 3;
- break;
- case SPU_CMD_SET_COORDINATES: /* 05xxxyyyxxxyyy (coordinates) */
- if( i_index + 7 > p_sys->i_spu_size )
- {
- msg_Err( p_dec, "overflow in SPU command" );
- return VLC_EGENERIC;
- }
- p_spu_properties->i_x = (p_sys->buffer[i_index+1]<<4)|
- ((p_sys->buffer[i_index+2]>>4)&0x0f);
- p_spu_properties->i_width = (((p_sys->buffer[i_index+2]&0x0f)<<8)|
- p_sys->buffer[i_index+3]) - p_spu_properties->i_x + 1;
- p_spu_properties->i_y = (p_sys->buffer[i_index+4]<<4)|
- ((p_sys->buffer[i_index+5]>>4)&0x0f);
- p_spu_properties->i_height = (((p_sys->buffer[i_index+5]&0x0f)<<8)|
- p_sys->buffer[i_index+6]) - p_spu_properties->i_y + 1;
- /* Auto crop fullscreen subtitles */
- if( p_spu_properties->i_height > 250 )
- p_spu_data->b_auto_crop = true;
- i_index += 7;
- break;
- case SPU_CMD_SET_OFFSETS: /* 06xxxxyyyy (byte offsets) */
- if( i_index + 5 > p_sys->i_spu_size )
- {
- msg_Err( p_dec, "overflow in SPU command" );
- return VLC_EGENERIC;
- }
- b_cmd_offset = true;
- p_spu_data->pi_offset[0] = GetWBE(&p_sys->buffer[i_index+1]) - 4;
- p_spu_data->pi_offset[1] = GetWBE(&p_sys->buffer[i_index+3]) - 4;
- i_index += 5;
- break;
- case SPU_CMD_END: /* ff (end) */
- if( b_cmd_offset )
- {
- /* It seems that palette and alpha from the block having
- * the cmd offset have to be used
- * XXX is it all ? */
- p_spu_data->b_palette = spu_data_cmd.b_palette;
- if( spu_data_cmd.b_palette )
- memcpy( p_spu_data->pi_yuv, spu_data_cmd.pi_yuv, sizeof(spu_data_cmd.pi_yuv) );
- if( b_cmd_alpha )
- memcpy( p_spu_data->pi_alpha, spu_data_cmd.pi_alpha, sizeof(spu_data_cmd.pi_alpha) );
- }
- i_index += 1;
- break;
- default: /* xx (unknown command) */
- msg_Warn( p_dec, "unknown SPU command 0x%.2x", i_command );
- if( i_index + 1 < i_next_seq )
- {
- /* There is at least one other command sequence */
- if( p_sys->buffer[i_next_seq - 1] == SPU_CMD_END )
- {
- /* This is consistent. Skip to that command sequence. */
- i_index = i_next_seq;
- }
- else
- {
- /* There were other commands. */
- msg_Warn( p_dec, "cannot recover, dropping subtitle" );
- return VLC_EGENERIC;
- }
- }
- else
- {
- /* We were in the last command sequence. Stop parsing by
- * pretending we met an SPU_CMD_END command. */
- i_command = SPU_CMD_END;
- i_index++;
- }
- }
- /* */
- if( i_command == SPU_CMD_END && i_index != i_next_seq )
- break;
- }
- /* Check that the next sequence index matches the current one */
- if( i_next_seq != i_cur_seq )
- {
- msg_Err( p_dec, "index mismatch (0x%.4x != 0x%.4x)",
- i_next_seq, i_cur_seq );
- return VLC_EGENERIC;
- }
- if( i_index > p_sys->i_spu_size )
- {
- msg_Err( p_dec, "uh-oh, we went too far (0x%.4x > 0x%.4x)",
- i_index, p_sys->i_spu_size );
- return VLC_EGENERIC;
- }
- const int i_spu_size = p_sys->i_spu - 4;
- if( p_spu_data->pi_offset[0] < 0 || p_spu_data->pi_offset[0] >= i_spu_size ||
- p_spu_data->pi_offset[1] < 0 || p_spu_data->pi_offset[1] >= i_spu_size )
- {
- msg_Err( p_dec, "invalid offset values" );
- return VLC_EGENERIC;
- }
- if( !p_spu->i_start )
- {
- msg_Err( p_dec, "no `start display' command" );
- return VLC_EGENERIC;
- }
- if( p_spu->i_stop <= p_spu->i_start && !p_spu->b_ephemer )
- {
- /* This subtitle will live for 5 seconds or until the next subtitle */
- p_spu->i_stop = p_spu->i_start + (mtime_t)500 * 11000;
- p_spu->b_ephemer = true;
- }
- /* Get rid of padding bytes */
- if( p_sys->i_spu_size > i_index + 1 )
- {
- /* Zero or one padding byte are quite usual
- * More than one padding byte - this is very strange, but
- * we can ignore them. */
- msg_Warn( p_dec, "%i padding bytes, we usually get 0 or 1 of them",
- p_sys->i_spu_size - i_index );
- }
- /* Successfully parsed ! */
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * 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( decoder_t *p_dec,
- subpicture_data_t *p_spu_data,
- const spu_properties_t *p_spu_properties )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- const unsigned int i_width = p_spu_properties->i_width;
- const unsigned int i_height = p_spu_properties->i_height;
- unsigned int i_x, i_y;
- uint16_t *p_dest = p_spu_data->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;
- /* Cropping */
- bool b_empty_top = true;
- unsigned int i_skipped_top = 0, i_skipped_bottom = 0;
- unsigned int i_transparent_code = 0;
- /* Colormap statistics */
- int i_border = -1;
- int stats[4]; stats[0] = stats[1] = stats[2] = stats[3] = 0;
- pi_table[ 0 ] = p_spu_data->pi_offset[ 0 ] << 1;
- pi_table[ 1 ] = p_spu_data->pi_offset[ 1 ] << 1;
- for( i_y = 0 ; i_y < i_height ; i_y++ )
- {
- unsigned int i_code;
- pi_offset = pi_table + i_id;
- for( i_x = 0 ; i_x < i_width ; i_x += i_code >> 2 )
- {
- i_code = 0;
- for( unsigned int i_min = 1; i_min <= 0x40 && i_code < i_min; i_min <<= 2 )
- {
- if( (*pi_offset >> 1) >= p_sys->i_spu_size )
- {
- msg_Err( p_dec, "out of bounds while reading rle" );
- return VLC_EGENERIC;
- }
- i_code = AddNibble( i_code, &p_sys->buffer[4], pi_offset );
- }
- if( i_code < 0x0004 )
- {
- /* If the 14 first bits are set to 0, then it's a
- * new line. We emulate it. */
- i_code |= ( i_width - i_x ) << 2;
- }
- if( ( (i_code >> 2) + i_x + i_y * i_width ) > i_height * i_width )
- {
- msg_Err( p_dec, "out of bounds, %i at (%i,%i) is out of %ix%i",
- i_code >> 2, i_x, i_y, i_width, i_height );
- return VLC_EGENERIC;
- }
- /* Try to find the border color */
- if( p_spu_data->pi_alpha[ i_code & 0x3 ] != 0x00 )
- {
- i_border = i_code & 0x3;
- stats[i_border] += i_code >> 2;
- }
- /* Auto crop subtitles (a lot more optimized) */
- if( p_spu_data->b_auto_crop )
- {
- if( !i_y )
- {
- /* We assume that if the first line is transparent, then
- * it is using the palette index for the
- * (background) transparent color */
- if( (i_code >> 2) == i_width &&
- p_spu_data->pi_alpha[ i_code & 0x3 ] == 0x00 )
- {
- i_transparent_code = i_code;
- }
- else
- {
- p_spu_data->b_auto_crop = false;
- }
- }
- if( i_code == i_transparent_code )
- {
- 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;
- i_skipped_bottom++;
- }
- }
- else
- {
- /* We got a valid code, store it */
- *p_dest++ = i_code;
- /* Valid code means no blank line */
- b_empty_top = false;
- i_skipped_bottom = 0;
- }
- }
- else
- {
- *p_dest++ = i_code;
- }
- }
- /* Check that we didn't go too far */
- if( i_x > i_width )
- {
- msg_Err( p_dec, "i_x overflowed, %i > %i", i_x, i_width );
- return VLC_EGENERIC;
- }
- /* 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_dec, "padding bytes found in RLE sequence" );
- msg_Err( p_dec, "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 VLC_EGENERIC;
- }
- #ifdef DEBUG_SPUDEC
- msg_Dbg( p_dec, "valid subtitle, size: %ix%i, position: %i,%i",
- p_spu->i_width, p_spu->i_height, p_spu->i_x, p_spu->i_y );
- #endif
- /* Crop if necessary */
- if( i_skipped_top || i_skipped_bottom )
- {
- #ifdef DEBUG_SPUDEC
- int i_y = p_spu->i_y + i_skipped_top;
- int i_height = p_spu->i_height - (i_skipped_top + i_skipped_bottom);
- #endif
- p_spu_data->i_y_top_offset = i_skipped_top;
- p_spu_data->i_y_bottom_offset = i_skipped_bottom;
- #ifdef DEBUG_SPUDEC
- msg_Dbg( p_dec, "cropped to: %ix%i, position: %i,%i",
- p_spu->i_width, i_height, p_spu->i_x, i_y );
- #endif
- }
- /* Handle color if no palette was found */
- if( !p_spu_data->b_palette )
- {
- int i, i_inner = -1, i_shade = -1;
- /* Set the border color */
- p_spu_data->pi_yuv[i_border][0] = 0x00;
- p_spu_data->pi_yuv[i_border][1] = 0x80;
- p_spu_data->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_data->pi_yuv[i_inner][0] = 0xff;
- p_spu_data->pi_yuv[i_inner][1] = 0x80;
- p_spu_data->pi_yuv[i_inner][2] = 0x80;
- }
- /* Set the anti-aliasing color */
- if( i_shade != -1 )
- {
- p_spu_data->pi_yuv[i_shade][0] = 0x80;
- p_spu_data->pi_yuv[i_shade][1] = 0x80;
- p_spu_data->pi_yuv[i_shade][2] = 0x80;
- }
- #ifdef DEBUG_SPUDEC
- msg_Dbg( p_dec, "using custom palette (border %i, inner %i, shade %i)",
- i_border, i_inner, i_shade );
- #endif
- }
- return VLC_SUCCESS;
- }
- static void Render( decoder_t *p_dec, subpicture_t *p_spu,
- subpicture_data_t *p_spu_data,
- const spu_properties_t *p_spu_properties )
- {
- uint8_t *p_p;
- int i_x, i_y, i_len, i_color, i_pitch;
- const uint16_t *p_source = p_spu_data->p_data;
- video_format_t fmt;
- video_palette_t palette;
- /* Create a new subpicture region */
- memset( &fmt, 0, sizeof(video_format_t) );
- fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
- fmt.i_aspect = 0; /* 0 means use aspect ratio of background video */
- fmt.i_width = fmt.i_visible_width = p_spu_properties->i_width;
- fmt.i_height = fmt.i_visible_height = p_spu_properties->i_height -
- p_spu_data->i_y_top_offset - p_spu_data->i_y_bottom_offset;
- fmt.i_x_offset = fmt.i_y_offset = 0;
- fmt.p_palette = &palette;
- fmt.p_palette->i_entries = 4;
- for( i_x = 0; i_x < fmt.p_palette->i_entries; i_x++ )
- {
- fmt.p_palette->palette[i_x][0] = p_spu_data->pi_yuv[i_x][0];
- fmt.p_palette->palette[i_x][1] = p_spu_data->pi_yuv[i_x][1];
- fmt.p_palette->palette[i_x][2] = p_spu_data->pi_yuv[i_x][2];
- fmt.p_palette->palette[i_x][3] =
- p_spu_data->pi_alpha[i_x] == 0xf ? 0xff :
- p_spu_data->pi_alpha[i_x] << 4;
- }
- p_spu->p_region = subpicture_region_New( &fmt );
- if( !p_spu->p_region )
- {
- msg_Err( p_dec, "cannot allocate SPU region" );
- return;
- }
- p_spu->p_region->i_x = p_spu_properties->i_x;
- p_spu->p_region->i_y = p_spu_properties->i_y + p_spu_data->i_y_top_offset;
- p_p = p_spu->p_region->p_picture->p->p_pixels;
- i_pitch = p_spu->p_region->p_picture->p->i_pitch;
- /* Draw until we reach the bottom of the subtitle */
- for( i_y = 0; i_y < (int)fmt.i_height * i_pitch; i_y += i_pitch )
- {
- /* Draw until we reach the end of the line */
- for( i_x = 0 ; i_x < (int)fmt.i_width; i_x += i_len )
- {
- /* Get the RLE part, then draw the line */
- i_color = *p_source & 0x3;
- i_len = *p_source++ >> 2;
- memset( p_p + i_x + i_y, i_color, i_len );
- }
- }
- }