dvbsub.c
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上传日期:2009-03-27
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文件大小:54k
- /*****************************************************************************
- * dvbsub.c : DVB subtitles decoder
- * DVB subtitles encoder (developed for Anevia, www.anevia.com)
- *****************************************************************************
- * Copyright (C) 2003 ANEVIA
- * Copyright (C) 2003-2004 VideoLAN
- * $Id: dvbsub.c 9027 2004-10-21 13:20:54Z gbazin $
- *
- * Authors: Gildas Bazin <gbazin@videolan.org>
- * Damien LUCAS <damien.lucas@anevia.com>
- * Laurent Aimar <fenrir@via.ecp.fr>
- *
- * 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- /*****************************************************************************
- * Preamble
- *****************************************************************************/
- #include <vlc/vlc.h>
- #include <vlc/vout.h>
- #include <vlc/decoder.h>
- #include <vlc/sout.h>
- #include "vlc_bits.h"
- //#define DEBUG_DVBSUB 1
- /*****************************************************************************
- * Module descriptor.
- *****************************************************************************/
- static int Open ( vlc_object_t * );
- static void Close( vlc_object_t * );
- static subpicture_t *Decode( decoder_t *, block_t ** );
- static int OpenEncoder ( vlc_object_t * );
- static void CloseEncoder( vlc_object_t * );
- static block_t *Encode ( encoder_t *, subpicture_t * );
- vlc_module_begin();
- set_description( _("DVB subtitles decoder") );
- set_capability( "decoder", 50 );
- set_callbacks( Open, Close );
- # define ENC_CFG_PREFIX "sout-dvbsub-"
- add_submodule();
- set_description( _("DVB subtitles encoder") );
- set_capability( "encoder", 100 );
- set_callbacks( OpenEncoder, CloseEncoder );
- vlc_module_end();
- static const char *ppsz_enc_options[] = { NULL };
- /****************************************************************************
- * Local structures
- ****************************************************************************
- * Those structures refer closely to the ETSI 300 743 Object model
- ****************************************************************************/
- /* The object definition gives the position of the object in a region */
- typedef struct dvbsub_objectdef_s
- {
- int i_id;
- int i_type;
- int i_x;
- int i_y;
- int i_fg_pc;
- int i_bg_pc;
- } dvbsub_objectdef_t;
- /* The entry in the palette CLUT */
- typedef struct
- {
- uint8_t Y;
- uint8_t Cr;
- uint8_t Cb;
- uint8_t T;
- } dvbsub_color_t;
- /* */
- typedef struct dvbsub_clut_s
- {
- uint8_t i_id;
- uint8_t i_version;
- dvbsub_color_t c_2b[4];
- dvbsub_color_t c_4b[16];
- dvbsub_color_t c_8b[256];
- struct dvbsub_clut_s *p_next;
- } dvbsub_clut_t;
- /* The Region is an aera on the image
- * with a list of the object definitions associated and a CLUT */
- typedef struct dvbsub_region_s
- {
- int i_id;
- int i_version;
- int i_x;
- int i_y;
- int i_width;
- int i_height;
- int i_level_comp;
- int i_depth;
- int i_clut;
- uint8_t *p_pixbuf;
- int i_object_defs;
- dvbsub_objectdef_t *p_object_defs;
- struct dvbsub_region_s *p_next;
- } dvbsub_region_t;
- /* The object definition gives the position of the object in a region */
- typedef struct dvbsub_regiondef_s
- {
- int i_id;
- int i_x;
- int i_y;
- } dvbsub_regiondef_t;
- /* The page defines the list of regions */
- typedef struct
- {
- int i_id;
- int i_timeout;
- int i_state;
- int i_version;
- int i_region_defs;
- dvbsub_regiondef_t *p_region_defs;
- } dvbsub_page_t;
- struct decoder_sys_t
- {
- bs_t bs;
- /* Decoder internal data */
- int i_id;
- int i_ancillary_id;
- mtime_t i_pts;
- dvbsub_page_t *p_page;
- dvbsub_region_t *p_regions;
- dvbsub_clut_t *p_cluts;
- dvbsub_clut_t default_clut;
- };
- // List of different SEGMENT TYPES
- // According to EN 300-743, table 2
- #define DVBSUB_ST_PAGE_COMPOSITION 0x10
- #define DVBSUB_ST_REGION_COMPOSITION 0x11
- #define DVBSUB_ST_CLUT_DEFINITION 0x12
- #define DVBSUB_ST_OBJECT_DATA 0x13
- #define DVBSUB_ST_ENDOFDISPLAY 0x80
- #define DVBSUB_ST_STUFFING 0xff
- // List of different OBJECT TYPES
- // According to EN 300-743, table 6
- #define DVBSUB_OT_BASIC_BITMAP 0x00
- #define DVBSUB_OT_BASIC_CHAR 0x01
- #define DVBSUB_OT_COMPOSITE_STRING 0x02
- // Pixel DATA TYPES
- // According to EN 300-743, table 9
- #define DVBSUB_DT_2BP_CODE_STRING 0x10
- #define DVBSUB_DT_4BP_CODE_STRING 0x11
- #define DVBSUB_DT_8BP_CODE_STRING 0x12
- #define DVBSUB_DT_24_TABLE_DATA 0x20
- #define DVBSUB_DT_28_TABLE_DATA 0x21
- #define DVBSUB_DT_48_TABLE_DATA 0x22
- #define DVBSUB_DT_END_LINE 0xf0
- // List of different Page Composition Segment state
- // According to EN 300-743, 7.2.1 table 3
- #define DVBSUB_PCS_STATE_ACQUISITION 0x01
- #define DVBSUB_PCS_STATE_CHANGE 0x10
- /*****************************************************************************
- * Local prototypes
- *****************************************************************************/
- static void decode_segment( decoder_t *, bs_t * );
- static void decode_page_composition( decoder_t *, bs_t * );
- static void decode_region_composition( decoder_t *, bs_t * );
- static void decode_object( decoder_t *, bs_t * );
- static void decode_clut( decoder_t *, bs_t * );
- static void free_all( decoder_t * );
- static void default_clut_init( decoder_t * );
- static subpicture_t *render( decoder_t * );
- /*****************************************************************************
- * Open: probe the decoder and return score
- *****************************************************************************
- * Tries to launch a decoder and return score so that the interface is able
- * to chose.
- *****************************************************************************/
- static int Open( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t *) p_this;
- decoder_sys_t *p_sys;
- if( p_dec->fmt_in.i_codec != VLC_FOURCC('d','v','b','s') )
- {
- return VLC_EGENERIC;
- }
- p_dec->pf_decode_sub = Decode;
- p_sys = p_dec->p_sys = malloc( sizeof(decoder_sys_t) );
- memset( p_sys, 0, sizeof(decoder_sys_t) );
- p_sys->i_pts = 0;
- p_sys->i_id = p_dec->fmt_in.subs.dvb.i_id & 0xFFFF;
- p_sys->i_ancillary_id = p_dec->fmt_in.subs.dvb.i_id >> 16;
- p_sys->p_regions = NULL;
- p_sys->p_cluts = NULL;
- p_sys->p_page = NULL;
- es_format_Init( &p_dec->fmt_out, SPU_ES, VLC_FOURCC( 'd','v','b','s' ) );
- default_clut_init( p_dec );
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * Close:
- *****************************************************************************/
- static void Close( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t*) p_this;
- decoder_sys_t *p_sys = p_dec->p_sys;
- free_all( p_dec );
- free( p_sys );
- }
- /*****************************************************************************
- * Decode:
- *****************************************************************************/
- static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- block_t *p_block;
- subpicture_t *p_spu = NULL;
- if( pp_block == NULL || *pp_block == NULL ) return NULL;
- p_block = *pp_block;
- *pp_block = NULL;
- p_sys->i_pts = p_block->i_pts;
- if( p_sys->i_pts <= 0 )
- {
- #ifdef DEBUG_DVBSUB
- /* Some DVB channels send stuffing segments in non-dated packets so
- * don't complain too loudly. */
- msg_Warn( p_dec, "non dated subtitle" );
- #endif
- block_Release( p_block );
- return NULL;
- }
- bs_init( &p_sys->bs, p_block->p_buffer, p_block->i_buffer );
- if( bs_read( &p_sys->bs, 8 ) != 0x20 ) /* Data identifier */
- {
- msg_Dbg( p_dec, "invalid data identifier" );
- block_Release( p_block );
- return NULL;
- }
- if( bs_read( &p_sys->bs, 8 ) ) /* Subtitle stream id */
- {
- msg_Dbg( p_dec, "invalid subtitle stream id" );
- block_Release( p_block );
- return NULL;
- }
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "subtitle packet received: "I64Fd, p_sys->i_pts );
- #endif
- while( bs_show( &p_sys->bs, 8 ) == 0x0f ) /* Sync byte */
- {
- decode_segment( p_dec, &p_sys->bs );
- }
- if( bs_read( &p_sys->bs, 8 ) != 0xff ) /* End marker */
- {
- msg_Warn( p_dec, "end marker not found (corrupted subtitle ?)" );
- block_Release( p_block );
- return NULL;
- }
- /* Check if the page is to be displayed */
- if( p_sys->p_page ) p_spu = render( p_dec );
- block_Release( p_block );
- return p_spu;
- }
- /* following functions are local */
- /*****************************************************************************
- * default_clut_init: default clut as defined in EN 300-743 section 10
- *****************************************************************************/
- static void default_clut_init( decoder_t *p_dec )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- uint8_t i;
- #define RGB_TO_Y(r, g, b) ((int16_t) 77 * r + 150 * g + 29 * b) / 256;
- #define RGB_TO_U(r, g, b) ((int16_t) -44 * r - 87 * g + 131 * b) / 256;
- #define RGB_TO_V(r, g, b) ((int16_t) 131 * r - 110 * g - 21 * b) / 256;
- /* 4 entries CLUT */
- for( i = 0; i < 4; i++ )
- {
- uint8_t R = 0, G = 0, B = 0, T = 0;
- if( !(i & 0x2) && !(i & 0x1) ) T = 0xFF;
- else if( !(i & 0x2) && (i & 0x1) ) R = G = B = 0xFF;
- else if( (i & 0x2) && !(i & 0x1) ) R = G = B = 0;
- else R = G = B = 0x7F;
- p_sys->default_clut.c_2b[i].Y = RGB_TO_Y(R,G,B);
- p_sys->default_clut.c_2b[i].Cr = RGB_TO_U(R,G,B);
- p_sys->default_clut.c_2b[i].Cb = RGB_TO_V(R,G,B);
- p_sys->default_clut.c_2b[i].T = T;
- }
- /* 16 entries CLUT */
- for( i = 0; i < 16; i++ )
- {
- uint8_t R = 0, G = 0, B = 0, T = 0;
- if( !(i & 0x8) )
- {
- if( !(i & 0x4) && !(i & 0x2) && !(i & 0x1) )
- {
- T = 0xFF;
- }
- else
- {
- R = (i & 0x1) ? 0xFF : 0;
- G = (i & 0x2) ? 0xFF : 0;
- B = (i & 0x4) ? 0xFF : 0;
- }
- }
- else
- {
- R = (i & 0x1) ? 0x7F : 0;
- G = (i & 0x2) ? 0x7F : 0;
- B = (i & 0x4) ? 0x7F : 0;
- }
- p_sys->default_clut.c_4b[i].Y = RGB_TO_Y(R,G,B);
- p_sys->default_clut.c_4b[i].Cr = RGB_TO_U(R,G,B);
- p_sys->default_clut.c_4b[i].Cb = RGB_TO_V(R,G,B);
- p_sys->default_clut.c_4b[i].T = T;
- }
- /* 256 entries CLUT (TODO) */
- memset( p_sys->default_clut.c_8b, 0xFF, 256 * sizeof(dvbsub_color_t) );
- }
- static void decode_segment( decoder_t *p_dec, bs_t *s )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- int i_type;
- int i_page_id;
- int i_size;
- /* sync_byte (already checked) */
- bs_skip( s, 8 );
- /* segment type */
- i_type = bs_read( s, 8 );
- /* page id */
- i_page_id = bs_read( s, 16 );
- /* segment size */
- i_size = bs_show( s, 16 );
- if( i_page_id != p_sys->i_id && i_page_id != p_sys->i_ancillary_id )
- {
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "subtitle skipped (page id: %i, %i)",
- i_page_id, p_sys->i_id );
- #endif
- bs_skip( s, 8 * ( 2 + i_size ) );
- return;
- }
- #ifdef DEBUG_DVBSUB
- if( i_page_id == p_sys->i_id )
- msg_Dbg( p_dec, "segment (id: %i)", i_page_id );
- else
- msg_Dbg( p_dec, "ancillary segment (id: %i)", i_page_id );
- #endif
- switch( i_type )
- {
- case DVBSUB_ST_PAGE_COMPOSITION:
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "decode_page_composition" );
- #endif
- decode_page_composition( p_dec, s );
- break;
- case DVBSUB_ST_REGION_COMPOSITION:
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "decode_region_composition" );
- #endif
- decode_region_composition( p_dec, s );
- break;
- case DVBSUB_ST_CLUT_DEFINITION:
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "decode_clut" );
- #endif
- decode_clut( p_dec, s );
- break;
- case DVBSUB_ST_OBJECT_DATA:
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "decode_object" );
- #endif
- decode_object( p_dec, s );
- break;
- case DVBSUB_ST_ENDOFDISPLAY:
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "end of display" );
- #endif
- bs_skip( s, 8 * ( 2 + i_size ) );
- break;
- case DVBSUB_ST_STUFFING:
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "skip stuffing" );
- #endif
- bs_skip( s, 8 * ( 2 + i_size ) );
- break;
- default:
- msg_Warn( p_dec, "unsupported segment type: (%04x)", i_type );
- bs_skip( s, 8 * ( 2 + i_size ) );
- break;
- }
- }
- static void decode_clut( decoder_t *p_dec, bs_t *s )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- uint16_t i_segment_length;
- uint16_t i_processed_length;
- dvbsub_clut_t *p_clut, *p_next;
- int i_id, i_version;
- i_segment_length = bs_read( s, 16 );
- i_id = bs_read( s, 8 );
- i_version = bs_read( s, 4 );
- /* Check if we already have this clut */
- for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut->p_next )
- {
- if( p_clut->i_id == i_id ) break;
- }
- /* Check version number */
- if( p_clut && p_clut->i_version == i_version )
- {
- /* Nothing to do */
- bs_skip( s, 8 * i_segment_length - 12 );
- return;
- }
- if( !p_clut )
- {
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "new clut: %i", i_id );
- #endif
- p_clut = malloc( sizeof(dvbsub_clut_t) );
- p_clut->p_next = p_sys->p_cluts;
- p_sys->p_cluts = p_clut;
- }
- /* Initialize to default clut */
- p_next = p_clut->p_next;
- *p_clut = p_sys->default_clut;
- p_clut->p_next = p_next;
- /* We don't have this version of the CLUT: Parse it */
- p_clut->i_version = i_version;
- p_clut->i_id = i_id;
- bs_skip( s, 4 ); /* Reserved bits */
- i_processed_length = 2;
- while( i_processed_length < i_segment_length )
- {
- uint8_t y, cb, cr, t;
- uint8_t i_id;
- uint8_t i_type;
- i_id = bs_read( s, 8 );
- i_type = bs_read( s, 3 );
- bs_skip( s, 4 );
- if( bs_read( s, 1 ) )
- {
- y = bs_read( s, 8 );
- cr = bs_read( s, 8 );
- cb = bs_read( s, 8 );
- t = bs_read( s, 8 );
- i_processed_length += 6;
- }
- else
- {
- y = bs_read( s, 6 ) << 2;
- cr = bs_read( s, 4 ) << 4;
- cb = bs_read( s, 4 ) << 4;
- t = bs_read( s, 2 ) << 6;
- i_processed_length += 4;
- }
- /* We are not entirely compliant here as full transparency is indicated
- * with a luma value of zero, not a transparency value of 0xff
- * (full transparency would actually be 0xff + 1). */
- if( y == 0 )
- {
- cr = cb = 0;
- t = 0xff;
- }
- /* According to EN 300-743 section 7.2.3 note 1, type should
- * not have more than 1 bit set to one, but some streams don't
- * respect this note. */
- if( i_type & 0x04)
- {
- p_clut->c_2b[i_id].Y = y;
- p_clut->c_2b[i_id].Cr = cr;
- p_clut->c_2b[i_id].Cb = cb;
- p_clut->c_2b[i_id].T = t;
- }
- if( i_type & 0x02)
- {
- p_clut->c_4b[i_id].Y = y;
- p_clut->c_4b[i_id].Cr = cr;
- p_clut->c_4b[i_id].Cb = cb;
- p_clut->c_4b[i_id].T = t;
- }
- if( i_type & 0x01)
- {
- p_clut->c_8b[i_id].Y = y;
- p_clut->c_8b[i_id].Cr = cr;
- p_clut->c_8b[i_id].Cb = cb;
- p_clut->c_8b[i_id].T = t;
- }
- }
- }
- static void decode_page_composition( decoder_t *p_dec, bs_t *s )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- int i_version, i_state, i_segment_length, i_timeout, i;
- /* A page is composed by 0 or more region */
- i_segment_length = bs_read( s, 16 );
- i_timeout = bs_read( s, 8 );
- i_version = bs_read( s, 4 );
- i_state = bs_read( s, 2 );
- bs_skip( s, 2 ); /* Reserved */
- if( i_state == DVBSUB_PCS_STATE_CHANGE )
- {
- /* End of an epoch, reset decoder buffer */
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "page composition mode change" );
- #endif
- free_all( p_dec );
- }
- else if( !p_sys->p_page && i_state != DVBSUB_PCS_STATE_ACQUISITION &&
- i_state != DVBSUB_PCS_STATE_CHANGE )
- {
- /* Not a full PCS, we need to wait for one */
- msg_Dbg( p_dec, "didn't receive an acquisition page yet" );
- #if 0 /* Try to start decoding even without an acquisition page */
- bs_skip( s, 8 * (i_segment_length - 2) );
- return;
- #endif
- }
- #ifdef DEBUG_DVBSUB
- if( i_state == DVBSUB_PCS_STATE_ACQUISITION )
- msg_Dbg( p_dec, "acquisition page composition" );
- #endif
- /* Check version number */
- if( p_sys->p_page && p_sys->p_page->i_version == i_version )
- {
- bs_skip( s, 8 * (i_segment_length - 2) );
- return;
- }
- else if( p_sys->p_page )
- {
- if( p_sys->p_page->i_region_defs )
- free( p_sys->p_page->p_region_defs );
- p_sys->p_page->i_region_defs = 0;
- }
- if( !p_sys->p_page )
- {
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "new page" );
- #endif
- /* Allocate a new page */
- p_sys->p_page = malloc( sizeof(dvbsub_page_t) );
- }
- p_sys->p_page->i_version = i_version;
- p_sys->p_page->i_timeout = i_timeout;
- /* Number of regions */
- p_sys->p_page->i_region_defs = (i_segment_length - 2) / 6;
- if( p_sys->p_page->i_region_defs == 0 ) return;
- p_sys->p_page->p_region_defs =
- malloc( p_sys->p_page->i_region_defs * sizeof(dvbsub_region_t) );
- for( i = 0; i < p_sys->p_page->i_region_defs; i++ )
- {
- p_sys->p_page->p_region_defs[i].i_id = bs_read( s, 8 );
- bs_skip( s, 8 ); /* Reserved */
- p_sys->p_page->p_region_defs[i].i_x = bs_read( s, 16 );
- p_sys->p_page->p_region_defs[i].i_y = bs_read( s, 16 );
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "page_composition, region %i (%i,%i)",
- i, p_sys->p_page->p_region_defs[i].i_x,
- p_sys->p_page->p_region_defs[i].i_y );
- #endif
- }
- }
- static void decode_region_composition( decoder_t *p_dec, bs_t *s )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- dvbsub_region_t *p_region, **pp_region = &p_sys->p_regions;
- int i_segment_length, i_processed_length, i_id, i_version;
- int i_width, i_height, i_level_comp, i_depth, i_clut;
- int i_8_bg, i_4_bg, i_2_bg;
- vlc_bool_t b_fill;
- i_segment_length = bs_read( s, 16 );
- i_id = bs_read( s, 8 );
- i_version = bs_read( s, 4 );
- /* Check if we already have this region */
- for( p_region = p_sys->p_regions; p_region != NULL;
- p_region = p_region->p_next )
- {
- pp_region = &p_region->p_next;
- if( p_region->i_id == i_id ) break;
- }
- /* Check version number */
- if( p_region && p_region->i_version == i_version )
- {
- bs_skip( s, 8 * (i_segment_length - 1) - 4 );
- return;
- }
- if( !p_region )
- {
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "new region: %i", i_id );
- #endif
- p_region = *pp_region = malloc( sizeof(dvbsub_region_t) );
- memset( p_region, 0, sizeof(dvbsub_region_t) );
- p_region->p_object_defs = NULL;
- p_region->p_pixbuf = NULL;
- p_region->p_next = NULL;
- }
- /* Region attributes */
- p_region->i_id = i_id;
- p_region->i_version = i_version;
- b_fill = bs_read( s, 1 );
- bs_skip( s, 3 ); /* Reserved */
- i_width = bs_read( s, 16 );
- i_height = bs_read( s, 16 );
- i_level_comp = bs_read( s, 3 );
- i_depth = bs_read( s, 3 );
- bs_skip( s, 2 ); /* Reserved */
- i_clut = bs_read( s, 8 );
- i_8_bg = bs_read( s, 8 );
- i_4_bg = bs_read( s, 4 );
- i_2_bg = bs_read( s, 2 );
- bs_skip( s, 2 ); /* Reserved */
- p_region->i_object_defs = 0;
- /* Extra sanity checks */
- if( p_region->i_width != i_width || p_region->i_height != i_height )
- {
- if( p_region->p_pixbuf )
- {
- msg_Dbg( p_dec, "region size changed (not allowed)" );
- free( p_region->p_pixbuf );
- }
- p_region->p_pixbuf = malloc( i_height * i_width );
- p_region->i_depth = 0;
- b_fill = VLC_TRUE;
- }
- if( p_region->i_depth && (p_region->i_depth != i_depth ||
- p_region->i_level_comp != i_level_comp || p_region->i_clut != i_clut) )
- {
- msg_Dbg( p_dec, "region parameters changed (not allowed)" );
- }
- /* Erase background of region */
- if( b_fill )
- {
- int i_background = (p_region->i_depth == 1) ? i_2_bg :
- (p_region->i_depth == 2) ? i_4_bg : i_8_bg;
- memset( p_region->p_pixbuf, i_background, i_width * i_height );
- }
- p_region->i_width = i_width;
- p_region->i_height = i_height;
- p_region->i_level_comp = i_level_comp;
- p_region->i_depth = i_depth;
- p_region->i_clut = i_clut;
- /* List of objects in the region */
- i_processed_length = 10;
- while( i_processed_length < i_segment_length )
- {
- dvbsub_objectdef_t *p_obj;
- /* We create a new object */
- p_region->i_object_defs++;
- p_region->p_object_defs =
- realloc( p_region->p_object_defs,
- sizeof(dvbsub_objectdef_t) * p_region->i_object_defs );
- /* We parse object properties */
- p_obj = &p_region->p_object_defs[p_region->i_object_defs - 1];
- p_obj->i_id = bs_read( s, 16 );
- p_obj->i_type = bs_read( s, 2 );
- bs_skip( s, 2 ); /* Provider */
- p_obj->i_x = bs_read( s, 12 );
- bs_skip( s, 4 ); /* Reserved */
- p_obj->i_y = bs_read( s, 12 );
- i_processed_length += 6;
- if( p_obj->i_type == DVBSUB_OT_BASIC_CHAR ||
- p_obj->i_type == DVBSUB_OT_COMPOSITE_STRING )
- {
- p_obj->i_fg_pc = bs_read( s, 8 );
- p_obj->i_bg_pc = bs_read( s, 8 );
- i_processed_length += 2;
- }
- }
- }
- static void dvbsub_render_pdata( decoder_t *, dvbsub_region_t *, int, int,
- uint8_t *, int );
- static void dvbsub_pdata2bpp( bs_t *, uint8_t *, int, int * );
- static void dvbsub_pdata4bpp( bs_t *, uint8_t *, int, int * );
- static void dvbsub_pdata8bpp( bs_t *, uint8_t *, int, int * );
- static void decode_object( decoder_t *p_dec, bs_t *s )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- dvbsub_region_t *p_region;
- int i_segment_length, i_coding_method, i_version, i_id, i;
- vlc_bool_t b_non_modify_color;
- i_segment_length = bs_read( s, 16 );
- i_id = bs_read( s, 16 );
- i_version = bs_read( s, 4 );
- i_coding_method = bs_read( s, 2 );
- if( i_coding_method )
- {
- /* TODO: DVB subtitling as characters */
- msg_Dbg( p_dec, "DVB subtitling as characters is not handled!" );
- bs_skip( s, 8 * (i_segment_length - 2) - 6 );
- return;
- }
- /* Check if the object needs to be rendered in at least one
- * of the regions */
- for( p_region = p_sys->p_regions; p_region != NULL;
- p_region = p_region->p_next )
- {
- for( i = 0; i < p_region->i_object_defs; i++ )
- if( p_region->p_object_defs[i].i_id == i_id ) break;
- if( i != p_region->i_object_defs ) break;
- }
- if( !p_region )
- {
- bs_skip( s, 8 * (i_segment_length - 2) - 6 );
- return;
- }
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "new object: %i", i_id );
- #endif
- b_non_modify_color = bs_read( s, 1 );
- bs_skip( s, 1 ); /* Reserved */
- if( i_coding_method == 0x00 )
- {
- int i_topfield, i_bottomfield;
- uint8_t *p_topfield, *p_bottomfield;
- i_topfield = bs_read( s, 16 );
- i_bottomfield = bs_read( s, 16 );
- p_topfield = s->p_start + bs_pos( s ) / 8;
- p_bottomfield = p_topfield + i_topfield;
- bs_skip( s, 8 * (i_segment_length - 7) );
- /* Sanity check */
- if( i_segment_length < i_topfield + i_bottomfield + 7 ||
- p_topfield + i_topfield + i_bottomfield > s->p_end )
- {
- msg_Dbg( p_dec, "corrupted object data" );
- return;
- }
- for( p_region = p_sys->p_regions; p_region != NULL;
- p_region = p_region->p_next )
- {
- for( i = 0; i < p_region->i_object_defs; i++ )
- {
- if( p_region->p_object_defs[i].i_id != i_id ) continue;
- dvbsub_render_pdata( p_dec, p_region,
- p_region->p_object_defs[i].i_x,
- p_region->p_object_defs[i].i_y,
- p_topfield, i_topfield );
- if( i_bottomfield )
- {
- dvbsub_render_pdata( p_dec, p_region,
- p_region->p_object_defs[i].i_x,
- p_region->p_object_defs[i].i_y + 1,
- p_bottomfield, i_bottomfield );
- }
- else
- {
- /* Duplicate the top field */
- dvbsub_render_pdata( p_dec, p_region,
- p_region->p_object_defs[i].i_x,
- p_region->p_object_defs[i].i_y + 1,
- p_topfield, i_topfield );
- }
- }
- }
- }
- else
- {
- /* TODO: DVB subtitling as characters */
- }
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "end object: %i", i_id );
- #endif
- }
- static void dvbsub_render_pdata( decoder_t *p_dec, dvbsub_region_t *p_region,
- int i_x, int i_y,
- uint8_t *p_field, int i_field )
- {
- uint8_t *p_pixbuf;
- int i_offset = 0;
- bs_t bs;
- /* Sanity check */
- if( !p_region->p_pixbuf )
- {
- msg_Err( p_dec, "region %i has no pixel buffer!", p_region->i_id );
- return;
- }
- if( i_y < 0 || i_x < 0 || i_y >= p_region->i_height ||
- i_x >= p_region->i_width )
- {
- msg_Dbg( p_dec, "invalid offset (%i,%i)", i_x, i_y );
- return;
- }
- p_pixbuf = p_region->p_pixbuf + i_y * p_region->i_width;
- bs_init( &bs, p_field, i_field );
- while( !bs_eof( &bs ) )
- {
- /* Sanity check */
- if( i_y >= p_region->i_height ) return;
- switch( bs_read( &bs, 8 ) )
- {
- case 0x10:
- dvbsub_pdata2bpp( &bs, p_pixbuf + i_x, p_region->i_width - i_x,
- &i_offset );
- break;
- case 0x11:
- dvbsub_pdata4bpp( &bs, p_pixbuf + i_x, p_region->i_width - i_x,
- &i_offset );
- break;
- case 0x12:
- dvbsub_pdata8bpp( &bs, p_pixbuf + i_x, p_region->i_width - i_x,
- &i_offset );
- break;
- case 0x20:
- case 0x21:
- case 0x22:
- /* We don't use map tables */
- break;
- case 0xf0: /* End of line code */
- p_pixbuf += 2*p_region->i_width;
- i_offset = 0; i_y += 2;
- break;
- }
- }
- }
- static void dvbsub_pdata2bpp( bs_t *s, uint8_t *p, int i_width, int *pi_off )
- {
- vlc_bool_t b_stop = 0;
- while( !b_stop && !bs_eof( s ) )
- {
- int i_count = 0, i_color = 0;
- if( (i_color = bs_read( s, 2 )) != 0x00 )
- {
- i_count = 1;
- }
- else
- {
- if( bs_read( s, 1 ) == 0x01 ) // Switch1
- {
- i_count = 3 + bs_read( s, 3 );
- i_color = bs_read( s, 2 );
- }
- else
- {
- if( bs_read( s, 1 ) == 0x00 ) //Switch2
- {
- switch( bs_read( s, 2 ) ) //Switch3
- {
- case 0x00:
- b_stop = 1;
- break;
- case 0x01:
- i_count = 2;
- break;
- case 0x02:
- i_count = 12 + bs_read( s, 4 );
- i_color = bs_read( s, 2 );
- break;
- case 0x03:
- i_count = 29 + bs_read( s, 8 );
- i_color = bs_read( s, 2 );
- break;
- default:
- break;
- }
- }
- else
- {
- /* 1 pixel color 0 */
- i_count = 1;
- }
- }
- }
- if( !i_count ) continue;
- /* Sanity check */
- if( i_count + *pi_off > i_width ) break;
- if( i_count == 1 ) p[*pi_off] = i_color;
- else memset( p + *pi_off, i_color, i_count );
- (*pi_off) += i_count;
- }
- bs_align( s );
- }
- static void dvbsub_pdata4bpp( bs_t *s, uint8_t *p, int i_width, int *pi_off )
- {
- vlc_bool_t b_stop = 0;
- while( !b_stop && !bs_eof( s ) )
- {
- int i_count = 0, i_color = 0;
- if( (i_color = bs_read( s, 4 )) != 0x00 )
- {
- /* Add 1 pixel */
- i_count = 1;
- }
- else
- {
- if( bs_read( s, 1 ) == 0x00 ) // Switch1
- {
- if( bs_show( s, 3 ) != 0x00 )
- {
- i_count = 2 + bs_read( s, 3 );
- }
- else
- {
- bs_skip( s, 3 );
- b_stop = 1;
- }
- }
- else
- {
- if( bs_read( s, 1 ) == 0x00) //Switch2
- {
- i_count = 4 + bs_read( s, 2 );
- i_color = bs_read( s, 4 );
- }
- else
- {
- switch ( bs_read( s, 2 ) ) //Switch3
- {
- case 0x0:
- i_count = 1;
- break;
- case 0x1:
- i_count = 2;
- break;
- case 0x2:
- i_count = 9 + bs_read( s, 4 );
- i_color = bs_read( s, 4 );
- break;
- case 0x3:
- i_count= 25 + bs_read( s, 8 );
- i_color = bs_read( s, 4 );
- break;
- }
- }
- }
- }
- if( !i_count ) continue;
- /* Sanity check */
- if( i_count + *pi_off > i_width ) break;
- if( i_count == 1 ) p[*pi_off] = i_color;
- else memset( p + *pi_off, i_color, i_count );
- (*pi_off) += i_count;
- }
- bs_align( s );
- }
- static void dvbsub_pdata8bpp( bs_t *s, uint8_t *p, int i_width, int *pi_off )
- {
- vlc_bool_t b_stop = 0;
- while( !b_stop && !bs_eof( s ) )
- {
- int i_count = 0, i_color = 0;
- if( (i_color = bs_read( s, 8 )) != 0x00 )
- {
- /* Add 1 pixel */
- i_count = 1;
- }
- else
- {
- if( bs_read( s, 1 ) == 0x00 ) // Switch1
- {
- if( bs_show( s, 7 ) != 0x00 )
- {
- i_count = bs_read( s, 7 );
- }
- else
- {
- bs_skip( s, 7 );
- b_stop = 1;
- }
- }
- else
- {
- i_count = bs_read( s, 7 );
- i_color = bs_read( s, 8 );
- }
- }
- if( !i_count ) continue;
- /* Sanity check */
- if( i_count + *pi_off > i_width ) break;
- if( i_count == 1 ) p[*pi_off] = i_color;
- else memset( p + *pi_off, i_color, i_count );
- (*pi_off) += i_count;
- }
- bs_align( s );
- }
- static void free_all( decoder_t *p_dec )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- dvbsub_region_t *p_reg, *p_reg_next;
- dvbsub_clut_t *p_clut, *p_clut_next;
- for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut_next )
- {
- p_clut_next = p_clut->p_next;
- free( p_clut );
- }
- p_sys->p_cluts = NULL;
- for( p_reg = p_sys->p_regions; p_reg != NULL; p_reg = p_reg_next )
- {
- p_reg_next = p_reg->p_next;
- if( p_reg->i_object_defs ) free( p_reg->p_object_defs );
- if( p_reg->p_pixbuf ) free( p_reg->p_pixbuf );
- free( p_reg );
- }
- p_sys->p_regions = NULL;
- if( p_sys->p_page )
- {
- if( p_sys->p_page->i_region_defs )
- free( p_sys->p_page->p_region_defs );
- free( p_sys->p_page );
- }
- p_sys->p_page = NULL;
- }
- static subpicture_t *render( decoder_t *p_dec )
- {
- decoder_sys_t *p_sys = p_dec->p_sys;
- subpicture_t *p_spu;
- subpicture_region_t **pp_spu_region;
- int i, j, i_timeout = 0;
- /* Allocate the subpicture internal data. */
- p_spu = p_dec->pf_spu_buffer_new( p_dec );
- if( !p_spu ) return NULL;
- pp_spu_region = &p_spu->p_region;
- /* Loop on region definitions */
- #ifdef DEBUG_DVBSUB
- if( p_sys->p_page )
- msg_Dbg( p_dec, "rendering %i regions", p_sys->p_page->i_region_defs );
- #endif
- for( i = 0; p_sys->p_page && i < p_sys->p_page->i_region_defs; i++ )
- {
- dvbsub_region_t *p_region;
- dvbsub_regiondef_t *p_regiondef;
- dvbsub_clut_t *p_clut;
- dvbsub_color_t *p_color;
- subpicture_region_t *p_spu_region;
- uint8_t *p_src, *p_dst;
- video_format_t fmt;
- int i_pitch;
- i_timeout = p_sys->p_page->i_timeout;
- p_regiondef = &p_sys->p_page->p_region_defs[i];
- #ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "rendering region %i (%i,%i)", i,
- p_regiondef->i_x, p_regiondef->i_y );
- #endif
- /* Find associated region */
- for( p_region = p_sys->p_regions; p_region != NULL;
- p_region = p_region->p_next )
- {
- if( p_regiondef->i_id == p_region->i_id ) break;
- }
- if( !p_region )
- {
- msg_Dbg( p_dec, "region %i not found", p_regiondef->i_id );
- continue;
- }
- /* Find associated CLUT */
- for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut->p_next )
- {
- if( p_region->i_clut == p_clut->i_id ) break;
- }
- if( !p_clut )
- {
- msg_Dbg( p_dec, "clut %i not found", p_region->i_clut );
- continue;
- }
- /* Create new SPU region */
- memset( &fmt, 0, sizeof(video_format_t) );
- fmt.i_chroma = VLC_FOURCC('Y','U','V','P');
- fmt.i_aspect = VOUT_ASPECT_FACTOR;
- fmt.i_width = fmt.i_visible_width = p_region->i_width;
- fmt.i_height = fmt.i_visible_height = p_region->i_height;
- fmt.i_x_offset = fmt.i_y_offset = 0;
- p_spu_region = p_spu->pf_create_region( VLC_OBJECT(p_dec), &fmt );
- if( !p_region )
- {
- msg_Err( p_dec, "cannot allocate SPU region" );
- continue;
- }
- p_spu_region->i_x = p_regiondef->i_x;
- p_spu_region->i_y = p_regiondef->i_y;
- *pp_spu_region = p_spu_region;
- pp_spu_region = &p_spu_region->p_next;
- /* Build palette */
- fmt.p_palette->i_entries = p_region->i_depth == 1 ? 4 :
- p_region->i_depth == 2 ? 16 : 256;
- p_color = (p_region->i_depth == 1) ? p_clut->c_2b :
- (p_region->i_depth == 2) ? p_clut->c_4b : p_clut->c_8b;
- for( j = 0; j < fmt.p_palette->i_entries; j++ )
- {
- fmt.p_palette->palette[j][0] = p_color[j].Y;
- fmt.p_palette->palette[j][1] = p_color[j].Cr;
- fmt.p_palette->palette[j][2] = p_color[j].Cb;
- fmt.p_palette->palette[j][3] = 0xff - p_color[j].T;
- }
- p_src = p_region->p_pixbuf;
- p_dst = p_spu_region->picture.Y_PIXELS;
- i_pitch = p_spu_region->picture.Y_PITCH;
- /* Copy pixel buffer */
- for( j = 0; j < p_region->i_height; j++ )
- {
- memcpy( p_dst, p_src, p_region->i_width );
- p_src += p_region->i_width;
- p_dst += i_pitch;
- }
- }
- /* Set the pf_render callback */
- p_spu->i_start = p_sys->i_pts;
- p_spu->i_stop = p_spu->i_start + i_timeout * 1000000;
- p_spu->b_ephemer = VLC_TRUE;
- return p_spu;
- }
- /*****************************************************************************
- * encoder_sys_t : encoder descriptor
- *****************************************************************************/
- typedef struct encoder_region_t
- {
- int i_width;
- int i_height;
- } encoder_region_t;
- struct encoder_sys_t
- {
- unsigned int i_page_ver;
- unsigned int i_region_ver;
- unsigned int i_clut_ver;
- int i_regions;
- encoder_region_t *p_regions;
- mtime_t i_pts;
- };
- static void encode_page_composition( encoder_t *, bs_t *, subpicture_t * );
- static void encode_clut( encoder_t *, bs_t *, subpicture_t * );
- static void encode_region_composition( encoder_t *, bs_t *, subpicture_t * );
- static void encode_object( encoder_t *, bs_t *, subpicture_t * );
- /*****************************************************************************
- * OpenEncoder: probe the encoder and return score
- *****************************************************************************/
- static int OpenEncoder( vlc_object_t *p_this )
- {
- encoder_t *p_enc = (encoder_t *)p_this;
- encoder_sys_t *p_sys;
- if( p_enc->fmt_out.i_codec != VLC_FOURCC('d','v','b','s') &&
- !p_enc->b_force )
- {
- return VLC_EGENERIC;
- }
- /* Allocate the memory needed to store the decoder's structure */
- if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
- {
- msg_Err( p_enc, "out of memory" );
- return VLC_EGENERIC;
- }
- p_enc->p_sys = p_sys;
- p_enc->pf_encode_sub = Encode;
- p_enc->fmt_out.i_codec = VLC_FOURCC('d','v','b','s');
- p_enc->fmt_out.subs.dvb.i_id = 1 << 16 | 1;
- sout_CfgParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
- p_sys->i_page_ver = 0;
- p_sys->i_region_ver = 0;
- p_sys->i_clut_ver = 0;
- p_sys->i_regions = 0;
- p_sys->p_regions = 0;
- return VLC_SUCCESS;
- }
- /****************************************************************************
- * Encode: the whole thing
- ****************************************************************************/
- static block_t *Encode( encoder_t *p_enc, subpicture_t *p_subpic )
- {
- bs_t bits, *s = &bits;
- block_t *p_block;
- if( !p_subpic || !p_subpic->p_region ) return 0;
- msg_Dbg( p_enc, "encoding subpicture" );
- p_block = block_New( p_enc, 64000 );
- bs_init( s, p_block->p_buffer, p_block->i_buffer );
- bs_write( s, 8, 0x20 ); /* Data identifier */
- bs_write( s, 8, 0x0 ); /* Subtitle stream id */
- encode_page_composition( p_enc, s, p_subpic );
- encode_region_composition( p_enc, s, p_subpic );
- encode_clut( p_enc, s, p_subpic );
- encode_object( p_enc, s, p_subpic );
- /* End of display */
- bs_write( s, 8, 0x0f ); /* Sync byte */
- bs_write( s, 8, DVBSUB_ST_ENDOFDISPLAY ); /* Segment type */
- bs_write( s, 16, 1 ); /* Page id */
- bs_write( s, 16, 0 ); /* Segment length */
- bs_write( s, 8, 0xff ); /* End marker */
- p_block->i_buffer = bs_pos( s ) / 8;
- p_block->i_pts = p_block->i_dts = p_subpic->i_start;
- if( !p_subpic->b_ephemer && p_subpic->i_stop > p_subpic->i_start )
- {
- block_t *p_block_stop;
- p_block->i_length = p_subpic->i_stop - p_subpic->i_start;
- /* Send another (empty) subtitle to signal the end of display */
- p_block_stop = block_New( p_enc, 64000 );
- bs_init( s, p_block_stop->p_buffer, p_block_stop->i_buffer );
- bs_write( s, 8, 0x20 ); /* Data identifier */
- bs_write( s, 8, 0x0 ); /* Subtitle stream id */
- encode_page_composition( p_enc, s, 0 );
- bs_write( s, 8, 0x0f ); /* Sync byte */
- bs_write( s, 8, DVBSUB_ST_ENDOFDISPLAY ); /* Segment type */
- bs_write( s, 16, 1 ); /* Page id */
- bs_write( s, 16, 0 ); /* Segment length */
- bs_write( s, 8, 0xff ); /* End marker */
- p_block_stop->i_buffer = bs_pos( s ) / 8;
- p_block_stop->i_pts = p_block_stop->i_dts = p_subpic->i_stop;
- block_ChainAppend( &p_block, p_block_stop );
- p_block_stop->i_length = 100000;//p_subpic->i_stop - p_subpic->i_start;
- }
- msg_Dbg( p_enc, "subpicture encoded properly" );
- return p_block;
- }
- /*****************************************************************************
- * CloseEncoder: encoder destruction
- *****************************************************************************/
- static void CloseEncoder( vlc_object_t *p_this )
- {
- encoder_t *p_enc = (encoder_t *)p_this;
- encoder_sys_t *p_sys = p_enc->p_sys;
- if( p_sys->i_regions ) free( p_sys->p_regions );
- free( p_sys );
- }
- static void encode_page_composition( encoder_t *p_enc, bs_t *s,
- subpicture_t *p_subpic )
- {
- encoder_sys_t *p_sys = p_enc->p_sys;
- subpicture_region_t *p_region;
- vlc_bool_t b_mode_change = VLC_FALSE;
- int i_regions, i_timeout;
- bs_write( s, 8, 0x0f ); /* Sync byte */
- bs_write( s, 8, DVBSUB_ST_PAGE_COMPOSITION ); /* Segment type */
- bs_write( s, 16, 1 ); /* Page id */
- for( i_regions = 0, p_region = p_subpic ? p_subpic->p_region : 0;
- p_region; p_region = p_region->p_next, i_regions++ )
- {
- if( i_regions >= p_sys->i_regions )
- {
- encoder_region_t region;
- region.i_width = region.i_height = 0;
- p_sys->p_regions =
- realloc( p_sys->p_regions, sizeof(encoder_region_t) *
- (p_sys->i_regions + 1) );
- p_sys->p_regions[p_sys->i_regions++] = region;
- }
- if( p_sys->p_regions[i_regions].i_width <
- (int)p_region->fmt.i_visible_width )
- {
- b_mode_change = VLC_TRUE;
- msg_Dbg( p_enc, "region %i width change: %i -> %i",
- i_regions, p_sys->p_regions[i_regions].i_width,
- p_region->fmt.i_visible_width );
- p_sys->p_regions[i_regions].i_width =
- p_region->fmt.i_visible_width;
- }
- if( p_sys->p_regions[i_regions].i_height <
- (int)p_region->fmt.i_visible_height )
- {
- b_mode_change = VLC_TRUE;
- msg_Dbg( p_enc, "region %i height change: %i -> %i",
- i_regions, p_sys->p_regions[i_regions].i_height,
- p_region->fmt.i_visible_height );
- p_sys->p_regions[i_regions].i_height =
- p_region->fmt.i_visible_height;
- }
- }
- bs_write( s, 16, i_regions * 6 + 2 ); /* Segment length */
- i_timeout = 0;
- if( p_subpic && !p_subpic->b_ephemer &&
- p_subpic->i_stop > p_subpic->i_start )
- {
- i_timeout = (p_subpic->i_stop - p_subpic->i_start) / 1000000;
- }
- bs_write( s, 8, i_timeout + 15 ); /* Timeout */
- bs_write( s, 4, p_sys->i_page_ver++ );
- bs_write( s, 2, b_mode_change ?
- DVBSUB_PCS_STATE_CHANGE : DVBSUB_PCS_STATE_ACQUISITION );
- bs_write( s, 2, 0 ); /* Reserved */
- for( i_regions = 0, p_region = p_subpic ? p_subpic->p_region : 0;
- p_region; p_region = p_region->p_next, i_regions++ )
- {
- bs_write( s, 8, i_regions );
- bs_write( s, 8, 0 ); /* Reserved */
- bs_write( s, 16, p_region->i_x );
- bs_write( s, 16, p_region->i_y );
- }
- }
- static void encode_clut( encoder_t *p_enc, bs_t *s, subpicture_t *p_subpic )
- {
- encoder_sys_t *p_sys = p_enc->p_sys;
- subpicture_region_t *p_region = p_subpic->p_region;
- video_palette_t *p_pal;
- int i;
- /* Sanity check */
- if( !p_region || !p_region->fmt.p_palette ||
- p_region->fmt.i_chroma != VLC_FOURCC('Y','U','V','P') ) return;
- bs_write( s, 8, 0x0f ); /* Sync byte */
- bs_write( s, 8, DVBSUB_ST_CLUT_DEFINITION ); /* Segment type */
- bs_write( s, 16, 1 ); /* Page id */
- p_pal = p_region->fmt.p_palette;
- bs_write( s, 16, p_pal->i_entries * 6 + 2 ); /* Segment length */
- bs_write( s, 8, 1 ); /* Clut id */
- bs_write( s, 4, p_sys->i_clut_ver++ );
- bs_write( s, 4, 0 ); /* Reserved */
- for( i = 0; i < p_pal->i_entries; i++ )
- {
- bs_write( s, 8, i ); /* Clut entry id */
- bs_write( s, 1, p_pal->i_entries == 4 ); /* 2bit/entry flag */
- bs_write( s, 1, p_pal->i_entries == 16 ); /* 4bit/entry flag */
- bs_write( s, 1, p_pal->i_entries == 256 ); /* 8bit/entry flag */
- bs_write( s, 4, 0 ); /* Reserved */
- bs_write( s, 1, 1 ); /* Full range flag */
- bs_write( s, 8, p_pal->palette[i][3] ? /* Y value */
- (p_pal->palette[i][0] ? p_pal->palette[i][0] : 16) : 0 );
- bs_write( s, 8, p_pal->palette[i][1] ); /* Cr value */
- bs_write( s, 8, p_pal->palette[i][2] ); /* Cb value */
- bs_write( s, 8, 0xff - p_pal->palette[i][3] ); /* T value */
- }
- }
- static void encode_region_composition( encoder_t *p_enc, bs_t *s,
- subpicture_t *p_subpic )
- {
- encoder_sys_t *p_sys = p_enc->p_sys;
- subpicture_region_t *p_region;
- int i_region, i_bg;
- for( i_region = 0, p_region = p_subpic->p_region; p_region;
- p_region = p_region->p_next, i_region++ )
- {
- video_palette_t *p_pal = p_region->fmt.p_palette;
- int i_depth = p_pal->i_entries == 4 ? 0x1 :
- p_pal->i_entries == 16 ? 0x2 : 0x3;
- for( i_bg = 0; i_bg < p_pal->i_entries; i_bg++ )
- {
- if( !p_pal->palette[i_bg][3] ) break;
- }
- bs_write( s, 8, 0x0f ); /* Sync byte */
- bs_write( s, 8, DVBSUB_ST_REGION_COMPOSITION ); /* Segment type */
- bs_write( s, 16, 1 ); /* Page id */
- bs_write( s, 16, 10 + 6 ); /* Segment length */
- bs_write( s, 8, i_region );
- bs_write( s, 4, p_sys->i_region_ver++ );
- /* Region attributes */
- bs_write( s, 1, i_bg < p_pal->i_entries ); /* Fill */
- bs_write( s, 3, 0 ); /* Reserved */
- bs_write( s, 16, p_sys->p_regions[i_region].i_width );
- bs_write( s, 16, p_sys->p_regions[i_region].i_height );
- bs_write( s, 3, i_depth ); /* Region level of compatibility */
- bs_write( s, 3, i_depth ); /* Region depth */
- bs_write( s, 2, 0 ); /* Reserved */
- bs_write( s, 8, 1 ); /* Clut id */
- bs_write( s, 8, i_bg ); /* region 8bit pixel code */
- bs_write( s, 4, i_bg ); /* region 4bit pixel code */
- bs_write( s, 2, i_bg ); /* region 2bit pixel code */
- bs_write( s, 2, 0 ); /* Reserved */
- /* In our implementation we only have 1 object per region */
- bs_write( s, 16, i_region );
- bs_write( s, 2, DVBSUB_OT_BASIC_BITMAP );
- bs_write( s, 2, 0 ); /* object provider flag */
- bs_write( s, 12, 0 ); /* object horizontal position */
- bs_write( s, 4, 0 ); /* Reserved */
- bs_write( s, 12, 0 ); /* object vertical position */
- }
- }
- static void encode_pixel_data( encoder_t *p_enc, bs_t *s,
- subpicture_region_t *p_region,
- vlc_bool_t b_top );
- static void encode_object( encoder_t *p_enc, bs_t *s, subpicture_t *p_subpic )
- {
- encoder_sys_t *p_sys = p_enc->p_sys;
- subpicture_region_t *p_region;
- int i_region;
- int i_length_pos, i_update_pos, i_pixel_data_pos;
- for( i_region = 0, p_region = p_subpic->p_region; p_region;
- p_region = p_region->p_next, i_region++ )
- {
- bs_write( s, 8, 0x0f ); /* Sync byte */
- bs_write( s, 8, DVBSUB_ST_OBJECT_DATA ); /* Segment type */
- bs_write( s, 16, 1 ); /* Page id */
- i_length_pos = bs_pos( s );
- bs_write( s, 16, 0 ); /* Segment length */
- bs_write( s, 16, i_region ); /* Object id */
- bs_write( s, 4, p_sys->i_region_ver++ );
- bs_write( s, 2, 0 ); /* object coding method */
- bs_write( s, 1, 0 ); /* non modifying color flag */
- bs_write( s, 1, 0 ); /* Reserved */
- i_update_pos = bs_pos( s );
- bs_write( s, 16, 0 ); /* topfield data block length */
- bs_write( s, 16, 0 ); /* bottomfield data block length */
- /* Top field */
- i_pixel_data_pos = bs_pos( s );
- encode_pixel_data( p_enc, s, p_region, VLC_TRUE );
- i_pixel_data_pos = ( bs_pos( s ) - i_pixel_data_pos ) / 8;
- SetWBE( &s->p_start[i_update_pos/8], i_pixel_data_pos );
- /* Bottom field */
- i_pixel_data_pos = bs_pos( s );
- encode_pixel_data( p_enc, s, p_region, VLC_FALSE );
- i_pixel_data_pos = ( bs_pos( s ) - i_pixel_data_pos ) / 8;
- SetWBE( &s->p_start[i_update_pos/8+2], i_pixel_data_pos );
- /* Stuffing for word alignment */
- bs_align_0( s );
- if( bs_pos( s ) % 16 ) bs_write( s, 8, 0 );
- /* Update segment length */
- SetWBE( &s->p_start[i_length_pos/8], (bs_pos(s) - i_length_pos)/8 -2 );
- }
- }
- static void encode_pixel_line_2bp( encoder_t *p_enc, bs_t *s,
- subpicture_region_t *p_region,
- int i_line );
- static void encode_pixel_line_4bp( encoder_t *p_enc, bs_t *s,
- subpicture_region_t *p_region,
- int i_line );
- static void encode_pixel_data( encoder_t *p_enc, bs_t *s,
- subpicture_region_t *p_region,
- vlc_bool_t b_top )
- {
- unsigned int i_line;
- /* Sanity check */
- if( p_region->fmt.i_chroma != VLC_FOURCC('Y','U','V','P') ) return;
- /* Encode line by line */
- for( i_line = !b_top; i_line < p_region->fmt.i_visible_height;
- i_line += 2 )
- {
- switch( p_region->fmt.p_palette->i_entries )
- {
- case 4:
- bs_write( s, 8, 0x10 ); /* 2 bit/pixel code string */
- encode_pixel_line_2bp( p_enc, s, p_region, i_line );
- break;
- case 16:
- bs_write( s, 8, 0x11 ); /* 4 bit/pixel code string */
- encode_pixel_line_4bp( p_enc, s, p_region, i_line );
- break;
- default:
- msg_Err( p_enc, "subpicture palette (%i) not handled",
- p_region->fmt.p_palette->i_entries );
- break;
- }
- bs_write( s, 8, 0xf0 ); /* End of object line code */
- }
- }
- static void encode_pixel_line_2bp( encoder_t *p_enc, bs_t *s,
- subpicture_region_t *p_region,
- int i_line )
- {
- unsigned int i, i_length = 0;
- int i_pitch = p_region->picture.p->i_pitch;
- uint8_t *p_data = &p_region->picture.p->p_pixels[ i_pitch * i_line ];
- int i_last_pixel = p_data[0];
- for( i = 0; i <= p_region->fmt.i_visible_width; i++ )
- {
- if( i != p_region->fmt.i_visible_width &&
- p_data[i] == i_last_pixel && i_length != 284 )
- {
- i_length++;
- continue;
- }
- if( i_length == 1 || i_length == 11 || i_length == 28 )
- {
- /* 2bit/pixel code */
- if( i_last_pixel ) bs_write( s, 2, i_last_pixel );
- else
- {
- bs_write( s, 2, 0 );
- bs_write( s, 1, 0 );
- bs_write( s, 1, 1 ); /* pseudo color 0 */
- }
- i_length--;
- }
- if( i_length == 2 )
- {
- if( i_last_pixel )
- {
- bs_write( s, 2, i_last_pixel );
- bs_write( s, 2, i_last_pixel );
- }
- else
- {
- bs_write( s, 2, 0 );
- bs_write( s, 1, 0 );
- bs_write( s, 1, 0 );
- bs_write( s, 2, 1 ); /* 2 * pseudo color 0 */
- }
- }
- else if( i_length > 2 )
- {
- bs_write( s, 2, 0 );
- if( i_length <= 10 )
- {
- bs_write( s, 1, 1 );
- bs_write( s, 3, i_length - 3 );
- bs_write( s, 2, i_last_pixel );
- }
- else
- {
- bs_write( s, 1, 0 );
- bs_write( s, 1, 0 );
- if( i_length <= 27 )
- {
- bs_write( s, 2, 2 );
- bs_write( s, 4, i_length - 12 );
- bs_write( s, 2, i_last_pixel );
- }
- else
- {
- bs_write( s, 2, 3 );
- bs_write( s, 8, i_length - 29 );
- bs_write( s, 2, i_last_pixel );
- }
- }
- }
- if( i == p_region->fmt.i_visible_width ) break;
- i_last_pixel = p_data[i];
- i_length = 1;
- }
- /* Stop */
- bs_write( s, 2, 0 );
- bs_write( s, 1, 0 );
- bs_write( s, 1, 0 );
- bs_write( s, 2, 0 );
- /* Stuffing */
- bs_align_0( s );
- }
- static void encode_pixel_line_4bp( encoder_t *p_enc, bs_t *s,
- subpicture_region_t *p_region,
- int i_line )
- {
- unsigned int i, i_length = 0;
- int i_pitch = p_region->picture.p->i_pitch;
- uint8_t *p_data = &p_region->picture.p->p_pixels[ i_pitch * i_line ];
- int i_last_pixel = p_data[0];
- for( i = 0; i <= p_region->fmt.i_visible_width; i++ )
- {
- if( i != p_region->fmt.i_visible_width &&
- p_data[i] == i_last_pixel && i_length != 1 )
- {
- i_length++;
- continue;
- }
- if( i_length == 1 )
- {
- /* 4bit/pixel code */
- if( i_last_pixel ) bs_write( s, 4, i_last_pixel );
- else
- {
- bs_write( s, 4, 0 );
- bs_write( s, 1, 1 );
- bs_write( s, 1, 1 );
- bs_write( s, 2, 0 ); /* pseudo color 0 */
- }
- }
- if( i == p_region->fmt.i_visible_width ) break;
- i_last_pixel = p_data[i];
- i_length = 1;
- }
- /* Stop */
- bs_write( s, 8, 0 );
- /* Stuffing */
- bs_align_0( s );
- }