* DVB subtitles encoder (developed for Anevia, www.anevia.com)
*****************************************************************************
* Copyright (C) 2003 ANEVIA
- * Copyright (C) 2003-2005 the VideoLAN team
+ * Copyright (C) 2003-2009 the VideoLAN team
* $Id$
*
* Authors: Gildas Bazin <gbazin@videolan.org>
* Laurent Aimar <fenrir@via.ecp.fr>
* Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
* Derk-Jan Hartman <hartman #at# videolan dot org>
+ * Simon Hailes <simon _a_ screen.subtitling.com>
*
* 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
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
+
/*****************************************************************************
* Preamble
*
* refers to the character index in the codepage belonging to the language specified
* in the subtitle descriptor. Potentially it's designed for widechar
* (but not for UTF-*) codepages.
- *****************************************************************************/
+ *****************************************************************************
+ *
+ *****************************************************************************
+ * Notes on DDS (Display Definition Segment)
+ * DDS (Display Definition Segment) tells the decoder how the subtitle image relates to
+ * the video image.
+ * For SD, the subtitle image is always considered to be for display at 720x576
+ * (although it's assumed that for NTSC, this is 720x480, this is not documented well)
+ * Also, for SD, the subtitle image is drawn 'on the glass' (i.e. after video scaling,
+ + * letterbox, etc.)
+ * For 'HD' (subs marked type 0x14/0x24 in PSI), a DDS must be present, and the subs area
+ * is drawn onto the video area (scales if necessary). The DDS tells the decoder what
+ * resolution the subtitle images were intended for, and hence how to scale the subtitle
+ * images for a particular video size
+ * i.e. if HD video is presented as letterbox, the subs will
+ * be in the same place on the video as if the video was presented on an HD set
+ * indeed, if the HD video was pillarboxed by the decoder, the subs may be cut off as
+ * well as the video. The intent here is that the subs can be placed accurately on the video
+ * - somthing which was missed in the original spec.
+ *
+ * A DDS may also specify a window - this is where the subs images are moved so that the (0,0)
+ * origin of decode is offset.
+ ********************************************************************************************/
+
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_codec.h>
#include <vlc_sout.h>
-#include "vlc_bits.h"
+#include <vlc_bits.h>
/* #define DEBUG_DVBSUB 1 */
int i_width;
int i_height;
- bool b_windowed;
+ bool b_windowed;
+ /* these values are only relevant if windowed */
int i_x;
int i_y;
int i_max_x;
struct decoder_sys_t
{
- bs_t bs;
+ bs_t bs;
/* Decoder internal data */
- int i_id;
- int i_ancillary_id;
- mtime_t i_pts;
-
- bool b_absolute;
- int i_spu_position;
- int i_spu_x;
- int i_spu_y;
-
- bool b_page;
- dvbsub_page_t *p_page;
- dvbsub_region_t *p_regions;
- dvbsub_clut_t *p_cluts;
- dvbsub_display_t *p_display;
- dvbsub_clut_t default_clut;
+ int i_id;
+ int i_ancillary_id;
+ mtime_t i_pts;
+
+ bool b_absolute;
+ int i_spu_position;
+ int i_spu_x;
+ int i_spu_y;
+
+ bool b_page;
+ dvbsub_page_t *p_page;
+ dvbsub_region_t *p_regions;
+ dvbsub_clut_t *p_cluts;
+ /* this is very small, so keep forever */
+ dvbsub_display_t display;
+ dvbsub_clut_t default_clut;
};
static void free_all( decoder_t * );
static void default_clut_init( decoder_t * );
+static void default_dds_init( decoder_t * );
static subpicture_t *render( decoder_t * );
p_sys->p_regions = NULL;
p_sys->p_cluts = NULL;
p_sys->p_page = NULL;
- p_sys->p_display = NULL;
+
+ /* configure for SD res in case DDS is not present */
+ default_dds_init( p_dec );
var_Create( p_this, DVBSUB_CFG_PREFIX "position",
VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
p_block = *pp_block;
*pp_block = NULL;
+ /* configure for SD res in case DDS is not present */
+ /* a change of PTS is a good indication we must get a new DDS */
+ if (p_sys->i_pts != p_block->i_pts)
+ default_dds_init( p_dec );
+
p_sys->i_pts = p_block->i_pts;
if( p_sys->i_pts <= 0 )
{
decoder_sys_t *p_sys = p_dec->p_sys;
uint16_t i_segment_length;
uint16_t i_processed_length = 40;
- dvbsub_display_t *p_display;
- dvbsub_display_t *p_old = p_sys->p_display;
int i_version;
i_segment_length = bs_read( s, 16 );
i_version = bs_read( s, 4 );
/* Check version number */
- if( p_old && ( p_old->i_version == i_version ) )
+ if( p_sys->display.i_version == i_version )
{
/* The definition did not change */
bs_skip( s, 8*i_segment_length - 4 );
#ifdef DEBUG_DVBSUB
msg_Dbg( p_dec, "new display definition: %i", i_version );
#endif
- p_display = malloc( sizeof(dvbsub_display_t) );
- if( p_display )
- {
- /* We don't have this version of the display definition: Parse it */
- p_display->i_version = i_version;
- p_display->b_windowed = bs_read( s, 1 );
- bs_skip( s, 3 ); /* Reserved bits */
- p_display->i_width = bs_read( s, 16 )+1;
- p_display->i_height = bs_read( s, 16 )+1;
- if( p_display->b_windowed )
- {
+ /* We don't have this version of the display definition: Parse it */
+ p_sys->display.i_version = i_version;
+ p_sys->display.b_windowed = bs_read( s, 1 );
+ bs_skip( s, 3 ); /* Reserved bits */
+ p_sys->display.i_width = bs_read( s, 16 )+1;
+ p_sys->display.i_height = bs_read( s, 16 )+1;
+
+ if( p_sys->display.b_windowed )
+ {
#ifdef DEBUG_DVBSUB
- msg_Dbg( p_dec, "display definition with offsets (windowed)" );
+ msg_Dbg( p_dec, "display definition with offsets (windowed)" );
#endif
- /* Coordinates are measured from the top left corner */
- p_display->i_x = bs_read( s, 16 );
- p_display->i_max_x = bs_read( s, 16 );
- p_display->i_y = bs_read( s, 16 );
- p_display->i_max_y = bs_read( s, 16 );
- i_processed_length += 64;
- }
+ /* Coordinates are measured from the top left corner */
+ p_sys->display.i_x = bs_read( s, 16 );
+ p_sys->display.i_max_x = bs_read( s, 16 );
+ p_sys->display.i_y = bs_read( s, 16 );
+ p_sys->display.i_max_y = bs_read( s, 16 );
+ i_processed_length += 64;
+ }
+ else
+ {
+ /* if not windowed, setup the window variables to good defaults */
+ /* not necessary, but to avoid future confusion.. */
+ p_sys->display.i_x = 0;
+ p_sys->display.i_max_x = p_sys->display.i_width-1;
+ p_sys->display.i_y = 0;
+ p_sys->display.i_max_y = p_sys->display.i_height-1;
}
-
- p_sys->p_display = p_display;
- free( p_old );
if( i_processed_length != i_segment_length*8 )
{
- msg_Err( p_dec, "processed length %d != segment length %d",
- i_processed_length, i_segment_length );
+ msg_Err( p_dec, "processed length %d bytes != segment length %d bytes",
+ i_processed_length / 8 , i_segment_length );
}
#ifdef DEBUG_DVBSUB
msg_Dbg( p_dec, "version: %d, width: %d, height: %d",
- p_display->i_version, p_display->i_width, p_display->i_height );
- if( p_display->b_windowed )
+ p_sys->display.i_version, p_sys->display.i_width, p_sys->display.i_height );
+ if( p_sys->display.b_windowed )
msg_Dbg( p_dec, "xmin: %d, xmax: %d, ymin: %d, ymax: %d",
- p_display->i_x, p_display->i_max_x, p_display->i_y, p_display->i_max_y );
+ p_sys->display.i_x, p_sys->display.i_max_x, p_sys->display.i_y, p_sys->display.i_max_y );
#endif
}
dvbsub_region_t *p_reg, *p_reg_next;
dvbsub_clut_t *p_clut, *p_clut_next;
- free( p_sys->p_display );
+ /*free( p_sys->p_display ); No longer malloced */
for( p_clut = p_sys->p_cluts; p_clut != NULL; p_clut = p_clut_next )
{
p_spu->i_original_picture_width = 720;
p_spu->i_original_picture_height = 576;
- if( p_sys->p_display )
+ p_spu->i_original_picture_width = p_sys->display.i_width;
+ p_spu->i_original_picture_height = p_sys->display.i_height;
+
+ if( p_sys->display.b_windowed )
{
- p_spu->i_original_picture_width = p_sys->p_display->i_width;
- p_spu->i_original_picture_height = p_sys->p_display->i_height;
+ /* From en_300743v01 - */
+ /* the DDS is there to indicate intended size/position of text */
+ /* the intended video area is ->i_width/height */
+ /* the window is within this... SO... we should leave i_original_picture_width etc. as is */
+ /* and ONLY change i_base_x. effectively i_max_x/y are only there to limit memory requirements*/
+ /* we COULD use the upper limits to limit rendering to within these? */
- if( p_sys->p_display->b_windowed )
- {
- /* TODO: check that this actually works */
- p_spu->i_original_picture_width = p_sys->p_display->i_max_x - p_sys->p_display->i_x;
- p_spu->i_original_picture_height = p_sys->p_display->i_max_y - p_sys->p_display->i_y;
- i_base_x += p_sys->p_display->i_x;
- i_base_y += p_sys->p_display->i_y;
- }
+ /* see notes on DDS at the top of the file */
+ i_base_x += p_sys->display.i_x;
+ i_base_y += p_sys->display.i_y;
}
pp_spu_region = &p_spu->p_region;
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;
}
+#ifdef DEBUG_DVBSUB
+ /* if a region exists, then print it's size */
+ if (p_region)
+ {
+ msg_Dbg( p_dec, "rendering region %i (%i,%i) to (%i,%i)", i,
+ p_regiondef->i_x, p_regiondef->i_y,
+ p_regiondef->i_x + p_region->i_width,
+ p_regiondef->i_y + p_region->i_height );
+ }
+ else
+ {
+ msg_Dbg( p_dec, "rendering region %i (%i,%i) (no region matched to render)", i,
+ p_regiondef->i_x, p_regiondef->i_y );
+ }
+#endif
+
if( !p_region )
{
msg_Dbg( p_dec, "region %i not found", p_regiondef->i_id );
continue;
}
- /* FIXME: don't create a subpicture region with VLC CODEC YUVP
+ /* FIXME: don't create a subpicture region with VLC CODEC YUVP
* when it actually is a TEXT region */
/* Create new SPU region */
+ p_region->p_picture->p[0].i_pitch * 1 / 3;
int i_tolerance = 0;
-#ifdef DEBUG_DVBSUB
+#ifdef DEBUG_DVBSUB1
+ /* p_enc not valid here */
msg_Dbg( p_enc, "YuvaYuvp: i_pixels=%d, i_iterator=%d", i_pixels, i_iterator );
#endif
p_fmt->i_chroma = VLC_CODEC_YUVP;
}
}
-#ifdef DEBUG_DVBSUB
+#ifdef DEBUG_DVBSUB1
+ /* p_enc not valid here */
msg_Dbg( p_enc, "best palette has %d colors", p_fmt->p_palette->i_entries );
#endif
p_fmt->p_palette->palette[i][3] = 0;
}
p_fmt->p_palette->i_entries = i_max_entries;
-#ifdef DEBUG_DVBSUB
+#ifdef DEBUG_DVBSUB1
+ /* p_enc not valid here */
msg_Dbg( p_enc, "best palette has %d colors", p_fmt->p_palette->i_entries );
#endif
}
/* Stuffing */
bs_align_0( s );
}
+
+
+static void default_dds_init( decoder_t * p_dec )
+{
+ decoder_sys_t *p_sys = p_dec->p_sys;
+
+ /* see notes on DDS at the top of the file */
+
+ /* configure for SD res in case DDS is not present */
+ p_sys->display.i_version = 0xff; /* an invalid version so it's always different */
+ p_sys->display.i_width = 720;
+ p_sys->display.i_height = 576;
+ p_sys->display.b_windowed = false;
+}
+
projects / vlc / blobdiff