Simplify the creation of subpicture with dynamic content.

include/vlc_codec.h

@@ -109,7 +109,7 @@ struct decoder_t
 
     /* SPU output callbacks
      * XXX use decoder_NewSubpicture and decoder_DeleteSubpicture */
-    subpicture_t   *(*pf_spu_buffer_new)( decoder_t * );
+    subpicture_t   *(*pf_spu_buffer_new)( decoder_t *, const subpicture_updater_t * );
     void            (*pf_spu_buffer_del)( decoder_t *, subpicture_t * );
 
     /* Input attachments
@@ -216,7 +216,7 @@ VLC_EXPORT( void, decoder_DeleteAudioBuffer, ( decoder_t *, aout_buffer_t *p_buf
  * buffer. You have to release it using decoder_DeleteSubpicture or by returning
  * it to the caller as a pf_decode_sub return value.
  */
-VLC_EXPORT( subpicture_t *, decoder_NewSubpicture, ( decoder_t * ) LIBVLC_USED );
+VLC_EXPORT( subpicture_t *, decoder_NewSubpicture, ( decoder_t *, const subpicture_updater_t * ) LIBVLC_USED );
 
 /**
  * This function will release a subpicture created by decoder_NewSubicture.

include/vlc_subpicture.h

@@ -102,6 +102,26 @@ VLC_EXPORT( void, subpicture_region_Delete, ( subpicture_region_t *p_region ) );
  */
 VLC_EXPORT( void, subpicture_region_ChainDelete, ( subpicture_region_t *p_head ) );
 
+/**
+ *
+ */
+typedef struct subpicture_updater_sys_t subpicture_updater_sys_t;
+typedef struct
+{
+    int  (*pf_validate)( subpicture_t *,
+                         bool has_src_changed, const video_format_t *p_fmt_src,
+                         bool has_dst_changed, const video_format_t *p_fmt_dst,
+                         mtime_t);
+    void (*pf_update)  ( subpicture_t *,
+                         const video_format_t *p_fmt_src,
+                         const video_format_t *p_fmt_dst,
+                         mtime_t );
+    void (*pf_destroy) ( subpicture_t * );
+    subpicture_updater_sys_t *p_sys;
+} subpicture_updater_t;
+
+typedef struct subpicture_private_t subpicture_private_t;
+
 /**
  * Video subtitle
  *
@@ -147,25 +167,17 @@ struct subpicture_t
     int          i_alpha;                                  /**< transparency */
      /**@}*/
 
-    /** Pointer to function that cleans up the private data of this subtitle */
-    void ( *pf_destroy ) ( subpicture_t * );
-
-    /** Pointer to function that update the regions before rendering (optionnal) */
-    void (*pf_update_regions)( spu_t *,
-                               subpicture_t *, const video_format_t *, mtime_t );
+    subpicture_updater_t updater;
 
-    /** Private data - the subtitle plugin might want to put stuff here to
-     * keep track of the subpicture */
-    subpicture_sys_t *p_sys;                              /* subpicture data */
+    subpicture_private_t *p_private;    /* Reserved to the core */
 };
 
-
 /**
  * This function create a new empty subpicture.
  *
  * You must use subpicture_Delete to destroy it.
  */
-VLC_EXPORT( subpicture_t *, subpicture_New, ( void ) );
+VLC_EXPORT( subpicture_t *, subpicture_New, ( const subpicture_updater_t * ) );
 
 /**
  * This function delete a subpicture created by subpicture_New.

modules/codec/avcodec/subtitle.c

@@ -239,7 +239,7 @@ static subpicture_region_t *ConvertRegionRGBA(AVSubtitleRect *ffregion)
  */
 static subpicture_t *ConvertSubtitle(decoder_t *dec, AVSubtitle *ffsub, mtime_t pts)
 {
-    subpicture_t *spu = decoder_NewSubpicture(dec);
+    subpicture_t *spu = decoder_NewSubpicture(dec, NULL);
     if (!spu)
         return NULL;
 

modules/codec/cc.c

@@ -327,7 +327,7 @@ static subpicture_t *Subtitle( decoder_t *p_dec, char *psz_subtitle, char *psz_h
         EnsureUTF8( psz_html );
 
     /* Create the subpicture unit */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu )
     {
         msg_Warn( p_dec, "can't get spu buffer" );

modules/codec/cvdsub.c

@@ -500,7 +500,7 @@ static subpicture_t *DecodePacket( decoder_t *p_dec, block_t *p_data )
     int i;
 
     /* Allocate the subpicture internal data. */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu ) return NULL;
 
     p_spu->i_start = p_data->i_pts;

modules/codec/dvbsub.c

@@ -1477,7 +1477,7 @@ static subpicture_t *render( decoder_t *p_dec )
     int i_base_y;
 
     /* Allocate the subpicture internal data. */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu )
         return NULL;
 

modules/codec/kate.c

@@ -116,7 +116,7 @@ struct decoder_sys_t
     bool   b_use_tiger;
 };
 
-struct subpicture_sys_t
+struct subpicture_updater_sys_t
 {
     decoder_sys_t *p_dec_sys;
     mtime_t        i_start;
@@ -764,18 +764,9 @@ static void SetupText( decoder_t *p_dec, subpicture_t *p_spu, const kate_event *
 
 static void TigerDestroySubpicture( subpicture_t *p_subpic )
 {
-    DecSysRelease( p_subpic->p_sys->p_dec_sys );
+    DecSysRelease( p_subpic->updater.p_sys->p_dec_sys );
+    free( p_subpic->updater.p_sys );
 }
-
-static void SubpictureReleaseRegions( subpicture_t *p_subpic )
-{
-    if( p_subpic->p_region)
-    {
-        subpicture_region_ChainDelete( p_subpic->p_region );
-        p_subpic->p_region = NULL;
-    }
-}
-
 /*
  * We get premultiplied alpha, but VLC doesn't expect this, so we demultiply
  * alpha to avoid double multiply (and thus thinner text than we should)).
@@ -827,66 +818,76 @@ static void PostprocessTigerImage( plane_t *p_plane, unsigned int i_width )
     PROFILE_STOP( tiger_renderer_postprocess );
 }
 
-/* Tiger renders can end up looking a bit crap since they get overlaid on top of
-   a subsampled YUV image, so there can be a fair amount of chroma bleeding.
-   Looks good with white though since it's all luma. Hopefully that will be the
-   common case. */
-static void TigerUpdateRegions( spu_t *p_spu, subpicture_t *p_subpic, const video_format_t *p_fmt, mtime_t ts )
+static int TigerValidateSubpicture( subpicture_t *p_subpic,
+                                    bool b_fmt_src, const video_format_t *p_fmt_src,
+                                    bool b_fmt_dst, const video_format_t *p_fmt_dst,
+                                    mtime_t ts )
 {
-    decoder_sys_t *p_sys = p_subpic->p_sys->p_dec_sys;
-    subpicture_region_t *p_r;
-    video_format_t fmt;
-    plane_t *p_plane;
-    kate_float t;
-    int i_ret;
+    decoder_sys_t *p_sys = p_subpic->updater.p_sys->p_dec_sys;
 
-    VLC_UNUSED( p_spu );
+    if( b_fmt_src || b_fmt_dst )
+        return VLC_EGENERIC;
 
-    PROFILE_START( TigerUpdateRegions );
+    PROFILE_START( TigerValidateSubpicture );
 
     /* time in seconds from the start of the stream */
-    t = (p_subpic->p_sys->i_start + ts - p_subpic->i_start ) / 1000000.0f;
+    kate_float t = (p_subpic->updater.p_sys->i_start + ts - p_subpic->i_start ) / 1000000.0f;
 
     /* it is likely that the current region (if any) can be kept as is; test for this */
     vlc_mutex_lock( &p_sys->lock );
-    if( p_subpic->p_region && !p_sys->b_dirty && !tiger_renderer_is_dirty( p_sys->p_tr ))
-    {
-        PROFILE_START( tiger_renderer_update1 );
-        i_ret = tiger_renderer_update( p_sys->p_tr, t, 1 );
-        PROFILE_STOP( tiger_renderer_update1 );
-        if( i_ret < 0 )
+    int i_ret;
+    if( p_sys->b_dirty || tiger_renderer_is_dirty( p_sys->p_tr ) )
     {
-            SubpictureReleaseRegions( p_subpic );
-            vlc_mutex_unlock( &p_sys->lock );
-            return;
+        i_ret = VLC_EGENERIC;
+        goto exit;
     }
-
-        if( !tiger_renderer_is_dirty( p_sys->p_tr ) )
+    if( tiger_renderer_update( p_sys->p_tr, t, 1 ) >= 0 &&
+        tiger_renderer_is_dirty( p_sys->p_tr ) )
     {
-            /* we can keep the current region list */
-            PROFILE_STOP( TigerUpdateRegions );
-            vlc_mutex_unlock( &p_sys->lock );
-            return;
-        }
+        i_ret = VLC_EGENERIC;
+        goto exit;
     }
+
+    i_ret = VLC_SUCCESS;
+exit:
     vlc_mutex_unlock( &p_sys->lock );
+    PROFILE_STOP( TigerValidateSubpicture );
+    return i_ret;
+}
+
+/* Tiger renders can end up looking a bit crap since they get overlaid on top of
+   a subsampled YUV image, so there can be a fair amount of chroma bleeding.
+   Looks good with white though since it's all luma. Hopefully that will be the
+   common case. */
+static void TigerUpdateSubpicture( subpicture_t *p_subpic,
+                                   const video_format_t *p_fmt_src,
+                                   const video_format_t *p_fmt_dst,
+                                   mtime_t ts )
+{
+    decoder_sys_t *p_sys = p_subpic->updater.p_sys->p_dec_sys;
+    plane_t *p_plane;
+    kate_float t;
+    int i_ret;
+
 
-    /* we have to render again, reset current region list */
-    SubpictureReleaseRegions( p_subpic );
+    /* time in seconds from the start of the stream */
+    t = (p_subpic->updater.p_sys->i_start + ts - p_subpic->i_start ) / 1000000.0f;
+
+    PROFILE_START( TigerUpdateSubpicture );
 
     /* create a full frame region - this will also tell Tiger the size of the frame */
-    fmt = *p_fmt;
+    video_format_t fmt = *p_fmt_dst;
     fmt.i_chroma         = VLC_CODEC_RGBA;
-    fmt.i_width = fmt.i_visible_width;
-    fmt.i_height = fmt.i_visible_height;
     fmt.i_bits_per_pixel = 0;
+    fmt.i_width          =
+    fmt.i_visible_width  = p_fmt_src->i_width;
+    fmt.i_height         =
+    fmt.i_visible_height = p_fmt_src->i_height;
     fmt.i_x_offset       = fmt.i_y_offset = 0;
 
-    p_r = subpicture_region_New( &fmt );
+    subpicture_region_t *p_r = subpicture_region_New( &fmt );
     if( !p_r )
-    {
         return;
-    }
 
     p_r->i_x = 0;
     p_r->i_y = 0;
@@ -921,7 +922,7 @@ static void TigerUpdateRegions( spu_t *p_spu, subpicture_t *p_subpic, const vide
     p_subpic->p_region = p_r;
     p_sys->b_dirty = false;
 
-    PROFILE_STOP( TigerUpdateRegions );
+    PROFILE_STOP( TigerUpdateSubpicture );
 
     vlc_mutex_unlock( &p_sys->lock );
 
@@ -1174,9 +1175,23 @@ static subpicture_t *DecodePacket( decoder_t *p_dec, kate_packet *p_kp, block_t
     /* we have an event */
 
     /* Get a new spu */
-    p_spu = decoder_NewSubpicture( p_dec );
+    subpicture_updater_sys_t *p_spu_sys = NULL;
+    if( p_sys->b_use_tiger)
+    {
+        p_spu_sys = malloc( sizeof(*p_spu_sys) );
+        if( !p_spu_sys )
+            return NULL;
+    }
+    subpicture_updater_t updater = {
+        .pf_validate = TigerValidateSubpicture,
+        .pf_update   = TigerUpdateSubpicture,
+        .pf_destroy  = TigerDestroySubpicture,
+        .p_sys       = p_spu_sys,
+    };
+    p_spu = decoder_NewSubpicture( p_dec, p_sys->b_use_tiger ? &updater : NULL );
     if( !p_spu )
     {
+        free( p_spu_sys );
         /* this will happen for lyrics as there is no vout - so no error */
         /* msg_Err( p_dec, "Failed to allocate spu buffer" ); */
         return NULL;
@@ -1190,15 +1205,8 @@ static subpicture_t *DecodePacket( decoder_t *p_dec, kate_packet *p_kp, block_t
 #ifdef HAVE_TIGER
     if( p_sys->b_use_tiger)
     {
-        /* setup the structure to get our decoder struct back */
-        p_spu->p_sys = malloc( sizeof( subpicture_sys_t ));
-        if( !p_spu->p_sys )
-        {
-            decoder_DeleteSubpicture( p_dec, p_spu );
-            return NULL;
-        }
-        p_spu->p_sys->p_dec_sys = p_sys;
-        p_spu->p_sys->i_start = p_block->i_pts;
+        p_spu_sys->p_dec_sys = p_sys;
+        p_spu_sys->i_start   = p_block->i_pts;
         DecSysHold( p_sys );
 
         p_spu->i_stop = __MAX( p_sys->i_max_stop, p_spu->i_stop );
@@ -1209,10 +1217,6 @@ static subpicture_t *DecodePacket( decoder_t *p_dec, kate_packet *p_kp, block_t
         vlc_mutex_lock( &p_sys->lock );
         CHECK_TIGER_RET( tiger_renderer_add_event( p_sys->p_tr, ev->ki, ev ) );
         vlc_mutex_unlock( &p_sys->lock );
-
-        /* hookup render/update routines */
-        p_spu->pf_update_regions = TigerUpdateRegions;
-        p_spu->pf_destroy = TigerDestroySubpicture;
     }
     else
 #endif

modules/codec/libass.c

@@ -74,9 +74,6 @@ vlc_module_end ()
  * Local prototypes
  *****************************************************************************/
 static subpicture_t *DecodeBlock( decoder_t *, block_t ** );
-static void DestroySubpicture( subpicture_t * );
-static void UpdateRegions( spu_t *,
-                           subpicture_t *, const video_format_t *, mtime_t );
 
 /* Yes libass sux with threads */
 typedef struct
@@ -109,12 +106,25 @@ struct decoder_sys_t
 static void DecSysRelease( decoder_sys_t *p_sys );
 static void DecSysHold( decoder_sys_t *p_sys );
 
-struct subpicture_sys_t
+/* */
+static int SubpictureValidate( subpicture_t *,
+                               bool, const video_format_t *,
+                               bool, const video_format_t *,
+                               mtime_t );
+static void SubpictureUpdate( subpicture_t *,
+                              const video_format_t *,
+                              const video_format_t *,
+                              mtime_t );
+static void SubpictureDestroy( subpicture_t * );
+
+struct subpicture_updater_sys_t
 {
     decoder_sys_t *p_dec_sys;
     void          *p_subs_data;
     int           i_subs_len;
     mtime_t       i_pts;
+
+    ASS_Image     *p_img;
 };
 
 typedef struct
@@ -125,8 +135,7 @@ typedef struct
     int y1;
 } rectangle_t;
 
-static int BuildRegions( spu_t *p_spu, rectangle_t *p_region, int i_max_region, ASS_Image *p_img_list, int i_width, int i_height );
-static void SubpictureReleaseRegions( spu_t *p_spu, subpicture_t *p_subpic );
+static int BuildRegions( rectangle_t *p_region, int i_max_region, ASS_Image *p_img_list, int i_width, int i_height );
 static void RegionDraw( subpicture_region_t *p_region, ASS_Image *p_img );
 
 static vlc_mutex_t libass_lock = VLC_STATIC_MUTEX;
@@ -246,34 +255,41 @@ static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
         return NULL;
     }
 
-    p_spu = decoder_NewSubpicture( p_dec );
-    if( !p_spu )
+    subpicture_updater_sys_t *p_spu_sys = malloc( sizeof(*p_spu_sys) );
+    if( !p_spu_sys )
     {
-        msg_Warn( p_dec, "can't get spu buffer" );
         block_Release( p_block );
         return NULL;
     }
 
-    p_spu->p_sys = malloc( sizeof( subpicture_sys_t ));
-    if( !p_spu->p_sys )
+    subpicture_updater_t updater = {
+        .pf_validate = SubpictureValidate,
+        .pf_update   = SubpictureUpdate,
+        .pf_destroy  = SubpictureDestroy,
+        .p_sys       = p_spu_sys,
+    };
+    p_spu = decoder_NewSubpicture( p_dec, &updater );
+    if( !p_spu )
     {
-        decoder_DeleteSubpicture( p_dec, p_spu );
+        msg_Warn( p_dec, "can't get spu buffer" );
+        free( p_spu_sys );
         block_Release( p_block );
         return NULL;
     }
 
-    p_spu->p_sys->i_subs_len = p_block->i_buffer;
-    p_spu->p_sys->p_subs_data = malloc( p_block->i_buffer );
-    if( !p_spu->p_sys->p_subs_data )
+    p_spu_sys->p_img = NULL;
+    p_spu_sys->p_dec_sys = p_sys;
+    p_spu_sys->i_subs_len = p_block->i_buffer;
+    p_spu_sys->p_subs_data = malloc( p_block->i_buffer );
+    p_spu_sys->i_pts = p_block->i_pts;
+    if( !p_spu_sys->p_subs_data )
     {
-        free( p_spu->p_sys );
         decoder_DeleteSubpicture( p_dec, p_spu );
         block_Release( p_block );
         return NULL;
     }
-    memcpy( p_spu->p_sys->p_subs_data, p_block->p_buffer,
+    memcpy( p_spu_sys->p_subs_data, p_block->p_buffer,
             p_block->i_buffer );
-    p_spu->p_sys->i_pts = p_block->i_pts;
 
     p_spu->i_start = p_block->i_pts;
     p_spu->i_stop = __MAX( p_sys->i_max_stop, p_block->i_pts + p_block->i_length );
@@ -285,16 +301,12 @@ static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
     vlc_mutex_lock( &libass_lock );
     if( p_sys->p_track )
     {
-        ass_process_chunk( p_sys->p_track, p_spu->p_sys->p_subs_data, p_spu->p_sys->i_subs_len,
+        ass_process_chunk( p_sys->p_track, p_spu_sys->p_subs_data, p_spu_sys->i_subs_len,
                            p_block->i_pts / 1000, p_block->i_length / 1000 );
     }
     vlc_mutex_unlock( &libass_lock );
 
-    p_spu->pf_update_regions = UpdateRegions;
-    p_spu->pf_destroy = DestroySubpicture;
-    p_spu->p_sys->p_dec_sys = p_sys;
-
-    DecSysHold( p_sys );
+    DecSysHold( p_sys ); /* Keep a reference for the returned subpicture */
 
     block_Release( p_block );
 
@@ -304,35 +316,28 @@ static subpicture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 /****************************************************************************
  *
  ****************************************************************************/
-static void DestroySubpicture( subpicture_t *p_subpic )
-{
-    DecSysRelease( p_subpic->p_sys->p_dec_sys );
-
-    free( p_subpic->p_sys->p_subs_data );
-    free( p_subpic->p_sys );
-}
-
-static void UpdateRegions( spu_t *p_spu, subpicture_t *p_subpic,
-                           const video_format_t *p_fmt, mtime_t i_ts )
+static int SubpictureValidate( subpicture_t *p_subpic,
+                               bool b_fmt_src, const video_format_t *p_fmt_src,
+                               bool b_fmt_dst, const video_format_t *p_fmt_dst,
+                               mtime_t i_ts )
 {
-    decoder_sys_t *p_sys = p_subpic->p_sys->p_dec_sys;
+    decoder_sys_t *p_sys = p_subpic->updater.p_sys->p_dec_sys;
     ass_handle_t *p_ass = p_sys->p_ass;
 
-    video_format_t fmt;
-    bool b_fmt_changed;
-
     vlc_mutex_lock( &libass_lock );
 
-    /* */
-    fmt = *p_fmt;
+    /* FIXME why this mix of src/dst */
+    video_format_t fmt = *p_fmt_dst;
     fmt.i_chroma         = VLC_CODEC_RGBA;
-    fmt.i_width = fmt.i_visible_width;
-    fmt.i_height = fmt.i_visible_height;
     fmt.i_bits_per_pixel = 0;
-    fmt.i_x_offset = fmt.i_y_offset = 0;
+    fmt.i_width          =
+    fmt.i_visible_width  = p_fmt_src->i_width;
+    fmt.i_height         =
+    fmt.i_visible_height = p_fmt_src->i_height;
+    fmt.i_x_offset       =
+    fmt.i_y_offset       = 0;
 
-    b_fmt_changed = memcmp( &fmt, &p_ass->fmt, sizeof(fmt) ) != 0;
-    if( b_fmt_changed )
+    if( b_fmt_src || b_fmt_dst )
     {
         ass_set_frame_size( p_ass->p_renderer, fmt.i_width, fmt.i_height );
 #if defined( LIBASS_VERSION ) && LIBASS_VERSION >= 0x00907000
@@ -340,27 +345,42 @@ static void UpdateRegions( spu_t *p_spu, subpicture_t *p_subpic,
 #else
         ass_set_aspect_ratio( p_ass->p_renderer, 1.0 ); // TODO ?
 #endif
-
         p_ass->fmt = fmt;
     }
 
     /* */
-    const mtime_t i_stream_date = p_subpic->p_sys->i_pts + (i_ts - p_subpic->i_start);
+    const mtime_t i_stream_date = p_subpic->updater.p_sys->i_pts + (i_ts - p_subpic->i_start);
     int i_changed;
     ASS_Image *p_img = ass_render_frame( p_ass->p_renderer, p_sys->p_track,
                                          i_stream_date/1000, &i_changed );
 
-    if( !i_changed && !b_fmt_changed &&
+    if( !i_changed && !b_fmt_src && !b_fmt_dst &&
         (p_img != NULL) == (p_subpic->p_region != NULL) )
     {
         vlc_mutex_unlock( &libass_lock );
-        return;
+        return VLC_SUCCESS;
     }
+    p_subpic->updater.p_sys->p_img = p_img;
+
+    /* The lock is released by SubpictureUpdate */
+    return VLC_EGENERIC;
+}
+
+static void SubpictureUpdate( subpicture_t *p_subpic,
+                              const video_format_t *p_fmt_src,
+                              const video_format_t *p_fmt_dst,
+                              mtime_t i_ts )
+{
+    decoder_sys_t *p_sys = p_subpic->updater.p_sys->p_dec_sys;
+    ass_handle_t *p_ass = p_sys->p_ass;
+
+    video_format_t fmt = p_ass->fmt;
+    ASS_Image *p_img = p_subpic->updater.p_sys->p_img;
+    //vlc_assert_locked( &libass_lock );
 
     /* */
     p_subpic->i_original_picture_height = fmt.i_height;
     p_subpic->i_original_picture_width = fmt.i_width;
-    SubpictureReleaseRegions( p_spu, p_subpic );
 
     /* XXX to improve efficiency we merge regions that are close minimizing
      * the lost surface.
@@ -370,7 +390,7 @@ static void UpdateRegions( spu_t *p_spu, subpicture_t *p_subpic,
      */
     const int i_max_region = 4;
     rectangle_t region[i_max_region];
-    const int i_region = BuildRegions( p_spu, region, i_max_region, p_img, fmt.i_width, fmt.i_height );
+    const int i_region = BuildRegions( region, i_max_region, p_img, fmt.i_width, fmt.i_height );
 
     if( i_region <= 0 )
     {
@@ -409,6 +429,15 @@ static void UpdateRegions( spu_t *p_spu, subpicture_t *p_subpic,
         pp_region_last = &r->p_next;
     }
     vlc_mutex_unlock( &libass_lock );
+
+}
+static void SubpictureDestroy( subpicture_t *p_subpic )
+{
+    subpicture_updater_sys_t *p_sys = p_subpic->updater.p_sys;
+
+    DecSysRelease( p_sys->p_dec_sys );
+    free( p_sys->p_subs_data );
+    free( p_sys );
 }
 
 static rectangle_t r_create( int x0, int y0, int x1, int y1 )
@@ -437,13 +466,11 @@ static bool r_overlap( const rectangle_t *a, const rectangle_t *b, int i_dx, int
             __MAX(a->y0-i_dy, b->y0) < __MIN( a->y1+i_dy, b->y1 );
 }
 
-static int BuildRegions( spu_t *p_spu, rectangle_t *p_region, int i_max_region, ASS_Image *p_img_list, int i_width, int i_height )
+static int BuildRegions( rectangle_t *p_region, int i_max_region, ASS_Image *p_img_list, int i_width, int i_height )
 {
     ASS_Image *p_tmp;
     int i_count;
 
-    VLC_UNUSED(p_spu);
-
 #ifdef DEBUG_REGION
     int64_t i_ck_start = mdate();
 #endif
@@ -629,14 +656,6 @@ static void RegionDraw( subpicture_region_t *p_region, ASS_Image *p_img )
 #endif
 }
 
-
-static void SubpictureReleaseRegions( spu_t *p_spu, subpicture_t *p_subpic )
-{
-    VLC_UNUSED( p_spu );
-    subpicture_region_ChainDelete( p_subpic->p_region );
-    p_subpic->p_region = NULL;
-}
-
 /* */
 static ass_handle_t *AssHandleHold( decoder_t *p_dec )
 {

modules/codec/spudec/parse.c

@@ -101,7 +101,7 @@ subpicture_t * ParsePacket( decoder_t *p_dec )
     spu_properties_t spu_properties;
 
     /* Allocate the subpicture internal data. */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu ) return NULL;
 
     p_spu->i_original_picture_width =

modules/codec/subtitles/subsdec.c

@@ -495,7 +495,7 @@ static subpicture_t *ParseText( decoder_t *p_dec, block_t *p_block )
     }
 
     /* Create the subpicture unit */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu )
     {
         msg_Warn( p_dec, "can't get spu buffer" );

modules/codec/subtitles/subsusf.c

@@ -211,7 +211,7 @@ static subpicture_t *ParseText( decoder_t *p_dec, block_t *p_block )
     }
 
     /* Create the subpicture unit */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu )
     {
         msg_Warn( p_dec, "can't get spu buffer" );

modules/codec/svcdsub.c

@@ -469,7 +469,7 @@ static subpicture_t *DecodePacket( decoder_t *p_dec, block_t *p_data )
     int i;
 
     /* Allocate the subpicture internal data. */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu ) return NULL;
 
     p_spu->i_start = p_data->i_pts;

modules/codec/telx.c

@@ -685,7 +685,7 @@ static subpicture_t *Decode( decoder_t *p_dec, block_t **pp_block )
     strcpy( p_sys->psz_prev_text, psz_text );
 
     /* Create the subpicture unit */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu )
     {
         msg_Warn( p_dec, "can't get spu buffer" );

modules/codec/zvbi.c

@@ -455,7 +455,7 @@ static subpicture_t *Subpicture( decoder_t *p_dec, video_format_t *p_fmt,
 
     /* If there is a page or sub to render, then we do that here */
     /* Create the subpicture unit */
-    p_spu = decoder_NewSubpicture( p_dec );
+    p_spu = decoder_NewSubpicture( p_dec, NULL );
     if( !p_spu )
     {
         msg_Warn( p_dec, "can't get spu buffer" );

modules/stream_out/transcode/spu.c

@@ -34,10 +34,11 @@
 #include <vlc_osd.h>
 #include <assert.h>
 
-static subpicture_t *spu_new_buffer( decoder_t *p_dec )
+static subpicture_t *spu_new_buffer( decoder_t *p_dec,
+                                     const subpicture_updater_t *p_upd )
 {
     VLC_UNUSED( p_dec );
-    return subpicture_New();
+    return subpicture_New( p_upd );
 }
 
 static void spu_del_buffer( decoder_t *p_dec, subpicture_t *p_subpic )

src/input/decoder.c

@@ -75,7 +75,7 @@ static void vout_del_buffer( decoder_t *, picture_t * );
 static void vout_link_picture( decoder_t *, picture_t * );
 static void vout_unlink_picture( decoder_t *, picture_t * );
 
-static subpicture_t *spu_new_buffer( decoder_t * );
+static subpicture_t *spu_new_buffer( decoder_t *, const subpicture_updater_t * );
 static void spu_del_buffer( decoder_t *, subpicture_t * );
 
 struct decoder_owner_sys_t
@@ -213,13 +213,15 @@ void decoder_DeleteAudioBuffer( decoder_t *p_decoder, aout_buffer_t *p_buffer )
     p_decoder->pf_aout_buffer_del( p_decoder, p_buffer );
 }
 
-subpicture_t *decoder_NewSubpicture( decoder_t *p_decoder )
+subpicture_t *decoder_NewSubpicture( decoder_t *p_decoder,
+                                     const subpicture_updater_t *p_dyn )
 {
-    subpicture_t *p_subpicture = p_decoder->pf_spu_buffer_new( p_decoder );
+    subpicture_t *p_subpicture = p_decoder->pf_spu_buffer_new( p_decoder, p_dyn );
     if( !p_subpicture )
         msg_Warn( p_decoder, "can't get output subpicture" );
     return p_subpicture;
 }
+
 void decoder_DeleteSubpicture( decoder_t *p_decoder, subpicture_t *p_subpicture )
 {
     p_decoder->pf_spu_buffer_del( p_decoder, p_subpicture );
@@ -2382,7 +2384,8 @@ static void vout_unlink_picture( decoder_t *p_dec, picture_t *p_pic )
     vout_ReleasePicture( p_dec->p_owner->p_vout, p_pic );
 }
 
-static subpicture_t *spu_new_buffer( decoder_t *p_dec )
+static subpicture_t *spu_new_buffer( decoder_t *p_dec,
+                                     const subpicture_updater_t *p_updater )
 {
     decoder_owner_sys_t *p_owner = p_dec->p_owner;
     vout_thread_t *p_vout = NULL;
@@ -2421,7 +2424,7 @@ static subpicture_t *spu_new_buffer( decoder_t *p_dec )
         p_owner->p_spu_vout = p_vout;
     }
 
-    p_subpic = subpicture_New();
+    p_subpic = subpicture_New( p_updater );
     if( p_subpic )
     {
         p_subpic->i_channel = p_owner->i_spu_channel;

src/osd/osd_text.c

@@ -78,7 +78,7 @@ int osd_ShowTextAbsolute( spu_t *p_spu_channel, int i_channel,
 
     if( !psz_string ) return VLC_EGENERIC;
 
-    p_spu = subpicture_New();
+    p_spu = subpicture_New( NULL );
     if( !p_spu )
         return VLC_EGENERIC;
 

src/osd/osd_widgets.c

@@ -198,7 +198,7 @@ subpicture_t *osd_CreateWidget( spu_t *p_spu, int i_channel )
     VLC_UNUSED(p_spu);
 
     /* Create and initialize a subpicture */
-    p_subpic = subpicture_New();
+    p_subpic = subpicture_New( NULL );
     if( p_subpic == NULL ) return NULL;
 
     p_subpic->i_channel = i_channel;

src/video_output/video_epg.c

@@ -259,7 +259,7 @@ int vout_OSDEpg( vout_thread_t *p_vout, input_item_t *p_input )
     if( p_epg == NULL )
         return VLC_EGENERIC;
 
-    p_spu = subpicture_New();
+    p_spu = subpicture_New( NULL );
     if( !p_spu )
     {
         vlc_epg_Delete( p_epg );

src/video_output/video_text.c

@@ -78,7 +78,7 @@ int vout_ShowTextAbsolute( vout_thread_t *p_vout, int i_channel,
 
     if( !psz_string ) return VLC_EGENERIC;
 
-    p_spu = subpicture_New();
+    p_spu = subpicture_New( NULL );
     if( !p_spu )
         return VLC_EGENERIC;
 

src/video_output/vout_subpictures.c

@@ -142,6 +142,10 @@ static bool spu_area_overlap( spu_area_t, spu_area_t );
 
 #define SCALE_UNIT (1000)
 
+static void SubpictureUpdate( subpicture_t *,
+                              const video_format_t *p_fmt_src,
+                              const video_format_t *p_fmt_dst,
+                              mtime_t i_ts );
 static void SubpictureChain( subpicture_t **pp_head, subpicture_t *p_subpic );
 static int SubpictureCmp( const void *s0, const void *s1 );
 
@@ -387,17 +391,9 @@ void spu_RenderSubpictures( spu_t *p_spu,
             p_subpic != NULL;
                 p_subpic = p_subpic->p_next )
     {
-        if( p_subpic->pf_update_regions )
-        {
-            video_format_t fmt_org = *p_fmt_dst;
-            fmt_org.i_width =
-            fmt_org.i_visible_width = i_source_video_width;
-            fmt_org.i_height =
-            fmt_org.i_visible_height = i_source_video_height;
-
-            p_subpic->pf_update_regions( p_spu, p_subpic, &fmt_org,
+        SubpictureUpdate( p_subpic,
+                          p_fmt_src, p_fmt_dst,
                           p_subpic->b_subtitle ? render_subtitle_date : render_osd_date );
-        }
 
         /* */
         if( p_subpic->b_subtitle )
@@ -702,7 +698,13 @@ void spu_OffsetSubtitleDate( spu_t *p_spu, mtime_t i_duration )
 /*****************************************************************************
  * subpicture_t allocation
  *****************************************************************************/
-subpicture_t *subpicture_New( void )
+struct subpicture_private_t
+{
+    video_format_t src;
+    video_format_t dst;
+};
+
+subpicture_t *subpicture_New( const subpicture_updater_t *p_upd )
 {
     subpicture_t *p_subpic = calloc( 1, sizeof(*p_subpic) );
     if( !p_subpic )
@@ -714,9 +716,30 @@ subpicture_t *subpicture_New( void )
     p_subpic->b_subtitle = false;
     p_subpic->i_alpha    = 0xFF;
     p_subpic->p_region   = NULL;
-    p_subpic->pf_destroy = NULL;
-    p_subpic->p_sys      = NULL;
 
+    if( p_upd )
+    {
+        subpicture_private_t *p_private = malloc( sizeof(*p_private) );
+        if( !p_private )
+        {
+            free( p_subpic );
+            return NULL;
+        }
+        video_format_Init( &p_private->src, 0 );
+        video_format_Init( &p_private->dst, 0 );
+
+        p_subpic->updater   = *p_upd;
+        p_subpic->p_private = p_private;
+    }
+    else
+    {
+        p_subpic->p_private = NULL;
+
+        p_subpic->updater.pf_validate = NULL;
+        p_subpic->updater.pf_update   = NULL;
+        p_subpic->updater.pf_destroy  = NULL;
+        p_subpic->updater.p_sys       = NULL;
+    }
     return p_subpic;
 }
 
@@ -725,10 +748,10 @@ void subpicture_Delete( subpicture_t *p_subpic )
     subpicture_region_ChainDelete( p_subpic->p_region );
     p_subpic->p_region = NULL;
 
-    if( p_subpic->pf_destroy )
-    {
-        p_subpic->pf_destroy( p_subpic );
-    }
+    if( p_subpic->updater.pf_destroy )
+        p_subpic->updater.pf_destroy( p_subpic );
+
+    free( p_subpic->p_private );
     free( p_subpic );
 }
 
@@ -762,7 +785,7 @@ subpicture_t *subpicture_NewFromPicture( vlc_object_t *p_obj,
     if( !p_pip )
         return NULL;
 
-    subpicture_t *p_subpic = subpicture_New();
+    subpicture_t *p_subpic = subpicture_New( NULL );
     if( !p_subpic )
     {
          picture_Release( p_pip );
@@ -788,6 +811,36 @@ subpicture_t *subpicture_NewFromPicture( vlc_object_t *p_obj,
     return p_subpic;
 }
 
+static void SubpictureUpdate( subpicture_t *p_subpicture,
+                              const video_format_t *p_fmt_src,
+                              const video_format_t *p_fmt_dst,
+                              mtime_t i_ts )
+{
+    subpicture_updater_t *p_upd = &p_subpicture->updater;
+    subpicture_private_t *p_private = p_subpicture->p_private;
+
+    if( !p_upd->pf_validate )
+        return;
+    if( !p_upd->pf_validate( p_subpicture,
+                          !video_format_IsSimilar( p_fmt_src,
+                                                   &p_private->src ), p_fmt_src,
+                          !video_format_IsSimilar( p_fmt_dst,
+                                                   &p_private->dst ), p_fmt_dst,
+                          i_ts ) )
+        return;
+
+    subpicture_region_ChainDelete( p_subpicture->p_region );
+    p_subpicture->p_region = NULL;
+
+    p_upd->pf_update( p_subpicture, p_fmt_src, p_fmt_dst, i_ts );
+
+    video_format_Clean( &p_private->src );
+    video_format_Clean( &p_private->dst );
+
+    video_format_Copy( &p_private->src, p_fmt_src );
+    video_format_Copy( &p_private->dst, p_fmt_dst );
+}
+
 /*****************************************************************************
  * subpicture_region_t allocation
  *****************************************************************************/
@@ -1835,7 +1888,7 @@ static subpicture_t *sub_new_buffer( filter_t *p_filter )
 {
     filter_owner_sys_t *p_sys = p_filter->p_owner;
 
-    subpicture_t *p_subpicture = subpicture_New();
+    subpicture_t *p_subpicture = subpicture_New( NULL );
     if( p_subpicture )
         p_subpicture->i_channel = p_sys->i_channel;
     return p_subpicture;
@@ -1849,7 +1902,7 @@ static void sub_del_buffer( filter_t *p_filter, subpicture_t *p_subpic )
 static subpicture_t *spu_new_buffer( filter_t *p_filter )
 {
     VLC_UNUSED(p_filter);
-    return subpicture_New();
+    return subpicture_New( NULL );
 }
 static void spu_del_buffer( filter_t *p_filter, subpicture_t *p_subpic )
 {