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  25. 07 Jul, 2007 1 commit
    • Laurent Aimar's avatar
      all: Subtitle improvment patch by Bernie Purcell. · 4d4eb334
      Laurent Aimar authored
      Author comments:
      It makes the following changes:
      * Changes to vout_subpictures.c to create some new variables which
      renderers are free to use to render time-specific subtitling
      information, such as karaoke. One of these variables allows for the text
      region to not be permanently converted to YUVA/YUVP - so that more than
      one pass can be made on the subtitle - so that it will update correctly
      over time. If a rendering module doesn't use or change any of the
      variables it behaves the same as usual, with the text region being
      rendered just the once to a YUVA/YUVP region and then just blended to
      the video on future passes.
      * Changes to alignment implementation: no longer use the i_text_align
      field of font_style_t at all; require the alignment to be correctly
      setup solely in the subpicture_region_t's i_align field (this is so that
      the alignment initially inherited from a style can be overridden). This
      meant minor changes to freetype.c and quartztext.c as well as the
      deletion of the i_text_align field in vlc_osd.h. It also involved some
      changes in subsdec.c, where most of the work in this patch occurs.
      * Minor change to quartztext.c to correct the interpretation of font
      size parameter, making it consistent with a similar change being made in
      subsdec.c, and to strip out multiple whitespace in html subtitles
      (Similar changes to the freetype.c module have already been made as part
      of a separate larger patch submission to fix problems with bidirectional
      styled text in that module)
      * Adds 2 new fields for carrying karaoke specific information to the
      text_style_t struct in vlc_osd.h. Changed the default_text_style's
      definition to agree with the changes made in the fields of text_style_t
      * Support for <image> and <karaoke> subtitles in subsdec.c. (Full
      working karaoke also requires an as-yet unsubmitted patch to the
      renderers to implement)
      * Support for more than one subpicture_region_t per timestamp, with each
      subpicture region being able to have its own alignment and margins and
      type: text or image
      * Better calculation of plain-text versions of html subtitles
      NB: This patch still makes use of a mechanism of explicitly requesting
      the sdl_image module to decode any images it wants. The main reason for
      this is that the bmp decoder in ffmpeg (the image decoder with the
      highest score) presently only handles 16, 24 and 32 bit depths. An
      alternative is for us to switch off the bmp support in ffmpeg for the
      time being and the segment of code in subsdec.c that explicitly requests
      this module (along with one line added to sdl_image.c) can be removed.
      I'm not fussed by either implementation, but this way probably affects
      fewer other modules, so have submitted it this way.
  26. 26 Apr, 2007 1 commit
  27. 24 Apr, 2007 1 commit