Bug 1494 - GLMediaPlayer/GraphUI: Support Displaying Bitmap'ed Subtitles (PGS ..) via FFMPEGFMediaPlayer/FFmpeg

FFMPEGFMediaPlayer related changes:
- Add libswscale (6th FFmpeg lib used) for sws_getCachedContext(), sws_scale() and sws_freeContext(),
  used natively to convert the palette'ed bitmap into RGBA colorspace -> GL texture

- Handling AVSubtitleRect.type SUBTITLE_BITMAP
-- only handled if libswscale is available
-- config/adjust texture object
-- sws_scale palette'ed bitmap to texture
-- intermediate memory is cached, may be resized and free'ed at destroy
-- texture objects are managed and passed from GLMediaPlayerImpl,
   as they are also forwarded to player client via SubBitmapEvent

- Passing the AVCodecID to GLMediaPlayerImpl, converted to our CodecID enum.

- Unifying creation and opening of AVCodecContext with 'createOpenedAVCodecContext(..)'

+++

SubtitleEvent*
- SubTextEvent now also handles ASS.Dialogue (FFmpeg 4)
  besides ASS.Event (FFmpeg 5, 6, ..).

+++

GLMediaPlayerImpl
- Added ringbuffer subTexFree, managing Texture for bitmap'ed subtitles
-- Uses 1 bitmap-subtitle Texture per used textureCount in cache,
   as one bitmap-subtile can be displayed per frame.
   Could be potentially reduced to just 2 .. but resources used are
   relatively low here.

- Validating subTexFree + videoFramesFree usage,
  use blocking get/put ringbuffer due to utilization from different threads.

- Receives subtitle content from native getNextPacket0() via callback,
  creates SubtitleEvent instance and passes it to a SubtitleEventListener - if exists.
  (See MediaButton example)

-- SubBitmapEvent also gets its special SubBitmapEvent.TextureOwner to handle client releasing
   the event and allowing us to put back the Texture resource to 'subTexFree'.
   This passing through of the Texture object is probably a weakness of this lifecycle
   and requires the client to ensure SubtitleEvent.release() gets called.
   See MediaButton example!

- Exposing CodecID, allowing clients like MediaButton to handle SubtitleEvent content according to codec

0 files changed, 0 insertions, 0 deletions