GLMediaPlayer: Add multithreaded decoding w/ textureCount > 2 where available EGL/FFMPeg. WIP!

Off-thread decoding:
  If validated (impl) textureCount > 2, decoding happens on extra thread.
  If decoding requires GL context, a shared context is created for decoding thread.

API Changes:
- initGLStream(..): Adds 'textureCount' as argument.
- TextureSequence.TexSeqEventListener.newFrameAvailable(..) exposes the new frame available
- TextureSequence.TextureFrame exposes the PTS (video)

Implementation:

- 'int validateTextureCount(int)': implementation decides whether textureCount can be > 2, i.e. off-thread decoding allowed,
  default is NO w/ textureCount==2!

- 'boolean requiresOffthreadGLCtx()': implementation decides whether shared context is required for off-thread decoding

- 'syncFrame2Audio(TextureFrame frame)': implementation shall handle a/v sync, due to audio stream details (pts, buffered frames)

- FFMPEGMediaPlayer extends GLMediaPlayerImpl, no more EGLMediaPlayerImpl (redundant)

+++

- SyncedRingbuffer: Expose T[] array

+++

TODO:
 - syncAV!
 - test Android

1 files changed, 8 insertions, 0 deletions

diff --git a/src/jogl/native/libav/ffmpeg_tool.h b/src/jogl/native/libav/ffmpeg_tool.h
index 5560b8617..2dff1110c 100644
--- a/src/jogl/native/libav/ffmpeg_tool.h
+++ b/src/jogl/native/libav/ffmpeg_tool.h
@@ -48,6 +48,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <GL/gl.h>
+
+typedef void (APIENTRYP PFNGLTEXSUBIMAGE2DPROC) (GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels);
+typedef GLenum (APIENTRYP PFNGLGETERRORPROC) (void);
+
 /**
  *  AV_TIME_BASE   1000000
  */
@@ -63,6 +68,9 @@ static inline int32_t my_av_q2i32(int32_t snum, AVRational a){
 typedef struct {
     int32_t          verbose;
 
+    PFNGLTEXSUBIMAGE2DPROC procAddrGLTexSubImage2D;
+    PFNGLGETERRORPROC procAddrGLGetError;
+
     AVFormatContext* pFormatCtx;
     int32_t          vid;
     AVStream*        pVStream;