Work on video devices

[bennylp]

This is placeholder ticket for all works related to video devices.

[bennylp]

(In [3459]) Re #1213 (video devices):

• fixed devices to correctly increment the frame timestamp
• minor fix in video port to set default "active" value to 1 in the param

[ming]

(In [3467]) Re #1213 (video devices):
Modified ios_dev and qt_dev to use pjmedia_vid_dev_stream

[nanang]

(In [3470]) Re #1213:

• Added encoding format conversion (only format ID) in video port.
• Fixed few bugs in direct show capture device:
  • VIDEOINFOHEADER.AvgTimePerFrame? calculation overflow which caused failure in opening capture device.
  • AM_MEDIA_TYPE.formattype validation to avoid bad type casting (of VIDEOINFOHEADER).

[ming]

(In [3484]) Re #1213:

• Move Mac OS' CFRunLoop object from vid_dev_test inside qt
• Remove NSApplication object management and auto release pool from vid_dev_test. Temporarily depend on SDLmain library for these.

[bennylp]

(In [3489]) Re #1213 (Video devices):

• Video device now opens in "best effort" mode, i.e. it may open with different size and fps than requested. The actual size and fps will be reflected in the "param" upon return. The vidport must check this against any differences, and create converter accordingly.
• Removed const for param argument in vid_create_stream() API
• Currently converter in vidport will not work if vidport is opened in bidir. Converter for renderer is untested

[ming]

(In [3499]) Re #1213:
Add OpenGL support for SDL renderer

[bennylp]

(In [3505]) Re #1213: added printing error message when fails to open DirectShow? device

[ming]

(In [3507]) Re #1213: In case of failure, Dshow capture dev now tries re-opening the device with default setting (size and/or fps).

[ming]

(In [3509]) Re #1213:

• Add pjmedia_frame_copy()
• Add converter for renderer videoport
• Add checking in SDL device since it may receive a frame size bigger than expected

[ming]

(In [3511]) Re #1213:
(Minor): Add check to dshow so that it doesn't need to change the output param when not trying to use default size and/or fps.

[ming]

(In [3516]) Re #1213: Fixed error space number allocation for video devices.

[ming]

(In [3525]) Re #1213: Fixed SDL OpenGL to run on Windows.

[bennylp]

(In [3527]) Re #1213: fixed compilation error in sdl_dev.c if OpenGL is not available

[ming]

(In [3535]) Re #1213: Add on-the-fly format change capability for SDL OpenGL.

[ming]

(In [3537]) Re #1213: Fixed typo and compiler warning for SDL device on Mac

[ming]

(In [3539]) Re #1213: Fixed format change detection when there is a converter in place.