Support building AJA plugins with either the new libajantv2 library, or
the deprecated ntv2 library.
Finder scripts updated to search for libajantv2 and fall back to ntv2 if
not found. This allows this PR to be merged without requiring a
corresponding update to the pre-built obs-deps packages.
The functions `aja::lower` and `aja::replace` overwrite the 1st argument
and just return the reference to the 1st argument. It is not necessary
to use the return value.
Creation of Info.plist files through Xcode is more canonical and
future-proof, as it will automatically pick up changes/updates
introduced by Apple. Non-standard keys can still be added via a
template file, which will then be extended by Xcode with the default
keys.
Effectively reverting parts of d314d47, this commit removes the new
functions that got added to remove the flags parameter. Instead, it just
marks the parameter as unused and documents this. Having what is
effectively an API break just to remove a parameter is a bit overkill.
The other parts of d314d47 which cleaned up the usage of the flags
parameter are untouched here.
This deprecates the following functions, replacing them with new
versions:
- `obs_output_can_begin_data_capture()` - now `*capture2()`
- `obs_output_initialize_encoders()` - now `*encoders2()`
- `obs_output_begin_data_capture()` - now `*capture2()`
The flags parameter was initially designed to support audio-only or
video-only operation of an output which had the `OBS_OUTPUT_AV` flag,
however, full support for that was never implemented, and there are
likely fundamental issues with an implementation, mainly that most
outputs are programmed assuming that there will always be at least one
audio and one video track. This requires new flags specifying support
for optional audio/video, among other things.
An implementation to allow audio/video to be optional is best done
using the flag technique above, with audio/video enablement specified
by whether media (raw, `video_t/audio_t`) or encoder (`obs_encoder_t`)
objects are specified.
Since every implementation I could find always specifies `flags` as 0,
I was able to safely conclude that immediately removing the parameter's
functionality is safe to do.
Add aja-source version 2 to differentiate buffering settings, which is
implemented in a255b0f74.
To register two versions, remove to return obs_source_info and register
the source inside aja-source.cpp.
Also revise aja-output.cpp to register aja-output to keep consistency of
function type.
To improve readability of the capture thread function
`AJASource::CaptureThread`, audio part is split into two functions.
Behavior is not changed.
Also fixed one of warnings.
When too many audio frames are captured and at the same time the ring
buffer on the card is wrapped, memory overrun was not captured before
DMA transfer, which resulted in corruption of memory contents. This
commit moves the overrun check before the DMA transfer.
Buffering inside libobs is enabled by default and it causes latency of
video. This commit provides a property to switch the buffering.
Since the latency of the buffering changes every startup, set the
default to unbuffered mode, though the previous implementation was
enabled buffering.
