TODO-HWAccel.md

@@ -7,18 +7,20 @@ av.open(..., hwaccel=True or 'auto')  # automatically set up what it can.
 av.open(..., hwaccel='CUDA')  # use cuda with default options
 av.open(..., hwaccel='/dev/gpu0')  # use whatever device type with the given device
 av.open(..., hwaccel=dict(type='CUDA', device='/dev/gpu0', ...))  # more options
+av.open(..., hwaccel=('CUDA', '/dev/gpu0'))  # shortcut for type and driver
 ```
 
-If there are no options to pass, consider using a tuple to pass the device:
+There are a few options:
+- `vaapi`: `connection_type`, `kernel_driver`, and `driver`;
+- `qsv`: `child_device` (and maybe forwards `kernel_driver` and `driver` to `vaapi`??);
+- `d3d11va`: `debug`.
 
-```
-av.open(..., hwaccel=('CUDA', '/dev/gpu0'))
-```
 
 ## TODO
 - [x] `av.hwdevice.HWDeviceType` enum
 - [x] `av.codec.hwconfig.HWConfig`
 - [x] `av.codec.Codec.hardware_configs` tuple of `HWConfig`
-- [ ] Determine that there are even options to bother passing; it doesn't look like it.
+- [√] Determine that there are even options to bother passing.
+- [ ] What is `AVHWAccel` and can we use it?
 - [ ] Design the `av.open` interface.
 - [ ] Implement it.