Merge audio capture work back into the mainline.

Patched to compile.

alsa: Implemented hotplug support, cleaned up device names.

ios: patched to compile.

alsa: don't enumerate virtual devices, just physical hardware.

Added SDL_PrivateJoystickAdded() and SDL_PrivateJoystickRemoved() Updated the removal code to iterate over all joystick add messages instead of just the first one.

commit 1170112da3776fdb06425f62d57b63144c33dc51 Author: James Zipperer <james.zipperer@synapse.com> Date: Sun Aug 21 01:19:19 2016 -0700 bugfix for controller / joystick add / remove being in the event queue at the same time

Emscripten: Fixed crash if closing removed joystick (thanks, Sylvain!).

Android: Fixed crash if closing removed joystick (thanks, Sylvain!). Fixes fix for Bugzilla #3408.

WinRT: fixed bug where Win10 GameBar, when shown + hidden, might not restore a cursor's hidden state The repro steps were this: 1. run an sdl2 winrt/uwp app, on Win10, v10.0.10586.0 or higher 2. hide the cursor, via a call to SDL_ShowCursor(0) 3. make the Win10 game bar appear, by pressing the Windows + G hotkey 4. observe that the mouse cursor appears, in order to interact with the game bar (this is expected behavior) 5. make the Win10 game bar disappear, either by pressing the Windows + G hotkey again, or clicking somewhere in the app EXPECTED RESULT: cursor disappears, as game bar disappears ACTUAL RESULT: cursor didn't always disappear

Added link in header comment.

Emscripten: Fixed opening previously closed joystick.

Android: Fixed opening previously closed joystick (thanks, Sylvain!). Fixes Bugzilla #3408.

[ OSX ] enables Xbox One S Guide (System Main Menu) button detection. the one possible impact is that since button identifiers on OSX are just their sequence in the HID report descriptor we might change the button order, and any existing/saved mappings may get their order changed.

Add Xbox One controller GUIDs to the XInput filter in the DirectInput joystick driver. The Windows 10 Anniversary Update (1607) breaks the method uses that SDL uses to detect XInput devices. That is, on Windows 10 Anniversary Update, it is no longer possible to query RAWINPUT for HID devices, and check for "IG_" in the device name. Presumably, this will be fixed in the future. This patch works around the issue by adding the Xbox One controller series to the well-known device list. This skips the more expensive RAWINPUT check for those devices, and causes them to be detected as XInput devices once again.

Fixed two old identifiers in header comments.

PSP: Fixed memory leak if video init failed.

WinRT: Removed not needed SDL_zerop() after SDL_calloc(). SDL_calloc() already sets memory to zero.

Added brackets to function names in header comments so that doxygen links them.

testaudiocapture: ask for way more output samples. Fixes Emscripten builds on Chrome for Android.

emscripten: send fake mouse events for touches, like other targets do. (This really should be handled at the higher level and not in the individual targets, but this fixes the immediate bug.)

emscripten audio: check for an "undefined" object, remove some console.log().

audio: Cleaned up "extern AudioBootStrap" list.

audio: Renamed some internal driver symbols in various targets.

android: implement audio capture support.

directsound: Implemented audio capture support.

windows: directsound should also map audio device GUIDs to proper names. Moved this code from winmm into core so both can use it. DirectSound (at least on Win10) also returns truncated device names, even though it's handed in as a string pointer and not a static-sized buffer. :/

audio: Patched to compile on C89 compilers.

emscripten audio: fix timer on capture's silence callback.

directsound: recalculate audiospec size before creating secondary buffer. I think this was a bug before? Maybe I'm misunderstanding this, but it looks like it was working because we allocate room for 8 chunks...

emscripten audio: Added audio capture support.

Added a FIXME.

testaudiocapture: open capture device to same spec as output device. ...since our resampler is still terrible (sorry!).

audio: Only allocate fake_stream if we're using the standard audio threads.

audio: simplifed check for internal callback. Easier to check when it's NULL instead of a list of known internal functions.

dsp: Implemented audio capture support.

winmm: Try to get full device names from the Windows Registry.

winmm: Added a FIXME for truncated device names.

winmm: Implemented audio capture support.

disk audio: Make default i/o delay match what device is meant to be running at.

disk audio: Implemented "capture" support, cleaned up some things.

testaudiocapture: use capture device buffer queueing, for better test coverage.

audio: Implemented buffer queueing for capture devices (SDL_DequeueAudio()).

testaudiocapture: don't use fullscreen for the window.

audio: SDL_ClearQueuedAudio() should free everything but two packets. Otherwise, if you had a massive, one-time queue buildup, the memory from that remains allocated until you close the device. Also, if you are just using a reasonable amount of space, this would previously cause you to reallocate it over and over instead of keeping a little bit of memory around.

nas: initial shot at audio capture support. Compiles, but not tested.

audio: Changed OnlyHasDefaultInputDevice to OnlyHasDefaultCaptureDevice.

audio: changed some SDL_memset() calls to SDL_zero(), other minor corrections.

audio: Removed internal SDL_audiomem.h and macros. I think this was important for SDL 1.2 because some targets needed special device memory for DMA buffers or locked memory buffers for use in hardware interrupts or something, but since it just defines to SDL_malloc and SDL_free now, I took it out for clarity's sake.

audio: Clean up some CloseDevice() interface details. - It's now always called if device->hidden isn't NULL, even if OpenDevice() failed halfway through. This lets implementation code not have to clean up itself on every possible failure point; just return an error and SDL will handle it for you. - Implementations can assume this->hidden != NULL and not check for it. - implementations don't have to set this->hidden = NULL when done, because the caller is always about to free(this). - Don't reset other fields that are in a block of memory about to be free()'d. - Implementations all now free things like internal mix buffers last, after closing devices and such, to guarantee they definitely aren't in use anymore at the point of deallocation.

arts: backed out audio capture support. Turns out that libartsc isn't thread-safe, so if we run a capture and playback device at the same time, it often crashes in arts's internal event loop. We could throw mutexes around the read/write calls, but these are meant to block, so one device could cause serious latency and stutter in the other. Since this audio target isn't in high-demand (Ubuntu hasn't offered a libartsc package for years), I'm just backing out the capture support. If someone needs it, they can pull it out of the revision history.

dummy audio: Patched to compile.

dummy audio: Implemented dummy audio capture support. :)

bsdaudio: first shot at audio capture support! (untested, uncompiled...for now.)

bsdaudio: this appears to be using the wrong variable...? (We probably never noticed because this is meant to block until it fully writes a buffer, and would only trigger an issue if we had a short write that wasn't otherwise an error condition.)

arts: Patched to (maybe) compile.

arts: implemented audio capture support. (completely untested! Not even compiled!!).

alsa: capture devices don't need a mixbuf allocated.

testaudiocapture: made test app interactive. (hold down mouse/finger to record, then it plays back what it heard. Repeat.)

coreaudio: Implemented audio capture for iOS.