src/audio/SDL_audio.c


Log

Author Commit Date CI Message
Lee Salzman 7d90df0e 2021-08-29T15:24:23 Restore previous behavior of empty SDL_AUDIODRIVER trying all drivers. The recent change to make SDL_AUDIODRIVER support comma-separated lists broke the previous behavior where an SDL_AUDIODRIVER that was empty behaved the same as if it was not set at all. This old behavior was necessary to paper over differences in platforms where SDL_setenv may or may not actually delete the env var if an empty string is specified. This patch just adds a simple check to ensure SDL_AUDIODRIVER is not empty before using it, restoring the old interpretation of the empty var.
David Gow 3261f7f6 2021-08-26T16:15:30 audio: Support "pulse" as an alias for "pulseaudio" Originally, SDL 1.2 used "pulse" as the name for its PulseAudio driver. While it now supports "pulseaudio" as well for compatibility with SDL 2.0 [1], there are still scripts and distro packages which set SDL_AUDIODRIVER=pulse [2]. While it's possible to remove this in most circumstances or replace it with "pulseaudio" or a comma-separated list, this may still conflict if the environment variable is set globally and old binary builds of SDL 1.2 (e.g. packaged with older games) are being used. To fix this on SDL 2.0, add a hardcoded check for "pulse" as an audio driver name, and replace it with "pulseaudio". This mimics what SDL 1.2 does (but in reverse). Note that setting driver_attempt{,_len} is safe here as they're reset correctly based on driver_attempt_end on the next loop. [1] https://github.com/libsdl-org/SDL-1.2/commit/d9514097846381cd30fe08df65dbdd48de92a058 [2] https://bugzilla.opensuse.org/show_bug.cgi?id=1189778
Sam Lantinga a0af7ce7 2021-08-10T15:05:49 OSS is no longer the preferred audio backend on modern UNIX systems Fixes https://github.com/libsdl-org/SDL/issues/4207
Sebastian Krzyszkowiak 25f9ed87 2021-08-10T13:10:36 audio: Fix false positives in driver name comparison Without this change, driver names don't get matched correctly; for example "a" can get matched with "alsa" since it only checks whether the string matches up to the length of the requested driver name.
Luis Cáceres 45de0a1d 2021-04-02T06:28:10 Support comma-separated lists in SDL_AUDIODRIVER
Sylvain f1fab24e 2021-04-15T21:00:00 AAudio: add bootstrap in SDL_audio.c
Ethan Lee 9d294f1f 2021-03-27T00:53:10 audio: Allow AudioStreamGet to return 0 in RunAudio. While we should normally expect _something_ from the stream based on the AudioStreamAvailable check, it's possible for a device change to flush the stream at an inconvenient time, causing this function to return 0. Thing is, this is harmless. Either data will be NULL and the result won't matter anyway, or the data buffer will be zeroed out and the output will just be silence for the brief moment that the device change is occurring. Both scenarios work themselves out, and testing on Windows shows that this behavior is safe.
Ivan Epifanov 2d64e37e 2020-11-02T18:09:43 Initial rebase of xerpi's port
Ethan Lee 67e8522d 2021-02-27T17:37:25 Add SDL_GetAudioDeviceSpec. This API is supported by pipewire, pulseaudio, coreaudio, wasapi, and disk.
Ozkan Sezer ac8a3fda 2021-03-03T20:33:20 fix prepare_audiospec() possibly missing a bad SDL_AUDIO_CHANNELS env.
Frank Praznik adc0a931 2021-02-24T14:08:08 audio: Move Pipewire bootstrap after Jack Move the Pipewire audio driver below others in the list so it won't be mistakenly initialized when it's not the system mixer.
Frank Praznik 2f0b99a7 2021-02-13T11:56:05 audio: Add Pipewire playback/capture sink
Sam Lantinga 9130f7c3 2021-01-02T10:25:38 Updated copyright for 2021
Ozkan Sezer d2723875 2020-10-14T23:01:06 os2: integrate the port into main tree.
Manuel V?gele 554037a6 2020-09-26T09:30:08 audio: fix popping sounds caused by signed/unsigned conversion When converting audio from signed to unsigned values of vice-versa the silence value chosen by SDL was the value of the device, not of the stream that the data was being put into. After conversion this would lead to a very high or low value, making the speaker jump to a extreme positon, leading to an audible noise whenever creating, destroying or playing scilence on a device that reqired such conversion.
Sam Lantinga 4bb95e84 2020-02-11T16:14:02 Implemented OpenSL-ES audio recording on Android
Ryan C. Gordon f30ef6ed 2020-01-21T17:40:16 audio: Fixed a '//' style comment.
Ryan C. Gordon dbe5c14b 2020-01-21T15:49:37 audio: Calculate a legitimate SDL_AudioSpec::silence in SDL_LoadWAV_RW().
Sam Lantinga a8780c6a 2020-01-16T20:49:25 Updated copyright date for 2020
Ryan C. Gordon aef1ed4a 2019-09-25T15:40:27 audio: Set (something close to) the correct silence value for U16 audio. Partially fixes Bugzilla #4805.
Ozkan Sezer 7a47c292 2019-07-31T01:22:02 Fix bug 4746 - introduce SDL_zeroa macro.
Sam Lantinga 723d0143 2019-06-04T17:32:15 Fixed bug 4171 - SDL_GetQueuedAudioSize is broken with WASAPI Cameron Gutman I was trying to use SDL_GetQueuedAudioSize() to ensure my audio latency didn't get too high while streaming data in from the network. If I get more than N frames of audio queued, I know that the network is giving me more data than I can play and I need to drop some to keep latency low. This doesn't work well on WASAPI out of the box, due to the addition of GetPendingBytes() to the amount of queued data. As a terrible hack, I loop 100 times calling SDL_Delay(10) and SDL_GetQueuedAudioSize() before I ever call SDL_QueueAudio() to get a "baseline" amount that I then subtract from SDL_GetQueuedAudioSize() later. However, because this value isn't actually a constant, this hack can cause SDL_GetQueuedAudioSize() - baselineSize to be < 0. This means I have no accurate way of determining how much data is actually queued in SDL's audio buffer queue. The SDL_GetQueuedAudioSize() documentation says: "This is the number of bytes that have been queued for playback with SDL_QueueAudio(), but have not yet been sent to the hardware." Yet, SDL_GetQueuedAudioSize() returns > 0 value when SDL_QueueAudio() has never been called. Based on that documentation, I believe the current behavior contradicts the documented behavior of this function and should be changed in line with Boris's patch. I understand that exposing the IAudioClient::GetCurrentPadding() value is useful, but a solution there needs to take into account what of that data is silence inserted by SDL and what is actual data queued by the user with SDL_QueueAudio(). Until that happens, I think the best approach is to remove the GetPendingBytes() call until SDL is able to keep track of queued data to make sense of it. This would make SDL_GetQueuedAudioSize() possible to use accurately with WASAPI.
Sam Lantinga f3e76ea1 2019-05-23T13:47:30 Use the OpenSL ES audio driver by default on Android, as it has the lowest latency.
Ryan C. Gordon 6a3356ab 2019-03-25T12:24:38 Backed out changeset cec31de4e126 This was meant to migrate CoreAudio onto the same SDL_RunAudio() path that most other audio drivers are on, but it introduced a bug because it doesn't deal with dropped audio buffers...and fixing that properly just introduces latency. I might revisit this later, perhaps by reworking SDL_RunAudio to allow for this sort of API better, or redesigning the whole subsystem or something, I don't know. I'm not super-thrilled that this has to exist outside of the usual codepaths, though. Fixes Bugzilla #4481.
Sam Lantinga 7dc92a76 2019-01-12T12:18:44 Initial Android OpenSL ES implementation, contributed by ANTA
Sylvain Becker d23c2f07 2019-01-10T18:05:56 Fixed bug 3930 - Android, set thread priorities and names SDLActivity thread priority is unchanged, by default -10 (THREAD_PRIORITY_VIDEO). SDLAudio thread priority was -4 (SDL_SetThreadPriority was ignored) and is now -16 (THREAD_PRIORITY_AUDIO). SDLThread thread priority was 0 (THREAD_PRIORITY_DEFAULT) and is -4 (THREAD_PRIORITY_DISPLAY).
Sam Lantinga 5e13087b 2019-01-04T22:01:14 Updated copyright for 2019
Ryan C. Gordon 04cbf132 2018-10-10T15:20:56 audio: All device names reported by SDL must be unique. This means that if you have two devices named "Soundblaster Pro" in your machine, one will be reported as "Soundblaster Pro" and the other as "Soundblaster Pro (2)". This makes it so you can't into a position where one of your devices can't be opened because another is sitting on the same name.
Ryan C. Gordon 0378529e 2018-10-10T14:55:24 audio: clean_out_device_list() already sets this flag to false for us.
Sam Lantinga f5a21ebf 2018-10-09T20:12:43 Added support for surround sound and float audio on Android
Sam Lantinga b2518761 2018-10-01T09:47:10 commit c6b28f46b8116552ec2b38d1d3c8535df28ba7a1 Author: Anthony Pesch <inolen@gmail.com> Date: Fri May 4 20:21:21 2018 -0400 Added SDL_AUDIO_ALLOW_SAMPLES_CHANGE flag enabling users of SDL_OpenAudioDevice to get the sample size of the actual hardware buffer vs having a stream created to handle the delta
Ryan C. Gordon 56f44cfa 2018-08-07T13:04:15 audio: Deal with device shutdown more carefully. This would cause problems in various ways, but specifically triggers an assert when you close a WASAPI capture device in an app running over RDP. Related to (but not the actual bug) in Bugzilla #3924.
Sam Lantinga f521b22e 2018-04-23T22:07:56 Added SDL_THREAD_PRIORITY_TIME_CRITICAL
Ryan C. Gordon dc8b55e5 2018-04-16T02:11:09 coreaudio: Use the standard SDL audio thread instead of spinning a new one. Fixes corner cases, like the audio callback not firing if the device is disconnected, etc.
sezero 40b27fd5 2018-02-12T17:00:00 revert the recent typecast assignment changes (see bug #4079) also change the void* typedefs for the two vulkan function pointers added in vulkan_internal.h into generic function pointer typedefs.
Sam Lantinga 90e72bf4 2018-01-30T18:08:34 Fixed ISO C99 compatibility SDL now builds with gcc 7.2 with the following command line options: -Wall -pedantic-errors -Wno-deprecated-declarations -Wno-overlength-strings --std=c99
Sam Lantinga e3cc5b2c 2018-01-03T10:03:25 Updated copyright for 2018
Ryan C. Gordon 351d6d47 2017-12-06T12:24:32 audio: Port WASAPI to WinRT, remove XAudio2 backend. XAudio2 doesn't have capture support, so WASAPI was to replace it; the holdout was WinRT, which still needed it as its primary audio target until the WASAPI code code be made to work. The support matrix now looks like: WinXP: directsound by default, winmm as a fallback for buggy drivers. Vista+: WASAPI (directsound and winmm as fallbacks for debugging). WinRT: WASAPI
Ryan C. Gordon 1a3b95a1 2017-09-21T02:51:14 audio: Replaced the resampler. Again. This time it's using real math from a real whitepaper instead of my previous amateur, fast-but-low-quality attempt. The new resampler does "bandlimited interpolation," as described here: https://ccrma.stanford.edu/~jos/resample/ The output appears to sound cleaner, especially at high frequencies, and of course works with non-power-of-two rate conversions. There are some obvious optimizations to be done to this still, and there is other fallout: this doesn't resample a buffer in-place, the 2-channels-Sint16 fast path is gone because this resampler does a _lot_ of floating point math. There is a nasty hack to make it work with SDL_AudioCVT. It's possible these issues are solvable, but they aren't solved as of yet. Still, I hope this effort is slouching in the right direction.
Sam Lantinga d619d885 2017-08-28T21:42:39 Fixed bug 3662 - Error message when using the audio conversion setup without an initialized audio subsystem is a bit vague Simon Hug This issue actually raises the question if this API change (requirement of initialized audio subsystem) is breaking backwards compatibility. I don't see the documentation saying it is needed in 2.0.5.
Sam Lantinga 8e7998e1 2017-08-27T19:10:30 Fixed bug 3710 - SDL_OpenAudio(desired, obtained) doesn't update desired's size when obtained is NULL David Ludwig I've created a new set of patches. I am happy to create more, if it would help. One version only copies 'size'. A second version copies both 'size' and 'silence'. When looking over the documentation for SDL_OpenAudio in SDL_audio.h, it mentioned that both 'size' and 'silence' were things that SDL_OpenAudio would calculate. Regarding *both* patches, I did notice that SDL 1.2 appears to have always modified desired's size and silence fields. The SDL wiki, at https://wiki.libsdl.org/SDL_OpenAudio#Remarks , does note:
Sam Lantinga 96305832 2017-08-11T10:21:19 Fixed bug 3702 - Clear error messages of SDL_LoadObject for optional libraries Simon Hug Some code in SDL loads libraries with SDL_LoadObject to get more information or use newer APIs. SDL_LoadObject may fail, set an error message and SDL will continue with some fallback code. Since SDL will overwrite the error or exit the function with a return value that indicates success, the error form SDL_LoadObject for the optional stuff might as well be cleared right away.
Ryan C. Gordon d9039f23 2017-06-08T13:27:58 jack: Initial shot at a JACK audio target. http://jackaudio.org/ Fixes Bugzilla #2163. (with several more commits following to improve this code.)
Ryan C. Gordon a7fc2822 2017-05-24T19:56:59 audio: rename bsd target to netbsd. Apparently this is no longer a generic BSD audio target, and hasn't been for years, so rename it for NetBSD.
Ryan C. Gordon 4073a669 2017-05-18T15:33:17 audio: One more callbackspec fix (thanks, Simon!).
Ryan C. Gordon 226541cb 2017-04-26T01:43:40 audio: another wrong struct that causes NULL pointer crash (thanks, Simon!). Fixes Bugzilla #3632.
Juha Kuikka 7382cebb 2017-04-20T21:25:29 audio: Fix audio queue functions to use new spec structure. Using the old spec structure causes the audio queueing functions to fail due to bad callback pointers being checked.
Sam Lantinga d20d426c 2017-04-18T22:17:40 Fix crash in SDL audio thread, by Juha Kuikka Wrong audio spec structure was populated with the internal callback, causing the audio thread to call a NULL pointer.
Ryan C. Gordon c85c57a0 2017-03-29T14:23:39 wasapi: Handle lost audio device endpoints. This gracefully recovers when a device format is changed, and will switch to the new default device if the current one is unplugged, etc. This does not handle when a new default device is added; it only notices if the current default goes away. That will be fixed by implementing the stubbed-out MMNotificationClient_OnDefaultDeviceChanged() function.
Sam Lantinga c4d54504 2017-03-14T07:16:56 differentiate between capture / playback audio thread names
Ryan C. Gordon a4249b48 2017-02-26T00:56:13 Patched to compile on C89 compilers.
Ryan C. Gordon 3b9e4d0a 2017-02-26T00:39:22 audio: Try to keep callbacks firing at normal pace when device is lost.
Ryan C. Gordon a366c35f 2017-02-26T00:12:33 audio: run the audio callback even if device was lost. We will throw away the data anyhow, but some apps depend on the callback firing to make progress; testmultiaudio.c, if nothing else, is an example of this. Capture also will now fire the callback in these conditions, offering nothing but silence. Apps can check SDL_GetAudioDeviceStatus() or listen for the SDL_AUDIODEVICEREMOVED event if they want to gracefully deal with an opened audio device that has been unexpectedly lost.
Ryan C. Gordon 5728cb20 2017-02-26T00:10:02 audio: Make sure the disk and dummy targets are the last ones we try to init.
Ryan C. Gordon 6046fd4c 2017-02-14T03:03:27 wasapi: Initial WASAPI support, for Windows Vista and later. This should remain binary compatible with Windows XP, as we dynamically load anything we need and fall back to DirectSound/WinMM/XAudio2 if not available.
Ryan C. Gordon 175f1e8f 2017-02-13T16:55:00 audio: Added a ThreadDeinit() method to match ThreadInit. Not used by any targets at the moment, but will be shortly!
Sam Lantinga 886736a2 2017-02-11T16:38:16 Fixed bug 3584 - Small stack size for audio callback thread Walter van Niftrik We have found that since SDL 2.0.5 the audio callback thread is created with a very small stack size. In our application this is leading to stack overflows. We believe there is a bug at http://hg.libsdl.org/SDL/file/391fd532f79e/src/audio/SDL_audio.c#l1132, where the is_internal_thread flag appears to be inverted.
Sam Lantinga ede5c734 2017-01-24T19:38:01 Generalized the audio resampling hint for other resampling methods in the future
Ryan C. Gordon c7f9dcb6 2017-01-24T15:52:22 audio: Offer a hint for libsamplerate quality/speed tradeoff. This defaults to the internal SDL resampler, since that's the likely default without a system-wide install of libsamplerate, but those that need more can tweak this.
Ryan C. Gordon 57182930 2017-01-16T00:58:28 audio: Implemented SIMD support for audio data type converters. This currently adds an SSE2 implementation (but it's #ifdef'd out for now, until it's hooked up to the configure script and such).
Ryan C. Gordon a41103b1 2017-01-09T05:59:30 audio: Patched to compile if linking directly to libsamplerate.
Ryan C. Gordon 35166609 2017-01-08T14:28:44 audio: Patched to compile with libsamplerate support (again).
Ryan C. Gordon 19e937fc 2017-01-08T14:18:03 audio: libsamplerate loading now happens once at init time.
Sam Lantinga 37f404fb 2017-01-06T00:47:42 Fixed confusion between Ryan's new audio stream and the audio buffer we were calling stream in the callback
Ryan C. Gordon 748f4605 2017-01-06T03:38:14 audio: Add an assert to make sure non-streaming audio uses good buffer sizes.
Ryan C. Gordon b3e8db80 2017-01-06T01:07:34 audio: rename fake_stream to work_buffer. It's more than an alternative for when the OS can't provide a DMA buffer, now.
Ryan C. Gordon 992124d4 2017-01-06T01:02:58 audio: Fixed SDL_AudioStreamGet() function parameters. There was a draft of this where it did audio conversion into the final buffer, if there was enough room available past what you asked for, but that interface got removed, so the parameters didn't make sense (and we were using the wrong one in any case, too!).
Ryan C. Gordon f07a1a5a 2017-01-05T21:31:02 emscriptenaudio: Reworked to use SDL_AudioStream.
Ryan C. Gordon 3761b5f6 2017-01-05T20:11:19 Fixed a few compiler warnings.
Ryan C. Gordon 30178a9b 2017-01-05T19:29:38 audio: Added SDL_AudioStream. Non-power-of-two resampling now works!
Sam Lantinga 45b774e3 2017-01-01T18:33:28 Updated copyright for 2017
Sam Lantinga b2f6c4c1 2016-12-19T11:15:53 Fixed bus error when converting 16-bit to float for non-integral-multiple sample rates
Ryan C. Gordon c0231875 2016-12-06T12:23:17 audio: Fixed compiler warnings.
Ryan C. Gordon a0e003ee 2016-12-06T02:23:54 Refactored the audio queueing code to a generic SDL_DataQueue interface. This is not a public API (at the moment), but we will be needing this for other internal things soon.
Sam Lantinga 57d01d7d 2016-11-13T22:57:41 Patch from Sylvain to fix clang warnings
Ryan C. Gordon 7d2108ce 2016-10-07T19:39:43 audio: Backed out the audio-thread detaching changes. It added a ton of complexity. A simpler solution might arise at some point though.
Ryan C. Gordon f6a280ab 2016-10-07T15:13:46 audio: Don't trust audio drivers to drain pending audio. This tends to be a frequent spot where drivers hang, and the waits were often unreliable in any case. Instead, our audio thread now alerts the driver that we're done streaming audio (which currently XAudio2 uses to alert the system not to warn about the impending underflow) and then SDL_Delay()'s for a duration that's reasonable to drain the DMA buffers before closing the device.
Ryan C. Gordon 551cdc8d 2016-10-07T14:42:24 audio: better way to calculate buffer drain wait times.
Ryan C. Gordon 76f48acf 2016-10-07T14:35:25 audio: threading and device hang improvements. This tries to make SDL robust against device drivers that have hung up, apps don't freeze in catastrophic (but not necessarily uncommon) conditions. Now we detach the audio thread and let it clean up and don't care if it never actually runs to completion.
Sam Lantinga 9257b72d 2016-10-05T00:12:16 Backed out a very unsafe change that was trying to prevent audio hang at quit. Ryan and I have ideas on a better way to handle this.
Sam Lantinga bac61096 2016-10-04T06:48:07 ensure SDL_AUDIODEVICEREMOVED gets sent when hotplug removes a device James Zipperer The problem I was seeing was that the the ALSA hotplug thread would call SDL_RemoveAudioDevice, but my application code was not seeing an SDL_AUDIODEVICEREMOVED event to go along with it. To fix it, I added some code into SDL_RemoveAudioDevice to call SDL_OpenedAudioDeviceDisconnected on the corresponding open audio device. There didn't appear to be a way to cross reference the handle that SDL_RemoveAudioDevice gets and the SDL_AudioDevice pointer that SDL_OpenedAudioDeviceDisconnected needs, so I ended up adding a void *handle field to struct SDL_AudioDevice so that I could do the cross reference. Is there some other way beside adding a void *handle field to the struct to get the proper information for SDL_OpenedAudioDeviceDisconnected?
Sam Lantinga 69cf1703 2016-10-04T06:46:46 fix deadlock on close device James Zipperer snd_pcm_drain doesn't always drain when you unplug a usb device. Use snd_pcm_drop instead
Sam Lantinga 2558c9c8 2016-10-04T06:45:28 fix audio deadlock James Zipperer Close the audio device before waiting for the audio thread to complete, which fixes a situation where the audio thread never completes Add an additional check in the audio thread to see if the device is enabled and bail out if the device is no longer enabled
Ryan C. Gordon e435659c 2016-08-11T22:26:58 audio: Cleaned up "extern AudioBootStrap" list.
Ryan C. Gordon 6f4bcd24 2016-08-11T22:22:09 audio: Renamed some internal driver symbols in various targets.
Ryan C. Gordon b879595a 2016-08-10T14:14:14 audio: Patched to compile on C89 compilers.
Ryan C. Gordon a05bde21 2016-08-09T00:44:59 audio: Only allocate fake_stream if we're using the standard audio threads.
Ryan C. Gordon be8d7a46 2016-08-09T00:44:05 audio: simplifed check for internal callback. Easier to check when it's NULL instead of a list of known internal functions.
Ryan C. Gordon 978df1ad 2016-08-06T03:39:15 disk audio: Implemented "capture" support, cleaned up some things.
Ryan C. Gordon 73153901 2016-08-06T02:47:27 audio: Implemented buffer queueing for capture devices (SDL_DequeueAudio()).
Ryan C. Gordon e7347a40 2016-08-06T02:27:55 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.
Ryan C. Gordon 9b2a59ef 2016-08-05T02:04:48 audio: Changed OnlyHasDefaultInputDevice to OnlyHasDefaultCaptureDevice.
Ryan C. Gordon 9b647727 2016-08-05T01:44:41 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.
Ryan C. Gordon 979de761 2016-08-05T01:44:15 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.
Ryan C. Gordon 6bd1ec6b 2016-08-02T15:04:33 audio: a little more robustness in the capture device's thread.
Ryan C. Gordon 0d0f7080 2016-08-02T13:50:21 audio: implemented higher level infrastructure for running capture devices.
Ryan C. Gordon 6d5c9c1e 2016-08-02T13:48:52 audio: Made some SDL_AudioDevice fields atomic. This makes sure they're properly communicated to the audio threads.
Ryan C. Gordon 67f2538c 2016-08-01T13:32:27 audio: changed some internal ints to be SDL_bools.
Ryan C. Gordon c754662d 2016-08-01T11:45:45 audio: Make SDL_AudioDevice::shutdown an atomic value. Just to make sure this get communicated to the audio thread properly.
Ryan C. Gordon ee099750 2016-08-01T00:18:56 audio: Initial bits to enable audio capture support.