From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Sat, 27 Dec 2025 12:03:39 -0800 Subject: Initial commit --- contrib/SDL-3.2.8/src/audio/dummy/SDL_dummyaudio.c | 135 +++++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 contrib/SDL-3.2.8/src/audio/dummy/SDL_dummyaudio.c (limited to 'contrib/SDL-3.2.8/src/audio/dummy/SDL_dummyaudio.c') diff --git a/contrib/SDL-3.2.8/src/audio/dummy/SDL_dummyaudio.c b/contrib/SDL-3.2.8/src/audio/dummy/SDL_dummyaudio.c new file mode 100644 index 0000000..d0f1a1a --- /dev/null +++ b/contrib/SDL-3.2.8/src/audio/dummy/SDL_dummyaudio.c @@ -0,0 +1,135 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2025 Sam Lantinga + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ +#include "SDL_internal.h" + +// Output audio to nowhere... + +#include "../SDL_sysaudio.h" +#include "SDL_dummyaudio.h" + +#if defined(SDL_PLATFORM_EMSCRIPTEN) && !defined(__EMSCRIPTEN_PTHREADS__) +#include +#endif + +static bool DUMMYAUDIO_WaitDevice(SDL_AudioDevice *device) +{ + SDL_Delay(device->hidden->io_delay); + return true; +} + +static bool DUMMYAUDIO_OpenDevice(SDL_AudioDevice *device) +{ + device->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, sizeof(*device->hidden)); + if (!device->hidden) { + return false; + } + + if (!device->recording) { + device->hidden->mixbuf = (Uint8 *) SDL_malloc(device->buffer_size); + if (!device->hidden->mixbuf) { + return false; + } + } + + device->hidden->io_delay = ((device->sample_frames * 1000) / device->spec.freq); + + const char *hint = SDL_GetHint(SDL_HINT_AUDIO_DUMMY_TIMESCALE); + if (hint) { + double scale = SDL_atof(hint); + if (scale >= 0.0) { + device->hidden->io_delay = (Uint32)SDL_round(device->hidden->io_delay * scale); + } + } + + // on Emscripten without threads, we just fire a repeating timer to consume audio. + #if defined(SDL_PLATFORM_EMSCRIPTEN) && !defined(__EMSCRIPTEN_PTHREADS__) + MAIN_THREAD_EM_ASM({ + var a = Module['SDL3'].dummy_audio; + if (a.timers[$0] !== undefined) { clearInterval(a.timers[$0]); } + a.timers[$0] = setInterval(function() { dynCall('vi', $3, [$4]); }, ($1 / $2) * 1000); + }, device->recording ? 1 : 0, device->sample_frames, device->spec.freq, device->recording ? SDL_RecordingAudioThreadIterate : SDL_PlaybackAudioThreadIterate, device); + #endif + + return true; // we're good; don't change reported device format. +} + +static void DUMMYAUDIO_CloseDevice(SDL_AudioDevice *device) +{ + if (device->hidden) { + // on Emscripten without threads, we just fire a repeating timer to consume audio. + #if defined(SDL_PLATFORM_EMSCRIPTEN) && !defined(__EMSCRIPTEN_PTHREADS__) + MAIN_THREAD_EM_ASM({ + var a = Module['SDL3'].dummy_audio; + if (a.timers[$0] !== undefined) { clearInterval(a.timers[$0]); } + a.timers[$0] = undefined; + }, device->recording ? 1 : 0); + #endif + SDL_free(device->hidden->mixbuf); + SDL_free(device->hidden); + device->hidden = NULL; + } +} + +static Uint8 *DUMMYAUDIO_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size) +{ + return device->hidden->mixbuf; +} + +static int DUMMYAUDIO_RecordDevice(SDL_AudioDevice *device, void *buffer, int buflen) +{ + // always return a full buffer of silence. + SDL_memset(buffer, device->silence_value, buflen); + return buflen; +} + +static bool DUMMYAUDIO_Init(SDL_AudioDriverImpl *impl) +{ + impl->OpenDevice = DUMMYAUDIO_OpenDevice; + impl->CloseDevice = DUMMYAUDIO_CloseDevice; + impl->WaitDevice = DUMMYAUDIO_WaitDevice; + impl->GetDeviceBuf = DUMMYAUDIO_GetDeviceBuf; + impl->WaitRecordingDevice = DUMMYAUDIO_WaitDevice; + impl->RecordDevice = DUMMYAUDIO_RecordDevice; + + impl->OnlyHasDefaultPlaybackDevice = true; + impl->OnlyHasDefaultRecordingDevice = true; + impl->HasRecordingSupport = true; + + // on Emscripten without threads, we just fire a repeating timer to consume audio. + #if defined(SDL_PLATFORM_EMSCRIPTEN) && !defined(__EMSCRIPTEN_PTHREADS__) + MAIN_THREAD_EM_ASM({ + if (typeof(Module['SDL3']) === 'undefined') { + Module['SDL3'] = {}; + } + Module['SDL3'].dummy_audio = {}; + Module['SDL3'].dummy_audio.timers = []; + Module['SDL3'].dummy_audio.timers[0] = undefined; + Module['SDL3'].dummy_audio.timers[1] = undefined; + }); + impl->ProvidesOwnCallbackThread = true; + #endif + + return true; +} + +AudioBootStrap DUMMYAUDIO_bootstrap = { + "dummy", "SDL dummy audio driver", DUMMYAUDIO_Init, true, false +}; -- cgit v1.2.3