diff options
Diffstat (limited to 'Alc/backends/sdl2.cpp')
| -rw-r--r-- | Alc/backends/sdl2.cpp | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/Alc/backends/sdl2.cpp b/Alc/backends/sdl2.cpp new file mode 100644 index 00000000..cf81e1f0 --- /dev/null +++ b/Alc/backends/sdl2.cpp @@ -0,0 +1,291 @@ +/** + * OpenAL cross platform audio library + * Copyright (C) 2018 by authors. + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * Or go to http://www.gnu.org/copyleft/lgpl.html + */ + +#include "config.h" + +#include <stdlib.h> +#include <SDL2/SDL.h> + +#include <string> + +#include "alMain.h" +#include "alu.h" +#include "threads.h" +#include "compat.h" + +#include "backends/base.h" + + +#ifdef _WIN32 +#define DEVNAME_PREFIX "OpenAL Soft on " +#else +#define DEVNAME_PREFIX "" +#endif + +struct ALCsdl2Backend final : public ALCbackend { + SDL_AudioDeviceID deviceID; + ALsizei frameSize; + + ALuint Frequency; + enum DevFmtChannels FmtChans; + enum DevFmtType FmtType; + ALuint UpdateSize; +}; + +static void ALCsdl2Backend_Construct(ALCsdl2Backend *self, ALCdevice *device); +static void ALCsdl2Backend_Destruct(ALCsdl2Backend *self); +static ALCenum ALCsdl2Backend_open(ALCsdl2Backend *self, const ALCchar *name); +static ALCboolean ALCsdl2Backend_reset(ALCsdl2Backend *self); +static ALCboolean ALCsdl2Backend_start(ALCsdl2Backend *self); +static void ALCsdl2Backend_stop(ALCsdl2Backend *self); +static DECLARE_FORWARD2(ALCsdl2Backend, ALCbackend, ALCenum, captureSamples, void*, ALCuint) +static DECLARE_FORWARD(ALCsdl2Backend, ALCbackend, ALCuint, availableSamples) +static DECLARE_FORWARD(ALCsdl2Backend, ALCbackend, ClockLatency, getClockLatency) +static void ALCsdl2Backend_lock(ALCsdl2Backend *self); +static void ALCsdl2Backend_unlock(ALCsdl2Backend *self); +DECLARE_DEFAULT_ALLOCATORS(ALCsdl2Backend) + +DEFINE_ALCBACKEND_VTABLE(ALCsdl2Backend); + +static const ALCchar defaultDeviceName[] = DEVNAME_PREFIX "Default Device"; + +static void ALCsdl2Backend_Construct(ALCsdl2Backend *self, ALCdevice *device) +{ + new (self) ALCsdl2Backend{}; + ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device); + SET_VTABLE2(ALCsdl2Backend, ALCbackend, self); + + self->deviceID = 0; + self->frameSize = FrameSizeFromDevFmt(device->FmtChans, device->FmtType, device->AmbiOrder); + self->Frequency = device->Frequency; + self->FmtChans = device->FmtChans; + self->FmtType = device->FmtType; + self->UpdateSize = device->UpdateSize; +} + +static void ALCsdl2Backend_Destruct(ALCsdl2Backend *self) +{ + if(self->deviceID) + SDL_CloseAudioDevice(self->deviceID); + self->deviceID = 0; + + ALCbackend_Destruct(STATIC_CAST(ALCbackend, self)); + self->~ALCsdl2Backend(); +} + + +static void ALCsdl2Backend_audioCallback(void *ptr, Uint8 *stream, int len) +{ + ALCsdl2Backend *self = static_cast<ALCsdl2Backend*>(ptr); + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + + assert((len % self->frameSize) == 0); + aluMixData(device, stream, len / self->frameSize); +} + +static ALCenum ALCsdl2Backend_open(ALCsdl2Backend *self, const ALCchar *name) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + SDL_AudioSpec want, have; + + SDL_zero(want); + SDL_zero(have); + + want.freq = device->Frequency; + switch(device->FmtType) + { + case DevFmtUByte: want.format = AUDIO_U8; break; + case DevFmtByte: want.format = AUDIO_S8; break; + case DevFmtUShort: want.format = AUDIO_U16SYS; break; + case DevFmtShort: want.format = AUDIO_S16SYS; break; + case DevFmtUInt: /* fall-through */ + case DevFmtInt: want.format = AUDIO_S32SYS; break; + case DevFmtFloat: want.format = AUDIO_F32; break; + } + want.channels = (device->FmtChans == DevFmtMono) ? 1 : 2; + want.samples = device->UpdateSize; + want.callback = ALCsdl2Backend_audioCallback; + want.userdata = self; + + /* Passing nullptr to SDL_OpenAudioDevice opens a default, which isn't + * necessarily the first in the list. + */ + if(!name || strcmp(name, defaultDeviceName) == 0) + self->deviceID = SDL_OpenAudioDevice(nullptr, SDL_FALSE, &want, &have, + SDL_AUDIO_ALLOW_ANY_CHANGE); + else + { + const size_t prefix_len = strlen(DEVNAME_PREFIX); + if(strncmp(name, DEVNAME_PREFIX, prefix_len) == 0) + self->deviceID = SDL_OpenAudioDevice(name+prefix_len, SDL_FALSE, &want, &have, + SDL_AUDIO_ALLOW_ANY_CHANGE); + else + self->deviceID = SDL_OpenAudioDevice(name, SDL_FALSE, &want, &have, + SDL_AUDIO_ALLOW_ANY_CHANGE); + } + if(self->deviceID == 0) + return ALC_INVALID_VALUE; + + device->Frequency = have.freq; + if(have.channels == 1) + device->FmtChans = DevFmtMono; + else if(have.channels == 2) + device->FmtChans = DevFmtStereo; + else + { + ERR("Got unhandled SDL channel count: %d\n", (int)have.channels); + return ALC_INVALID_VALUE; + } + switch(have.format) + { + case AUDIO_U8: device->FmtType = DevFmtUByte; break; + case AUDIO_S8: device->FmtType = DevFmtByte; break; + case AUDIO_U16SYS: device->FmtType = DevFmtUShort; break; + case AUDIO_S16SYS: device->FmtType = DevFmtShort; break; + case AUDIO_S32SYS: device->FmtType = DevFmtInt; break; + case AUDIO_F32SYS: device->FmtType = DevFmtFloat; break; + default: + ERR("Got unsupported SDL format: 0x%04x\n", have.format); + return ALC_INVALID_VALUE; + } + device->UpdateSize = have.samples; + device->NumUpdates = 2; /* SDL always (tries to) use two periods. */ + + self->frameSize = FrameSizeFromDevFmt(device->FmtChans, device->FmtType, device->AmbiOrder); + self->Frequency = device->Frequency; + self->FmtChans = device->FmtChans; + self->FmtType = device->FmtType; + self->UpdateSize = device->UpdateSize; + + alstr_copy_cstr(&device->DeviceName, name ? name : defaultDeviceName); + + return ALC_NO_ERROR; +} + +static ALCboolean ALCsdl2Backend_reset(ALCsdl2Backend *self) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + device->Frequency = self->Frequency; + device->FmtChans = self->FmtChans; + device->FmtType = self->FmtType; + device->UpdateSize = self->UpdateSize; + device->NumUpdates = 2; + SetDefaultWFXChannelOrder(device); + return ALC_TRUE; +} + +static ALCboolean ALCsdl2Backend_start(ALCsdl2Backend *self) +{ + SDL_PauseAudioDevice(self->deviceID, 0); + return ALC_TRUE; +} + +static void ALCsdl2Backend_stop(ALCsdl2Backend *self) +{ + SDL_PauseAudioDevice(self->deviceID, 1); +} + +static void ALCsdl2Backend_lock(ALCsdl2Backend *self) +{ + SDL_LockAudioDevice(self->deviceID); +} + +static void ALCsdl2Backend_unlock(ALCsdl2Backend *self) +{ + SDL_UnlockAudioDevice(self->deviceID); +} + + +struct ALCsdl2BackendFactory final : public ALCbackendFactory { + ALCsdl2BackendFactory() noexcept; +}; + +ALCbackendFactory *ALCsdl2BackendFactory_getFactory(void); + +static ALCboolean ALCsdl2BackendFactory_init(ALCsdl2BackendFactory *self); +static void ALCsdl2BackendFactory_deinit(ALCsdl2BackendFactory *self); +static ALCboolean ALCsdl2BackendFactory_querySupport(ALCsdl2BackendFactory *self, ALCbackend_Type type); +static void ALCsdl2BackendFactory_probe(ALCsdl2BackendFactory *self, enum DevProbe type, al_string *outnames); +static ALCbackend* ALCsdl2BackendFactory_createBackend(ALCsdl2BackendFactory *self, ALCdevice *device, ALCbackend_Type type); +DEFINE_ALCBACKENDFACTORY_VTABLE(ALCsdl2BackendFactory); + + +ALCsdl2BackendFactory::ALCsdl2BackendFactory() noexcept + : ALCbackendFactory{GET_VTABLE2(ALCsdl2BackendFactory, ALCbackendFactory)} +{ } + +ALCbackendFactory *ALCsdl2BackendFactory_getFactory(void) +{ + static ALCsdl2BackendFactory factory{}; + return STATIC_CAST(ALCbackendFactory, &factory); +} + + +static ALCboolean ALCsdl2BackendFactory_init(ALCsdl2BackendFactory* UNUSED(self)) +{ + if(SDL_InitSubSystem(SDL_INIT_AUDIO) == 0) + return AL_TRUE; + return ALC_FALSE; +} + +static void ALCsdl2BackendFactory_deinit(ALCsdl2BackendFactory* UNUSED(self)) +{ + SDL_QuitSubSystem(SDL_INIT_AUDIO); +} + +static ALCboolean ALCsdl2BackendFactory_querySupport(ALCsdl2BackendFactory* UNUSED(self), ALCbackend_Type type) +{ + if(type == ALCbackend_Playback) + return ALC_TRUE; + return ALC_FALSE; +} + +static void ALCsdl2BackendFactory_probe(ALCsdl2BackendFactory* UNUSED(self), enum DevProbe type, al_string *outnames) +{ + if(type != ALL_DEVICE_PROBE) + return; + + int num_devices{SDL_GetNumAudioDevices(SDL_FALSE)}; + + alstr_append_range(outnames, defaultDeviceName, defaultDeviceName+sizeof(defaultDeviceName)); + for(int i{0};i < num_devices;++i) + { + std::string name{DEVNAME_PREFIX}; + name += SDL_GetAudioDeviceName(i, SDL_FALSE); + if(!name.empty()) + { + const char *namestr{name.c_str()}; + alstr_append_range(outnames, namestr, namestr+name.length()+1); + } + } +} + +static ALCbackend* ALCsdl2BackendFactory_createBackend(ALCsdl2BackendFactory* UNUSED(self), ALCdevice *device, ALCbackend_Type type) +{ + if(type == ALCbackend_Playback) + { + ALCsdl2Backend *backend; + NEW_OBJ(backend, ALCsdl2Backend)(device); + if(!backend) return nullptr; + return STATIC_CAST(ALCbackend, backend); + } + + return nullptr; +} |