🛠️🐜 Antkeeper superbuild with dependencies included
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221 lines
6.5 KiB
221 lines
6.5 KiB
/**
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* OpenAL cross platform audio library
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* Copyright (C) 2018 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include "sdl2.h"
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#include <cassert>
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#include <cstdlib>
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#include <cstring>
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#include <string>
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#include "almalloc.h"
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#include "alnumeric.h"
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#include "core/device.h"
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#include "core/logging.h"
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#include <SDL2/SDL.h>
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namespace {
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#ifdef _WIN32
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#define DEVNAME_PREFIX "OpenAL Soft on "
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#else
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#define DEVNAME_PREFIX ""
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#endif
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constexpr char defaultDeviceName[] = DEVNAME_PREFIX "Default Device";
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struct Sdl2Backend final : public BackendBase {
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Sdl2Backend(DeviceBase *device) noexcept : BackendBase{device} { }
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~Sdl2Backend() override;
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void audioCallback(Uint8 *stream, int len) noexcept;
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static void audioCallbackC(void *ptr, Uint8 *stream, int len) noexcept
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{ static_cast<Sdl2Backend*>(ptr)->audioCallback(stream, len); }
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void open(const char *name) override;
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bool reset() override;
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void start() override;
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void stop() override;
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SDL_AudioDeviceID mDeviceID{0u};
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uint mFrameSize{0};
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uint mFrequency{0u};
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DevFmtChannels mFmtChans{};
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DevFmtType mFmtType{};
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uint mUpdateSize{0u};
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DEF_NEWDEL(Sdl2Backend)
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};
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Sdl2Backend::~Sdl2Backend()
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{
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if(mDeviceID)
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SDL_CloseAudioDevice(mDeviceID);
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mDeviceID = 0;
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}
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void Sdl2Backend::audioCallback(Uint8 *stream, int len) noexcept
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{
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const auto ulen = static_cast<unsigned int>(len);
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assert((ulen % mFrameSize) == 0);
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mDevice->renderSamples(stream, ulen / mFrameSize, mDevice->channelsFromFmt());
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}
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void Sdl2Backend::open(const char *name)
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{
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SDL_AudioSpec want{}, have{};
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want.freq = static_cast<int>(mDevice->Frequency);
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switch(mDevice->FmtType)
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{
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case DevFmtUByte: want.format = AUDIO_U8; break;
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case DevFmtByte: want.format = AUDIO_S8; break;
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case DevFmtUShort: want.format = AUDIO_U16SYS; break;
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case DevFmtShort: want.format = AUDIO_S16SYS; break;
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case DevFmtUInt: /* fall-through */
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case DevFmtInt: want.format = AUDIO_S32SYS; break;
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case DevFmtFloat: want.format = AUDIO_F32; break;
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}
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want.channels = (mDevice->FmtChans == DevFmtMono) ? 1 : 2;
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want.samples = static_cast<Uint16>(minu(mDevice->UpdateSize, 8192));
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want.callback = &Sdl2Backend::audioCallbackC;
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want.userdata = this;
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/* Passing nullptr to SDL_OpenAudioDevice opens a default, which isn't
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* necessarily the first in the list.
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*/
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SDL_AudioDeviceID devid;
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if(!name || strcmp(name, defaultDeviceName) == 0)
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devid = SDL_OpenAudioDevice(nullptr, SDL_FALSE, &want, &have, SDL_AUDIO_ALLOW_ANY_CHANGE);
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else
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{
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const size_t prefix_len = strlen(DEVNAME_PREFIX);
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if(strncmp(name, DEVNAME_PREFIX, prefix_len) == 0)
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devid = SDL_OpenAudioDevice(name+prefix_len, SDL_FALSE, &want, &have,
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SDL_AUDIO_ALLOW_ANY_CHANGE);
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else
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devid = SDL_OpenAudioDevice(name, SDL_FALSE, &want, &have, SDL_AUDIO_ALLOW_ANY_CHANGE);
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}
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if(!devid)
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throw al::backend_exception{al::backend_error::NoDevice, "%s", SDL_GetError()};
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DevFmtChannels devchans{};
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if(have.channels >= 2)
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devchans = DevFmtStereo;
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else if(have.channels == 1)
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devchans = DevFmtMono;
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else
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{
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SDL_CloseAudioDevice(devid);
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throw al::backend_exception{al::backend_error::DeviceError,
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"Unhandled SDL channel count: %d", int{have.channels}};
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}
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DevFmtType devtype{};
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switch(have.format)
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{
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case AUDIO_U8: devtype = DevFmtUByte; break;
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case AUDIO_S8: devtype = DevFmtByte; break;
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case AUDIO_U16SYS: devtype = DevFmtUShort; break;
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case AUDIO_S16SYS: devtype = DevFmtShort; break;
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case AUDIO_S32SYS: devtype = DevFmtInt; break;
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case AUDIO_F32SYS: devtype = DevFmtFloat; break;
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default:
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SDL_CloseAudioDevice(devid);
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throw al::backend_exception{al::backend_error::DeviceError, "Unhandled SDL format: 0x%04x",
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have.format};
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}
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if(mDeviceID)
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SDL_CloseAudioDevice(mDeviceID);
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mDeviceID = devid;
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mFrameSize = BytesFromDevFmt(devtype) * have.channels;
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mFrequency = static_cast<uint>(have.freq);
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mFmtChans = devchans;
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mFmtType = devtype;
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mUpdateSize = have.samples;
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mDevice->DeviceName = name ? name : defaultDeviceName;
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}
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bool Sdl2Backend::reset()
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{
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mDevice->Frequency = mFrequency;
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mDevice->FmtChans = mFmtChans;
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mDevice->FmtType = mFmtType;
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mDevice->UpdateSize = mUpdateSize;
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mDevice->BufferSize = mUpdateSize * 2; /* SDL always (tries to) use two periods. */
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setDefaultWFXChannelOrder();
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return true;
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}
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void Sdl2Backend::start()
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{ SDL_PauseAudioDevice(mDeviceID, 0); }
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void Sdl2Backend::stop()
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{ SDL_PauseAudioDevice(mDeviceID, 1); }
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} // namespace
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BackendFactory &SDL2BackendFactory::getFactory()
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{
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static SDL2BackendFactory factory{};
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return factory;
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}
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bool SDL2BackendFactory::init()
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{ return (SDL_InitSubSystem(SDL_INIT_AUDIO) == 0); }
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bool SDL2BackendFactory::querySupport(BackendType type)
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{ return type == BackendType::Playback; }
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std::string SDL2BackendFactory::probe(BackendType type)
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{
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std::string outnames;
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if(type != BackendType::Playback)
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return outnames;
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int num_devices{SDL_GetNumAudioDevices(SDL_FALSE)};
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/* Includes null char. */
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outnames.append(defaultDeviceName, sizeof(defaultDeviceName));
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for(int i{0};i < num_devices;++i)
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{
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std::string name{DEVNAME_PREFIX};
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name += SDL_GetAudioDeviceName(i, SDL_FALSE);
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if(!name.empty())
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outnames.append(name.c_str(), name.length()+1);
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}
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return outnames;
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}
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BackendPtr SDL2BackendFactory::createBackend(DeviceBase *device, BackendType type)
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{
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if(type == BackendType::Playback)
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return BackendPtr{new Sdl2Backend{device}};
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return nullptr;
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}
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