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Merge pull request #175 from jhasse/sdl2-backend

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Add SDL2 backend for playback, fix #173
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kcat 2018-03-08 17:47:32 -08:00 committed by GitHub
commit 5133fe5115
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5 changed files with 266 additions and 1 deletions
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3
Alc/ALc.c
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@ -100,6 +100,9 @@ static struct BackendInfo BackendList[] = {
#ifdef HAVE_OPENSL
{ "opensl", ALCopenslBackendFactory_getFactory },
#endif
#ifdef HAVE_SDL2
{ "sdl2", ALCsdl2BackendFactory_getFactory },
#endif
{ "null", ALCnullBackendFactory_getFactory },
#ifdef HAVE_WAVE

1
Alc/backends/base.h
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@ -147,6 +147,7 @@ ALCbackendFactory *ALCportBackendFactory_getFactory(void);
ALCbackendFactory *ALCopenslBackendFactory_getFactory(void);
ALCbackendFactory *ALCnullBackendFactory_getFactory(void);
ALCbackendFactory *ALCwaveBackendFactory_getFactory(void);
ALCbackendFactory *ALCsdl2BackendFactory_getFactory(void);
ALCbackendFactory *ALCloopbackFactory_getFactory(void);

238
Alc/backends/sdl2.c Normal file
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@ -0,0 +1,238 @@
/**
* 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 "alMain.h"
#include "alu.h"
#include "threads.h"
#include "compat.h"
#include "backends/base.h"
typedef struct ALCsdl2Backend {
DERIVE_FROM_TYPE(ALCbackend);
SDL_AudioDeviceID deviceID;
ALCboolean quit;
ALuint Frequency;
enum DevFmtChannels FmtChans;
enum DevFmtType FmtType;
} ALCsdl2Backend;
static void ALCsdl2Backend_Construct(ALCsdl2Backend *self, ALCdevice *device);
static DECLARE_FORWARD(ALCsdl2Backend, ALCbackend, void, Destruct)
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 DECLARE_FORWARD(ALCsdl2Backend, ALCbackend, void, lock)
static DECLARE_FORWARD(ALCsdl2Backend, ALCbackend, void, unlock)
DECLARE_DEFAULT_ALLOCATORS(ALCsdl2Backend)
DEFINE_ALCBACKEND_VTABLE(ALCsdl2Backend);
static const ALCchar defaultDeviceName[] = "Default device";
static void ALCsdl2Backend_Construct(ALCsdl2Backend *self, ALCdevice *device)
{
ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device);
SET_VTABLE2(ALCsdl2Backend, ALCbackend, self);
self->quit = ALC_FALSE;
self->Frequency = device->Frequency;
self->FmtChans = device->FmtChans;
self->FmtType = device->FmtType;
if(SDL_WasInit(0) == 0) // Is SDL2 initialized at all?
{
SDL_Init(SDL_INIT_AUDIO);
self->quit = ALC_TRUE;
}
else if(!SDL_WasInit(SDL_INIT_AUDIO))
SDL_InitSubSystem(SDL_INIT_AUDIO);
}
static void ALCsdl2Backend_audioCallback(void *ptr, Uint8* stream, int len)
{
ALCsdl2Backend *self = (ALCsdl2Backend*)ptr;
ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice;
ALsizei frameSize = FrameSizeFromDevFmt(
device->FmtChans, device->FmtType, device->AmbiOrder
);
assert(len % frameSize == 0);
ALCsdl2Backend_lock(self);
aluMixData(device, stream, len / frameSize);
ALCsdl2Backend_unlock(self);
}
static ALCenum ALCsdl2Backend_open(ALCsdl2Backend *self, const ALCchar *name)
{
ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice;
SDL_AudioSpec want, have;
SDL_zero(want);
want.freq = device->Frequency;
want.format = AUDIO_F32;
want.channels = (device->FmtChans == DevFmtMono) ? 1 : 2;
want.samples = device->UpdateSize;
want.callback = ALCsdl2Backend_audioCallback;
want.userdata = self;
if (name && strcmp(name, defaultDeviceName) == 0)
name = NULL; // Passing NULL to SDL_OpenAudioDevice is special and will NOT select the first
// device in the list.
self->deviceID = SDL_OpenAudioDevice(name, 0, &want, &have, SDL_AUDIO_ALLOW_ANY_CHANGE);
if(self->deviceID == 0)
{
ERR("Could not open device\n");
return ALC_INVALID_VALUE;
}
if(want.freq != have.freq)
{
TRACE("Frequency changed by SDL2\n");
device->Frequency = have.freq;
}
if(have.channels == 1)
device->FmtChans = DevFmtMono;
else if(have.channels == 2)
device->FmtChans = DevFmtStereo;
else
{
ERR("Invalid number of channels\n");
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("Unsupported format\n");
return ALC_INVALID_VALUE;
}
self->Frequency = device->Frequency;
self->FmtChans = device->FmtChans;
self->FmtType = device->FmtType;
if(!name)
name = defaultDeviceName;
alstr_copy_cstr(&STATIC_CAST(ALCbackend, self)->mDevice->DeviceName, name);
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;
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);
if(self->quit)
SDL_Quit();
}
typedef struct ALCsdl2BackendFactory {
DERIVE_FROM_TYPE(ALCbackendFactory);
} ALCsdl2BackendFactory;
#define ALCsdl2BACKENDFACTORY_INITIALIZER { { GET_VTABLE2(ALCsdl2BackendFactory, ALCbackendFactory) } }
ALCbackendFactory *ALCsdl2BackendFactory_getFactory(void);
static ALCboolean ALCsdl2BackendFactory_init(ALCsdl2BackendFactory *self);
static DECLARE_FORWARD(ALCsdl2BackendFactory, ALCbackendFactory, void, deinit)
static ALCboolean ALCsdl2BackendFactory_querySupport(ALCsdl2BackendFactory *self, ALCbackend_Type type);
static void ALCsdl2BackendFactory_probe(ALCsdl2BackendFactory *self, enum DevProbe type);
static ALCbackend* ALCsdl2BackendFactory_createBackend(ALCsdl2BackendFactory *self, ALCdevice *device, ALCbackend_Type type);
DEFINE_ALCBACKENDFACTORY_VTABLE(ALCsdl2BackendFactory);
ALCbackendFactory *ALCsdl2BackendFactory_getFactory(void)
{
static ALCsdl2BackendFactory factory = ALCsdl2BACKENDFACTORY_INITIALIZER;
return STATIC_CAST(ALCbackendFactory, &factory);
}
static ALCboolean ALCsdl2BackendFactory_init(ALCsdl2BackendFactory* UNUSED(self))
{
return ALC_TRUE;
}
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)
{
if(type != ALL_DEVICE_PROBE)
return;
ALCboolean quit = ALC_FALSE;
if(SDL_WasInit(0) == 0) // Is SDL2 initialized at all?
{
SDL_Init(SDL_INIT_AUDIO);
quit = ALC_TRUE;
}
else if(!SDL_WasInit(SDL_INIT_AUDIO))
SDL_InitSubSystem(SDL_INIT_AUDIO);
AppendAllDevicesList(defaultDeviceName);
for(int i = 0; i < SDL_GetNumAudioDevices(0); ++i)
AppendAllDevicesList(SDL_GetAudioDeviceName(i, 0));
if(quit)
SDL_Quit();
}
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 NULL;
return STATIC_CAST(ALCbackend, backend);
}
return NULL;
}

20
CMakeLists.txt
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@ -759,6 +759,7 @@ SET(HAVE_PULSEAUDIO 0)
SET(HAVE_COREAUDIO 0)
SET(HAVE_OPENSL 0)
SET(HAVE_WAVE 0)
SET(HAVE_SDL2 0)
# Check for SSE support
OPTION(ALSOFT_REQUIRE_SSE "Require SSE support" OFF)
@ -1123,6 +1124,23 @@ IF(ALSOFT_REQUIRE_OPENSL AND NOT HAVE_OPENSL)
MESSAGE(FATAL_ERROR "Failed to enabled required OpenSL backend")
ENDIF()
# Check for SDL2 backend
OPTION(ALSOFT_REQUIRE_SDL2 "Require SDL2 backend" OFF)
FIND_PACKAGE(SDL2)
IF(SDL2_FOUND)
# Off by default, since it adds a runtime dependency
OPTION(ALSOFT_BACKEND_SDL2 "Enable SDL2 backend" OFF)
IF(ALSOFT_BACKEND_SDL2)
SET(HAVE_SDL2 1)
SET(ALC_OBJS ${ALC_OBJS} Alc/backends/sdl2.c)
SET(BACKENDS "${BACKENDS} SDL2,")
SET(EXTRA_LIBS ${SDL2_LIBRARY} ${EXTRA_LIBS})
ENDIF()
ENDIF()
IF(ALSOFT_REQUIRE_SDL2 AND NOT SDL2_FOUND)
MESSAGE(FATAL_ERROR "Failed to enabled required SDL2 backend")
ENDIF()
# Optionally enable the Wave Writer backend
OPTION(ALSOFT_BACKEND_WAVE "Enable Wave Writer backend" ON)
IF(ALSOFT_BACKEND_WAVE)
@ -1206,7 +1224,9 @@ IF(ALSOFT_UTILS AND NOT ALSOFT_NO_CONFIG_UTIL)
add_subdirectory(utils/alsoft-config)
ENDIF()
IF(ALSOFT_EXAMPLES)
IF(NOT SDL2_FOUND)
FIND_PACKAGE(SDL2)
ENDIF()
IF(SDL2_FOUND)
FIND_PACKAGE(SDL_sound)
FIND_PACKAGE(FFmpeg COMPONENTS AVFORMAT AVCODEC AVUTIL SWSCALE SWRESAMPLE)

3
config.h.in
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@ -77,6 +77,9 @@
/* Define if we have the Wave Writer backend */
#cmakedefine HAVE_WAVE
/* Define if we have the SDL2 backend */
#cmakedefine HAVE_SDL2
/* Define if we have the stat function */
#cmakedefine HAVE_STAT