Alc/backends/loopback.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 2011 by Chris Robinson
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24
  25 #include "alMain.h"
  26 #include "alu.h"
  27
  28 #include "backends/base.h"
  29
  30
  31 typedef struct ALCloopback {
  32     DERIVE_FROM_TYPE(ALCbackend);
  33 } ALCloopback;
  34
  35 static void ALCloopback_Construct(ALCloopback *self, ALCdevice *device);
  36 static DECLARE_FORWARD(ALCloopback, ALCbackend, void, Destruct)
  37 static ALCenum ALCloopback_open(ALCloopback *self, const ALCchar *name);
  38 static void ALCloopback_close(ALCloopback *self);
  39 static ALCboolean ALCloopback_reset(ALCloopback *self);
  40 static ALCboolean ALCloopback_start(ALCloopback *self);
  41 static void ALCloopback_stop(ALCloopback *self);
  42 static DECLARE_FORWARD2(ALCloopback, ALCbackend, ALCenum, captureSamples, void*, ALCuint)
  43 static DECLARE_FORWARD(ALCloopback, ALCbackend, ALCuint, availableSamples)
  44 static DECLARE_FORWARD(ALCloopback, ALCbackend, ALint64, getLatency)
  45 static DECLARE_FORWARD(ALCloopback, ALCbackend, void, lock)
  46 static DECLARE_FORWARD(ALCloopback, ALCbackend, void, unlock)
  47 DECLARE_DEFAULT_ALLOCATORS(ALCloopback)
  48 DEFINE_ALCBACKEND_VTABLE(ALCloopback);
  49
  50
  51 static void ALCloopback_Construct(ALCloopback *self, ALCdevice *device)
  52 {
  53     ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device);
  54     SET_VTABLE2(ALCloopback, ALCbackend, self);
  55 }
  56
  57
  58 static ALCenum ALCloopback_open(ALCloopback *self, const ALCchar *name)
  59 {
  60     ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice;
  61
  62     al_string_copy_cstr(&device->DeviceName, name);
  63     return ALC_NO_ERROR;
  64 }
  65
  66 static void ALCloopback_close(ALCloopback* UNUSED(self))
  67 {
  68 }
  69
  70 static ALCboolean ALCloopback_reset(ALCloopback *self)
  71 {
  72     SetDefaultWFXChannelOrder(STATIC_CAST(ALCbackend, self)->mDevice);
  73     return ALC_TRUE;
  74 }
  75
  76 static ALCboolean ALCloopback_start(ALCloopback* UNUSED(self))
  77 {
  78     return ALC_TRUE;
  79 }
  80
  81 static void ALCloopback_stop(ALCloopback* UNUSED(self))
  82 {
  83 }
  84
  85
  86 typedef struct ALCloopbackFactory {
  87     DERIVE_FROM_TYPE(ALCbackendFactory);
  88 } ALCloopbackFactory;
  89 #define ALCNULLBACKENDFACTORY_INITIALIZER { { GET_VTABLE2(ALCloopbackFactory, ALCbackendFactory) } }
  90
  91 ALCbackendFactory *ALCloopbackFactory_getFactory(void);
  92 static ALCboolean ALCloopbackFactory_init(ALCloopbackFactory *self);
  93 static DECLARE_FORWARD(ALCloopbackFactory, ALCbackendFactory, void, deinit)
  94 static ALCboolean ALCloopbackFactory_querySupport(ALCloopbackFactory *self, ALCbackend_Type type);
  95 static void ALCloopbackFactory_probe(ALCloopbackFactory *self, enum DevProbe type);
  96 static ALCbackend* ALCloopbackFactory_createBackend(ALCloopbackFactory *self, ALCdevice *device, ALCbackend_Type type);
  97 DEFINE_ALCBACKENDFACTORY_VTABLE(ALCloopbackFactory);
  98
  99
 100 ALCbackendFactory *ALCloopbackFactory_getFactory(void)
 101 {
 102     static ALCloopbackFactory factory = ALCNULLBACKENDFACTORY_INITIALIZER;
 103     return STATIC_CAST(ALCbackendFactory, &factory);
 104 }
 105
 106 static ALCboolean ALCloopbackFactory_init(ALCloopbackFactory* UNUSED(self))
 107 {
 108     return ALC_TRUE;
 109 }
 110
 111 static ALCboolean ALCloopbackFactory_querySupport(ALCloopbackFactory* UNUSED(self), ALCbackend_Type type)
 112 {
 113     if(type == ALCbackend_Loopback)
 114         return ALC_TRUE;
 115     return ALC_FALSE;
 116 }
 117
 118 static void ALCloopbackFactory_probe(ALCloopbackFactory* UNUSED(self), enum DevProbe UNUSED(type))
 119 {
 120 }
 121
 122 static ALCbackend* ALCloopbackFactory_createBackend(ALCloopbackFactory* UNUSED(self), ALCdevice *device, ALCbackend_Type type)
 123 {
 124     if(type == ALCbackend_Loopback)
 125     {
 126         ALCloopback *backend;
 127
 128         backend = ALCloopback_New(sizeof(*backend));
 129         if(!backend) return NULL;
 130         memset(backend, 0, sizeof(*backend));
 131
 132         ALCloopback_Construct(backend, device);
 133
 134         return STATIC_CAST(ALCbackend, backend);
 135     }
 136
 137     return NULL;
 138 }