Add a skeleton backend for JACK

5 files changed, 290 insertions, 0 deletions

diff --git a/Alc/ALc.c b/Alc/ALc.c
index 74b8e1ae..a680390f 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -82,6 +82,9 @@ static struct BackendInfo BackendList[] = {
 #ifdef HAVE_QSA
     { "qsa", NULL, alc_qsa_init, alc_qsa_deinit, alc_qsa_probe, EmptyFuncs },
 #endif
+#ifdef HAVE_JACK
+    { "jack", ALCjackBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
+#endif
 #ifdef HAVE_MMDEVAPI
     { "mmdevapi", ALCmmdevBackendFactory_getFactory, NULL, NULL, NULL, EmptyFuncs },
 #endif
diff --git a/Alc/backends/base.h b/Alc/backends/base.h
index 4ed3bfc9..1423268a 100644
--- a/Alc/backends/base.h
+++ b/Alc/backends/base.h
@@ -123,6 +123,7 @@ static const struct ALCbackendFactoryVtable T##_ALCbackendFactory_vtable = {  \
 ALCbackendFactory *ALCpulseBackendFactory_getFactory(void);
 ALCbackendFactory *ALCalsaBackendFactory_getFactory(void);
 ALCbackendFactory *ALCossBackendFactory_getFactory(void);
+ALCbackendFactory *ALCjackBackendFactory_getFactory(void);
 ALCbackendFactory *ALCmmdevBackendFactory_getFactory(void);
 ALCbackendFactory *ALCdsoundBackendFactory_getFactory(void);
 ALCbackendFactory *ALCwinmmBackendFactory_getFactory(void);
diff --git a/Alc/backends/jack.c b/Alc/backends/jack.c
new file mode 100644
index 00000000..bb7054fe
--- /dev/null
+++ b/Alc/backends/jack.c
@@ -0,0 +1,261 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 1999-2007 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 <stdio.h>
+#include <memory.h>
+
+#include "alMain.h"
+#include "alu.h"
+#include "threads.h"
+#include "compat.h"
+
+#include "backends/base.h"
+
+#include <jack/jack.h>
+#include <jack/ringbuffer.h>
+
+
+static const ALCchar jackDevice[] = "JACK Default";
+
+
+#ifdef HAVE_DYNLOAD
+#define JACK_FUNCS(MAGIC)         \
+    MAGIC(jack_client_open);      \
+    MAGIC(jack_client_close);     \
+    MAGIC(jack_client_name_size); \
+    MAGIC(jack_get_client_name);
+
+static void *jack_handle;
+#define MAKE_FUNC(f) static __typeof(f) * p##f
+JACK_FUNCS(MAKE_FUNC);
+#undef MAKE_FUNC
+
+#define jack_client_open pjack_client_open
+#define jack_client_close pjack_client_close
+#define jack_client_name_size pjack_client_name_size
+#define jack_get_client_name pjack_get_client_name
+#endif
+
+
+static ALCboolean jack_load(void)
+{
+    ALCboolean error = ALC_FALSE;
+
+#ifdef HAVE_DYNLOAD
+    if(!jack_handle)
+    {
+        jack_handle = LoadLib("libjack.so.0");
+        if(!jack_handle)
+            return ALC_FALSE;
+
+        error = ALC_FALSE;
+#define LOAD_FUNC(f) do {                                                     \
+    p##f = GetSymbol(jack_handle, #f);                                        \
+    if(p##f == NULL) {                                                        \
+        error = ALC_TRUE;                                                     \
+    }                                                                         \
+} while(0)
+        JACK_FUNCS(LOAD_FUNC);
+#undef LOAD_FUNC
+
+        if(error)
+        {
+            CloseLib(jack_handle);
+            jack_handle = NULL;
+            return ALC_FALSE;
+        }
+    }
+#endif
+
+    return !error;
+}
+
+
+typedef struct ALCjackPlayback {
+    DERIVE_FROM_TYPE(ALCbackend);
+
+    jack_client_t *Client;
+
+    volatile int killNow;
+    althrd_t thread;
+} ALCjackPlayback;
+
+static void ALCjackPlayback_Construct(ALCjackPlayback *self, ALCdevice *device);
+static void ALCjackPlayback_Destruct(ALCjackPlayback *self);
+static ALCenum ALCjackPlayback_open(ALCjackPlayback *self, const ALCchar *name);
+static void ALCjackPlayback_close(ALCjackPlayback *self);
+static ALCboolean ALCjackPlayback_reset(ALCjackPlayback *self);
+static ALCboolean ALCjackPlayback_start(ALCjackPlayback *self);
+static void ALCjackPlayback_stop(ALCjackPlayback *self);
+static DECLARE_FORWARD2(ALCjackPlayback, ALCbackend, ALCenum, captureSamples, void*, ALCuint)
+static DECLARE_FORWARD(ALCjackPlayback, ALCbackend, ALCuint, availableSamples)
+static DECLARE_FORWARD(ALCjackPlayback, ALCbackend, ALint64, getLatency)
+static DECLARE_FORWARD(ALCjackPlayback, ALCbackend, void, lock)
+static DECLARE_FORWARD(ALCjackPlayback, ALCbackend, void, unlock)
+DECLARE_DEFAULT_ALLOCATORS(ALCjackPlayback)
+
+DEFINE_ALCBACKEND_VTABLE(ALCjackPlayback);
+
+
+static void ALCjackPlayback_Construct(ALCjackPlayback *self, ALCdevice *device)
+{
+    ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device);
+    SET_VTABLE2(ALCjackPlayback, ALCbackend, self);
+
+    self->Client = NULL;
+    self->killNow = 1;
+}
+
+static void ALCjackPlayback_Destruct(ALCjackPlayback *self)
+{
+    if(self->Client)
+        jack_client_close(self->Client);
+    self->Client = NULL;
+
+    ALCbackend_Destruct(STATIC_CAST(ALCbackend, self));
+}
+
+
+static ALCenum ALCjackPlayback_open(ALCjackPlayback *self, const ALCchar *name)
+{
+    ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice;
+
+    if(!name)
+        name = jackDevice;
+    else if(strcmp(name, jackDevice) != 0)
+        return ALC_INVALID_VALUE;
+
+
+    al_string_copy_cstr(&device->DeviceName, name);
+
+    return ALC_INVALID_VALUE;
+}
+
+static void ALCjackPlayback_close(ALCjackPlayback *UNUSED(self))
+{
+}
+
+static ALCboolean ALCjackPlayback_reset(ALCjackPlayback *UNUSED(self))
+{
+    //jack_set_process_callback (client, process, &data);
+    return ALC_FALSE;
+}
+
+static ALCboolean ALCjackPlayback_start(ALCjackPlayback *UNUSED(self))
+{
+    return ALC_FALSE;
+}
+
+static void ALCjackPlayback_stop(ALCjackPlayback *self)
+{
+    int res;
+
+    if(self->killNow)
+        return;
+
+    self->killNow = 1;
+    althrd_join(self->thread, &res);
+}
+
+
+typedef struct ALCjackBackendFactory {
+    DERIVE_FROM_TYPE(ALCbackendFactory);
+} ALCjackBackendFactory;
+#define ALCJACKBACKENDFACTORY_INITIALIZER { { GET_VTABLE2(ALCjackBackendFactory, ALCbackendFactory) } }
+
+static ALCboolean ALCjackBackendFactory_init(ALCjackBackendFactory* UNUSED(self))
+{
+    jack_client_t *client;
+    jack_status_t status;
+
+    if(!jack_load())
+        return ALC_FALSE;
+
+    client = jack_client_open("alsoft", 0, &status, NULL);
+    if(client == NULL)
+    {
+        WARN("jack_client_open() failed, 0x%02x\n", status);
+        if((status&JackServerFailed))
+            ERR("Unable to connect to JACK server\n");
+        return ALC_FALSE;
+    }
+
+    jack_client_close(client);
+    return ALC_TRUE;
+}
+
+static void ALCjackBackendFactory_deinit(ALCjackBackendFactory* UNUSED(self))
+{
+#ifdef HAVE_DYNLOAD
+    if(jack_handle)
+        CloseLib(jack_handle);
+    jack_handle = NULL;
+#endif
+}
+
+static ALCboolean ALCjackBackendFactory_querySupport(ALCjackBackendFactory* UNUSED(self), ALCbackend_Type type)
+{
+    if(type == ALCbackend_Playback)
+        return ALC_TRUE;
+    return ALC_FALSE;
+}
+
+static void ALCjackBackendFactory_probe(ALCjackBackendFactory* UNUSED(self), enum DevProbe type)
+{
+    switch(type)
+    {
+        case ALL_DEVICE_PROBE:
+            AppendAllDevicesList(jackDevice);
+            break;
+
+        case CAPTURE_DEVICE_PROBE:
+            break;
+    }
+}
+
+static ALCbackend* ALCjackBackendFactory_createBackend(ALCjackBackendFactory* UNUSED(self), ALCdevice *device, ALCbackend_Type type)
+{
+    if(type == ALCbackend_Playback)
+    {
+        ALCjackPlayback *backend;
+
+        backend = ALCjackPlayback_New(sizeof(*backend));
+        if(!backend) return NULL;
+        memset(backend, 0, sizeof(*backend));
+
+        ALCjackPlayback_Construct(backend, device);
+
+        return STATIC_CAST(ALCbackend, backend);
+    }
+
+    return NULL;
+}
+
+DEFINE_ALCBACKENDFACTORY_VTABLE(ALCjackBackendFactory);
+
+
+ALCbackendFactory *ALCjackBackendFactory_getFactory(void)
+{
+    static ALCjackBackendFactory factory = ALCJACKBACKENDFACTORY_INITIALIZER;
+    return STATIC_CAST(ALCbackendFactory, &factory);
+}
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c4d4286c..80bcadb8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -913,6 +913,25 @@ IF(ALSOFT_REQUIRE_PULSEAUDIO AND NOT HAVE_PULSEAUDIO)
     MESSAGE(FATAL_ERROR "Failed to enabled required PulseAudio backend")
 ENDIF()
 
+# Check JACK backend
+OPTION(ALSOFT_REQUIRE_JACK "Require JACK backend" OFF)
+FIND_PACKAGE(JACK)
+IF(JACK_FOUND)
+    OPTION(ALSOFT_BACKEND_JACK "Enable JACK backend" ON)
+    IF(ALSOFT_BACKEND_JACK)
+        SET(HAVE_JACK 1)
+        SET(BACKENDS  "${BACKENDS} JACK${IS_LINKED},")
+        SET(ALC_OBJS  ${ALC_OBJS} Alc/backends/jack.c)
+        ADD_BACKEND_LIBS(${PULSEAUDIO_LIBRARIES})
+        IF(CMAKE_VERSION VERSION_LESS "2.8.8")
+            INCLUDE_DIRECTORIES(${JACK_INCLUDE_DIRS})
+        ENDIF()
+    ENDIF()
+ENDIF()
+IF(ALSOFT_REQUIRE_JACK AND NOT HAVE_JACK)
+    MESSAGE(FATAL_ERROR "Failed to enabled required JACK backend")
+ENDIF()
+
 # Check CoreAudio backend
 OPTION(ALSOFT_REQUIRE_COREAUDIO "Require CoreAudio backend" OFF)
 FIND_LIBRARY(COREAUDIO_FRAMEWORK
@@ -1059,6 +1078,9 @@ ENDIF()
 IF(HAVE_PULSEAUDIO)
     SET_PROPERTY(TARGET ${LIBNAME} APPEND PROPERTY INCLUDE_DIRECTORIES ${PULSEAUDIO_INCLUDE_DIRS})
 ENDIF()
+IF(HAVE_JACK)
+    SET_PROPERTY(TARGET ${LIBNAME} APPEND PROPERTY INCLUDE_DIRECTORIES ${JACK_INCLUDE_DIRS})
+ENDIF()
 SET_TARGET_PROPERTIES(${LIBNAME} PROPERTIES VERSION ${LIB_VERSION}
                                             SOVERSION ${LIB_MAJOR_VERSION})
 IF(WIN32 AND NOT LIBTYPE STREQUAL "STATIC")
diff --git a/config.h.in b/config.h.in
index af0d8bfd..f999eb49 100644
--- a/config.h.in
+++ b/config.h.in
@@ -64,6 +64,9 @@
 /* Define if we have the PulseAudio backend */
 #cmakedefine HAVE_PULSEAUDIO
 
+/* Define if we have the JACK backend */
+#cmakedefine HAVE_JACK
+
 /* Define if we have the CoreAudio backend */
 #cmakedefine HAVE_COREAUDIO