mobile/audio: add android support

Due to licensing limitations, OpenAL should be dynamically loaded. Android apps that needs to import the audio package needs to be packed with libopenal.so as an extenal lib dependency. Instructions to build OpenAL for Android is available at http://repo.or.cz/w/openal-soft.git/blob/HEAD:/XCompile-Android.txt The packed libopenal.so is exported to /data/data/<package_name>/lib/libopenal.so at installation. The audio package dlopens libopenal.so from this location and dlsym to dispatch the OpenAL functions. Change-Id: I7aa36bb8dd0ae8e101ae4aa5366c3d426b2569a9 Reviewed-on: https://go-review.googlesource.com/6642 Reviewed-by: David Crawshaw <crawshaw@golang.org>
2025-02-23 06:48:15 +00:00 · 2015-03-03 10:34:19 -08:00 · 2015-03-03 10:34:19 -08:00 · c94142eb97
commit c94142eb97
parent 79fcbd2571
6 changed files with 519 additions and 4 deletions
--- a/audio/al/al.go
+++ b/audio/al/al.go
@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

-// +build darwin linux,!android
+// +build darwin linux

 // Package al provides OpenAL Soft bindings for Go.
 //
--- a/audio/al/al_android.go
+++ b/audio/al/al_android.go
@ -0,0 +1,447 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package al
+
+/*
+#cgo LDFLAGS: -llog
+
+#include <android/log.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <jni.h>
+#include <limits.h>
+#include <AL/al.h>
+#include <AL/alc.h>
+
+#define LOG_INFO(...) __android_log_print(ANDROID_LOG_INFO, "Go/OpenAL", __VA_ARGS__)
+#define LOG_FATAL(...) __android_log_print(ANDROID_LOG_FATAL, "Go/OpenAL", __VA_ARGS__)
+
+void* al_init(void* vm, void* context) {
+  JavaVM* current_vm = (JavaVM*)(vm);
+  JNIEnv* env;
+
+  int attached = 0;
+  switch ((*current_vm)->GetEnv(current_vm, (void**)&env, JNI_VERSION_1_6)) {
+  case JNI_OK:
+    break;
+  case JNI_EDETACHED:
+    if ((*current_vm)->AttachCurrentThread(current_vm, &env, 0) != 0) {
+      LOG_FATAL("cannot attach JVM");
+    }
+    attached = 1;
+    break;
+  case JNI_EVERSION:
+    LOG_FATAL("bad JNI version");
+  }
+
+  jclass android_content_Context = (*env)->FindClass(env, "android/content/Context");
+  jmethodID get_package_name = (*env)->GetMethodID(env, android_content_Context, "getPackageName", "()Ljava/lang/String;");
+  jstring package_name = (*env)->CallObjectMethod(env, context, get_package_name);
+  const char *cpackage_name = (*env)->GetStringUTFChars(env, package_name, 0);
+
+  char lib_path[PATH_MAX] = "/data/data/";
+  strcat(lib_path, cpackage_name);
+  strcat(lib_path, "/lib/libopenal.so");
+  void* handle = dlopen(lib_path, RTLD_LAZY);
+  (*env)->ReleaseStringUTFChars(env, package_name, cpackage_name);
+  if (!handle) {
+    LOG_FATAL("cannot load libopenal.so");
+  }
+  if (attached) {
+    (*current_vm)->DetachCurrentThread(current_vm);
+  }
+  return handle;
+}
+
+void call_alEnable(LPALENABLE fn, ALenum capability) {
+  fn(capability);
+}
+
+void call_alDisable(LPALDISABLE fn, ALenum capability) {
+  fn(capability);
+}
+
+ALboolean call_alIsEnabled(LPALISENABLED fn, ALenum capability) {
+  return fn(capability);
+}
+
+ALint call_alGetInteger(LPALGETINTEGER fn, ALenum p) {
+  return fn(p);
+}
+
+ALfloat call_alGetFloat(LPALGETFLOAT fn, ALenum p) {
+  return fn(p);
+}
+
+const char* call_alGetString(LPALGETSTRING fn, ALenum p) {
+  return fn(p);
+}
+
+void call_alDistanceModel(LPALDISTANCEMODEL fn, ALenum v) {
+  fn(v);
+}
+
+void call_alDopplerFactor(LPALDOPPLERFACTOR fn, ALfloat v) {
+  fn(v);
+}
+
+void call_alDopplerVelocity(LPALDOPPLERVELOCITY fn, ALfloat v) {
+  fn(v);
+}
+
+void call_alSpeedOfSound(LPALSPEEDOFSOUND fn, ALfloat v) {
+  fn(v);
+}
+
+ALint call_alGetError(LPALGETERROR fn) {
+  return fn();
+}
+
+void call_alGenSources(LPALGENSOURCES fn, ALsizei n, ALuint* s) {
+  fn(n, s);
+}
+
+void call_alSourcePlayv(LPALSOURCEPLAYV fn, ALsizei n, const ALuint* s) {
+  fn(n, s);
+}
+
+void call_alSourcePausev(LPALSOURCEPAUSEV fn, ALsizei n, const ALuint* s) {
+  fn(n, s);
+}
+
+void call_alSourceStopv(LPALSOURCESTOPV fn, ALsizei n, const ALuint* s) {
+  fn(n, s);
+}
+
+void call_alSourceRewindv(LPALSOURCEREWINDV fn, ALsizei n, const ALuint* s) {
+  fn(n, s);
+}
+
+void call_alDeleteSources(LPALDELETESOURCES fn, ALsizei n, const ALuint* s) {
+  fn(n, s);
+}
+
+void call_alGetSourcei(LPALGETSOURCEI fn, ALuint s, ALenum k, ALint* v) {
+  fn(s, k, v);
+}
+
+void call_alGetSourcef(LPALGETSOURCEF fn, ALuint s, ALenum k, ALfloat* v) {
+  fn(s, k, v);
+}
+
+void call_alGetSourcefv(LPALGETSOURCEFV fn, ALuint s, ALenum k, ALfloat* v) {
+  fn(s, k, v);
+}
+
+void call_alSourcei(LPALSOURCEI fn, ALuint s, ALenum k, ALint v) {
+  fn(s, k, v);
+}
+
+void call_alSourcef(LPALSOURCEF fn, ALuint s, ALenum k, ALfloat v) {
+  fn(s, k, v);
+}
+
+void call_alSourcefv(LPALSOURCEFV fn, ALuint s, ALenum k, const ALfloat* v) {
+  fn(s, k, v);
+}
+
+void call_alSourceQueueBuffers(LPALSOURCEQUEUEBUFFERS fn, ALuint s, ALsizei n, const ALuint* b) {
+  fn(s, n, b);
+}
+
+void call_alSourceUnqueueBuffers(LPALSOURCEUNQUEUEBUFFERS fn, ALuint s, ALsizei n, ALuint* b) {
+  fn(s, n, b);
+}
+
+void call_alGetListenerf(LPALGETLISTENERF fn, ALenum k, ALfloat* v) {
+  fn(k, v);
+}
+
+void call_alGetListenerfv(LPALLISTENERFV fn, ALenum k, ALfloat* v) {
+  fn(k, v);
+}
+
+void call_alListenerf(LPALLISTENERF fn, ALenum k, ALfloat v) {
+  fn(k, v);
+}
+
+void call_alListenerfv(LPALLISTENERFV fn, ALenum k, const ALfloat* v) {
+  fn(k, v);
+}
+
+void call_alGenBuffers(LPALGENBUFFERS fn, ALsizei n, ALuint* v) {
+  fn(n, v);
+}
+
+void call_alDeleteBuffers(LPALDELETEBUFFERS fn, ALsizei n, ALuint* v) {
+  fn(n, v);
+}
+
+void call_alGetBufferi(LPALGETBUFFERI fn, ALuint b, ALenum k, ALint* v) {
+  fn(b, k, v);
+}
+
+void call_alBufferData(LPALBUFFERDATA fn, ALuint b, ALenum format, const ALvoid* data, ALsizei size, ALsizei freq) {
+  fn(b, format, data, size, freq);
+}
+
+ALboolean call_alIsBuffer(LPALISBUFFER fn, ALuint b) {
+  return fn(b);
+}
+*/
+import "C"
+import "unsafe"
+
+import "golang.org/x/mobile/app"
+
+var (
+	alHandle                   unsafe.Pointer
+	alEnableFunc               C.LPALENABLE
+	alDisableFunc              C.LPALDISABLE
+	alIsEnabledFunc            C.LPALISENABLED
+	alGetIntegerFunc           C.LPALGETINTEGER
+	alGetFloatFunc             C.LPALGETFLOAT
+	alGetStringFunc            C.LPALGETSTRING
+	alDistanceModelFunc        C.LPALDISTANCEMODEL
+	alDopplerFactorFunc        C.LPALDOPPLERFACTOR
+	alDopplerVelocityFunc      C.LPALDOPPLERVELOCITY
+	alSpeedOfSoundFunc         C.LPALSPEEDOFSOUND
+	alGetErrorFunc             C.LPALGETERROR
+	alGenSourcesFunc           C.LPALGENSOURCES
+	alSourcePlayvFunc          C.LPALSOURCEPLAYV
+	alSourcePausevFunc         C.LPALSOURCEPAUSEV
+	alSourceStopvFunc          C.LPALSOURCESTOPV
+	alSourceRewindvFunc        C.LPALSOURCEREWINDV
+	alDeleteSourcesFunc        C.LPALDELETESOURCES
+	alGetSourceiFunc           C.LPALGETSOURCEI
+	alGetSourcefFunc           C.LPALGETSOURCEF
+	alGetSourcefvFunc          C.LPALGETSOURCEFV
+	alSourceiFunc              C.LPALSOURCEI
+	alSourcefFunc              C.LPALSOURCEF
+	alSourcefvFunc             C.LPALSOURCEFV
+	alSourceQueueBuffersFunc   C.LPALSOURCEQUEUEBUFFERS
+	alSourceUnqueueBuffersFunc C.LPALSOURCEUNQUEUEBUFFERS
+	alGetListenerfFunc         C.LPALGETLISTENERF
+	alGetListenerfvFunc        C.LPALGETLISTENERFV
+	alListenerfFunc            C.LPALLISTENERF
+	alListenerfvFunc           C.LPALLISTENERFV
+	alGenBuffersFunc           C.LPALGENBUFFERS
+	alDeleteBuffersFunc        C.LPALDELETEBUFFERS
+	alGetBufferiFunc           C.LPALGETBUFFERI
+	alBufferDataFunc           C.LPALBUFFERDATA
+	alIsBufferFunc             C.LPALISBUFFER
+
+	alcGetErrorFunc           C.LPALCGETERROR
+	alcOpenDeviceFunc         C.LPALCOPENDEVICE
+	alcCloseDeviceFunc        C.LPALCCLOSEDEVICE
+	alcCreateContextFunc      C.LPALCCREATECONTEXT
+	alcMakeContextCurrentFunc C.LPALCMAKECONTEXTCURRENT
+)
+
+func initAL() {
+	state := app.State.(interface {
+		JavaVM() unsafe.Pointer
+		AndroidContext() unsafe.Pointer
+	})
+
+	alHandle = C.al_init(state.JavaVM(), state.AndroidContext())
+	alEnableFunc = C.LPALENABLE(fn("alEnable"))
+	alDisableFunc = C.LPALDISABLE(fn("alDisable"))
+	alIsEnabledFunc = C.LPALISENABLED(fn("alIsEnabled"))
+	alGetIntegerFunc = C.LPALGETINTEGER(fn("alGetInteger"))
+	alGetFloatFunc = C.LPALGETFLOAT(fn("alGetFloat"))
+	alGetStringFunc = C.LPALGETSTRING(fn("alGetString"))
+	alDistanceModelFunc = C.LPALDISTANCEMODEL(fn("alDistanceModel"))
+	alDopplerFactorFunc = C.LPALDOPPLERFACTOR(fn("alDopplerFactor"))
+	alDopplerVelocityFunc = C.LPALDOPPLERVELOCITY(fn("alDopplerVelocity"))
+	alSpeedOfSoundFunc = C.LPALSPEEDOFSOUND(fn("alSpeedOfSound"))
+	alGetErrorFunc = C.LPALGETERROR(fn("alGetError"))
+	alGenSourcesFunc = C.LPALGENSOURCES(fn("alGenSources"))
+	alSourcePlayvFunc = C.LPALSOURCEPLAYV(fn("alSourcePlayv"))
+	alSourcePausevFunc = C.LPALSOURCEPAUSEV(fn("alSourcePausev"))
+	alSourceStopvFunc = C.LPALSOURCESTOPV(fn("alSourceStopv"))
+	alSourceRewindvFunc = C.LPALSOURCEREWINDV(fn("alSourceRewindv"))
+	alDeleteSourcesFunc = C.LPALDELETESOURCES(fn("alDeleteSources"))
+	alGetSourceiFunc = C.LPALGETSOURCEI(fn("alGetSourcei"))
+	alGetSourcefFunc = C.LPALGETSOURCEF(fn("alGetSourcef"))
+	alGetSourcefvFunc = C.LPALGETSOURCEFV(fn("alGetSourcefv"))
+	alSourceiFunc = C.LPALSOURCEI(fn("alSourcei"))
+	alSourcefFunc = C.LPALSOURCEF(fn("alSourcef"))
+	alSourcefvFunc = C.LPALSOURCEFV(fn("alSourcefv"))
+	alSourceQueueBuffersFunc = C.LPALSOURCEQUEUEBUFFERS(fn("alSourceQueueBuffers"))
+	alSourceUnqueueBuffersFunc = C.LPALSOURCEUNQUEUEBUFFERS(fn("alSourceUnqueueBuffers"))
+	alGetListenerfFunc = C.LPALGETLISTENERF(fn("alGetListenerf"))
+	alGetListenerfvFunc = C.LPALGETLISTENERFV(fn("alGetListenerfv"))
+	alListenerfFunc = C.LPALLISTENERF(fn("alListenerf"))
+	alListenerfvFunc = C.LPALLISTENERFV(fn("alListenerfv"))
+	alGenBuffersFunc = C.LPALGENBUFFERS(fn("alGenBuffers"))
+	alDeleteBuffersFunc = C.LPALDELETEBUFFERS(fn("alDeleteBuffers"))
+	alGetBufferiFunc = C.LPALGETBUFFERI(fn("alGetBufferi"))
+	alBufferDataFunc = C.LPALBUFFERDATA(fn("alBufferData"))
+	alIsBufferFunc = C.LPALISBUFFER(fn("alIsBuffer"))
+
+	alcGetErrorFunc = C.LPALCGETERROR(fn("alcGetError"))
+	alcOpenDeviceFunc = C.LPALCOPENDEVICE(fn("alcOpenDevice"))
+	alcCloseDeviceFunc = C.LPALCCLOSEDEVICE(fn("alcCloseDevice"))
+	alcCreateContextFunc = C.LPALCCREATECONTEXT(fn("alcCreateContext"))
+	alcMakeContextCurrentFunc = C.LPALCMAKECONTEXTCURRENT(fn("alcMakeContextCurrent"))
+}
+
+func fn(fname string) unsafe.Pointer {
+	name := C.CString(fname)
+	defer C.free(unsafe.Pointer(name))
+
+	// TODO(jbd): Handle dlsym error and panic.
+	return C.dlsym(alHandle, name)
+}
+
+func alEnable(capability int32) {
+	C.call_alEnable(alEnableFunc, C.ALenum(capability))
+}
+
+func alDisable(capability int32) {
+	C.call_alDisable(alDisableFunc, C.ALenum(capability))
+}
+
+func alIsEnabled(capability int32) bool {
+	return C.call_alIsEnabled(alIsEnabledFunc, C.ALenum(capability)) == 1
+}
+
+func alGetInteger(k int) int32 {
+	return int32(C.call_alGetInteger(alGetIntegerFunc, C.ALenum(k)))
+}
+
+func alGetFloat(k int) float32 {
+	return float32(C.call_alGetFloat(alGetFloatFunc, C.ALenum(k)))
+}
+
+func alGetString(v int) string {
+	value := C.call_alGetString(alGetStringFunc, C.ALenum(v))
+	return C.GoString(value)
+}
+
+func alDistanceModel(v int32) {
+	C.call_alDistanceModel(alDistanceModelFunc, C.ALenum(v))
+}
+
+func alDopplerFactor(v float32) {
+	C.call_alDopplerFactor(alDopplerFactorFunc, C.ALfloat(v))
+}
+
+func alDopplerVelocity(v float32) {
+	C.call_alDopplerVelocity(alDopplerVelocityFunc, C.ALfloat(v))
+}
+
+func alSpeedOfSound(v float32) {
+	C.call_alSpeedOfSound(alSpeedOfSoundFunc, C.ALfloat(v))
+}
+
+func alGetError() int32 {
+	return int32(C.call_alGetError(alGetErrorFunc))
+}
+
+func alGenSources(n int) []Source {
+	s := make([]Source, n)
+	C.call_alGenSources(alGenSourcesFunc, C.ALsizei(n), (*C.ALuint)(unsafe.Pointer(&s[0])))
+	return s
+}
+
+func alSourcePlayv(s []Source) {
+	C.call_alSourcePlayv(alSourcePlayvFunc, C.ALsizei(len(s)), (*C.ALuint)(unsafe.Pointer(&s[0])))
+}
+
+func alSourcePausev(s []Source) {
+	C.call_alSourcePausev(alSourcePausevFunc, C.ALsizei(len(s)), (*C.ALuint)(unsafe.Pointer(&s[0])))
+}
+
+func alSourceStopv(s []Source) {
+	C.call_alSourceStopv(alSourceStopvFunc, C.ALsizei(len(s)), (*C.ALuint)(unsafe.Pointer(&s[0])))
+}
+
+func alSourceRewindv(s []Source) {
+	C.call_alSourceRewindv(alSourceRewindvFunc, C.ALsizei(len(s)), (*C.ALuint)(unsafe.Pointer(&s[0])))
+}
+
+func alDeleteSources(s []Source) {
+	C.call_alDeleteSources(alDeleteSourcesFunc, C.ALsizei(len(s)), (*C.ALuint)(unsafe.Pointer(&s[0])))
+}
+
+func alGetSourcei(s Source, k int) int32 {
+	var v C.ALint
+	C.call_alGetSourcei(alGetSourceiFunc, C.ALuint(s), C.ALenum(k), &v)
+	return int32(v)
+}
+
+func alGetSourcef(s Source, k int) float32 {
+	var v C.ALfloat
+	C.call_alGetSourcef(alGetSourcefFunc, C.ALuint(s), C.ALenum(k), &v)
+	return float32(v)
+}
+
+func alGetSourcefv(s Source, k int, v []float32) {
+	C.call_alGetSourcefv(alGetSourcefvFunc, C.ALuint(s), C.ALenum(k), (*C.ALfloat)(unsafe.Pointer(&v[0])))
+}
+
+func alSourcei(s Source, k int, v int32) {
+	C.call_alSourcei(alSourcefFunc, C.ALuint(s), C.ALenum(k), C.ALint(v))
+}
+
+func alSourcef(s Source, k int, v float32) {
+	C.call_alSourcef(alSourcefFunc, C.ALuint(s), C.ALenum(k), C.ALfloat(v))
+}
+
+func alSourcefv(s Source, k int, v []float32) {
+	C.call_alSourcefv(alSourcefvFunc, C.ALuint(s), C.ALenum(k), (*C.ALfloat)(unsafe.Pointer(&v[0])))
+}
+
+func alSourceQueueBuffers(s Source, b []Buffer) {
+	C.call_alSourceQueueBuffers(alSourceQueueBuffersFunc, C.ALuint(s), C.ALsizei(len(b)), (*C.ALuint)(unsafe.Pointer(&b[0])))
+}
+
+func alSourceUnqueueBuffers(s Source, b []Buffer) {
+	C.call_alSourceUnqueueBuffers(alSourceUnqueueBuffersFunc, C.ALuint(s), C.ALsizei(len(b)), (*C.ALuint)(unsafe.Pointer(&b[0])))
+}
+
+func alGetListenerf(k int) float32 {
+	var v C.ALfloat
+	C.call_alGetListenerf(alListenerfFunc, C.ALenum(k), &v)
+	return float32(v)
+}
+
+func alGetListenerfv(k int, v []float32) {
+	C.call_alGetListenerfv(alGetListenerfvFunc, C.ALenum(k), (*C.ALfloat)(unsafe.Pointer(&v[0])))
+}
+
+func alListenerf(k int, v float32) {
+	C.call_alListenerf(alListenerfFunc, C.ALenum(k), C.ALfloat(v))
+}
+
+func alListenerfv(k int, v []float32) {
+	C.call_alListenerfv(alListenerfvFunc, C.ALenum(k), (*C.ALfloat)(unsafe.Pointer(&v[0])))
+}
+
+func alGenBuffers(n int) []Buffer {
+	s := make([]Buffer, n)
+	C.call_alGenBuffers(alGenBuffersFunc, C.ALsizei(n), (*C.ALuint)(unsafe.Pointer(&s[0])))
+	return s
+}
+
+func alDeleteBuffers(b []Buffer) {
+	C.call_alDeleteBuffers(alDeleteBuffersFunc, C.ALsizei(len(b)), (*C.ALuint)(unsafe.Pointer(&b[0])))
+}
+
+func alGetBufferi(b Buffer, k int) int32 {
+	var v C.ALint
+	C.call_alGetBufferi(alGetBufferiFunc, C.ALuint(b), C.ALenum(k), &v)
+	return int32(v)
+}
+
+func alBufferData(b Buffer, format uint32, data []byte, freq int32) {
+	C.call_alBufferData(alBufferDataFunc, C.ALuint(b), C.ALenum(format), unsafe.Pointer(&data[0]), C.ALsizei(len(data)), C.ALsizei(freq))
+}
+
+func alIsBuffer(b Buffer) bool {
+	return C.call_alIsBuffer(alIsBufferFunc, C.ALuint(b)) == 1
+}
--- a/audio/al/alc.go
+++ b/audio/al/alc.go
@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

-// +build darwin linux,!android
+// +build darwin linux

 package al

--- a/audio/al/alc_android.go
+++ b/audio/al/alc_android.go
@ -0,0 +1,68 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package al
+
+/*
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <AL/al.h>
+#include <AL/alc.h>
+
+ALCint call_alcGetError(LPALCGETERROR fn, ALCdevice* d) {
+  return fn(d);
+}
+
+ALCdevice* call_alcOpenDevice(LPALCOPENDEVICE fn, const ALCchar* name) {
+  return fn(name);
+}
+
+ALCboolean call_alcCloseDevice(LPALCCLOSEDEVICE fn, ALCdevice* d) {
+  return fn(d);
+}
+
+ALCcontext* call_alcCreateContext(LPALCCREATECONTEXT fn, ALCdevice* d, const ALCint* attrs) {
+  return fn(d, attrs);
+}
+
+ALCboolean call_alcMakeContextCurrent(LPALCMAKECONTEXTCURRENT fn, ALCcontext* c) {
+  return fn(c);
+}
+*/
+import "C"
+import (
+	"sync"
+	"unsafe"
+)
+
+var once sync.Once
+
+func alcGetError(d unsafe.Pointer) int32 {
+	dev := (*C.ALCdevice)(d)
+	return int32(C.call_alcGetError(alcGetErrorFunc, dev))
+}
+
+func alcOpenDevice(name string) unsafe.Pointer {
+	once.Do(initAL)
+	n := C.CString(name)
+	defer C.free(unsafe.Pointer(n))
+
+	return (unsafe.Pointer)(C.call_alcOpenDevice(alcOpenDeviceFunc, (*C.ALCchar)(unsafe.Pointer(n))))
+}
+
+func alcCloseDevice(d unsafe.Pointer) bool {
+	dev := (*C.ALCdevice)(d)
+	return C.call_alcCloseDevice(alcCloseDeviceFunc, dev) == 1
+}
+
+func alcCreateContext(d unsafe.Pointer, attrs []int32) unsafe.Pointer {
+	dev := (*C.ALCdevice)(d)
+	// TODO(jbd): Handle attrs.
+	return (unsafe.Pointer)(C.call_alcCreateContext(alcCreateContextFunc, dev, nil))
+}
+
+func alcMakeContextCurrent(c unsafe.Pointer) bool {
+	ctx := (*C.ALCcontext)(c)
+	return C.call_alcMakeContextCurrent(alcMakeContextCurrentFunc, ctx) == 1
+}
--- a/audio/al/const.go
+++ b/audio/al/const.go
@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

-// +build darwin linux,!android
+// +build darwin linux

 package al

--- a/audio/audio.go
+++ b/audio/audio.go
@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

-// +build darwin linux,!android
+// +build darwin linux

 // Package audio provides a basic audio player.
 package audio