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https://github.com/hajimehoshi/ebiten.git
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audio/internal/driver: Add driver_android.go (WIP)
This commit is contained in:
Hajime Hoshi
parent
64afa87def
commit
b65aeb7ac3
187
audio/internal/driver/driver_android.go
Normal file
187
audio/internal/driver/driver_android.go
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@ -0,0 +1,187 @@
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// Copyright 2016 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package driver
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/*
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#cgo LDFLAGS: -llog
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#include <android/log.h>
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#include <jni.h>
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#include <stdlib.h>
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// __android_log_print(ANDROID_LOG_ERROR, "NativeCode", "foo", "bar");
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static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject context,
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int sampleRate, int channelNum, int bytesPerSample, jobject* audioTrack) {
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JavaVM* vm = (JavaVM*)java_vm;
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JNIEnv* env = (JNIEnv*)jni_env;
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const jclass android_media_AudioFormat =
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(*env)->FindClass(env, "android/media/AudioFormat");
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const jclass android_media_AudioManager =
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(*env)->FindClass(env, "android/media/AudioManager");
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const jclass android_media_AudioTrack =
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(*env)->FindClass(env, "android/media/AudioTrack");
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const jint android_media_AudioManager_STREAM_MUSIC =
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(*env)->GetStaticIntField(
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env, android_media_AudioManager,
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(*env)->GetStaticFieldID(env, android_media_AudioManager, "STREAM_MUSIC", "I"));
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const jint android_media_AudioTrack_MODE_STREAM =
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(*env)->GetStaticIntField(
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env, android_media_AudioTrack,
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(*env)->GetStaticFieldID(env, android_media_AudioTrack, "MODE_STREAM", "I"));
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const jint android_media_AudioFormat_CHANNEL_OUT_MONO =
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(*env)->GetStaticIntField(
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env, android_media_AudioFormat,
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(*env)->GetStaticFieldID(env, android_media_AudioFormat, "CHANNEL_OUT_MONO", "I"));
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const jint android_media_AudioFormat_CHANNEL_OUT_STEREO =
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(*env)->GetStaticIntField(
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env, android_media_AudioFormat,
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(*env)->GetStaticFieldID(env, android_media_AudioFormat, "CHANNEL_OUT_STEREO", "I"));
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const jint android_media_AudioFormat_ENCODING_PCM_8BIT =
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(*env)->GetStaticIntField(
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env, android_media_AudioFormat,
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(*env)->GetStaticFieldID(env, android_media_AudioFormat, "ENCODING_PCM_8BIT", "I"));
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const jint android_media_AudioFormat_ENCODING_PCM_16BIT =
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(*env)->GetStaticIntField(
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env, android_media_AudioFormat,
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(*env)->GetStaticFieldID(env, android_media_AudioFormat, "ENCODING_PCM_16BIT", "I"));
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jint channel = android_media_AudioFormat_CHANNEL_OUT_MONO;
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switch (channelNum) {
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case 1:
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channel = android_media_AudioFormat_CHANNEL_OUT_MONO;
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break;
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case 2:
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channel = android_media_AudioFormat_CHANNEL_OUT_STEREO;
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break;
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default:
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return "invalid channel";
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}
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jint encoding = android_media_AudioFormat_ENCODING_PCM_8BIT;
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switch (bytesPerSample) {
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case 1:
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channel = android_media_AudioFormat_ENCODING_PCM_8BIT;
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break;
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case 2:
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channel = android_media_AudioFormat_ENCODING_PCM_16BIT;
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break;
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default:
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return "invalid bytesPerSample";
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}
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const jint bufferSize =
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(*env)->CallStaticIntMethod(
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env, android_media_AudioTrack,
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(*env)->GetStaticMethodID(env, android_media_AudioTrack, "getMinBufferSize", "(III)I"),
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sampleRate, channel, encoding);
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const jobject tmpAudioTrack =
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(*env)->NewObject(
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env, android_media_AudioTrack,
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(*env)->GetMethodID(env, android_media_AudioTrack, "<init>", "(IIIIII)V"),
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android_media_AudioManager_STREAM_MUSIC,
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sampleRate, channel, encoding, bufferSize,
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android_media_AudioTrack_MODE_STREAM);
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// Note that *audioTrack will never be released.
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*audioTrack = (*env)->NewGlobalRef(env, tmpAudioTrack);
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(*env)->CallVoidMethod(
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env, *audioTrack,
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(*env)->GetMethodID(env, android_media_AudioTrack, "play", "()V"));
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return NULL;
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}
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static char* writeToAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject context,
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jobject audioTrack, void* data, int length) {
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// TODO: audioTrack object is not valid here?
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JavaVM* vm = (JavaVM*)java_vm;
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JNIEnv* env = (JNIEnv*)jni_env;
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const jclass android_media_AudioTrack =
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(*env)->FindClass(env, "android/media/AudioTrack");
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const jint android_media_AudioTrack_WRITE_NON_BLOCKING =
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(*env)->GetStaticIntField(
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env, android_media_AudioTrack,
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(*env)->GetStaticFieldID(env, android_media_AudioTrack, "WRITE_NON_BLOCKING", "I"));
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jbyteArray arr = (*env)->NewByteArray(env, length);
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(*env)->SetByteArrayRegion(env, arr, 0, length, data);
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jint result =
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(*env)->CallIntMethod(
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env, audioTrack,
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(*env)->GetMethodID(env, android_media_AudioTrack, "write", "([BIII)I"),
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arr, 0, length, android_media_AudioTrack_WRITE_NON_BLOCKING);
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// TODO: Check the result.
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return NULL;
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}
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*/
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import "C"
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import (
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"errors"
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"unsafe"
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)
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type Player struct {
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sampleRate int
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channelNum int
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bytesPerSample int
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audioTrack C.jobject
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}
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func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
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p := &Player{
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sampleRate: sampleRate,
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channelNum: channelNum,
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bytesPerSample: bytesPerSample,
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}
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if err := runOnJVM(func(vm, env, ctx uintptr) error {
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audioTrack := C.jobject(nil)
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if msg := C.initAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
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C.int(sampleRate), C.int(channelNum), C.int(bytesPerSample),
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&audioTrack); msg != nil {
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return errors.New(C.GoString(msg))
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}
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p.audioTrack = audioTrack
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return nil
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}); err != nil {
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return nil, err
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}
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return p, nil
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}
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func (p *Player) Proceed(data []byte) error {
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if err := runOnJVM(func(vm, env, ctx uintptr) error {
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if msg := C.writeToAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
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p.audioTrack, unsafe.Pointer(&data[0]), C.int(len(data))); msg != nil {
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return errors.New(C.GoString(msg))
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}
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return nil
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}); err != nil {
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return err
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}
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return nil
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}
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func (p *Player) Close() error {
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return nil
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}
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@ -12,7 +12,8 @@
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build android
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// This is not used anywhere so far. I plan to use this for iOS.
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// +build ignore
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package driver
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102
audio/internal/driver/jni_android.go
Normal file
102
audio/internal/driver/jni_android.go
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@ -0,0 +1,102 @@
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// Copyright 2015 The Go Authors. All rights reserved.
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// This file is copied from golang.org/x/mobile/internal/mobileinit/ctx_android.go
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// and editted.
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// This file is licensed under the 3-clause BSD license.
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package driver
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/*
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#include <jni.h>
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#include <stdlib.h>
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JavaVM* current_vm;
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jobject current_ctx;
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static char* lockJNI(uintptr_t* envp, int* attachedp) {
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JNIEnv* env;
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if (current_vm == NULL) {
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return "no current JVM";
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}
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*attachedp = 0;
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switch ((*current_vm)->GetEnv(current_vm, (void**)&env, JNI_VERSION_1_6)) {
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case JNI_OK:
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break;
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case JNI_EDETACHED:
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if ((*current_vm)->AttachCurrentThread(current_vm, &env, 0) != 0) {
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return "cannot attach to JVM";
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}
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*attachedp = 1;
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break;
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case JNI_EVERSION:
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return "bad JNI version";
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default:
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return "unknown JNI error from GetEnv";
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}
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*envp = (uintptr_t)env;
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return NULL;
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}
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static char* checkException(uintptr_t jnienv) {
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jthrowable exc;
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JNIEnv* env = (JNIEnv*)jnienv;
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if (!(*env)->ExceptionCheck(env)) {
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return NULL;
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}
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exc = (*env)->ExceptionOccurred(env);
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(*env)->ExceptionClear(env);
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jclass clazz = (*env)->FindClass(env, "java/lang/Throwable");
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jmethodID toString = (*env)->GetMethodID(env, clazz, "toString", "()Ljava/lang/String;");
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jobject msgStr = (*env)->CallObjectMethod(env, exc, toString);
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return (char*)(*env)->GetStringUTFChars(env, msgStr, 0);
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}
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static void unlockJNI() {
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(*current_vm)->DetachCurrentThread(current_vm);
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}
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*/
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import "C"
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import (
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"errors"
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"runtime"
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"unsafe"
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)
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func runOnJVM(fn func(vm, env, ctx uintptr) error) error {
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errch := make(chan error)
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go func() {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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env := C.uintptr_t(0)
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attached := C.int(0)
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if errStr := C.lockJNI(&env, &attached); errStr != nil {
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errch <- errors.New(C.GoString(errStr))
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return
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}
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if attached != 0 {
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defer C.unlockJNI()
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}
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vm := uintptr(unsafe.Pointer(C.current_vm))
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if err := fn(vm, uintptr(env), uintptr(C.current_ctx)); err != nil {
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errch <- err
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return
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}
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if exc := C.checkException(env); exc != nil {
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errch <- errors.New(C.GoString(exc))
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C.free(unsafe.Pointer(exc))
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return
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}
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errch <- nil
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}()
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return <-errch
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}
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