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audio: Bug fix: Play sound correctly on Android

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This commit is contained in:
Hajime Hoshi 2016-05-26 01:46:26 +09:00
parent a2d7b438d4
commit 12d62621e9
2 changed files with 108 additions and 22 deletions
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1
audio/audio.go
View File

@ -217,6 +217,7 @@ func (c *Context) Update() error {
if n != len(buf) {
return c.driver.Close()
}
// TODO: Rename this to Enqueue
err = c.driver.Proceed(buf)
if err == io.EOF {
return c.driver.Close()

129
audio/internal/driver/driver_android.go
View File

@ -25,7 +25,8 @@ package driver
// __android_log_print(ANDROID_LOG_ERROR, "NativeCode", "foo", "bar");
static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject context,
int sampleRate, int channelNum, int bytesPerSample, jobject* audioTrack) {
int sampleRate, int channelNum, int bytesPerSample, jobject* audioTrack, int* bufferSize) {
*bufferSize = 0;
JavaVM* vm = (JavaVM*)java_vm;
JNIEnv* env = (JNIEnv*)jni_env;
@ -44,6 +45,10 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
(*env)->GetStaticIntField(
env, android_media_AudioTrack,
(*env)->GetStaticFieldID(env, android_media_AudioTrack, "MODE_STREAM", "I"));
const jint android_media_AudioTrack_WRITE_BLOCKING =
(*env)->GetStaticIntField(
env, android_media_AudioTrack,
(*env)->GetStaticFieldID(env, android_media_AudioTrack, "WRITE_BLOCKING", "I"));
const jint android_media_AudioFormat_CHANNEL_OUT_MONO =
(*env)->GetStaticIntField(
env, android_media_AudioFormat,
@ -76,16 +81,16 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
jint encoding = android_media_AudioFormat_ENCODING_PCM_8BIT;
switch (bytesPerSample) {
case 1:
channel = android_media_AudioFormat_ENCODING_PCM_8BIT;
encoding = android_media_AudioFormat_ENCODING_PCM_8BIT;
break;
case 2:
channel = android_media_AudioFormat_ENCODING_PCM_16BIT;
encoding = android_media_AudioFormat_ENCODING_PCM_16BIT;
break;
default:
return "invalid bytesPerSample";
}
const jint bufferSize =
*bufferSize =
(*env)->CallStaticIntMethod(
env, android_media_AudioTrack,
(*env)->GetStaticMethodID(env, android_media_AudioTrack, "getMinBufferSize", "(III)I"),
@ -96,11 +101,25 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
env, android_media_AudioTrack,
(*env)->GetMethodID(env, android_media_AudioTrack, "<init>", "(IIIIII)V"),
android_media_AudioManager_STREAM_MUSIC,
sampleRate, channel, encoding, bufferSize,
sampleRate, channel, encoding, *bufferSize,
android_media_AudioTrack_MODE_STREAM);
// Note that *audioTrack will never be released.
*audioTrack = (*env)->NewGlobalRef(env, tmpAudioTrack);
// Enqueue empty bytes before playing to avoid underrunning.
// TODO: Is this really needed? At least, SDL doesn't do the same thing.
jint writtenBytes = 0;
do {
const int length = 1024;
jbyteArray arr = (*env)->NewByteArray(env, length);
writtenBytes =
(*env)->CallIntMethod(
env, *audioTrack,
(*env)->GetMethodID(env, android_media_AudioTrack, "write", "([BIII)I"),
arr, 0, length, android_media_AudioTrack_WRITE_BLOCKING);
} while (writtenBytes != 0);
// TODO: Check if writtenBytes < 0
(*env)->CallVoidMethod(
env, *audioTrack,
(*env)->GetMethodID(env, android_media_AudioTrack, "play", "()V"));
@ -109,8 +128,7 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
}
static char* writeToAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject context,
jobject audioTrack, void* data, int length) {
// TODO: audioTrack object is not valid here?
jobject audioTrack, int bytesPerSample, void* data, int length) {
JavaVM* vm = (JavaVM*)java_vm;
JNIEnv* env = (JNIEnv*)jni_env;
@ -121,14 +139,40 @@ static char* writeToAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject con
env, android_media_AudioTrack,
(*env)->GetStaticFieldID(env, android_media_AudioTrack, "WRITE_NON_BLOCKING", "I"));
jbyteArray arr = (*env)->NewByteArray(env, length);
(*env)->SetByteArrayRegion(env, arr, 0, length, data);
jbyteArray arrInBytes;
jshortArray arrInShorts;
switch (bytesPerSample) {
case 1:
arrInBytes = (*env)->NewByteArray(env, length);
(*env)->SetByteArrayRegion(env, arrInBytes, 0, length, data);
break;
case 2:
arrInShorts = (*env)->NewShortArray(env, length);
(*env)->SetShortArrayRegion(env, arrInShorts, 0, length, data);
break;
}
int i = 0;
for (i = 0; i < length;) {
jint result = 0;
switch (bytesPerSample) {
case 1:
result =
(*env)->CallIntMethod(
env, audioTrack,
(*env)->GetMethodID(env, android_media_AudioTrack, "write", "([BIII)I"),
arrInBytes, i, length - i, android_media_AudioTrack_WRITE_NON_BLOCKING);
break;
case 2:
result =
(*env)->CallIntMethod(
env, audioTrack,
(*env)->GetMethodID(env, android_media_AudioTrack, "write", "([SIII)I"),
arrInShorts, i, length - i, android_media_AudioTrack_WRITE_NON_BLOCKING);
break;
}
i += result;
}
jint result =
(*env)->CallIntMethod(
env, audioTrack,
(*env)->GetMethodID(env, android_media_AudioTrack, "write", "([BIII)I"),
arr, 0, length, android_media_AudioTrack_WRITE_NON_BLOCKING);
// TODO: Check the result.
return NULL;
}
@ -138,6 +182,7 @@ import "C"
import (
"errors"
"sync"
"unsafe"
)
@ -146,6 +191,10 @@ type Player struct {
channelNum int
bytesPerSample int
audioTrack C.jobject
buffer []byte
bufferSize int
m sync.Mutex
chErr chan error
}
func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
@ -153,15 +202,19 @@ func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
sampleRate: sampleRate,
channelNum: channelNum,
bytesPerSample: bytesPerSample,
buffer: []byte{},
chErr: make(chan error),
}
if err := runOnJVM(func(vm, env, ctx uintptr) error {
audioTrack := C.jobject(nil)
bufferSize := C.int(0)
if msg := C.initAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
C.int(sampleRate), C.int(channelNum), C.int(bytesPerSample),
&audioTrack); msg != nil {
&audioTrack, &bufferSize); msg != nil {
return errors.New(C.GoString(msg))
}
p.audioTrack = audioTrack
p.bufferSize = int(bufferSize)
return nil
}); err != nil {
return nil, err
@ -170,15 +223,47 @@ func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
}
func (p *Player) Proceed(data []byte) error {
if err := runOnJVM(func(vm, env, ctx uintptr) error {
if msg := C.writeToAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
p.audioTrack, unsafe.Pointer(&data[0]), C.int(len(data))); msg != nil {
return errors.New(C.GoString(msg))
}
return nil
}); err != nil {
select {
case err := <-p.chErr:
return err
default:
}
p.buffer = append(p.buffer, data...)
if len(p.buffer) < p.bufferSize {
return nil
}
bufInBytes := p.buffer[:p.bufferSize]
var bufInShorts []int16
if p.bytesPerSample == 2 {
bufInShorts = make([]int16, len(bufInBytes)/2)
for i := 0; i < len(bufInShorts); i++ {
bufInShorts[i] = int16(bufInBytes[2*i]) | (int16(bufInBytes[2*i+1]) << 8)
}
}
p.buffer = p.buffer[p.bufferSize:]
go func() {
p.m.Lock()
defer p.m.Unlock()
if err := runOnJVM(func(vm, env, ctx uintptr) error {
msg := (*C.char)(nil)
switch p.bytesPerSample {
case 1:
msg = C.writeToAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
p.audioTrack, C.int(p.bytesPerSample),
unsafe.Pointer(&bufInBytes[0]), C.int(len(bufInBytes)))
case 2:
msg = C.writeToAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
p.audioTrack, C.int(p.bytesPerSample),
unsafe.Pointer(&bufInShorts[0]), C.int(len(bufInShorts)))
}
if msg != nil {
return errors.New(C.GoString(msg))
}
return nil
}); err != nil {
p.chErr <- err
}
}()
return nil
}