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https://github.com/hajimehoshi/ebiten.git
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audio: Bug fix: Play sound correctly on Android
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parent
a2d7b438d4
commit
12d62621e9
@ -217,6 +217,7 @@ func (c *Context) Update() error {
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if n != len(buf) {
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return c.driver.Close()
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}
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// TODO: Rename this to Enqueue
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err = c.driver.Proceed(buf)
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if err == io.EOF {
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return c.driver.Close()
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@ -25,7 +25,8 @@ package driver
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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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int sampleRate, int channelNum, int bytesPerSample, jobject* audioTrack, int* bufferSize) {
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*bufferSize = 0;
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JavaVM* vm = (JavaVM*)java_vm;
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JNIEnv* env = (JNIEnv*)jni_env;
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@ -44,6 +45,10 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
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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_AudioTrack_WRITE_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_BLOCKING", "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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@ -76,16 +81,16 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
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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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encoding = 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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encoding = 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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*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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@ -96,11 +101,25 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
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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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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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// Enqueue empty bytes before playing to avoid underrunning.
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// TODO: Is this really needed? At least, SDL doesn't do the same thing.
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jint writtenBytes = 0;
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do {
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const int length = 1024;
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jbyteArray arr = (*env)->NewByteArray(env, length);
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writtenBytes =
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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_BLOCKING);
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} while (writtenBytes != 0);
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// TODO: Check if writtenBytes < 0
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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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@ -109,8 +128,7 @@ static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject contex
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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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jobject audioTrack, int bytesPerSample, void* data, int length) {
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JavaVM* vm = (JavaVM*)java_vm;
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JNIEnv* env = (JNIEnv*)jni_env;
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@ -121,14 +139,40 @@ static char* writeToAudioTrack(uintptr_t java_vm, uintptr_t jni_env, jobject con
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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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jbyteArray arrInBytes;
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jshortArray arrInShorts;
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switch (bytesPerSample) {
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case 1:
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arrInBytes = (*env)->NewByteArray(env, length);
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(*env)->SetByteArrayRegion(env, arrInBytes, 0, length, data);
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break;
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case 2:
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arrInShorts = (*env)->NewShortArray(env, length);
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(*env)->SetShortArrayRegion(env, arrInShorts, 0, length, data);
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break;
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}
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int i = 0;
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for (i = 0; i < length;) {
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jint result = 0;
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switch (bytesPerSample) {
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case 1:
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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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arrInBytes, i, length - i, android_media_AudioTrack_WRITE_NON_BLOCKING);
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break;
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case 2:
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result =
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(*env)->CallIntMethod(
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env, audioTrack,
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(*env)->GetMethodID(env, android_media_AudioTrack, "write", "([SIII)I"),
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arrInShorts, i, length - i, android_media_AudioTrack_WRITE_NON_BLOCKING);
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break;
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}
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i += result;
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}
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// TODO: Check the result.
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return NULL;
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}
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@ -138,6 +182,7 @@ import "C"
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import (
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"errors"
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"sync"
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"unsafe"
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)
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@ -146,6 +191,10 @@ type Player struct {
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channelNum int
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bytesPerSample int
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audioTrack C.jobject
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buffer []byte
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bufferSize int
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m sync.Mutex
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chErr chan error
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}
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func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
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@ -153,15 +202,19 @@ func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
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sampleRate: sampleRate,
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channelNum: channelNum,
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bytesPerSample: bytesPerSample,
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buffer: []byte{},
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chErr: make(chan error),
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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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bufferSize := C.int(0)
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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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&audioTrack, &bufferSize); 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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p.bufferSize = int(bufferSize)
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return nil
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}); err != nil {
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return nil, err
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@ -170,15 +223,47 @@ func NewPlayer(sampleRate, channelNum, bytesPerSample int) (*Player, error) {
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}
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func (p *Player) Proceed(data []byte) error {
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select {
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case err := <-p.chErr:
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return err
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default:
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}
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p.buffer = append(p.buffer, data...)
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if len(p.buffer) < p.bufferSize {
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return nil
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}
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bufInBytes := p.buffer[:p.bufferSize]
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var bufInShorts []int16
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if p.bytesPerSample == 2 {
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bufInShorts = make([]int16, len(bufInBytes)/2)
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for i := 0; i < len(bufInShorts); i++ {
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bufInShorts[i] = int16(bufInBytes[2*i]) | (int16(bufInBytes[2*i+1]) << 8)
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}
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}
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p.buffer = p.buffer[p.bufferSize:]
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go func() {
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p.m.Lock()
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defer p.m.Unlock()
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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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msg := (*C.char)(nil)
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switch p.bytesPerSample {
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case 1:
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msg = C.writeToAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
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p.audioTrack, C.int(p.bytesPerSample),
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unsafe.Pointer(&bufInBytes[0]), C.int(len(bufInBytes)))
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case 2:
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msg = C.writeToAudioTrack(C.uintptr_t(vm), C.uintptr_t(env), C.jobject(ctx),
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p.audioTrack, C.int(p.bytesPerSample),
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unsafe.Pointer(&bufInShorts[0]), C.int(len(bufInShorts)))
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}
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if 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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p.chErr <- err
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}
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}()
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return nil
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}
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