mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
261 lines
7.6 KiB
Go
261 lines
7.6 KiB
Go
// 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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#include <jni.h>
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#include <stdlib.h>
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static char* initAudioTrack(uintptr_t java_vm, uintptr_t jni_env,
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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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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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encoding = android_media_AudioFormat_ENCODING_PCM_8BIT;
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break;
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case 2:
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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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*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,
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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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const jclass android_media_AudioTrack =
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(*env)->FindClass(env, "android/media/AudioTrack");
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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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jint result;
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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", "([BII)I"),
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arrInBytes, 0, length);
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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", "([SII)I"),
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arrInShorts, 0, length);
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break;
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}
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switch (result) {
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case -3: // ERROR_INVALID_OPERATION
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return "invalid operation";
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case -2: // ERROR_BAD_VALUE
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return "bad value";
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case -1: // ERROR
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return "error";
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}
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if (result < 0) {
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return "unknown error";
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}
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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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"github.com/hajimehoshi/ebiten/internal/jni"
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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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buffer []byte
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bufferSize int
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chErr chan error
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chBuffer chan []byte
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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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buffer: []byte{},
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chErr: make(chan error),
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chBuffer: make(chan []byte, 8),
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}
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if err := jni.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),
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C.int(sampleRate), C.int(channelNum), C.int(bytesPerSample),
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&audioTrack, &bufferSize); msg != nil {
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return errors.New("driver: " + 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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}
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go p.loop()
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return p, nil
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}
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func (p *Player) loop() {
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for bufInBytes := range p.chBuffer {
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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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if err := jni.RunOnJVM(func(vm, env, ctx uintptr) error {
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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),
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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),
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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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default:
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panic("not reach")
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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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p.chErr <- err
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return
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}
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}
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}
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func (p *Player) Proceed(data []byte) error {
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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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buf := p.buffer[:p.bufferSize]
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select {
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case p.chBuffer <- buf:
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case err := <-p.chErr:
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return err
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}
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p.buffer = p.buffer[p.bufferSize:]
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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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