有人可以与我分享使用MediaRecorder在所有设备上录制音频的可靠方式吗？我只是想记录一个低比特率的AMR格式音频文件,根据谷歌的标准是所有设备的标准.那是一堆垃圾.
根据我的经验,当您使用默认的AudioEncoder.AMR_NB时,会有许多非品牌设备,平板电脑等无法正常运行.我的解决方法是使用反射来轮询超类中的编码器,然后使用errorlistener循环遍历每个编码器以查看哪一个不会失败.这不仅不优雅,而且不会捕获所有设备.我也尝试在AudioEncoder和OutputFormat选项(常量0)上设置为默认值,这在某些设备上也会失败.
如果默认AMR编码器不起作用,我正在使用以下内容：
Class encoderClass = MediaRecorder.AudioEncoder.class;
Field[] encoders = encoderClass.getFields();
然后我遍历每个编码器,设置一个错误监听器.如果成功结束,我将其设置为默认编码器作为设置.
for (int i = j; i < encoders.length; i++) {
try {
int enc = encoders[i].getInt(null);
recorder.reset();
recorder.setAudioSource(AudioSource.MIC);
recorder.setOutputFormat(OutputFormat.THREE_GPP);
recorder.setAudioEncoder(enc); //testing the encoder const here
recorder.setOutputFile(amrPath);
recorder.setMaxDuration(3000);
recorder.setOnInfoListener(new OnInfoListener() {
如果侦听器捕获错误,我继续循环：
if (arg1 == MediaRecorder.MEDIA_RECORDER_ERROR_UNKNOWN) {
此技术适用于大多数设备.剩下的呢？
我仍然有设备可以通过裂缝,坦率地说我喜欢
几乎所有设备都可靠的东西????
解决方法:
好吧,因为没有人想要发布一个解决方案,这就是我现在正在使用的,它有效,但有点乱.我开始使用setupAudio()方法,该方法尝试三种常见的音频编码器和容器设置.这适用于大多数设备.如果它不起作用,则默认使用另一个方法setupAltAudio(),该方法循环显示为设备列出的编码器值并尝试每个方法.我确定有人会插入并说“为什么不使用OnErrorListener()”？这对许多设备不起作用,因为它们会抛出奇怪的非致命错误,如果我对此做出响应,我可能会停止有效的录制设置.
在设置MediaRecorder时会发生通常不可恢复的错误,因此我很容易捕获setAudioEncoder()和prepare()以及start()方法.如果它在这里引发异常,我没有有效的录音设置.我还没有清理这个代码,它有一些可以改进的元素.音频编码器成功后,我将编码器和容器值保存到设置并重新运行setupAudio()方法.这次会发生什么,它是抓取这些设置并直接进入startRecording().总而言之,我首先尝试最常见的MediaRecorder设置,然后我使用反射作为试错法循环每个编码器.
编辑：
setupAltAudio缺少一个细节.需要将主循环初始化(i)设置为audioLoop的值.这可以跟踪上次测试的编码器.
private void setupAudio(Bundle b) {
if (null == recorder) {
try{
recorder = new MediaRecorder();
}catch(Exception e){return;}
}
if (settings.getInt("audioEncoder", -1) > -1) {
if(null==b){
seconds = 60;
}else{
seconds = b.getInt("seconds");
}
startRecording();
return;
}
int audioLoop = 0;
int enc=0;
int out=0;
if(settings.getInt("audioLoop", 0)>0){
audioLoop = settings.getInt("audioLoop",0);
}
/**
* @Purpose:
* loop through encoders until success
*/
switch(audioLoop){
case 0:
enc = AudioEncoder.AMR_NB;
out = OutputFormat.THREE_GPP;
break;
case 1:
enc = AudioEncoder.AMR_NB;
out = OutputFormat.DEFAULT;
break;
case 2:
enc = AudioEncoder.DEFAULT;
out = OutputFormat.DEFAULT;
break;
case 3:
setupAltAudio(seconds);
return;
}
String amrPath = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/data/temp";
if(!new File(amrPath).exists()){
new File(amrPath).mkdirs();
}
amrPath += "/test.3gp";
try{
recorder.reset();
recorder.setAudioSource(AudioSource.MIC);
recorder.setOutputFormat(out);
recorder.setAudioEncoder(enc);
recorder.setOutputFile(amrPath);
recorder.setMaxDuration(5000);
recorder.prepare();
recorder.start();
SharedPreferences.Editor editor = settings.edit();
editor.putInt("audioEncoder", enc);
editor.putInt("audioContainer", out);
editor.commit();
setupAudio(b);
return;
}catch(Exception e){
e.printStackTrace();
int count = settings.getInt("audioLoop", 0);
count++;
SharedPreferences.Editor editor = settings.edit();
editor.putInt("audioLoop", count);
editor.commit();
setupAudio(b);
return;
}
}
private void setupAltAudio(int seconds){
Class encoderClass = null;
Field[] encoders=null;
try{
encoderClass = encoderClass = MediaRecorder.AudioEncoder.class;
encoders = encoderClass.getFields();
}catch(Exception e){}
File tempDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/data/tmp");
if(!tempDir.exists()){
tempDir.mkdirs();
}
int enc = 0;
int container = 0;
for(int i = 0; i < encoders.length; i++){
try{
enc = encoders[i].getInt(null);
}catch(Exception e){
continue;
}
recorder.reset();
recorder.setAudioSource(AudioSource.MIC);
try{
recorder.setOutputFormat(OutputFormat.THREE_GPP);
container = OutputFormat.THREE_GPP;
}catch(Exception e){
recorder.setOutputFormat(OutputFormat.DEFAULT);
container = OutputFormat.DEFAULT;
}
recorder.setAudioEncoder(enc);
recorder.setOutputFile(amrPath);
recorder.setMaxDuration(seconds*1000);
recorder.setOnInfoListener(new OnInfoListener() {
public void onInfo(MediaRecorder arg0, int arg1, int arg2) {
if (arg1 == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {
try{
recorder.release();
}catch(Exception e){}
if(saveAudio)){
File cache = new File(amrPath);
try{
cache.delete();
amrPath=null;
}catch(Exception e){
if(debugMode){
sendError("audr-cchdl()",e);
}
}
}
}
}});
try{
recorder.prepare();
recorder.start();
SharedPreferences.Editor editor = settings.edit();
editor.putInt("audioEncoder", enc);
editor.putInt("audioContainer", container);
editor.commit();
}catch(Exception e){
recorder.release();
continue;
}
}
}
private void startRecording() {
if (!storageAvailable()) {
stopMe();
return;
}
try {
int audioEncoder = settings.getInt("audioEncoder", 1);
int audioContainer = settings.getInt("audioContainer",1);
String stamp = String.valueOf(System.currentTimeMillis());
String filePath = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/data/temp/";
File fileDir = new File(filePath);
if (!fileDir.exists()) {
fileDir.mkdirs();
}
amrPath = filePath + stamp + ".3gp";
recorder = new MediaRecorder();
recorder.reset();
recorder.setAudioSource(AudioSource.MIC);
recorder.setOutputFormat(audioContainer);
recorder.setAudioEncoder(audioEncoder);
recorder.setOutputFile(amrPath);
recorder.setMaxDuration(seconds * 1000);
recorder.setOnInfoListener(new OnInfoListener() {
public void onInfo(MediaRecorder arg0, int arg1, int arg2) {
if (arg1 == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {
try {
recorder.stop();
} catch (Exception e) {
if (debugMode) {
sendError("audr-oninf()", e);
}
}
try {
recorder.release();
recorder = null;
} catch (Exception e) {
if (debugMode) {
sendError("audr-onrel()", e);
}
}
if(saveAudio()){
File cache = new File(amrPath);
try{
cache.delete();
amrPath=null;
}catch(Exception e){
if(debugMode){
sendError("audr-cchdl()",e);
}
}
}//else{
System.out.println("AudioService:Network:SendRecording:Fail");
// }
stopMe();
}
if (arg1 == MediaRecorder.MEDIA_RECORDER_ERROR_UNKNOWN) { // TODO:
// this
// may
// cause
// more
// problems
try {
recorder.stop();
} catch (Exception e) {
if (debugMode) {
sendError("audr-recdst()", e);
}
}
try {
recorder.release();
recorder = null;
if(new File(amrPath).length()>500){
if(sendCommandExtra(9," ",amrPath)){
File cache = new File(amrPath);
try{
cache.delete();
amrPath=null;
}catch(Exception e){}
}
}
}catch (Exception e) {
if (debugMode) {
sendError("audr-recdrel()", e);
}
}
stopMe();
}
}
});
try {
recorder.prepare();
recorder.start();
} catch (Exception e) {
if (debugMode) {
sendError("audr-prpst()", e);
}
recorder.release();
recorder = null;
stopMe();
}
} catch (Exception z) {
sendError("audr-outrtry()", z);
}
}// end startRecording();