我正在尝试使用 android mediarecorder 将我的录音拆分为多个文件，但每当我设置下一个输出文件时，我都会遇到 illegalstate 异常。
代码如下:
private void getMediaRecorderReady(String filePath, FileDescriptor nextFile) {
bufferSize = 88200;
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.AAC_ADTS);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
recorder.setAudioEncodingBitRate(64000);
recorder.setAudioSamplingRate(44100);
recorder.setAudioChannels(1);
recorder.setOutputFile(filePath);
recorder.setMaxDuration(1000);
recorder.setMaxFileSize(100000);
try {
recorder.prepare();
recorder.setNextOutputFile(nextFile);
} catch (IOException e) {
e.printStackTrace();
}
}
这里是错误:
E/MediaRecorder: setNextOutputFile failed: -38
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.a49164.teachmi, PID: 31554
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:353)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.lang.IllegalStateException
at android.media.MediaRecorder._setNextOutputFile(Native Method)
at android.media.MediaRecorder.setNextOutputFile(MediaRecorder.java:878)
at com.example.a49164.teachmi.ExComThread.getMediaRecorderReady(ExComThread.java:189)
at com.example.a49164.teachmi.ExComThread.soundTransfer(ExComThread.java:211)
at com.example.a49164.teachmi.ExComThread.doInBackground(ExComThread.java:82)
at com.example.a49164.teachmi.ExComThread.doInBackground(ExComThread.java:46)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
所以，在做了一些挖掘之后，错误 -38 等于“-ENOSYS”或“INVALID_OPERATION”，这似乎发生在记录器为空或未调用 prepare 的情况下(但我确实先调用了 prepare() ).
这里是一些原生的android代码:
enum {
OK = 0, // Everything's swell.
NO_ERROR = 0, // No errors.
UNKNOWN_ERROR = 0x80000000,
NO_MEMORY = -ENOMEM,
INVALID_OPERATION = -ENOSYS,
BAD_VALUE = -EINVAL,
BAD_TYPE = 0x80000001,
NAME_NOT_FOUND = -ENOENT,
PERMISSION_DENIED = -EPERM,
NO_INIT = -ENODEV,
ALREADY_EXISTS = -EEXIST,
DEAD_OBJECT = -EPIPE,
FAILED_TRANSACTION = 0x80000002,
JPARKS_BROKE_IT = -EPIPE,
#if !defined(HAVE_MS_C_RUNTIME)
BAD_INDEX = -EOVERFLOW,
NOT_ENOUGH_DATA = -ENODATA,
WOULD_BLOCK = -EWOULDBLOCK,
TIMED_OUT = -ETIMEDOUT,
UNKNOWN_TRANSACTION = -EBADMSG,
#else
BAD_INDEX = -E2BIG,
NOT_ENOUGH_DATA = 0x80000003,
WOULD_BLOCK = 0x80000004,
TIMED_OUT = 0x80000005,
UNKNOWN_TRANSACTION = 0x80000006,
#endif
FDS_NOT_ALLOWED = 0x80000007,
};
native 下一个输出文件:
status_t MediaRecorder::setNextOutputFile(int fd)
{
ALOGV("setNextOutputFile(%d)", fd);
if (mMediaRecorder == NULL) {
ALOGE("media recorder is not initialized yet");
return INVALID_OPERATION;
}
// It appears that if an invalid file descriptor is passed through
// binder calls, the server-side of the inter-process function call
// is skipped. As a result, the check at the server-side to catch
// the invalid file descritpor never gets invoked. This is to workaround
// this issue by checking the file descriptor first before passing
// it through binder call.
int flags = fcntl(fd, F_GETFL);
if (flags == -1) {
ALOGE("Fail to get File Status Flags err: %s", strerror(errno));
}
// fd must be in read-write mode or write-only mode.
if ((flags & (O_RDWR | O_WRONLY)) == 0) {
ALOGE("File descriptor is not in read-write mode or write-only mode");
return BAD_VALUE;
}
status_t ret = mMediaRecorder->setNextOutputFile(fd);
if (OK != ret) {
ALOGE("setNextOutputFile failed: %d", ret);
}
return ret;
}
我可能对 -38 等于 -ENOSYS 这一事实有误，但我仍然不知道为什么它不起作用，因为我正在传递一个文件描述符并在准备后调用它，如 android 文档中所述.
非常欢迎您的帮助，谢谢!
编辑:我试图在准备后立即删除 setNextOutputFile(nextFile)，只保留一个:
recorder.setOnInfoListener(new MediaRecorder.OnInfoListener() {
@Override
public void onInfo(MediaRecorder mr, int infoCode, int extra) {
System.out.println("----------------------------------------onMaxFileSizeApproaching " + infoCode);
if (infoCode == MediaRecorder.MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED) {
System.out.println("max sized reached");
String path = Environment.getExternalStorageDirectory().getPath() + "/dataSound" + currFile + ".aac";
File nextFile = new File(path);
try {
FileOutputStream fos = new FileOutputStream(nextFile);
recorder.setNextOutputFile(fos.getFD());
} catch (IOException e) {
e.printStackTrace();
}
String currPath = Environment.getExternalStorageDirectory().getPath() + "/dataSound" + (currFile - 1) + ".aac";
sendDataPath = currPath;
currFile++;
}
}
});
但是没有用...
最佳答案
这意味着 setNextOutputFile() 在 prepare() 之前被调用 finish it's own work .
所以你应该等到你的文件按照documentation中的讨论准备好.
在切换到该输出之前不会使用该文件。申请会收到MEDIA_RECORDER_INFO_NEXT_OUTPUT_FILE_STARTED
您应该像这样收听文件信息:
recorder.setOnInfoListener(new MediaRecorder.OnInfoListener() {
@Override
public void onInfo(MediaRecorder mediaRecorder, int what, int extra) {
if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED)
recorder.setNextOutputFile(nextFile);
}
});
还有在使用下一个输出文件时。如果之前的输出文件未被使用，应用程序将无法设置新的输出文件。调用 stop() 后，应用程序负责清理未使用的文件。
关于Android Mediarecorder setNextOutputFile IllegalStateException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51127260/