Android dump数据到文件

void writepcmtofile(const char * fname,const void* buffer, size_t bytes) { static FILE *fp=NULL; if(fp==NULL || access( fname, F_OK )==-1){ fp = fopen(fname, "ab+" ); if(fp==NULL){ ALOGI("can't open file!"); fp=NULL; return; } } if(fp!=NULL){ fwrite(buffer , 1 , bytes , fp ); ALOGI("write to file %d bytes",bytes); } }

注意，File设置为static的目的是为了更快，但是两个地方同时使用这个函数的时候，因为File只有一个，就会有问题。所以应该改成非静态的。

Android录音，播放，dump数据位置：

ssize_t AudioFlinger::PlaybackThread::threadLoop_write() { ... ... ssize_t framesWritten = mNormalSink->write( (char *) mSinkBuffer + offset, count); writepcmtofile("/data/test/play.pcm",(int8_t *)inShort, lengthIn * 2); } bool AudioFlinger::RecordThread::threadLoop() { if (mPipeSource != 0) { ...... } // otherwise use the HAL / AudioStreamIn directly } else { ssize_t bytesRead = mInput->stream->read(mInput->stream, (uint8_t*) mRsmpInBuffer + rear * mFrameSize, mBufferSize); writepcmtofile("/data/test/clean.pcm",(uint8_t*) mRsmpInBuffer + rear * mFrameSize, bytesRead); }

如果写不成功，很可能是因为seLinux，这时候写到/user/data下，并设置 adb shell setenforce 0

Java里面的写法：

public static void writeToFile(byte[] mBuffer, String filename, boolean encoded, int quality) { if (Dbg.isVerbose() || true) { try { boolean logDirExists; String folder = Dbg.LOG_DIR; if (!folder.endsWith(File.separator)) { folder += File.separatorChar; } File f = new File(folder); if (!f.exists()) { logDirExists = f.mkdirs(); } else { logDirExists = true; } if (!logDirExists) { return; } String path = folder + filename; if (encoded) { path += "_q" + quality + ".speex"; } else { path += ".pcm"; } File file = new File(path); // if file doesnt exists, then create it if (!file.exists()) { file.createNewFile(); } FileOutputStream stream = new FileOutputStream(file.getAbsoluteFile(), true); try { stream.write(mBuffer); } finally { stream.close(); } } catch (IOException e) { Log.e("Audio Dump", "Exception", e); } } }