audiorecord

问题 public AudioRecord (int audioSource, int sampleRateInHz, int channelConfig, int audioFormat, int bufferSizeInBytes) This is the Public Constructor of AudioRecord , you can find the last parameter called bufferSizeInBytes , and it means "the total size (in bytes) of the buffer where audio data is written to during the recording." in android docs. I thought this is a buffer for storing all data which is sampled from audio hardware. i have a question : If the number of data which is sampled

问题 There isn't too much info about apply this codec when we need to streaming audio. Without apply the codec, my code work like a charm establishing a communication between 2 devices but I need encode/decode in that format because I will need streaming with the server and not between two devices (I am testing this code using 2 devices). I am looking for the chance if anyone of your could see where is the key of my problem. I've tried different configurations of the input parameters. Maybe, the

问题 Why is the audioData short[] buffer I create in the code below filled with 0 upon each samplesIn += mRecordInstance.read(audioData, samplesIn, bufferSize - samplesIn); ? The size of the buffer ( audioData.length ) is NOT ZERO which means that the buffer is NOT EMPTY, it's just filled with zeros. I've tried changing the FREQUENCY to 8000 -> no change. I'm implementing the Echoprint library - please refer to this for more information on this should you require it. Proof from LogCat that the

问题 I have been following this tutorial on using LAME mp3 on Android with jni. Recording seems to be working and I am getting an output as mp3 but upon playback the audio has been slowed down and pitched down. I've tried to put all pertinent code below. Any guidance on why this is happening? Thanks in advance for your help. Edit: OK so just to check I imported the raw data into Audacity and that plays back fine so this must be an issue at the encoding stage. Java class: public class Record

问题 for a university project my prof. wants me to write an android application, would be my first one. I have some Java experience but I am new to Android programming, so please be gentle with me. First I create an Activity where I have only two buttons, one for starting an AsyncTask and one for stopping it, I mean I just set the boolean "isRecording" to false, everything else is handled in the AsyncTask, which is attached as source code. The thing is running quite okay, but after a while I can

问题 I am using AudioRecord to record raw audio for processing. The audio records entirely without any noise but when the raw PCM data generated is played back, it plays as if it has been speeded up a lot (upto about twice as much). I am viewing and playing the PCM data in Audacity. I am using actual phone (Samsung Galaxy S5670) for testing. The recording is done at 44100 Hz, 16 bit. Any idea what might cause this? Following is the recording code: public class TestApp extends Activity { File file;

问题 I get an error, when I set the sampling rate to 44100 for the AudioRecord object. When it's 22050 it works fine. 02-16 10:45:45.099 24021-24021/com.vlad.jackcomms E/AudioRecord﹕ frameCount 1024 < minFrameCount 1792 02-16 10:45:45.099 24021-24021/com.vlad.jackcomms E/AudioRecord-JNI﹕ Error creating AudioRecord instance: initialization check failed. 02-16 10:45:45.099 24021-24021/com.vlad.jackcomms E/android.media.AudioRecord﹕ Error code -20 when initializing native AudioRecord object. 02-16 10

问题 I use the following code in a Thread to capture raw audio samples from the microphone and play it back through the speaker. public void run(){ short[] lin = new short[SIZE_OF_RECORD_ARRAY]; int num = 0; // am = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE); // -> MOVED THESE TO init() // am.setMode(AudioManager.MODE_IN_COMMUNICATION); record.startRecording(); track.play(); while (passThroughMode) { // while (!isInterrupted()) { num = record.read(lin, 0, SIZE_OF_RECORD_ARRAY);

问题 I have a problem with below lines when using AudioFormat.ENCODING_PCM_8BIT as AudioFormat. When using AudioFormat.ENCODING_PCM_16BIT these work fine. bufferSize = AudioRecord.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_8BIT); audio = new AudioRecord(MediaRecorder.AudioSource.CAMCORDER, sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_8BIT, bufferSize); logcat: 03-26 10:03:49.643: E/AndroidRuntime(19949): FATAL EXCEPTION: main 03-26 10:03

问题 I am creating a tuner for Android (similar to a guitar tuner) and I am wondering how to allow the tuner to run continuously (for a couple minutes or so). I don't want it to be a service that runs in the background, just while the user is in my app. I have successfully used the AudioRecord class and am obtaining data that seems correct. I am in the process of filtering this data and finding the fundamental frequency of the input signal, but need help figuring out how to allow my tuner to run