android - AudioRecord returns some empty data after start -


i wrote standard code receiving data microphone using audiorecord. here code:

audioreceiver() {     int minhardwarebuffersize = audiorecord.getminbuffersize(sample_rate,             channel_config, audio_format);     log.d(tag, "minhardwarebuffersize = " + minhardwarebuffersize);     int buffersizebytes = (minhardwarebuffersize > min_buffer_size_bytes) ?             minhardwarebuffersize : min_buffer_size_bytes;     buffersizeshorts = buffersizebytes / 2;      //резервируем буфер с запасом в 2 раза     audiorecorder = new audiorecord(mediarecorder.audiosource.mic,             sample_rate, channel_config, audio_format, buffersizebytes * 2);      teststack = new short[buffersizeshorts * 4];     arrays.fill(teststack, (short) 2000); }   boolean startreceive() {     audiorecorder.startrecording();     isreceiving = true;     int recordingstate = audiorecorder.getrecordingstate();     log.d(tag, "recordingstate = " + recordingstate);     new thread(receivingrunnable).start();     return (recordingstate == audiorecord.recordstate_recording); }   boolean stopreceive() {     isreceiving = false;     audiorecorder.stop();     int recordingstate = audiorecorder.getrecordingstate();     log.d(tag, "recordingstate = " + recordingstate);     return (recordingstate == audiorecord.recordstate_stopped); }   private runnable receivingrunnable = new runnable() {     @override     public void run() {         int readcount = 0;         short[] databuffer = new short[buffersizeshorts];         while (isreceiving) {             testbusy = true;             (int j = 0; j < 4; j++) {                 readcount = audiorecorder.read(databuffer, 0, databuffer.length);                 log.d(tag, "receive " + readcount + " bytes");                 system.arraycopy(databuffer, 0, teststack, buffersizeshorts * j, readcount);             }             isreceiving = false;             testbusy = false;         }     } };

but noticed after first start of startreceive function, @ beginning of teststack buffer, there empty data (about 1000 samples on nexus 4, see data graph).

data graph

between initialization of audioreceiver , launch of startreceive takes long time. cause of problem?


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