1. 홈
  2. 질의 응답
  3. AudioTrack을 사용하여 PCM을 재생하는 경우 다소 시끄럽습니다.

AudioTrack을 사용하여 PCM을 재생하는 경우 다소 시끄럽습니다.

2017-12-17 18 views
1

오디오가 서버 소켓에서 GSMbytray의 오디오 데이터를 가져 오는 중입니다. GSMDecoder를 사용하여 PCM으로 디코딩하고 재생합니다. 디코더는 길이가 33 인 바이트 배열로 gsm 데이터를 취해 길이 배열 160의 int 배열을 반환합니다.AudioTrack을 사용하여 PCM을 재생하는 경우 다소 시끄럽습니다.

우선 (for for 루프에서) 저는 GSM bytearray의 길이를 33으로 자르고 디코더에주었습니다.

int x = 33; 

//p is the GSM bytearray 
int len = p.length; 

byte[] gsmChunk; 
int[] pcmChunk; 


for (int i = 0; i < len - x + 1; i += x) { 
     gsmChunk= Arrays.copyOfRange(p, i, i + x); 
     pcmChunk= gsmDecoder.decode(gsmChunk); 
     audioStream.addData(pcmChunk); 
} 

if (len % x != 0) {//end of array 
     gsmChunk= Arrays.copyOfRange(p, len - len % x, len); 
     pcmChunk= gsmDecoder.decode(gsmChunk); 
     audioStream.addData(pcmChunk); 
} 

writeToAudioTrack(audioStream);

그런 방법 writeToAudioTrack에 전달되는 PCM 데이터를 포함하는 오디오 스트림()에 : 디코더로부터의 리턴 값은 PCM의 int 배열 된 다음 I 커스텀의 InputStream라는 오디오 스트림을 각각 복호화 청크 (pcmChunk)을 첨가 한 놀이.

private void writeToAudioTrack(InputStream is) throws IOException { 
    int i; 
    byte[] s = new byte[BUFFER_SIZE]; //BUFFER_SIZE = 64 

    while ((i = is.read(s, 0, BUFFER_SIZE)) > -1) { 
     audioTrack.write(s, 0, i); 

    } 

}

AudioTrack 이미 설정되었습니다

int sampleRate = 4200; 
    int minBufferSize = AudioTrack.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT); 
    audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, minBufferSize, AudioTrack.MODE_STREAM);

AudioStream.java : 오디오 스트림의 판독에

import java.io.IOException; 
    import java.io.InputStream; 
    import java.util.ArrayList; 


    public class AudioStream extends InputStream { 


    private ArrayList<Integer> pcm; 


    public AudioStream() { 
     pcm = new ArrayList<>(); 
    } 

    public void addData(int data[]){ 
     for(int i=0 ; i<data.length ; i++){ 
      pcm.add(data[i]); 
     } 
    } 

    @Override 
    public int read() throws IOException { 
     if(pcm.size()>0) { 
      int r= pcm.remove(0); 

      return (r>>4) & 0xFF; 
     } 
     return -1; 
    } 
}

리턴 값() 메소드

12-17 18:59:20.788 : 247 
12-17 18:59:20.788 : 249 
12-17 18:59:20.788 : 252 
12-17 18:59:20.788 : 0 
12-17 18:59:20.788 : 3 
12-17 18:59:20.788 : 247 
12-17 18:59:20.788 : 241 
12-17 18:59:20.788 : 249 
12-17 18:59:20.788 : 6 
12-17 18:59:20.788 : 11 
12-17 18:59:20.788 : 5 
12-17 18:59:20.788 : 249 
12-17 18:59:20.788 : 242 
12-17 18:59:20.788 : 249 
12-17 18:59:20.788 : 5 
12-17 18:59:20.788 : 9 
12-17 18:59:20.788 : 3 
12-17 18:59:20.788 : 247 
12-17 18:59:20.788 : 244 
12-17 18:59:20.788 : 252 
12-17 18:59:20.788 : 3 
12-17 18:59:20.788 : 6 
12-17 18:59:20.788 : 0 
12-17 18:59:20.788 : 252 
12-17 18:59:20.788 : 252 
12-17 18:59:20.788 : 0 
12-17 18:59:20.788 : 1 
12-17 18:59:20.788 : 255 
12-17 18:59:20.788 : 253 
12-17 18:59:20.788 : 252 
12-17 18:59:20.788 : 254 
12-17 18:59:20.788 : 1 
12-17 18:59:20.788 : 5 
12-17 18:59:20.788 : 3 
12-17 18:59:20.788 : 254 
12-17 18:59:20.788 : 0 
12-17 18:59:20.788 : 3 
12-17 18:59:20.788 : 2 
12-17 18:59:20.788 : 4 
12-17 18:59:20.788 : 2 
12-17 18:59:20.788 : 253 
12-17 18:59:20.788 : 253 
12-17 18:59:20.788 : 0 
12-17 18:59:20.788 : 3 
12-17 18:59:20.788 : 10 
12-17 18:59:20.788 : 5 
12-17 18:59:20.788 : 250 
12-17 18:59:20.793 : 250 
12-17 18:59:20.793 : 253 
12-17 18:59:20.793 : 2 
12-17 18:59:20.793 : 12 
12-17 18:59:20.793 : 6 
12-17 18:59:20.793 : 248 
12-17 18:59:20.793 : 248 
12-17 18:59:20.793 : 2 
12-17 18:59:20.793 : 9 
12-17 18:59:20.793 : 19 
12-17 18:59:20.793 : 13 
12-17 18:59:20.793 : 249 
12-17 18:59:20.793 : 244 
12-17 18:59:20.793 : 254 
12-17 18:59:20.793 : 8 
12-17 18:59:20.793 : 15 
12-17 18:59:20.793 : 9 
12-17 18:59:20.793 : 249 
12-17 18:59:20.793 : 245 
12-17 18:59:20.793 : 252 
12-17 18:59:20.793 : 7 
12-17 18:59:20.793 : 14 
12-17 18:59:20.793 : 11 
12-17 18:59:20.793 : 253
그리고

r >> 4에서 r >> 8으로 변경하면 결과가 더 시끄 럽습니다.

12-17 19:21:36.043 : 1 
12-17 19:21:36.043 : 254 
12-17 19:21:36.043 : 252 
12-17 19:21:36.043 : 255 
12-17 19:21:36.043 : 1 
12-17 19:21:36.043 : 1 
12-17 19:21:36.043 : 0 
12-17 19:21:36.043 : 253 
12-17 19:21:36.043 : 251 
12-17 19:21:36.043 : 255 
12-17 19:21:36.043 : 1 
12-17 19:21:36.043 : 2 
12-17 19:21:36.043 : 2 
12-17 19:21:36.043 : 1 
12-17 19:21:36.043 : 254 
12-17 19:21:36.043 : 253 
12-17 19:21:36.043 : 254 
12-17 19:21:36.043 : 254 
12-17 19:21:36.043 : 0 
12-17 19:21:36.043 : 2 
12-17 19:21:36.043 : 1 
12-17 19:21:36.043 : 255 
12-17 19:21:36.043 : 253 
12-17 19:21:36.043 : 251 
12-17 19:21:36.043 : 254 
12-17 19:21:36.043 : 2 
12-17 19:21:36.043 : 4 
12-17 19:21:36.043 : 1 
12-17 19:21:36.043 : 254 
12-17 19:21:36.043 : 250 
12-17 19:21:36.043 : 251 
12-17 19:21:36.043 : 0 
12-17 19:21:36.043 : 4 
12-17 19:21:36.043 : 4 
12-17 19:21:36.043 : 0 
12-17 19:21:36.043 : 252 
12-17 19:21:36.043 : 251 
12-17 19:21:36.043 : 255 
12-17 19:21:36.043 : 4 
12-17 19:21:36.043 : 4 
12-17 19:21:36.043 : 0 
12-17 19:21:36.048 : 251 
12-17 19:21:36.048 : 250 
12-17 19:21:36.048 : 255 
12-17 19:21:36.048 : 4 
12-17 19:21:36.048 : 5 
12-17 19:21:36.048 : 1 
12-17 19:21:36.048 : 251 
12-17 19:21:36.048 : 249 
12-17 19:21:36.048 : 253 
12-17 19:21:36.048 : 3 
12-17 19:21:36.048 : 5 
12-17 19:21:36.048 : 2 
12-17 19:21:36.048 : 253 
12-17 19:21:36.048 : 251 
12-17 19:21:36.048 : 253 
12-17 19:21:36.048 : 2 
12-17 19:21:36.048 : 3 
12-17 19:21:36.048 : 1 
12-17 19:21:36.048 : 253 
12-17 19:21:36.048 : 251 
12-17 19:21:36.048 : 254 
12-17 19:21:36.048 : 2 
12-17 19:21:36.048 : 3 
12-17 19:21:36.048 : 1 
12-17 19:21:36.048 : 1 
12-17 19:21:36.048 : 0 
12-17 19:21:36.048 : 254 
12-17 19:21:36.048 : 254 
12-17 19:21:36.048 : 255 
12-17 19:21:36.048 : 255

나는 엔디안 문제라고 생각합니다.

출처

2017-12-17 soeldiablo

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