使用AudioTrack播放wav文件

    近期使用AudioTrack播放wav文件的时候出现开头爆音的现象，分析后得知wav文件有个44或46字节的头数据，在使用AudioTrack播放写入数据时要把这个头数据去掉即可。源码实例如下：

  private static final int STREAM_TYPE = AudioManager.STREAM_MUSIC;//音频流类型
  private static final int SAMPLERATE_HZ = 16000;//采样率
  private static final int CHANNEL_CONFIG = AudioFormat.CHANNEL_CONFIGURATION_MONO;//捕获音频的声道数目
  private static final int AUDIO_FORMAT = AudioFormat.ENCODING_PCM_16BIT;//音频量化位，脉冲编码调制
    /**
     * 启动播放
     * @param voicename
     */
  public void startPlay(String voicename) {
        try {
            String path = LOCALTTS_VOICE_MAP.get(voicename);
            setPath(path);
            byte[] tempBuffer = new byte[mMinBufferSize];
            int readCount = 0;
			int count = 0;
            while (mInputStream.available() > 0) {
                if (mInputStream == null) {
                    return;
                }
                readCount = mInputStream.read(tempBuffer);
                if (readCount == AudioTrack.ERROR_INVALID_OPERATION || readCount == AudioTrack.ERROR_BAD_VALUE) {
                    continue;
                }
                if (readCount != 0 && readCount != -1) {
				    //判断AudioTrack未初始化，停止播放的时候释放了，状态就为STATE_UNINITIALIZED
                    if (mAudioTrack.getState() == AudioTrack.STATE_UNINITIALIZED) {
					    //根据采样率，采样精度，单双声道来得到frame的大小。
                        //按照数字音频的知识，这个算出来的是一秒钟buffer的大小。
                        mMinBufferSize = AudioTrack.getMinBufferSize(SAMPLERATE_HZ, CHANNEL_CONFIG, AUDIO_FORMAT);
                        mAudioTrack = new AudioTrack(STREAM_TYPE, SAMPLERATE_HZ, CHANNEL_CONFIG, AUDIO_FORMAT,
                            mMinBufferSize, mMode);
                    }
                    mAudioTrack.play();
//由于这是播放pcm文件和wav文件的通用接口，在这里检测若是wav文件且为第一轮读取字节数据时，将前44个字节的头数据忽略
                    if (voicename.contains(".wav") && count == 0) {
                        mAudioTrack.write(tempBuffer, 44, readCount);
                    } else {
                        mAudioTrack.write(tempBuffer, 0, readCount);
                    }
		    count++;
                }
            }
            stopPlay();
        } catch (Exception e) {
            Log.i(TAG, "startPlayException:" + e.toString());
        }
    }

    /**
     * 添加播放文件
     * @param path
     */
    private void setPath(String path) {
        File file = new File(path);
        try {
            if (mInputStream == null) {
                mInputStream = new DataInputStream(new FileInputStream(file));
            }
        } catch (Exception e) {
            Log.i(TAG, "setPathException:" + e.toString());
        }
    }

    /**
     * 停止播放
     */
    public void stopPlay() {
        CoreStub.getInstance().onSpeechState(Constant.STATE_SPEAK_END);
        if (mAudioTrack != null) {
            if (mAudioTrack.getState() == AudioRecord.STATE_INITIALIZED) {
                mAudioTrack.stop();
            }
            if (mAudioTrack != null) {
                mAudioTrack.release();
            }
        }
        if (mInputStream != null) {
            try {
                mInputStream.close();
                mInputStream = null;
            } catch (IOException e) {
                Log.i(TAG, "stopPlayException:" + e.toString());
            }
        }
    }

 

本文地址：https://blog.csdn.net/Arise_Yang/article/details/107919468