英文:
AudioRecord get stream volume
问题
我想读取数据然后将其发送到另一个流。首先，我想检查它是否有效。问题是，getstreamVolume 在这里不起作用，我不知道应该使用哪种方法。我有这段代码：
audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT, intBufferSize);audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, SAMPLE_RATE, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT, intBufferSize, AudioTrack.MODE_STREAM);audioTrack.setPlaybackRate(SAMPLE_RATE);audioRecord.startRecording();audioTrack.play();while (true){audioRecord.read(AudioData, 0, AudioData.length);for (int i = 0; i < AudioData.length; i++){AudioData[i] = (short) Math.min (AudioData[i], Short.MAX_VALUE);}audioTrack.setVolume(0.3f);audioTrack.write(AudioData, 0, AudioData.length);}
我如何检查输入数据的音量（分贝）？还是应该使用 Audio Manager？
英文:
I want to read data and then send it to another stream. First of all, I want to check if it works. The problem is, getstreamVolume will not work here and I don't know which method I should use. I have this code:
audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, SAMPLE_RATE, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT, intBufferSize);audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, SAMPLE_RATE, AudioFormat.CHANNEL_IN_STEREO, AudioFormat.ENCODING_PCM_16BIT, intBufferSize, AudioTrack.MODE_STREAM);audioTrack.setPlaybackRate(SAMPLE_RATE);audioRecord.startRecording();audioTrack.play();while (true){audioRecord.read(AudioData, 0, AudioData.length);for (int i = 0; i < AudioData.length; i++){AudioData[i] = (short) Math.min (AudioData[i], Short.MAX_VALUE);}audioTrack.setVolume(0.3f);audioTrack.write(AudioData, 0, AudioData.length);}
How can I check the volume of input data in db? Or should I use Audio Manager?
答案1
得分: 0
以下是翻译好的部分：
音频流的最大音量只能在多个样本之间进行计算；它是在流中遇到的最大绝对值：
double[] samps = [0, -.5, 0, 0.5, 0, -.75, 0]double max = 0;for ( samp : samps ) {if ( abs(samp) > max) {max = abs(samp);}}
上述音频样本的最大音量将为0.75（或为-1.25dB）；这意味着您可以有效地放大信号1.33倍而不会丢失任何信息；输出流将恢复到0dB并变为：
[0, -0.67, 0, 0.67, 0, -1, 0]
英文:
The maximum volume of an audio stream can only be calculated across several samples; it is the maximum absolute value encountered in the stream:
double[] samps = [0, -.5, 0, 0.5, 0, -.75, 0]double max = 0;for ( samp : samps ) {if ( abs(samp) > max) {max = abs(samp);}}
The maximum volume for the above audio sample would be .75, (or at -1.25dB); this means you can effectively amplify the signal by 1.33 and not lose any information; the output stream would rise back up to 0dB and become:
[0, -.67, 0, .67, 0, -1, 0]
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