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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