如何在录制音频的android调整麦克风灵敏度 - 已解决 [英] How to adjust microphone sensitivity while recording audio in android - Solved

问题描述

我正在录音的应用程序。在app我有一个搜索栏更改输入声音的增益。 我寻觅了很多，但无法找到任何方式来调整输入声音的增益。

我使用AudioRecord类录制的声音。

 记录=新AudioRecord（MediaRecorder.AudioSource.MIC，
            RECORDER_SAMPLERATE，RECORDER_CHANNELS，
            RECORDER_AUDIO_ENCODING，缓冲区大小）;

    recorder.startRecording（）;
 

我已经看到了一个应用程序也在其中使用此功能Play商店。

https://play.google.com/store/应用程序/详细信息？ID = com.grace.microphone

感谢

修改

我已经用做了

 最终诠释USHORT_MASK =（1＆LT;＆LT; 16） -  1;

最后ByteBuffer的BUF = ByteBuffer.wrap（数据）.order（
                        ByteOrder.LITTLE_ENDIAN）;
最后的ByteBuffer newBuf = ByteBuffer.allocate（
                        data.length）.order（ByteOrder.LITTLE_ENDIAN）;

INT样品;
        而（buf.hasRemaining（））{
                样本=（int）的buf.getShort（）及USHORT_MASK;
                样品* = db_value_global;
                        newBuf.putShort（（短）（样品放; USHORT_MASK））;
                }

                数据= newBuf.array（）;

                os.write（数据）;
 

解决方案

据我所知，你不希望任何的自动调整，从UI只能手动。有没有内置的功能，这在Android中，相反，你必须手动修改数据。

假设你使用<一个href="http://developer.android.com/reference/android/media/AudioRecord.html#read(short[],%20int,%20int)">read （短[] audioData，INT offsetInShorts，INT sizeInShorts）用于读取数据流。所以，你应该做的是这样的：

 浮动收益= getGain（）; //取自UI控件，也许在范围从0.0到2.0
INT numRead =读（audioData，0，大小）;
如果（numRead大于0）{
    的for（int i = 0; I＆LT; numRead ++ I）
         audioData [I] =（短期）Math.min（（INT）（audioData [我] *增益），（INT）Short.MAX_VALUE）;
}
 

Math.min 用于prevent溢出，如果获得大于1。

i am working on a voice recording app. in app i have a Seekbar to change input voice gain. i have searched a lot but could not found any way to adjust input voice gain.

i am using AudioRecord class to record voice.

 recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
            RECORDER_SAMPLERATE, RECORDER_CHANNELS,
            RECORDER_AUDIO_ENCODING, bufferSize);

    recorder.startRecording();

i have seen an app also in play store which are using this functionality.

https://play.google.com/store/apps/details?id=com.grace.microphone

Thanks

Edit

i have done it using

final int USHORT_MASK = (1 << 16) - 1;

final ByteBuffer buf = ByteBuffer.wrap(data).order(
                        ByteOrder.LITTLE_ENDIAN);
final ByteBuffer newBuf = ByteBuffer.allocate(
                        data.length).order(ByteOrder.LITTLE_ENDIAN);

int sample;
        while (buf.hasRemaining()) {
                sample = (int) buf.getShort() & USHORT_MASK;
                sample *= db_value_global;
                        newBuf.putShort((short) (sample & USHORT_MASK));
                }

                data = newBuf.array();

                os.write(data);

解决方案

As I understand you don't want any automatic adjustments, only manual from the UI. There is no built-in functionality for this in Android, instead you have to modify your data manually.

Suppose you use read (short[] audioData, int offsetInShorts, int sizeInShorts) for reading the stream. So you should just do something like this:

float gain = getGain(); // taken from the UI control, perhaps in range from 0.0 to 2.0
int numRead = read(audioData, 0, SIZE);
if (numRead > 0) {
    for (int i = 0; i < numRead; ++i)
         audioData[i] = (short)Math.min((int)(audioData[i] * gain), (int)Short.MAX_VALUE);
}

Math.min is used to prevent overflow if gain is greater than 1.

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