最近做一个声音文件,对方说是声音太小。找了个软件,也没看到哪里
能够调整音量。怎么办?咱是程序员,写个程序吧。
试了一下,其实原来的声音不小,只是设备限制,所以播放声音小。于
是吾将声音变小,效果就出来了。
放这里,供需要的程序员试试:
private short getShort(byte[] data, int start)
{
return (short)((data[start] & 0xFF) | (data[start+1] << 8));
}
short SHRT_MAX = (short) 0x7F00;
short SHRT_MIN = (short)-0x7F00;
//调节PCM数据音量
int amplifyPCMData(byte[] pData, int nLen, byte[] data2, int nBitsPerSample, float multiple)
{
int nCur = 0;
if (16 == nBitsPerSample)
{
while (nCur < nLen)
{
short volum = getShort(pData, nCur);
Log.d(TAG, "volum="+volum);
volum = (short)(volum * multiple);
if (volum < SHRT_MIN)
{
volum = SHRT_MIN;
}
else if (volum > SHRT_MAX)//爆音的处理
{
volum = SHRT_MAX;
}
data2[nCur] = (byte)( volum & 0xFF);
data2[nCur+1] = (byte)((volum >> 8) & 0xFF);
nCur += 2;
}
}
/*else if (8 == nBitsPerSample)
{
while (nCur < nLen)
{
BYTE* volum = pData + nCur;
*volum = (*volum) * multiple;
if (*volum > 255)//爆音的处理
{
*volum = 255;
}
*pData = *volum ;
nCur ++;
}
} */
return 0;
}