我在资源文件夹中有两个 PCM 声音文件。我使用了输入流并将它们转换为字节数组。
然后我通过归一化和添加music1和music2来处理它们并输出到字节数组输出。最后,放置输出数组并将其提供给 AudioTrack。
显然,我什么也没听到,而且有什么地方不对劲。
private void mixSound() throws IOException {
InputStream in1=getResources().openRawResource(R.raw.cheerapp2);
InputStream in2=getResources().openRawResource(R.raw.buzzer2);
byte[] music1 = null;
music1= new byte[in1.available()];
music1=convertStreamToByteArray(in1);
in1.close();
byte[] music2 = null;
music2= new byte[in2.available()];
music2=convertStreamToByteArray(in2);
in2.close();
byte[] output = new byte[music1.length];
audioTrack.play();
for(int i=0; i < output.length; i++){
float samplef1 = music1[i] / 128.0f; // 2^7=128
float samplef2 = music2[i] / 128.0f;
float mixed = samplef1 + samplef2;
// reduce the volume a bit:
mixed *= 0.8;
// hard clipping
if (mixed > 1.0f) mixed = 1.0f;
if (mixed < -1.0f) mixed = -1.0f;
byte outputSample = (byte)(mixed * 128.0f);
output[i] = outputSample;
audioTrack.write(output, 0, i);
} //for loop
public static byte[] convertStreamToByteArray(InputStream is) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buff = new byte[10240];
int i = Integer.MAX_VALUE;
while ((i = is.read(buff, 0, buff.length)) > 0) {
baos.write(buff, 0, i);
}
return baos.toByteArray(); // be sure to close InputStream in calling function
}