在android中混合音频
我试着点击这个链接: 但在混合音频文件后,SD卡上的文件(mixed.wav)无法播放,我不知道为什么。 你能帮助我吗?。非常感谢 这是我的代码: 公共类MainActivity扩展了活动{在android中混合音频,android,Android,我试着点击这个链接: 但在混合音频文件后,SD卡上的文件(mixed.wav)无法播放,我不知道为什么。 你能帮助我吗?。非常感谢 这是我的代码: 公共类MainActivity扩展了活动{ public static final int FREQUENCY = 44100; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); s
public static final int FREQUENCY = 44100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
mixSound();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void mixSound() throws IOException {
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT, 44100, AudioTrack.MODE_STREAM);
InputStream in1 = getResources().openRawResource(R.raw.media_b);
InputStream in2 = getResources().openRawResource(R.raw.media_c);
byte[] arrayMusic1 = null;
arrayMusic1 = new byte[in1.available()];
arrayMusic1 = createMusicArray(in1);
in1.close();
byte[] arrayMusic2 = null;
arrayMusic2 = new byte[in2.available()];
arrayMusic2 = createMusicArray(in2);
in2.close();
byte[] output = new byte[arrayMusic1.length];
audioTrack.play();
for (int i = 0; i < output.length; i++) {
float samplef1 = arrayMusic1[i] / 128.0f;
float samplef2 = arrayMusic2[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, output.length);
convertByteToFile(output);
}
public static byte[] createMusicArray(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
}
public static void convertByteToFile(byte[] fileBytes) throws FileNotFoundException {
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(Environment.getExternalStorageDirectory().getPath()+"/mixed.wav"));
try {
bos.write(fileBytes);
bos.flush();
bos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
公共静态最终整数频率=44100;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
试一试{
混音();
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
}
私有void mixSound()引发IOException{
AudioTrack AudioTrack=新的AudioTrack(AudioManager.STREAM\u MUSIC,44100,AudioFormat.CHANNEL\u OUT\u立体声,AudioFormat.ENCODING\u PCM\u 16位,44100,AudioTrack.MODE\u STREAM);
InputStreamin1=getResources().openRawResource(R.raw.media_b);
InputStream in2=getResources().openRawResource(R.raw.media_c);
字节[]arrayMusic1=null;
arrayMusic1=新字节[in1.available()];
arrayMusic1=createMusicArray(in1);
in1.close();
字节[]arrayMusic2=null;
arrayMusic2=新字节[in2.available()];
arrayMusic2=createMusicArray(in2);
in2.close();
字节[]输出=新字节[arrayMusic1.length];
音轨播放();
for(int i=0;i1.0f)混合=1.0f;
如果(混合<-1.0f)混合=-1.0f;
字节输出样本=(字节)(混合*128.0f);
输出[i]=输出样本;
}
audioTrack.write(输出,0,输出,长度);
convertByteToFile(输出);
}
公共静态字节[]createMusicArray(InputStream is)引发IOException{
ByteArrayOutputStream bas=新的ByteArrayOutputStream();
字节[]buff=新字节[10240];
int i=整数的最大值;
而((i=is.read(buff,0,buff.length))>0){
写入(buff,0,i);
}
返回baos.toByteArray();//确保在调用函数时关闭InputStream
}
公共静态void convertbyteofile(byte[]fileBytes)引发FileNotFoundException{
BufferedOutputStream bos=新的BufferedOutputStream(新文件输出流(Environment.getExternalStorageDirectory().getPath()+“/mixed.wav”);
试一试{
写入(文件字节);
bos.flush();
bos.close();
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
}
}您输出的只是PCM数据。有效的WAV文件还需要一个标头:
Offset Size Name Description
------------------------------------------------------------------------
0 4 ChunkID Contains the letters "RIFF" in ASCII form
(0x52494646 big-endian form).
4 4 ChunkSize 36 + SubChunk2Size, or more precisely:
4 + (8 + SubChunk1Size) + (8 + SubChunk2Size)
This is the size of the rest of the chunk
following this number. This is the size of the
entire file in bytes minus 8 bytes for the
two fields not included in this count:
ChunkID and ChunkSize.
8 4 Format Contains the letters "WAVE"
(0x57415645 big-endian form).
12 4 Subchunk1ID Contains the letters "fmt "
(0x666d7420 big-endian form).
16 4 Subchunk1Size 16 for PCM. This is the size of the
rest of the Subchunk which follows this number.
20 2 AudioFormat PCM = 1 (i.e. Linear quantization)
Values other than 1 indicate some
form of compression.
22 2 NumChannels Mono = 1, Stereo = 2, etc.
24 4 SampleRate 8000, 44100, etc.
28 4 ByteRate == SampleRate * NumChannels * BitsPerSample/8
32 2 BlockAlign == NumChannels * BitsPerSample/8
The number of bytes for one sample including
all channels. I wonder what happens when
this number isn't an integer?
34 2 BitsPerSample 8 bits = 8, 16 bits = 16, etc.
2 ExtraParamSize if PCM, then doesn't exist
X ExtraParams space for extra parameters
36 4 Subchunk2ID Contains the letters "data"
(0x64617461 big-endian form).
40 4 Subchunk2Size == NumSamples * NumChannels * BitsPerSample/8
This is the number of bytes in the data.
You can also think of this as the size
of the read of the subchunk following this
number.
在此之后,您将写入PCM数据
()。怎么修,我不知道怎么修。你能帮助我吗?非常感谢:)您编写了标题中指定的所有字段。首先是字符串
RIFF
,然后是包含音频数据36+大小的32位值,然后是字符串WAVE
,依此类推。非常感谢。我的成功好坏参半。但混合了带噪波的.wav文件。如何修复它,消除白噪声。如何处理wav字节数组。你能帮我吗?你应该在页眉后立即写入PCM数据。您可以通过将PCM数据转储到一个没有任何头的文件中,然后将其作为原始PCM数据导入您的PC上的Audacity,来再次检查您的PCM数据是否正常。在我切换到short[]后,它工作得非常糟糕:(我不知道我错在哪里)。