blocks|key|225447|text|Android上没有支持混音(将两个音频输入流组合成一个输出流)的内置库。支持混音的Java+javax.sound库并没有移植到安卓系统上--谷歌工程师黛安·哈克伯恩在谷歌小组上发表了一个有趣的discussion，关于不把javax.sound移植到安卓系统的决定。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|225448|看起来你必须从头开始开发你自己的解决方案。关于如何将两个音频流合并为一个音频流，有几个有用的答案：|225449|Mixing+Audio+Files|225450|Audio+editing+in+Android|225451|Android+-+Mixing+multiple+static+waveforms+into+a+single+AudioTrack|225452|entityMap|0|LINK|mutability|MUTABLE|url|https://groups.google.com/forum/?fromgroups=#!topic/android-developers/VD2V7ENFrgs|1|https://stackoverflow.com/questions/2191408/mixing-audio-files|2|https://stackoverflow.com/questions/8265494/audio-editing-in-android|3|https://stackoverflow.com/questions/11820802/android-mixing-multiple-static-waveforms-into-a-single-audiotrack^0|1B|B|35|B|2Q|A|0|0|0|0|I|1|0|0|O|2|0|0|1V|3|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@$9|16|A|17|1|18]]|E|$]]|$1|F|3|G|5|6|7|19|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1A|8|@]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|J|3|K|5|6|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|L|3|M|5|6|7|1I|8|@]|D|@$9|1J|A|1K|1|1L]]|E|$]]|$1|N|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]|V|$5|Q|R|S|E|$T|W]]|X|$5|Q|R|S|E|$T|Y]]|Z|$5|Q|R|S|E|$T|10]]]]

There is no build-in library on Android that supports audio mixing (combining two audio input streams into one output stream). The Java <code>javax.sound</code> library which supports audio mixing was not ported to Android - there's an interesting <a href="https://groups.google.com/forum/?fromgroups=#!topic/android-developers/VD2V7ENFrgs" rel="noreferrer">discussion</a> on Google Groups with Google engineer Diane Hackborn about the decision to not port <code>javax.sound</code> to Android.

It looks like you have to develop your own solution from scratch. There are several helpful answers on SO on how to combine two audio streams into one:

<a href="https://stackoverflow.com/questions/2191408/mixing-audio-files">Mixing Audio Files</a>

<a href="https://stackoverflow.com/questions/8265494/audio-editing-in-android">Audio editing in Android</a>

<a href="https://stackoverflow.com/questions/11820802/android-mixing-multiple-static-waveforms-into-a-single-audiotrack">Android - Mixing multiple static waveforms into a single AudioTrack</a>

blocks|key|443584|text|听起来最难的部分是一次播放多首曲目，剩下的部分可以通过UI来完成。一个可能对你有帮助的链接是How+to+play+multiple+ogg+or+mp3+at+the+same+time..?+SoundPool的文档，它可以让你一次播放多个声音，可以在here找到。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|443585|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/9866927/how-to-play-multiple-ogg-or-mp3-at-the-same-time|1|http://developer.android.com/reference/android/media/SoundPool.html^0|1A|1F|0|3K|4|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

It sounds like the hardest part of this would be playing multiple tracks at once, and that the rest can be done with the UI. One link that might help you is <a href="https://stackoverflow.com/questions/9866927/how-to-play-multiple-ogg-or-mp3-at-the-same-time">How to play multiple ogg or mp3 at the same time..?</a> The documentation for SoundPool, which lets you play multiple sounds at once, can be found <a href="http://developer.android.com/reference/android/media/SoundPool.html" rel="nofollow noreferrer">here</a>.

blocks|key|225507|text|现在已经很晚了，但是如果有人需要，可以使用AudioMixer-android。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|225508|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/rajib010/android_audio_mixer^0|L|I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

It is late but if someone needs, <a href="https://github.com/rajib010/android_audio_mixer" rel="nofollow noreferrer">AudioMixer-android</a> can be used.

blocks|key|443634|text|File+dir;
dir+=+new+File(Environment.getExternalStorageDirectory().getAbsolutePath());
dir.mkdirs();

//Audio+Mixer+for+two+.raw+file+into+single+.wav+file...
void+AudioMixer()+{
++++File+file_play1+=+new+File(dir,+"Neww.raw");
++++int+shortSizeInBytes+=+Short.SIZE+/+Byte.SIZE;
++++int+bufferSizeInBytes+=+(int)+(file_play1.length()+/+shortSizeInBytes);
++++short[]+audioData+=+new+short[bufferSizeInBytes];

++++try+{
++++++++InputStream+inputStream+=+new+FileInputStream(file_play1);
++++++++BufferedInputStream+bufferedInputStream+=+new+BufferedInputStream(inputStream);
++++++++DataInputStream+dataInputStream+=+new+DataInputStream(bufferedInputStream);

++++++++InputStream+inputStream1+=+getResources().openRawResource(R.raw.trainss);+//Play+form+raw+folder
++++++++BufferedInputStream+bufferedInputStream1+=+new+BufferedInputStream(inputStream1);
++++++++DataInputStream+dataInputStream1+=+new+DataInputStream(bufferedInputStream1);

++++++++int+i+=+0;
++++++++while+(dataInputStream.available()+>+0+&&+dataInputStream1.available()+>+0)+{
++++++++++++audioData[i]+=+(short)+(dataInputStream.readShort()+%2B+dataInputStream1.readShort());
++++++++++++i%2B%2B;
++++++++}

++++++++dataInputStream.close();
++++++++dataInputStream1.close();
++++++++AudioTrack+audioTrack+=+new+AudioTrack(
++++++++++++++++AudioManager.STREAM_MUSIC,
++++++++++++++++11025,
++++++++++++++++AudioFormat.CHANNEL_CONFIGURATION_MONO,
++++++++++++++++AudioFormat.ENCODING_PCM_16BIT,
++++++++++++++++bufferSizeInBytes,
++++++++++++++++AudioTrack.MODE_STREAM);
++++++++audioTrack.write(audioData,+0,+bufferSizeInBytes);

++++++++//merge+two+.raw+files+in++single+.raw+file...
++++++++File+file_record+=+new+File(dir,+"testing.raw");
++++++++try+{
++++++++++++OutputStream+outputStream+=+new+FileOutputStream(file_record);
++++++++++++BufferedOutputStream+bufferedOutputStream+=+new+BufferedOutputStream(outputStream);
++++++++++++DataOutputStream+dataOutputStream+=+new+DataOutputStream(bufferedOutputStream);

++++++++++++for+(int+j+=+0;+j+<+audioData.length;+j%2B%2B)+{
++++++++++++++++dataOutputStream.writeShort(audioData[j]);
++++++++++++}
++++++++++++dataOutputStream.close();
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}

++++++++//Convert+that+.raw+(testing.raw)+file+into+.wav+(testingNew.wav)+file+
++++++++File+des+=+new+File(dir,+"testingNew.wav");
++++++++try+{
++++++++++++rawToWave(file_record,+des);
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}+catch+(FileNotFoundException+e)+{
++++++++e.printStackTrace();
++++}+catch+(IOException+e)+{
++++++++e.printStackTrace();
++++}+catch+(IllegalStateException+e)+{
++++++++e.printStackTrace();
++++}
}

//convert+.raw+file+to+.wav+File...
private+void+rawToWave(final+File+rawFile,+final+File+waveFile)+throws+IOException+{
++++byte[]+rawData+=+new+byte[(int)+rawFile.length()];
++++DataInputStream+input+=+null;
++++try+{
++++++++input+=+new+DataInputStream(new+FileInputStream(rawFile));
++++++++input.read(rawData);
++++}+finally+{
++++++++if+(input+!=+null)+{
++++++++++++input.close();
++++++++}
++++}

++++DataOutputStream+output+=+null;
++++try+{
++++++++output+=+new+DataOutputStream(new+FileOutputStream(waveFile));
++++++++//+WAVE+header
++++++++writeString(output,+"RIFF");+//+chunk+id
++++++++writeInt(output,+36+%2B+rawData.length);+//+chunk+size
++++++++writeString(output,+"WAVE");+//+format
++++++++writeString(output,+"fmt+");+//+subchunk+1+id
++++++++writeInt(output,+16);+//+subchunk+1+size
++++++++writeShort(output,+(short)+1);+//+audio+format+(1+=+PCM)
++++++++writeShort(output,+(short)+1);+//+number+of+channels
++++++++writeInt(output,+SAMPLE_RATE);+//+sample+rate
++++++++writeInt(output,+SAMPLE_RATE+*+2);+//+byte+rate
++++++++writeShort(output,+(short)+2);+//+block+align
++++++++writeShort(output,+(short)+16);+//+bits+per+sample
++++++++writeString(output,+"data");+//+subchunk+2+id
++++++++writeInt(output,+rawData.length);+//+subchunk+2+size
++++++++//+Audio+data+(conversion+big+endian+->+little+endian)
++++++++short[]+shorts+=+new+short[rawData.length+/+2];
++++++++ByteBuffer.wrap(rawData).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shorts);
++++++++ByteBuffer+bytes+=+ByteBuffer.allocate(shorts.length+*+2);
++++++++for+(short+s+:+shorts)+{
++++++++++++bytes.putShort(s);
++++++++}
++++++++output.write(bytes.array());
++++}+finally+{
++++++++if+(output+!=+null)+{
++++++++++++output.close();
++++++++}
++++}
}

private+void+writeInt(final+DataOutputStream+output,+final+int+value)+throws+IOException+{
++++output.write(value+>>+0);
++++output.write(value+>>+8);
++++output.write(value+>>+16);
++++output.write(value+>>+24);
}

private+void+writeShort(final+DataOutputStream+output,+final+short+value)+throws+IOException+{
++++output.write(value+>>+0);
++++output.write(value+>>+8);
}

private+void+writeString(final+DataOutputStream+output,+final+String+value)+throws+IOException+{
++++for+(int+i+=+0;+i+<+value.length();+i%2B%2B)+{
++++++++output.write(value.charAt(i));
++++}
}


//playing+merged+file...
private+void+playWavFile()+{
++++MediaPlayer+recorded_audio_in_sounds+=+new+MediaPlayer();
++++String+outputFile+=+Environment.getExternalStorageDirectory().getAbsolutePath()+%2B+"/testingNew.wav";
++++try+{
++++++++if+(recorded_audio_in_sounds+!=+null)+{
++++++++++++if+(recorded_audio_in_sounds.isPlaying())+{
++++++++++++++++recorded_audio_in_sounds.pause();
++++++++++++++++recorded_audio_in_sounds.stop();
++++++++++++++++recorded_audio_in_sounds.reset();
++++++++++++++++recorded_audio_in_sounds.setDataSource(outputFile);
++++++++++++++++recorded_audio_in_sounds.prepare();
++++++++++++++++recorded_audio_in_sounds.setAudioStreamType(AudioManager.STREAM_MUSIC);
++++++++++++++++recorded_audio_in_sounds.start();
++++++++++++++++recorded_audio_in_sounds.start();
++++++++++++}+else+{
++++++++++++++++recorded_audio_in_sounds.reset();
++++++++++++++++recorded_audio_in_sounds.setDataSource(outputFile);
++++++++++++++++recorded_audio_in_sounds.prepare();
++++++++++++++++recorded_audio_in_sounds.start();
++++++++++++++++recorded_audio_in_sounds.setVolume(2.0f,+2.0f);
++++++++++++}
++++++++}
++++}+catch+(Exception+e)+{
++++++++e.printStackTrace();
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|443635|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>File dir;
dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath());
dir.mkdirs();

//Audio Mixer for two .raw file into single .wav file...
void AudioMixer() {
 File file_play1 = new File(dir, "Neww.raw");
 int shortSizeInBytes = Short.SIZE / Byte.SIZE;
 int bufferSizeInBytes = (int) (file_play1.length() / shortSizeInBytes);
 short[] audioData = new short[bufferSizeInBytes];

 try {
 InputStream inputStream = new FileInputStream(file_play1);
 BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
 DataInputStream dataInputStream = new DataInputStream(bufferedInputStream);

 InputStream inputStream1 = getResources().openRawResource(R.raw.trainss); //Play form raw folder
 BufferedInputStream bufferedInputStream1 = new BufferedInputStream(inputStream1);
 DataInputStream dataInputStream1 = new DataInputStream(bufferedInputStream1);

 int i = 0;
 while (dataInputStream.available() &gt; 0 &amp;&amp; dataInputStream1.available() &gt; 0) {
 audioData[i] = (short) (dataInputStream.readShort() + dataInputStream1.readShort());
 i++;
 }

 dataInputStream.close();
 dataInputStream1.close();
 AudioTrack audioTrack = new AudioTrack(
 AudioManager.STREAM_MUSIC,
 11025,
 AudioFormat.CHANNEL_CONFIGURATION_MONO,
 AudioFormat.ENCODING_PCM_16BIT,
 bufferSizeInBytes,
 AudioTrack.MODE_STREAM);
 audioTrack.write(audioData, 0, bufferSizeInBytes);

 //merge two .raw files in single .raw file...
 File file_record = new File(dir, "testing.raw");
 try {
 OutputStream outputStream = new FileOutputStream(file_record);
 BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
 DataOutputStream dataOutputStream = new DataOutputStream(bufferedOutputStream);

 for (int j = 0; j &lt; audioData.length; j++) {
 dataOutputStream.writeShort(audioData[j]);
 }
 dataOutputStream.close();
 } catch (IOException e) {
 e.printStackTrace();
 }

 //Convert that .raw (testing.raw) file into .wav (testingNew.wav) file 
 File des = new File(dir, "testingNew.wav");
 try {
 rawToWave(file_record, des);
 } catch (IOException e) {
 e.printStackTrace();
 }
 } catch (FileNotFoundException e) {
 e.printStackTrace();
 } catch (IOException e) {
 e.printStackTrace();
 } catch (IllegalStateException e) {
 e.printStackTrace();
 }
}

//convert .raw file to .wav File...
private void rawToWave(final File rawFile, final File waveFile) throws IOException {
 byte[] rawData = new byte[(int) rawFile.length()];
 DataInputStream input = null;
 try {
 input = new DataInputStream(new FileInputStream(rawFile));
 input.read(rawData);
 } finally {
 if (input != null) {
 input.close();
 }
 }

 DataOutputStream output = null;
 try {
 output = new DataOutputStream(new FileOutputStream(waveFile));
 // WAVE header
 writeString(output, "RIFF"); // chunk id
 writeInt(output, 36 + rawData.length); // chunk size
 writeString(output, "WAVE"); // format
 writeString(output, "fmt "); // subchunk 1 id
 writeInt(output, 16); // subchunk 1 size
 writeShort(output, (short) 1); // audio format (1 = PCM)
 writeShort(output, (short) 1); // number of channels
 writeInt(output, SAMPLE_RATE); // sample rate
 writeInt(output, SAMPLE_RATE * 2); // byte rate
 writeShort(output, (short) 2); // block align
 writeShort(output, (short) 16); // bits per sample
 writeString(output, "data"); // subchunk 2 id
 writeInt(output, rawData.length); // subchunk 2 size
 // Audio data (conversion big endian -&gt; little endian)
 short[] shorts = new short[rawData.length / 2];
 ByteBuffer.wrap(rawData).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shorts);
 ByteBuffer bytes = ByteBuffer.allocate(shorts.length * 2);
 for (short s : shorts) {
 bytes.putShort(s);
 }
 output.write(bytes.array());
 } finally {
 if (output != null) {
 output.close();
 }
 }
}

private void writeInt(final DataOutputStream output, final int value) throws IOException {
 output.write(value &gt;&gt; 0);
 output.write(value &gt;&gt; 8);
 output.write(value &gt;&gt; 16);
 output.write(value &gt;&gt; 24);
}

private void writeShort(final DataOutputStream output, final short value) throws IOException {
 output.write(value &gt;&gt; 0);
 output.write(value &gt;&gt; 8);
}

private void writeString(final DataOutputStream output, final String value) throws IOException {
 for (int i = 0; i &lt; value.length(); i++) {
 output.write(value.charAt(i));
 }
}


//playing merged file...
private void playWavFile() {
 MediaPlayer recorded_audio_in_sounds = new MediaPlayer();
 String outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/testingNew.wav";
 try {
 if (recorded_audio_in_sounds != null) {
 if (recorded_audio_in_sounds.isPlaying()) {
 recorded_audio_in_sounds.pause();
 recorded_audio_in_sounds.stop();
 recorded_audio_in_sounds.reset();
 recorded_audio_in_sounds.setDataSource(outputFile);
 recorded_audio_in_sounds.prepare();
 recorded_audio_in_sounds.setAudioStreamType(AudioManager.STREAM_MUSIC);
 recorded_audio_in_sounds.start();
 recorded_audio_in_sounds.start();
 } else {
 recorded_audio_in_sounds.reset();
 recorded_audio_in_sounds.setDataSource(outputFile);
 recorded_audio_in_sounds.prepare();
 recorded_audio_in_sounds.start();
 recorded_audio_in_sounds.setVolume(2.0f, 2.0f);
 }
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
}
</code></pre>

I want to create an audio mixer (DJ music track) kind of app which can create Dj mixer of an audio song. User can select a music song track that can be mixed with two or more separate rhythm, bass or beat tracks to create a new modified Dj music. 

I did a lot of research over this but could not find any idea or clue.

If anyone have some idea or some reference URL regarding this, please share it.

Audio song mixer in android programmatically

Android

Java

我想创建一个音频混音器(DJ音乐轨道)类的应用程序，可以创建Dj混音器的音频歌曲。用户可以选择音乐歌曲轨道，该音乐歌曲轨道可以与两个或更多单独的节奏、贝斯或节拍轨道混合以创建新的修改的Dj音乐。我对此做了很多研究，但找不到任何想法或线索。如果任何人对此有一些想法或参考网址，请分享它。

问android中的音频歌曲混音器
EN

回答 4

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问android中的音频歌曲混音器EN

回答 4

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问android中的音频歌曲混音器
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