Issue #1. Fixed bug with audio pitch

Author: lincollincol

app/build.gradle

@@ -28,5 +28,6 @@ dependencies {
 
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'androidx.appcompat:appcompat:1.2.0'
+//    implementation 'com.github.lincollincol:AudioTool:1.0'
 
 }

app/src/main/java/linc/com/audiotool/MainActivity.java

@@ -7,12 +7,7 @@
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.app.ActivityCompat;
 
-import java.io.File;
-import java.util.Arrays;
-import java.util.List;
-
 import linc.com.library.AudioTool;
-import linc.com.library.callback.OnListComplete;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -29,8 +24,11 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
 
         try {
             AudioTool.getInstance(this)
-                    .withAudio(new File("/storage/emulated/0/Music/Linc - AudioTool.mp3"))
-                    /* calls */
+                    .withAudio("/storage/emulated/0/Music/level.mp3")
+//                    .changeAudioPitch(44100, -0.86883157f, -0.8699582800000001f, null)
+//                    .changeAudioPitch(44100, -2.86883157f, null)
+//                    .changeAudioPitch(44100, -2.86883157f, Pitch.DOWN, null)
+                    .saveCurrentTo("/storage/emulated/0/Music/level_pitch.mp3")
                     .release();
         } catch (Exception e) {
             e.printStackTrace();

library/src/main/java/linc/com/library/AudioTool.java

@@ -23,6 +23,7 @@
 import linc.com.library.callback.OnListComplete;
 import linc.com.library.types.Duration;
 import linc.com.library.types.Echo;
+import linc.com.library.types.Pitch;
 
 import static linc.com.library.Constant.AUDIO_TOOL_LOCAL_EFFECT_REVERB;
 import static linc.com.library.Constant.AUDIO_TOOL_LOCAL_JOIN_FILE;
@@ -206,27 +207,51 @@ public AudioTool changeAudioSpeed(float xSpeed, @Nullable OnFileComplete onCompl
 
     /**
      * @param sampleRate         audio sample rate
-     * @param pitch              audio pitch value
-     * @param tempo              audio speed value
+     * @param deltaRate          audio custom rate value
+     * @param deltaTempo         audio custom tempo value
      * @param onCompleteCallback lambda with result audio
      */
-    public AudioTool changeAudioPitch(int sampleRate, float pitch, float tempo, @Nullable OnFileComplete onCompleteCallback) throws IOException {
-        tempo = Limiter.limit(0.5f, 2, tempo);
+    public AudioTool changeAudioPitch(int sampleRate, float deltaRate, float deltaTempo, @Nullable OnFileComplete onCompleteCallback) throws IOException {
+        deltaTempo = Limiter.limit(-12f, 12f, deltaTempo);
+        deltaRate = Limiter.limit(-12f, 12f, deltaRate);
+
         String command = String.format(Locale.US,
-                "-y -i %s -filter_complex asetrate=%d*%f^(-10/12),atempo=%f^(-10/12)",
-                audio.getPath(), sampleRate, pitch, tempo
+                "-y -i %s -filter_complex asetrate=%d*2^(%f/12),atempo=1/2^(%f/12)",
+                audio.getPath(), sampleRate, deltaRate, deltaTempo
         );
         FFmpegExecutor.executeCommandWithBuffer(command, audio);
         onResultFile(onCompleteCallback);
         return this;
     }
 
     /**
-     * @param bass               audio bass
-     * @param width              audio bass width
-     * @param frequency          audio frequency
+     * @param sampleRate         audio sample rate
+     * @param pitch              audio semitone value
+     * @param onCompleteCallback lambda with result audio
+     */
+    public AudioTool changeAudioPitch(int sampleRate, float pitch, @Nullable OnFileComplete onCompleteCallback) throws IOException {
+        changeAudioPitch(sampleRate, pitch, pitch, onCompleteCallback);
+        return this;
+    }
+
+    /**
+     * @param sampleRate         audio sample rate
+     * @param pitchValue         audio semitone value
+     * @param pitch              pitch type: UP or DOWN
      * @param onCompleteCallback lambda with result audio
      */
+    public AudioTool changeAudioPitch(int sampleRate, float pitchValue, Pitch pitch, @Nullable OnFileComplete onCompleteCallback) throws IOException {
+        pitchValue = pitch == Pitch.UP ? Math.abs(pitchValue) : -Math.abs(pitchValue);
+        changeAudioPitch(sampleRate, pitchValue, pitchValue, onCompleteCallback);
+        return this;
+    }
+
+        /**
+         * @param bass               audio bass
+         * @param width              audio bass width
+         * @param frequency          audio frequency
+         * @param onCompleteCallback lambda with result audio
+         */
     public AudioTool changeAudioBass(float bass, float width, int frequency, @Nullable OnFileComplete onCompleteCallback) throws IOException {
         bass = Limiter.limit(-20f, 20f, bass);
         width = Limiter.limit(0f, 1f, width);

library/src/main/java/linc/com/library/types/Pitch.java

@@ -0,0 +1,5 @@
+package linc.com.library.types;
+
+public enum Pitch {
+    UP, DOWN
+}