Support for voice optimised codecs

Support for voice optimised codecs

Author: codewithtamim

README.md

@@ -6,10 +6,16 @@
 
 #### **ConvertIt** is an ad free audio/video converter and metadata editor app built using kotlin & compose and powered by ffmpeg and taglib
 
+<<<<<<< Updated upstream
 
 #### Features
 - **Multiple Formats** : **FLAC, MP3, WAV, AAC, OGG, M4A, AIFF, OPUS, WMA, MKA, SPX**, and more.
 - **Bitrate Options** : Choose from bitrates such as **64k, 96k, 128k, 192k, 256k, 320k, 512k, 768k, and 1024k** for output quality.
+=======
+## Features
+- **Multiple Formats** : **FLAC, MP3, WAV, AAC, OGG, M4A, AIFF, OPUS, WMA, MKA, SPX, AMR WB**, and more.
+- **Bitrate Options** : Choose from bitrates such as **9k, 16k, 24k, 32k, 48k, 64k, 96k, 128k, 192k, 256k, 320k, 512k, 768k, and 1024k** for output quality.
+>>>>>>> Stashed changes
 - **Modern Design** : Uses MaterialYou(aka Material3).
 - **Ad-Free** : Completely free and no annoying Ads.
 - **User-Friendly-UI** : The UI and Conversion flow is so simple that everyone can figure out with nearly zero effort.

app/src/main/java/com/nasahacker/convertit/data/repository/AudioConverterRepositoryImpl.kt

@@ -134,19 +134,16 @@ class AudioConverterRepositoryImpl
 
                         val mediaDuration = getAudioDuration(tempFile.absolutePath)
 
+                        val ffmpegArgs = buildFFmpegArgs(
+                            tempFile.absolutePath,
+                            outputFilePath,
+                            outputFormat,
+                            bitrate,
+                            playbackSpeed
+                        )
+                        
                         FFmpegKit.executeWithArgumentsAsync(
-                            arrayOf(
-                                "-y",
-                                "-i",
-                                tempFile.absolutePath,
-                                "-c:a",
-                                AudioCodec.fromFormat(outputFormat).codec,
-                                "-b:a",
-                                bitrate.bitrate,
-                                "-filter:a",
-                                "atempo=$playbackSpeed",
-                                outputFilePath,
-                            ),
+                            ffmpegArgs,
                             { session ->
                                 tempFile.delete()
 
@@ -195,6 +192,64 @@ class AudioConverterRepositoryImpl
             }
         }
 
+        private fun buildFFmpegArgs(
+            inputPath: String,
+            outputPath: String,
+            outputFormat: AudioFormat,
+            bitrate: AudioBitrate,
+            playbackSpeed: String
+        ): Array<String> {
+            Log.d(TAG, "Building FFmpeg args for format: ${outputFormat.extension}, bitrate: ${bitrate.bitrate}")
+            return when (outputFormat) {
+                AudioFormat.AMR_WB -> {
+                    arrayOf(
+                        "-y",
+                        "-i", inputPath,
+                        "-ar", "16000",           
+                        "-ac", "1",             
+                        "-c:a", AudioCodec.fromFormat(outputFormat).codec,
+                        "-b:a", bitrate.bitrate,
+                        "-filter:a", "atempo=$playbackSpeed",
+                        outputPath
+                    )
+                }
+                AudioFormat.OPUS -> {
+
+                    if (bitrate.bitrate.replace("k", "").toIntOrNull()?.let { it <= 48 } == true) {
+                        arrayOf(
+                            "-y",
+                            "-i", inputPath,
+                            "-c:a", AudioCodec.fromFormat(outputFormat).codec,
+                            "-b:a", bitrate.bitrate,
+                            "-application", "voip",   
+                            "-filter:a", "atempo=$playbackSpeed",
+                            outputPath
+                        )
+                    } else {
+                       
+                        arrayOf(
+                            "-y",
+                            "-i", inputPath,
+                            "-c:a", AudioCodec.fromFormat(outputFormat).codec,
+                            "-b:a", bitrate.bitrate,
+                            "-filter:a", "atempo=$playbackSpeed",
+                            outputPath
+                        )
+                    }
+                }
+                else -> {
+                    arrayOf(
+                        "-y",
+                        "-i", inputPath,
+                        "-c:a", AudioCodec.fromFormat(outputFormat).codec,
+                        "-b:a", bitrate.bitrate,
+                        "-filter:a", "atempo=$playbackSpeed",
+                        outputPath
+                    )
+                }
+            }
+        }
+
         private fun getAudioDuration(filePath: String): Long =
             try {
                 val session = FFprobeKit.getMediaInformation(filePath)

app/src/main/java/com/nasahacker/convertit/domain/model/AudioBitrate.kt

@@ -30,6 +30,14 @@ package com.nasahacker.convertit.domain.model
 enum class AudioBitrate(
     val bitrate: String,
 ) {
+    // voice optimized ones
+    BITRATE_9K("9k"),       
+    BITRATE_16K("16k"),     
+    BITRATE_24K("24k"),      
+    BITRATE_32K("32k"),     
+    BITRATE_48K("48k"),      
+    
+    // other standard
     BITRATE_64K("64k"),
     BITRATE_96K("96k"),
     BITRATE_128K("128k"),

app/src/main/java/com/nasahacker/convertit/domain/model/AudioCodec.kt

@@ -41,6 +41,7 @@ enum class AudioCodec(
     WMA("wmav2"),
     MKA("libvorbis"),
     SPX("libspeex"),
+    AMR_WB("amr_wb"),
     ;
 
     companion object {
@@ -57,6 +58,7 @@ enum class AudioCodec(
                 AudioFormat.MKA -> MKA
                 AudioFormat.SPX -> SPX
                 AudioFormat.FLAC -> FLAC
+                AudioFormat.AMR_WB -> AMR_WB
             }
     }
 }

app/src/main/java/com/nasahacker/convertit/domain/model/AudioFormat.kt

@@ -41,6 +41,7 @@ enum class AudioFormat(
     WMA(".wma"),
     MKA(".mka"),
     SPX(".spx"),
+    AMR_WB(".amr"),
     ;
 
     companion object {

app/src/main/res/values/arrays.xml

@@ -1,6 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string-array name="bitrates_array">
+        <item>9k</item>
+        <item>16k</item>
+        <item>24k</item>
+        <item>32k</item>
+        <item>48k</item>
         <item>64k</item>
         <item>96k</item>
         <item>128k</item>
@@ -21,6 +26,7 @@
         <item>.wma</item>
         <item>.mka</item>
         <item>.spx</item>
+        <item>.amr</item>
     </string-array>
 
 
@@ -63,6 +69,10 @@
     </string-array>
 
     <string-array name="bitrates_opus">
+        <item>16k</item>
+        <item>24k</item>
+        <item>32k</item>
+        <item>48k</item>
         <item>64k</item>
         <item>96k</item>
         <item>128k</item>
@@ -99,4 +109,10 @@
         <item>192k</item>
     </string-array>
 
+    <string-array name="bitrates_amr">
+        <item>9k</item>
+        <item>16k</item>
+        <item>24k</item>
+    </string-array>
+
 </resources>