音频编码方法改为采样率、声道传参形式

app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.java

@@ -165,7 +165,11 @@ public class AudioHandleActivity extends AppCompatActivity implements View.OnCli
                 //可编码成WAV、AAC。如果需要编码成MP3、AMR，ffmpeg需要重新编译，把MP3、AMR库enable
                 String pcmFile = PATH + File.separator + "audio.pcm";
                 String wavFile = PATH + File.separator + "output.wav";
-                commandLine = FFmpegUtil.encodeAudio(pcmFile, wavFile);
+                //pcm数据的采样率，一般采样率为8000、16000、44100
+                int sampleRate = 8000;
+                //pcm数据的声道，单声道为1，立体声道为2
+                int channel = 1;
+                commandLine = FFmpegUtil.encodeAudio(pcmFile, wavFile, sampleRate, channel);
                 break;
             default:
                 break;

app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java

@@ -215,12 +215,13 @@ public class FFmpegUtil {
      * 音频编码
      * @param srcFile 源文件pcm裸流
      * @param targetFile 编码后目标文件
+     * @param sampleRate 采样率
+     * @param channel 声道:单声道为1/立体声道为2
      * @return 音频编码的命令行
      */
-    public static  String[] encodeAudio(String srcFile, String targetFile){
-        String combineVideo = "ffmpeg -f s16le -ar 8000 -ac 1 -i %s %s";
-        combineVideo = String.format(combineVideo, srcFile, targetFile);
-        combineVideo = combineVideo.replace("#", "%");
+    public static  String[] encodeAudio(String srcFile, String targetFile, int sampleRate, int channel){
+        String combineVideo = "ffmpeg -f s16le -ar %d -ac %d -i %s %s";
+        combineVideo = String.format(combineVideo, sampleRate, channel, srcFile, targetFile);
         return combineVideo.split(" ");
     }