cancel the running task

cancel the running task

app/src/main/cpp/ffmpeg/ffmpeg.c

@@ -159,6 +159,7 @@ int         nb_output_files   = 0;
 FilterGraph **filtergraphs;
 int        nb_filtergraphs;
 
+int cancel_execute = 0;
 #if HAVE_TERMIOS_H
 
 /* init terminal so that we can grab keys */
@@ -4709,6 +4710,11 @@ static int transcode(void)
             break;
         }
 
+        if (cancel_execute) {
+            av_log(NULL, AV_LOG_ERROR, "cancel task by user...");
+            break;
+        }
+
         ret = transcode_step();
         if (ret < 0 && ret != AVERROR_EOF) {
             av_log(NULL, AV_LOG_ERROR, "Error while filtering: %s\n", av_err2str(ret));
@@ -4940,3 +4946,7 @@ end:
     ffmpeg_cleanup(0);
     return main_return_code;
 }
+
+void cancel_task(int cancel) {
+    cancel_execute = cancel;
+}

app/src/main/cpp/ffmpeg/ffmpeg.h

@@ -675,5 +675,6 @@ enum ProgressState {
 };
 
 void progress_callback(int position, int duration, int state);
+void cancel_task(int cancel);
 
 #endif /* FFTOOLS_FFMPEG_H */

app/src/main/cpp/ffmpeg_cmd.c

@@ -49,6 +49,10 @@ FFMPEG_FUNC(jint, handle, jobjectArray commands) {
     return result;
 }
 
+FFMPEG_FUNC(void, cancelTaskJni, jint cancel) {
+    cancel_task(cancel);
+}
+
 void log_callback(void* ptr, int level, const char* format, va_list args) {
     switch (level) {
         case AV_LOG_DEBUG:

app/src/main/java/com/frank/ffmpeg/FFmpegCmd.java

@@ -93,6 +93,10 @@ public class FFmpegCmd {
         }).start();
     }
 
+    public static void cancelTask(boolean cancel) {
+        cancelTaskJni(cancel ? 1 : 0);
+    }
+
     /**
      * Using FastStart to moov box in front of mdat box
      *
@@ -142,6 +146,8 @@ public class FFmpegCmd {
 
     private native static int handle(String[] commands);
 
+    private native static void cancelTaskJni(int cancel);
+
     private native static int fastStart(String inputFile, String outputFile);
 
     private native static String handleProbe(String[] commands);

app/src/main/java/com/frank/ffmpeg/handler/FFmpegHandler.java

@@ -73,6 +73,14 @@ public class FFmpegHandler {
         });
     }
 
+    /**
+     * cancel the running task, and exit quietly
+     * @param cancel cancel the task when flag is true
+     */
+    public void cancelExecute(boolean cancel) {
+        FFmpegCmd.cancelTask(cancel);
+    }
+
     /**
      * execute multi commands of FFmpeg
      *