Add an option for frame skip

Close #8383

NEWS

@@ -9,6 +9,7 @@ Main Application:
  * Fix opening MRLs and video streaming
  * Fix many crashes and warnings
  * New equalizer
+ * Option for frame skip to improve performance
 
 
 Changes between 0.1.1 and 0.1.2:

vlc-android/jni/libvlcjni.c

@@ -216,6 +216,9 @@ void Java_org_videolan_libvlc_LibVLC_nativeInit(JNIEnv *env, jobject thiz)
     methodId = (*env)->GetMethodID(env, cls, "timeStretchingEnabled", "()Z");
     bool enable_time_stretch = (*env)->CallBooleanMethod(env, thiz, methodId);
 
+    methodId = (*env)->GetMethodID(env, cls, "frameSkipEnabled", "()Z");
+    bool enable_frame_skip = (*env)->CallBooleanMethod(env, thiz, methodId);
+
     methodId = (*env)->GetMethodID(env, cls, "getDeblocking", "()I");
     int deblocking = (*env)->CallIntMethod(env, thiz, methodId);
     char deblockstr[2] = "3";
@@ -252,6 +255,8 @@ void Java_org_videolan_libvlc_LibVLC_nativeInit(JNIEnv *env, jobject thiz)
         "--subsdec-encoding", subsencodingstr,
         enable_time_stretch ? "--audio-time-stretch" : "--no-audio-time-stretch",
         "--avcodec-skiploopfilter", deblockstr,
+        "--avcodec-skip-frame", enable_frame_skip ? "4" : "0",
+        "--avcodec-skip-idct", enable_frame_skip ? "4" : "0",
         use_opensles ? "--aout=opensles" : "--aout=android_audiotrack",
         "--androidsurface-chroma", chromastr != NULL && chromastr[0] != 0 ? chromastr : "RV32",
     };

vlc-android/res/values-fr/strings.xml

@@ -166,6 +166,8 @@
     <string name="enable_iomx_summary">Active l\'accélération matérielle pour améliorer les performances. Ne fonctionne pas sur tous les appareils.</string>
     <string name="enable_time_stretching_audio">Correction audio</string>
     <string name="enable_time_stretching_audio_summary">Active la correction audio en lecture accélérée ou ralentie. Nécessite un appareil puissant</string>
+    <string name="enable_frame_skip">Activer le sautage des trames</string>
+    <string name="enable_frame_skip_summary">Accélérer le décodage pour améliore les performances, mais diminue la qualité</string>
     <string name="deblocking">Filtre de déblocage</string>
     <string name="deblocking_summary">Améliore la qualité mais nécessite un appareil puissant</string>
     <string name="deblocking_always">Déblocage max (plus lente)</string>

vlc-android/res/values/strings.xml

@@ -192,6 +192,8 @@
     <string name="enable_iomx_summary">Improves performance, but may not work with all devices.</string>
     <string name="enable_time_stretching_audio">Time-stretching audio</string>
     <string name="enable_time_stretching_audio_summary">Speed up and slow down audio without changing the pitch (requires a fast device).</string>
+    <string name="enable_frame_skip">Enable frame skip</string>
+    <string name="enable_frame_skip_summary">Speed up decoding but could lower video quality.</string>
     <string name="deblocking">Deblocking filter settings</string>
     <string name="deblocking_summary">Change the deblocking filter settings. Could improve video quality. Advanced users only.</string>
     <string name="deblocking_always">Full deblocking (slowest)</string>

vlc-android/res/xml/preferences.xml

@@ -52,6 +52,11 @@
             android:key="deblocking"
             android:title="@string/deblocking"
             android:summary="@string/deblocking_summary" />
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="enable_frame_skip"
+            android:summary="@string/enable_frame_skip_summary"
+            android:title="@string/enable_frame_skip" />
         <CheckBoxPreference
             android:key="enable_iomx"
             android:summary="@string/enable_iomx_summary"

vlc-android/src/org/videolan/libvlc/LibVLC.java

@@ -62,6 +62,7 @@ public class LibVLC {
     private String chroma = "";
     private boolean verboseMode = true;
     private float[] equalizer = null;
+    private boolean frameSkip = false;
 
     /** Check in libVLC already initialized otherwise crash */
     private boolean mIsInitialized = false;
@@ -260,6 +261,14 @@ public class LibVLC {
         setNativeEqualizer(this.equalizer);
     }
 
+    public boolean frameSkipEnabled() {
+        return frameSkip;
+    }
+
+    public void setFrameSkip(boolean frameskip) {
+        this.frameSkip = frameskip;
+    }
+
     /**
      * Initialize the libVLC class
      */

vlc-android/src/org/videolan/vlc/Util.java

@@ -117,6 +117,7 @@ public class Util {
         instance.setIomx(pref.getBoolean("enable_iomx", false));
         instance.setSubtitlesEncoding(pref.getString("subtitles_text_encoding", ""));
         instance.setTimeStretching(pref.getBoolean("enable_time_stretching_audio", false));
+        instance.setFrameSkip(pref.getBoolean("enable_frame_skip", false));
         instance.setChroma(pref.getString("chroma_format", ""));
         instance.setVerboseMode(pref.getBoolean("enable_verbose_mode", true));
 

vlc-android/src/org/videolan/vlc/gui/PreferencesActivity.java

@@ -203,6 +203,7 @@ public class PreferencesActivity extends PreferenceActivity implements OnSharedP
         if(key.equalsIgnoreCase("enable_iomx")
                 || key.equalsIgnoreCase("subtitles_text_encoding")
                 || key.equalsIgnoreCase("aout")
+                || key.equalsIgnoreCase("enable_frame_skip")
                 || key.equalsIgnoreCase("enable_time_stretching_audio")
                 || key.equalsIgnoreCase("deblocking")
                 || key.equalsIgnoreCase("chroma_format")