Allow customization of buffer size

This allows for faster channel changes, assuming your wifi
is up to it.

Author: kiall

app/src/main/java/ie/macinnes/tvheadend/Constants.java

@@ -35,6 +35,7 @@ public class Constants {
     public static final String KEY_HTSP_STREAM_PROFILE = "htsp_stream_profile";
 
     // Audio and Video Preferences Keys and Values
+    public static final String KEY_BUFFER_PLAYBACK_MS = "buffer_playback_ms";
     public static final String KEY_AUDIO_PASSTHROUGH_DECODER_ENABLED = "audio_passthrough_decodeder_enabled";
     public static final String KEY_FFMPEG_AUDIO_ENABLED = "ffmpeg_audio_enabled";
     public static final String KEY_CAPTIONS_APPLY_EMBEDDED_STYLES = "captions_apply_embedded_styles";

app/src/main/java/ie/macinnes/tvheadend/player/Player.java

@@ -51,6 +51,7 @@
 import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.ui.SubtitleView;
 import com.google.android.exoplayer2.upstream.DataSource;
+import com.google.android.exoplayer2.upstream.DefaultAllocator;
 import com.google.android.exoplayer2.util.MimeTypes;
 
 import java.util.ArrayList;
@@ -198,7 +199,7 @@ private void buildExoPlayer() {
 
         mTrackSelector = new TvheadendTrackSelector(trackSelectionFactory);
 
-        LoadControl loadControl = new DefaultLoadControl();
+        LoadControl loadControl = buildLoadControl();
 
         int extensionRendererMode = SimpleExoPlayer.EXTENSION_RENDERER_MODE_PREFER;
 
@@ -229,6 +230,31 @@ private void buildExoPlayer() {
         mExtractorsFactory = new HtspExtractor.Factory(mContext);
     }
 
+    private LoadControl buildLoadControl() {
+        SharedPreferences sharedPreferences = mContext.getSharedPreferences(
+                Constants.PREFERENCE_TVHEADEND, Context.MODE_PRIVATE);
+
+        TrackSelection.Factory trackSelectionFactory =
+                new AdaptiveTrackSelection.Factory(null);
+
+        mTrackSelector = new TvheadendTrackSelector(trackSelectionFactory);
+
+        int bufferForPlaybackMs = Integer.parseInt(
+                sharedPreferences.getString(
+                        Constants.KEY_BUFFER_PLAYBACK_MS,
+                        mContext.getResources().getString(R.string.pref_default_buffer_playback_ms)
+                )
+        );
+
+        return new DefaultLoadControl(
+                new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE),
+                DefaultLoadControl.DEFAULT_MIN_BUFFER_MS,
+                DefaultLoadControl.DEFAULT_MAX_BUFFER_MS,
+                bufferForPlaybackMs,
+                DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS
+        );
+    }
+
     private void buildHtspMediaSource(Uri channelUri) {
         // This is the MediaSource representing the media to be played.
         mMediaSource = new ExtractorMediaSource(channelUri,

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

@@ -20,6 +20,7 @@
     <dimen name="subtitle_minimum_font_size">13sp</dimen>
 
     <!-- Default Preference values -->
+    <string name="pref_default_buffer_playback_ms">500</string>
     <bool name="pref_default_audio_passthrough_decodeder_enabled">false</bool>
     <bool name="pref_default_audio_ffmpeg_audio_enabled">true</bool>
     <bool name="pref_default_shield_workaround_enabled">true</bool>

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

@@ -35,4 +35,28 @@
         <item>604800</item>
         <item>691200</item>
     </string-array>
+
+    <string-array name="buffer_playback_ms_names">
+        <item>No Buffer</item>
+        <item>0.5 Seconds</item>
+        <item>1 Second</item>
+        <item>1.5 Seconds</item>
+        <item>2 Seconds</item>
+        <item>2.5 Seconds</item>
+        <item>3 Seconds</item>
+        <item>4 Seconds</item>
+        <item>5 Seconds</item>
+    </string-array>
+
+    <string-array name="buffer_playback_ms_values">
+        <item>0</item>
+        <item>500</item>
+        <item>1000</item>
+        <item>1500</item>
+        <item>2000</item>
+        <item>2500</item>
+        <item>3000</item>
+        <item>4000</item>
+        <item>5000</item>
+    </string-array>
 </resources>

app/src/main/res/xml/preferences.xml

@@ -20,6 +20,15 @@
     android:title="TVHeadend Settings">
 
     <PreferenceCategory android:title="Audio and Video">
+        <ListPreference
+            android:key="buffer_playback_ms"
+            android:title="Buffer Duration"
+            android:dialogTitle="Buffer Seconds"
+            android:entries="@array/buffer_playback_ms_names"
+            android:entryValues="@array/buffer_playback_ms_values"
+            android:defaultValue="@string/pref_default_buffer_playback_ms"
+            android:summary="How many seconds to buffer before starting playback"/>
+
         <CheckBoxPreference
             android:key="audio_passthrough_decodeder_enabled"
             android:title="Enable Audio Passthrough"