From 90014362565dd737b84cb58439f2f79e5e511bc4 Mon Sep 17 00:00:00 2001
From: Thomas Perl <m@thp.io>
Date: Sun, 2 Feb 2014 15:44:18 +0100
Subject: [PATCH] Playback progress and position handling

---
 common/GPodderCore.qml     |  2 ++
 common/GPodderPlayback.qml | 73 ++++++++++++++++++++++++++++++++++++--
 main.py                    | 16 +++++++++
 3 files changed, 89 insertions(+), 2 deletions(-)

diff --git a/common/GPodderCore.qml b/common/GPodderCore.qml
index 7fcb7e5..1511ea9 100644
--- a/common/GPodderCore.qml
+++ b/common/GPodderCore.qml
@@ -28,6 +28,7 @@ Python {
     property bool ready: false
     signal downloading(int episode_id)
     signal downloadProgress(int episode_id, real progress)
+    signal playbackProgress(int episode_id, real progress)
     signal downloaded(int episode_id)
     signal deleted(int episode_id)
     signal isNewChanged(int episode_id, bool is_new)
@@ -41,6 +42,7 @@ Python {
 
         setHandler('downloading', py.downloading);
         setHandler('download-progress', py.downloadProgress);
+        setHandler('playback-progress', py.playbackProgress);
         setHandler('downloaded', py.downloaded);
         setHandler('deleted', py.deleted);
         setHandler('is-new-changed', py.isNewChanged);
diff --git a/common/GPodderPlayback.qml b/common/GPodderPlayback.qml
index f082c6a..f39305c 100644
--- a/common/GPodderPlayback.qml
+++ b/common/GPodderPlayback.qml
@@ -24,15 +24,84 @@ import QtMultimedia 5.0
 MediaPlayer {
     id: player
 
-    property int episode
+    property int episode: 0
     property var queue: ([])
     property bool isPlaying: playbackState == MediaPlayer.PlayingState
 
+    property bool inhibitPositionEvents: false
+    property bool seekAfterPlay: false
+    property int seekTargetSeconds: 0
+    property int lastPosition: 0
+    property int lastDuration: 0
+    property int playedFrom: 0
+
     function playbackEpisode(episode_id) {
-        player.episode = episode_id;
+        if (episode == episode_id) {
+            // If the episode is already loaded, just start playing
+            play();
+            return;
+        }
+
+        // First, make sure we stop any seeking / position update events
+        sendPositionToCore(lastPosition);
+        player.inhibitPositionEvents = true;
+        player.stop();
+
         py.call('main.play_episode', [episode_id], function (episode) {
+            // Load media / prepare and start playback
+            player.episode = episode_id;
             player.source = episode.source;
+            player.seekTargetSeconds = episode.position;
+            seekAfterPlay = true;
+
             player.play();
         });
     }
+
+    function seekAndSync(target_position) {
+        sendPositionToCore(lastPosition);
+        seek(target_position);
+        playedFrom = target_position;
+    }
+
+    onPlaybackStateChanged: {
+        if (playbackState == MediaPlayer.PlayingState) {
+            if (seekAfterPlay) {
+                // A seek was scheduled, execute now that we're playing
+                player.inhibitPositionEvents = false;
+                player.seek(seekTargetSeconds * 1000);
+                player.playedFrom = seekTargetSeconds * 1000;
+                seekAfterPlay = false;
+            } else {
+                player.playedFrom = position;
+            }
+        } else {
+            sendPositionToCore(lastPosition);
+        }
+    }
+
+    function sendPositionToCore(positionToSend) {
+        if (episode != 0 && !inhibitPositionEvents) {
+            var begin = playedFrom / 1000;
+            var end = positionToSend / 1000;
+            var duration = ((lastDuration > 0) ? lastDuration : 0) / 1000;
+            var diff = end - begin;
+
+            // Only send playback events if they are 2 seconds or longer
+            // (all other events might just be seeking events or wrong ones)
+            if (diff >= 2) {
+                py.call('main.report_playback_event', [episode, begin, end, duration]);
+            }
+        }
+    }
+
+    onPositionChanged: {
+        if (isPlaying && !inhibitPositionEvents) {
+            lastPosition = position;
+            lastDuration = duration;
+
+            // Directly update the playback progress in the episode list
+            py.playbackProgress(episode, position / duration);
+        }
+    }
 }
diff --git a/main.py b/main.py
index cb2ea8e..fb7126d 100644
--- a/main.py
+++ b/main.py
@@ -93,6 +93,12 @@ class gPotherSide:
             return ''
         return 'file://' + filename
 
+    def _get_playback_progress(self, episode):
+        if episode.total_time > 0 and episode.current_position > 0:
+            return float(episode.current_position) / float(episode.total_time)
+
+        return 0
+
     def convert_podcast(self, podcast):
         total, deleted, new, downloaded, unplayed = podcast.get_statistics()
 
@@ -118,6 +124,7 @@ class gPotherSide:
             'progress': episode.download_progress(),
             'downloadState': episode.state,
             'isNew': episode.is_new,
+            'playbackProgress': self._get_playback_progress(episode),
         }
 
     def load_episodes(self, id):
@@ -254,8 +261,16 @@ class gPotherSide:
             'source': episode.local_filename(False)
                 if episode.state == gpodder.STATE_DOWNLOADED
                 else episode.url,
+            'position': episode.current_position,
+            'total': episode.total_time,
         }
 
+    def report_playback_event(self, episode_id, position_from, position_to, duration):
+        episode = self._get_episode_by_id(episode_id)
+        print('Played', episode.title, 'from', position_from, 'to', position_to, 'of', duration)
+        episode.report_playback_event(position_from, position_to, duration)
+        pyotherside.send('playback-progress', episode_id, self._get_playback_progress(episode))
+
     def show_episode(self, episode_id):
         episode = self._get_episode_by_id(episode_id)
         if episode is None:
@@ -287,3 +302,4 @@ delete_episode = gpotherside.delete_episode
 toggle_new = gpotherside.toggle_new
 rename_podcast = gpotherside.rename_podcast
 change_section = gpotherside.change_section
+report_playback_event = gpotherside.report_playback_event