From 10675d7568e66b0bcf9bfccfd3ae337bcf8860cb Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Sat, 22 Sep 2018 21:04:50 +0200
Subject: [PATCH] Show time remaining when playing clips live.

---
 mainwindow.cpp   | 27 +++++++++++++++++++++++++++
 mainwindow.h     |  1 +
 player.cpp       |  7 +++++++
 player.h         |  6 ++++++
 ui_mainwindow.ui |  4 ++--
 5 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/mainwindow.cpp b/mainwindow.cpp
index f0a0341..c168611 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -3,6 +3,7 @@
 #include "clip_list.h"
 #include "player.h"
 #include "post_to_main_thread.h"
+#include "timebase.h"
 #include "ui_mainwindow.h"
 
 #include <string>
@@ -107,6 +108,11 @@ MainWindow::MainWindow()
 			live_player_clip_done();
 		});
 	});
+	live_player->set_progress_callback([this](double played_this_clip, double total_length) {
+		post_to_main_thread([this, played_this_clip, total_length] {
+			live_player_clip_progress(played_this_clip, total_length);
+		});
+	});
 }
 
 void MainWindow::cue_in_clicked()
@@ -263,7 +269,28 @@ void MainWindow::live_player_clip_done()
 		playlist_clips->set_currently_playing(row);
 	} else {
 		playlist_clips->set_currently_playing(-1);
+		ui->live_label->setText("Current output (paused)");
+	}
+}
+
+void MainWindow::live_player_clip_progress(double played_this_clip, double total_length)
+{
+	double remaining = total_length - played_this_clip;
+	for (int row = playlist_clips->get_currently_playing() + 1; row < int(playlist_clips->size()); ++row) {
+		const Clip clip = *playlist_clips->clip(row);
+		remaining += double(clip.pts_out - clip.pts_in) / TIMEBASE / 0.5;   // FIXME: stop hardcoding speed.
 	}
+	int remaining_ms = lrint(remaining * 1e3);
+
+	int ms = remaining_ms % 1000;
+	remaining_ms /= 1000;
+	int s = remaining_ms % 60;
+	remaining_ms /= 60;
+	int m = remaining_ms;
+
+	char buf[256];
+	snprintf(buf, sizeof(buf), "Current output (%d:%02d.%03d left)", m, s, ms);
+	ui->live_label->setText(buf);
 }
 
 void MainWindow::resizeEvent(QResizeEvent *event)
diff --git a/mainwindow.h b/mainwindow.h
index 4801667..24eea60 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -47,6 +47,7 @@ private:
 	void preview_angle_clicked(unsigned stream_idx);
 	void play_clicked();
 	void live_player_clip_done();
+	void live_player_clip_progress(double played_this_clip, double total_length);
 	void playlist_duplicate();
 	void playlist_remove();
 	void playlist_move(int delta);
diff --git a/player.cpp b/player.cpp
index 5ff448c..1eea8d7 100644
--- a/player.cpp
+++ b/player.cpp
@@ -136,6 +136,13 @@ void Player::thread_func(bool also_output_to_stream)
 				}
 			}
 
+			if (progress_callback != nullptr) {
+				// NOTE: None of this will take into account any snapping done below.
+				double played_this_clip = double(in_pts - clip.pts_in) / TIMEBASE / speed;
+				double total_length = double(clip.pts_out - clip.pts_in) / TIMEBASE / speed;
+				progress_callback(played_this_clip, total_length);
+			}
+
 			if (in_pts_lower == in_pts_upper) {
 				destination->setFrame(stream_idx, in_pts_lower, /*interpolated=*/false);
 				if (video_stream != nullptr) {
diff --git a/player.h b/player.h
index 10e0b6a..a10a7cb 100644
--- a/player.h
+++ b/player.h
@@ -28,6 +28,11 @@ public:
 	using done_callback_func = std::function<void()>;
 	void set_done_callback(done_callback_func cb) { done_callback = cb; }
 
+	// Not thread-safe to set concurrently with playing.
+	// Will be called back from the player thread.
+	using progress_callback_func = std::function<void(double played_this_clip, double total_length)>;
+	void set_progress_callback(progress_callback_func cb) { progress_callback = cb; }
+
 private:
 	void thread_func(bool also_output_to_stream);
 	void open_output_stream();
@@ -36,6 +41,7 @@ private:
 
 	JPEGFrameView *destination;
 	done_callback_func done_callback;
+	progress_callback_func progress_callback;
 
 	std::mutex mu;
 	Clip current_clip;  // Under mu. Can have pts_in = -1 for no clip.
diff --git a/ui_mainwindow.ui b/ui_mainwindow.ui
index 183fcea..01b05b3 100644
--- a/ui_mainwindow.ui
+++ b/ui_mainwindow.ui
@@ -146,9 +146,9 @@
            <widget class="JPEGFrameView" name="live_display" native="true"/>
           </item>
           <item>
-           <widget class="QLabel" name="label_3">
+           <widget class="QLabel" name="live_label">
             <property name="text">
-             <string>Current output</string>
+             <string>Current output (paused)</string>
             </property>
             <property name="alignment">
              <set>Qt::AlignCenter</set>
-- 
2.39.2