From 134eaa1583b180ceceff40b669ae965dc1a51412 Mon Sep 17 00:00:00 2001
From: Laserlicht <13953785+Laserlicht@users.noreply.github.com>
Date: Wed, 24 Jan 2024 01:17:23 +0100
Subject: [PATCH] sync subtitle

---
 client/CMusicHandler.cpp               | 28 ++++++++++++++++++++++++++
 client/CMusicHandler.h                 |  1 +
 client/mainmenu/CPrologEpilogVideo.cpp | 26 +++++++++++++++++-------
 client/mainmenu/CPrologEpilogVideo.h   |  2 ++
 4 files changed, 50 insertions(+), 7 deletions(-)

diff --git a/client/CMusicHandler.cpp b/client/CMusicHandler.cpp
index b6101c7cb..2d9c64fb0 100644
--- a/client/CMusicHandler.cpp
+++ b/client/CMusicHandler.cpp
@@ -183,6 +183,34 @@ void CSoundHandler::ambientStopSound(const AudioPath & soundId)
 	setChannelVolume(ambientChannels[soundId], volume);
 }
 
+double CSoundHandler::getSoundDuration(const AudioPath & sound) {
+	if (!initialized || sound.empty())
+		return 0.0;
+
+	auto data = CResourceHandler::get()->load(sound.addPrefix("SOUNDS/"))->readAll();
+
+    SDL_AudioSpec spec;
+    uint32_t audioLen;
+    uint8_t *audioBuf;
+    double seconds = 0.0;
+
+    if(SDL_LoadWAV_RW(SDL_RWFromMem(data.first.get(), (int)data.second), 1, &spec, &audioBuf, &audioLen) != NULL) {
+        SDL_FreeWAV(audioBuf);
+        uint32_t sampleSize = SDL_AUDIO_BITSIZE(spec.format) / 8;
+        uint32_t sampleCount = audioLen / sampleSize;
+        uint32_t sampleLen = 0;
+        if(spec.channels) {
+            sampleLen = sampleCount / spec.channels;
+        } else {
+            sampleLen = sampleCount;
+        }
+        seconds = (double)sampleLen / (double)spec.freq;
+    } else
+        return 0.0;
+
+    return seconds;
+}
+
 // Plays a sound, and return its channel so we can fade it out later
 int CSoundHandler::playSound(soundBase::soundID soundID, int repeats)
 {
diff --git a/client/CMusicHandler.h b/client/CMusicHandler.h
index f0b653e7c..514a16834 100644
--- a/client/CMusicHandler.h
+++ b/client/CMusicHandler.h
@@ -77,6 +77,7 @@ public:
 	void setChannelVolume(int channel, ui32 percent);
 
 	// Sounds
+	double getSoundDuration(const AudioPath & sound);
 	int playSound(soundBase::soundID soundID, int repeats=0);
 	int playSound(const AudioPath & sound, int repeats=0, bool cache=false);
 	int playSound(std::pair<std::unique_ptr<ui8 []>, si64> & data, int repeats=0, bool cache=false);
diff --git a/client/mainmenu/CPrologEpilogVideo.cpp b/client/mainmenu/CPrologEpilogVideo.cpp
index d81bd07e7..98cdb1ad4 100644
--- a/client/mainmenu/CPrologEpilogVideo.cpp
+++ b/client/mainmenu/CPrologEpilogVideo.cpp
@@ -14,13 +14,15 @@
 #include "../CGameInfo.h"
 #include "../CMusicHandler.h"
 #include "../CVideoHandler.h"
+#include "../gui/WindowHandler.h"
 #include "../gui/CGuiHandler.h"
+#include "../gui/FramerateManager.h"
 #include "../widgets/TextControls.h"
 #include "../render/Canvas.h"
 
 
 CPrologEpilogVideo::CPrologEpilogVideo(CampaignScenarioPrologEpilog _spe, std::function<void()> callback)
-	: CWindowObject(BORDERED), spe(_spe), positionCounter(0), voiceSoundHandle(-1), videoSoundHandle(-1), exitCb(callback)
+	: CWindowObject(BORDERED), spe(_spe), positionCounter(0), voiceSoundHandle(-1), videoSoundHandle(-1), exitCb(callback), elapsedTime(0)
 {
 	OBJ_CONSTRUCTION_CAPTURING_ALL_NO_DISPOSE;
 	addUsedEvents(LCLICK);
@@ -31,32 +33,42 @@ CPrologEpilogVideo::CPrologEpilogVideo(CampaignScenarioPrologEpilog _spe, std::f
 	videoSoundHandle = CCS->soundh->playSound(audioData);
 	CCS->videoh->open(spe.prologVideo);
 	CCS->musich->playMusic(spe.prologMusic, true, true);
+	voiceDuration = CCS->soundh->getSoundDuration(spe.prologVoice);
 	voiceSoundHandle = CCS->soundh->playSound(spe.prologVoice);
 	auto onVoiceStop = [this]()
 	{
 		voiceStopped = true;
+		elapsedTime = 0.0;
 	};
 	CCS->soundh->setCallback(voiceSoundHandle, onVoiceStop);
 
 	text = std::make_shared<CMultiLineLabel>(Rect(100, 500, 600, 100), EFonts::FONT_BIG, ETextAlignment::CENTER, Colors::METALLIC_GOLD, spe.prologText.toString());
-	text->scrollTextTo(-100);
+	text->scrollTextTo(-50);
 }
 
 void CPrologEpilogVideo::show(Canvas & to)
 {
+	elapsedTime += GH.framerate().getElapsedMilliseconds() / 1000.0;
+
 	to.drawColor(pos, Colors::BLACK);
 	//some videos are 800x600 in size while some are 800x400
 	CCS->videoh->update(pos.x, pos.y + (CCS->videoh->size().y == 400 ? 100 : 0), to.getInternalSurface(), true, false);
 
-	//move text every 5 calls/frames; seems to be good enough
-	++positionCounter;
-	if(positionCounter % 5 == 0)
+	const double speed = (voiceDuration == 0.0) ? 0.1 : (voiceDuration / (text->textSize.y));
+
+	if(elapsedTime > speed && text->textSize.y - 50 > positionCounter)
+	{
 		text->scrollTextBy(1);
+		elapsedTime = 0.0;
+		++positionCounter;
+	}
 	else
+	{
 		text->showAll(to); // blit text over video, if needed
 
-	if(text->textSize.y + 100 < positionCounter / 5 && voiceStopped)
-		clickPressed(GH.getCursorPosition());
+		if(elapsedTime > (voiceDuration == 0.0 ? 6.0 : 3.0) && voiceStopped)
+			clickPressed(GH.getCursorPosition());
+	}
 }
 
 void CPrologEpilogVideo::clickPressed(const Point & cursorPosition)
diff --git a/client/mainmenu/CPrologEpilogVideo.h b/client/mainmenu/CPrologEpilogVideo.h
index 1666a87c1..ffee32e12 100644
--- a/client/mainmenu/CPrologEpilogVideo.h
+++ b/client/mainmenu/CPrologEpilogVideo.h
@@ -19,6 +19,8 @@ class CPrologEpilogVideo : public CWindowObject
 	CampaignScenarioPrologEpilog spe;
 	int positionCounter;
 	int voiceSoundHandle;
+	double voiceDuration;
+	double elapsedTime;
 	int videoSoundHandle;
 	std::function<void()> exitCb;