From 53313e1450c19fbb671f6b5512b6e7cca9463835 Mon Sep 17 00:00:00 2001
From: Memphiz <memphis@machzwo.de>
Date: Sat, 22 Sep 2012 22:00:12 +0200
Subject:  [dvdplayer/PGS-subs] - fix PGS Subtitles like ffmpeg did it in
 http://git.videolan.org/?p=ffmpeg.git;a=commit;h=2939e258f9d1fff89b3b68536beb931b54611585
 - fixes #12074

---
 .../DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.cpp    | 39 ++++++++++++++++++++--
 .../DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.h      |  2 ++
 xbmc/cores/dvdplayer/DVDPlayerSubtitle.cpp         |  4 +--
 3 files changed, 40 insertions(+), 5 deletions(-)

diff --git a/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.cpp b/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.cpp
index 4028efb827..13eff26dde 100644
--- a/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.cpp
+++ b/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.cpp
@@ -33,6 +33,8 @@ CDVDOverlayCodecFFmpeg::CDVDOverlayCodecFFmpeg() : CDVDOverlayCodec("FFmpeg Subt
   m_SubtitleIndex = -1;
   m_width         = 0;
   m_height        = 0;
+  m_StartTime     = 0.0;
+  m_StopTime      = 0.0;
   memset(&m_Subtitle, 0, sizeof(m_Subtitle));
 }
 
@@ -60,6 +62,8 @@ bool CDVDOverlayCodecFFmpeg::Open(CDVDStreamInfo &hints, CDVDCodecOptions &optio
   m_pCodecContext->workaround_bugs = FF_BUG_AUTODETECT;
   m_pCodecContext->sub_id = hints.identifier;
   m_pCodecContext->codec_tag = hints.codec_tag;
+  m_pCodecContext->time_base.num = 1;
+  m_pCodecContext->time_base.den = DVD_TIME_BASE;
 
   if( hints.extradata && hints.extrasize > 0 )
   {
@@ -142,6 +146,8 @@ void CDVDOverlayCodecFFmpeg::FreeSubtitle(AVSubtitle& sub)
   if(sub.rects)
     m_dllAvUtil.av_freep(&sub.rects);
   sub.num_rects = 0;
+  sub.start_display_time = 0;
+  sub.end_display_time = 0;
 }
 
 int CDVDOverlayCodecFFmpeg::Decode(DemuxPacket *pPacket)
@@ -158,6 +164,15 @@ int CDVDOverlayCodecFFmpeg::Decode(DemuxPacket *pPacket)
   avpkt.data = pPacket->pData;
   avpkt.size = pPacket->iSize;
 
+  // for PGS subtitles we have to satisfy the assumptions of ffmpeg
+  // introduced here:
+  // http://git.videolan.org/?p=ffmpeg.git;a=commit;h=9dd82724315d651891f2a1ed733c4de06e9cb07a
+  // these are - valid packet pts
+  if (m_pCodecContext->codec_id == CODEC_ID_HDMV_PGS_SUBTITLE)
+  {
+    avpkt.pts = pPacket->pts;
+  }
+
   len = m_dllAvCodec.avcodec_decode_subtitle2(m_pCodecContext, &m_Subtitle, &gotsub, &avpkt);
 
   if (len < 0)
@@ -172,6 +187,24 @@ int CDVDOverlayCodecFFmpeg::Decode(DemuxPacket *pPacket)
   if (!gotsub)
     return OC_BUFFER;
 
+  m_StartTime   = DVD_MSEC_TO_TIME(m_Subtitle.start_display_time);
+  m_StopTime    = DVD_MSEC_TO_TIME(m_Subtitle.end_display_time);  
+  
+  if (m_pCodecContext->codec_id == CODEC_ID_HDMV_PGS_SUBTITLE && m_Subtitle.format == 0) 
+  {
+    // for pgs subtitles the packet pts of the end_segments are wrong
+    // instead use the subtitle pts to calc the offset here
+    // see http://git.videolan.org/?p=ffmpeg.git;a=commit;h=2939e258f9d1fff89b3b68536beb931b54611585
+    if (m_Subtitle.pts != DVD_NOPTS_VALUE)
+    {
+      double pts_offset = m_Subtitle.pts - pPacket->pts;
+      m_StartTime = m_Subtitle.start_display_time + DVD_TIME_TO_MSEC(pts_offset);
+      m_StopTime  = m_Subtitle.end_display_time + DVD_TIME_TO_MSEC(pts_offset);
+      m_StartTime = DVD_MSEC_TO_TIME(m_StartTime);
+      m_StopTime  = DVD_MSEC_TO_TIME(m_StopTime);
+    }
+  }
+
   m_SubtitleIndex = 0;
 
   return OC_OVERLAY;
@@ -199,7 +232,7 @@ CDVDOverlay* CDVDOverlayCodecFFmpeg::GetOverlay()
   {
     // we must add an empty overlay to replace the previous one
     CDVDOverlay* o = new CDVDOverlay(DVDOVERLAY_TYPE_NONE);
-    o->iPTSStartTime = 0;
+    o->iPTSStartTime = m_StartTime;
     o->iPTSStopTime  = 0;
     o->replace  = true;
     m_SubtitleIndex++;
@@ -221,8 +254,8 @@ CDVDOverlay* CDVDOverlayCodecFFmpeg::GetOverlay()
 
     CDVDOverlayImage* overlay = new CDVDOverlayImage();
 
-    overlay->iPTSStartTime = DVD_MSEC_TO_TIME(m_Subtitle.start_display_time);
-    overlay->iPTSStopTime  = DVD_MSEC_TO_TIME(m_Subtitle.end_display_time);
+    overlay->iPTSStartTime = m_StartTime;
+    overlay->iPTSStopTime  = m_StopTime;
     overlay->replace  = true;
     overlay->linesize = rect.w;
     overlay->data     = (BYTE*)malloc(rect.w * rect.h);
diff --git a/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.h b/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.h
index d7611d1a0b..a267e6e638 100644
--- a/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.h
+++ b/xbmc/cores/dvdplayer/DVDCodecs/Overlay/DVDOverlayCodecFFmpeg.h
@@ -45,6 +45,8 @@ private:
   AVCodecContext* m_pCodecContext;
   AVSubtitle      m_Subtitle;
   int             m_SubtitleIndex;
+  double          m_StartTime;
+  double          m_StopTime;
 
   int             m_width;
   int             m_height;
diff --git a/xbmc/cores/dvdplayer/DVDPlayerSubtitle.cpp b/xbmc/cores/dvdplayer/DVDPlayerSubtitle.cpp
index c945e90f38..92d9e51c19 100644
--- a/xbmc/cores/dvdplayer/DVDPlayerSubtitle.cpp
+++ b/xbmc/cores/dvdplayer/DVDPlayerSubtitle.cpp
@@ -99,9 +99,9 @@ void CDVDPlayerSubtitle::SendMessage(CDVDMsg* pMsg)
           else
             pts = overlay->iPTSStartTime;
 
-          overlay->iPTSStartTime = pts;
+          overlay->iPTSStartTime += pts;
           if(duration)
-            overlay->iPTSStopTime = pts + duration;
+            overlay->iPTSStopTime += (pts + duration);
           else
           {
             overlay->iPTSStopTime = 0;
-- 
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