Merge branch 'master' of ssh://git.carlh.net/home/carl/git/dcpomatic

[dcpomatic.git] / src / lib / ffmpeg.cc

diff --git a/src/lib/ffmpeg.cc b/src/lib/ffmpeg.cc
index 6103ccd50ed98863afeb31f6087cddb251226765..954aff728386cb198ff4d79d0839ac3bdff8f169 100644 (file)
--- a/src/lib/ffmpeg.cc
+++ b/src/lib/ffmpeg.cc
@@ -26,6 +26,7 @@
 #include "log.h"
 #include "ffmpeg_subtitle_stream.h"
 #include "ffmpeg_audio_stream.h"
+#include "md5_digester.h"
 #include "compose.hpp"
 extern "C" {
 #include <libavcodec/avcodec.h>
@@ -268,6 +269,25 @@ FFmpeg::subtitle_period (AVSubtitle const & sub)
                );
 }
 
+string
+FFmpeg::subtitle_id (AVSubtitle const & sub)
+{
+       MD5Digester digester;
+       digester.add (sub.pts);
+       for (unsigned int i = 0; i < sub.num_rects; ++i) {
+               AVSubtitleRect* rect = sub.rects[i];
+               digester.add (rect->x);
+               digester.add (rect->y);
+               digester.add (rect->w);
+               digester.add (rect->h);
+               int const line = rect->pict.linesize[0];
+               for (int j = 0; j < rect->h; ++j) {
+                       digester.add (rect->pict.data[0] + j * line, line);
+               }
+       }
+       return digester.get ();
+}
+
 /** Compute the pts offset to use given a set of audio streams and some video details.
  *  Sometimes these parameters will have just been determined by an Examiner, sometimes
  *  they will have been retrieved from a piece of Content, hence the need for this method