[gegl] ff-load: make video-less decoding also work for mp3 files

[Øyvind Kolås <ok src gnome org>]

commit babe834d4f9ef791b9333bd8cab4757d01f2e41b
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Jan 22 07:38:30 2018 +0100

    ff-load: make video-less decoding also work for mp3 files
    
    Though for both ogg vorbis and mp3 that have been tested, the duration is off
    and decoding stops after a the first handfuls of seconds.

 operations/external/ff-load.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/operations/external/ff-load.c b/operations/external/ff-load.c
index fb119be..670a15b 100644
--- a/operations/external/ff-load.c
+++ b/operations/external/ff-load.c
@@ -325,6 +325,9 @@ decode_frame (GeglOperation *operation,
     }
 
   decodeframe = frame;
+  if (p->video_stream)
+  {
+
   if (frame < 2 || frame > prevframe + 64 || frame < prevframe )
   {
     int64_t seek_target = av_rescale_q (((frame) * AV_TIME_BASE * 1.0) / o->frame_rate
@@ -393,6 +396,7 @@ decode_frame (GeglOperation *operation,
       while (!got_picture);
     }
     while (decodeframe <= frame + p->codec_delay);
+  }
 
   p->prevframe = frame;
   return 0;