fix: #352 mov elst segment duration timescale

Author: ireader

libmov/source/mov-elst.c

@@ -105,7 +105,7 @@ size_t mov_write_elst(const struct mov_t* mov)
 	return size;
 }
 
-void mov_apply_elst(struct mov_track_t *track)
+void mov_apply_elst(struct mov_track_t *track, uint32_t timescale)
 {
     size_t i;
 
@@ -116,21 +116,21 @@ void mov_apply_elst(struct mov_track_t *track)
     {
         if (-1 == track->elst[i].media_time)
         {
-            track->samples[0].dts = track->elst[i].segment_duration;
+            track->samples[0].dts = track->elst[i].segment_duration * track->mdhd.timescale / timescale; // movie timescale -> track timescale
             track->samples[0].pts = track->samples[0].dts;
         }
     }
 }
 
-void mov_apply_elst_tfdt(struct mov_track_t *track)
+void mov_apply_elst_tfdt(struct mov_track_t *track, uint32_t timescale)
 {
     size_t i;
 
     for (i = 0; i < track->elst_count; i++)
     {
         if (-1 == track->elst[i].media_time)
         {
-            track->tfdt_dts += track->elst[i].segment_duration;
+            track->tfdt_dts += track->elst[i].segment_duration * track->mdhd.timescale / timescale; // movie timescale -> track timescale
         }
     }
 }

libmov/source/mov-internal.h

@@ -307,11 +307,11 @@ uint32_t mov_build_stts(struct mov_track_t* track);
 uint32_t mov_build_ctts(struct mov_track_t* track);
 uint32_t mov_build_stco(struct mov_track_t* track);
 void mov_apply_stco(struct mov_track_t* track);
-void mov_apply_elst(struct mov_track_t *track);
+void mov_apply_elst(struct mov_track_t *track, uint32_t timescale);
 void mov_apply_stts(struct mov_track_t* track);
 void mov_apply_ctts(struct mov_track_t* track);
 void mov_apply_stss(struct mov_track_t* track);
-void mov_apply_elst_tfdt(struct mov_track_t *track);
+void mov_apply_elst_tfdt(struct mov_track_t *track, uint32_t timescale);
 
 void mov_write_size(const struct mov_t* mov, uint64_t offset, size_t size);
 

libmov/source/mov-reader.c

@@ -103,7 +103,7 @@ static int mov_read_trak(struct mov_t* mov, const struct mov_box_t* box)
         if (mov->track->sample_count > 0)
         {
             mov_apply_stco(mov->track);
-            mov_apply_elst(mov->track);
+            mov_apply_elst(mov->track, mov->mvhd.timescale);
             mov_apply_stts(mov->track);
             mov_apply_ctts(mov->track);
 			mov_apply_stss(mov->track);

libmov/source/mov-tfdt.c

@@ -17,7 +17,7 @@ int mov_read_tfdt(struct mov_t* mov, const struct mov_box_t* box)
         mov->track->tfdt_dts = mov_buffer_r32(&mov->io); /* baseMediaDecodeTime */
 
     // baseMediaDecodeTime + ELST start offset
-    mov_apply_elst_tfdt(mov->track);
+    mov_apply_elst_tfdt(mov->track, mov->mvhd.timescale);
 
 	(void)box;
     return mov_buffer_error(&mov->io);