SGDmuxable: Track infos.

SGPlayer/Classes/Core/SGAsset/SGMutableTrack.h

@@ -12,6 +12,13 @@
 
 @interface SGMutableTrack : SGTrack
 
+/*!
+ @property subTracks
+ @abstract
+    Indicates the sub tracks.
+ */
+@property (nonatomic, copy, readonly) NSArray<SGTrack *> *subTracks;
+
 /*!
  @property segments
  @abstract

SGPlayer/Classes/Core/SGAsset/SGMutableTrack.m

@@ -23,6 +23,7 @@ - (id)copyWithZone:(NSZone *)zone
 {
     SGMutableTrack *obj = [super copyWithZone:zone];
     obj->_segments = [self->_segments mutableCopy];
+    obj->_subTracks = [self->_subTracks copy];
     return obj;
 }
 
@@ -34,9 +35,19 @@ - (instancetype)initWithType:(SGMediaType)type index:(NSInteger)index
     return self;
 }
 
-- (NSArray<SGSegment *> *)segments
+- (void *)coreptr
 {
-    return [self->_segments copy];
+    void *ret = [super coreptr];
+    if (ret) {
+        return ret;
+    }
+    for (SGTrack *obj in self->_subTracks) {
+        if (obj.coreptr) {
+            ret = obj.coreptr;
+            break;
+        }
+    }
+    return ret;
 }
 
 - (BOOL)appendSegment:(SGSegment *)segment

SGPlayer/Classes/Core/SGAsset/SGTrack+Internal.h

@@ -7,6 +7,8 @@
 //
 
 #import "SGTrack.h"
+#import "SGMutableTrack.h"
+#import "avformat.h"
 
 @interface SGTrack ()
 
@@ -17,4 +19,22 @@
  */
 - (instancetype)initWithType:(SGMediaType)type index:(NSInteger)index;
 
+/*!
+ @property core
+ @abstract
+    Indicates the pointer to the AVStream.
+*/
+@property (nonatomic) AVStream *core;
+
+@end
+
+@interface SGMutableTrack ()
+
+/*!
+ @property subTracks
+ @abstract
+    Indicates the sub tracks.
+ */
+@property (nonatomic, copy) NSArray<SGTrack *> *subTracks;
+
 @end

SGPlayer/Classes/Core/SGAsset/SGTrack.h

@@ -14,6 +14,13 @@
 + (instancetype)new NS_UNAVAILABLE;
 - (instancetype)init NS_UNAVAILABLE;
 
+/*!
+ @property coreptr
+ @abstract
+    Indicates the pointer to the AVStream.
+ */
+@property (nonatomic, readonly) void *coreptr;
+
 /*!
  @property type
  @abstract

SGPlayer/Classes/Core/SGAsset/SGTrack.m

@@ -16,6 +16,7 @@ - (id)copyWithZone:(NSZone *)zone
     SGTrack *obj = [[self.class alloc] init];
     obj->_type = self->_type;
     obj->_index = self->_index;
+    obj->_core = self->_core;
     return obj;
 }
 
@@ -28,4 +29,9 @@ - (instancetype)initWithType:(SGMediaType)type index:(NSInteger)index
     return self;
 }
 
+- (void *)coreptr
+{
+    return self->_core;
+}
+
 @end

SGPlayer/Classes/Core/SGData/SGFrame.h

@@ -17,7 +17,7 @@ static int const SGFramePlaneCount = 8;
 /**
  *
  */
-@property (nonatomic, readonly) void * coreptr;
+@property (nonatomic, readonly) void *coreptr;
 
 /**
  *

SGPlayer/Classes/Core/SGDemuxer/SGTrackDemuxer.m

@@ -7,6 +7,7 @@
 //
 
 #import "SGTrackDemuxer.h"
+#import "SGTrack+Internal.h"
 #import "SGPacket+Internal.h"
 #import "SGSegment+Internal.h"
 #import "SGError.h"
@@ -70,6 +71,7 @@ - (SGDemuxerOptions *)options
 - (NSError *)open
 {
     CMTime basetime = kCMTimeZero;
+    NSMutableArray<SGTrack *> *subTracks = [NSMutableArray array];
     for (SGSegment *obj in self->_track.segments) {
         SGTimeLayout *layout = [[SGTimeLayout alloc] initWithOffset:basetime];
         id<SGDemuxable> demuxer = [obj newDemuxable];
@@ -83,8 +85,12 @@ - (NSError *)open
         NSAssert(!demuxer.tracks.firstObject || demuxer.tracks.firstObject.type == self->_track.type, @"Invaild mediaType.");
 
         basetime = CMTimeAdd(basetime, demuxer.duration);
+        if (demuxer.tracks.firstObject) {
+            [subTracks addObject:demuxer.tracks.firstObject];
+        }
     }
     self->_duration = basetime;
+    self->_track.subTracks = subTracks;
     self->_currentLayout = self->_layouts.firstObject;
     self->_currentDemuxer = self->_demuxers.firstObject;
     [self->_currentDemuxer seekToTime:kCMTimeZero];

SGPlayer/Classes/Core/SGDemuxer/SGURLDemuxer.m

@@ -72,6 +72,7 @@ - (NSError *)open
             type = SGMediaTypeUnknown;
         }
         SGTrack *obj = [[SGTrack alloc] initWithType:type index:i];
+        obj.core = stream;
         [tracks addObject:obj];
     }
     self->_tracks = [tracks copy];