From b20dac505d44a35a8feaef763e52c84c8fe24f99 Mon Sep 17 00:00:00 2001
From: Single <libobjc@gmail.com>
Date: Thu, 28 Nov 2019 15:32:15 +0800
Subject: [PATCH] SGVideoDecoder: Reset frame rate.

---
 .../Classes/Core/SGDecoder/SGVideoDecoder.m   | 26 ++++++++++++++++++-
 .../Classes/Core/SGOption/SGDecoderOptions.m  |  2 +-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/SGPlayer/Classes/Core/SGDecoder/SGVideoDecoder.m b/SGPlayer/Classes/Core/SGDecoder/SGVideoDecoder.m
index 2611532d..461f5eae 100644
--- a/SGPlayer/Classes/Core/SGDecoder/SGVideoDecoder.m
+++ b/SGPlayer/Classes/Core/SGDecoder/SGVideoDecoder.m
@@ -340,7 +340,31 @@ - (void)flush
 
 - (NSArray<__kindof SGFrame *> *)resampleFrames:(NSArray<__kindof SGFrame *> *)frames
 {
-    return frames;
+    if (!self->_options.resetFrameRate &&
+        CMTIME_IS_NUMERIC(self->_options.preferredFrameRate)) {
+        return frames;
+    }
+    CMTime frameRate = self->_options.preferredFrameRate;
+    NSMutableArray *ret = [NSMutableArray array];
+    for (SGVideoFrame *obj in frames) {
+        SGVideoFrame *frame = obj;
+        while (CMTimeCompare(frame.duration, frameRate) > 0) {
+            CMTime start = CMTimeAdd(frame.timeStamp, frameRate);
+            CMTime duration = CMTimeSubtract(frame.duration, frameRate);
+            SGCodecDescriptor *cd = [[SGCodecDescriptor alloc] init];
+            cd.track = frame.track;
+            cd.metadata = frame.codecDescriptor.metadata;
+            [frame setCodecDescriptor:cd];
+            [frame fillWithTimeStamp:frame.timeStamp decodeTimeStamp:frame.timeStamp duration:frameRate];
+            SGVideoFrame *newFrame = [SGVideoFrame frame];
+            [newFrame fillWithFrame:frame];
+            [newFrame fillWithTimeStamp:start decodeTimeStamp:start duration:duration];
+            [ret addObject:frame];
+            frame = newFrame;
+        }
+        [ret addObject:frame];
+    }
+    return ret;
 }
 
 @end
diff --git a/SGPlayer/Classes/Core/SGOption/SGDecoderOptions.m b/SGPlayer/Classes/Core/SGOption/SGDecoderOptions.m
index 8127e14f..1fbf31ef 100644
--- a/SGPlayer/Classes/Core/SGOption/SGDecoderOptions.m
+++ b/SGPlayer/Classes/Core/SGOption/SGDecoderOptions.m
@@ -41,7 +41,7 @@ - (instancetype)init
         self->_supportedPixelFormats = [SGVideoRenderer supportedPixelFormats];
         self->_supportedAudioDescriptors = @[[SGAudioRenderer supportedAudioDescriptor]];
         self->_resetFrameRate = NO;
-        self->_preferredFrameRate = CMTimeMake(1, 25);
+        self->_preferredFrameRate = CMTimeMake(1, 20);
     }
     return self;
 }