修复部分flac播放到末尾不自动停止的问题

Author: axel10

Sources/CSFBAudioEngine/Decoders/SFBFLACDecoder.mm

@@ -446,6 +446,16 @@ - (BOOL)decodeIntoBuffer:(AVAudioPCMBuffer *)buffer frameLength:(AVAudioFrameCou
         return YES;
     }
 
+    if (_streamInfo.total_samples > 0) {
+        if (_framePosition >= static_cast<AVAudioFramePosition>(_streamInfo.total_samples)) {
+            return YES;
+        }
+        const auto framesRemaining = _streamInfo.total_samples - static_cast<uint64_t>(_framePosition);
+        if (framesRemaining < frameLength) {
+            frameLength = static_cast<AVAudioFrameCount>(framesRemaining);
+        }
+    }
+
     AVAudioFrameCount framesProcessed = 0;
 
     for (;;) {
@@ -501,6 +511,7 @@ - (BOOL)seekToFrame:(AVAudioFramePosition)frame error:(NSError **)error {
     }
 
     _framePosition = frame;
+    _frameBuffer.frameLength = 0;
     return YES;
 }