From 7797bf497168f6fb48bcebed4bbc3ce13b36ca5c Mon Sep 17 00:00:00 2001
From: itsmattkc <itsmattkc@gmail.com>
Date: Fri, 21 Feb 2020 01:18:21 +1100
Subject: [PATCH] ffmpegdecoder: added helper functions for memory handling

---
 app/codec/ffmpeg/ffmpegdecoder.cpp | 22 ++++++++++++++++++++++
 app/codec/ffmpeg/ffmpegdecoder.h   |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/app/codec/ffmpeg/ffmpegdecoder.cpp b/app/codec/ffmpeg/ffmpegdecoder.cpp
index 4aa0168bc..c655cd2ae 100644
--- a/app/codec/ffmpeg/ffmpegdecoder.cpp
+++ b/app/codec/ffmpeg/ffmpegdecoder.cpp
@@ -1007,6 +1007,28 @@ void FFmpegDecoder::CacheFrameToDisk(AVFrame *f)
   }
 }
 
+void FFmpegDecoder::RemoveFirstFromFrameCache()
+{
+  if (cached_frames_.isEmpty()) {
+    return;
+  }
+
+  av_frame_free(&cached_frames_.first());
+  cached_frames_.removeFirst();
+  cache_at_zero_ = false;
+}
+
+void FFmpegDecoder::RemoveLastFromFrameCache()
+{
+  if (cached_frames_.isEmpty()) {
+    return;
+  }
+
+  av_frame_free(&cached_frames_.last());
+  cached_frames_.removeLast();
+  cache_at_eof_ = false;
+}
+
 void FFmpegDecoder::ClearFrameCache()
 {
   for (int i=0;i<cached_frames_.size();i++) {
diff --git a/app/codec/ffmpeg/ffmpegdecoder.h b/app/codec/ffmpeg/ffmpegdecoder.h
index 2df6692a3..041a59ced 100644
--- a/app/codec/ffmpeg/ffmpegdecoder.h
+++ b/app/codec/ffmpeg/ffmpegdecoder.h
@@ -104,6 +104,8 @@ private:
 
   void CacheFrameToDisk(AVFrame* f);
 
+  void RemoveFirstFromFrameCache();
+  void RemoveLastFromFrameCache();
   void ClearFrameCache();
 
   AVFormatContext* fmt_ctx_;