Fix deadlock at the end of decoding.

[tyan0]

Issue

For some h264 files, h264dec hangs at the end of decoding. This is regression caused by the commit 1c23887. This patch fixes the issue by adding SET_EVENT(&m_sReleaseBufferEvent) to SetOption(DECODER_OPTION_END_OF_STREAM).

To reproduce

• Apply the following patch to h264dec and build it to enable multi-thread decoding.

diff --git a/codec/console/dec/src/h264dec.cpp b/codec/console/dec/src/h264dec.cpp
index 78c5c5d0..4851062f 100644
--- a/codec/console/dec/src/h264dec.cpp
+++ b/codec/console/dec/src/h264dec.cpp
@@ -622,7 +622,7 @@ int32_t main (int32_t iArgC, char* pArgV[]) {
     pDecoder->SetOption (DECODER_OPTION_TRACE_LEVEL, &iLevelSetting);
   }

-  int32_t iThreadCount = 0;
+  int32_t iThreadCount = 3;
   pDecoder->SetOption (DECODER_OPTION_NUM_OF_THREADS, &iThreadCount);

   if (pDecoder->Initialize (&sDecParam)) {

• Download https://download.blender.org/peach/bigbuckbunny_movies/big_buck_bunny_1080p_h264.mov
• Convert .mov to .264 (You can use ffmepg like ffmpeg -i big_buck_bunny_1080p_h264.mov -c:v copy big_buck_bunny_1080p_h264.264).
• Run h246dec big_buck_bunny_1080p_h264.264 big_buck_bunny_1080p_h264.yuv