diff --git a/design/histreamer_avcodec_process_analysis.md b/design/histreamer_avcodec_process_analysis.md
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+## 音视频编解码流程分析
+### 背景
+在测试mp3音频文件循环播放时，发现一段时间之后，会在某一次播放结束后卡住，无法继续下一次循环;
+问题定位流程参考如下issue：
+https://gitee.com/openharmony/multimedia_histreamer/issues/I7A8OT?from=project-issue
+
+DemuxerFilter读取数据并解封装后，将数据push到DecoderFilter；异步模式的DecoderFilter会开启三个线程来处理数据：
+1. HandleFrame线程：获取待解码数据并送入解码插件进行解码；
+2. DecodeFrame线程：分配输出buffer并读取解码后的数据；
+3. FinishFrame线程：将解码后的数据送入下一个filter节点；
+### 音频解码处理中各线程调用时序如下：
+```plantuml
+participant DemuxerFilter
+participant DecoderFilter_AsyncMode
+participant DecoderPlugin
+participant FfmpegAPI
+participant AudioSinkFilter
+participant AudioSinkPlugin
+
+alt#Gold DemuxerLoop 线程
+DemuxerFilter -> DemuxerFilter: ReadFrame()
+DemuxerFilter -> DecoderFilter_AsyncMode: HandleFrame() -> PushData() 
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: inBufQue_->Push(buffer)
+end
+alt#Gold #LightBlue HandleFrame 线程
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: inBufQue_->Pop()
+activate DecoderFilter_AsyncMode
+DecoderFilter_AsyncMode -> DecoderPlugin: ret = plugin_->QueueInputBuffer()\n
+DecoderPlugin -> FfmpegAPI: ret = avcodec_send_packet()\n @return AVERROR(EAGAIN)\ninput is not accepted in the current state\n user must read output with avcodec_receive_frame()
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: if (ret == ERROR_AGAIN) cv_.Wait()\n else continue
+deactivate
+end
+alt#Gold #Pink DecodeFrame 线程
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: outBufPool_->AllocateBuffer()
+activate DecoderFilter_AsyncMode
+DecoderFilter_AsyncMode -> DecoderPlugin: ret = plugin_->QueueOutputBuffer()
+DecoderPlugin -> FfmpegAPI: ret = avcodec_receive_frame()\n @return AVERROR(EAGAIN)\n output is not available in this state\n user must try to send new input
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: if (ret == AVERROR(EAGAIN))\n log no enough data\n//Here need call cv_.NotifyOne() but not
+deactivate
+DecoderPlugin -> DecoderFilter_AsyncMode: else CallBack outBufQue_.push()\n cv_.NotifyOne()
+end
+alt#Gold FinishFrame 线程
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: outBufQue_.pop()
+activate DecoderFilter_AsyncMode
+DecoderFilter_AsyncMode -> AudioSinkFilter: oPort->PushData(buffer)
+AudioSinkFilter -> AudioSinkPlugin: plugin_->Write(buffer)
+AudioSinkFilter -> AudioSinkPlugin: if buffer EOS plugin_->Drain()
+AudioSinkFilter -> AudioSinkFilter: CallBack to hiplayer_engine\n EVENT_COMPLETE
+AudioSinkFilter -> DecoderFilter_AsyncMode: release buffer
+deactivate
+end
+```
+
+### 循环播放时序图
+播放结束后，回调 EVENT_COMPLETE 事件到 histreamer 引擎，histreamer引擎继续回调 INFO_TYPE_EOS 事件到上层 PlayerServer，上层收到事件后，调用 Seek(0) 重新开始播放。
+```plantuml
+participant AudioSinkFilter
+participant HiPlayerImpl
+participant PlayerServer
+
+AudioSinkFilter -> AudioSinkFilter: if (buffer->flag = EOS)
+AudioSinkFilter -> HiPlayerImpl: CallBack OnEvent(EVENT_COMPLETE)
+HiPlayerImpl -> PlayerServer: CallBack OnInfo(INFO_TYPE_EOS)
+PlayerServer -> HiPlayerImpl: Seek(0)
+```
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diff --git "a/\351\227\256\351\242\230\345\256\232\344\275\215\346\241\210\344\276\213/20230602_\346\227\240\346\263\225\351\225\277\346\227\266\351\227\264\345\215\225\346\233\262\345\276\252\347\216\257\347\232\204\351\227\256\351\242\230/\351\225\277\346\227\266\351\227\264\345\215\225\346\233\262\345\276\252\347\216\257\346\222\255\346\224\276\345\244\261\350\264\245\345\210\206\346\236\220.md" "b/\351\227\256\351\242\230\345\256\232\344\275\215\346\241\210\344\276\213/20230602_\346\227\240\346\263\225\351\225\277\346\227\266\351\227\264\345\215\225\346\233\262\345\276\252\347\216\257\347\232\204\351\227\256\351\242\230/\351\225\277\346\227\266\351\227\264\345\215\225\346\233\262\345\276\252\347\216\257\346\222\255\346\224\276\345\244\261\350\264\245\345\210\206\346\236\220.md"
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@@ -0,0 +1,65 @@
+## 音视频编解码流程分析
+### 背景
+在测试mp3音频文件循环播放时，发现一段时间之后，会在某一次播放结束后卡住，无法继续下一次循环;
+问题定位流程参考如下issue：
+https://gitee.com/openharmony/multimedia_histreamer/issues/I7A8OT?from=project-issue
+
+DemuxerFilter读取数据并解封装后，将数据push到DecoderFilter；异步模式的DecoderFilter会开启三个线程来处理数据：
+1. HandleFrame线程：获取待解码数据并送入解码插件进行解码；
+2. DecodeFrame线程：分配输出buffer并读取解码后的数据；
+3. FinishFrame线程：将解码后的数据送入下一个filter节点；
+### 音频解码处理中各线程调用时序如下：
+```plantuml
+participant DemuxerFilter
+participant DecoderFilter_AsyncMode
+participant DecoderPlugin
+participant FfmpegAPI
+participant AudioSinkFilter
+participant AudioSinkPlugin
+
+alt#Gold DemuxerLoop 线程
+DemuxerFilter -> DemuxerFilter: ReadFrame()
+DemuxerFilter -> DecoderFilter_AsyncMode: HandleFrame() -> PushData() 
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: inBufQue_->Push(buffer)
+end
+alt#Gold #LightBlue HandleFrame 线程
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: inBufQue_->Pop()
+activate DecoderFilter_AsyncMode
+DecoderFilter_AsyncMode -> DecoderPlugin: ret = plugin_->QueueInputBuffer()\n
+DecoderPlugin -> FfmpegAPI: ret = avcodec_send_packet()\n @return AVERROR(EAGAIN)\ninput is not accepted in the current state\n user must read output with avcodec_receive_frame()
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: if (ret == ERROR_AGAIN) cv_.Wait()\n else continue
+deactivate
+end
+alt#Gold #Pink DecodeFrame 线程
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: outBufPool_->AllocateBuffer()
+activate DecoderFilter_AsyncMode
+DecoderFilter_AsyncMode -> DecoderPlugin: ret = plugin_->QueueOutputBuffer()
+DecoderPlugin -> FfmpegAPI: ret = avcodec_receive_frame()\n @return AVERROR(EAGAIN)\n output is not available in this state\n user must try to send new input
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: if (ret == AVERROR(EAGAIN))\n log no enough data\n//Here need call cv_.NotifyOne() but not
+deactivate
+DecoderPlugin -> DecoderFilter_AsyncMode: else CallBack outBufQue_.push()\n cv_.NotifyOne()
+end
+alt#Gold FinishFrame 线程
+DecoderFilter_AsyncMode -> DecoderFilter_AsyncMode: outBufQue_.pop()
+activate DecoderFilter_AsyncMode
+DecoderFilter_AsyncMode -> AudioSinkFilter: oPort->PushData(buffer)
+AudioSinkFilter -> AudioSinkPlugin: plugin_->Write(buffer)
+AudioSinkFilter -> AudioSinkPlugin: if buffer EOS plugin_->Drain()
+AudioSinkFilter -> AudioSinkFilter: CallBack to hiplayer_engine\n EVENT_COMPLETE
+AudioSinkFilter -> DecoderFilter_AsyncMode: release buffer
+deactivate
+end
+```
+
+### 循环播放时序图
+播放结束后，回调 EVENT_COMPLETE 事件到 histreamer 引擎，histreamer引擎继续回调 INFO_TYPE_EOS 事件到上层 PlayerServer，上层收到事件后，调用 Seek(0) 重新开始播放。
+```plantuml
+participant AudioSinkFilter
+participant HiPlayerImpl
+participant PlayerServer
+
+AudioSinkFilter -> AudioSinkFilter: if (buffer->flag = EOS)
+AudioSinkFilter -> HiPlayerImpl: CallBack OnEvent(EVENT_COMPLETE)
+HiPlayerImpl -> PlayerServer: CallBack OnInfo(INFO_TYPE_EOS)
+PlayerServer -> HiPlayerImpl: Seek(0)
+```
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