Signed-off-by: yangshuai<yangshuai67@huawei.com>

zh-cn/application-dev/media/opensles-playback.md

+# OpenSLES音频播放开发指导
+
+ 
+
+## 场景介绍
+
+OpenSL ES™ 是无授权费、跨平台、针对嵌入式系统精心优化的硬件音频加速API。 
+
+ 
+
+## 开发步骤
+
+以下步骤描述了在**openHarmony**如何使用 **OpenSLES** 开发音频播放功能：
+
+1. 使用 **slCreateEngine** 接口和获取 **engine** 实例。
+
+    ```c++
+    SLObjectItf engineObject = nullptr;
+    slCreateEngine(&engineObject, 0, nullptr, 0, nullptr, nullptr);
+    (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
+    ```
+
+    
+
+2. 获取接口 **SL_IID_ENGINE** 的 **engineEngine** 实例
+
+    ```c++
+    SLEngineItf engineEngine = nullptr;
+    (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineEngine);
+    ```
+
+    
+
+3. 配置播放器信息，创建 **AudioPlayer** 。
+
+    ```c++
+    SLDataLocator_BufferQueue slBufferQueue = {
+        SL_DATALOCATOR_BUFFERQUEUE,
+        0
+    };
+    
+    //具体参数需要根据音频文件格式进行适配
+    SLDataFormat_PCM pcmFormat = {
+        SL_DATAFORMAT_PCM,
+        2,
+        48000,
+        16,
+        0,
+        0,
+        0
+    };
+    SLDataSource slSource = {&slBufferQueue, &pcmFormat};
+    
+    SLObjectItf pcmPlayerObject = nullptr;
+    (*engineEngine)->CreateAudioPlayer(engineEngine, &pcmPlayerObject, &slSource, null, 0, nullptr, nullptr);
+    (*pcmPlayerObject)->Realize(pcmPlayerObject, SL_BOOLEAN_FALSE);
+    ```
+
+    
+
+4. 获取接口 **SL_IID_OH_BUFFERQUEUE** 的 **bufferQueueItf** 实例
+
+    ```
+    SLOHBufferQueueItf bufferQueueItf;
+    (*pcmPlayerObject)->GetInterface(pcmPlayerObject, SL_IID_OH_BUFFERQUEUE, &bufferQueueItf);
+    ```
+
+    
+
+5. 打开音频文件，注册 **BuqqerQueueCallback** 回调
+
+    ```c++
+    FILE *wavFile_ = nullptr;
+    
+    static void BuqqerQueueCallback (SLOHBufferQueueItf bufferQueueItf, void *pContext, SLuint32 size)
+    {
+        FILE *wavFile = (FILE *)pContext;
+        if (!feof(wavFile)) {
+            SLuint8 *buffer = nullptr;
+            SLuint32 pSize = 0;
+            (*bufferQueueItf)->GetBuffer(bufferQueueItf, &buffer, pSize);
+            //从文件读取数据
+            fread(buffer, 1, size, wavFile);
+            (*bufferQueueItf)->Enqueue(bufferQueueItf, buffer, size);
+        }
+        return;
+    }
+    
+    //wavFile_ 需要设置为用户想要播放的文件描述符
+    wavFile_ = fopen(path, "rb");
+    (*bufferQueueItf)->RegisterCallback(bufferQueueItf, BuqqerQueueCallback, wavFile_);
+    ```
+
+    
+
+6. 获取接口 **SL_PLAYSTATE_PLAYING** 的 **playItf** 实例，开始播放
+
+    ```c++
+    SLPlayItf playItf = nullptr;
+    (*pcmPlayerObject)->GetInterface(pcmPlayerObject, SL_IID_PLAY, &playItf);
+    (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_PLAYING);
+    ```
+
+    
+
+7. 结束音频播放
+
+    ```c++
+    (*playItf)->SetPlayState(playItf, SL_PLAYSTATE_STOPPED);
+    (*pcmPlayerObject)->Destroy(pcmPlayerObject);
+    (*engineObject)->Destroy(engineObject);
+    ```
+
+    
+
+ [**OpenSLES** 音频播放代码 demo](https://gitee.com/openharmony/multimedia_audio_standard/blob/master/services/test/audio_opensles_test.cpp)
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