MTK 平台HAL层将单声道数据搬移至另一个声道

最新推荐文章于 2022-09-04 14:27:31 发布

原创最新推荐文章于 2022-09-04 14:27:31 发布 · 1.7k 阅读

CC 4.0 BY-SA版权

本文介绍了一段针对AudioALSACaptureDataClient类中的CheckNeedDataConvert方法进行的数据转换代码。主要内容包括根据不同的条件判断是否需要将单声道数据转换为立体声数据，以及如何进行数据转换的具体实现。

AudioALSACaptureDataClient::CheckNeedDataConvert 中加入以下代码

  if( factory_test_mode != true )
+    {
+           if (mStreamAttributeTarget->BesRecord_Info.besrecord_enable == true)
+           {
+               //need return stereo data
+              if (num_channel == 2)
+               {
+                  if (!mBesRecordStereoMode) //speech enhancement output data is mono, need to convert to stereo
+                   {
+                       short left;
+                       short right;
+                       int copysize = bytes >> 2;
+
+                       while (copysize)    //only left channel data is processed
+                       {
+                           left = *(buffer);
+                           *(buffer) = left;
+                           *(buffer + 1) = left;
+                           buffer += 2;
+                           copysize--; 
+                       } 
+                   }
+               }
+           }
     }
+    else
+       {
+               
+        short right;
+        int copysize = bytes >> 2;
+
+        while (copysize)    //only left channel data is processed
+        {
+                       right = *(buffer+1);
+            *(buffer) = right;
+            *(buffer + 1) = right;
+            buffer += 2;
+            copysize--;
+           
+        }
+               
+       }
+

+

+        while (copysize)    //only left channel data is processed

+        {

+                       right = *(buffer+1);

+            *(buffer) = right;

+            *(buffer + 1) = right;

+            buffer += 2;

+            copysize--;

+

+        }

+

+       }

+