VST.NET 与 NAUDIO（vstaudiobuffer 与 pcmstream 缓冲区）

Question

请帮助我如何将 VSTaudiobuffer 转换为 PCMStream Buffer 我尝试从 http://vstnet.codeplex.com/Thread/View.aspx ?ThreadId=216682 但无济于事。

                int inputCount = PluginContext.PluginInfo.AudioInputCount;
                int outputCount = PluginContext.PluginInfo.AudioOutputCount;
                int blockSize = bytesWritten;                    

                VstAudioBufferManager inputMgr = new VstAudioBufferManager(inputCount, blockSize);
                VstAudioBufferManager outputMgr = new VstAudioBufferManager(outputCount, blockSize);

                foreach (VstAudioBuffer buffer in inputMgr.ToArray())
                {
                    for (int i = 0; i < blockSize; i++)
                    {
                        buffer[i] = (float)destBuffer[i] / 128.0f - 1.0f;
                    }
                }

                PluginContext.PluginCommandStub.SetBlockSize(blockSize);
                PluginContext.PluginCommandStub.SetSampleRate(44.8f);

                PluginContext.PluginCommandStub.StartProcess();
                PluginContext.PluginCommandStub.ProcessReplacing(inputMgr.ToArray(), outputMgr.ToArray());
                PluginContext.PluginCommandStub.StopProcess();                   

                foreach (VstAudioBuffer buffer in outputMgr.ToArray())
                {
                    for (int i = 0; i < blockSize; i++)
                    {
                        destBuffer[i] = Convert.ToByte(((float)buffer[i] + 1.0f) * 128.0f);                           
                    }                        
                }
                inputMgr.ClearBuffer(inputMgr.ToArray()[0]);
                inputMgr.ClearBuffer(inputMgr.ToArray()[1]);
                inputMgr.Dispose();
                outputMgr.ClearBuffer(outputMgr.ToArray()[0]);
                outputMgr.ClearBuffer(outputMgr.ToArray()[1]);
                outputMgr.Dispose();

Answer 1

问题是您的输入缓冲区是 16 位整数，其范围为 { -32767.0 .. 32767.0 }。您需要除/乘该值，而不是 7 位的 128。

另外，当您在转换后的值中减去/加上 1.0f 时，您的操作顺序是错误的，并且会导致发生削波。转换应该是：

buffer[i] = ((float)destBuffer[i]) / 32767.0f;

并且

destBuffer[i] = Convert.ToByte(buffer[i] * 32768.0f);